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| Structure and Electromagnetic Characteristics of U-Shaped Permanent Magnet Salient Pole Linear Motor |
| Xu Xiaozhuo, Feng Haichao, Ai Liwang, Du Baoyu, Ji Shengyang |
| School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454003 China |
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Abstract In some applications requiring high thrust and long stroke, such as vertical hoist system, permanent magnet synchronous linear motor (PMSLM) is limited by layout and installation space. Therefore, improving the utilization ratio of permanent magnet and achieving higher thrust density are very important. In this paper, a U-shaped permanent magnet salient pole linear motor (US-PMSPLM) is proposed. The secondary permanent magnets (PMs) with U-shaped structure can make full use of the PMs to increase the no-load back electromotive force (EMF) and thrust force obviously. Firstly, by analyzing the structure and magnetic circuit of the motor, the equivalent magnetic circuit model (EMCM) is established to analyze the variation of air gap flux density. Secondly, the finite element method (FEM) is used to compare the non-salient permanent magnet synchronous linear motor (NS-PMSLM) with the same primary structure and secondary PMs. Finally, an experimental prototype is developed, and the no-load back EMF and static thrust are tested. The experimental results are basically consistent with the simulation results, which verifies the rationality of the designed motor.
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Received: 02 September 2020
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2021, Vol. 36 
