Hitachi Astemo Ltd.

Hitachi Automotive Systems, Ltd.

Junki Isobe

Toshiyuki Ajima

Kohei Myoen

Midori Takaoka

Hiroshi Tamura

Yoshitaka Iwaji

Kazuaki Tobari

Akihiro Ashida

A motor control device controls a motor, which is driven by three-phase alternating currents and to which a magnetic pole position sensor measuring a magnetic pole position of a rotor is attached, using a detection value of a rotation angle of the motor based on a measurement result of the magnetic pole position by the magnetic pole position sensor, compares a peak-current-time rotation angle representing the detection value of the rotation angle at a peak of a current value of a target phase and a reference rotation angle representing the rotation angle at a peak of a predetermined current waveform of the target phase using any one phase of the three-phase alternating currents during a three-phase short circuit of the motor as the target phase, and corrects the detection value of the rotation angle based on a result of the comparison.

Motor control device and motor control method

In a motor drive device, a phase compensation amount calculation unitcalculates a phase compensation amount &#x394;&#x3b8; for compensating a voltage phase &#x3b8;v* when a control mode is switched in a control selection unit. The control selection unitoutputs the three-phase voltage command Vuvw* according to any one of the plurality of control modes based on the modulation factor Kh*, the voltage phase &#x3b8;v*, and the phase compensation amount &#x394;&#x3b8;. A PWM control unitoutputs gate signals Gun, Gup, Gvn, Gvp, Gwn, and Gwv based on the three-phase voltage command Vuvw* and a rotor position &#x3b8;d. The inverterhas a plurality of switching elements, and controls the plurality of switching elements based on gate signals Gun, Gup, Gvn, Gyp, Gwn, and Gwv to drive the AC motor

Motor drive system

An object of the present invention is to reduce output voltage errors of an inverter circuit and stably control a motor until the motor reaches high speed rotation. An inverter device includes a PWM controller that generates a PWM pulse for converting DC voltage to AC voltage in accordance with an output request of a motor, and an inverter circuit that converts the DC voltage to the AC voltage with the PWM pulse generated by the PWM controller and drives a motor. The PWM controller changes the pulse width of the PWM pulse at predetermined timing on the upper side of the trapezoidal wave when the trapezoidal wave modulation using the trapezoidal wave is performed in the overmodulation region.

Inverter device and electric vehicle

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Hitachinaka, Japan

Junki Isobe