What items do I need to check to purchase a three-phase AC motor?

Update:08-03-2019
Summary:

[Guide] Three-phase AC asynchronous motor is a kind of […]

[Guide] Three-phase AC asynchronous motor is a kind of electric drive device that converts electrical energy into mechanical energy. It consists mainly of the stator, the rotor and the air gap between them. After the stator winding leads to the three-phase AC power supply, a rotating magnetic field is generated and the rotor is cut to obtain the torque.
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A three-phase asynchronous motor is an electric drive that converts electrical energy into mechanical energy. It consists mainly of the stator, the rotor and the air gap between them. After the stator winding is connected to the three-phase AC power source, a rotating magnetic field is generated and the rotor is cut to obtain torque. The three-phase asynchronous motor has the advantages of simple structure, reliable operation, low price, strong overload capability, convenient use, installation and maintenance, and is widely used in various fields.

What items do I need to check to purchase a three-phase AC motor?

What items do I need to check to purchase a three-phase AC motor?

1. Shake the table and shake the table with 500V. Shake the insulation resistance of the wire on the three terminals to the motor casing. It should be above 0.5M, indicating that there is no short circuit to the ground (Yantai motor maintenance).

2, multimeter test: measure the resistance of A / B / C three-phase, whether it is equal, should be similar, too much difference can also turn, but not long, remember that the larger the motor, the smaller the resistance! But Can not be three-phase are 0 ohms, unless you are particularly large, such as 50KW or more motors! Remember that if the speed of the 6 terminals of the speed control motor can be different!

3, check the bearings, fans, the general wrapped around the motor will be replaced! Because sometimes the bearing lock will burn the motor!

4. The no-load current of the motor is generally 10% to 50% of the rated current. Sometimes the motor idle current 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, indicating that the motor output power is small and it is light load operation.