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| Nanometer Positioning Control of Tubular Permanent Magnet Synchronous Linear Motor Based on Eccentric Actuation Mode |
| Xu Congyu, Yu Xiaofen, Cheng Lingli |
| Hefei University of Technology Hefei 230009 China |
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Abstract This paper analyzes the reasons causing positioning fluctuations of tubular permanent magnet synchronous linear motor (TPMSLM) and puts forward the electromagnetic damping generated by eccentric installation of stator and rotor of TPMSLM combined with the damping caused by dust protected seal of guide to absorb the thrust fluctuations aroused by electromagnetic disturbances in order to achieve the accurate positioning. In this paper, the eccentric structure in motor is adopted to establish an “intermediate link” that is similar to the ball screw drive mechanism of rotating motor. The analysis shows that the eccentric displacement of stator and rotor of TPMSLM is directly proportional to the suppression of electromagnetic disturbance. When down side gap of stator and rotor is eccentrically set to less than 0.2mm, the ability of electromagnetic disturbance suppression is increased to nearly 10 times. The experiment also shows that the seal damping of guide can absorb about 50% of the amount of electromagnetic disturbances.
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Received: 27 September 2008
Published: 04 March 2014
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2010, Vol. 25 
