• Title/Summary/Keyword: Rotor Segments

Search Result 15, Processing Time 0.026 seconds

A Study on the Skewed Stator Slots and Skewed Rotor Magnet Segments of BLDCM (BLDCM에서의 스쿠슬롯과 스큐자극에 대한 고찰)

  • 김광헌;심동준;원종수
    • The Transactions of the Korean Institute of Electrical Engineers
    • /
    • v.40 no.7
    • /
    • pp.643-655
    • /
    • 1991
  • The analysis method on air gap permeance distribution, air gap MMF distribution, air gap flux density distribution, cogging torque and BEMF about the skewed stator slots or the skewed rotor magnet segments for BLDCM, respectively, is studied as a function of the skew ratio. The proposed method describes the differences between the skewed stator slots and teh skewed rotor magnet segments for the air gap permeance distribution, air gap MMF distribution and air gap flux density distribution. The reliability of the method is also confirmed by the waveform of the cogging torque and BEMF through experiments. And the result shows that the effects on the cogging torque and BEMF due to the skewed stator slots or the skewed rotor magnet segments are the same. In case of the skewed stator slots, the effects of the variations of the winding resistance and inductance are also studied.

Analysis on Noise of Automotive Alternator Considering the Number of Stator Slots (승용차용 교류발전기의 고정자 슬롯 수가 소음에 미치는 영향 분석)

  • Song, Jin-Seo;Kim, Gwang-Jun
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.24 no.1 s.173
    • /
    • pp.126-133
    • /
    • 2000
  • Noise of automotive alternators can be classified into mechanical noise, aerodynamic noise and electro-magnetic noise. which is the same as for electric motors. Previous studies show that the elect ro-magnetic noise takes a maw peak at the rotating frequency multiplied by the number of stator slots. It has not been proved clearly so far, however, that the major peak is wholely due to the stator slots. On the contrary it is well known that noise of motors. which has a mechanism similar to the alternator except that the number of stator slots in automotive alternators is in gene\integer multiple of that of rotor segments, is closely related to the number of rotor slots. Therefore, the statement that only the stator slots is the source of the major peak in the noise spectrum of alternators is suspicious although not easy, to show theoretically, that the statement is incorrect. In this paper. effects of the stator slots on the noise in an automotive alternator are experimentally investigated by intentionally modifying the number of stator slots in such a way that the number of the states is not an integer multiples of the rotor slots. It is shown that both the stator slots are not so much influential as the rotor slots and claimed that the major peak in the noise spectrum of conventional alternators is due to superposition of a component caused by the stator and a higher harmonic component caused by the rotor

Characteristics Analysis of Segmental Rotor Type 3-Phase SRMs (분절회전자형 3상 SRM의 특성해석)

  • Xu, Zhenyao;Lee, Dong-Hee;Ahn, Jin-Woo
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.21 no.1
    • /
    • pp.1-9
    • /
    • 2016
  • In this study, two types of switched reluctance motors (SRMs) with segmental rotors are presented in detail. The first is a 6/5 segmental rotor type, whereas the second is a 12/8 segmental rotor type. Both motor types have the same stator, rotor, and winding configurations. The stator is constructed with special stator poles, namely, exclusively designed exciting and auxiliary poles. The rotor is constructed from a series of discrete segments, each of which is embedded into the nonmagnetic isolator. The windings are only wound on the exciting poles, and no winding is wound on the auxiliary poles. Given these configurations, short flux paths and high flux-linkage utilization rate are achieved in the proposed motors, which may reduce the magnetomotive force requirement and increase the electrical utilization of a machine. To verify the effectiveness of the proposed motors, their characteristics, such as magnetic flux distribution, flux-linkage, torque, radial force, and efficiency, are analyzed and compared with those of a conventional 12/8 SRM. Meanwhile, two prototypes, one for each proposed segmental rotor type, are also designed and manufactured. Finally, the validity of the proposed motors is further verified by test results.

Design and Analysis of a Novel 16/10 Segmented Rotor SRM for 60V Belt-Driven Starter Generator

  • Sun, Xiaodong;Xue, Zhengwang;Han, Shouyi;Xu, Xing;Yang, Zebin;Chen, Long
    • Journal of Magnetics
    • /
    • v.21 no.3
    • /
    • pp.393-398
    • /
    • 2016
  • This paper proposes a novel 16/10 segmented rotor switched reluctance motor (SSRM) for belt-driven starter generators (BSGs). Different from conventional SRMs, the stator of the proposed SSRM consists of two types of stator poles, i.e., exciting and auxiliary poles, and the rotor is constructed from a series of discrete segments. The topology and operation principle of this proposed SSRM are illustrated firstly, and then the design rules are listed. In addition, the finite element method (FEM) is employed to get the static and dynamic characteristics of the proposed SSRM. Finally, the simulation results are presented to show the validity of the proposed SSRM for BSGs.

Design and Characteristics Analysis of Segmental Rotor Type 12/8 poles SRM with single teeth windings (단일치 권선을 가지는 분절회전자형 12/8SRM의 설계 및 특성해석)

  • Jeong, Guang-Il;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the KIPE Conference
    • /
    • 2014.11a
    • /
    • pp.39-40
    • /
    • 2014
  • In this paper, a novel 12/8 segmental rotor type switched reluctance motor (SRM) is proposed. Different from conventional structures, the proposed rotor consists of a series of discrete segments, and the stator is constructed from two types of stator poles: exciting and auxiliary poles. Moreover, in this structure short flux paths are taken and no flux reverse exists in the stator. While the auxiliary poles are not wound by the windings, which only provide the flux return path. Compared with conventional 12/8 SRM, the proposed structure increases the electrical utilization of the machine and decreases the core losses, which may lead to high efficiency. To verify the proposed structure, finite element method (FEM) is employed to get static and dynamic characteristics. Finally, a prototype of the proposed motor is tested for characteristics comparisons.

  • PDF

Comparative Analysis of SRM with Segmental Rotors for Vehicle Cooling Fan (자동차 쿨링팬용 분절회전자를 가지는 SRM의 특성해석 비교)

  • Xu, Zhenyao;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the KIPE Conference
    • /
    • 2015.07a
    • /
    • pp.505-506
    • /
    • 2015
  • In this paper, two types of switched reluctance motors (SRMs) with segmental rotors are presented in detail. One is 6/5 segmental rotor type; the other is 12/8 segmental rotor type. Both motors have the same stator, rotor and winding configurations. The stator is constructed with special stator poles in which the exciting and auxiliary poles are designed exclusively. The rotor is constructed from a series of discrete segments, each of which is embedded in the magnetic isolator. The windings are only wound on the exciting poles, and no windings are wound on the auxiliary poles. These structures result in short flux path and high flux-linkage utilization in the proposed motors, which may reduce the magneto motive force (MMF) requirement and increase the electrical utilization of the machine. To verify the proposed two structures, the characteristics of the proposed two types are analyzed and compared with that of conventional 12/8 SRM.

  • PDF

A Study on the Comparison of Synchronous Reluctance Motor and Induction Motor (단편형(斷片形) 회전자 구조 동기형 릴럭턴스 모터와 유도전동기의 비교에 관한 연구)

  • Son, Yeon-Ho;Lee, Jung-Ho;Kim, Jung-Chul;Lee, Dong-Myung;Yoon, Sang-Baeck;Hyun, Dong-Seok
    • Proceedings of the KIEE Conference
    • /
    • 1997.07a
    • /
    • pp.162-164
    • /
    • 1997
  • This paper represents comparisons between induction motor and synchronous reluctance motor(SynRM), on the basis of the obtainable torque-per-volume. The Synchronous Reluctance candidate has been individuated in a motor with segmented rotor; the rotor segments have been properly designed, to avoid rotor iron losses.

  • PDF

Characteristics Analysis of a Novel Segmental Rotor Axial Field Switched Reluctance Motor with Single Teeth Winding

  • Wang, Bo;Lee, Dong-Hee;Lee, Chee-Woo;Ahn, Jin-Woo
    • Journal of Power Electronics
    • /
    • v.14 no.5
    • /
    • pp.852-858
    • /
    • 2014
  • A novel 12/10 axial field switched reluctance motor (AF-SRM) is proposed for cooling fan applications in this paper. Unlike from conventional structures, the proposed motor uses the axial field instead of the radio field, the rotor is constructed from a series of discrete segments, and the stator poles are constructed from two types of stator poles: exciting and auxiliary poles. This concept improves the torque capability of a previous design by reducing the copper volume, which leads to a higher efficiency. To verify the proposed structure, the finite element method (FEM) and Matlab-Simulink are employed to get characteristics of the proposed SRM. Finally, a prototype of the proposed motor was tested for characteristic comparisons.

Performance Comparison of Conventional and Segmental Rotor Type Switched Reluctance Motor

  • Jeong, Kwang-Il;Xu, Zhenyao;Lee, Dong-Hee;Ahn, Jin-Woo
    • Journal of Electrical Engineering and Technology
    • /
    • v.13 no.3
    • /
    • pp.1138-1146
    • /
    • 2018
  • Performance comparisons of switched reluctance motor for cooling fan application are dealt in this paper. Conventional and novel segmental type motors with the same dimension are compared. The conventional 12/8 type is very popular and used widely. The structure of segmental rotor type motor is constructed from a series of discrete segments, and the stator is constructed from two types of stator poles: exciting and auxiliary poles. This type of motor has short flux path and no flux reversal in the stator. The auxiliary poles are not wound by the windings and only provide the flux return path. Compared with conventional SRM, the segmental structure increases electrical utilization of the machine and decreases core losses, which leads to higher efficiency. To verify the segmental structure, finite element method (FEM) is employed to get static and dynamic characteristics of both SRMs. Finally, the prototypes of conventional and segmental SRMs are tested for characteristics comparisons.

Design and Analysis of a Segmental Rotor Type 12/8 Switched Reluctance Motor

  • Zhang, Hongtao;Lee, Dong-Hee;Lee, Chee-Woo;Ahn, Jin-Woo
    • Journal of Power Electronics
    • /
    • v.14 no.5
    • /
    • pp.866-873
    • /
    • 2014
  • In this paper, a novel 12/8 segmental rotor type switched reluctance motor (SRM) is proposed for cooling fan applications. Unlike conventional structures, the rotor of the proposed structure is constructed from a series of discrete segments, and the stator is constructed from two types of stator poles: exciting and auxiliary poles. Moreover, in this structure, short flux paths are taken and no flux reversion exists in the stator. While the auxiliary poles are not wound by the windings, which only provide the flux return path. When compared with the conventional SRM, the proposed structure increases the electrical utilization of the machine and decreases the core losses, which may lead to a higher efficiency. To verify the proposed structure, the finite element method (FEM) and Matlab-Simulink are employed to get the static and dynamic characteristics of the proposed SRM. Finally, a prototype of the proposed motor was tested for characteristic comparisons.