Suppression of speed ripple for direct-drive small inertia surface permanent magnet synchronous motor
YU Zi-song
WANG Da-zhi
ZHAO Guo-xin
HAN Wei
Abstract：Nonlinear current measurement error and voltage source inverter (VSI) nonlinear distorted voltage produce the speed ripple of direct-drive small inertia surface permanent magnet synchronous motor (SPMSM). This paper presents a composite PI (CPI) speed controller to suppress the speed ripple. The proposed speed regulator consists of a conventional PI controller shunted with a deviation compensator. The deviation compensator can reject the q axis nonlinear current measurement error which acts as a nonlinear load current. Meanwhile, the turn-off time of IGBT is modeled by a piecewise linear function which is used to deduce the VSI nonlinear distorted voltage. Integral model predictive control (MPC) is introduced as current controller to suppress VSI nonlinear distorted voltage and eliminate the zero-current clamping phenomenon. At last,the simulation results verify the feasibility of the control strategy.
Keywords：direct-drivesurface permanent magnet synchronous motorcomposite PI speed controllernonlinear cur-rent measurement errorintegral model predictive controlvoltage source inverter nonlinear distorted voltage
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 832-840 )