How to use a multimeter to measure whether a motor burns out or breaks down??? To be specific, I m a

Friend, first use the resistance gear of the multimeter by 10k gear to measure the insulation resistance of the motor binding post to the ground, if it is very large, then the motor is not grounded, if it is very small, then the motor winding coil or lead wire is grounded, that is, burned. In addition, use the multimeter resistance gear by 1 gear to measure the resistance between the windings of each phase of the binding post, if the resistance is very low, and the three phases are not the same, then it means that there is a breakdown phenomenon in the winding, if they are almost the same, then it means that it is good.

Burn out to measure the resistance value of each group of coils!! The higher the resistance, the proof is broken.

The breakdown is used to measure the resistance to the ground, and the resistance value is measured by each group and the motor shell. The smaller the resistance, the more you wear it.

Its practical multimeter measurement is not very accurate, and it is more accurate to use a shake meter.

You use the resistance file of the multimeter to measure, U1---V2, V1---W2, W1---U2 whether it is a path, if one of them is not through, it means that a coil is burned out, pay attention; The sequence of the measuring wire head group is wrong. Whether it is broken down, you only need to measure the U1, V1, W1, or U2, the three heads are measured with the motor shell, if the path, it means that the breakdown is not normal, and the multimeter is also a resistance file.

Hello. If tested with a universal meter: the resistance of each winding should be basically equal. Of course, it is difficult to judge and test the local short circuit in a group with a universal meter. It is recommended to use a 500 1000V shake meter to test the insulation resistance. 3

Insulation between groups, under normal circumstances, a resistance of more than 1m can be used normally. Of course, the greater the insulation resistance, the better. Ha ha.

Use the high resistance gear to measure the resistance value of the relative shell and the relative phase, and use the low resistance gear to measure the resistance value of each phase line to see whether it is balanced, whether it burns out and smells.

The motor that has burned out is judged by how to measure it with a multimeter.

I am the social loss of the people's livelihood Xiaoqin, I am honored to answer for you: dear, hello! The multimeter can be used to detect if the motor is burned out, which can be done by following these steps:

1.Select the voltage measurement setting. Rotate the multimeter to the alternating current (AC) or direct current (DC) voltage measurement setting.

2.Measure the supply voltage of the motor. Turn on the power supply, connect the two test pens to the two electrodes of the electric car machine respectively, and measure the power supply voltage of the motor.

If the motor is operating normally, the supply voltage should be within its rated value, otherwise there may be a fault. 3.Check whether the windings of the motor are short-circuited.

In the resistance measurement gear, connect the two test pens to the two electrodes of the motor respectively to detect the winding resistance value of the motor. If there is a short circuit in the windings of the motor, the resistance value will be smaller. 4.

Check whether the windings of the motor are open. Also in the resistance measurement setting, a test pen is sailed and attached to one end of the motor, while the other pen is moved back and forth on the windings of the motor, and if the reading is always infinity, the windings of the motor may have an open circuit fault. 5.

Check whether the windings of the motor are reversed. On the AC voltage measurement setting, plug the black cable from the test pen into the "com" jack of the multimeter and the red cable into the "v" jack. Then plug the red cable into one pole of the AC power supply and the black cable into the other pole of the power supply, if the measured voltage is opposite to the rated voltage of the motor, it means that the motor has been reversed in winding.

When detecting motor faults, we should choose appropriate test methods according to different types of motors and specific fault performance to achieve the effect of accurate diagnosis. 

The analysis is as follows:

1. First of all, measure the resistance of each relative ground separately to see if there is leakage.

2. Then, measure the resistance of each phase separately to see if it is burned out or short-circuited between turns.

3. Finally, measure the phase-to-phase resistance between the three phases to check whether there is a phase-to-phase shortness.

Multimeter measurement: measure the resistance value between the three phases of a, b and c, whether it is equal, it should be about the same, and the difference is too much to turn, but it will not take long, remember that the larger the motor, the smaller the resistance. But you can't all three phases be 0 ohms, unless you are particularly large, such as a motor above 50kw.

Keep in mind that if it is a speed regulating motor, the resistance value of the 6 terminals is not the same.

Use a multimeter to test whether the motor is damaged, and judge some motors that are out of phase and burned. Measure three-phase motors, such as three-phase winding resistance unbalance.

Because the power supply used in the multimeter for measuring resistors is up to 9V, while the motor is operating at an AC voltage of 220V or 380V, the pulse peak wave reaches more than 500 volts.

Judging the quality of the motor is usually measured by the multimeter resistance gear to measure whether the motor winding is short-circuited (inter-turn short circuit), open circuit, grounding and confirm whether the resistance value of the three-phase winding is balanced, but the high-power motor multimeter can only measure the motor winding circuit and grounding, and the measurement resistance value to the ground is less than 5 megaohms is regarded as grounding (empirical value).

The motor that has burned out is judged by how to measure it with a multimeter.

Use a multimeter to measure the motor, no matter whether the resistance value of its windings is large or small, as long as the resistance value of the three-phase windings is the same, not short-circuited with each other, continuous circuit, and not grounded, it is good, otherwise it is bad.

Another point is that the motor may be grounded after burning, and the insulation of the coil is damaged and the iron core of the motor is in contact, which is to hit the shell. Not every motor is like this, though.

The first measure whether the winding is on/off, if you don't know whether the resistivity of the motor is directly hit in the resistance gear 10 or 100, then it will not burn out, and if it is not passed, it will be burned.

The second measurement is whether it is grounded, because the motor burns out, and sometimes it is also accompanied by grounding Hit 1k or 10k two meters, one end of the pen contacts the wire, and the other end of the contact case pointer does not move, then it is intact, and if it moves and the amplitude is very large, it is not good.

Thirdly, if the motor is three-phase, you can measure whether the resistance of the three-phase winding is balanced.

If it is a one-way motor, measure the two incoming wires of the motor directly with the ohm gear, and if the resistance is infinite, it will burn out. If it is a three-phase motor, use the ohm range to measure the AB term AC term and BC term respectively, if any of the resistance is infinite, it means that the motor has burned out.

Measure it with 20k, if it's infinity, it's the motor burned.

The positive and negative poles of the motor can be measured directly with the ohmic gear.

According to experience, the degree of burnout of the motor is different, and in general, the degree of burnout is more obvious and can be measured with a multimeter. The specific method is to open the end cover of the motor, first measure the on-off situation of the motor winding, first hit the multimeter to the lower level of the resistance file, such as 1, and measure whether the windings are complete, and the terminals of each winding should be the same as the star point, that is, the resistance value of the multimeter is small. In the triangular connection method, the three windings should communicate with each other, that is, the resistance between the terminals of the three windings measured by the multimeter should be small, which indicates that the connection of the three windings is intact.

If the measured resistance value is very large, it means that the windings of the motor have been burned out, and it can basically be judged that the motor has been burned. If the windings are well connected, it is time to measure the insulation of the motor. First put the resistance of the multimeter in a higher gear, such as 1m, and then measure the resistance between each winding and the motor housing, if the resistance is relatively small, it means that the insulation of the motor has been destroyed.

If the measured resistance value is not very small, it is difficult to use a multimeter to judge the burnout of the motor, in this case, it is necessary to use a megohmmeter to measure the quality of the motor.

1. Measurement method of three-phase motor.

Hit the multimeter to the 200 ohm stop of the resistor. Measure the three-phase resistance value separately, generally the resistance value of the 750 watt motor is about 20 ohms, and the resistance value of the 4000 watt motor is 3 5 ohms, and the resistance value is slightly different according to the different motors. If the resistance value of the three phases is the same and the difference is not large, it can be preliminarily judged that the three-phase winding is basically normal and there is no inter-turn short circuit.

Then, disassemble the three-phase short-circuit piece of the junction box, (except for the short-circuit of one end of the three-phase directly connected to the motor winding of some low-power motors), hit the multimeter to 20m ohm, and measure the insulation resistance between the three phases and the three-phase shell, and its resistance should be infinite. Because the power battery of the multimeter is nine-volt. It can only be preliminarily judged its insulation resistance value.

The size of the specific insulation resistance value needs to be measured with a 500 volt shake meter, and the insulation resistance value is normal if it is more than 5m. The above is the judgment of the motor under normal conditions.

If the three-phase resistance value is different, and the resistance value is zero or no resistance value, it can be basically determined that the motor has been burned or out of phase, and the motor needs to be disassembled for further inspection. If the insulation resistance value is small, it is necessary to judge whether it is a short circuit or moisture.

2. Measurement of single-phase motors.

The measurement of single-phase motors and three-phase motors is similar, single-phase motors only have main windings and auxiliary windings, and the resistance values of main windings U1 and U2 and secondary windings Z1 and Z2 are measured. Generally, the resistance value of the secondary winding is greater than that of the main winding, but there are also the same resistance values of the main winding and the secondary winding. If the resistance value is normal, remove the connecting tab.

Measure the insulation resistance between the main and secondary windings and the insulation resistance to the housing. The measurement method is the same as that of a three-phase motor.

The multimeter resistance file, every two phases of the measurement, if the resistance is very large or not through, it may be burned off, and then each binding post and the motor shell to measure, if the path, the motor winding has been burned out.