Analysis of Temperature Rise and Rotor Thermal Stress of Variable Frequency Induction Motor with Double Skewed Rotor

doi:10.11985/2023.01.002

Abstract

Abstract:

In view of the deficiency of the research on the temperature rise and rotor thermal stress of the double-skewed rotor variable frequency induction motor, the distribution law of the temperature rise and rotor thermal stress of the double-skewed rotor induction motor under the power supply of the inverter are studied. The electromagnetic loss under inverter power supply mode is calculated by using the 3D finite element method combined with the improved iron loss model. Taking the 3D electromagnetic field loss density as the load and applying it to the 3D temperature field model as the heat source, the transient temperature change process of the motor under the inverter power supply mode is simulated, and the temperature rise curve of the motor shell and the temperature distribution of each part of the motor are obtained, and the accuracy of the simulation calculation results is verified by the temperature rise experiment of the prototype. Finally, the thermal stress distribution of the double-skewed rotor squirrel cage was obtained by taking the calculation result of the temperature field as the load and applying the corresponding constraints. The position where the squirrel cage of the double-skewed rotor is easy to break is pointed out, and some useful conclusions are drawn. The cause of the broken bars of the double-skewed rotor is improved and an important reference for the thermal optimization design of the double-skewed rotor is provided.

Key words: Inverter power supply, double skewed rotor, temperature rise, rotor thermal stress

CLC Number:

TM343

MING Shuai, LIU Zhiyuan, DI Chong, BAO Xiaohua. Analysis of Temperature Rise and Rotor Thermal Stress of Variable Frequency Induction Motor with Double Skewed Rotor[J]. Journal of Electrical Engineering, 2023, 18(1): 14-23.

Figures/Tables 22

References 20

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参数	数值
相数	3
极对数p	2
输入电压U/V	135
输入频率f₁/Hz	100
输出功率/kW	22.5
定子槽数Q₁	36
转子槽数Q₂	32
载波频率/Hz	5 000
电机三圆尺寸/mm	260-170-60
中间环厚度/mm	2

供电方式	定子铜耗/W	铁耗/W	转子铝耗/W
正弦供电	532	368	282
SPWM供电	540	518	376

部件	导热系数/[W/(m∙K)]
机壳	167
定子绕组	400
转子绕组	210
等效气隙	0.082
等效绝缘	0.25
槽楔	0.5
转轴	46

部件	正弦供电/℃	SPWM供电/℃
机壳	68.16	78.34
定子绕组	78.48	89.76
转子导条	70.18	81.87
定子铁心	74.34	85.59
转子铁心	69.95	81.56
转轴	61.53	71.33