Is The Motor Add A Inverter Could Be A VF Motor?

Indeed, a motor add frequency converter, it is possible to achieve variable frequency operation, but it is not a real variable frequency motor.

1.The influence of inverter on the motor, is mainly on the efficiency and temperature rise of the motor:

The inverter can generate different levels of harmonic voltage and current during operation, so that the motor runs under non-sinusoidal voltage and current. The higher harmonics inside will cause the stator copper loss, rotor copper loss, iron loss and additional loss of the motor. The most notable is the copper loss of the rotor. These losses will cause additional heating of the motor, reduce the efficiency, and reduce the output power. The temperature rise of motor generally increases by 10%-20%.is-the-motor-add-a-inverter-could-be-a-vf-motor

2.The problem of Motor dielectric strength:

The carrier frequency of the inverter is from several to a dozen kilohertz, which makes the stator winding of the motor withstand a high voltage rise rate, it is equivalent to applying a steep shock voltage to the motor, and makes the inter-turn insulation of the motor bear a serious test.the-internal-structure-of-rotary-vane-pump

3.Harmonic electromagnetic noise and vibration:

When the motor is powered by a inverter, the vibration and noise caused by electromagnetic, mechanical, ventilation and other factors will become more complicated. The harmonics contained in the variable frequency power supply interfere with the inherent spatial harmonics of the electromagnetic part of the motor to form various electromagnetic exciting forces, thereby increasing noise. Since the operating frequency range of the motor is wide and the range of the rotational speed is large, the frequencies of various electromagnetic force waves are difficult to avoid the natural vibration frequency of each structural member of the motor.application-of-vacuum-pump-in-refrigeration-industry