• Title, Summary, Keyword: SRM

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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
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    • v.20 no.1
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    • pp.131-141
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    • 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.

Case Study on Key Activities for Effective Supplier Relationship Management(SRM) (효과적인 공급자관계관리(SRM)를 위한 핵심활동 사례연구)

  • Choi, Hye Won
    • Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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    • v.9 no.4
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    • pp.813-823
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    • 2019
  • Supplier Relationship Management (SRM) is a strategic partnership activity for an enterprise and is expected to be a significant performance element in the current enterprise environment where uncertainty is growing. Despite the effective SRM allows companies to manage quality and inventory throughout their logistics procurement process with their suppliers and increase the profitability of the company, there is a scarce of theory about supplier relationship management (SRM) and many companies are not aware of the importance of SRM and depend only on simple electronic purchasing methods. Therefore, I analyze the H Company as a case company, which is a large domestic company and has reached 2,500 domestic and overseas suppliers. SRM process and its effects are evaluated as (1) Purchasing strategy division 2) Process division (3) IT infrastructure division. By analyzing SRM as one of the management strategies that bring the overall value of enterprise performance up, and by looking at how domestic large corporations manage their suppliers, I hope that manufacturers with many suppliers will recognize the importance of SRM and build an SRM tailored to their business.

Study on Comparison Between a Toroidal SRM and a Conventional SRM (Toroidal SRM과 Conventional SRM의 특성 비교에 관한 연구)

  • Kim, Jae-Hyuck;Yang, Hyong-Yeol
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.4
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    • pp.156-165
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    • 2010
  • This paper discusses comparison between a CSRM(conventional SRM) and a TSRM(toroidal SRM). Unlike the CSRM, the TSRM has its windings mounted around the stator york instead of the stator pole. Therefore, the TSRM has many different properties in terms of the structure as well as the waveform of phase currents, phase voltages, back-EMF, flux linkages, etc. This paper presents the theoretical comparison between the TSRM and the CSRM followed by simulation results.

Drive Characteristics of Single Phase SRM for Fan Application (송풍기용 단상 SRM의 구동특성)

  • 안진우;김봉철
    • The Transactions of the Korean Institute of Power Electronics
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    • v.8 no.5
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    • pp.450-454
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    • 2003
  • This paper proposes a new driving scheme for single-phase SRM. The driving scheme is very simple and inexpensive. By use of this scheme, simple power devices based on low switching losses enable to high efficiency SRM drive. Starting, One of the main problem in single-phase SRM is overcame by a new starting algorithm with one hall sensor and a parting magnet. The proposed single phase SRM has a high efficiency and robust drive characteristics compared to that of a universal motor.

Microcontroller based Single-phase SRM Drive with High Power Factor (마이크로 콘트롤러기반의 고역률형 단상 SRM 구동)

  • Ahn, Jin-Woo;Lee, Zhen-Guo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.11 no.1
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    • pp.90-96
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    • 2006
  • A novel high power factor drive of a single-phase switched reluctance motor (SRM) is researched. It achieves sinusoidal and near unity power factor input currents. The proposed SRM drive has one additional active switches. And a single-stage approach has a simple structure and low cost. A prototype to drive an SRM equipping a suitable encoder is designed to evaluate the proposed topology. The characteristics and validity of the proposed circuit is discussed with some simulations and experimental results.

The Speed Character Measurements of the Single Phase SRM by using the Unipolar driving curcuit (유니폴라 구동회로를 이용한 단상 SRM의 속도 특성 측정)

  • Kim, Yong-Heon;Lee, Eun-Woong;Lee, Jong-Han;Jo, Yeon-Chan
    • Proceedings of the KIEE Conference
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    • pp.887-888
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    • 2006
  • Switched Reluctance Motor(SRM) is rotated by reluctance force generated between rotor pole and stator pole. So SRM must be switched by exciting current according to rotor position. but SRM takes the advantages of high speed driving and very simple structure. The single phase SRM can not be start by itself and torque ripple is generated more than multi-phase SRM. But mechanical structure and driver is simpler than multi-phase SRM. The single phase SRM driver is composed with the absolute encoder and DSP to control exciting section and current, and is supplied by constant voltage. So The paper is intend to measure the speed charactrer of double silent pole type SRM by using the unipolar driving curcuit.

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Design of Variable Speed SRM Drive for Hydraulic Pump Application (유압펌프용 가변속 SRM 구동시스템 설계)

  • Lee, Dong-Hee;Kim, Bong-Chul;An, Young-Joo;Ahn, Jin-Woo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.11 no.1
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    • pp.1-6
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    • 2006
  • This paper proposes an SRM drive system to improve the drive efficiency of the hydraulic system. From the maximum hydraulic pressure and flow rate required by the hydraulic system, a proper SRM is designed and tested. The proposed SRM drive system controls oil pressure of the hydraulic system as well as motor speed. A 2.2[kW], 12/8-pole SR motor and digital controller based DSP are designed and tested for hydraulic pump system. The test results show that the system has some good features such as high efficiency and rapid response characteristics.

Degign and Drive Characteristics of High Speed SRM (고속 SRM의 설계 및 구동특성)

  • Liang, Jianing;Kim, Tae-Hyoung;Ahn, Jin-Woo;Ahn, Young-Joo
    • Proceedings of the KIEE Conference
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    • pp.1138-1140
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    • 2005
  • This paper presents dynamic characteristics of super high speed SRM and it's drive. The nonlinear model of super high speed SRM is implement by Matlab/simulink and the simulation results show that the prototypeSRM can operate up 20,000[rpm]with stable performance.

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A Study of SRM Speed Responce Characteristics Using Fuzzy PI Controller (퍼지 PI 제어기를 이용한 SRM 속도 응답 특성에 관한 연구)

  • 박희성;최재동;오인석;황영성;성세진
    • Proceedings of the KIPE Conference
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    • pp.200-203
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    • 1998
  • In this paper, it deals with Switched Reluctance Motor(SRM) which has fuzzy logic contoroller(FLC). The modeling and FLC of SRM are presented. The modeling and FLC of SRM are presented. The results of simulation show the speed responce characteristics of SRM with FLC. As a result, the SRM controller with FLC is verified by comparison between PI controller and fuzzy logic controller.

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A Switched Reluctance Motor for Single Phase Drive (단상구동 Switched Reluctance Motor의 해석)

  • Lim, Jun-Young;Kim, Hyung-Sup;Oh, Jae-Yoon
    • Proceedings of the KIEE Conference
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    • pp.1951-1953
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    • 1997
  • A switched reluctance motor (SRM) has very simple structure and robustness. Generally, for driving SRM, several (6-8) switching devices are required. This is weakpoint for reducing the cost of SRM drive. In This paper, we simulate the single phase and three phase SRM, and we compare the performance or single phase SRM with that of three phase SRM through experiment. Finally we suggest the appropriate application of single phase SRM.

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