• Title/Summary/Keyword: Salient poles

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Design and Characteristics Analysis of a Novel Single-phase Hybrid SRM for Blender Application

  • Jeong, Kwang-Il;Ahn, Jin-Woo
    • Journal of Electrical Engineering and Technology
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    • v.13 no.5
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    • pp.1996-2003
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    • 2018
  • In this paper, the design and characteristic analysis of a novel single-phase hybrid switched reluctance motor (HSRM) for the purpose of replacing the universal motor in commercial blenders are presented. The proposed motor is easy to manufacture due to its simple yet robust structure with minimized power switches and no torque dead-zone. Moreover, the proposed HSRM is able to deliver a high starting torque as a requirement for blending hard food or even ice. The stator has permanent magnets (PMs) mounted on its inner surface and the rotor has a wide pole arc and salient poles that contribute to its high starting torque profile and the elimination of the torque dead-zone. Finite element method (FEM) is used to analyze the characteristic of the proposed motor. Finally, the prototype is manufactured and its performance is verified through experiments.

Rotor Shape Design for Minimization Torque Ripple of Switched Reluctance Motor (SRM 토오크리플 저감을 위한 회전자 형상 설계)

  • Oh, Ju-Hwan;Kwon, Byoung-Il
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1291-1293
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    • 2005
  • Switched reluctance motors have the advantage a high torque/weight ratio, as the large reluctance torque is made by salient poles of both stator and rotor, and a high reliability. On the other hand, the switched reluctance motors have the disadvantage of a large ripple torque which is made by salient poles. So the application for the industrial fields have been limited to special cases. This paper describes the design of a 12/8 switched reluctance motor using a enemy layer method of the asymmetry rotor. The design is focussed to reduce the torque ripple and radial force in the demanded value. The three dimension finite element analysis method(3D-FEM) was used for decides a enemy layer angle of the asymmetry rotor. This paper presents modifications of the rotor pole shape which reduces the torque ripple.

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A Study on the Comparison of SRMs with 3 Rotor Poles (3개의 회전자 극을 갖는 SRM의 비교 연구)

  • Bae, Jun-Kyung;Oh, Seok-Gyu
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.5
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    • pp.92-97
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    • 2014
  • The SRM is a doubly salient, singly excited machine. The torque is developed by the tendency for the magnetic circuit to adopt a configuration of minimum reluctance, i.e. for the rotor to move into in line with the stator poles and to maximize the inductance of the coils excited. It is common practice to combine them into groups of poles which are excited simultaneously; for example, 8/6 SRM (8 stator poles and 6 rotor poles) for 4 phases, 6/4, 12/8 SRM for 3 phases, 4/2, 6/3 SRM for 2 phases. Small number of phases in two-phase SRMs allows more cost savings with regards to the switching devices in the converter. The stator back irons of two phase 6/3 SRM and C-core 4/3 SRM does not experience any flux reversal as the flux is in the same direction whether phase A or B is excited. In this study, the similarities, the differences, and structural characteristics between the two SRMs was studied, The magnetic analysis also has been carried out by the finite element method analysis (FEM).

Optimal Rotor Shape Design of 150kW-class IPMSM for Reduce Usage of Permanent Magnet and Satisfy Induced Voltage (150kW급 IPMSM의 영구자석 사용량 저감과 유기전압 만족를 위한 회전자 형상 최적설계)

  • Jeong, Tae-Chul;Kim, Won-Ho;Jang, Ik-Sang;Kim, Mi-Jung;Lee, Ki-Deok;Lee, Jae-June;Lee, Ju
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.991-992
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    • 2011
  • This study was designed to satisfy induced voltage limits considering drive's specifications and optimize design reducing usage of permanent magnet, by increasing salient poles ratio, when designing 150kW IPMSM. In order to achieve these objectives, design plans were determined, based on Ld and Lq parameters of a basic design model, according to changes in salient poles ratio and flux linkage using IPMSM's voltage equation and torque equation and then, required torque and induced voltage were analyzed using Sensitivity Analysis. Based on analysis data, the optimum design was performed and basic model's characteristics were compared to final model's through Gradient-Based Optimization Technique.

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Optimum Design of Pole arc shape Considering Torque Ripple of SRM (SRM의 토크리플을 고려한 극호형상의 최적설계)

  • Lee, Jin-Woo;Woo, Kyung-Il;Kim, Hong-Seok;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • 2001.04a
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    • pp.30-32
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    • 2001
  • Switched reluctance motors have the advantage a high torque/weight ratio, as the large reluctance torque is made by salient poles of both start and rotor, and a high reliability. On the other hand, the switched reluctance motors have the disadvantage of a large ripple torque which is made by salient poles. So the application for the industrial fields have been limited to special cases. Geometric significant parameters are ${\beta}_r$ and ${\beta}_s$ respectively the rotor and stator pole arc while the significant electric parameters are the angles where the drive switches are turned on and off. It can be simulated that ${\beta}_r$ and ${\beta}_s$ must be chosen in a particular region of the plane (${\beta}_r,\;{\beta}_s$) called the feasible triangle. The aim of this paper is to simulate the minimum of the torque ripple by using finite element method and to determine the best choice of the rotor and stator pole arc.

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Design Considerations of 2-pole Synchronous Superconducting Rotating Machine (2극 초전도 동기기 설계법 고찰)

  • Baik, S.K.;Sohn, M.H.;Lee, E.Y.;Kwon, Y.K.;Ryu, K.S.;Jo, Y.S.
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.865-867
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    • 2001
  • Generally large synchronous rotating machines with 2 poles have more merits than the others with more than 2 poles Superconducting synchronous rotating machines also have the same tendency, but they have different structure from conventional ones because of no magnetic core inside of the rotor. As the result, design approaches of the superconducting field coils are also different, which would be classified into 2 types according to their coil shapes. The first one is race-track type and the other is saddle type Race-track type machines have almost the same structure with conventional salient pole generators which are being used as largely small scale machines with more than 2 poles. On the other hand saddle type machines correspond to conventional cylindrical generators with 2 poles used for large turbine system in power plants. In this paper several types of superconducting field coils are introduced for 2 pole superconducting machine design and then the feasibility of each type is considered. Moreover, based on the consideration. 1MVA superconducting generator(S.G.) with saddle type field coil is designed electromagnetically.

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1MVA Superconducting Generator Design (1MVA 급 초전도발전기 설계)

  • 백승규;손명환;권영길;류강식;조영식
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2000.02a
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    • pp.158-161
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    • 2000
  • Generally superconducting generators(S. G.'s) will be classified into 2 types according to their field coil shape. The first one is race-trace type and the other is saddle type. Race-track type S.G.'s have almost the same structure with conventional salient pole generators which are being used as largely small scale machines with more than 4 poles. On the other hand saddle type S.G.'s correspond to conventional cylindrical generators with 2 poles used for large turbines in power plants. In this paper 1MVA S.G. with saddle type field coil is electromagnetically designed and based on the research results from development of 30kVA S.G. with race-track type field oils in our group. other parts such as cooling systems and power leads are presented.

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Transverse Flux Linear Induction Motor for New Type Urban MAGLEV (New Type 도시형 자기부상열차용 횡방향 자속 선형유도전동기)

  • Cho, Yun-Hyun;Lee, Jae-Bong
    • Proceedings of the KIEE Conference
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    • 1993.07b
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    • pp.997-1000
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    • 1993
  • This paper proposes the linear induction motor with salient poles, transverse flux and the secondary aluminum conductor for a new type urban MAGLEV. Compared with the more usual kind of linear induction motor with longitudinal flux, TFLIM have flux paths tying transversely to the direction of motion. This shortens the magnetic circuit and produces the thrust, the attraction force and the lateral stabilization force simultaneously. Owing to these electrodynamic force, TFLIM will be usable to a new type urban MGLEV.

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A Design and Driving Characteristics of Novel Hybrid Pole Bearingless SRM (새로운 하이브리드 극 구조의 베어링리스 SRM 설계 및 운전특성)

  • Lee, Dong-Hee;Wang, Hui-Jun;An, Young-Joo;Ahn, Jin-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.12
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    • pp.2202-2207
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    • 2008
  • Bearingless SRM(Switched Reluctance Motor) is researched for high speed or special applications which can not use mechanical bearing such as bio pump. In this paper, a novel hybrid pole bearingless SRM is presented. The proposed hybrid pole bearingless SRM has salient poles for torque and suspending force production. Motor torque is controlled by the phase currents in torque pole windings, and the suspending force is controlled by suspending currents in four suspending windings for radial direction suspension. Because the proposed bearingless SRM has divided pole structure, mutual effects between torque current and suspending current are very lower than the conventional one's. From this structure, the number of power devices for power converter can be reduced for bearingless SRM driving. The proposed hybrid pole bearing less SRM is verified by the FEM analysis and experimental results.

A Study of Permanent Magnet Assisted Reluctance Synchronous Motor Design using FEM (FEM을 이용한 영구자석형 리럭턴스 동기 전동기의 설계에 대한 연구)

  • Kim, Nam-Hun;Kim, Min-Huei;Baik, Won-Sik;Kim, Dong-Hee
    • Proceedings of the KIPE Conference
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    • 2007.07a
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    • pp.467-469
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    • 2007
  • In this paper, design of PMA-RSM(permanent magnet assisted reluctance synchronous motor) for washing machine using FEM(finite element method) is presented and algorithms to maximize electromagnetic torque is introduced. FEM has been approached to show the effects of motor parameters on the developed average torque and maximum torque. The designed motor is a combination of salient poles, which is making reluctance torque, and permanent magnet which are located on the air-gap of rotor to get a enough torque during low speed resign. And to verify availability of the proposed PMA-RSM, various simulation are done as compared with bldc motor which is used for washing machine.

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