Winding of the anchor of the corner grinder with your own hands. How to check the anchor on a corner grinder?

Detailed scheme of the anchors on the corner grinder

The first two and a half “pancake”. lump. Began to wind along another (symmetrical, above scheme), considering. that there is a picture of unwinding the last coil, and the first should dangle in the opposite direction. Shook a wire from a swing loop. But, it was easy to dissolve with a loop, it was necessary to make a carousel and began to unravel to two coils). Well, and about two times the same turned out, then I decided to wind two.ended with two ends with two separate wires. In general, it is not clear what the brains were busy (patience and perseverance. never my virtues), but he wound the calves that. and in the number of turns in half.views and in grooves and even one lamel rolled up one lamel. Did not even plow the wires to the lamella, but immediately unwound. The second time I decided. that for the first rewinding of the anchor, you still need to start the simplest consistent winding. But even here it was not without incidents almost the same. In the second case, I decided to all the same without impregnation and connect. Checked with reduced nutrition through trance (36 V). Nothing spun.

cases as a transformer. Only the anchor was sticking to the stature. Changing the polarity of connecting brushes. also did not give anything. If we do not consider that when turning on in different positions of the rotor, it still turns to a certain angle, but at different positions. spins in different directions. I rewound the same wire (the places are exposed for wandering to the lamella was insulated with masking tape). I tried to be as attentive as possible, but I’m afraid. that it is not given to me. Although, I hope. what is as much as possible this time. I wrapped it everywhere not 15 turns of the half.look. And 14-16. But this time nothing was spun and even a change in the polarity of the brushes and the position of the anchor did not affect at all. Finally, I decided to play the position of brushes relative to the collector lamellas, in order to find out whether it was deaf or may not be the “ignition ahead” and the no shift and the direction of winding. Oddly enough. everything spun in the position of the vehicles of 80 degrees of the nominal position. Truth. it also spun in the reverse from the right side. Now the dilemma is to come up with how to fix the brushes in a working position or rewind with a new (or rather other) wire according to another scheme.(the one that was originally gathering. and not mirrateded (committed in this message).

Anchor device

The anchor of the corner grinder consists of a winding that conducts a current, and a magnetic circuit. In the magnetic circuit there is a shaft that steal. The design of the magnetic wire is formed with plates and grooves, which are insulated among themselves by coating varnish. A certain sequence of laying the anchor winding conductors in the grooves has been developed. The conductors form a turn. Its ending is binded on the lamella. The arrangement of the beginning of the starting round and the end of the latter is compiled in such a way that they are closed on one lamella.

With constant overheating of the angular grinder motor, the anchor is melted. As a result of high temperature, the contacts of the wires may disappear, which connect the primary winding to the collector. All this leads to the fact that the current is not supplied.

For what reason does a breakdown arise

Below are the most common reasons that, in one way or another, can lead to the failure of the stator:

• rupture of frosting as a result of overstrain;
• electrical closure of neighboring turns;
• partially burnt winding;
• Violation of insulation.

As a rule, there are several symptoms from the indicated list at once. There is also a failure of the equipment, with a significant increase in the load on the tool.

Any violation of the operational rules can technically lead to a breakdown of the tool. However, if the worst happened, this does not mean that you have to buy a new corner grinder.

After all, it is much cheaper to replace the electrical winding (or its burned.out part) and continue the operation of the equipment.

Ringing the stator winding “Corner grinder

3 hours ago, Arkadasyspb said: I somehow asked how to understand what, according to such a two.dimensional drawing, I did not understand

Thickness. the size of the groove itself, minus double isolation thickness (cardboard).

Did not change their minds to rewind when reading? Then we went on, specifically on the question. where, what ends to shove.

For more meticulous. It doesn’t matter where the beginning is, where the end is, the direction of winding and where. The principle is important. (in the second figure), if on the lower coil the end goes from the left to the left brush, then the end of the upper coil should be on the right, on the right brush. Asymmetric, not mirror.

The remaining two wires. actually the start of the coils, on the switch.

Changed June 7, 2021 user Falkon58

How to check the anchor of the corner grinder for serviceability

If the anchor is faulty, the engine overheating occurs, the insulation of the winding is melted, the turns are shortened shortly. Contacts connecting the anchor winding to the collector plates are soldered. The current supply stops and the engine stops working.

Standard diagnostics

Before you take the diagnostic device, inspect the anchor. It may be damaged. If the wiring is melted, the burnt insulation varnish will leave black traces or a specific smell. You can see bent and crumpled turns or conductive particles, for example, the remnants of the solder. These particles are the cause of a short circuit between turns. Lamels have bent edges called cocks to connect with the winding.

Due to violation of these contacts, the lamella is burned out.

Other damage to the collector: raised, worn or burnt plates. Graphite from brushes can accumulate between the lamels, which also indicates a short circuit.

How to repair anchor at home

A third of the screwdriver of the screwdriver occurs due to the anchor. With everyday intensive mode of operation, malfunctions can occur already in the first six months, for example, with untimely replacement of brushes. With sparing use, the screwdriver will last a year or more.

The anchor can be saved if the balancing is not broken. If during operation of the device an intermittent hum is heard and there is a strong vibration, then this is a violation of balancing. Such an anchor should be replaced. And you can repair the winding and the collector. Small short circuits are eliminated. If a significant part of the winding is damaged, it can be rewound. Worn and severely damaged lamellas to pave, build up or solder. In addition, you should not take on the repair of the anchor if you are uncertain in your capabilities. It is better to replace it or take it to the workshop.

Collector groove

Over time, the collector is formed from the brushes. To get rid of it, you need:

• Protect the collector using incisor cutting incisors, that is, passing incisors.
• We also need a reverse cone for centering in the bearing. Make a hole in it up to 8 mm.
• Since copper is viscous, adjust the machine to the number of revolutions from 600 to 1500 per minute.
• Primary supply of half the division. When the cutter slightly touches the product, make a longitudinal groove of the entire collector. By the formed shiny pattern, you will see the condition of the lamellas, all the uneven surfaces.
• If the collector is even, then the groove will be uniform.
• If there are holes, then continue the groove until the surface is leveled.
• For the last pass, you need to file a cutter by one fourth from division.
• For polishing, take sandpaper with a thousandth grain and turn on the machine so that the anchor rotates in the direction in which it rotates during operation.

Do not forget to clean the rotor from the chips so that there is no closure.

Nadfil, without damaging the filler filler, remove the residues of the impregnation. Count the guides in the groove. Calculate the number of turns in the section and measure the diameter of the wire. Draw a diagram. Cut the sleeve from cardboard for insulation and insert them into the grooves.

After winding, weld the conclusions of sections with collector cocks. Now check the winding by the tester and the short circuit indicator. Get the impregnation.

Instructions for impregnation (taking into account the regulator of the number of revolutions)

• After making sure there are no problems, send anchor to the electrical admission to heated for better epoxy resin.
• After warming up, put an anchor on the table under an angle for better spreading on the wires. Drip with resin on the frontal part and slowly twist the anchor. Drip before the adhesive on the opposite frontal part.
• Place the anchor horizontally and drip on both frontal parts. Twist the anchor to the loss of fluidity.
• Leave in an upright position until complete polymerization.

At the end of the process, slightly set the collector. Balanced the anchor using dynamic balancing and corner grinder. Now put it finally on the bearing. It is necessary to clean the grooves between the lamellas and polish the collector. Make a final check for cliffs and closing.

The peculiarity of the winding for Bulgarians with an adjustable number of revolutions is that the rotor is wound with a power supply. Current density affects the number of revolutions. The cross.section of the wire is overstated, and the number of turns is underestimated.

A malfunction of the anchor

There are criteria on the basis of which we can conclude that the anchor repair is required:

• the number of sparks emanating from the brushes on the engine collector increases;
• vibration appears at low speed;
• The working shaft begins to move in different positions.

The presence of these signs indicates a breakdown of the anchor. Subsequent use can be dangerous.

• cliff of electric current conductors;
• close between turns;
• disturbance of insulation, which leads to the closure of the winding onto the metal surface of the rotor;
• steaming the endings of the collector;
• The unequal abrasion of the collector.

As a result of these malfunctions, the engine gradually stops working. To find out the reason for the refusal of the angle grinding machine, diagnostics should be carried out. It can be carried out visually or using the appropriate devices.

Necessary tools

The following main materials, tools and devices are required to rewind the rotor windings.

Rewinding can be carried out in two ways:

• completely manually without the use of any equipment;
• productivity increases greatly using the simplest devices.

The user must be able to handle an electric soldering iron.

The presence of a winding wire, the diameter of which should correspond to the wire out of order.

Electrical insulating cardboard or other similar material.

Elevator paper, textolite plates, soft species and other materials for auxiliary work.

Epoxy resin or other impregnation varnish.

Another fitting tool: hammers, sets of screwdrivers, hacksaw cloths, sharp objects, such as a well.sharpened knife, chisel and other tools.

Where to begin?

Since the installer device is simple, the repair of the Makita peorator must be started with its disassembly. The disassembly of the peorater is best done by already verified order.

• Remove the back cover on the handle.
• Remove electrical coal brushes.
• Disconnect the body of the mechanical unit and the stator case.
• Disconnect the rotor from the mechanical unit.
• From the stator body, extract the stator.

Remember, the body of the stator is green, the body of the mechanical block with the black rotor.

Disconnecting the rotor from the mechanical unit, we proceed to determine the nature of the malfunction. Rotor Makita HR2450 poses.54; Article 515668-4.

How to find a short circuit in the rotor

Since you are making independent repair of peorators, you need an electrical circuit of the Makita 2450, 2470 peorator.

Makita 2470, 2450 Poorators use collector electric motors.

Determining the integrity of the collector engine begins with a general visual inspection. The faulty rotor has poses.54 traces of burnt winding, scratches on the manifold are visible, traces of Gary on the Lamel of the collector. A short circuit can only be determined in the rotor, in the chain of which there is no break.

To determine a short circuit (short circuit), it is best to use a special IK-32 device.

Checking the anchor on the short circuit using a homemade indicator

Having made sure, using the indicated device or a home.made device, that the rotor between the turns of the turns of a short circuit, proceed to its disassembly.

Rotors before disassembly

Before disassembly, be sure to fix the winding direction. This is done very simple. Looking at the end of the rotor from the collector, you will see the winding direction. There are two windings of winding: clockwise and counterclockwise. Fix and write down, you will definitely need this data with independent winding. The rotor of the makita peorator direction is a clockwise winding, right.

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

If damage to the anchor is established with guaranteed accuracy, the part must be removed from the electric motor. The disassembly of the motor must be done with special accuracy, having previously removed the brushes and disconnecting the power terminals. The rotor is removed along with the supporting bearings and the impeller of the engine cooling, they make up a single whole with it.

If most of the wiring is damaged in the anchor and the balancing is disturbed as a result of overheating, it is better to replace it entirely. Increasing the balancing is indicated by increased vibration and uneven hum when operating the mechanism.

How to rewind the anchor. step.by.step instructions

If the balancing of the anchor is not broken, and the problem is only in spoiled windings, then such an anchor can be restored independently by rewinding the coils. Ringing the rotor at home requires great patience and accuracy.

The master must have skills in working with a soldering iron and devices for diagnosing electrical circuits. If you are uncertained in 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:

• New winding wire. Copper core with diameter, exactly corresponding to the old conductor is used;
• dielectric paper for isolation of the winding from the core;
• varnish for pouring coils;
• soldering iron with tin-blue solder and rosin.

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

The rewinding process consists of the following steps:

• Dismantling of old windings. They must be carefully removed without damaging the metal hull of the anchor. If any burrs or damage were found on the case, they must be made up with a file or sanded. Sometimes, for complete cleaning the body from toxins, the masters prefer to burn it with a burner.
• Preparation of a collector for connecting a new wire. To remove the collector there is no need. Lameli should be examined and measured with a megammeter or multimeter of the resistance of contacts in relation to the body. It should be no more than 0.25 MOM.
• Removing the old wiring on the collector. Thoroughly remove the remains of the wires, cut the grooves in terms of contacts. In the future, the ends of the coil wires will be inserted into the grooves.
• Installation of sleeve for anchor. Sleeves are made of dielectric material 0.3 mm thick, for example, electrical cardboard. Cut a certain amount of sleeves and insert into the grooves of the purified anchor.
• Rewinding coils. The end of the new conductor is soldered to the end of the lamella and wound with successive circular movements, counterclockwise. Such styling is called “laying to the right”. Repeat the winding for all coils. Near the collector, pull the wires with a thick thread from the x/b fabric (it is forbidden to use kapron, as it melts when heated).
• Checking the quality of the winding. At the end of laying all the windings, check the absence of inter.flip circuits and possible breaks with a multimeter.
• Finish processing. The finished coil is treated with varnish or epoxy resin for fastening the winding. In factory conditions, impregnation is dried in special furnaces. At home, this can be done in the oven. As an option. to use rapidly dry varnishes for impregnation, applying a coating in several layers.

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How to check the anchor of the corner grinder for serviceability

If the anchor is faulty, the engine overheating occurs, the insulation of the winding is melted, the turns are shortened shortly. Contacts connecting the anchor winding to the collector plates are soldered. The current supply stops and the engine stops working.

Standard diagnostics

Before you take the diagnostic device, inspect the anchor. It may be damaged. If the wiring is melted, the burnt insulation varnish will leave black traces or a specific smell. You can see bent and crumpled turns or conductive particles, for example, the remnants of the solder. These particles are the cause of a short circuit between turns. Lamels have bent edges called cocks to connect with the winding.

Due to violation of these contacts, the lamella is burned out.

Other damage to the collector: raised, worn or burnt plates. Graphite from brushes can accumulate between the lamels, which also indicates a short circuit.

Complex loop winding

If necessary, get an even larger number of parallel branches use a complex loop winding of the anchor (rice. 13.eight). Such a winding contains two simple loop windings (m = 2), so it has the number of parallel branches doubled, t.e. 2a = 2 2p = 4p. Such windings are necessary in significant power machines at low network voltage: 12; 24; 48 century.

In order for the distribution of currents in parallel branches of the anchor winding to be the same, it is necessary that the electrical resistance of these branches does not differ from each other and that the EMF introduced in the sections that make up each parallel branch are the same. If these conditions are not observed, equal currents appear between parallel branches that violate the work of brush-collection contact.

The exception is a simple wave winding. The sections of which are evenly distributed under all poles of the machine, so the magnetic does not symmetry of the machine does not cause the appearance of equalizing currents in this winding. As for the simple loop and all types of complex windings of the anchor, they always have reasons for the appearance of equalizing currents. This leads to the need for the use of the so-called equalizing connections in the indicated windings, through which equalizing currents are closed, unloading brush-collection contact from overload. Equal compounds complicate the manufacture of the anchor winding and lead to an additional consumption of winding copper.

Winding direction and initial groove

In order to rewind email. engines in domestic conditions, it is necessary to remember, write down, or photograph each stage of work. This will greatly facilitate the repair, will avoid inaccuracies during assembly. To determine the direction of winding and the initial groove, you need to find a coil not covered by others. It is she who is the last.

In the event that the winding is laid to the right, then the initial groove is located to the right of the extreme coil. It is from here that it is necessary to start laying the wire. Only in this way can you achieve the most accurate winding, very close to the factory. If the initial winding is symmetrical, the coils are laid in it, then the initial grooves will be two. You can find them in the same way as in the past case.

Peculiarities

The master must definitely find out how many turns of the wire are laid in one groove and in the entire coil. To do this, you need to separate the coil located on top and calculate how many turns in it. If necessary, then disassemble using a gas burner. The number of turns to the groove directly depends on:

After calculation, you need to prepare a collector, it is not required to dismantle it. To do this, you just need to measure the resistance value between the body and the lamellas.

Resistance should be in the range of 200-250 kom. After that, you must completely dismantle the old conductor, for this, remove the winding. Thoroughly protect all the grooves and the anchor body. Nar, burrs, be sure to polish with sandpaper. After that, rectangular segments corresponding to the size of the grooves in the anchor must be cut out of cardboard.

Anchor of corner grinder: independent elimination of problems in work

Corner grinder is used to perform many tasks in the household. Regular use can lead to a breakdown of the device. The most commonly broken element is the anchor. It has a high thermal load, and also affects the mechanical and electromagnetic effects. As a result, many craftsmen have to think about the repair of this detail.

Anchor device

The anchor of the corner grinder consists of a winding that conducts a current, and a magnetic circuit. In the magnetic circuit there is a shaft that steal. The design of the magnetic wire is formed with plates and grooves, which are insulated among themselves by coating varnish.

A certain sequence of laying the anchor winding conductors in the grooves has been developed. The conductors form a turn. Its ending is binded on the lamella.

The arrangement of the beginning of the starting round and the end of the latter is compiled in such a way that they are closed on one lamella.

With constant overheating of the angular grinder motor, the anchor is melted. As a result of high temperature, the contacts of the wires may disappear, which connect the primary winding to the collector. All this leads to the fact that the current is not supplied.

A malfunction of the anchor

There are criteria on the basis of which we can conclude that the anchor repair is required:

• the number of sparks emanating from the brushes on the engine collector increases;
• vibration appears at low speed;
• The working shaft begins to move in different positions.

The presence of these signs indicates a breakdown of the anchor. Subsequent use can be dangerous.

• cliff of electric current conductors;
• close between turns;
• disturbance of insulation, which leads to the closure of the winding onto the metal surface of the rotor;
• steaming the endings of the collector;
• The unequal abrasion of the collector.

As a result of these malfunctions, the engine gradually stops working. To find out the reason for the refusal of the angle grinding machine, diagnostics should be carried out. It can be carried out visually or using the appropriate devices.

Visual inspection rules

Standard diagnosis involves a visual analysis of the device. It is necessary to analyze the integrity of the wire and the supply of current to the motor collector.

With normal feeding, the angular grinder should be examined from the inside. To disassemble the device will not be difficult. It is best to photograph the location of the main modules of the device when analyzing.

After disassembling, conduct a visual test of the anchor on the following properties:

• The stroke of the anchor must be free;
• the absence of black spots and smells that may talk about melting the winding, the insulating varnish of which leaves traces;
• the absence of crumpled turns and soldiers of solder, which leads to a short circuit;
• There should not be burnout on the lamella contacts, otherwise the binding of the Lameli Petushka and the shirt of the winding should be checked;
• lack of worn out or burnt records;
• The space between the lamellas should not contain graphite residues from the brushes.

If there are no deficiencies during visual inspection, then it is necessary to check with devices. The anchor on the corner grinder can be checked both using a tester and using a regular light bulb.

Tester inspection

The multimeter is set to the Ommeter position. The resistance of 200 Ohms is set. The probes are connected to the lamellas located next to each other.

If the value on the device is less than 1 ohm, then there is a short circuit. With a value of more than average, the presence of a break in the turns is possible.

With a high resistance or absence of any value (in the case of the use of a digital device), one can also judge the break.

There are situations when the cliff is not detected. Then a breakdown is done. With maximum resistance, one of the probes is placed on the shaft, and the other moves along the plates. If the value is zero, then there is no damage. Then the rotor is checked in the same way by the multimeter. The probe in this case moves through the lamella. If it is impossible to check the test, the light is used.

Block control

In the absence of a device at hand, many are interested in the question of how to check the corner grinder for possible anchor breakdown. The supply supplier wire is torn, and a light bulb is placed at the gap of one wire. Then the shaft rotates. By changing the brightness of the light bulb, you can judge the closure between the turns. In the absence of combustion, the following conclusions are possible:

• The location of the brushes does not correspond to the working position due to the operation of the retaining spring;
• rupture of the supply contour;
• Closing or rupture in the stator winding.

You can call the indicator of short.closed turns and an anchors checking device. An experienced person can do this.

Is the anchor repair possible

Repair of the anchor of the corner grinder cannot be performed if there is vibration, since the balance is violated. This situation requires a replacement. It is possible to eliminate a short circuit and replacement of the inspection.

First you need to disassemble the engine and remove the rotor. But before that, turn off the power terminals and remove the brushes. The rotor of the corner grinder gets along with the support bearing and impeller for cooling.

Rewinding of the anchor

Anchors for the Bulgarians Corner grinder are reinforced at home. To do this, you need to have certain skills when working with a soldering iron. To rewind the anchor with your own hands, you will need:

• wire with copper residential, which corresponds to the previous conductor;
• dielectric paper to isolate the winding;
• varnish for pouring coils;
• soldering iron.

It is important to calculate the number of turns in the old winding before starting the anchor and perform the same number on the new coil.

• Removing previous windings. try not to spoil the surface of the case. If damage occurs, grind the sandpaper or file;
• The examination of the collector. the value of the resistance of the lamella contacts in comparison with the shell should not exceed 0.25 MOM;
• The collector’s cleaning from old wires is the development of grooves to insert the ends of the new wires;
• Setting sleeves. they are made of material that does not conduct current, for example, electrical cardboard. Their size is 0.3 mm;
• rewinding of coils. the end of the new wire joins the end of the lamella. Rewound in the direction counterclockwise. Near the collector, fix the wires with a cotton thread;
• control for the lack of shorts. measure the resistance by the tester;
• applying varnish or epoxy to fix the winding. dry in the oven or use products that quickly dry out.

How to clean

The state of the collector significantly affects the service life of the brushes, significantly reduces sparking, which will make the operation of the corner grinder on the parameters close to nominal. Why is it necessary to regularly clean it.

One of the options for cleaning technology is shown in the next video. Affordable: accessible materials and tools are used:

• An emery canvas with abrasive numbers 1000 and 2000;
• felt circle with a cylindrical shank;
• electric screwdriver or drill;
• paste GOI;
• needle;
• Nadphil;
• Small brush.

The technology of operations is quite simple. Important: do not forget to remove the chamfers on the lamella, actually what is the super.

Features of the repair of collector drives

In this type of electromas, mechanical malfunctions more often occur. For example, erasing brushes or clogging of collector contacts. In such situations, the repair is reduced to cleaning the contact mechanism or replacing graphite brushes.

Testing the electric part is reduced to checking the resistance of the anchor winding. In this case, the probes of the device to two neighboring contacts (lamella) of the collector, after the readings, is measured further in a circle.

Checking the anchor of the collector electric motor

The displayed resistance should be approximately the same (taking into account the error of the device). If a serious deviation is observed, then this says that there is an interval short circuit or cliff, therefore, rewinding is necessary.

Extracting brushes

We alternately install the screwdriver on the fastening screw and turn it out.

With your hand, carefully remove the brush and examine it.

The naked eye is visible traces of soot with the formation of layout of graphite dust.

The same picture is observed on the second brush. Traces of sparking are clearly visible on the end surface.

This allows us to conclude that an external inspection of the collector and an electrical check of the state of the rotor and stator windings are needed.

It is impossible to do this through the closed engine of the engine: it requires disassembly and seizure of the anchor.