Analysis of cogging torque in brushless machines having nonuniformly distributed stator slots and stepped rotor magnets \ud

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Zhu, Z.Q. ; Ruangsinchaiwanich, S. ; Ishak, D. ; Howe, D. (2005)
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    arxiv: Quantitative Biology::Subcellular Processes

A simple analytical technique is proposed for synthesizing the cogging torque waveform of a permanent magnet brushless machine from the cogging torque waveform that is associated with a single stator slot. The machine may have either uniformly or nonuniformly distributed stator slots and/or a skewed rotor, in which the skew is realized by circumferentially displacing the magnets of each pole. The technique is validated by finite element analysis and measurements.
  • References (4)

    [1] T. M. Jahns and W. L. Soong, “Pulsating torque minimization techniques for permanent magnet AC motor drives: A review,” IEEE Trans. Ind. Electron., vol. 43, no. 2, pp. 321-330, Apr. 1996.

    [2] Z. Q. Zhu and D. Howe, “Influence of design parameters on cogging torque in permanent magnet machines,” IEEE Trans. Energy Convers., vol. 15, no. 4, pp. 407-412, Dec. 2000.

    [3] N. Bianchi and S. Bolognani, “Design techniques for reducing the cogging torque in surface-mounted PM motors,” IEEE Trans. Ind. Appl., vol. 38, no. 5, pp. 1259-1265, Sep.-Oct. 2002.

    [4] D. Ishak, Z. Q. Zhu, and D. Howe, “Influence of slot number and pole number in fault-tolerant brushless DC motors having unequal tooth widths,” J. Appl. Phys., vol. 97, no. 10, p. 10Q509, 2005.

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