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| Influence of Unequal Teeth Tips Width and Alternate Winding on Torque Characteristics in Direct Drive Table Motor |
| Dong Ting, Huang Wei, Wang Chengyuan |
| Shenyang University of Technology Shenyang 110870 China |
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Abstract To satisfy the requirement of the low speed high torque permanent magnet synchronous motor(PMSM) used in the numerical control(NC) table, the similar pole and slot number multipolar PMSM with unequal teeth tips width and alternate winding is researched and designed in this paper. This kind of motors can operate with lower speed. The structure of similar pole and slot number can increase the winding pitch coefficient, and reduce its inherent cogging torque ripple effectively. And the unequal teeth tips width and alternate winding structure optimize the stator teeth flux linkage and winding coefficient, as a result, the torque density is increased. Furthermore, the influences of unequal teeth tips width structure on the cogging torque ripple and harmonic winding coefficient are analyzed. The finite element method software ANSYS and experiment are employed to analyze the proposed motor. The results prove that the cogging torque ripple of the proposed motor is less than 1% of its rated torque, and the unequal teeth structure can increase the average torque compared with the equal teeth one. Therefore, these results prove that the design method in the paper is correct and effective.
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Received: 23 July 2009
Published: 04 March 2014
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2010, Vol. 25 
