Hitachi Astemo Ltd.

Hiroto Saotome

Masaki Hano

A controller in a motor control device includes an integral operation unitA (A) that performs an arithmetic operation for a d(q)-axis integrated value I** (I**) through integral control performed on a d(q)-axis current deviation ΔI(ΔI) and is configured to perform an arithmetic operation for a d(q)-axis voltage command value for controlling an output voltage of an inverter of a three-phase brushless motor. The controller further includes a limit value arithmetic operation unitC (C) that performs an arithmetic operation for d(q)-axis integration upper and lower limit values I(I) and I(I) on the basis of a power source voltage of the inverter and the like and an integration limiting unitD (E) that limits I** (I**) within a predetermined range defined by the d(q)-axis integration upper and lower limit values.

Motor control device and motor control method

A three-phase brushless motor control device uses one shunt resistor disposed on a bus of an inverter as a drive circuit driving a three-phase brushless motor and acquires a two-phase current of the three-phase brushless motor at a predetermined timing to vector-control the three-phase brushless motor. At this time, in accordance with a duration in which the two-phase current cannot be accurately acquired, the control device varies an acquisition timing of the two-phase current or varies a period during which the three-phase brushless motor is vector-controlled.

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Hitachinaka, Japan

Hiroto Saotome