Patent ID: 8159161
Filing Date: 2012-04-17
Classification: H02P

Abstract:
1. A motor control device for controlling a motor based on an estimated magnetic pole position, comprising: a voltage applying unit for applying a voltage for estimation having a predetermined frequency to a motor; a current detection unit for detecting a current that flows in the motor; and a magnetic pole position estimation unit for estimating a magnetic pole position in a rotor of the motor based on a current detected by the current detection unit; wherein the magnetic pole position estimation unit includes an estimation processing unit for deriving a first axis component, a second axis component, a third axis component, and a fourth axis component of a current for estimation that flows in the motor due to application of the voltage for estimation from a first axis component and a second axis component of the current detected by the current detection unit, and estimating the magnetic pole position based on the first to the fourth axis components of the current for estimation, and wherein in an electric angle expression, the first axis and the second axis are mutually orthogonal and the third axis and the fourth axis are mutually orthogonal, and each of the third axis and the fourth axis differs from the first axis.