双层气隙永磁直线发电机的温度场和推力波动分析

doi:11.11985/2016.03.003

摘要/Abstract

摘要：

双层气隙圆筒型永磁直线发电机采用双层定子结构,与传统单层结构相比,结构更加紧凑,具有更高的功率密度和空间利用率。但同时双定子结构导致其推力波动较大,内层结构的散热受限导致其内部温升过高。对此本文基于电磁温度场耦合的有限元分析方法,对内层结构和内外层电流配置比例进行了改进,并在此基础上,针对该电机的双定子结构,提出了移相式定子铁心长度改变法和内外结构错位法优化电机的推力波动。研究结果表明,新的优化结构在保持发电机功率密度的基础上,有效降低了电机的温升和推力波动。

关键词: 双层气隙圆筒型直线发电机, 电磁温度耦合场, 推力波动

Abstract:

Compared with traditional single-sided construction, a double-sided tubular permanent magnet generator (DSTPMG) has higher power density and higher space utilization. But at the same time, the double-sided construction intensifies the force ripple, and the limited cooling conditions of the inner structure causes the excessively high temperature rise. In order to overcome the problems, an improved inner construction and the best ratio of external current to internal current were proposed in this paper by using electromagnetic and temperature field coupling finite element analysis method. Based on the new structure, the phase shifting stator length change method and the offset of the inside and outside structure method were used to optimize the force ripple. The analysis results prove that the optimized construction can reduce the temperature rise and force ripple effectively in keeping the power density constant.

Key words: Double-sided tubular generator, electromagnetic-temperature coupling field, force ripple

中图分类号:

TM359.4

郭亮,郑俊娜. 双层气隙永磁直线发电机的温度场和推力波动分析[J]. 电气工程学报, 2016, 11(3): 21-27.

Guo Liang,Zheng Junna. Analysis of the Temperature Field and Force Ripple of a Double-Sided Tubular Permanent Magnet Generator[J]. Journal of Electrical Engineering, 2016, 11(3): 21-27.

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参数	数值	参数	数值
极距	60	动子轴内径	73
永磁体轴向长	48	动子轴外径	78
动子轴长	1 000	内定子槽深	27
定子轴向长	360	内定子内径	3
极数	6	外定子槽深	33.5
永磁阵列轴向长	600	外定子外径	137.8

材料	导热系数/(W/m·K)
槽内混合材料	0.0638
硅钢片	轴向3.6,径向40.3
钕铁硼	9
空气	0.026

	推力值/N	推力波动(%)	初始相位角(°)
方案1	5708	7.72	7.5
方案2	5661	8.83	19.5
方案3	5623	9.07	-10.5
方案4	5643	7.74	-21