Valve timing control device

摘要

A valve timing control device is provided with an electric motor (4) generating a magnetic retaining torque (Th) and a motor torque (Tm) in a motor shaft (102) based on a power supply. A power supply control system (6) controls the motor torque (Tm) by controlling the power supply supplied to the electric motor (4). A phase control mechanism (8) transmits a cam torque (Tca) that can alternate between a positive and a negative direction in response to rotation of a cam shaft, to the motor shaft (102) and controls a relative phase between the crank shaft and the cam shaft in accordance with a torque balance in the motor shaft (102). The power supply control system (6) eliminates the motor torque (Tm) that is balanced with the magnetic retaining torque (Th) and the cam torque (Tca) after a stop of the internal combustion engine (S105).