Rotor Eddy Current Loss Calculation of a 2DoF Direct-Drive Induction Motor

Wei Wu, Jikai Si, Haichao Feng, Zhiping Cheng, Yihua Hu and Chun Gan
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Wei Wu: School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China
Jikai Si: School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China
Haichao Feng: School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China
Zhiping Cheng: College of Electric Engineering, Zheng Zhou University, Zheng Zhou 450000, China
Yihua Hu: Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3BX, UK
Chun Gan: School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430000, China

Energies, 2019, vol. 12, issue 6, 1-17

Abstract: A two-degree-of-freedom direct-drive induction motor (2DoFDDIM), whose solid rotor is coated with a copper layer, is capable of linear, rotary, and helical motions and has widespread applications. For solid-rotor motors, the calculation and analysis of rotor total eddy current loss (TECL) are crucial in studying the factors causing such a loss and possible loss reduction methods. In this study, a new nonlinear analytical method considering the saturation of the rotor core is proposed to solve the fundamental magnetic field. The new method divides the time period into segments. The magnetic field distribution at any time is obtained using Maxwell equations. The eddy current losses in the copper layer and rotor core caused by the fundamental magnetic field are calculated. The surface eddy current losses in the copper layer and rotor core caused by harmonics are calculated using a 2D analytical method. TECL is determined by the sum of eddy current and surface eddy current losses. Coefficients are utilized to consider eddy, saturation, and end-region effects when calculating the rotor core TECL. The new method is verified using 3D FEM, and the results show the proposed method has higher accuracy than the original method. The errors of the rotor core and copper layer TECLs are less than 6 % and 7.3 % , respectively.

Keywords: eddy current loss; nonlinear analysis method; solid-rotor induction motor; surface eddy current loss; two-degree-of-freedom (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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