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STATOR FOR MOTOR

  • US 20080191576A1
  • Filed: 02/12/2008
  • Published: 08/14/2008
  • Est. Priority Date: 02/13/2007
  • Status: Active Grant
First Claim
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1. A stator for a motor comprising:

  • a stator core including an annular yoke and a magnetic pole constituent member fitted inside the annular yoke; and

    a plurality of excitation winding portions disposed at the magnetic pole constituent member,the yoke and the magnetic pole constituent member being respectively formed by lamination of a plurality of magnetic steel plates,the magnetic pole constituent member including;

    a plurality of pole columns disposed inside the annular yoke at intervals in a circumferential direction of the yoke and respectively mounted with the excitation winding portions, the pole columns each having an outer end connected to the yoke and an inner end located more inward than the outer end in a radial direction of the yoke;

    a plurality of magnetic pole surface forming portions respectively disposed at the inner ends of the pole columns, the magnetic pole surface forming portions each having a magnetic pole surface; and

    a plurality of connecting sections that respectively connect adjacent two of the magnetic pole surface forming portions,the yoke having an inner peripheral surface portion wherein a plurality of fitting recessed portions are formed so as to be open toward both sides of a laminating direction of the magnetic steel plates and also toward the magnetic pole constituent member, the fitting recessed portions being fitted with the outer ends of the pole columns, and wherein a plurality of paired flat-surface portions are also formed, the paired flat-surface portions being respectively continuous with an inner surface of the fitting recessed portion and respectively disposed on either side of the fitting recessed portion in the circumferential direction,the excitation winding portions each including a bobbin that is made of an insulating material and is fitted with the pole column, and a winding conductor wound around the bobbin,the bobbin integrally including;

    a cylindrical portion that is fitted with the pole column, and wound with the winding conductor;

    a first flange portion disposed at one end of the cylindrical portion and having paired flat portions that respectively come into contact with the paired flat-surface portions of the yoke; and

    a second flange portion disposed at the other end of the cylindrical portion and coming into contact with the magnetic pole surface constituent member,the first flange portion including a first connecting portion that connects corresponding ends of the paired flat portions and a second connecting portion that connects other corresponding ends of the paired flat portions,the first connecting portion integrally including a projecting portion that passes through the fitting recessed portion and comes out therefrom when the outer ends of the pole columns of the magnetic pole constituent member come into engagement with fitting recessed portions.

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