How to check the quality of the motor, how to judge the quality of the motor

Measurement method of motor quality:1. Check whether the insulation resistance of the motor coil is greater than the megaohm, if it is greater than the megaohm, it means that the insulation performance of the motor is good;

2. Use the multimeter resistance file to test whether the DC resistance of the 3 windings of the motor is the same, if it is the same or the size deviation of the DC resistance of the 3 windings is very small, it means that there is no inter-turn short circuit between the coils of the 3 windings;

3. Manually rotate the shaft of the motor, and check whether there is any disc immobility, abnormal noise, etc.

4. Check the quality of the motor, check whether the insulation resistance of the motor coil is greater than the megaohm with the insulation resistance shake table, if it is greater than the megaohm, it means that the insulation performance of the motor is good.

To check the quality of the motor, step 1, use insulation resistor.

Shake the table to check whether the insulation resistance of the motor coil is greater than the megaohm, if it is greater than the megaohm, it means that the insulation performance of the motor is good; Step 2: Use a multimeter.

If it is the same or the deviation of the DC resistance of the 3 windings is very small, it means that there is no inter-turn short circuit between the coils of the 3 windings; Step 3, manually rotate the shaft of the motor, check whether there is no movement, abnormal noise, etc., the fourth step, is no-load energized, check whether the 3-phase current of the motor is balanced, whether the motor runs smoothly, temperature rise, abnormal noise, etc., after the above 4 steps of inspection if it is normal, then the motor is good.

Check the quality of the motor, first of all, use the megohm meter to measure whether the insulation resistance of a relative ground, b relative to the ground, and c relative ground is greater than the megaohm, if it is greater than the megaohm, it means that the insulation performance of the motor is good; Then, use the multimeter resistance gear to test whether the resistance of the 3 coil windings of the motor is the same, if the same or the electricity of the 3 coil windings.

The magnitude deviation of the resistance is very small, which means that there is no inter-turn short circuit between the coil windings; Secondly, manually rotate the shaft of the motor, check whether there is no disc immobility, abnormal noise, etc., finally, it is no-load energized, check whether the 3-phase current of the motor is balanced with a clamp meter, whether the motor runs smoothly, temperature rise, abnormal noise, etc.;

How long does the motor run continuously, and how many degrees does the temperature reach If the temperature exceeds the guaranteed temperature of the manual, it means that it is broken

1. How to test the quality of AC three-phase motor?

1. Shake the meter, 500V can shake the meter, and shake the insulation resistance of the wire on the three binding posts to the motor shell, which should be above Europe, indicating that there is no short circuit to the ground.

2. Multimeter measurement: measure the resistance between the three phases of ab c, whether it is equal, it should be about the same, and the difference is too much, 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!

Remember, if it is a speed regulating motor, the resistance value of the 6 terminals is not the same!

3. Check the bearings and fans, and generally wrap the motor to let them all be replaced! Because sometimes the bearing will burn the motor!

4. The no-load current of the motor is generally 10% to 50% of the rated current, and sometimes the idling current of the motor is still zero!

5. When the rated current of the motor is running, it is running at full load, and the output power is basically 100%. The running current is small, which means that the output power of the motor becomes smaller, and it is a light load operation.

2. How to detect the quality of AC single-phase motor?

Use a 500V megohmmeter to measure the insulation resistance of the motor winding and the shell, which should not be less than the megohm; Use a multimeter to measure each lead wire of the winding, and there is no broken wire; All of the above meet the requirements, and the motor is good.

It is more convenient to use a pointer multimeter to detect the quality of the capacitor (there is also a digital meter with a capacitance file, which can be measured directly).

It is good to dial the multimeter to the 1k or 10k resistance level, measure the 2 leads of the capacitor, and slowly return to the left capacitor after the meter needle is quickly deflected to the right; Always biased to the right indicates that the capacitor is broken; If the pointer does not move, the capacitor will be disconnected or the capacitance will be gone. In this way, only the quality of the capacitor can be judged.

Three. Is a DC motor good or bad?

First see if there is a broken wire and measure whether the resistance is normal.

If it is a brushed DC motor, the rotor can be rotated and the output DC can be measured with a multimeter to see if the output DC is normal.

If it is a brushless DC motor and the three-phase is drawn, the rotor can be rotated, and the multimeter is used to measure whether the output alternating voltage is normal.

The output voltage is proportional to the rotational speed.