[논문]A Study on the Detent Torque Reduction of Claw Pole Permanent Magnet Type Motor

Jung, Dae-Sung; Lee, Ju; Lee, Sang-Taek

doi:10.5207/jieie.2013.27.12.125

Abstract ▼ AI-Helper

This paper has done a three-dimensional FEM analysis of the PM claw pole stepping motor. As magnetization happens in the z-axis, which does not have a constant value, three-dimensional FEM analysis is necessary for characteristic analysis of PM claw pole stepping motors. Because it is a type of perm...

This paper has done a three-dimensional FEM analysis of the PM claw pole stepping motor. As magnetization happens in the z-axis, which does not have a constant value, three-dimensional FEM analysis is necessary for characteristic analysis of PM claw pole stepping motors. Because it is a type of permanent magnet motor, the PM claw pole stepping motor naturally has a detent torque. This torque is known to show negative effects on motor performance. To improve motor performance, reducing the detent torque is very important during the motor design. This paper applied DOE for optimization of stator pole design of the motor. Also, we compared motor performance by applying a different type of rotor shape, dividing the permanent magnet. To verify the simulation results, an experiment was done.

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가설 설정

While the holding torque reduced by 6%, the detent torque shows a 44% reduction. This can be explained by the flux leakage made by dividing permanent magnets as shown in Figure 7. Physically, the holding torque reduces proportional to the flux, while the detent torque reduces proportional to the square of the flux. Based on this fact, there is a significant improvement in reducing the detent torque.

제안 방법

The analysis model of this paper is a product applied for ODD drive, which has a smaller size, reduced poles, and low power compared to the general PM type claw pole step motors. Because of its small size, the motor will show high variances to small changes of design parameters.
However, for a motor that has a small size, applying these methods is impossible from an industrial view. Therefore, a new method should be introduced for this specific model, small PM type claw pole stepping motor, to reduce the detent torque. In this study, even though a reduction of holding torque takes place, the detent torque will be reduced to 0.
Compared to the conventional model, the proposed model shows a lower flux density at the teeth region. Therefore, the proposed model of this study has reduced the detent torque while also distributing the flux for a wider region compared to conventional models. Although the holding torque has been reduced, the holding torque does show a sinusoidal distribution.

대상 데이터

The stator is based on optimization of DOE, and the rotor has a permanent magnet divided into two pieces. The analysis model has 300,000 elements and 80,000 nodes. In the case of 3D analysis, the accuracy of the analysis strongly depends on the number of elements.

이론/모형

is the current density. The magnetic saturation of iron is taken into account by the Newton Raphson Method.

성능/효과

Considering manufacturing cost and process implementation, the rotor that has a bisected permanent magnet (Proposal Rotor I) was selected. The detent torque and holding torque analysis results of the conventional rotor and proposal rotor is shown in Figures 5 and 6. While the holding torque reduced by 6%, the detent torque shows a 44% reduction. This can be explained by the flux leakage made by dividing permanent magnets as shown in Figure 7.

참고문헌 (4)

Tatsuya Kikuchi and Takashi Kenjo. "Developing an Educational Simulation Program for the PM Stepping Motor." IEEE Transaction on Education, Vol. 45, No. 1. pp. 70-78. February 2002.

상세보기
Ki-Bong Jang and Ju Lee. "FE Analysis of Hybrid Stepping Motor (HSM)." KIEE International Transactions on Electrical Machinery and Energy Conversion Systems, Vol. 5-B, No. 1. pp. 39-42. 2005.
Dae-Sung Jung, S.B. Lim, K.C. Kim, J.S. Ahn, S.C. Go, Y.G. Son, and Ju Lee. "Optimization for Improving Static Torque Characteristic in Permanent Magnet Stepping Motor with Claw Poles." IEEE Transaction on Magnetics, Vol. 43, No. 4. April 2007.
Takeo Ishikawa and Ryuichi Takakusagi. "Static Torque Characteristics of Permanent Magnet Type Stepping Motor with Claw Poles." IEEE Transaction on Magnetics, Vol. 36, No. 4 pp. 1854-1857. July 2000.

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