When the frequency of the motor is reduced, the impedance of the coil will decrease, in order to ensure that the motor is not current, the input voltage of the motor must be reduced, so that the power of the motor is reduced, the specific reduction is determined according to the working curve of the inverter, because the working conditions of the motor are different, the inverter can change different setting curves, when the frequency is reduced, the effective value of the current will increase. When the motor frequency is higher than the rated frequency, the motor winding impedance increases, in order to ensure the motor insulation life and safety, the voltage does not increase, maintain the rated voltage, so the motor current drops, so the power also drops, it is also determined by the decline curve, the frequency is higher than the rated frequency. The motor is also hot, and the heat at this time is mainly hysteresis loss, that is, iron loss, I hope my answer will be helpful to you.