Calculation of Fluid Field and Thermal Field for Air-Air Cooled Medium-Size Motor

Abstract

Abstract:

For a medium air-cooled asynchronous motor, the physical model of cooling air inside the motor was established to research the air flow distribution and characteristics of the internal flow of the medium motor. By the finite volume method according to the computational fluid mechanics (CFD) principle, the three-dimensional turbulent flow field in computational domain was simulated numerically using boundary conditions of the pressure inlet and outlet obtained from engineering calculations. Eventually found the cooling wind speed near the ends of the ventilation is higher than which near the middle of the ventilation, it makes the temperature rise in both ends of the stator core is lower than in the middle of the stator core; and the maximum temperature rise of the motor occurs at the end of the lower winding.

Key words: Fluid field, thermal field, finite volume method, air-air cooled

CLC Number:

TM315

Hu Tian,Tang Renyuan,Li Yan. Calculation of Fluid Field and Thermal Field for Air-Air Cooled Medium-Size Motor[J]. Journal of Electrical Engineering, 2015, 10(7): 11-17.

Figures/Tables 15

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参数	数值	参数	数值
额定功率/kW	2 500	转子内径/mm	350
额定转速/ (r/min)	1 494	气隙长度/mm	2.8
机座外径/mm	1 280	额定电压/V	6 000
定子外径/mm	1 060	额定电流/A	276
定子内径/mm	700	效率（%）	96.9

损耗名称	损耗	损耗名称	损耗
定子轭部损耗	11.11	导条损耗	10.198
定子齿部损耗	8.73	机械损耗	19.89
定子铜耗	17.675	杂散损耗	12.50

部件名称	导热系数/（W/（m·K））
部件名称	x方向	y方向	z方向（轴向）
定子铁心	39	39	4.43
空气	0.030 5	0.030 5	0.030 5
定子绕组	385	385	385
槽楔	0.2	0.2	0.2
机壳	39.2	39.2	39.2
转子轭部	45	45	45

位置	风速/（m/s）
通风道1	65.2
通风道2	18.0
通风道3	4.82
通风道4	1.33
通风道5	0.35
通风道6	0.09
通风道7	0.03
通风道8	0.04
通风道9	0.08
通风道10	0.32
通风道11	1.31
通风道12	4.8
通风道13	18.1
通风道14	65.0

区域	温升/K
最高温升	72.4
定子绕组最高温升	72.4
定子绕组平均温升	61.3
定子铁心平均温升	50.8
转子铁心平均温升	52.7