Composite Feedforward Compensation for Force Ripple in Permanent Magnet Linear Synchronous Motors

doi:10.1007/s12204-019-2111-5

Abstract

Abstract: This paper presents a method for compensating the force ripple in permanent magnet linear synchronous motors (PMLSMs) by adopting a composite feedforward compensation scheme. Firstly, the vector control system of PMLSMs is described, and various force disturbances influencing the electromagnetic thrust are analyzed. As a result, the mathematical model of the whole system considering the force ripple is established. Then, a novel composite feedforward compensation scheme is proposed, which consists of a recursive least squares (RLS) parameter identification component and two feedforward compensation loops corresponding to the reference position trajectory and the force ripple, respectively. Finally, the effectiveness and advantages of the proposed composite feedforward compensation are demonstrated by simulation. The main incentive of this paper is the combination with the composite feedforward compensation loop corresponding to the reference position trajectory to improve the compensation effect of force ripple in PMLSMs.

Key words: permanent magnet linear synchronous motor (PMLSM)| force ripple| composite feedforward compensation| recursive least squares (RLS)

摘要： This paper presents a method for compensating the force ripple in permanent magnet linear synchronous motors (PMLSMs) by adopting a composite feedforward compensation scheme. Firstly, the vector control system of PMLSMs is described, and various force disturbances influencing the electromagnetic thrust are analyzed. As a result, the mathematical model of the whole system considering the force ripple is established. Then, a novel composite feedforward compensation scheme is proposed, which consists of a recursive least squares (RLS) parameter identification component and two feedforward compensation loops corresponding to the reference position trajectory and the force ripple, respectively. Finally, the effectiveness and advantages of the proposed composite feedforward compensation are demonstrated by simulation. The main incentive of this paper is the combination with the composite feedforward compensation loop corresponding to the reference position trajectory to improve the compensation effect of force ripple in PMLSMs.

关键词: permanent magnet linear synchronous motor (PMLSM)| force ripple| composite feedforward compensation| recursive least squares (RLS)

CLC Number:

TP 273

YANG Chunyu (杨春雨), CHE Zhiyuan (车志远), ZHOU Linna (周林娜) . Composite Feedforward Compensation for Force Ripple in Permanent Magnet Linear Synchronous Motors[J]. Journal of Shanghai Jiao Tong University (Science), 2019, 24(6): 782-788.

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[18]	TAN K K, LEE T H, DOU H, et al. Force ripple suppressionin iron-core permanent magnet linear motorsusing an adaptive dither [J]. Journal of the FranklinInstitute, 2004, 341(4): 375-390.
[19]	BARATAM A, KARLAPUDY A M, MUNAGALA S.Implementation of thrust ripple reduction for a permanentmagnet linear synchronous motor using an adaptivefeed forward controller [J]. Journal of Power Electronics,2014, 14(4): 687-694.
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[26]	CHEN P, ZHENG J. PMLSM servo system design andimplement base on DSP28335 [J]. Modular MachineTool & Automatic Manufacturing Technique, 2013(1):80-83 (in Chinese).
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