Patent ID: 6037741
Filing Date: 2000-03-14
Classification: H02P

Abstract:
A motor controller that regulates multi-phase alternating currents made to flow through windings, thereby controlling operation of a synchronous motor, which rotates a rotor by taking advantage of a revolving magnetic field generated in said windings in the course of the flow of the multi-phase alternating currents, said motor controller comprising:a required torque setting unit that sets a required torque to be output from said motor;an electrical angle determination unit that applies a voltage for determination to said windings at a predetermined timing and determines an electrical angle of said rotor, based on a behavior of electric currents flowing through said windings in response to the applied voltage for determination;an electrical angle estimation unit that estimates an electrical angle at each timing when control of the operation of said synchronous motor is carried out, based on the electrical angle determined by said electrical angle determination unit;a torque control unit that regulates the multi-phase alternating currents made to flow through said windings, according to the required torque and the estimated electrical angle; andan adjustment unit that adjusts execution timings of said torque control unit and said electrical angle determination unit, in order to avoid an effect of the electric currents made to flow through said windings by said torque control unit on the determination of the electrical angle.