| abstract |
(57) [Summary] To output and calculate the output power of a motor or an inverter without attaching a special detector such as a DC current detector. In an inverter device in which an output current detected by CT2 is phase-converted by a three-phase to two-phase conversion circuit (23) and a torque current component corresponding to a rating is detected, a power operation circuit (3) is provided. In step 2, the motor output power is calculated from the detected torque current component, the motor rotation speed from the speed detection circuit 11, and the rated capacity, circuit constant, and excitation current of the motor prepared in the memory 31 in advance. , The motor output power is displayed on the panel 37 surface. According to this method, it is not necessary to obtain the input power of the inverter as in the case of obtaining the motor output power, so that the DC current detector CT1 and the like are unnecessary. |