三相同期電動機の制御装置および制御方法、駆動装置並びに電動パワーステアリング装置

摘要

To provide an electrically-driven power steering device which improves reliability of a driving device for a three-phase synchronous motor without increasing cost of the driving device.SOLUTION: A control device for a three-phase synchronous motor comprises: a rotation position estimation part for estimating a rotor position of the three-phase synchronous motor; and a command signal calculation part for calculating a command signal of the three-phase synchronous motor based on either a rotor position detected by a rotation position detector or the rotor position estimated by the rotation position estimation part. When the rotor position detected by the rotation position detector and the rotor position estimated by the rotation position estimation part are deviated and then substantially matched, the command signal calculation part switches between the calculation of the command signal based on the rotor position detected by the rotation position detector and the calculation of the command signal based on the rotor position estimated by the rotation position estimation part.SELECTED DRAWING: Figure 4