What are the common problems encountered when using frequency converters in power YE3 motors?

A frequency converter is a device that converts power at the power frequency into power at other frequencies. The power frequency in our country is 50Hz. In the field of YE3 motors, in order to change the speed or other performance changes of YE3 motors, many YE3 motors use frequency converters for power supply.

The frequency converter is a conversion device used in conjunction with the YE3 motor. In terms of circuit configuration, the frequency converter is located between the YE3 motor and the power supply. YE3 motors with different load characteristics should be matched with frequency converters of different performance.

Taking asynchronous motors as an example, the torque of the motor is the result of the interaction between the magnetic flux of the motor and the rotor current. Taking the rated frequency as the boundary, if the input voltage of YE3 motor is kept constant when reducing the power frequency, the magnetic flux of YE3 motor will saturate, and in severe cases, the YE3 motor winding will be burned Therefore, when reducing the power frequency, the input voltage of the motor should be reduced at the same time, and the principle is to control the magnetic flux of the motor to remain constant. This control method is generally applicable to the load of fans and pumps.

For power frequency YE3 motors, if the voltage is lower than the rated voltage, the current of the YE3 motor will increase significantly with the same power output. Especially for YE3 motors running on temporary lines, the problem of winding burnout caused by this can be particularly serious. So, for YE3 motors powered by frequency converters, if low-speed output of the same power is required, that is, constant power operation, the current will also increase. However, if the YE3 motor is in constant torque operation, the current of the YE3 motor will not change significantly.