Synchronous motor starts to oscillate, how to solve the problem when synchronous motor starts?

The synchronous motor starts to oscillate, which solves the oscillation problem when the synchronous motor starts.

Synchronous motor is a common motor, which has the advantages of high efficiency, stability and reliability, and is widely used in various fields. However, during the starting process, the synchronous motor often oscillates, which will not only affect the performance of the motor, but also affect the normal operation of the equipment. Therefore, how to solve the vibration problem of synchronous motor when starting has become the focus of many electrical engineers.

First, the causes of synchronous motor start-up shock

The reason of synchronous motor start-up oscillation is mainly caused by insufficient torque when the motor starts. When the motor is started, there is a relative motion between the flux on the rotor and the flux on the stator due to the different relative positions between the rotor and the stator. When the motor speed reaches the synchronous speed, the relative position between the rotor and stator will not change, and the motor will enter the normal working state. However, in the process of starting the motor, due to the relative motion between the flux on the rotor and the flux on the stator, a torque caused by magnetic resistance will be generated, which is not constant, but changes with the change of motor speed. Therefore, when the speed of the motor is lower than the synchronous speed, the torque is insufficient and the motor will oscillate.

Second, solve the vibration problem when the synchronous motor is started.

In order to solve the vibration problem when the synchronous motor is started, the following methods can be adopted:

1. Increase the starting torque

In order to increase the starting torque of the motor, direct starting method, star triangle starting method, self-coupling starting method and other methods can be adopted, which can provide larger starting torque when starting.

2. Adjust the mechanical parameters of the motor

The mechanical parameters of the motor include rotor inertia, no-load speed of the motor, etc. By adjusting these parameters, the torque can be increased when the motor is started.

3. Adopt flexible starter

Flexible starter is a kind of equipment that can provide soft starting torque. It can control the starting torque of motor by adjusting the size and waveform of starting current.

4. Adopt frequency converter control.

Frequency converter is a kind of equipment that can control the speed and torque of motor. By adjusting the output frequency and voltage of frequency converter, the motor can be started softly and stopped smoothly.

Starting oscillation of synchronous motor is a common problem, but this problem can be effectively solved by adopting the above methods. In practical application, appropriate methods should be selected according to specific conditions, so as to ensure the normal operation and performance of synchronous motors.