Oriental Motor Co., Inc.

Hikaru Umino

An AC motor control device controls an inverter that supplies an alternating current to an AC motor which is a three-phase permanent magnet synchronous motor. The AC motor control device includes: pulse width modulation signal generation means that supplies a pulse width modulation signal to the inverter so that a position detection voltage vector for detection of the position of the rotor of the AC motor is applied to the AC motor; current derivative detection means that detects a current derivative occurring due to application of the position detection voltage vector to the AC motor; rotor position computation means that computes an estimated position of the rotor of the AC motor; rotor position correction means that corrects the estimated position; and drive control means that controls the pulse width modulation signal generation means so as to drive the AC motor.

AC motor control device and drive system equipped with same

A motor control device is provided, which drives a two-phase synchronous motor. The motor control device includes: control current waveform generating means which generates a control current waveform by superposing a fundamental sinusoidal wave and a reluctance torque correction waveform that suppresses the fluctuation of the reluctance torque of the two-phase synchronous motor; and current control signal generating means which generates a current control signal for supplying a current to the windings of the two-phase synchronous motor according to the control current waveform generated by the control current waveform generating means. The reluctance torque correction waveform may have a waveform profile such that an original waveform having a frequency twice that of the fundamental sinusoidal wave and having a phase matched with that of the fundamental sinusoidal wave is full-wave-rectified to the same sign as or a different sign from that of the fundamental sinusoidal wave.

Growing community of inventors

Tsukuba, Japan

Hikaru Umino