What causes a motor with a frequency converter to vibrate?
When using a motor driven by a frequency converter, motor vibration may sometimes occur. Excessive vibration may burn out the motor and cause incalculable losses.
So what causes this phenomenon?
Image from Industrial Control Forum
1. The motor is damaged, resulting in a phase loss, or there is poor contact in the signal line.
2. The load is too large relative to the current, making it difficult for the motor to start.
3. The jumping frequency being the same as the inverter's output frequency causes resonance.
The following methods can be used to address these issues.
1. Disconnect the load, power on and run the circuit to check for any problems with the motor. For poor signal line contact, use distributed wiring to avoid wires getting tangled together. Use twisted-pair shielded cables for control signal lines and detector connections.
2. Install the reactor. The wiring diagram is as follows:
Image from Industrial Control Forum
3. To address the vibration caused by mechanical resonance, the output current (torque) fluctuation can be reduced by changing the output frequency, thereby mitigating the vibration.
