To employ a film capacitor by reducing the capacity of a power supply capacitor connected with the power supply side.

The current controller for AC motor comprises a battery 1, an inverter 7 conducting through a gate drive circuit 13, a power supply capacitor C1 connected with the power supply side of inverter 7, an AC motor 11, a control circuit 14 including a microcomputer, an accelerator 19, a drive/reverse switch 20, motor current sensors 9, 10, and a battery current sensor 8. The current controller for AC motor is further provided with a control circuit comprises means for control current waveform where the current level is sustained at a substantially constant level for the electrical angle of basic sine wave in the range of 60-120°, and a duty factor control means for inverter where the motor current is fed back from the current sensor and equalized to the control current wave.