Anchor check: how to check the anchor winding with a multimeter

Despite reliability and durability, electric motors from time to time fail. You can set the cause of the breakdown and fix it yourself. You will need a tester, knowledge and a little patience. How to check the anchor of an electric motor at home you will learn by reading this article. We will consider two types of engines most often used in everyday life and in production.

Collector synchronous engines

They are used in household devices (mixers, washing machines, electric drifts, etc.P.), therefore, are designed to work from the network 220V. Their “heart” is an anchor consisting of a fixed stator and a winding on the shaft. If the cause of the malfunctions lies in it, you should start checking with a visual inspection.

  • Blocked or ragged windings;
  • The smell of Gary;
  • Active sparking;
  • Melted collector lamellas;
  • Failure of the bearings;
  • Disconnection of the wiring;

If at first glance defects are not noticeable, for a more accurate examination you will have to arm yourself with a multimeter. The test is taking place in stages:

  • Call the pair of stator windings to the lamellas. Resistance testimonies on each must match.
  • Check the resistance between the anchor body and the lamellas. Ideally, it strives for infinity.
  • Call the conclusions to check the integrity of the winding.
  • Check the state of the chain between the outputs of the anchor winding and the stator body.

The presence of a breakdown on the case is a sign that the engine requires replacing broken parts and a complete repair. It is prohibited to connect it to the network in this case.

Asynchronous engines

Asynchronous electric motors are widely used not only in industry (on machines, compressors, pumps), but also in everyday life (in refrigerators, washing machines of some models). With their malfunction, a visual inspection should begin with the stator windings playing the role of an anchor.

Before the anchor of the electric motor, it is necessary to check other nodes and parts (since the cause may be damaged). Connection cables, magnetic starters, thermal relay, capacitor, and also check the presence of voltage. If everything is in order, make sure that there is no power supply and disassemble the engine.

The reasons why the stator windings cease to work are most often as follows:

If the problem is not detected during the inspection, further diagnosis is carried out using a multimeter. In the units at 380V, which are connected by a “triangle” or “star”, each winding is checked separately. Deviation of the resistance value on them should be no more than 5%. Then the windings are nicknamed the case and with each other. Resistance should strive for infinity, other indications indicate that there is a breakdown of windings between themselves or on the case. This problem is solved by complete rewind.

In 220V electric motors, it is enough to call the working and launch windings. The first resistance should be one and a half times lower than that of the second.

The most difficult stage of the check is the search for inter.Flip circuit, since it is not possible to identify it with a visual examination. You need to use the special meter of inductance. If the value on all windings is the same. There are no problems. The lowest value on any of the windings indicates its damage.

The insulation resistance of the windings is checked by a 1000V megammeter, which is connected to a separate power source. One wire is connected to the unit case in a place that is not painted, the other to each conclusion of the winding alternately. The value should be more than 0.5 MOM, a smaller indicator suggests that the engine must be dried. When conducting measurements, try not to touch the wires and be extremely careful. In order to avoid accidents, de.Energize the engine and strictly observe all precautions.

Now you know how to check the anchor of the electric motor by the tester, and you can, without involving a specialist, identify the cause of the problems and eliminate it by saving money and time.

To check the stator and rotor for the inter.Seal closure by a multimeter, it will not take much time. You have to disassemble the engine longer. Corner grinder, drill, peorator. Each tool can be repaired by determining the malfunction. The check is better to break into several main stages, and consistently slowly perform actions.

Dismantling of corner grinders

To check the closure at the stature and rotor, you need to disassemble the engine of the household tool. Consider the implementation of this operation to search for a malfunction of the corner grinder.

  • Remove the protective casing by unscrewing one screw on the clamp;
  • Unscrew 4 screws and disconnect the gearbox with the engine from the handle of the corner grinder;
  • Then, from the side of the gearbox, we unscrew 4 bolts and disconnect the gearbox, along with the engine rotor;
  • The stator has remained in the case connected to the power button and power.

Having dismantled and disconnecting the parts necessary for checking, we proceed to their external inspection for the intervaling check.

Visual inspection

A malfunction can be detected with 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 checked by the tester and other methods.

In case of short circuit of stator turns and the search for malfunctions, we are primarily inspection of the turns and conclusions. As a rule, when closed, the current force passing through the windings increases, and their overheating occurs.

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There is a greater short circuit in the stator windings and the insulation layer is damaged. Therefore, we begin to determine the malfunctions of a visual inspection. If there are no burns and damaged isolation, then we proceed to the following stage.

We have a red probe at the output output, the black probe is attached to the stator case. With a short circuit circuit, the resistance value will be smaller than on good. This malfunction requires rewinding the stator windings.

Possible tool malfunctions. We carry out repairs ourselves

If your tool has become worse, or completely stopped performing its direct duties, it is time to diagnose the malfunctions and try to cope with them. First, check the wire for damage and the voltage in the outlet, for which you can include any other device. TV or kettle.

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If you inspect the devices operating from the battery, they need to be checked when using a tester. In this case, the voltage indicated on the case must have a similar value with the battery voltage.

If the voltage is smaller, you will have to change the batteries to new. If the battery works normally, power supply is normal, look for problems in the hardware. The most common breakdowns are considered:

Knowing how the electric drill button is connected, you can quickly solve the malfunction. In addition, the problem with the work of the drill can occur due to the dustiness of the tool, because the drill “takes” the tree, and brick, and other materials. So, you should take care of cleaning the device after each use. The only way to reduce the risk of failures in work due to the contamination of the tool. That is why after you carried out repairs in the apartment, immediately clean the drill.

Application of a multimeter

Now we need to check the possibility of a break in the stator windings. On the multimeter scale, set the switch to the resistance measurement sector. Without knowing the size of the measurement, we set the maximum value for your device. We check the performance of the tester.

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Touch each other’s probes. The arrow of the device should show 0. We carry out work, touching the conclusions of the windings. When indicating an endless value on the multimeter scale, the winding is faulty and the stator should be put into rewind.

We check the possibility of short circuit on the case. Such a malfunction will cause a decrease in the power of the corner grinder, the possibility of electricity damage and increasing temperature, when operating. Work is carried out according to the same scheme. Turn on the resistance on the scale.

We have a red probe at the output output, the black probe is attached to the stator case. With a short circuit circuit, the resistance value will be smaller than on good. This malfunction requires rewinding the stator windings.

It is time to take measurements and check if there is an interval closing of the stator winding. For this, the resistance value on each winding is measured.

We determine the zero point of windings, measuring the resistance for each of them. When indicating on the device the least resistance of the winding, it should be changed.

Checking the stator and rotor of power tools for interval circuits

To check the stator and rotor for the inter.Seal closure by a multimeter, it will not take much time. You have to disassemble the engine longer. Corner grinder, drill, peorator. Each tool can be repaired by determining the malfunction. The check is better to break into several main stages, and consistently slowly perform actions.

Dismantling of corner grinders

To check the closure at the stature and rotor, you need to disassemble the engine of the household tool. Consider the implementation of this operation to search for a malfunction of the corner grinder.

  • Remove the protective casing by unscrewing one screw on the clamp;
  • Unscrew 4 screws and disconnect the gearbox with the engine from the handle of the corner grinder;
  • Then, from the side of the gearbox, we unscrew 4 bolts and disconnect the gearbox, along with the engine rotor;
  • The stator has remained in the case connected to the power button and power.

Having dismantled and disconnecting the parts necessary for checking, we proceed to their external inspection for the intervaling check.

Visual inspection

A malfunction can be detected with 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 checked by the tester and other methods.

In case of short circuit of stator turns and the search for malfunctions, we are primarily inspection of the turns and conclusions. As a rule, when closed, the current force passing through the windings increases, and their overheating occurs.

There is a greater short circuit in the stator windings and the insulation layer is damaged. Therefore, we begin to determine the malfunctions of a visual inspection. If there are no burns and damaged isolation, then we proceed to the following stage.

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

Application of a multimeter

Now we need to check the possibility of a break in the stator windings. On the multimeter scale, set the switch to the resistance measurement sector. Without knowing the size of the measurement, we set the maximum value for your device. We check the performance of the tester.

Touch each other’s probes. The arrow of the device should show 0. We carry out work, touching the conclusions of the windings. When indicating an endless value on the multimeter scale, the winding is faulty and the stator should be put into rewind.

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We check the possibility of short circuit on the case. Such a malfunction will cause a decrease in the power of the corner grinder, the possibility of electricity damage and increasing temperature, when operating. Work is carried out according to the same scheme. Turn on the resistance on the scale.

We have a red probe at the output output, the black probe is attached to the stator case. With a short circuit circuit, the resistance value will be smaller than on good. This malfunction requires rewinding the stator windings.

It is time to take measurements and check if there is an interval closing of the stator winding. For this, the resistance value on each winding is measured.

We determine the zero point of windings, measuring the resistance for each of them. When indicating on the device the least resistance of the winding, it should be changed.

Non.Standard check

The most accurate way is to check the stator using a metal ball and a lowering current transformer. The stator is connected to the conclusions of three phases from the transformer. Having checked the correctness of the connection, we turn on our circuit with a reduced voltage to the network.

We throw the ball into the stator and observe its behavior. If he “stuck” to one of the windings. This means that an interval circuit has occurred on it. The ball is spinning in a circle. The stator is working. Quite an unscientific, but effective method of detecting interval circuits at the status.

Rotor malfunctions

In the case of an optimal use mode, the rotor does not wear out. Regulatory work is carried out with the replacement of brushes with their wear. But over time, with strong loads, the stator heats up and the soil is formed. The most common mechanical breakdown is wear or bias of bearings.

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The corner grinder will work, but the plates quickly wear out, and over time the engine breaks. To avoid breakdowns, it is necessary to check the tool and maintain normal service conditions.

Moisture when it hits metal causes rust. The friction force increases, the current strength is required more for work. There is a significant heating of the contact groups, solder, a strong spark appears.

Checking the engine windings

Rotor electronic tester is a standard digital multimeter. Before proceeding to testing the closure, you should check the multimeter and its readiness to work. The switch is set to measure the resistance and touch each other’s probes. The device must show zeros. Set the maximum measurement value and conduct a check:

  • First you should check the rotor for a chain break. Touching a black probe to the contact ring, red should be rolled red. The arrow of the device went off scale, which means that the winding has a break in the circuit of the boots. The rotor should be given to rewind;
  • We measure the resistance to determine the possibility of short circuit on the case. We fasten the black probe on the contact ring, the red roller should be reinforced with red. In the case of a low indication of the resistance and sound signal, such an anchor must be given for repairs;
  • Carrying for a dialing for interval circuits of rotor turns. 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 checked a working device. All other values ​​on the scale mean a multimeter malfunction.

On this, the rotor check is completed. Once again, the main stages of determining the malfunction should be reminded. Before checking, an angular grinder or any other device should be de.Energized.

Before measurements, you should visually inspect the housings, isolation and lack of soils at the stature and rotor.

How to check the anchor on the generator

What to do if there is no light in the house? Help in solving the problem. But if this equipment is out of order and this equipment, the generator check will help to determine the malfunction with a multimeter. Regardless of the type and brand, with the help of this device, having learned the cause of the malfunction, you can carry out a simple repair yourself.

There are a lot of varieties of generators, from large and powerful industrial to small automobile devices. But the test algorithm using a tester is the same for any generator.

What nodes and details are checked using a multimeter

This operation provides for the diagnosis of the electric part, while the following parts are checked:

  • Voltage measurements are performed at the exit from the generator;
  • The winding winding is checked for the absence of a rupture of the chain, a short circuit to the housing;
  • Checking the stator windings on a breakdown and a chain break;
  • Detection of malfunctions of the diode bridge, capacitor;
  • Malfunctions of the voltage and brushes are revealed;

The implementation of each listed operation requires special knowledge and ability to carry out measurements, so you should consider each check in more detail.

Measurement of the output voltage level

For each individual unit, this value will be different. We will analyze in more detail the check of the car generator. We set the voltage measurement mode on the multimeter scale. First you need to check the voltage on the engine turned off for this, measure the value of the voltage at the battery terminals.

We connect the red probe to the plus terminal, we fix the black one minus. Charged, working battery will give a value up to 12.8 V. We start the engine. Then we measure. Now this value should be no more than 14.8V, but at least 13, 5 in. If the voltage level is higher or lower, the generator is faulty.

Check the rotor winding

To perform this operation, it is necessary to dismantle and disassemble the unit. When performing an independent check, do not forget to put the device in the measurement mode of the circuit resistance. Additionally, the value of the size is not higher than 200 Ohms. These regulations are carried out in 2 stages:

  • The resistance value of the rotor windings. To do this, we attach the probes to the rings of the mobile part of the engine, determine the value. This will make it possible to determine the likelihood of a gut of the winding circuit at a value of above 5 Ohms. If the device has shown less than 1.9 Ohms, there was a turning point. Most often the chain breaks in the places of connection of the output of the rotary winding to the ring. It is possible to determine the defect by stirring the wire in the rations, as well as when the darkened and crumbling insulation of the wires is detected. With a cliff and short circuit (short circuit), the wires are heated greatly, so the breakdown can be detected by visual control.
  • The chain (a short circuit is found for detecting a short circuit. The generator rotor is convenient for work. Then we bring one probe to the rotor shaft, we fasten the second to any ring. With a good winding, the resistance indication will go through. If you show small resistance, this part should be given to rewind. When rewinding the rotor, it is important to maintain the perfect balancing.

Checking the stator windings

Stator’s check begins with a visual inspection. We pay attention to external damage to the body and isolation, the place of burning of the wires at the KZ.

The unjust node should be given to rewind or replaced. With external integrity of wires, we begin to examine with the help of a tester.

Performing the work on checking the normal state of the node, we are convinced:

  • The integrity of the circuit of the windings. To do this, put the device in the resistance measurement mode. We fix the probes on the first pair of conclusions, then check the 1st winding and 3rd, 3rd and 2nd conclusions. If when the arrow of the analog device goes beyond the scale, it is necessary to rewind the windings.
  • In the absence of an interval short circuit and on the case. For this, one of the tips is connected to the conclusion, the second. To the body. If the windings are closed. On the scale there will be a lower resistance value than on good.

Identification of the malfunctions of the voltage regulator

Remove and disconnect the wires from the part. We examine the condition of the brushes. They should not have significant defects and chips. In the guide channels of the brush holder, the generator brushes should move freely. When performing them by the edge less than 5 mm, the generator regulator should be changed.

The check is made using batteries and a 12-volt bulb. The voltage of the second power source should be at least 15 in., Therefore, we consistently connect the batteries to the car battery and bring the value to the desired. Plus from the 1st power source we fasten to the output contact, we fix the minus to the mass.

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The bulb is installed between the brushes. When connecting source in 16 in. She shouldn’t burn. With a weaker battery, it burns. In case of violation of proper combustion, the regulator should be replaced.

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Checking the diode bridge and capacitor

The task of this node in preventing the passage of electricity to the generator. He must direct him from the generator to the consumer. Over, any deviation is a malfunction of the diode bridge. For verification, dismantle it and unscrew the conclusions on the generator. We exhibit the device for “call”.

To check the power diode, we bring the black probe to the bridge plate, we fasten the red to the output. When indicating a multimeter of 400-800 Ohms-the diode is working, other numbers require a replacement of a diode or bridge.

When checking the auxiliary diode, the operation is performed similarly. But when changing the probes in places, the device should show the meaning of the resistance of the striving for infinity.

When checking the polar capacitor, you need to remove the remaining charge. Then, on the scale, set the resistance. Contacts must be attached, observing the polarity. When measuring a working part, the resistance is gradually growing. Otherwise, when there is 0 on the screen, it should be replaced.

If a non.Polar capacitor is tested, MOM is set on a scale of values. The probes are placed on contacts regardless of polarity. Then, the resistance value should be measured. If the screen is less than 2 ohms on the screen, this is a faulty part.

How a malfunction diagnosis is carried out?

Checking the anchor of the electric motor begins with the determination of the malfunction itself. A complete breakdown of this node occurs due to the scattered brushes of the collector, the destruction of the dielectric layer between the plates, in addition due to the short circuit in the electronic circuit. If the sparking passage of the snuts of the device decides to wear out on a different damage to the current collectors.

Sparkling of brushes begins due to the occurrence of a gap at the point of contact with the collector. This is preceded by the fall of the device, the highest load on the shaft during jamming, also violation of the integrity of the solder on the conclusions of the windings.

Legend angle grinder INTERSKOL 125/900 sparked does not turn on

The malfunction on the working electric motor is manifested by the usual states:

  • Coming the main sign of malfunction.
  • Rock and friction when rotating the anchor.
  • Tangible vibration during operation.
  • Changing the direction of rotation when the anchor of the movement line passes the least turnover.
  • The occurrence of the aroma of melting plastic or severe heating.

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.

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. Passing direct cutter
  • We also need a reverse cone for centering in the bearing. Make a hole in it up to 8 mm.

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.

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.

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.

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.

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