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Mathematical Problems in Engineering
Volume 2015 (2015), Article ID 315898, 9 pages
Research Article

A Novel SHMPWM Technique for Sensorless Control in High-Power PMSM

School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China

Received 28 July 2014; Revised 16 January 2015; Accepted 29 January 2015

Academic Editor: Mehmet Onder Efe

Copyright © 2015 Yanjun Yu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In view of the low switching frequency restriction of high-power permanent magnet synchronous motor (PMSM) drive system and longing for sensorless control in hostile conditions, a novel PWM control scheme, born out of selective harmonic mitigation pulse width modulation (SHMPWM) technique, was proposed for sensorless control of high-power PMSM. A new enhanced constraint was placed on the traditional SHMPWM nonlinear transcendental equation to selectively generate constant amount of a certain order harmonic signals while guaranteed that the undesired harmonic signals can be suppressed. At the same time, the order harmonic signals were extracted by band-pass filter, which had the constant amplitude and phase angle difference of 120°, equivalent to inject rotating voltage vector in the natural coordinate system of motor, and the rotor position can be estimated using the order harmonic signals. The nonlinear transcendental equation of the novel modulation technique had been designed, and its numerical method had been analyzed. The rotor position observer had been designed according to the order harmonic signals. Simulation results verify that the harmonic suppression of the system was implemented, and the sensorless control was efficient by the novel SHMPWM technique.