Results 141 to 150 of about 803 (181)

Cogging torque of permanent magnet electric machiens: An overview

2009 Canadian Conference on Electrical and Computer Engineering, 2009
Permanent magnet electric machine (PMEM) is widely employed in variety of applications because of their numerous advantages beyond other electric machines. Cogging torque is caused by the reluctance change between the stator teeth and magnet poles on the rotor, this is an inherent characteristic of PMEM.
Zhenhong Guo, Liuchen Chang, Yaosuo Xue
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Cogging torque and torque ripple reduction of modular permanent magnet machines

2016 XXII International Conference on Electrical Machines (ICEM), 2016
In order to minimize the cogging torque and torque ripple for surface mounted permanent magnet (SPM) machines, this paper proposes a C-core modular stator which can be obtained by inserting flux gaps (FGs) into every stator tooth. The electromagnetic performances of C-core modular PM machines such as open-circuit flux linkage, phase back-EMF, cogging ...
G. J. Li, B. Ren, Z. Q. Zhu
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Analytical prediction of the cogging torque and torque constant of a hybrid stepping motor

Journal of Magnetism and Magnetic Materials, 2002
We present an analytic method to efficiently calculate the torque constant and cogging torque of a hybrid stepping motor. The feature of the proposed method is its computational efficiency in that it is a useful tool for the motor design which is aimed at reducing the level of cogging torque or increasing the torque constant. This method is verified by
Shyh-Jier Wang, Shir-Kuan Lin
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Torque and cogging torque in sandwich type CD-ROM spindle motor

IEEE Transactions on Magnetics, 1998
The sandwich type CD-ROM spindle motor has intrinsic dominance of manufacture and cost. This paper will propose a reference formula of torque constant Kt according to the experimental results, accounting for the mechanism of dead point, and finally introducing a design method to prevent dead point and to reduce the cogging torque.
C.M. Chao, S.J. Wang, C.P. Liao, D.R. Huang, T.F. Ying   +4 more
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Permanent magnet shaping for cogging torque and torque ripple reduction of PMSM

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2018
Purpose This paper aims to the improvement of permanent magnet shape in the popular permanent magnet synchronous machine (PMSM) is proposed in this paper in view to mitigate cogging torque magnitude and torque ripple. Design/methodology/approach A two-dimensional exact analytical approach of magnetic field distribution is established for the PMSM ...
Brahim Ladghem Chikouche, Kamel Boughrara, Rachid Ibtiouen   +2 more
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Reduction of cogging torque in permanent magnet motors

IEEE Transactions on Magnetics, 1988
Cogging torque in a permanent magnet motor, which arises from the interaction of the rotor magnets with the steel teeth on the stator, can be reduced by skewing the stator teeth, but only at the expense of added complexity in stator construction and some loss of output torque.
null Touzhu Li, G. Slemon
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Cogging torque in SPM machine with segmented stator

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 2016
Purpose – The purpose of this paper is to evaluate the cogging torque in a surface-mounted permanent magnet (SPM) machine with both uniformly and non-uniformly segmented stator cores and to find out the optimal solution of stator core segmenting. Design/methodology/approach
Jian-Xin Shen, Shun Cai, Jian Yuan, Shuai Cao, Cen-Wei Shi   +4 more
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A method to reduce the cogging torque of spindle motors

Journal of Magnetism and Magnetic Materials, 2000
Abstract The cogging torque of a spindle motor can be reduced by arcing the salient poles of the stator or by modifying the magnetization profile of the rotor magnet. By arcing the shape of the salient poles, the cogging torque can be reduced to a specific amount.
Yin-Kwang Lin, Yeong-Nang Hu, Tsung-Kun Lin, Hsing-Nang Lin, Yeong-Hwa Chang, Chi-Yang Chen, Shyh-Jier Wang, Tai-Fa Ying   +7 more
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Boundary element method in reduction of cogging torque

IEEE Transactions on Magnetics, 1998
A method to optimize the cogging torque of a brushless motor with parallel magnetized magnets is presented. The technique is based on the boundary element method. The optimal width of the magnet and the optimal shifts of the consecutive magnets are computed.
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EFFECT OF SKEWING ON THE COGGING TORQUE IN INDUCTION MACHINES

Electric Machines & Power Systems, 1994
ABSTRACT This paper presents a simplified method to predict the cogging torque in induction machines including the skewing effect An equivalent circuit including die effect of both slot harmonics and rotor skewing is developed. A special attention is paid to study the skewing effect on the machine behaviour especially at starting instant. Moreover, the
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