Denso Corporation

Yosuke Matsuki

Hideji Yoshida

Yasuaki Aoki

Ryo Kano

Kohei Oba

A field-weakening controller determines a d-axis current command correction value in a field-weakening control according to a voltage of a DC power supply and a voltage amplitude of a voltage command. A d-axis current final value calculator outputs a d-axis current command final value calculated using a d-axis current command value and a d-axis current command correction value. A field-weakening controller has a voltage amplitude command limiter that limits a voltage amplitude command determined based on the power supply voltage. A voltage amplitude command limiter limits the voltage amplitude command to a voltage amplitude command limit value when the motor state quantity, which is correlated with a time rate of change when a sine wave center voltage of the voltage command crosses from negative to positive, is equal to or greater than a predetermined limit start value.

Motor control device and electric power steering device provided with same

In a current detection apparatus, an arm current detection unit detects each of at least first and second phase currents having respective amplitudes and flowing in a multiphase rotary electric machine based on a potential difference between input and output terminals of the corresponding one of first and second detection switches during the corresponding one of the first and second detection switches being on. A bus current detection unit detects each of at least bus-based first and second phase currents corresponding to the first and second phases of the multiphase rotary electric machine based on a current flowing through one of first and second buses. An amplitude correction unit corrects the first and second phase currents based on the bus-based first and second phase currents such that the amplitudes of the respective first and second phase currents match with each other.

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Kariya, Japan

Yosuke Matsuki