Patent ID: 8816616
Filing Date: 2014-08-26
Classification: H02P

Abstract:
1. A method of feedback controlling a three-phase permanent magnet synchronous motor according to a vector control technique using a feedback loop including a feedback circuit coupled to windings of the motor for generating feedback quadrature and direct current components according to Clarke and Park transforms of currents sensed through the windings of the motor, quadrature and direct current controllers respectively input with differences of the quadrature and of the direct current components with corresponding quadrature and direct current reference values, respectively, for generating respective quadrature and direct voltage signals, and a Clarke and Park anti-transform circuit block coupled to the quadrature and direct current controllers for generating control signals of a power driving stage of the motor, the method comprising: sensing the rotor position and the rotor speed; generating additional compensation signals for compensating the control signals supplied to the power driving stage to reduce motor torque ripple, the additional compensation signals being generated at a frequency corresponding to a given harmonic of the rotor speed with an amplitude and phase and based upon the quadrature and direct voltage signals to compensate an upper and lower harmonic relative to the given harmonic of a back-electromotive force induced in the windings by rotation of the rotor; adding the additional compensation signals downstream from the quadrature and direct current controllers by one of