• Title, Summary, Keyword: Slot/pole combination

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Study on Machine Characteristics in Interior Permanent Magnet Synchronous Motor According to Pole/Slot Combinations with Radial Vibration Force Consideration (극수/슬롯수 조합에 따른 Radial Vibration Force 고려한 매입자석 동기모터 특성 연구)

  • Fang, Liang;Lee, Su-Jin;Lee, Byeong-Hwa;Hong, Jung-Pyo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.5
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    • pp.949-954
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    • 2011
  • This paper presents a comparative study on motor characteristics with specific consideration of radial vibration force in interior permanent magnet synchronous motors (IPMSM) according to pole/slot combinations. Three IPMSM models, 16-pole/15-slot design, 16-pole/18-slot design and 16-pole/24-slot design are built, in which 16-pole/15-slot and 16-pole/18-slot designs provide high winding factor and 16-pole/24-slot design is known as a general pole/slot combination. By coupling finite element analysis (FEA) with equivalent circuit method, motor characteristics, back electro-motive force (Back-EMF), inductances, cogging torque, etc. as well as machine output performances are analyzed and compared. The radial vibration force (RVF) distribution in air gap causing stator vibration and noise is interested. It is expected that this study help with appropriate choice of pole/slot combination in IPMSM design.

Magnetic Excitation Force of a Surface-mounted Permanent Magnet Motor due to Pole/Slot combination (SPM 모터의 극과 슬롯수 변화에 따른 전자기 가진력 특성 연구)

  • Song, Jeongyong;Kim, Doyeon;Jang, Gunhee
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.321-326
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    • 2013
  • This paper investigates the magnetic excitation force of a surface-mounted permanent magnet (SPM) motor according to the change of pole/slot combination. The characteristics of magnetic flux and radial magnetic force (RMF) due to pole/slot combination were analyzed by using magnetic circuit analysis. Also, the RMF of motors with the variable pole/slot combination was numerically simulated by using the finite element analysis to verify the result of the magnetic circuit analysis. This research shows that RMF ripple is reduced when the number of pole is smaller than the number of slot.

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Investigation on Characteristics of Interior Permanent Magnet Synchronous Motor according to Pole-Slot Combination (매입형 영구자석 동기전동기의 극 수 슬롯 수 조합에 따른 특성에 관한 연구)

  • Bahn, Ji-Hyung;Kwon, Soon-O;Ha, Seung-Hyonng;Hong, Jung-Pyo
    • Proceedings of the KIEE Conference
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    • pp.771-772
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    • 2006
  • Recently, Interior Permanent Magnet Synchronous Motor(IPMSM) is widely used in the industry applications such as power train for hybrid vehicles and compressor motors of air-conditioner due to its high power density and wide speed range. In designing motors, pole slot combination should be chosen properly according to the use of the motor and driving method in the initial design stage, accordingly there have been many researches about pole slot combination. As a part of the studies, this paper presents a comparison of characteristics of concentrated winding IPMSM, such as back-emf, Total Harmonic Distortion(THD) and core losses for each pole slot combination. By comparing the characteristics of each model, this paper can be a guide or reference in determining pole slot combination in the initial design stage.

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Characteristic Analysis and Comparison of IPMSM for HEV According to Pole and Slot Combinations (극 수와 슬롯 수 조합에 따른 HEV용 IPMSM의 특성 비교 및 분석)

  • Jung, Jae-Woo;Kwon, Soon-O;Hong, Jung-Pyo
    • Proceedings of the KIEE Conference
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    • pp.1017-1018
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    • 2007
  • Interior permanent magnet synchronous motor (IPMSM) for traction motor in the hybrid electric vehicle (HEV) has different parameters and characteristics according to pole and slot combinations. The fitting combination of pole and slot in the IPMSM improves characteristics of traction system ultimately. This paper deals with analyzing the characteristics of IPMSM for mild type HEV according to pole and slot combinations. Based on the result of characteristics, suitable pole and slot combination is presented to maximize efficiency of traction motor in the HEV system.

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Effects of Slot Combination and Skewed Slot on the Electromagnetic Vibration of a 4-pole Capacitor Motor under Load Condition

  • Hirotsuka Isao;Tsubouchi Yutaro;Tsuboi Kazuo
    • Journal of Electrical Engineering and Technology
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    • v.1 no.1
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    • pp.85-91
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    • 2006
  • Recently, the reduction of electromagnetic vibration and noise of a capacitor motor (CRM) has become a very important subject from the standpoint of environmental improvement. Therefore, the authors have studied the characteristics of the dominant electromagnetic vibration of the CRM under load condition. In this paper, the effects of slot combination and skewed slot on the dominant electromagnetic vibration of a CRM under load condition are discussed both theoretically and experimentally. As a result, the characteristics of the dominant electromagnetic vibration for the slot combination and the reduction effect of the skewed slot on the electromagnetic vibration are clarified for a 4-pole CRM.

Design and Analysis of Surface-Mounted PM Motor of Compressor for Electric Vehicles Applications according to Slot/Pole Combinations (전기자동차 압축기용 표면부착형 영구자석 전동기의 극/슬롯수 조합에 따른 특성해석 및 설계)

  • Choi, Jang-Young;Park, Hyung-Il;Jang, Seok-Myeong;Lee, Sung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.10
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    • pp.1846-1857
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    • 2011
  • This paper deals with design and analysis of surface-mounted PM (SPM) motor for compressor of air-conditioning system for electric vehicle applications according to slot/pole combination. First, required torque-speed curve characteristics are determined from operating conditions of the compressor. Restricted conditions such as motor size limit and current density are also determined. And then, under same rated and restricted conditions, twelve models which have different slot/pole combinations each other are designed for various pole arc/pitch ratio using simple equations and 2-d finite element (FE) analyses. Designed models are analyzed and compared in terms of back-emf THD, cogging torque, torque ripple, power losses, efficiency, etc. On the basis of analysis results, it is found that the motor with a 6-pole PM rotor and a 27-slot stator has most outstanding performances in electromagnetic aspects. Finally, through the mechanical modal analysis and demagnetization analysis, it is concluded that the determined motor is most suitable for the compressor of air-conditioning system for electric vehicles.

Demagnetization Detection for IPM-type BLDCMs According to Irreversible Demagnetization Patterns and Pole-Slot Coefficients

  • Kang, Dong-Hyeok;Kim, Hyung-Kyu;Park, Jun-Kyu;Hyun, Seung-Ho;Hur, Jin
    • Journal of Power Electronics
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    • v.16 no.1
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    • pp.48-56
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    • 2016
  • This paper proposes a method for detecting irreversible demagnetization using the harmonic analysis of back electromotive force (BEMF) in interior permanent magnet-type brushless DC motors. First, demagnetization patterns, such as equality, inequality, and weighted demagnetizations, are defined and classified by considering the possibility of demagnetization resulting from motor operating characteristics. Second, an available diagnostic model for the harmonic analysis of BEMFs is defined according to pole-slot coefficients because the characteristics of BEMFs under demagnetization conditions are affected by the combination of poles and slots. Third, BEMFs and their harmonic components under normal and demagnetization conditions are analyzed through simulation and experiment to verify the proposed demagnetization detection technique.

Design Considerations and Validation of Permanent Magnet Vernier Machine with Consequent Pole Rotor for Low Speed Servo Applications

  • Chung, Shi-Uk;Chun, Yon-Do;Woo, Byung-Chul;Hong, Do-Kwan;Lee, Ji-Young
    • Journal of Electrical Engineering and Technology
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    • v.8 no.5
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    • pp.1146-1151
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    • 2013
  • This paper deals with design consideration and validation of a new pole-slot combination for permanent magnet vernier machine (PMVM) with consequent pole (CP) rotor especially for extremely low speed servo applications. A 136pole-24slot PMVM with CP rotor is introduced and analyzed by 2D and 3D finite element analysis (FEA) and discussion on experimental validation is also included.

Analytical Prediction and Experimental Verification of Electromagnetic Performance of a Surface-Mounted Permanent Magnet Motor having a Fractional Slot/Pole Number Combination

  • Hong, Sang-A;Choi, Jang-Young;Jang, Seok-Myeong
    • Journal of Magnetics
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    • v.19 no.1
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    • pp.84-89
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    • 2014
  • This paper presents an analytical prediction and experimental verification of the electromagnetic performance of a parallel magnetized surface-mounted permanent magnet (SPM) motor having a fractional number of slots per pole combination. On the basis of a two-dimensional (2-D) polar coordinate system and a magnetic vector potential, analytical solutions for flux density produced by the permanent magnets (PMs) and stator windings are derived. Then, analytical solutions for back-electromotive force (emf) and electromagnetic torque are derived from these field solutions. The analytical results are thoroughly validated with 2-D nonlinear finite element (FE) analysis results. Finally, the experimental back-emf and electromagnetic torque measurements are presented to test the validity of the analysis.