• Title, Summary, Keyword: Magnetic slot wedge

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Comparative Analysis of Magnetic Slot Wedges Design for Increasing Performance of Railway Traction Motor

  • Liu, Huai-Cong;Cho, Sooyoung;Hong, Hyun-Seok;Joo, Kyoung-Jin;Ham, Sang-Hwan;Lee, Ju
    • Journal of Electrical Engineering and Technology
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    • v.12 no.6
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    • pp.2411-2418
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    • 2017
  • This study focuses on the effects of using open stator slots in an interior permanent magnet traction motor with a magnetic slot wedge design in order to increase the power density at its base speed. In addition, such a configuration reduces the torque ripple under field-weakening conditions. Five different wedge models were selected, each of which was evaluated using a finite element analysis (FEA). Based on the initial model, we designed magnetic slot wedges for maximum back-EMF and minimum cogging torque. In addition, the d-q axis inductance was slightly altered due to the magnetic slot wedges. Finally, we analyzed the performance of a traction machine under field weakening control. Moreover, we have outlined the requirements for an ideal magnetic slot wedge design.

Design of Magnetic Slot Wedge Shape for Reducing Cogging Torque in Permanent Magnet Synchronous Generator of Direct Drive Type (직구동 방식 영구자석 동기 발전기의 코깅 토크 저감을 위한 자성체 슬롯 ��지 형상 설계)

  • Moon, Jae-Won;Kim, Seung-Joo;Choi, Han-Suk;Park, Su-Kang;Kim, Bong-Ju;Kwon, Byung-Il
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.3
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    • pp.80-87
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    • 2012
  • This paper suggests the slot wedge shape for reducing the cogging torque of a direct-drive permanent magnet synchronous generator for a bike. To consider easy coil winding, we applied a structure of open slot for the permanent magnet synchronous generator (PMSG). Because the cogging torque of PWSG with the open slot is very large, we are designed the appropriate specifications of the PMSG by selected the appropriate material of slot wedge and various slot wedge shapes. The prototype model is selected by design theory for reducing cogging torque and maximizing efficiency of PMSG. And the detailed structure design of the model was designed by the loading distribution method. The PMSG models were analyzed by finite element method. Finally, we have suggested appropriate material of slot wedges and its shape which has benefit to further reducing cogging torque and preventing decreasing of the generating power.

Characteristic Analysis on the Induction Motor using Magnetic Wedge (자성웨지를 사용한 유도전동기의 특성해석)

  • Im, Dal-Ho;Hong, Jung-Pyo;Im, Young-Hun;Shin, Heung-Gyo;Choi, Jong-Gu
    • Proceedings of the KIEE Conference
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    • pp.171-173
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    • 1994
  • Magnetic wedge is proposed for improving the motor performance and to reduce the ripple of air gap flux. Carter's coefficient plays very important role when the ampere turns or exciting current is calculated. In this paper, we calculate the Carter's coe. by FEM taking into account the magnetic anisotropy of magnetic wedge in simple manner and analyze the effect of the wedge. And we analyze the slot leakage flux according to the wedge property.

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Analysis and Design of High Efficiency Single-Phase Induction Motor using Magnetic Wedge (자성웨지를 이용한 고효율 단상유도모터의 해석 및 설계)

  • Shim, Ho-Kyoung;Kang, Je-Nam;Wang, Se-Myung;Kim, Jong-Bong;Jung, Tae-Uk
    • Proceedings of the KIEE Conference
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    • pp.837-839
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    • 2003
  • A lot of slot openings which are the rest of winding in stator slot can be applied by wedges made of magnetically anisotropic material in order to lead magnetic flux into rotor in rotating machines. In this paper, high efficiency single-phase induction motor was analyzed with a 2-dimensional finite element method by using magnetic wedges for improvement of efficiency.

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Characteristics Analysis of the Thrust Force in LPM as Magnetic Circuit Using the FEM (유한요소법을 이용한 LPM의 자기회로 구성별 추력특성해석)

  • Cho, Hyun-Gil;Kim, Il-Jung;Lee, Eun-Woong
    • Proceedings of the KIEE Conference
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    • pp.30-32
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    • 1994
  • In this paper, in order to design Linear Pulse Motor(LPM) effectively, the flux density and the thrust force of LPM have been calculated in the air gap by using Finite Element Method(FEM). The kinds of magnetic circuit arc the variable reluctance(VR), hybrid(HB), and permanent magnet(PM) type. Tooth and slot shape arc rectangular, wedge head(tapcr; 10, 20 degree), and semi-circle type.

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The Effect of Wedges and the Electrical Characteristics of the Turbo-Generator Rotor of SSR Phenomena (자동기 공진 현상에서 터어보발전기 회전자의 전기적 특성과 Wedge의 영향)

  • 이은웅;이민명;김일중
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.40 no.4
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    • pp.407-416
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    • 1991
  • A turbogenertor without damper cage is divided into five regions according to compoding materials in the radial direcrion. And the electric and magnetic field of each region in the subsynchronous resonance (SSR) phenomena is analyzed in this paper. The analytical method is based on solving a boundary value problem involving a three-dimensional magnetic diffrsion equation and the basic function consists of the double Fourier series. And the electrical characteristics of the material and kthickness of the wedges inserted in slot of the region III, which is dependent on frequency, is to be investigated.

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