Device for estimating pole position of synchronous motor

Details Device for estimating pole position of synchronous motor Device for estimating pole position of synchronous motor

2007-01-09

2007-01-09

Ip, Paul (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

C318S721000, C318S723000, C318S727000

Reexamination Certificate

active

10554553

ABSTRACT:
An influence resulting from 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 θ on the estimation of a magnetic pole position, is eliminated, and, in particular, the magnetic pole position of a double saliency electric motor can be estimated with high precision. To this end, an alternating voltage impression section impresses an alternating voltage on an electric motor, a current detection section detects a motor current, a reference direction generation section outputs an instantaneous reference direction θ′ from a rotor magnetic pole position θ of the electric motor, a vector conversion section separates the detected current into a parallel component and a quadrature component with respect to the reference direction θ′, and a magnetic pole position estimation section estimates actual rotor magnetic pole position θ of the electric motor based on at least one of the parallel component and the quadrature component of the current.

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