More energy efficient

All household appliances generate different levels of harmonic voltage and current during motor operation, so that the motor operates under non-sinusoidal voltage and current. Higher harmonics cause an increase in the stator copper loss, rotor copper (aluminum) consumption, iron loss and additional losses, most notably the rotor copper (aluminum) consumption. Since the conventional AC asynchronous motor rotates at a synchronous speed close to the fundamental frequency, the high-order harmonic voltage will cause a large rotor loss after cutting the rotor bar with a large slip. In addition, the additional copper consumption due to the skin effect needs to be considered. These losses will cause the motor to generate extra heat, reduce efficiency, and reduce output power. However, if a variable frequency motor is used, its energy consumption can be reduced by 20%-30%.

long lasting

When the motor is running, the carrier frequency is about several thousand to ten kilohertz, which makes the stator winding of the motor to withstand a high voltage rise rate, which is equivalent to applying a steep shock voltage to the motor to insulate the turn of the motor. Bear a more severe test. The variable frequency motor can work under the voltage of rectification and filtering, the performance can be more stable, and the life is longer.

Low noise

Ordinary asynchronous motors are more complicated in vibration and noise caused by electromagnetic, mechanical, ventilation and other factors. Each time harmonic contained in the variable frequency power supply interferes with the inherent spatial harmonics of the electromagnetic part of the motor to form various electromagnetic exciting forces. When the frequency of the electromagnetic force wave coincides with or is close to the natural vibration frequency of the motor body, a resonance phenomenon occurs, 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 component of the motor. However, variable frequency motors can effectively solve these problems.