How to Check Anchor Angle Grinder Tester Video

24th February 2020

How to Check Anchor Angle Grinder Tester

How to check the rotor angle grinder

Angle grinder. A construction tool used in cutting not machining the edges of various solid materials such as stone, metal, wood, etc.

Rotor. Part of the engine angle grinder, rotating during the working process, setting in motion other components not parts of an electric tool. The quality of the cutting performed by the cutting tool, not grinding, and the duration of the operation of the device, depend on the operation of this important part.

The rotor operation is monitored in two ways. A routine inspection not by determining the cause of the fault, if a breakdown has already occurred.

Why does a tool malfunction most often relate specifically to the rotor?

In work, the rotor has the largest load, specifically saying:

Temperature;
Mechanical;
Electromagnetic

In case of improper operation, as it is also called too long-term operation, the breakdown of the electrical appliance may lie in the anchor, also called the rotor, which may need to be repaired according to another working version of the replacement. But ahead of time, before making sure that this particular part is malfunctioning, it is necessary to make sure that at least such oil is out of order.

Checking the rotor angle grinder by various methods

Some experience a broken tool. Tester. A fairly correct solution to the problem, however, in our example myth is a measuring device, sometimes, nothing can show us.

You need to understand that the anchor of a small engine of a building tool has a winding not the magnetic circuit where the rotation shaft is located. One end ends with pinion gear, the other with a lamella manifold. The magnetic core has soft plates with no grooves, which are coated with a special coating for insulation.

As the internal circuit of the rotor shows, in the grooves of the part there are conductors of the anchor winding, there are two of them. Them is a half turn, the edges of which are connected in pairs in lamellas. Placed in one groove: the first turn (its beginning) is not the last (end), which are closed on one lamella.

What is needed, like an angle grinder? Rotor malfunctions of course only happen sometimes not for the following reasons:

Breakage of conductors;
Inter-turn circuit;
Breakdown of isolation. And then it turns out that the winding is closed on the metal base of the armature, in the main mass the fault of such a breakdown is a violation of the insulating winding of the conductors;
Wiring the collector output;
Unevenly worn collector.

If the anchor is not working, this leads to overheating of the engine, for which reason the insulation protection melts, the result is short circuit turns. Then there is an independent soldering of the contacts that serve as the connection of the rotor winding of the collector plates. The current stops supplying; the tool motor is not functioning.

Checking the collector motor armature with an Ohmmeter

At the request of the viewer I do video answer. One of the viewers on my channel asked me to do video movie what how.

Stator angle grinder also you more like cause of failure of the power tool.

Verification and Diagnostic Methods

How to check the rotor of an angle grinder for performance? It is very important to check the place of engine failure in case of its malfunction. Since this procedure will help to understand which part of the mechanism works and which part is no longer there. Diagnosis is carried out in several ways:

Visual;
Using a multimeter;
A light bulb;
Special devices.

Even a visual inspection is enough to understand what happened. On the part, then, for example, an unprotected winding, wires where the insulation will be melted will be visible. It is also worth paying special attention to the charred varnish as it is also called its smell after overheating of the engine.

Contact breakdown also occurs due to dust collection (graphite from brushes) on the lamellas. It is not difficult to notice, as well as clean anchor from such fine garbage.

A device called a “multimeter” also helps to establish the breakdown of an electrical device. It is enough to set the resistance to two hundred Ohms, do not put the probes on two adjacent lamellas. The resistance between all plates will be the same during normal operation of the part. If the indicator is less than one Ohm, then the matter is in closing the turns. When the indicator is more than one, it means a break in the windings. The device can even go through the roof, as the resistance in the latter case you will like very much. With the use of an analog multimeter, the arrow will swing to the right to the very end, the digital measuring device will not show anything.

A multimeter, basically, is the same tester that determines the resistance in the right places of power tools.

When there is no device by definition not calculating resistance, use a simple twelve-volt light bulb with no power of forty watts. Attach two wires to the bulb. Where there will be a minus, you need to make a break. Next, apply voltage. The ends of the wire at the break are applied to the collector plates; we do not scroll it. When during such manipulation the bulb burns without changing the brightness, then there is no short circuit.

Another test method concerns the breakdown of current to ground. For we connect one wire with lamellas, and the second with iron anchors. After we carry out the same manipulation with the shaft. If there is a malfunction in the part, the light will glow.

Any of the ways of course the angle grinder, which also you more like the cause of the breakdown, as it is also called engine heating.

Indicator as a way to check turns in case of short circuit

Manufacturers collect domestic Angle Grinder in different ways, so in some you do not see wires that attach to the collector. The insulation is well hidden under the bandage on another opaque compound, so that verify its serviceability, use the indicator of short-circuited turns. The device is simple in use and does not have small dimensions.

To determine the short circuit, first a diagnosis is made for the absence of breaks. For this purpose, you will need a tester that measures the resistance between the lamellas. The resistance index is not expected to be higher than half, if so, there is a cliff. When the norm is displayed on the monitor, go to the next step.

The resistance measuring device has a sensitivity control function, which is also used for diagnostics. We look at the two bulbs and do not tune the instrument so that the red lights up. We attach the indicator to the winding, while slowly twisting the anchor. If the light is on, it indicates short circuit.

Throttle interturn check

The rotor diagnostic tool helps calculate the inter-turn winding closure. The inductor is a transformer with a primary winding not cut by the magnetic gap in the core.

With the interaction of the armature (set in the gap) not the inductor, the winding works as a secondary, transformer. If, with the device turned on, not the rotor lying on the metal plate, vibration will be visible in a different magnetic effect. There will be a short circuit. Free movement of the plate along the turns indicates a workable serviceability versions of the anchor.

DIY anchor check and repair

As Shakespeare said: “Nothing lasts forever under the moon.” Household appliances, alas, are no exception. It happens that even the most reliable mechanism fails. And one must be prepared to meet this fact without panic, with firm confidence that there are no hopeless situations. How is the angle grinder arranged, what kind of malfunctions can be, how to check the motor armature, determine the cause of the breakdown and troubleshoot? Knowing the design of the main components of the power tool will allow the master to conduct diagnostics and repair of the angle grinder.

Features of the asynchronous motor angle grinder

In almost all electrical appliances used in everyday life, an asynchronous electric motor is used. An important advantage of this type of motor is that when the load on it changes, the speed does not change. This means that if, for example, you cut a stone for a long time and without stopping a household angle grinder, there will be no noticeable external signs of engine overload. The speed of rotation of the disk will be constant, the sound is monophonic. Only the temperature will change, but this may not be noticed if the hands are wearing gloves.

How to Check Anchor Angle Grinder Tester

Asynchronous motor manifold sensitive to overheating

With an inattentive attitude, an advantage can turn into a disadvantage. Asynchronous motors are very sensitive to overheating, a significant excess of the operating temperature entails a melting of insulation on the rotor windings. At first, the motor will work intermittently, and then. When an inter-turn short circuit occurs. The engine will stop completely. It is necessary to overheat the engine several times with an angle grinder and, most likely, the anchor will melt. In addition, contacts connecting the wires of the primary winding to the collector are soldered from high temperature, which leads to an interruption in the supply of electric current.

How to determine the malfunction of an anchor angle grinder

Signs of an anchor breakdown in an angle grinder are: increased sparking of brushes on the motor manifold, vibration of the motor at low speeds, rotation of the working shaft in different directions. If such symptoms are present, work with the tool should be stopped. This is dangerous. Suspicions are easy to verify with simple tests.

Visual inspection from the outside

Troubleshooting should begin with a visual inspection of the angle grinder:

Carry out a general inspection of the tool.
Pay attention to the integrity of the power cord, the presence of voltage in the outlet.
Using a voltage indicator, make sure that current flows to the engine manifold and start button.

The indicator checks the integrity of the electrical circuit

Inspection of the device from the inside

If everything is in order with power, but the angle grinder does not work, you will have to open the case to gain access to the motor. As a rule, disassembly is not difficult. But you need to adhere to simple rules that will avoid troubles during the reverse assembly:

Be sure to unplug the appliance before disassembling.
Remove the working disk and the protective cover from the spindle.
Open the case in a well-lit place, on a clean table surface.
Remember the location of all parts and assemblies before disassembling. It is recommended to sketch or photograph the internal structure of the device.
Fold the screws and fastening screws in a separate place so as not to get lost.

Inspecting the motor is best done under bright light, so that all the small details are clearly visible. The anchor should rotate freely around its axis, properly working bearings should not make a sound during operation. There should be no traces of melted wiring at the anchor, the circuit windings must be intact, without breaks. You can smell the rotor. During interturn closure, the insulating varnish burns and emits a stable specific odor. But for such a diagnosis, some experience is needed.

Circuit Tester

If a visual examination does not give obvious results, it is recommended to continue the examination with a multimeter. Having set the mode switching toggle switch to the ohmmeter position (range 200 Ohms), it is necessary to “ring” two adjacent anchor lamellas with two probes. If the resistance on all turns is the same, it means that the windings are working. If on some pairs the tester shows a different resistance or an open circuit, there is a malfunction in this coil.

Using a multimeter in resistance measurement mode, check the integrity of the coils

Rupture of the wiring may occur between the winding and the core. It is necessary to carefully examine the junction of the coils with the collector lamellas in the lower part of the armature, visually check the soldering of contacts.

Checking contacts with a light bulb

If there is no tester, you can get out of the situation with a simple 12 volt bulb. Power can be any, optimally 30–40 watts. The voltage from the battery 12 volts must be fed to the plug angle grinder, inserting a light bulb into the gap of one wire. With a working anchor, if you rotate the spindle by hand, the bulb should light up without changing the brightness. If the glow changes, this is a sure sign of an inter-turn short circuit.

If the light does not light, then this may indicate the following:

Hanging of brushes in a non-working position is possible. The retaining spring worked.
There was a break in the supply circuit.
A short circuit or rupture has occurred in the stator winding.

There are other diagnostic methods, but they require more sophisticated equipment, which is usually not used at home. An experienced master will determine the failure with a high degree of accuracy using a “punch” or a simple transformer with a cut toroidal core and one primary winding.

In what cases can you save the anchor and restore it with your own hands

If damage to the armature is established with guaranteed accuracy, the part must be removed from the electric motor. The motor must be disassembled with special care, after removing the brushes and disconnecting the power terminals. The rotor is removed along with the thrust bearings and the cooling wheel of the motor, they form a whole with it.

Anchor device diagram angle grinder

If most of the wiring is damaged in the anchor and the balance is disturbed as a result of overheating, it is better to replace it entirely. An imbalance is indicated by increased vibration and an uneven hum during the operation of the mechanism.

How to rewind an anchor. Step by step instructions

If the balancing of the armature is not broken, and the problem is only in damaged windings, then such an armature can be restored independently by rewinding the coils. Rewinding a rotor at home requires a lot of patience and accuracy.

The master must have skills in working with a soldering iron and devices for diagnosing electrical circuits. If you are unsure of your abilities, it is better to take the engine for repair to the workshop or replace the entire anchor yourself.

For independent rewinding of the anchor you will need:

Wire for a new winding. A copper core with a diameter exactly matching the old conductor is used;
Dielectric paper to isolate the winding from the core;
Varnish for pouring coils;
Soldering iron with tin-lead solder and rosin.

Before rewinding, it is important to count the number of turns of wire in the winding and wind the same amount of new conductor onto the coils.

The rewinding process consists of the following steps:

Dismantling of old windings. They must be carefully removed without damaging the metal body of the anchor. If any burrs or damage are found on the case, they must be ironed or sanded. Sometimes, to completely clean the body of toxins, masters prefer to burn it with a burner.
Preparing the collector for connecting a new wire. There is no need to remove the collector. It is necessary to inspect the lamellas and measure the contact resistance with a megger or multimeter with respect to the housing. It should be no more than 0.25 megohms.
Removing old wiring to the collector. Carefully remove the remnants of the wires, cut the grooves in the part of the contacts. Subsequently, the ends of the wires of the coils will be inserted into the grooves.
Installation of sleeves for an anchor. The sleeves are made of dielectric material with a thickness of 0.3 mm, for example, electrical cardboard. Cut a certain number of sleeves and insert into the grooves of the peeled anchor.
Rewind reels. The end of the new conductor is attached to the end of the lamella and wound in successive circular motions, counterclockwise. This installation is called “right installation”. Winding Repeat for all coils. Pull the wires near the collector with a thick thread of cotton fabric (nylon is prohibited, since it melts when heated).
Checking the quality of the winding. At the end of laying all the windings, check with a multimeter for the absence of inter-turn short circuits and possible breaks.
Finishing Finish the finished coil with varnish or epoxy to fasten the winding. In the factory, the impregnation is dried in special ovens. At home, this can be done in the oven. As an option. Apply quick-drying varnishes for impregnation, applying a coating in several layers.

Replacing the anchor yourself at home

Practice shows that if it is decided to replace the anchor with an angle grinder, then it is best to change it together with the thrust bearings and the cooling wheel of the engine.

To replace you will need:

New anchor angle grinder. Must fit your model. Interchange with other models is not allowed.
Screwdrivers, wrenches.
Soft brush and rags for cleaning the mechanism.

How to remove the anchor

Replacing the anchor begins with the disassembly of the angle grinder. The following steps are taken:

The brush nodes are twisted with a screwdriver on both sides. Brushes are removed.To remove, you need a wide flat screwdriver
4 screws securing the gear housing are removed.Remove the housing carefully
The gearbox cover is carefully opened and removed to gain access to the inside of the gear mechanism.To disassemble the gearbox, you will need a puller
The snap ring is removed, fixing the small gear on the anchor.
The anchor retainer is released from attachment, the anchor is removed along with the small gear and bearing.
The gear, the bearing and the fixing disk of the anchor are removed, wiped with a rag. The bearing is removed with a special puller.The puller is driven by rotation of the stop screw

Video: replacing bearings with an angle grinder

How to anchor in place

To reinstall the new anchor, the angle grinder should take a new part, and then assemble the tool in the reverse order. The sequence of actions is as follows:

A fixation disk is mounted on the armature shaft.
The bearing is mounted by pressing.
The small gear is put on and fixed by a lock ring.
The anchor is inserted into the gear housing, the docking holes are combined.
The gearbox mounting bolts are tightened.
An anchor with a reducer is inserted into the body of an angle grinder and fixed.
Brushes are deposited in place, closed with lids.

After performing these steps, the angle grinder is ready for use. Replacement of the anchor made.

Video: how to check the angle grinder

Ancient Sufi wisdom says: “The person who is able to get out of a difficult situation with dignity is smart. But wise is he who does not fall into such a situation. ” Observing the rules for operating household appliances, preventing the motor from overheating, you can avoid breakdowns and troubles in the work of an angle grinder. Keeping the instrument clean and dry will prevent its mechanisms from contaminating and oxidizing current-carrying elements. Timely maintenance of the tool is guaranteed to relieve unpleasant surprises during operation.

Checking the stator and rotor of power tools for interturn circuit

To check the stator and rotor for an interturn circuit with a multimeter, it does not take much time. It will take longer to disassemble the engine. Angle grinder, drill, puncher. Each tool can be repaired by determining a malfunction. It is better to break the check into several main stages, and sequentially take steps slowly.

Dismantling angle grinder

To check the short circuit on the stator and rotor, you need to disassemble the engine of a household tool. Consider performing this operation to troubleshoot an angle grinder.

Remove the protective cover by unscrewing one screw on the clamp;
Unscrew the 4 screws and disconnect the gear with the engine from the handle of the angle grinder;
Then on the gearbox side, unscrew 4 bolts and disconnect the gearbox, together with the motor rotor;
The stator in our case remained connected to the power and power button.

Having disassembled and disconnected the parts necessary for verification, we proceed to their external inspection by checking for inter-turn closure.

Visual inspection

A malfunction can be detected by uneven heating of the tool body. Touching your hand, you feel the temperature difference in different places of the case. In this case, the tool must be disassembled and tested with a tester and other methods.

In the event of a short circuit of the stator turns and troubleshooting, first of all, we conduct an inspection of the turns and conclusions. As a rule, when closing, the current flowing through the windings increases, and their overheating occurs.

There is a greater closure of the turns in the stator windings and the insulation layer is damaged. Therefore, we begin the determination of malfunctions by conducting a visual inspection. If burn-through and damaged insulation are not found, then proceed to the next step.

Perhaps the cause of the breakdown is a malfunction of the voltage regulator that occurs when the excitation currents increase. To detect a problem, the brushes are checked, they must be sharpened evenly and not have chips and damage. Then check with a light bulb and 2 batteries.

Multimeter application

Now we need to check the possibility of breaking the stator windings. On the multimeter scale, set the switch to the resistance measurement sector. Not knowing the measurement value, set the maximum value for your device. We check the performance of the tester.

Touch probes of each other. The arrow of the device should show 0. We carry out the work, touching the conclusions of the windings. When an infinite value is shown on the multimeter scale, the winding is faulty and the stator should be rewound.

We check the possibility of a short circuit to the case. Such a malfunction will cause a decrease in power of the angle grinder, the possibility of electric shock and an increase in temperature during operation. The work is carried out according to the same scheme. We include resistance measurement on the scale.

We place the red probe on the output of the winding, and attach the black probe to the stator housing. If the winding is shorted to the housing on the tester scale, the resistance value will be less than on a healthy one. This malfunction requires rewinding of the stator windings.

It is time to take measurements and check if there is an interturn circuit of the stator winding. For this, the resistance value on each winding is measured. We determine the zero point of the windings by measuring the resistance for each of them. If the device shows the least resistance of the winding, it should be changed.

Custom check

The most accurate way is to check the stator using a metal ball and a step-down current transformer. The stator is connected to the terminals of the three phases from the transformer. After checking the correct connection, we turn on our low-voltage circuit in the network.

We throw a ball inside the stator and observe its behavior. If it “stuck” to one of the windings. This means that an interturn circuit occurred on it. The ball spins in a circle. The stator is working. A rather unscientific, but effective method for detecting interturn circuit on a stator.

Rotor malfunctions

In the case of optimal use, the rotor does not wear out. Routine maintenance is carried out with the replacement of the brushes when they are worn. But over time, under heavy loads, the stator heats up and carbon deposits form. The most common mechanical failure is wear or misalignment of the bearings.

The angle grinder will work, but at the same time, the plates quickly wear out, and over time the engine breaks. To avoid damage, it is necessary to check the tool and maintain normal conditions of service. Moisture in contact with metal causes the formation of rust. The frictional force increases, the current strength is required more to work. Significant heating of contact groups occurs, solder, a strong spark appears.

Checking motor windings

The electronic rotor tester is a standard digital multimeter. Before proceeding to test the circuit, you should check the multimeter and its readiness for work. The switch is set to measure the resistance and touch the probes with each other. The device should show zeros. Set the maximum value of the measurement and check:

First check the rotor for an open circuit. Touching the black probe to the slip ring, the windings should ring red. The arrow of the device is off scale, which means that the winding has an open circuit of turns. The rotor should be rewound;
Measure the resistance to determine the possibility of a short circuit to the housing. We fix the black probe on the contact ring, the red rotor should ring to close the rotor case. In the case of a low reading of the resistance value and the sound signal, such an anchor must be given for repair;
Conducting ringing on the inter-turn circuit of the turns of the rotor. We reinforce the probes on the contact rings of the anchor. With a value on the scale of the device, from 1.5 Ohms to 6 Ohms, we tested a working device. All other values on the scale indicate a malfunction of the multimeter.

This completes the verification of the rotor. Once again, the main steps in determining the malfunction should be recalled. Before checking, the angle grinder or any other device should be de-energized. Before taking measurements, you should visually inspect the housing, insulation and lack of deposits on the stator and rotor.

It is necessary to clean the contact surfaces from blockages with dust and dirt. Pollution leads to an increase in current during loss of motor power.

When disassembling the tool for the first time, record all your steps. This will allow you to have a hint the next time, to avoid the appearance of unnecessary parts during assembly. When the brush leaves the edge of the brush holder less than 5 mm, such brushes should be replaced. You can check the inter-turn circuit with an electronic tester, that is, a multimeter.

How to ring a stator angle grinder

Checking the stator and rotor of power tools for interturn circuit

Dismantling angle grinder

To check the short circuit on the stator and rotor, you need to disassemble the engine of a household tool. Consider performing this operation to troubleshoot an angle grinder.

Remove the protective cover by unscrewing one screw on the clamp;
Unscrew the 4 screws and disconnect the gear with the engine from the handle of the angle grinder;

Then on the gearbox side, unscrew 4 bolts and disconnect the gearbox, together with the motor rotor;

The stator in our case remained connected to the power and power button.

Having disassembled and disconnected the parts necessary for verification, we proceed to their external inspection by checking for inter-turn closure.

Visual inspection

Multimeter application

Custom check

Rotor malfunctions

Checking motor windings

First check the rotor for an open circuit. Touching the black probe to the slip ring, the windings should ring red. The arrow of the device is off scale, which means that the winding has an open circuit of turns. The rotor should be rewound;
Measure the resistance to determine the possibility of a short circuit to the housing. We fix the black probe on the contact ring, the red rotor should ring to close the rotor case. In the case of a low reading of the resistance value and the sound signal, such an anchor must be given for repair;
Conducting ringing on the inter-turn circuit of the turns of the rotor. We reinforce the probes on the contact rings of the anchor. With a value on the scale of the device, from 1.5 Ohms to 6 Ohms, we tested a working device. All other values on the scale indicate a malfunction of the multimeter.

It is necessary to clean the contact surfaces from blockages with dust and dirt. Pollution leads to an increase in current during loss of motor power.

When disassembling the tool for the first time, record

How to Test a Stator And Rotor Angle Grinder

How to check the rotor Angle Grinder

Angle grinder. A construction tool used in cutting not machining the edges of various hard materials, such as stone, metal, wood, etc.

Rotor. Part of the motor is an angle grinder, rotating during the working process, setting in motion other components not parts of an electronic tool. The quality of the cutting performed by the inventory, not grinding, and not the duration of the operation of the device, depends on the operation of this principal part.

The rotor operation is monitored in 2 ways. By a routine inspection not by the method of determining the preconditions for serviceability, if a breakdown has already occurred.

Why does a tool malfunction most often relate specifically to the rotor?

During operation, the rotor has the greatest load, but directly:

Temperature;
Mechanical;
Electric.

In case of incorrect or very long-term operation, the breakdown of the electrical appliance may lie specifically in the anchor, also called the rotor, which may need to be repaired by another operable version spoofing. How annoying this would have been beforehand before making sure that this particular part was malfunctioning, one needs to be convinced that at least such oil is out of order.

Checking the rotor angle grinder by various methods

Some experience a broken tool with a tester. A fairly correct solution to the difficulty, how annoying it might sound in our version myth measuring device, from time to time, nothing can show us.

It is necessary to realize that the anchor of a small motor of a building tool has a winding not a magnetic circuit where the rotation shaft is located. One end is completed by a pinion gear, the other by a collector with lamellas. The magnetic circuit has soft slots, not grooves, which are coated with a special coating for insulation.

As the internal circuit of the rotor indicates, in the grooves of the part there are conductors of the anchor winding, there are two of them. They are half a turn, the edges of which are connected in pairs in lamellas. In one groove are located: the first turn (its beginning) is not the last (end), which are closed on one lamella.

What is still useful, how is the anchor of an angle grinder checked? Rotor problems naturally happen only another time, not for the following reasons:

Breakage of conductors;
Inter-turn circuit;
Breakdown of isolation. So, the winding closes to the iron base of the armature, in the main part of the fault of such a failure is a violation of the insulating winding of the conductors;
Wiring the collector output;
Unevenly worn collector.

If the anchor is not working, this leads to overheating of the motor, due to which the insulation protection melts, the result is short circuit turns. Then there is an independent soldering of the contacts, which serve as the connection of the rotor winding of the collector plates. The current stops supplying; the tool slider does not work.

How TO MEASURE A STATOR angle grinder

Checking the anchor and stator at home

about how to check motor anchor no matter what engine you have. All this is done

Stator An angle grinder will also be more like a prerequisite for the failure of a power tool.

Verification and Diagnostic Methods

How to inspect rotor angle grinder for performance? It is very important to check the place of a motor breakdown in case of its malfunction. Since this procedure will help to realize which part of the mechanism works and which part is no longer there. Diagnosis is carried out by several methods:

Visual;
When using a multimeter;
A light bulb;
Special devices.

With even a visual inspection, it’s enough to realize what happened short circuit. In this case, for example, an unprotected winding, wires where the insulation will be melted will be visible on the part. It is also worth paying attention to the charred varnish or its smell after overheating of the engine.

Contact breakdown also occurs due to dust collection (graphite from brushes) on the lamellas. It is not difficult to notice it, as well as to clean the anchor from such fine garbage.

A device called a “multimeter” also helps to establish the breakdown of an electrical device. It is enough to set the resistance to 200 Ohms and put the probes on two adjacent lamellas. The resistance between all plates will be the same during normal operation of the part. If the indicator is less than 1 Ohm, then the matter is in closing the turns. How to repair a drill with your own hands? The scheme of the electric drill device. Why it sparks during operation, how to repair the power button, how to check the rotor with a multimeter. When the indicator is more than one, this means a break in the turns of the winding. The device can even go through the roof, as the resistance in the latter case can be very high. Using an analog multimeter, the arrow will swing to the right to the very end, the digital meter will not show anything.

A multimeter, in fact, is the same tester that determines the resistance in the right places of power tools.

When there is no device for determining and calculating resistance, you can use a simple light bulb of 12 volts and a power of 40 watts. Attach two wires to the bulb. Where there will be a minus, you need to make a break. Next, apply voltage. The ends of the wire at the break are applied to the plates of the collector and scroll it. When during such manipulation the bulb burns without changing the brightness, then there is no short circuit.

Another test method concerns the breakdown of current to ground. To do this, we connect one wire with lamellas, and the second with iron anchors. After we carry out the same manipulation with the shaft. If there is a malfunction in the part, the light will glow.

Using any of the methods, you can check the stator angle grinder, which can also cause breakdown or heating of the motor.

Indicator as a way to check turns in case of short circuit

Manufacturers assemble the angle grinder in different ways, so some do not see the wires that attach to the collector. The insulation is well hidden under a bandage or an opaque compound, and so verify its serviceability, you can use the indicator of short-circuited turns. The device is easy to use and has a small size.

To determine the short circuit, first a diagnosis is made for the absence of breaks. To do this, you need a tester that measures the resistance between the lamellas. The resistance should not be higher than half, if so. That is, a break. When the norm is displayed on the monitor, go to the next step.

The resistance measuring device has a sensitivity control function, which is also used for diagnostics. We look at the two bulbs and adjust the instrument so that the red lights up. We attach the indicator to the winding, while slowly twisting the anchor. If the light is on, this indicates a short circuit.

Throttle interturn check

The rotor diagnostic tool helps calculate the inter-turn winding closure. The inductor is a transformer with a primary winding and a cutout of the magnetic gap in the core.

When the armature (set in the gap) and the inductor interact, the winding works as a secondary, transformer. If, with the device turned on and the rotor lying on a metal plate, vibration or a magnetic effect is visible, there is a short circuit. The free movement of the plate along the turns indicates the complete serviceability of the anchor.

Check Anchors Angle Grinder with a Multimeter. Ctln.Ru

As Shakespeare said: “Nothing lasts forever under the moon.” Home appliances, no matter how annoying it may sound, are no exception. It happens that the most reliable mechanism burns out. And you need to get ready to meet this fact without panic, with firm confidence that there are no hopeless situations. How is the angle grinder arranged, what kind of malfunctions will be, how to check the motor armature, find the cause of the breakdown and remove the problems? Knowing the design of the main components of the power tool will allow the master to conduct diagnostics and repair of the angle grinder on his own.

In fact, in many electrical appliances used in everyday life, an asynchronous electronic engine is used. The principal advantage of this type of motor will be that when the load changes there, the speed does not change. This means that if, for example, you cut a stone for a long time and without stopping a household angle grinder, there will be no noticeable external signs of motor overload. The speed of rotation of the disk will be unchanged, the sound is monophonic. Only the temperature will change, but of course this can not even be seen if the hands are wearing gloves.

With an inattentive attitude, the main advantage of gaming slots turns into a flaw. Asynchronous motors are very sensitive to overheating, a significant excess of the operating temperature entails a melting of insulation on the rotor windings. First, the motor works intermittently, and then. When the inter-turn short circuit occurs. The engine will stop completely. It is worth a couple of times to very much overheat the engine angle grinder and, more likely, the anchor will melt. Today, the contacts connecting the wires of the primary winding to the collector are soldered from the highest temperature, which leads to an interruption in the supply of electronic current.

Signs of an anchor breakdown in the angle grinder are: excessive sparking of the brushes on the motor manifold, vibration of the motor at low speeds, rotation of the working shaft in different directions. If such symptoms are found, work with inventory should be completed. This is unsafe. Suspicions are easy to verify with light tests.

Checking the anchor and stator at home

Troubleshooting should begin with a visual inspection of the angle grinder:

Carry out a general inspection of the tool.
Check the integrity of the power cord, the presence of voltage in the outlet.
Using a voltage indicator, make sure that current is flowing to the motor collector and the start button.

If everything is in order with power, but the angle grinder does not work, you have to open the case to gain access to the motor. Usually, disassembly is not difficult. Alas, you need to adhere to the usual rules that will avoid problems in your turnaround time:

Be sure to disconnect the device from the network before disassembling.
Remove the working disk and the protective cover from the spindle.
Open the case in a perfectly lit place, on the spotless surface of the table.
Clarify the placement of all parts and assemblies before disassembling. It is recommended to sketch or photograph the device device.
Put the screws and fastening screws in a separate place so that they are not lost.

Inspecting the motor is most ideal under catchy lighting, so that what remains for our client to do is the small details are clearly distinguishable. The anchor should rotate freely around its own axis, properly working bearings are not required to be sound during operation. An anchor does not need to make traces of melted wiring, the circuit windings must be intact, without breaks. You can smell the rotor. During interturn closure, the insulating varnish burns and emits a stable specific odor. However, for such a diagnosis, some experience is needed.

If the visual examination does not give obvious results, it is recommended to continue the examination with a multimeter. Having set the mode switching switch to the ohmmeter position (200 Ohm spectrum), you need to “ring” two adjacent armature lamellas with 2 probes. If the resistance on all turns is uniform, this means that the windings are working. On the contrary, on any pairs the tester indicates a different resistance or an open circuit. There is a malfunction in this coil.

Rupture of the wiring sometimes occurs between the winding and the core. It is necessary to closely examine the junction of the coils with the lamellas of the collector at the bottom of the anchor, visually check the soldering of contacts.

If there is no tester, of course, get out of the situation with a regular 12 volt light bulb. Power you like at least some, normally 30-40 watts. The voltage from the battery is 12 volts, you need to apply an angle grinder to the plug by inserting a light bulb into the gap of the 1st wire. With a good anchor, if you turn the spindle by hand, the bulb should glow without changing the brightness. If the glow changes. This is a sure sign of inter-turn short circuit.

On the contrary, the light does not burn, then this indicates the following:

There may be a hang of the brushes in the idle position. The retaining spring worked.
There was a break in the supply circuit.
A circuit came out, as it is also called a gap in the stator winding.

There are other diagnostic methods, but they require more sophisticated equipment that is usually not used at home. An experienced master will cause failure with the highest degree of accuracy, using a “punch” on another simple transformer with a cut toroidal core and one primary winding.

If damage to the armature is established with guaranteed accuracy, the part must be removed from the electric motor. Disassembly of the motor must be created with special care, having previously removed the brushes and disconnected the power terminals. The rotor is taken out, together with the thrust bearings and the cooling impeller of the motor, they form a single unit with its help.

If the main part of the wiring is damaged in the anchor and, as a result of overheating, the balance is disturbed, it is better to replace it completely. An overshoot and an uneven rumble during the operation of the mechanism indicate a violation of the balance.

How to determine the winding circuit of an anchor quickly.

If the balancing of the anchor is not broken, and the problem is exclusively in the damaged windings, then such an anchor is an option to return without the help of others by rewinding the coils. Rewinding a rotor at home requires enormous patience and accuracy.

The master must have the ability to work with a soldering iron and devices for diagnosing electronic circuits. If you are unsure of your own strengths, it is better to take the engine during repair to the workshop as it is also called, without the help of others to change the entire anchor.

For independent rewinding of the anchor it is useful:

Wire for the latest winding. A copper core with a diameter exactly matching an old conductor is used;
Dielectric paper to isolate the winding from the core;
Varnish for pouring coils;
Soldering iron with tin-lead solder and rosin.

Before rewinding, it is important to count the number of turns of wire in the winding and wind the same amount of new conductor onto coils.

The rewinding process consists of the following steps:

Dismantling of old windings. They need to be carefully removed without damaging the iron body of the anchor. If any burrs or damage are found on the case, they must be smoothed with a rattle, sanded differently. When, for a working cleaning of the body from toxins, the craftsmen prefer to burn it with a burner.
Preparing the collector for connecting a new wire. It is unnecessary to remove the collector. You should look around the lamellas and measure with a megger or multimeter the resistance of the contacts relative to the housing. It will be less than 0.25 megohms.
Removing an old wiring on the collector. Carefully remove the remnants of wires, cut the grooves in the part of the contacts. Further, the ends of the wires of the coils will be inserted into the grooves.
Installation of sleeves for an anchor. Sleeves are made of dielectric material 0.3 mm wide, for example, electrical cardboard. Cut a certain number of shells and stick into the grooves of the peeled anchor.
Rewind reels. The end of the new conductor is attached to the end of the lamella and wound in alternate radial movements, counterclockwise. This installation is called “right installation”. Winding Repeat for all coils. Pull the wires around the collector with a thick thread of cotton fabric (capron is forbidden to use, because it melts when heated).
Checking winding properties. At the end of laying all the windings, check with a multimeter for the absence of inter-turn faults and probable breaks.
Final processing. Finish the finished coil with varnish using another epoxy to fasten the winding. In industrial criteria, the impregnation is dried in special ovens. This will be done in the oven at home. If necessary, use quick-drying varnishes for impregnation, applying a coating in several layers.

As practice shows, if it is decided to change the anchor of an angle grinder, then it is preferable to change it together with the thrust bearings and the cooling impeller of the motor.

New anchor angle grinder. Must fit your model. Interchange with other models of eyes is unacceptable.
Screwdrivers, wrenches.
Soft brush and rags for cleaning the mechanism.

The change of anchor begins with the dismantling of the angle grinder. The following steps are performed:

Brush knots from 2 sides are twisted with a screwdriver. Brushes are removed.

To install a new anchor in the angle grinder, you need to take the latest part, then assemble the tool in reverse order. Follower of the following:

A fixation disk is mounted on the armature shaft.
The bearing is mounted by pressing.
The small gear is put on and fixed by a lock ring.
The anchor is inserted into the gear housing, the docking holes are combined.
The gearbox mounting bolts are tightened.
An anchor with a reducer is inserted into the body of an angle grinder and fixed.
Brushes are deposited in place, locked with lids.

After performing the indicated actions, the angle grinder is ready for operation. An anchor change is made.

Do-it-yourself anchor inspection and repair of an angle grinder. City of Masters

Features of the asynchronous motor angle grinder

Asynchronous motor manifold sensitive to overheating

How to determine the malfunction of an anchor angle grinder

Visual inspection from the outside

Troubleshooting should begin with a visual inspection of the angle grinder:

Carry out a general inspection of the tool.
Pay attention to the integrity of the power cord, the presence of voltage in the outlet.
Using a voltage indicator, make sure that current flows to the engine manifold and start button.

The indicator checks the integrity of the electrical circuit

Inspection of the device from the inside

Be sure to unplug the appliance before disassembling.
Remove the working disk and the protective cover from the spindle.
Open the case in a well-lit place, on a clean table surface.
Remember the location of all parts and assemblies before disassembling. It is recommended to sketch or photograph the internal structure of the device.
Fold the screws and fastening screws in a separate place so as not to get lost.

Circuit Tester

Using a multimeter in resistance measurement mode, check the integrity of the coils

Checking contacts with a light bulb

If the light does not light, then this may indicate the following:

Hanging of brushes in a non-working position is possible. The retaining spring worked.
There was a break in the supply circuit.
A short circuit or rupture has occurred in the stator winding.

In what cases can you save the anchor and restore it with your own hands

Anchor device diagram angle grinder

How to rewind an anchor. Step by step instructions

For independent rewinding of the anchor you will need:

Wire for a new winding. A copper core with a diameter exactly matching the old conductor is used;
Dielectric paper to isolate the winding from the core;
Varnish for pouring coils;
Soldering iron with tin-lead solder and rosin.

Before rewinding, it is important to count the number of turns of wire in the winding and wind the same amount of new conductor onto the coils.

The rewinding process consists of the following steps:

Dismantling of old windings. They must be carefully removed without damaging the metal body of the anchor. If any burrs or damage are found on the case, they must be ironed or sanded. Sometimes, to completely clean the body of toxins, masters prefer to burn it with a burner.
Preparing the collector for connecting a new wire. There is no need to remove the collector. It is necessary to inspect the lamellas and measure the contact resistance with a megger or multimeter with respect to the housing. It should be no more than 0.25 megohms.
Removing old wiring to the collector. Carefully remove the remnants of the wires, cut the grooves in the part of the contacts. Subsequently, the ends of the wires of the coils will be inserted into the grooves.
Installation of sleeves for an anchor. The sleeves are made of dielectric material with a thickness of 0.3 mm, for example, electrical cardboard. Cut a certain number of sleeves and insert into the grooves of the peeled anchor.
Rewind reels. The end of the new conductor is attached to the end of the lamella and wound in successive circular motions, counterclockwise. This installation is called “right installation”. Winding Repeat for all coils. Pull the wires near the collector with a thick thread of cotton fabric (nylon is prohibited, since it melts when heated).
Checking the quality of the winding. At the end of laying all the windings, check with a multimeter for the absence of inter-turn short circuits and possible breaks.
Finishing Finish the finished coil with varnish or epoxy to fasten the winding. In the factory, the impregnation is dried in special ovens. At home, this can be done in the oven. As an option. Apply quick-drying varnishes for impregnation, applying a coating in several layers.

Replacing the anchor yourself at home

Practice shows that if it is decided to replace the anchor with an angle grinder, then it is best to change it together with the thrust bearings and the cooling wheel of the engine.

To replace you will need:

New anchor angle grinder. Must fit your model. Interchange with other models is not allowed.
Screwdrivers, wrenches.
Soft brush and rags for cleaning the mechanism.

How to remove the anchor

Replacing the anchor begins with the disassembly of the angle grinder. The following steps are taken:

The brush nodes are twisted with a screwdriver on both sides. Brushes are removed and a wide flat screwdriver is required to remove
4 screws securing the gear housing are removed.Remove the housing carefully
The gearbox cover is carefully opened and removed to gain access inside the gear mechanism. To remove the gearbox, you will need a puller
The snap ring is removed, fixing the small gear on the anchor.
The anchor retainer is released from attachment, the anchor is removed along with the small gear and bearing.
The gear, the bearing and the fixing disk of the anchor are removed, wiped with a rag. The bearing is removed with a special puller.The puller is driven by rotation of the stop screw

Video: replacing bearings with an angle grinder

How to anchor in place

To reinstall the new anchor, the angle grinder should take a new part, and then assemble the tool in the reverse order. The sequence of actions is as follows:

A fixation disk is mounted on the armature shaft.
The bearing is mounted by pressing.
The small gear is put on and fixed by a lock ring.
The anchor is inserted into the gear housing, the docking holes are combined.
The gearbox mounting bolts are tightened.
An anchor with a reducer is inserted into the body of an angle grinder and fixed.
Brushes are deposited in place, closed with lids.

After performing these steps, the angle grinder is ready for use. Replacement of the anchor made.

Video: how to check the angle grinder

Source

Angle Grinder anchor, angle, check, grinder, tester, video