Analytical Calculation of Rotor Bar Current Distribution in Starting Condition of Cage Solid-Rotor Machine Considering the Effect of Eddy Current in Solid-Rotor
Zheng Yinzhao, Zhou Libing, Wang Jin
State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
Abstract：The induced current of solid-rotor and rotor bar of cage solid-rotor induction machine coupled with each other. Especially during the start-up process of two-pole machine, the current density of rotor bar shows an asymmetric U-shaped distribution due to the current of solid-rotor, decreasing first and then increasing from the top to the bottom of the slot. The traditional calculation method leads to large calculation error, affecting the accuracy of machine design. In this paper, a two-dimensional multilayer electromagnetic field analysis model that considered the effects of magnetic field saturation is established to solve the magnetic field distribution under starting condition. On this basis, considering the influence of the induced current of the rotor core yoke, an analytical calculation model was established to solve the current density distribution of rotor bar during the starting operation. Finally, by comparing with the finite element simulation, the accuracy of the calculation of the current density distribution was verified when the machine was started at different voltages. The proposed analytical calculation method is applicable to cage solid-rotor induction machines with different pole-pairs and provides a reference for accurate calculation of starting parameters and performance of the machine.
郑印钊, 周理兵, 王晋. 考虑实心体涡流影响的笼型实心转子电机起动工况导条电流分布的解析计算[J]. 电工技术学报, 2021, 36(11): 2355-2364.
Zheng Yinzhao, Zhou Libing, Wang Jin. Analytical Calculation of Rotor Bar Current Distribution in Starting Condition of Cage Solid-Rotor Machine Considering the Effect of Eddy Current in Solid-Rotor. Transactions of China Electrotechnical Society, 2021, 36(11): 2355-2364.
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2021, Vol. 36 
