Abstract
A method is proposed for reducing speed ripple of permanent magnet synchronous motors (PMSMs) controlled by space vector pulse width modulation (SVPWM). A flux graph and mathematics are used to analyze the speed ripple characteristics of the PMSM. Analysis indicates that the 6P (P refers to pole pairs of the PMSM) time harmonic of rotor mechanical speed is the main harmonic component in the SVPWM control PMSM system. To reduce PMSM speed ripple, harmonics are superposed on a SVPWM reference signal. A particle swarm optimization (PSO) algorithm is proposed to determine the optimal phase and multiplier coefficient of the superposed harmonics. The results of a Fourier decomposition and an optimized simulation model verified the accuracy of the analysis as well as the effectiveness of the speed ripple reduction methods, respectively.
Highlights
Permanent magnet synchronous motors (PMSMs) have been widely used in industrial automation and robotics because of their advantages of high power density and efficiency, high power factor, and maintenance-free operation [1,2]
Based on our analysis of speed ripple characteristics caused by the space vector pulse width modulation (SVPWM) control model, speed ripple was reduced by injecting a harmonic into the speed reference signal
The SVPWM control simulation model of the PMSM was established in MATLAB software (R2011a, MathWorks, Natick, MA, USA)
Summary
Permanent magnet synchronous motors (PMSMs) have been widely used in industrial automation and robotics because of their advantages of high power density and efficiency, high power factor, and maintenance-free operation [1,2]. Analyzing torque ripple characteristics of PMSM under SVPWM control and reducing torque ripple of the motor by optimizing the control method are the ways to achieve the goal of minimizing speed ripple. A rotor-shaping method with inverse cosine shape around each pole which was used to optimize the flux in the air gap can reduce the torque ripple [13] In another way, a new switching control strategy has been proposed based on a sliding mode observer, and tis strategy uses a 7-segment approach to reducing switch-state quantity changes during the voltage vector switching [14]. Based on our analysis of speed ripple characteristics caused by the SVPWM control model, speed ripple was reduced by injecting a harmonic into the speed reference signal. The conclusion verifies the correctness and accuracy of the proposed method
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