• Title/Summary/Keyword: Slot wedge

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A Novel Skewed-Type Iron Slot Wedge for Permanent Magnet Synchronous Generators for Improving Output Power and Reducing Cogging Torque

  • Kang, Sun-Il;Moon, Jae-Won;You, Yong-Min;Lee, Jin-Hee;Kwon, Byung-Il
    • Journal of Electrical Engineering and Technology
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    • v.10 no.1
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    • pp.243-250
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    • 2015
  • This paper proposes a novel skewed-type iron slot wedge that can improve both the cogging torque and the output power of a permanent magnet synchronous generator (PMSG). Generally the open slot structure is adopted in a PMSG due to its convenient winding work, but the high cogging torque is undesired. Firstly, an iron slot wedge was utilized to reduce the cogging torque of an open slot type PMSG. However, the output power of the machine decreased rapidly with this method. Thus, a proposed skewed type iron slot wedge is presented to improve the output power as well as the cogging torque as compared to the open slot type. Shape optimization of the skewed-type iron slot wedge is performed to simultaneously maximize the output power and reduce the cogging torque. The Kriging model based on the Halton sequence method and a genetic algorithm are used to optimize the design.

Design of Slot Wedge Shape for Reducing Cogging Torque in Outer Rotor Type Permanent Magnet Synchronous Generator with Open Slot Structure (개방형 슬롯 구조를 갖는 외전형 영구자석 동기발전기의 코깅 토크 저감을 위한 슬롯 ��지 형상 설계)

  • Kim, Bong-Ju;Park, Su-Kang;Moon, Jae-Won;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.936-938
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    • 2011
  • This paper suggests the slot wedge shape for reducing the cogging torque of a gearless type direct-drive permanent magnet synchronous generator with open slot shape. To achieve this, we are designed the appropriate specifications of the permanent magnet synchronous generator by selected the appropriate material of slot wedge and various slot wedge shapes. 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.

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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.

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.

Dual Band Microstrip Antenna with Air Substrate (Air Substrate를 이용한 이중 대역 마이크로스트립 안테나)

  • Lee, Seok-Moon;Kim, Hee-Joong;Ha, Cheun-Soo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.9
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    • pp.1070-1076
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    • 2007
  • In this paper, we study the characteristics of dual band microstrip antenna with the wedge-shaped radiation patch added the slot using air substrate. Wedge-shaped patch antenna with air substrate is avoided the large probe reactance associated with a thick substrate owing to the use of short probe and good impedance matching over a wide frequency range can be obtained. Slot on the antenna radiator varies the reactance component according to the employed frequency and affect the resonance freaqency of the antenna, therefore the antenna can resonate at the dual band(cellular and PCS band). The slot length and position have an effect on the bandwidth and input impedance of the antenna are optimized by simulation. From the experiment results for the fabricated antenna, -10 dB of $S_{11}$ is content with the allocated bandwidth of Cellular and PCS system and - 15 dB of cross polarization level. From the results of this paper, it has been confirmed that the proposed antenna can be used as the base station antenna fur Cellular and PCS band.

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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    • 1994.07a
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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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A Study on Characteristics of induction Motor using the magnet wedge (자성웨지를 이용한 유도전동기의 특성에 관한 연구)

  • Hong, Sung-Il;Bae, Byeong-Chun;Yoo, Woo-Hyeon
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.607-611
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    • 1992
  • This paper presents the methods in improving the efficiency using of magnet wedge. After the energy crises of 1970's, more emphasis was placed on higher efficiencies. Efficiency of an induction motor can be improved by reducing the total losses, copper, losses, iron or core losses etc. However high efficiency designs result, in larger size and cost than standard motors. In the methods of the reducing the losses, ripple losses of slot flux can be reduced by using the magnet wedge, but the starting torque decrease by means of increasing of leakage reactance.

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Analysis of On-Line Partial Discharge in High Voltage Motor Stator Windings (고압전동기 고정자 권선의 운전중 부분방전 분석)

  • Lee, Sang-Kil;Kim, Hee-Dong;Kim, Kwang-Hun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.05c
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    • pp.152-155
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    • 2002
  • During normal operation, partial discharge(PD) tests were performed using turbine generator analyzer(TGA) in high voltage motor. Epoxy-mica couplers are installed at motor terminal and analyzed PD signal using TGA. #A motor stator insulation is good because small partial discharges are detected PD pattern show that PD occurs in insulation. PD of #B motor is larger than that of #A motor and PD pattern show that positive PD larger than negative PD. It means that PD occurs between insulation and slot. And A phase PD magnitude of #B motor is large and high compare with any other phase. Therefore wedge, core and slot of #B motor need to check and repair.

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Analysis of On-Line Partial Discharge in High Voltage Motor Stator Windings (고압전동기 고정자 권선의 운전중 부분방전 분석)

  • Lee, Sang-Kil;Kim, Hee-Dong;Kim, Kwang-Hun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.05c
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    • pp.199-202
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    • 2002
  • During normal operation, partial discharge(PD) tests were performed using turbine generator analyzer(TGA) in high voltage motor. Epoxy-mica couplers are installed at motor terminal and analyzed PD signal using TGA. #A motor stator insulation is good because small partial discharges are detected. PD pattern show that PD occurs in insulation. PD of #B motor is larger than that of #A motor and PD pattern show that positive PD larger than negative PD. It means that PD occurs between insulation and slot. And A phase PD magnitude of #B motor is large and high compare with any other phase. Therefore wedge, core and slot of #B motor need to check and repair.

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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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    • 2003.07b
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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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