No-Load Magnetic Field Analysis of a PM Canned Motor with Different Structure Parameters of Tooth Tips

doi:10.11985/2017.01.002

Abstract

Abstract:

Finite element method has a high computation accuracy and can be used to solve the magnetic field of the electric machine with complex structure. Using a three dimensional finite element method, the no-load magnetic field parameters of a permanent magnet canned motor with/without tooth tips for radial or parallel magnetization have been obtained. In addition, the no-load magnetic field parameters with two magnetizations in terms of the structure parameters of tooth tips have also analyzed. The computation results show that the fundamental amplitude and THD of the air gap flux density, and the cogging torque of the motor with tooth tips are higher for both magnetizations, while the back electromotive force is lower.

Key words: PM canned motor, no-load magnetic field, tooth tips, three finite element method

CLC Number:

TM351

Ni Youyuan,Sun Miao. No-Load Magnetic Field Analysis of a PM Canned Motor with Different Structure Parameters of Tooth Tips[J]. Journal of Electrical Engineering, 2017, 12(1): 9-16.

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参数	数值	参数	数值
定子外径/mm	80	转子外径/mm	38.4
定子内径/mm	40	转子内径/mm	15.8
定子轴向长度/mm	25	转子轴向长度/mm	25
定子轭部宽度/mm	5	转动惯量/(kg·m²)	4.5×10^-5
定子齿宽度/mm	6	阻尼系数/N·m/(r/min)	4.86×10^-6
定子绕组匝数	1 020	定子屏蔽套厚度/mm	0.30
定子绕组线径/mm	0.21	转子屏蔽套厚度/mm	0.15

定子结构	基波幅值/T	THD(%)
有齿尖	0.117 4	67.58
无齿尖	0.098 3	51.30

齿尖平均弧长 /mm	气隙磁通密度基波幅值 /T	气隙磁通密度THD (%)
0.8	0.124 6	55.04
1.6	0.122 4	51.36
2.4	0.126 3	46.38
3.2	0.132 4	43.03
4.0	0.135 2	45.92
4.8	0.136 3	51.67
5.6	0.137 0	49.75
6.4	0.141 7	46.48
7.2	0.142 8	45.20

齿尖厚度 /mm	感应电动势 /V	齿槽转矩 /(mN·m)	气隙磁通密度基波幅值/T	气隙磁通密度 THD(%)
0.6	1.05	6.42	0.137 5	44.18
0.9	1.05	6.35	0.139 6	46.16
1.2	1.06	5.89	0.142 1	49.25
1.5	1.06	6.39	0.141 9	44.06
1.8	1.05	6.27	0.139 3	47.10
2.1	1.05	6.12	0.140 2	44.73
2.4	1.06	6.37	0.140 6	43.25
2.7	1.06	6.31	0.138 2	48.10
3.0	1.05	5.92	0.141 4	46.45

齿尖倾斜角 (arctan)	感应电动势 /V	齿槽转矩 /(mN·m)	气隙磁通密度基波幅值/T	气隙磁通密度 THD(%)
0.6	1.05	6.08	0.139 8	46.40
0.9	1.05	6.32	0.140 2	47.25
1.2	1.05	6.10	0.140 6	47.24
1.5	1.05	6.50	0.141 1	49.01
1.8	1.05	6.33	0.136 9	49.86
2.1	1.05	6.19	0.140 5	47.93
2.4	1.05	6.25	0.140 3	45.48
2.7	1.05	6.58	0.140 0	47.71
3.0	1.05	6.61	0.140 5	47.58