Patent ID: 7932692
Filing Date: 2011-04-26
Classification: H02P

Abstract:
1. A system for controlling rotation of a salient rotor of a multiphase rotary electric machine in relation to a stator thereof, an output of the multiphase rotary electric machine being controlled based on an input signal thereto, the system comprising: a superimposing unit configured to superimpose, on the input signal to the multiphase rotary electric machine, a direct-axis frequency signal directed in a direct axis of the rotor and a quadrature-axis frequency signal directed in a quadrature axis of the rotor orthogonal to the direct axis, each of the direct-axis and quadrature-axis frequency signals having a first phase and a first period, the first period being different from a period of rotation of the rotor; a tentative angle calculator configured to calculate a tentative rotation angle of the rotor based on the phase of a first frequency signal being actually propagated in the multiphase rotary electric machine due to the superimposed direct axis frequency signal; and a corrector configured to correct the tentative rotation angle calculated by the tentative angle calculator so as to eliminate a difference between an amplitude of a second frequency signal and a predetermined target amplitude thereof the second frequency signal being actually propagated in the multiphase rotary electric machine due to at least the superimposed quadrature-axis frequency signal.