Table of Contents

How to call the rotor of the corner grinder multimeter

Some experience a non.Working tool with a tester. A rather correct solution to the obstacle, but in this case this measuring device, to chagrin, is not enough for us to show us.

It is necessary to realize that the anchor of a small engine of a construction tool has a winding and a magnetic circuit where the rotation shaft is placed. One end ends with the lead gear, the other collector with lamellas. The magnetic circuit has soft plates and grooves, which are covered with a special coating for insulation.

check, rotor, corner, grinder, multimeter

As the internal diagram of the rotor indicates, in the grooves there are conductors of the anchor winding, there are two of them. Any of them is a half of the turns, the edges of which are connected in the lamellas of the greenhouse. In one groove there are: 1st round (its beginning) and the last (end) that are closed on one lamella.

So, how the anchor of the corner grinder is checked? The problems of the rotor can happen solely in certain cases and for subsequent reasons:

  • Cutting off.Conductors;
  • Interpretation circuit;
  • Formation of isolation. In this case, the winding of the iron base is released, almost always the fault of such a breakdown is a violation of the insulating winding of the conductors;
  • Collapse of the collector output;
  • Unevenly worn out collector.

If the anchor is not working, this leads to overheating of the motor, which is why the insulation protection is melted, the result is the Kutsey closing of the turns. Then there is an independent plowing of contacts that serve as a joint winding and collector records. The current stops serving and the tool engine does not work.

The stator of the corner grinder can also be a prerequisite for the failure of the power tool.

For what reasons, the corner grinder may fail

Most often, the tool stops working when the anchor (rotor) is damaged. When opening the body, you can see the burning and uneven wear of the brushes. The indirect signs of such a breakdown are the heating of the tool and vibration during operation.

It is more difficult to detect electrical breakdowns. These include:

Also, quite common reasons for the refusal of the tool can be:

  • The wires of the wires in the power cable and the circuit breaker malfunction. The angular grinder does not turn on;
  • Interpretation closing in the rotor windings and electronics malfunction leads to the fact that the tool works only at low speeds;
  • Sparking due to erasing coal brushes or strong wear of the engine collector;
  • The appearance of smoke occurs when closing in the windows of the stator or rotor, as well as with excessively intensive work (when air cooling channels are clogged with dust).

As you can see, many breakdowns are due to the malfunctions of the electrical part of the tool. Therefore, you need to be able to detect them before deciding to send the tool to the repair workshop.

Checking the rotor of the corner grinder with various methods

Some experience a non.Working tool with a tester. The correct solution to the problem is quite correct, but in this case this measuring device, unfortunately, can show us little.

You need to understand that the anchor of a small engine of a construction tool has a winding and a magnetic circuit where the rotation shaft is located. One end ends with the lead gear, the other collector with lamellas. The magnetic circuit has soft plates and grooves, which are covered with a special coating for insulation.

As the internal diagram of the rotor shows, in the grooves there are conductors of the anchor winding, there are two of them. Each of them is a half of the turns, the edges of which are connected in the lamellas of the greenhouse. In one groove there are: the first round (its beginning) and the last (end) that are closed on one lamella.

So, how the anchor of the corner grinder is checked? Rotor malfunctions can happen only in some cases and for the following reasons:

  • Cutting off.Conductors;
  • Interpretation circuit;
  • Formation of isolation. In this case, the winding on the metallic base of the anchor is obtained, in most cases the fault of such a breakdown is a violation of the insulating winding of the conductors;
  • Collapse of the collector output;
  • Unevenly worn out collector.

If the anchor is not working, this leads to overheating of the engine, which is why insulation protection is melted, the result is a short circuit of the turns. Next, there is an independent plowing of contacts that serve as a connecting to the winding of the rotor and the collector plates. The current ceases to be supplied and the engine engine does not function.

The stator of the corner grinder can also be the reason for the failure of the power tool.

Methods of verification and diagnosis

How to check the rotor of the corner grinding grinder for performance? It is simply necessary to check the place of engine breakdown with its malfunction. After all, it is this procedure that will help to understand which part of the mechanism works and which is no longer. Diagnosis is carried out in several ways:

Sometimes even a visual inspection is enough to understand that there was a short circuit. In this case, the wires, where isolation will be melted, will be visible to the details in this case. It is also worth paying attention to the charred varnish or its smell after overheating of the engine.

Violation of contact also occurs due to the collection of dust (graphite from brushes) on the lamellas. It is not difficult to notice him, as well as clean the anchor from such finely dispersed garbage.

A device called “multimeter” also helps to install a breakdown of an electrical device. It is enough to set up the resistance of 200 ohms and put the probes on two nearby lamellas. The resistance between all plates will be the same with the normal functioning of the part. If the indicator is less than 1 ohma, then the case is the closure of the turns. Когда показатель больше единицы – это означает обрыв витков обмотки. The device can even go off the way, since the resistance in the latter case can be very great. Using an analog multimeter, the arrow will swing to the right to the very end, the digital measurement device will not show anything.

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

Had to DRILL the engine block. NIGHTMARE Diag! LS 5.3 Check engine!

When there is no device to determine the resistance, you can use a simple 12 volt bulb and a power of 40 watts. Two wires attach to the light bulb. Where there will be a minus, you need to make a gap. Next, supply voltage. We apply the ends of the wire on the gap to the collector’s plates and scroll it. Когда при такой манипуляции лампочка горит без смены яркости, то замыкания нет.

Another verification method concerns the breakdown of current to the mass. To do this, we associate one wire with lamellas, and the second with iron anchor. After we carry out the same manipulation with the shaft. In case of violation of work in the part, the light will glow.

Any of the methods can be checked by the stator of the angular grinder, which can also be the cause of the breakdown or engine heating.

Indicator as a way to check the turns during short circuit

Manufacturers collect corner grinders in different ways, therefore, some do not see the wires that join the collector. The insulation is well hidden under the bandage or opaque compound, and to check its serviceability, you can use the indicator of short.Closed turns. The device is easy to use and has small sizes.

To determine the closure, first diagnostics for the absence of breaks is carried out. To do this, you need a tester that will measure the resistance between the lamellas. The resistance indicator should not be higher than half, if so. That is, a break. When the norm is displayed on the monitor, we proceed to the next stage.

The resistance device has a sensitivity control function, which is also used to diagnose. We look at two bulbs and set up the tool so that red. We apply the indicator to the winding, while slowly twist the anchor. If the light is glowing, then this indicates a short circuit.


The rotor diagnostics device helps to calculate the interitaic circuit of the winding. The throttle is a transformer with the presence of a primary winding and a cutout of a magnetic gap in the core.

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When the anchor interacts (put in the gap) and the throttle, the winding works as a secondary, transformer. If, with the device and rotor on the metal plate on, the vibration or magnetic effect will be visible. There is a closure. Free movement of the plate along the turns indicates the complete serviceability of the anchor.

How to check the anchor of power tools at home

An independent check of the anchor of the electric motor can easily be performed at home. This will allow, firstly, to independently restore the performance of the tool, and secondly, not to overpay the specialist for a fairly simple operation. To check you will need only a screwdriver and a multimeter. Additionally, you can purchase a special device to determine the inter.Seal circuit.

Visual examination of the tool

There are often situations when the tool still works, but not as it should be. And in 30 % of cases the fault of the burnt anchor. This can be identified visually, even before the opening of the body.

The indirect signs of the “tired” anchor of the electric motor are such problems:

  • When the electric motor is visible, a very strong sparking on the collector is visible.
  • When trying to launch a corner grinder (drill, disc saw, etc.) There is a rigid voltage subsidence (lighting blinks).
  • The launch of the electric motor is accompanied by sharp jerks.
  • A characteristic smell of burning wiring is heard from the body.
  • The tool does not gain the same power.

Please note that most of these signs can also indicate the banal wear of the electric motor brushes. If they were erased or crushed, then the anchor, most likely, had nothing to do with. We change it to new ones, clean the collector from the graphite raid, and calmly work on. If the brushes look intact, and the above symptoms are observed, with a 80 percent probability, it can be argued that the problem is in the anchor of the electric motor.

If the power tool does not show signs of life at all, there may be much more reasons, and not only an anchor check will be needed.

Dismantling of the power tool

One way or another, if everything is in order with the brushes, you can’t do without disassembling the tool. At this stage, the most important thing is not to harm even more. Particular attention should be paid to the correct selection of screwdrivers, since the spoiled screws will be twisted problematic, and the check will turn into painful locksmiths. Some tools use fasteners of different lengths. Their location must be remembered (it is better to record or draw).

So that after diagnostics and repair, it is recommended to successfully assemble a power tool, it is recommended to photograph each stage of disassembly. This will help a lot if you forget, what part stood before checking.

Preparation of the anchor of the electric motor for verification

After the anchor was extracted from the case, it is advisable to prepare it for diagnosis. The procedure consists in thoroughly cleaning the collector lamellas from graphite plaque. If this is not done, further verification may not give the required result.

You can remove the plaque using rags and alcohol. If the lamella does not have a plaque, but a thick layer of soot, it will have to be removed with fine.Grained sandpaper paper. Please note that there are no visible grooves from the abrasive on the collector. This will worsen the contact of the lamellas with brushes, and also accelerate their wear.

check, rotor, corner, grinder, multimeter

Visual examination of the anchor before checking

  • The collector’s lamellas. There should not be strong wear on them.
  • The winding of the anchor of the electric motor. We are looking for cliffs or visible traces of combustion of the wire.
  • Contacts. The entire winding is soldered to the collector lamella. These points must be checked for integrity.

If the collector is too deep, the anchor must be replaced. Gari traces on windings or contacts indicate that the detail is faulty. You can rewind, of course, but this is ungrateful, and requires special skills. It’s easier to buy a new one.

Checking the anchor with a multimeter

Checking the anchor of the electric motor with a multimeter consists of two stages. First of all, it is necessary to call him for a breakdown. To do this, the multimeter is installed in the circuit check mode with the sound signal.

Then we pass through the collector lamella in one probe, and the second on the anchor body.

The second stage of checking the anchor with a multimeter is to measure the resistances between neighboring windings. To do this, the device is installed in the mode of determining the resistance to the most minimum threshold (as a rule, it is 200 Ohms).

Further, the probes are applied to the neighboring lamellas of the collector, and the readings on the screen are recorded. When measuring the resistance between all neighboring lamels, there should be the same value. If this is not the case, the anchor is faulty.

The same is the complete absence of resistance on any of the windings.

Checking the anchor for an interval circuit

Before checking the anchor of the electric motor for an interval short circuit, you need to get a special device. It is worth a penny, and it is full of information on the Internet.

The essence of the anchor check is to apply this very tidy to all sections of the case. According to the indications of the LED indicator, the malfunction is determined.

Replacement of anchor and reverse instrument assembly

A faulty anchor is either given to rewinding or replaced by a new. Fortunately, today even on the cheapest Chinese tool in online stores you can find suitable components. It is advisable to check the new or restored anchor before installation by the algorithm described above.

If everything is normal, we collect everything back and work. Changing the anchor of the electric motor is also recommended to install new brushes. Fortunately, they are penny.


How to check the anchor of the corner grinder tester. Novaso

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Visual inspection of the breakdown

Any, even the highest quality tool, is subject to breakdown. Especially if it is intensively exploited. In the case of a breakdown of a corner grinder, you are unlikely to get a tool on your own. However, a preliminary inspection can be carried out without special skills.

The most commonly anchor fails. Damage can be mechanical. During visual examination, uneven wear of the brushes, as well as their burning, will be visible. In addition, with faulty anchor, the angular grinder will vibrate and heat.

There are electric breakdowns. These include:

Such malfunctions can be identified using special measuring devices, for example, multimeter.

Check the anchor with a multimeter

In order to conduct such a check, you should disassemble the corner grinder and gain access to the anchor. The multimeter must be put in the range of 200 Ohms, and the probes of the device touch two adjacent lamberries.

We measure measurements on all turns of the winding, if all the readings are the same, then the anchor is serviceable. If the resistance values ​​differ on some round, then there is a malfunction. You should also check the anchor winding body.

The device of the anchor of the corner grinder

The anchor of the angular grinder engine is a conductive winding and a magnetic circuit in which the rotation shaft is pressed. He has a lead gear at one end, on the other a collector with lamellas. The magnetic circuit consists of grooves and soft plates covered with varnish for isolation from each other.

In the grooves, according to a special scheme, two anchor winding guides are laid. Each conductor makes up a half of the turns, the ends of which are paired on the lamella. The beginning of the first round and the end of the latter are in one groove, so they are closed to one lamel.

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 check using a multimeter

  • Place the resistance of 200 Ohms. Combine the probes of the device with two neighboring lamellas. If the resistance is the same between all neighboring plates, then the winding is serviceable. If the resistance is less than 1 Ohm and very close to zero, there is a short circuit between the turns. If the resistance is higher than average in two or more times, then there is a break in the windings of the winding. Иногда при обрыве сопротивление настолько велико, что прибор зашкаливает. On the analog multimeter, the arrow will go to the right to the right. But it will not show anything on the digital.
  • Definition of breakdown for mass is done in the absence of a break in the winding. Put the maximum resistance on the device scale. Depending on the tester, it can be from 2 MOM to 200 MOM. Connect one probe with the shaft, and the other with each plate in turn. In the absence of malfunctions, the resistance should be zero. Do the same with the rotor. Combine one probe with the iron rotor housing, and move the other by lamella.
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If you do not have a tester, use a 12.Volt bulb with a voltage of up to 40 watts.

How to check the rotor of the corner grind

  • Take two wires and connect them to the lamp.
  • On a minus wire, make a gap.
  • Serve voltage on wires. Apply the ends of the gap to the collector’s plates and scroll it. If the light bulbs burns without changing brightness, then there is no short circuit.
  • Make a testing test for iron. Connect one wire with lamellas, and the other with the rotor iron. Then with a shaft. If the light bulb is burning, then there is a breakdown on the mass. The winding closes the rotor or shaft.

This procedure is similar to a multimeter diagnosis.

Checking the indicator of short.Closed turns (IKZ)

There are anchors in which there are no wires connected to the collector due to filling with an opaque compound or due to a bandage. Therefore, it is difficult to determine the switch on the collector regarding the grooves. The indicator of short.Closed turns will help in this.

This device is small in size and is easy to operate.

First check the anchor for the absence of cliffs. Otherwise, the indicator will not be able to determine a short circuit. To do this, measure the resistance between two neighboring lamellas. If the resistance exceeds the average at least twice, then there is a break. In the absence of a cliff, proceed to the next stage.

The resistance regulator allows you to choose the sensitivity of the device. He has two bulbs: red and green. Set up the regulator so that the red light starts burning. On the indicator case there are two sensors in the form of white points located at a distance of 3 centimeters from each other. Attach the indicator indicator to the winding. Slowly twist the anchor. If a red light lights up, then there is a short circuit.

check, rotor, corner, grinder, multimeter

Diagnostics by the anchors checking device (throttle)

The anchor testing device determines the presence of an inter.Flip circuit of the winding. The throttle is a transformer that has only the primary winding and the magnetic gap in the core is cut out.

How do we conduct the diagnosis of the starter.

In order to conduct a visual inspection of each starter detail and conduct its diagnosis, we completely disassemble the unit.

Before disassembly in rare cases, we put on a stand, and only the starter that we did before. The question is that there is a network power source where there is about 800 amperes on the stand, and if the starter is closed somewhere and this can be cured, then after such a launch it will simply burn.

Starter inspection for mechanical damage.

The unit is initially inspected for various mechanical damage (chips, cracks on the case, damage to the power bolts of a retracting relay).

Next is a complete disassembly of the unit for components for diagnosis.

Checking the anchor of the starter.

The starter’s anchor is examined for mechanical or electrical damage. With a large wear of the starter’s bushings (starter bearings). The anchor walks and can cling to the stator winding. In this case, the bullying and the breakdown of the insulation of the stator windings are obtained.

Also when brushes wear out, and dense contact disappears between the collector and brush, the formation of an electric arc occurs, and burnout, melting the anchor collector. Also, with the long operation of the starter, or if the ignition lock is not serviceable, the anchor spin, heats up very much, as a result of which the insulating varnish follows. Everything is good visually, but in fact an interval circuit or a breakdown of isolation.

Further, if visually the state of the anchor did not doubt its serviceability, a test is checked on a megommeter for the resistance of the insulation of the winding.

Checking the brush node of the starter.

The brush node is examined for mechanical or electrical destruction. When the anchor collector is falling apart, the knot can simply break, twist it without obvious exposure to the current, or maybe there is an option when the driver twists to the victorious, while the collector, node and brushes heat up very much and begin to collapse, forming soaps, fragments, graps of the graphite of brushes into layers.

Further, if the knot is visually normal, it is checked on a megommeter for insulation resistance.

Next, it is necessary to determine the degree of wear of the brushes by visual inspection.

Checking the Starter Stator.

If the stator based on permanent magnets, then it is inspected for cracks, chips, peeling of magnets, and the presence of any metal parts of the starter, in the form of primagnetic particles.

If the stator is based on the classic winding, then it is examined for mechanical damage, melting, programs, rust, rusty. Further, it is checked on a megaommeter for the insulation resistance of the windings.

In powerful, large stators, as a rule from cargo equipment, part of the insulating coating is necessarily opened for inspection and verification of interval insulation. Когда используют “пускачи”, “тарзаны” то сила пускового тока такая, что внешне обмотка выглядит прекрасно и даже на корпус не пробивает, а внутри просто каша, провод просто сплавляется.

Checking the retracting starter relay.

Visual inspection for mechanical damage to the housing, damage to power bolts, inspection of the launch terminal for a break and acidification.

Inspection of the integrity of the rear insulation cover.

If everything is fine, then the relay is launched by supplying the operating voltage, the operation of the retracting winding that holds the winding is checked and the loss of voltage on the contacts is measured.

In the relay where there is the opportunity to remove the insulating cover, it is removed and the contacts are inspected for the formation of socks and wear.

Checking the starter gearbox.

Inspection for mechanical damage (breaks the guide slots of the bendix, the gear shaft bursts. Planets fall apart, gearbox stars).


Bendix check.

Inspection of the gear and guide slots, for chips and licking.

Bendix check for a breakdown. This operation is done when the starter is already completely collected. The unit is put on the stand, it is very tight. A special adaptation is brought to the bendix, which holds the gear and starts to launch. The stand measures the strength of the moment from what cries the bendix. Well, if the bendix is ​​weak just to break it off.

Checking the front and back covers of the starter.

Bushings or bearings for wear and play are checked. Looks a seat under a sleeve or a bearing on the head (she is a dome or front cover) of the starter.

They check the seats for the sleeve or the rear cover of the starter.

The fasteners are inspected, since they are also broken from vibration or insufficient tightening of bolts.

Preparing the tool for testing

If, while pressing the trigger button, the angular grinder does not turn on, and the electric motor does not rotate, then the rotor and the electric engine are checked.

To do this, prepare the workplace, disassemble the corner grinder, clean it of pollution and perform a visual inspection. After that, you can start calling.

Visual inspection

Quite often, the corner grinder still starts, but its characteristics are no longer consistent. In almost half of cases, this is due to a burnt rotor. It is possible to identify this visually without opening the body when:

  • During operation, sparking was found on the collector.
  • During the launch, the corner grinder may occur stressing voltage in the house network.
  • Engine operation is accompanied by jerks.
  • The smell of burning wires is released from the engine body.
  • The tool does not develop speed, and works with low power.

Important! Similar signs are manifested with wear of brushes. After their replacement, these malfunctions in the work are damaged. If this is not the case, then the anchor is still the fault of the failure.

When the anchor is not operational, the engine is overheating. The insulating coating of wires begins to melt, which ultimately leads to a short circuit between them. Then the process of soldering electrical contacts begins, which connect the rotary windings and plates. The current is not supplied to the electric motor, and the corner grinder becomes inoperative. The stator of the corner grinder is often the reason for its failure.

Dismantling corner grinding

In order to test the anchor or stator by a multimeter, the corner grinder will need to be disassembled. Before starting work, you need to study the factory assembly scheme angular grinder. It is important not to spoil the structure of the corner grinder due to incorrect actions, and you also need to choose the correct configuration of the screwdriver in order to unscrew the screws, otherwise they will have to be drilled.

In different modifications of the corner grinder, the fasteners are used of different lengths, so you need to fix the locations of the screws. It is better to make a photo of a showdown on a smartphone.

The anchor is made of winding and magnetic circuit. A slotting gear is located at one end, and on the other. A collector. The magnetic circuit is made of soft plates with grooves protected by a special insulating layer.

There are 2 rotor windings in the grooves, each represents half the turns, the edges of which are united in pairs in the lamella. In the 1st border is: the beginning of the 1st and the end of the last, closing on one lamel.

How to call the rotor of the corner grinder multimeter

The anchor of the corner grinder is a rotating element of the electric motor, which is the “core” of the entire structure of the device. The knot consists of a shaft. A metal axis of rotation, a wire winding, a collector. A set of contact plates, which are the ends of the windings of the winding and cooling screw. The anchor mechanically interacts with the front and rear bearing, the gear node of the corner grinding and graphite brushes; electromagnetic way with the stator. The outer part of the electric motor. The voltage is supplied to the anchor winding through the sliding contact of the brushes with the collector plates. Lamellas.

The current transfer is carried out in rotation mode, which creates the conditions for friction and heating. These conditions carry the prerequisites for potential malfunctions.

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The reasons for the breakdown

The angle of the grinder is the rotor. The rotor is a detail that is subjected to the greatest loads: temperature, mechanical and electromagnetic. Violations of the operating rules prescribed by the manufacturer leads to a quick failure of this unit. Some factors of such violations are:

  • Going beyond the permissible time of continuous work;
  • Lack of protection against aggressive media. Dust, sand, dirt, moisture;
  • Exceeding the load parameters;
  • Mechanical damage;
  • Work at the time of voltage drops.

These reasons can lead to the occurrence of the following fault failures:

  • Melting insulation (insulating varnish) of contacts or winding as a result of overheating;
  • Mechanical damage: scratches, chips, cracks, from contact with foreign particles that fell into the compartment with mobile details;
  • A breakdown at the weak points of the winding caused by overload;
  • Curvature or violation of the balance of anchor shaft;
  • Short circuit or the occurrence of soot on the lamella.

To eliminate the cause of the breakdown, it is necessary to study the device of the anchor of the angular grinder and conduct the appropriate diagnosis.

Methods of verification

Each rotor malfunction is revealed by the corresponding verification method.

Visual inspection

A method of verification with which you need to start diagnostics. Check the anchor collector for the presence of mechanical damage. Scratches, bullying and chips should be absent. Inspect the lamellas for burnout. If one of them is darker or fluttered, there is a short circuit between the plate and the winding tire.

12-volt light bulb

Connect two wires to the lamp contacts. In one of them make a gap. Connect the wires to the power source, put the edges of the “torn” wire on the lamellas so that they do not contact each other. Rotate anchor. If there are no holes in the winding, then the light will burn continuously.


Put this device into the resistance measurement mode. One of the probes (polarity does not matter) put on one of the plates. Another probe is alternately applied to the rest of the lamellas. The sound signal, depending on the multimeter model, will notify that there is a breakdown between the “winding tracks”.


Indicator of short.Closed turns. Used in the diagnosis of closed anchors. This type of rotor is characterized by the lack of access to the location of the winding with the lamellas. The tester has two LEDs. Red and green. Rotating the anchor connected to the tester, you can determine the presence of a breakdown in the winding on the tanned red LED.

How to eliminate the malfunction?

Visual inspection and conduct of tests will help determine the nature of the malfunction and understand whether replacement or repair is possible at home. Failures of the rotor of the corner grinder are divided into two types: amenable and not amenable. The first type includes malfunctions associated with violation of the insulation of the winding, damage to the collector and the iron base. The second type of breakdowns. Factors of deterioration of balancing the anchor in general and its shaft. It is almost impossible to restore the rotor in this case.

Collector repair

If structural damage to the collector lamella is detected, they must be proceeded. You can do this on a lathe or using improvised means. The groove should be carried out evenly. Otherwise, balancing will be violated, which will entail the destruction of graphite brushes during operation and failure of other components of the corner grinder.

Machine groove

The rotor of the corner grinder is installed in the lathe. Since the collector consists of copper plates, and copper is a viscous metal, it is necessary to choose the optimal rotation speed in the range from 600 to 1200. The cutting of the cutter is carried out half the division. At the time of touching the “knife” of the collector, a longitudinal passage is made with the removal of a thin layer of metal. To achieve the best effect, you can make 2-3 passes. Their larger number can lead to damage to the structural integrity of the collector. Between the aisles you need to take breaks, giving copper to cool. Otherwise, varnish isolation between the lamellas may melt.

For grooves with the help of improvised means you will need a vice, drill and several types of sandpaper. The anchor of the corner grinder is extracted from the case, while one part of it remains connected to the gearbox angular grind. The gearbox body is fixed in a vice, the other end of the rotor shaft is clamped in a drill cartridge. The “lips” of the vice and the drill should be on the same line with the axis of the anchor shaft.

Turn on the drill with fixing the start button in the mode of constant operation. Wipe the collector without pressure. Use at least 3 types of granularity. From larger to smaller. The final should be the sandpaper of zero granularity.

At the end of the groove, it is important to remove all the chips and dust from the collector, this will prevent the occurrence of a short circuit between the plates.

Remove the bearing

The edge that is fixed in the drill cartridge is initially installed in the bearing. Before the groove, it is necessary to remove it. In order to remove the bearing without a puller, you can use a vice, a hammer and a chisel. Fix the shaft with the bearing in the vice so that only the bearing is squeezed. Install the sharp end of the chisel in the end of the shaft and remove the shaft from the bearing with the light beats of the hammer.

Additional engine construct

Often the composition of the engines is replete with additional elements that optimize the work that perform a protective, other function. This must include varistors. Resistors connecting each brush with the case, with a sharp increase in voltage, close the spark. Drawing is carried out. Phenomena such as circular fire on the collector lead to the premature failure of the equipment.

The phenomenon is observed as a result of the occurrence of anti-. The generation mechanism is quite simple: when the current changes in the conductor, force is formed that counteracting the process. In the process of transition to the next section, the phenomenon causes the occurrence of the potential difference. The brush-neopoline part of the collector. With stresses of over 35 volts, the process causes ionization of the gap air, we observe in the form of a spark. At the same time the noise characteristics of the equipment worsen.

This phenomenon, however, is used to monitor the constancy of the rotation speed of the collector engine shaft. The level of sparking is determined by the number of revolutions. When the parameter is deviated from the face value, the thyristor circuit changes the angle of voltage cutting in the right direction to return the shaft speed to the nominal. We often meet such electronic boards as part of household kitchen combines or meat grinders. The composition of the engine is as follows:

  • Thermal subjects. The operation temperature is selected to protect insulation from burnout, destruction. The fuse is strengthened on the electric motor body with a steel turn, or is hidden under the insulation of windings. In the latter case, conclusions are sticking out, you can easily rush with a multimeter. It’s easier to trace, securing the help of a tester, an indicator screwdriver, which legs of the connector enters the protection scheme. In normal condition, the thermal object gives a short circuit.
  • Instead of frequencies, temperature relay is placed. Normally open or closed. The last type is more often used. They write a brand on the case, you can find the corresponding type of element on the Internet. Further act according to the information found (type, resistance, temperature of the operation, contact position at the initial moment in time).
  • On the engines of washing machines, speed sensors, tachometers are often placed. In the first case, there are three conclusions, in the second. Two. The principle of action of the hall sensors is based on a change in the difference in potentials in the transverse direction of the plate, through which a weak electric current flows. Accordingly, two extreme conclusions serve to supply power, they should give a short circuit (slight resistance), while the output can only be checked under the influence of a magnetic field in working mode. To do this, you need to supply power according to electrical wiring. We recommend downloading technical information (Data Sheet) to the Hall sensor present in the electric motor. Other options have been invented. You can measure the power supply by the test on the washing machine turned on. We believe readers understand the danger of manipulations. It will be better to remove the electric motor, feed the power separately, only on the Hall sensor. Then it all depends on the design. If the magnet is constant on the rotor, it is enough to simply upset the axis with your hand so that impulses appear at the output of the hall sensor (fixed by the tester). Otherwise, you need to remove the sensor. Having enlisted the help of a permanent magnet, performance is checked. The hall sensor as part of the electric motor usually serves to control the speed of rotation.

Now readers know how to call the electric motor with a multimeter, the review ends. A number of specific devices can be continued indefinitely. The main thing is to call the electric motor winding, the motor usually costs more than other parts. We do not take the case when the Hall sensor goes at a price of 4000. We are sure that readers will be able to supplement the recommendations. But enter the position. It is impossible to embrace the immense within the same review.

Thanks a lot! So laid out on the shelves! I am an electrician myself, but without a mat fails. Thanks a thousand times!

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