Temperature Field Analysis of Line-Start Asynchronous Permanent Magnet Motor Based on Fluent

doi:10.11985/2015.09.003

Abstract

Abstract:

As the wide application of line-start permanent magnet motors in oil pumping units, the motor 3D model is presented, and the simplified methods of rotor core, stator base, slot insulation, cover and shaft as well as the reasonable block split size are given. According to the mathematical model of temperature calculation, the basic assumptions and boundary conditions are specified. The equivalent thermal conductivity coefficient of air gap and heat transfer coefficient of casing surface are caculated with the semi-empirical formula method. At the same time, the influence of fit-up gap between stator and case, magnet and rotor core, rotor core and shaft, case and cover, cover and bearing, cover and shaft to the motor highest temperature is also taken into consideration. The heat value is caculated with measured loss value and distributed in proportion to the motor. Finally, the temperature caculated by finite volume method (FVM) and the temperature of experimental value is contrast to verify the feasibility of this method.

Key words: Line-start PM motor, model simplification, fit-up gap, finite volume method (FVM), temperature field

CLC Number:

TM341

Li Yan,Yan Jianing,Xia Jiakuan. Temperature Field Analysis of Line-Start Asynchronous Permanent Magnet Motor Based on Fluent[J]. Journal of Electrical Engineering, 2015, 10(9): 15-21.

Figures/Tables 14

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参数名称	数值	参数名称	数值
定子/转子槽数/极数	36/28/4	端环外径/mm	117.9
铁心长度/mm	105	端环内径/mm	105.4
定子铁心外径/mm	210	机座长/mm	230
定子铁心内径/mm	136	散热筋外半径/mm	242
转子铁心外径/mm	134.4	散热筋内半径/mm	224
转子铁心内径/mm	48	机壳厚度/mm	14
永磁体宽/mm	92	散热筋数/个	36
永磁体厚/mm	3	底脚数/个	2

参数名称	数值	参数名称	数值
定子齿/mm	1.1	机壳/mm	2.0
定子轭/mm	1.0	轴承端部空气/mm	1.0
转子铁心/mm	1.0	气隙/mm	0.4
绕组/mm	0.5	转子端部空气/mm	1.0
槽绝缘/mm	0.3	端腔内空气/mm	1.0
槽楔/mm	0.2	轴承/mm	2
定子压板/mm	1.0	端盖/mm	2
转子导条/mm	0.9	隔磁槽/mm	0.9
导条端部空气/mm	1.0	永磁体/mm	1.0
端环/mm	1.0	转轴/mm	2

间隙位置	间隙值/m	导热系数/[W/(m·K)]
机壳与定子间	0.000 011 3/（式（7））	0.024 2（低温）
转子与永磁体间	0.000 1/（工艺）	0.030 5（高温）
转子和轴间	0.000 009/（工艺）	0.030 5（高温）
端盖和轴承间	0.000 01/（工艺）	0.024 2（低温）
端盖和机座间	0.000 03/（工艺）	0.024 2（低温）
端盖和转轴	0.000 05/（工艺）	0.024 2（低温）

电流/A	铁耗/W	机械耗/W	铜耗/W	杂散耗/W
10.08	143	70	312.18	74.75
	定子齿占33.19% 定子轭占66.81%	轴承	绕组	定子齿占50% 转子占25% 永磁体占25%

	损耗值/W	生热率/[×10⁶W/(m?K)]
轴承	70	0.418 451
绕组	312.18	1.025 429
定子齿	84.875	0.176 256
定子轭	95.5	0.093 270
转子	18.69	0.020 892
永磁体	18.69	0.161 210