Measure the quality of the motor

Measure the quality of the motor

Measuring the quality of a motor can be done through the following steps:

Insulation resistance test:

Measure the insulation resistance of the motor coil using an insulation resistance megohmmeter. Under normal circumstances, the insulation resistance should be greater than 0.5 megohms. If the insulation resistance is lower than this value, it may indicate that the motor insulation layer is damaged and further drying treatment is needed.

DC resistance test:

Measure the DC resistance of the three windings of the motor using the resistance range of a multimeter. In an ideal situation, the resistance values of the three windings should be the same or very close, with a deviation within 2%. If there is a significant difference in resistance values, it may indicate the presence of a turn to turn short circuit problem.

Mechanical performance inspection:

Manually rotate the shaft of the motor and check for any issues such as non movement or abnormal noise. At the same time, check the end cap and bearings, observe whether there is a phenomenon of "running out of the outer sleeve" or "running out of the inner sleeve", and whether the bearings are lacking oil or damaged.

No load power on test:

Turn on the motor without connecting the load, observe whether its operation is smooth, whether the three-phase current is balanced, and whether there are any abnormal sounds and temperature rises. If the motor runs smoothly, the current is balanced, and there are no abnormal sounds or temperature rises, then the motor is in good condition.

Special type motor testing:

For DC motors, in addition to the electrical and mechanical performance tests mentioned above, it is also necessary to check the status of the commutator and brushes.

For single-phase AC motors, in addition to routine testing, it is also necessary to check the quality of the capacitors.

Other detection methods:

Use vibration measuring instruments to conduct vibration tests on the motor and determine if there are any vibration faults.

Use sound testing equipment to conduct sound testing on the motor to determine if there is a noise fault.

Use an infrared thermometer or contact thermometer to measure the temperature of the motor casing, compare the measurement results with the normal operating temperature range of the motor, and determine whether there is overheating.

Through the above steps, the electrical performance, mechanical performance, and temperature condition of the motor can be comprehensively evaluated to determine its quality. It is recommended to combine multiple detection methods in practical operation to ensure accurate judgment of the motor's status.