How to deal with the shaking when the inverter drives the motor?

The motor sometimes shakes when running with inverters. This will influence the normal running, the productivity and equipment lifetime.To ensure stable and efficient operation of the motor,we need to know what happened and how to solve it.

Ⅰ.Reasons

1. Power problems

Unstable power supply voltage or poor power line quality is one of the common causes of motor jitter during operation.

When the power supply voltage fluctuates greatly, the inverter may not be able to stabilize the output voltage at the required frequency which leads to unstable motor speed and jitter.

2. Motor issues

The motor has problems such as unbalance or uneven magnetic field which may also lead to jerks during operation.

3. Parameter setting problems

Irrational parameter settings of the frequency converter may also lead to shake  when the motor is running. For example, acceleration time, deceleration time, maximum frequency and other parameters are not set properly.

4. Control logic problems

There are problems with the control logic of the frequency converter, such as the speed regulation link is not reasonable. In addition, if the frequency converter fails to fully consider the characteristics and changes of the load when controlling the motor, it may also lead to motor jitter.

5. Load problem

The instability of the load can affect the stability of the motor's operation.

6. Fault problem

Faults in the frequency inverter or the motor itself, such as  the motor bearings damage,  faults, etc.

Ⅱ.Solutions

1. Check the power supply

Check whether the power supply voltage and frequency are stable and whether the power supply line quality is good. If there are problems with the power supply, it is necessary to replace the power supply, increase the voltage regulator, etc. to ensure that the power supply voltage and frequency are stable.

2. Regularly check the motor

Regularly check the running status of the motor to find and repair motor problems. For example, the motor rotor  balance, repair the uneven magnetic field and other problems to ensure the normal operation of the internal parts of the motor.

3. Reasonable setting of parameters

According to the characteristics of the motor and working requirements, set the parameters of the inverter reasonably. For example, adjust the acceleration time and deceleration time according to the load characteristics, and adjust the maximum frequency according to the working requirements.

4. Optimize the control logic

Check the control logic of the frequency converter and optimize the parameter settings of the speed regulation link. For example, adjust the proportional gain and integration time of the speed regulation link according to the actual needs to improve the stability and accuracy of control. In addition, the cha acteristics and changes of the load should be fully considered to ensure that the frequency converter can stably control the motor operation.

5. Add stabilizing device

According to the needs, increase the deceleration device, install stabilizer, etc., to improve the stability of the load. By installing stabilizers, the impact of load fluctuations on motor operation can be reduced, reducing the possibility of motor jitter.

6. Setting the jump frequency

When the motor resonates, the resonance point can be avoided by setting the jump frequency of the inverter. For example, set a certain frequency range as the jump frequency, inverter in the range does not output frequency, so as to avoid the motor in the resonance point operation.

7. Handling high harmonics of power supply

High harmonics in the power supply may lead to unstable motor operation. Installing reactors in the power supply system can filter out high harmonics, improve the quality of power supply and reduce the impact of harmonics on motor operation.

8.Disperse power and signal lines

In order to reduce the noise generated by the frequency converter on the motor operation of the interference, you can take measures to decentralize the power line and signal line. The use of shielded wire can reduce electromagnetic interference and improve the stability of signal transmission. Installation of surge suppressors and data line filters. Installing surge suppressors and data line filters where needed can further reduce the effects of electromagnetic interference and noise and improve the stability of motor operation.