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Hybrid stepping motor, driving method for the same and coil winding method for the same

  • US 5,444,316 A
  • Filed: 07/27/1993
  • Issued: 08/22/1995
  • Est. Priority Date: 07/31/1992
  • Status: Expired due to Term
First Claim
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1. A ten-phase hybrid stepping motor comprising:

  • a rotor having rotor teeth, the rotor having an axial direction, a circumferential direction and a radial direction perpendicular to the axial direction, the rotor teeth including N pole teeth and S pole teeth alternatively arranged in the circumferential direction of the rotor at constant intervals, the rotor teeth having a rotor tooth pitch, the rotor tooth pitch being equal to a pitch between two adjacent N or S pole teeth;

    a stator having Nos. 1-20 main poles, the main poles surrounding the rotor in circumferential direction of the rotor, each main pole extending toward the rotor in the radial direction of the rotor, each main pole having a free end and a center line in its extending direction, a stator tooth being formed at the free end of each main pole, the stator teeth facing the rotor teeth; and

    a coil around each main pole for excitation of the main pole, whereby stepping motion of the rotor is realized upon excitation of the main poles, the magnitude of stepping pitch being obtained by dividing the rotor tooth pitch by ten,Nos. 1-10 main poles and Nos. 11-20 main poles facing each other in radial direction of the rotor respectively, an arbitrary main pole and a fifth next main pole having a 90-degree relation, andthe teeth on Nos. 1-10 main poles and those on Nos. 11-20 main poles respectively having positions determined by the following expression;

    
    
    space="preserve" listing-type="equation">Pt×

    k+m×

    Θ

    where Pt represents the rotor tooth pitch, Θ

    represents the magnitude of the stepping pitch, m represents an integer between 0 and 9 but different from k;

    k represents an arbitrary integer between 0 and K-1 and K represents a number of N pole teeth.

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