The fundamental difference between YZP variable frequency motor and general motor lies in the word frequency conversion, frequency conversion can be adjusted, and general motor can not be satisfied with this point.

The efficiency and temperature rise of the motor Regardless of the form of the inverter, different levels of harmonic voltage and current are generated during operation, so that the motor operates under non-sinusoidal voltage and current. According to the material introduction, taking the sine wave PWM inverter that is now widely used as an example, its low-order harmonics are basically zero, and the remaining high-order harmonic components that are about twice as large as the carrier frequency are: 2u+1 (u is the modulation ratio). Secondly, when the speed of the general asynchronous motor decreases, the cooling air volume is proportional to the cubic power of the speed, which causes the low-speed cooling condition of the motor to deteriorate, the temperature rise increases sharply, and it is difficult to achieve constant torque output. The higher harmonic will cause the increase of stator copper loss, rotor copper (aluminum) loss, iron loss and additional loss, especially rotor copper (aluminum) loss. Because the asynchronous motor rotates at the synchronous speed close to the fundamental frequency, the high harmonic voltage will produce great rotor loss after cutting the rotor bar with large slip. In addition, the additional copper loss due to skin effect should be considered. First of all, the impedance of asynchronous motor is not ideal, when the power supply frequency is lower, the loss caused by high-order harmonics in the power supply is larger. The emergence of YZP inverter motor is the progress of industry and technology, because it changes the unchanging motor form, saves time and reduces consumption, and is a great success in production.