• Title, Summary, Keyword: Pole arc

Search Result 87, Processing Time 0.038 seconds

Characteristic Analysis of Disk Type Single-phase Switched Reluctance Motor with Pole Shoe in Stator (회전자에 돌출구조를 가지는 디스크형 단상 스위치드 릴럭턴스 전동기의 특성 해석)

  • Lee, Min-Myung
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.51 no.11
    • /
    • pp.612-615
    • /
    • 2002
  • The main advantages of Disk type Single-Phase Switched Reluctance Motor (DSPSRM) is the simple construction, rugged structure, low manufacturing cost and simple driving circuit. It is especially possible to make the short axial length of DSPSRM. Therefore, it is suitable to setup this motor in a narrow space. This paper presents the shape design to maximize the average torque of DSPSRM that is achieved by 3D Finite Element Method (3D FEM) considering the nonlinear of magnetic material. The characteristics of two different rotor shapes are compared. The design parameters, such as the rotor and stator pole arc, are selected to the parametric study. The effect of pole arc ratios on the torque performance is investigated. From these results, the optimal pole arc to produce the maximum torque is determined.

Analytical Approach and Experimental Verification for the Cogging Torque Reduction of Permanent Magnet Machines with Multi-pole Rotor (다극 회전자를 갖는 영구자석 기기의 코깅토크 저감을 위한 해석적 접근 및 실험적 검증)

  • Jang, Seok-Myeong;Choi, Jang-Young;Ko, Kyoung-Jin
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.1031-1032
    • /
    • 2007
  • In order to reduce the cogging torque, by predicting the variation of the cogging torque according to pole arc/pitch ratio by analytical and FE methods, pole arc/pitch ratio which makes the cogging torque minimum are determined. And then, the measurements of cogging torque for permanent magnet generators with determined pole arc/pitch ratio are presented. The reasons for the error between predicted and measured value are discussed fully in terms of the shape of permanent magnet. Finally, by confirming that predicted results for cogging torque according to pole arc/pitch ratio and skew are shown in good agreement with those obtained from measured one, the validation of analysis results is confirmed.

  • PDF

A Three-Phase 618 Structure SRM (3상 6/8극 SRM)

  • Lee Ju-Hyun;Lee Dong-Hee;Chen Hao;Ahn Jin-Woo
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.254-258
    • /
    • 2004
  • A three-phase 6/8 structure SRM (switched reluctance motor), the design and analysis of the motor are described. The range of the stator pole arc factor and the rotor pole arc factor of the motor are analyzed in the linear region. The optimum range of the stator pole arc factor and the turn-off angle of the main switches in the power converter are given with the 2-D finite element electro-magnetic field calculation of the motor and the nonlinear simulation. Test results of the prototype developed are discussed.

  • PDF

Influence of Pole Arc and Salient Pole length on Torque of Salient Pole Rotor Type Single Phase SRM (회전자 돌극형 단상 SRM에서 극호와 돌극 길이가 토오크에 미치는 영향)

  • Kim, Jun-Ho;Lee, Eun-Woong;Oh, Young-Woong;Lee, Min-Myung;Yeo, Sang-Kyom
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.107-109
    • /
    • 2001
  • The salient pole rotor type single phase SRM has a salient pole in the rotor in order to use axial direction fluxes and radial direction fluxes simultaneously. A flux linkage between the rotor and the stator are increased because of the salient pole in the rotor. But, the inductance at unaligned position and aligned position is increased together. Therefore, the length of pole are and salient pole should be selected that the inductance increment at aligned position is higher than the inductance increment at unaligned position. On this paper, we will be studied the influence of the pole arc and the salient pole length on the torque of the salient pole rotor type single phase SRM.

  • PDF

Torque Characteristics Analysis of Interior Permanent Magnet Synchronous Motor According to Pole Arc Ratio (극호비 변화에 따른 영구자석 매입형 동기전동기의 토크 특성 해석)

  • LEE Kab-Jae;Kim Ki-Chan;Lee Jong-In;Kwon Joong-Lok
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.54 no.2
    • /
    • pp.81-87
    • /
    • 2005
  • The torque characteristics of permanent magnet(PM) motor is varied according to magnet width. In this paper, the design method of magnet and magnetic circuit is proposed in order to improve the torque of Interior Permanent Magnet Synchronous Motor(IPMSM). This paper presents the effects of pole arc ratio and salient pole ratio on the torque and torque ripple in the IPMSM with concentrated winding.

Reduction and Analysis for Cogging Torque of Permanent Magnet Synchronous Generators with Multi-Pole Rotor for Wind Power Application (풍력발전용 영구자석 다극 동기발전기의 코깅토크의 해석 및 저감)

  • Jang, Seok-Myeong;Lee, Sung-Ho;Choi, Jang-Young
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.57 no.3
    • /
    • pp.375-383
    • /
    • 2008
  • This paper deals with reduction and analysis of cogging torque for permanent magnet synchronous generators with multi-pole rotor for wind power applications. Open-circuit field solutions are derived using a magnetic vector potential and a two-dimensional (2-d) polar coordinate systems. On the basis of derived open-circuit field solutions and 2-d permeance functions, we also derive open-circuit field solutions considering stator slotting effects. By using open-circuit field solutions considering stator slotting effects and energy variation methods, this paper analytically predicts the cogging torque considering skew effects. All analytical results are shown in good agreement with those obtained from finite element (FE) analyses. In order to reduce the cogging torque, by predicting the variation of the cogging torque according to pole arc/pitch ratio using analytical and FE methods, pole arc/pitch ratio which makes the cogging torque minimum are determined. However, we confirm that measured value for cogging torque of the PMG with determined pole arc/pitch ratio is twice higher than predicted value. Therefore, the reason for an error between measured and predicted cogging torque is discussed in terms of a shape of PMs and is proved experimentally.

Characteristic Analysis of Single Phase SRM on Pole Ratio (극호비에 따른 단상 SRM의 토오크 특성 해석)

  • Lee, Jong-Han;Lee, Eun-Woong;Lee, Chung-Won
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.690-692
    • /
    • 2003
  • The single phase switched reluctance motor has been studied and developed actively in the various applications with several kinds and forms because of the developments of the design technique by using the computer and of the driving technique power electronic technology, which has the merits of a simple and robust structure, and first of all reducing the number of the switching devices in comparison with poly phase switched reluctance motor. And also, the studies are making progess to substitute the switched reluctance motor for single phase induction motor. In the previous studies, the single phase switched reluctance motor for the drive of blower is designed with the design theory of the conventional rotating electric machine and poly phase switched reluctance motor. In this paper, we intend to select the optimal pole arc and pole pitch ratio by the FEM analysis, because the pole arc and pole pitch are very important factor to determine the characteristics of switched reluctance motor.

  • PDF

Study on Design and Characteristic Analysiy of 6/8 SRM (6/8극 SRM의 설계 및 특성해석에 관한 연구)

  • Sohn Ick-Jin;Oh Seok-Gyu;Hao Chen;Ahn Jin-Woo
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.407-410
    • /
    • 2002
  • A three-phase 6/8 structure Switched Reluctance Motor drive, the construction of the stator and the rotor. in the motor, the scheme of the rotor position detector and the main circuit of the power converter are described. The range of the stator pole arc factor and the rotor pole arc factor of the motor are analyzed in the linear region. The optimum range of the stator pole arc factor and the optimum range of the turn-off angle of the main switches in the power converter are given with the 2-D finite element electro-magnetic field calculation of the motor and the nonlinear simulation. Test jesuits of the developed prototype are discussed.

  • PDF

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
    • /
    • /
    • pp.720-722
    • /
    • 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.

  • PDF

Design of Permanent Magnet Type Wind Power Generators for Cogging Torque Reduction with Optimum Pole Arc Pitch Ratio (코깅토크 저감을 위한 최적 극호비를 갖는 영구자석형 풍력발전기의 설계)

  • Jang, Seok-Myeong;Kim, Jin-Soon;Ko, Kyoung-Jin;Choi, Jang-Young;Yoon, Gi-Gab
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.38-40
    • /
    • 2009
  • In order to achieve a gearless construction of the wind energy conversion system(WECS), a low-speed generator should be used. Of the various candidate machine types, radial-field, multi-pole, permanent magnet, synchronous machines may be used for low-speed applications. So, this paper deals with the design of direct-coupled, multi-pole radial field machines with permanent magnet(PM) excitation for wind power applications for cogging torque reduction through the determination of optimum pole arc/pitch ratio. On the basis of an equivalent magnetic circuit method(EMCM) and a space harmonic method(SHM), an initial design is performed considering restricted conditions. And then, a detailed design is made using a non-linear finite element analyses(FEA). Finally, test results concerning generating characteristics are given to confirm the validation of the design.

  • PDF