State feedback control of the PMSM servo-drive with sinusoidal voltage source inverter

This paper describes a new linear-quadratic non-stationary position regulator (LQR) for the permanent magnet synchronous motor servo-drive with sinusoidal voltage source inverter. The LC filter is used in order to reduce an electromagnetic torque ripple and to improve the servo-drive performance. Modelling process of a motor and LC filter was discussed. An internal input model was introduced to proposed control algorithm in order to eliminate the steady state position error caused by ramp reference position as well as load torque variations. Zero direct current control strategy was used in the described algorithm. Linear-quadratic optimization method was applied to determine non-stationary controller coefficients. Properties of the proposed control system have been verified in the simulation studies.