Rotor Eddy Current Loss Calculation of a 2DoF DirectDrive Induction Motor
A twodegreeoffreedom directdrive 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 solidrotor motors, the calculation and analysis of rotor total eddy current loss (TECL) are crucia...
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20190301

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Online Access:  https://www.mdpi.com/19961073/12/6/1134 
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doaj9652f8406e1349acb1cec9dfe89c79a720201125T01:56:26ZengMDPI AGEnergies1996107320190301126113410.3390/en12061134en12061134Rotor Eddy Current Loss Calculation of a 2DoF DirectDrive Induction MotorWei Wu0Jikai Si1Haichao Feng2Zhiping Cheng3Yihua Hu4Chun Gan5School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, ChinaSchool of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, ChinaSchool of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, ChinaCollege of Electric Engineering, Zheng Zhou University, Zheng Zhou 450000, ChinaDepartment of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3BX, UKSchool of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430000, ChinaA twodegreeoffreedom directdrive 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 solidrotor 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 endregion 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 <inlineformula> <math display="inline"> <semantics> <mrow> <mrow> <mn>6</mn> <mo>%</mo> </mrow> </mrow> </semantics> </math> </inlineformula> and <inlineformula> <math display="inline"> <semantics> <mrow> <mn>7.3</mn> <mo>%</mo> </mrow> </semantics> </math> </inlineformula>, respectively.https://www.mdpi.com/19961073/12/6/1134eddy current lossnonlinear analysis methodsolidrotor induction motorsurface eddy current losstwodegreeoffreedom 
collection 
DOAJ 
language 
English 
format 
Article 
sources 
DOAJ 
author 
Wei Wu Jikai Si Haichao Feng Zhiping Cheng Yihua Hu Chun Gan 
spellingShingle 
Wei Wu Jikai Si Haichao Feng Zhiping Cheng Yihua Hu Chun Gan Rotor Eddy Current Loss Calculation of a 2DoF DirectDrive Induction Motor Energies eddy current loss nonlinear analysis method solidrotor induction motor surface eddy current loss twodegreeoffreedom 
author_facet 
Wei Wu Jikai Si Haichao Feng Zhiping Cheng Yihua Hu Chun Gan 
author_sort 
Wei Wu 
title 
Rotor Eddy Current Loss Calculation of a 2DoF DirectDrive Induction Motor 
title_short 
Rotor Eddy Current Loss Calculation of a 2DoF DirectDrive Induction Motor 
title_full 
Rotor Eddy Current Loss Calculation of a 2DoF DirectDrive Induction Motor 
title_fullStr 
Rotor Eddy Current Loss Calculation of a 2DoF DirectDrive Induction Motor 
title_full_unstemmed 
Rotor Eddy Current Loss Calculation of a 2DoF DirectDrive Induction Motor 
title_sort 
rotor eddy current loss calculation of a 2dof directdrive induction motor 
publisher 
MDPI AG 
series 
Energies 
issn 
19961073 
publishDate 
20190301 
description 
A twodegreeoffreedom directdrive 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 solidrotor 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 endregion 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 <inlineformula> <math display="inline"> <semantics> <mrow> <mrow> <mn>6</mn> <mo>%</mo> </mrow> </mrow> </semantics> </math> </inlineformula> and <inlineformula> <math display="inline"> <semantics> <mrow> <mn>7.3</mn> <mo>%</mo> </mrow> </semantics> </math> </inlineformula>, respectively. 
topic 
eddy current loss nonlinear analysis method solidrotor induction motor surface eddy current loss twodegreeoffreedom 
url 
https://www.mdpi.com/19961073/12/6/1134 
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