| 摘要 |
An influence resulting from the double saliency of an electric motor, i.e., an influence of a deviation of the axis of an alternating current due to a rotor magnetic pole position ¸ on the estimation of a magnetic pole position, is eliminated, and in particular, the magnetic pole position of the double saliency electric motor can be estimated with high precision. To this end, provisions are made for an alternating voltage impression section 1 for impressing an alternating voltage to an electric motor 5, a current detection section 4 for detecting a motor current, a reference direction generation section 8 for outputting a reference direction ¸ ' in the present state from a rotor magnetic pole position ¸ of the electric motor 5, a vector conversion section 6 for separating the detected motor current into a parallel component and a quadrature component with respect to the reference direction ¸ ', and a magnetic pole position estimation section 11-15 for estimating an actual rotor magnetic pole position ¸ of the electric motor 5 based on at least one of the parallel component and the quadrature component of the motor current. |
