Feedforward suppression of force ripple based on a simplex-optimized dither signal |
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Authors: | Tan K K Chin S J Dou H F |
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Affiliation: | Department of Electrical Engineering, 4 Engineering Drive 3, National University of Singapore, Singapore 117576. |
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Abstract: | This paper presents the design and realization of a feedforward dither signal to reduce the force ripple in an iron-core permanent magnet linear motor (PMLM). A composite control structure is used, consisting of three components: a simple feedforward component, a PID feedback component, and a ripple compensator (RC). The first two components are designed based on a dominant linear model of the motor. The dither signal is generated based on a signal model which is identified using a multidimensional simplex downhill method. In this way, a simple approach is available to eliminate or suppress the inherent force ripple, thus facilitating smooth precise motion while uncompromising on the maximum force achievable. Real-time experimental results verify the effectiveness of the proposed scheme for high precision motion trajectory tracking. |
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Keywords: | Force ripple Simplex optimization Feedforward control |
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