Why does the DC vibration motor make noise?

The brushless DC vibration motor is a new type of vibration drive device that uses the eccentric blocks installed at both ends of the rotor of a special dual-shaft three-phase asynchronous motor to provide vibration force. It is widely used as the excitation source of various vibrating machinery (such as vibrating feeder, vibrating conveyor, vibrating screener, vibrating shakeout, vibrating crusher, vibrating hoist, vibrating test bench, etc.) Used as a warehouse wall vibrator (silo wall rapper).

DC vibration motor
Vibration motor

What Causes the Vibration Motor to Leak?

What causes the vibration motor to leak? The vibration motor is to install a set of adjustable eccentric blocks at both ends of the rotor shaft, and use the centrifugal force generated by the high-speed rotation of the shaft and the eccentric blocks to obtain the exciting force. The vibration frequency range of the vibration motor is large, and the mechanical noise can be reduced only when the excitation force and power are properly matched. Vibration machinery and equipment all use vibration motor as vibration source, and its speed and power are very controllable.

How to Solve the Vibration Motor Drive Problem?

We believe that the compressor torque fluctuations cause speed fluctuations in the motor, which lead to current fluctuations being generated by the motor and sent to the VFD. The VFD then amplifies the current fluctuations which cause larger speed fluctuations (another way of saying torsional vibrations) in the motor. The flywheel apparently isolates the compressor from the torsional vibrations (torque fluctuations) coming from the motor. It was originally installed to isolate the motor from torque fluctuations coming from the compressor.