Analytical Prediction and Minimization of Deadtime-Related Harmonics in Permanent Magnet Synchronous Motor

The current, torque, and speed harmonics caused by deadtime effect in voltage source inverter (VSI)-fed permanent magnet synchronous motor (PMSM) usually lead to undesired torque ripple and extra electrical loss, etc. In this article, a mathematical model is proposed to predict the deadtime-related...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2021-09, Vol.68 (9), p.7736-7746
Main Authors: Wu, Zhaoqian, Ding, Kang, Yang, Zhijian, He, Guolin
Format: Article
Language:English
Subjects:
Closed-loop transfer function
current harmonic
deadtime effect
Electric potential
Harmonic analysis
Harmonics
Inverters
Loop transfer functions
Mathematical model
Optimization
Parameters
permanent magnet synchronous motor (PMSM)
Permanent magnets
Power harmonic filters
Proportional integral
Ripples
Servomotors
Synchronous motors
Torque
torque ripple
Transfer functions
Transient performance
Voltage
voltage source inverter (VSI)
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Summary:The current, torque, and speed harmonics caused by deadtime effect in voltage source inverter (VSI)-fed permanent magnet synchronous motor (PMSM) usually lead to undesired torque ripple and extra electrical loss, etc. In this article, a mathematical model is proposed to predict the deadtime-related harmonics in VSI-fed field-oriented control PMSM, and a deadtime-related harmonic minimization method is proposed based on proportional-integral (PI) controllers tuning and under the premise of keeping the same control strategy. The expressions of current, torque, and speed harmonics caused by deadtime effects are obtained based on the complex amplitude expression of the voltage error harmonic and the derivation of the closed-loop transfer function from the deadtime-related voltage error to the d-q axis current. Based on the derived expressions, optimization objective functions are built to search the optimal PI parameters for minimizing deadtime-related harmonics and reducing the torque ripple. The optimization constraint functions can be adjusted for transient performance requirements, so the transient performance can keep good even if the deadtime-related harmonics are minimized with the optimal PI parameters. Both simulation analysis and experimental data verify the correctness of the analytical prediction and the validity of the deadtime-related harmonic minimization method.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2020.3014583