[논문]토크 리플 저감을 위한 새로운 비대칭 하프-타입 영구자석 매입형 브러시리스 직류 모터 구조

심요섭; 니구치 노보루; 히라타 카츠히로

doi:10.6113/tkpe.2016.21.2.134

토크 리플 저감을 위한 새로운 비대칭 하프-타입 영구자석 매입형 브러시리스 직류 모터 구조
A Novel Asymmetrical Half-type IPM BLDC Motor Structure for Reducing Torque Ripple 원문보기

전력전자학회 논문지 = The Transactions of the Korean Institute of Power Electronics, v.21 no.2, 2016년, pp.134 - 143

심요섭 (Dept. of Adaptive Machine Systems, Graduate School of Engineering, Osaka University) , 니구치 노보루 (Dept. of Adaptive Machine Systems, Graduate School of Engineering, Osaka University) , 히라타 카츠히로 (Dept. of Adaptive Machine Systems, Graduate School of Engineering, Osaka University)

Abstract ▼ AI-Helper

This paper proposes a novel asymmetrical interior permanent magnet (IPM) brushless DC (BLDC) motor structure, which utilizes half-type permanent magnet (PM) configuration and has asymmetrical side gaps (slot next to the PMs) for reducing torque ripples. This structure uses 24% less volume of PMs than conventional IPM BLDC motor with a full set of magnets. The characteristics of the proposed motor are compared with three other half-type IPM BLDC motors through finite elements method (FEM) analysis, and the usefulness of the proposed motor was verified through experimental evaluation on prototypes of the conventional motor and proposed motor under various torque load conditions. This research obtained a high-performance IPM BLDC motor while decreasing manufacturing cost at the same time.

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문제 정의

Also, many industries carefully have considered to apply half-type IPM BLDC motors to their actual physical actuator systems since they could not make a novel idea for reducing torque ripples of them. Because of this reason, this research focuses on torque ripple reduction of half-type IPM BLDC motors by considering side gaps under square drive signal.

제안 방법

Experimental evaluation was also carried out under various torque load conditions with prototypes of the conventional IPM BLDC motor and proposed asymmetrical half-type IPM BLDC motor to verify the FEM analysis results and usefulness of the proposed asymmetrical half-type IPM BLDC motor. Figs 15 and 16 show the rotor structures and assembled same-sized prototypes, and Fig 17 shows the experimental evaluation setup.
First, the characteristics of the asymmetrical half-type IPM BLDC motor were determined by FEM analysis. Then, a prototype was manufactured and the experimental evaluation results were compared with those of the FEM analyses.
First, to determine the torque ripple characteristics of all the half-type IPM BLDC motors, FEM analysis was carried out under various torque load conditions. In this analysis, the characteristics during steady state operation were analyzed.
First, to determine the torque ripple characteristics of all the half-type IPM BLDC motors, FEM analysis was carried out under various torque load conditions. In this analysis, the characteristics during steady state operation were analyzed. Fig 7 shows the torque ripples of each half-type IPM BLDC motor and Table II summarizes the analysis results.
Next, the conventional IPM BLDC motor and the proposed asymmetrical half-type IPM BLDC motor were compared using FEM analysis under various torque load conditions to verify the usefulness of the proposed asymmetrical half-type IPM BLDC motor. In this analysis, the various characteristics during steady state operation were analyzed.
In this research, analyses were carried out by coupling the FEM models of the 8 pole 12 slot BLDC motor with a 3 phase switching electrical circuit. The 3 phase switching electrical circuit outputs U, V, W 6 step square waveform drive signals according to the rotation angle.
In this research, both of conventional IPM BLDC motor and the proposed asymmetrical half-type IPM BLDC motor were designed according to the target motor specification. Table I shows the target motor specification.
In this research, a novel asymmetrical half-type IPM BLDC motor was proposed. Its characteristics were calculated through FEM analysis and also determined through experimental evaluation on a prototype under various torque load conditions. The PM volume usage was reduced by 24 % than that of the conventional IPM BLDC motor.
Next, the conventional IPM BLDC motor and the proposed asymmetrical half-type IPM BLDC motor were compared using FEM analysis under various torque load conditions to verify the usefulness of the proposed asymmetrical half-type IPM BLDC motor. In this analysis, the various characteristics during steady state operation were analyzed.
However, initial analyses showed that the torque ripple increased. This problem was tackled by adjusting the side gaps (slot next to the PMs) and making them asymmetrical. Although some studies such as^[7]-[9] have researched on the half-type PM motors, they did not consider how to reduce the torque ripple of them by side gaps.

성능/효과

As shown in the analysis results, a difference of the magnetic flux density in the air gap between magnet inserted side and magnetless side of the proposed asymmetrical half-type IPM BLDC motor shows a lower tendency than those of three other half-type IPM BLDC motors. Because of this reason, the magnetic flux density distribution in the air gap of magnet inserted side and magnetless side of the proposed asymmetrical half-type IPM BLDC motor became more symmetrical-shaped than those of three other half-type IPM BLDC motors, and this made a lower tendency of torque ripples.

후속연구

In conclusion, it is possible to obtain high performance by the proposed asymmetrical half-type IPM BLDC motor under the same requirements of motor characteristics without increasing motor size, and this makes us to expect the proposed asymmetrical half-type IPM BLDC motor to be implemented in many fields.

참고문헌 (10)

K. J. Kang, G. H. Jang, and S. J. Sung, "Frequency characteristics of BEMF, cogging torque and UMF in a HDD spindle motor due to unevenly magnetized PM," IEEE Trans. on Magnetics, Vol. 49, No. 6, pp. 2578-2581, Jun. 2013.

상세보기
H. S. Kim, Y. M. You, and B. I. Kwon, "Rotor shape optimization of interior permanent magnet BLDC motor according to magnetization direction," IEEE Trans. on Magnetics, Vol. 49, No. 5, pp. 2193-2196, May 2013.

상세보기
P. Upadhayay and K. R. Rajagopal, "Torque ripple reduction using magnet pole shaping in a surface mounted permanent magnet BLDC motor," in Proc. 2013 International Conference on Renewable Energy Research and Applications (ICRERA), pp. 516-521, Oct. 2013.
Z. Azar, Z. Q. Zhu, and G. Ombach, "Influence of electric loading and magnetic saturation on cogging torque, back-EMF and torque ripple of PM machines," IEEE Trans. on Magnetics, Vol. 48, No. 10, pp. 2650-2658, Oct. 2012.

상세보기
W. Q. Chu and Z. Q. Zhu, "Investigation of torque ripples in permanent magnet synchronous machines with skewing," IEEE Trans. on Magnetics, Vol. 49, No. 3, pp. 1211-1220 Mar. 2013.

상세보기
F. Zhao, T. A. Lipo, and B. I. Kwon, "A novel two-phase permanent magnet synchronous motor modeling for torque ripple minimization," IEEE Trans. on Magnetics, Vol. 49, No. 5, pp. 2355-2358, May 2013.

상세보기
J. Asama, M. Amada, M. Takemoto, A. Chiba, T. Fukao, and A. Rahman, "Voltage characteristics of a consequent-pole bearingless PM motor with concentrated windings," IEEE Trans. on Magnetics, Vol. 45, No. 6, pp. 2823-2826, Jun. 2009.

상세보기
T. Yamada, Y. Nakano, J. Asama, A. Chiba, T. Fukao, T. Hoshino, and A. Nakajima, "Outer rotor consequent-pole bearingless motor with improved start-up characteristics," IEEE Trans. on Magnetics, Vol. 44, No. 11, pp. 4273-4276, Nov. 2008.

상세보기
J. Asama, D. Kanehara, T. Oiwa, and A. Chiba, "Development of a compact centrifugal pump with a two-axis actively positioned consequent-pole bearingless motor," IEEE Trans. on Industry Applications, Vol. 50, No. 1, pp. 288-295, Jan./Feb. 2014.

상세보기
Y. S. Sim, N. Niguchi, and K. Hirata, "A novel half-type permanent magnet structure of IPM BLDC motor," in Proc. 2015 IEEE Magnetics Conference (INTERMAG), FY-05, May. 2015.

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토크 리플 저감을 위한 새로운 비대칭 하프-타입 영구자석 매입형 브러시리스 직류 모터 구조
A Novel Asymmetrical Half-type IPM BLDC Motor Structure for Reducing Torque Ripple 원문보기

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토크 리플 저감을 위한 새로운 비대칭 하프-타입 영구자석 매입형 브러시리스 직류 모터 구조 A Novel Asymmetrical Half-type IPM BLDC Motor Structure for Reducing Torque Ripple 원문보기

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토크 리플 저감을 위한 새로운 비대칭 하프-타입 영구자석 매입형 브러시리스 직류 모터 구조
A Novel Asymmetrical Half-type IPM BLDC Motor Structure for Reducing Torque Ripple 원문보기

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