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Title: Adaptive feedforward compensation of force ripples in linear motors
Authors: Zhao, S. 
Tan, K.K. 
Keywords: Adaptive control
Fast Fourier Transform (FFT) analysis
Force ripples
Permanent magnet linear motors (PMLMs)
Issue Date: Sep-2005
Citation: Zhao, S., Tan, K.K. (2005-09). Adaptive feedforward compensation of force ripples in linear motors. Control Engineering Practice 13 (9) : 1081-1092. ScholarBank@NUS Repository.
Abstract: In this paper, an adaptive control scheme is proposed to reduce force ripple effects impeding motion accuracy in Permanent Magnet Linear Motors (PMLMs). The displacement periodicity of the force ripple is first obtained by using a Fast Fourier Transform (FFT) analysis. The control method is based on recursive least squares (RLS) identification of a nonlinear PMLM model which includes a model of the force ripple. Based on this model, the control algorithm can be commissioned which consists of a PID feedback control component, an adaptive feedforward component for compensation of the force ripple and another adaptive feedforward component based on the inverse dominant linear model which will serve to expedite motion tracking response. Simulation and experimental results are presented to verify the effectiveness of the proposed control scheme for high precision motion tracking applications. © 2004 Elsevier Ltd. All rights reserved.
Source Title: Control Engineering Practice
ISSN: 09670661
DOI: 10.1016/j.conengprac.2004.11.004
Appears in Collections:Staff Publications

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