• Title, Summary, Keyword: Asymmetric stator pole

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Characteristic Analysis and Design of Switched Reluctance Motor for the Improved 2-phase Snail-earn Type Fan Motor

  • Lee, Ji-Young;Lee, Geun-Ho;Hong, Jung-Pyo
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.4B no.1
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    • pp.1-5
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    • 2004
  • This paper deals with the design and analysis of a 2-phase Switched Reluctance Motor (SRM) used for the cooling fan motor of a refrigerator. To reduce the dead zone and improve the efficiency, the snail-earn type rotor pole and the asymmetric stator pole are investigated. For the optimal shape design, the performances of each model are obtained from numerical calculation results by 2D time-stepping finite element method (FEM) coupled with circuit equations. The accuracy of analysis is verified by comparing the analysis results with experimental data. According to the investigation results, improved shapes of stator and rotor poles are proposed.

Characteristic Analysis of A Novel Two-Phase Permanent Magnet Synchronous Motor with Asymmetric U-core Stator Structure (비대칭 U - 코어 고정자 구조를 가진 새로운 2상 영구자석 동기전동기의 특성해석)

  • Zhao, Fei;Lipo, Thomas Anthony;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • pp.1089-1090
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    • 2011
  • This paper presents a novel two-phase two-pole permanent magnet synchronous motor (PMSM) with asymmetric U-core stator structure. The construction and parameters of the novel two-phase U-core PMSM are compared with a conventional U-core single-phase PMSM (SPMSM). Then transient characteristics such as torque, back-emf, and power loss of the both PMSMs are analyzed by using 3-D Finite Element Method (FEM). Under the same condition of rated input current, synchronous speed, similar dimensions and volume, FE results show that the two-phase PMSM with U-core stator has significantly less torque ripple than single-phase U-core PMSM, with similar power loss and efficiency.

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A Novel Cogging Torque Reduction Method for Single-Phase Brushless DC Motor

  • Park, Young-Un;Cho, Ju-Hee;Rhyu, Se-Hyun;Kim, Dae-Kyong
    • Journal of Magnetics
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    • v.18 no.2
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    • pp.117-124
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    • 2013
  • Single-phase, brushless DC (BLDC) motors have unequal air-gaps to eliminate the dead-point where the developed torque is zero. Unfortunately, these unequal air-gaps can deteriorate the motor characteristics in the cogging torque. This paper proposes a novel design for a single-phase BLDC motor with an asymmetric notch to solve this problem. In the design method, the asymmetric notches were placed on the stator pole face, which affects the change in permanent magnet shape or the residual flux density of the permanent magnet. Parametric analysis was performed to determine the optimal size and position of the asymmetric notch to reduce the cogging torque. Finite element analysis (FEA) was used to calculate the cogging torque. A more than 28% lower cogging torque compared to the initial model with no notch was achieved.

Finite Element Analysis considering Asymmetric Bridge Converter in 6/4 Switched Reluctance Motor (비대칭 브리지 컨버터를 고려한 6/4 스위치드 릴럭턴스 전동기의 유한요소 해석)

  • Choi, Jae-Hak;Park, Jae-Bum;Lee, Seung-Jun;Ahn, Byeong-Lib;Lee, Ju;Kim, Suk-Tae
    • Proceedings of the KIEE Conference
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    • pp.720-722
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    • 2003
  • This paper Presents a design schemes to minimize torque ripple in 6/4 Switched Reluctance Motor (SRM) using transient Finite Element Analysis (FEA) in which the magnetic field is combined with a driving circuit. Pole arcs and switching angles are major design factors. If these design factors are considered independently, the enhancement of SRM Performance is restricted. Therefore, this paper proposes not only optimal combination of stator pole arc and rotor pole arc but also the turn-on and turn-off angles as a function of pole arcs. Especially, turn-on and turn-off angle are formulated from a voltage equation and feasible design ranges are suggested with variable speed.

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Analysis of Electromagnetic Vibration Sources in 100kW Interior Permanent Magnet Motor for Ship Anti-heeling Pump Considering Eccentricity (선박 자세안정성 향상을 위한 Anti-heeling Pump용 100kW급 IPM 전동기의 편심에 의한 전자기 가진력 분석)

  • Lee, Sun-Kwon;Kang, Gyu-Hong;Hur, Jin
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.12
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    • pp.2230-2235
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    • 2011
  • The purpose of this paper is to provide the unbalanced magnetic force and vibration mode comparison between two large interior permanent magnet machines(IPM) with different pole-slot combination considering stator and rotor eccentricity. Due to the punching tolerance, the mixed eccentricity of air-gap is inevitable. It will generate the asymmetric magnetic flux density in air-gap, which makes the unbalanced magnetic pull and vibration. The study is focused on the unbalanced magnetic force and their harmonic components according to eccentricity conditions such as static, dynamic and mixed. When the high vibration is produced especially resonance, the obtained results provide clues what eccentricity condition occurs in the machine.