Two major reasons for the noise of the inverter drive motor
When the motor is driven by the inverter, we often encounter a situation where the motor is noisy. Motor noise is no different than two reasons: mechanical and electrical.
1, mechanical aspects
If the motor cooling fan is damaged or the motor casing is scraped, the motor is not stable. This situation is better handled, as long as the noise source can be found, it is generally handled.
2, electrical aspects
(1) The inverter carrier frequency setting is too low
The carrier frequency can be set higher, but this will cause some problems. If the carrier frequency is adjusted too high, it will cause interference to other devices, especially when using PLC communication. Therefore, the carrier frequency should be set according to the actual situation on site.
(2) Motor resonance
Sometimes, the motor generates mechanical resonance in a certain frequency band during operation. At this time, you can use the frequency hopping setting method of the inverter. Generally, the inverter has a “frequency hopping” setting, which is used to set the frequency of the motor resonance. When the inverter runs to this frequency band, skip this frequency to avoid resonance of the motor.
(3) Motor with reduced load capacity
Sometimes the motor will be used for a long time, or the motor quality will be poor, and the load capacity will be reduced. The noise of the motor here will also be larger than normal.
(4) The inverter has higher harmonics
When the high-order harmonic components of the inverter are large, the motor vibration is likely to increase, the rotation speed is jittery, unstable, and the motor noise is increased. Here, AC (input side) and DC (output side) reactors are installed.
