| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor controller which increases compactness, weight saving and cost reduction by using a 1-shunt type current detection circuit, and in which the Duty range allowing current detection is maximized while reducing the processing capacity of a CPU, and to provide an electric power steering device.SOLUTION: In a motor controller, an each phase Duty command value for controlling the current of a motor is calculated by control operation, a PWM signal corresponding to each phase Duty command value is formed, and the motor is driven by an inverter based on the PWM signal. A 1-shunt type current detection circuit having an A/D conversion section is connected to the power supply side or the ground side of the inverter, and has a function for fixing each phase Duty command value to a predetermined position of carrier period, and shifting each phase Duty command value in a predetermined direction. Current detection timing for detecting each phase current of the motor and performing A/D conversion is fixed while corresponding to a predetermined position. |
