# Advice 1: How to check the motor windings

The motors on the car can perform a variety of functions. They trigger the windshield wipers and the window, push the sunroof, allow you to operate the locks with the Central management. If the motor has stopped working, then perhaps the reason lies in the violation of the integrity of its windings. To check the windings, there are special techniques and devices.
You will need
• - megger.
Instruction
1
With the help of megger check the insulation resistance of the motor winding between the housing and the phases. To do this, first remove the jumpers on the terminal block of the motor (they can be made of the type "star" or "triangle"). Check the terminal block, closing it on the body and between the mounting bolts of the connection pins.
2
The slip ring motor will carry out a visual check insulation of brush holders and slip rings.
3
The motors with rated voltage of 127V at least check the insulation, designed for 500V. If the nominal voltage is higher, will require megger at 1000V.
4
If the results of the test winding relative to the housing and between phases measurement results differ significantly, the engine should be repaired or replaced. Most likely, it runs on two phases. Should be considered faulty motor, if the winding insulation resistance less than 1mω.
5
To check for interturn short circuits use special equipment as a conventional ohmmeter, even digital, will show the difference between the windings only when a clear and already visible to the eye of a short circuit in the coils.
6
To measure the winding with a low resistance to pass through it a steady current from the battery. By adjusting a rheostat set the current of 0.5-3.0 A. After installation, current to the end of the measurements do not change the position of the rheostat.
7
Now measure the voltage drop and current, and then calculate the resistance of the winding according to the formula R = U/I (where R is the resistance, U – voltage and I – current). The resistance of the winding shall not differ by more than 3%. This method is suitable and to check the commutator motor.
8
In some cases, determine that a three-phase motor operates on two phases, it is possible by visual inspection. The symptom is the darkening of the "frontal" part of only those coils that have voltage.
"Repair of electric motors. The benefit to the electrician," N. To. Mandych, 1989.
"Electric motor repair", S. A. Mandrykin, 1983.

# Advice 2: How to check the windings in the motor

Many devices and mechanisms of the car are driven by electric motors. To all of the systems working smoothly, it is necessary to maintain the engine in operating condition, conducting periodic prevention and inspection. This will allow time to identify and troubleshoot which devices. One of the potential problems in the electricengine is an open in the winding.
You will need
• - screwdriver;
• - wrenches;
• - ohmmeter;
• calculator.
Instruction
1
Perform a visual inspection of the motor and its windings. In many cases, quite carefully inspect the device to detect traces of soot or place of breakdown of winding. If a three phase motor running on just two phases, this will be indicated by the darkening in front of the coils to which voltage is applied.
2
A motor with a wound rotor inspect for damage kontaktnyh rings and brush holders.
3
Prepare an ohmmeter and check with the help of this device the insulation resistance and the resistance between the phases and the casing of the engine. Before taking measurements, remove the jumpers from the motor terminals. Snap the terminal block onto the housing and measure the resistance value between the bolts that secure conclusions. If parameters other than stated in the technical documentation, the motor winding is faulty.
4
Motors with a standard voltage or lower, use an ohmmeter to measure, designed for voltages up to 500V. If you check a higher voltage you will need a device with voltage up to 1kV.
5
A sign of a faulty coil is the discrepancy between the results of measurements of resistance between the phases and relative to the housing of the device. If the insulation resistance is less than 1 Mω, this indicates a malfunction of the motor. In this case, replace the coil or entire engine.
6
You should not use an ordinary ohmmeter to check for interturn short circuits, because such a device will show the difference in the resistance only when a short circuit in the coils and so apparently on the eyes. To conduct these measurements use special equipment commonly available in auto repair shops.
7
For measuring windinghaving low resistance, flow through the coil current from the battery. Current should be in the range from 0.5 A to 3.0 A. the amperage should be the same throughout the measurements. To calculate the resistance of the winding using the following formula:R = U / I; гдеR – resistance winding;U – voltage;I – current.The difference of the resistance of the windings from that specified in the technical documentation should not correct the engine and secure the coil to exceed three percent.

# Advice 3: How to determine the starting winding

If you have a junk engine, for example, from the washing machine, you can collect useful and necessary in the economy of the device. You only need to connect it.
You will need
• - the device for definition of resistance.
Instruction
1
In order to start the engine, determine insights starting and working winding. Use your existing devices – tester, ohmmeter, etc. Take any engine and connect it to one of the probe device. With the second pair look for the output of the engine. Simply connect the probe alternately to each of the three remaining wires. If the device showed the presence of some resistance, record the value and note the twin insights.
2
Obviously, the remaining two wires – insights second obkatki engine. You need to determine which one is starting, and what is working. Measure the resistance at the second pair of conclusions. Compare with the first value. The resistance of the starting winding is always greater than working. Now you can find the diagram to start the engine.
3
Another possible situation. You have a single phase motor. He also has two windings. But wires not four, but only three. This suggests that one output of each winding connected inside the motor. In this case, you need to know how the engine worked formerly with the starting relay or capacitor.
4
Measure the resistance between terminals. There are three possible combinations: 1-2, 2-3, 1-3 . For example, you have determined that the greatest resistance is a couple of insights 1-3. It is known that the working winding has its least value compared with the starting or condenser. Hence, the General conclusion is that the 2. It will be included directly in the network.
5
Identify the pair with the lowest resistance value. In this particular case the 1-2 combination. Output 1 is also connected to the network. It must be connected in the wire 3.
6
The following options are possible: the first auxiliary winding having a terminal 3 is launcher. Second it is the capacitor. In the first case the connection will take place only during start-up. In the second, it is carried out consistently through the condenser.

# Advice 4: How to check the winding of the generator

To check the generating system and troubleshoot it enough to have an ohmmeter. However, more precise information about the wrapping nodes can be obtained by using special devices that search for faults in the windings by comparing their parameters with a known good coil. They are suitable for Troubleshooting as the stator windings and excitation.
You will need
• An ohmmeter, a device PDO-1
Instruction
1
Check the winding of the rotor. To do this, turn on the ohmmeter to measure winding resistance and bring his findings to the rings of the rotor. Resistance serviceable rotor when voltage of 14 V is in the range of: generators that operate with voltage regulators designed for a maximum amperage of 3.5—4.0 And Is 3-5 Ohms, working with voltage regulators that are rated for the amperage And 5 - 2,5—3 Ohms.If the device showed infinite resistance, this means that the circuit of the field winding is broken. This usually occurs in the soldering of conclusions of a winding to the rings, when burned windings or when turning of the frame with the excitation winding on the pole half-sleeves-half. Also this is evidenced by the darkening and also shedding its isolation that can be detected visually. This fault leads to inter-turn short circuit in the winding, which is accompanied by a decrease in the overall resistance.To determine the partial winding short circuit when the resistance of the windings varies little, only a special device, such as PDO-1. When this occurs, the comparison of this coil with a known good. The excitation coil of the contactless generators (HA2, 955.3701) test using an ohmmeter, pin the ends of which are connected directly to the terminals of winding. Then check the no short to ground. To do this, one lead of the ohmmeter to bring his beak, and the other to any ring rotor, and the non — contact generators to the hub of the coil and any output coil. A good coil should show a gap on the ohmmeter, i.e. infinite ohms.
2
Check the stator winding. To do this, attach the ends of the ohmmeter to one terminal of the winding and package of iron, i.e., check for a short to ground. The device is a healthy coil should show an open circuit. Check winding short circuit in the stator windings. To do this, measure the resistance of the individual phases and compare the results with each other, the difference should not be more than 10%. The resistance phase is a fraction of an Ohm, so it requires high-precision measurement devices.Full information on the state of the windings of the generator can provide the device PDO-1, connected to the terminals of the three phases. When the phases are identical, the screen has one oscillographic curve, if not (due to inter-turn short circuit in phase) then the two curves. The measurement should be repeated, pre-change phase places. Thus you can find the different phases, for example, a different number of turns in them that can occur after rewinding the stator. Phase loss check with ohmmeter by connecting it alternately to the zero point and to the conclusion of each phase.
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