Shijiazhuang Pump Factory: Can a regular motor be controlled by a frequency inverter?

The power source for a slurry pump is typically an electric motor. We all know that the frequency of a motor is fixed at 50Hz and the speed is constant. However, sometimes we need to adjust the frequency to match the speed of the motor and pump. We know that variable frequency motors can be controlled by a frequency inverter, but can a regular motor be frequency-controlled by a frequency inverter? The answer is yes, although regular motors can be frequency-controlled by a frequency inverter, it is generally not recommended by motor manufacturers because it can easily lead to motor burnout. Regular motors were not designed for variable frequency speed control. Therefore, the impedance of a regular motor is not ideal for this purpose. Furthermore, when a regular motor operates at low frequencies, it runs at a constant torque. Since the motor current does not change significantly, the motor’s heat generation does not decrease. The cooling airflow of the motor is proportional to the cube of the speed. Therefore, as the speed decreases, the cooling performance of the motor worsens, causing the temperature of the motor to rise and potentially leading to motor damage.

On the other hand, variable frequency motors are equipped with air cooling devices to improve their cooling performance. Therefore, if you want to control the motor speed using a frequency inverter, it is more appropriate to use a variable frequency motor.