When selecting the inverter, the actual motor current value should be used as the basis for the inverter selection. The rated power of the motor can only be used as a reference. In addition, it should be fully considered that the output of the inverter contains higher harmonics, which will cause the power factor and efficiency of the motor to deteriorate. Therefore, compared with the power frequency grid power supply, the motor current is increased by 10% and the temperature rise is increased by about 20%. Therefore, when selecting the motor and the inverter, the situation should be taken into consideration, and a margin should be left to prevent the temperature rise from being too high and affect the service life of the motor.