The Study of Reduction of the Thrust Ripple According to Coil Arrangement in PMLSM

Abstract

Abstract:

In order to reduce thrust ripple of permanent magnet linear synchronous motor (PMLSM), an ironless PMLSM is designed in which the coil is skewing. A 3D FEM model is built based on the geometric model to simulate the transient thrust of PMLSM and analyse the higher harmonics. Different skewing length of the coil is compared and analysed according considering their THD, the result shows a minimum thrust ripple is get when the skewing length is 19mm(pole pitch). Negative effects such as weaken of the thrust, caused by the skew of the coil are considered. The method extending the length of the permanent magnet is used to compensate the negative effects. The simulation results prove the validity of this method.

Key words: PMLSM, skew of coil, thrust ripple, harmonics, 3D FEM

CLC Number:

TM359.4

Li Le,Dong Fei,Zhao Jiwen,Su Yunsheng,Pan Zhenbao. The Study of Reduction of the Thrust Ripple According to Coil Arrangement in PMLSM[J]. Journal of Electrical Engineering, 2015, 10(8): 45-49.

Figures/Tables 9

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参数	数值
次级长度/mm	605
次级宽度/mm	10
次级高度/mm	40
永磁体长度/mm	40
永磁体宽度/mm	3
永磁体高度/mm	15
极距τ/mm	19
气隙/mm	2
极数	7

序号	倾斜距离/mm	推力均值/N	推力波动（%）
1	0	30.11	9.088 9
2	4	29.68	8.937 8
3	8	28.27	8.484 5
4	12	25.85	7.801 9
5	16	22.69	6.878 5
6	19	19.37	5.786 0
7	23	15.19	5.586 3