• Title, Summary, Keyword: Double stator

Search Result 87, Processing Time 0.082 seconds

Design and Characteristic Analysis of Double Stator Axial Field 12/10 SRM (이중고정자 횡축 12/10 SRM의 설계 및 특성 해석)

  • Son, Dong-Ho;Ahn, Jin-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.67 no.6
    • /
    • pp.730-737
    • /
    • 2018
  • This paper aims to design of a double stator axial field 12/10 SRM. Conventional and single stator axial field SRMs were reviewed to apply for automotive cooling fan. The axial field SRM has the advantage of shorter flux path, higher torque per volume and lower iron loss. However, there is axial eccentricity in single stator axial field SRM due to one side excitation. Therefore, a double stator type is designed in this paper to reduce the axial eccentricity. And the trapezoidal pole shape of the stator increases the flow of magnetic flux from stator to rotor and the torque region. The torque and efficiency are compared and tested with experiments.

Design and Analysis of Double Stator Type Bearingless Switched Reluctance Motor (이중고정자구조를 가지는 베어링리스 스위치드 릴럭턴스 전동기의 설계와 해석)

  • Peng, Wei;Lee, Dong-Hee;Ahn, Jin-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.60 no.4
    • /
    • pp.746-752
    • /
    • 2011
  • In this paper, a novel bearingless switched reluctance motor (BLSRM) with double stator is proposed. This motor has two stators. Torque stator is outside, which mainly produces rotational torque. Radial force stator is inside, which mainly generates radial force to suspend the rotor. A novel structure and operating principle are presented. And characteristics of the proposed structure such as magnetic flux distribution, inductance, torque and radial force are analyzed through finite element method. From the analysis, the proposed BLSRM has linear characteristic of radial force and independence from torque current.

Optimum Rotor Shaping for Torque Improvement of Double Stator Switched Reluctance Motor

  • Tavakkoli, Mohammadali;Moallem, Mehdi
    • Journal of Electrical Engineering and Technology
    • /
    • v.9 no.4
    • /
    • pp.1315-1323
    • /
    • 2014
  • Although the power density in Double Stator Switched Reluctance Motor (DSSRM) has been improved, the torque ripple is still very high. So, it is important to reduce the torque ripple for specific applications such as Electric Vehicles (EVs). In This paper, an effective rotor shaping optimization technique for torque ripple reduction of DSSRM is presented. This method leads to the lower torque pulsation without significant reduction in the average torque. The method is based on shape optimization of the rotor using Finite Element Method and Taguchi's optimization method for rotor reshaping for redistribution of the flux so that the phase inductance profile has smoother variation as the rotor poles move into alignment with excited stator poles. To check on new design robustness, mechanical analysis was used to evaluate structural conformity against local electromagnetic forces which cause vibration and deformation. The results show that this shape optimization technique has profound effect on the torque ripple reduction.

The Influence of Stator Pole Shape and Its Arrangements on Cogging Torque for Double-sided AFPM Generator

  • Kim, Chang-Eob;Jang, Joong-Keun;Joo, Sung-Jun
    • Journal of international Conference on Electrical Machines and Systems
    • /
    • v.3 no.4
    • /
    • pp.379-382
    • /
    • 2014
  • In this paper, the cogging torques were calculated for 1kw double-sided axial flux permanent magnet (AFPM) generator with different stator core pole arrangements. The generator is composed of 18 stator pole and 24 rotating field magnets on each side. The cogging torques of the generator with three types of arrangements of stator poles were calculated using 3D finite element method and the optimum core shape was determined to minimize the cogging torque.

Stator Winding for Characteristic Analysis of Double Sided Excitation LDM (양측여자형 LDM의 특성해석을 위한 고정자 권선법)

  • Woo, Y.S.;Baek, S.H.;Maeng, I.J.;Hong, S.C.
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.132-134
    • /
    • 2001
  • In this paper, by designning the width of the stator coil, double sided excitation LDM with multi-separated winding which is possible to obtain the constant thrust force is proposed. Using Maxwell 2D, Empulse, we were proved the characteristic analysis of LDM accoding to ratio magnet width venus coil width of LDM. Though designning for double sided excitation LDM with multi-separated winding, we could be achieved the constant thrust and rapidly time responses within the operating region.

  • PDF

Study on Cogging Torque Reduction for Small Wind Turbine AFPM Generator of Double Stator Structure (이중 고정자 구조의 소형풍력터빈용 AFPM 발전기의 코깅토크 저감에 관한 연구)

  • Jung, Tae-Uk;Bae, Byung-Duk
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.26 no.2
    • /
    • pp.71-77
    • /
    • 2012
  • The cogging torque is important to the cut-in wind speed. And, it causes the acoustic noise and the vibration on the machine. This paper presents a 3D FEA(Finite Element Analysis) to evaluate the effect of magnet skew and stator displacement on cogging torque reduction, for double core AFPM(Axial Flux Permanent Magnet) generator. As a result, the magnet skew and the stator side displacement are proved excellent techniques to reduce the cogging torque.

Control of Radial Force in Double Stator Type Bearingless Switched Reluctance Motor

  • Peng, Wei;Xu, Zhenyao;Lee, Dong-Hee;Ahn, Jin-Woo
    • Journal of Electrical Engineering and Technology
    • /
    • v.8 no.4
    • /
    • pp.766-772
    • /
    • 2013
  • Modeling and control of radial force in the double stator type bearingless switched reluctance motor (BLSRM) is researched. The rotational torque is controlled independently from the radial force control. And the radial force is constant which is independent from the rotor position. In order to realize steady suspension, analytical models of torque and radial force for the proposed structure are derived. Meanwhile, in order to realize steady suspension, control scheme for proposed BLSRM is proposed. In the control method, the radial force can be controlled in arbitrary direction and magnitude by selecting some combinations of radial force windings. The validities of structure and control method are verified by the experimental results.

Calculation of Magnetic Field for Cylindrical Stator Coils in Permanent Magnet Spherical Motor

  • Li, Hongfeng;Ma, Zigang;Han, Bing;Li, Bin;Li, Guidan
    • Journal of Electrical Engineering and Technology
    • /
    • v.13 no.6
    • /
    • pp.2158-2167
    • /
    • 2018
  • This paper analyzed the magnetic field produced by the cylindrical stator coils of permanent magnet spherical motor (PMSM). The elliptic equations about the vector magnetic potential were given. Given that the eddy current effects are neglected, the magnet field of the PMSM is regarded as irrotational field, which can be calculated by scalar magnetic potential. The current density of cylindrical stator coil was proposed based on the definition of current density. The expression of current density of stator coil was obtained according to the double Fourier series decomposition and spherical harmonic functions. Then the magnetic flux density for scalar magnetic potential was derived. Further, the influence of different parameters on radial flux density was also analyzed. Finally, the results by the analytical method in this paper were validated by finite element analysis (FEA).

Comparison and Analysis on magnetic structures of Switched Reluctance Motors (Switched Reluctance Motor의 자기적 구조에 대한 비교 해석)

  • Oh, Seok-Gyu
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.20 no.1
    • /
    • pp.131-141
    • /
    • 2016
  • SRM is designed to meet operating standards such as low cost, simple magnetic structure, a desired operating speed range, high efficiency, high performance, and good matching for DC power. The magnetic flux of SRM is independent of its direction to develop a torque and it allows the flexible characteristics of the magnetic structure for SRM. In this paper, SRM can widely classify two types, Radial-Flux SRM and Axial-Flux SRM, according to the flux direction. Radial-Flux SRM includes Conventional, Segmented stator and rotor, and Double stator SRM, etc. and Axial-Flux SRM includes C-core stator and the Axial-airgap SRM. This paper is subjected the basic characteristics to select the best of the magnetic structure of SRM in the appropriate application by the classification of SRM.

Application of Fuzzy PI Control Algorithm as Stator Power Controller of a Double-Fed Induction Machine in Wind Power Generation Systems

  • Chung, Gyo-Bum;Choi, Jae-Ho
    • Journal of Power Electronics
    • /
    • v.9 no.1
    • /
    • pp.109-116
    • /
    • 2009
  • This paper addresses the output control of a utility-connected double-fed induction machine (DFIM) for wind power generation systems (WPGS). DFIM has a back-to-back converter to control outputs of DFIM driven by the wind turbine for WPGS. To supply commercially the power of WPGS to the grid without any problems related to power quality, the real and reactive powers (PQ) at the stator side of DFIM are strictly controlled at the required level, which in this paper is realized with the Fuzzy PI controller based on the field orientation control. For the Sinusoidal Pulse Width Modulation (SPWM) converter connected to the rotor side of DFIG to maintain the controllability of PQ at the state side of DFIM, the DC voltage of the DC link capacitor is also controlled at a certain level with the conventional Proportion-Integral (PI) controller of the real power. In addition, the power quality at the grid connected to the rotor side of DFIM through the back-to-back converter is maintained in a certain level with a PI controller of the reactive power. The controllers for the PQ at the stator side of DFIM, the DC link voltage of the back-to-back inverter and the reactive power at the grid connected to the rotor side of DFIM are designed and simulated in the PSIM program, of which the result verifies the performance of the proposed controllers.