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

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 crucia...

Full description

Main Authors: , , , , , Article English 2019-03-01 Energies https://www.mdpi.com/1996-1073/12/6/1134
id doaj-9652f8406e1349acb1cec9dfe89c79a7 Article doaj-9652f8406e1349acb1cec9dfe89c79a72020-11-25T01:56:26ZengMDPI AGEnergies1996-10732019-03-01126113410.3390/en12061134en12061134Rotor Eddy Current Loss Calculation of a 2DoF Direct-Drive 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 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 % [/itex] and 7.3 % [/itex] , respectively.https://www.mdpi.com/1996-1073/12/6/1134eddy current lossnonlinear analysis methodsolid-rotor induction motorsurface eddy current losstwo-degree-of-freedom DOAJ English Article DOAJ Wei Wu Jikai Si Haichao Feng Zhiping Cheng Yihua Hu Chun Gan Wei Wu Jikai Si Haichao Feng Zhiping Cheng Yihua Hu Chun Gan Rotor Eddy Current Loss Calculation of a 2DoF Direct-Drive Induction Motor Energies eddy current loss nonlinear analysis method solid-rotor induction motor surface eddy current loss two-degree-of-freedom Wei Wu Jikai Si Haichao Feng Zhiping Cheng Yihua Hu Chun Gan Wei Wu Rotor Eddy Current Loss Calculation of a 2DoF Direct-Drive Induction Motor Rotor Eddy Current Loss Calculation of a 2DoF Direct-Drive Induction Motor Rotor Eddy Current Loss Calculation of a 2DoF Direct-Drive Induction Motor Rotor Eddy Current Loss Calculation of a 2DoF Direct-Drive Induction Motor Rotor Eddy Current Loss Calculation of a 2DoF Direct-Drive Induction Motor rotor eddy current loss calculation of a 2dof direct-drive induction motor MDPI AG Energies 1996-1073 2019-03-01 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 % [/itex] and 7.3 % [/itex] , respectively. eddy current loss nonlinear analysis method solid-rotor induction motor surface eddy current loss two-degree-of-freedom https://www.mdpi.com/1996-1073/12/6/1134 AT weiwu rotoreddycurrentlosscalculationofa2dofdirectdriveinductionmotor AT jikaisi rotoreddycurrentlosscalculationofa2dofdirectdriveinductionmotor AT haichaofeng rotoreddycurrentlosscalculationofa2dofdirectdriveinductionmotor AT zhipingcheng rotoreddycurrentlosscalculationofa2dofdirectdriveinductionmotor AT yihuahu rotoreddycurrentlosscalculationofa2dofdirectdriveinductionmotor AT chungan rotoreddycurrentlosscalculationofa2dofdirectdriveinductionmotor 1724980234775691264