Multiple phase claw pole type motor

Abstract

A claw pole type motor includes first and second claw poles opposed to each other and each including a radial yoke portion having an inner diameter side and an outer diameter side, a plurality of pole portions arranged on the inner diameter side, and axially extended, and an outer peripheral side yoke portion extending on the outer diameter side. A stator core is provided having an inner diameter side, and is formed so as to cause the pole portions of the first claw pole to be meshed with the pole portions of the second claw pole. A rotor is arranged on the inner diameter side of the stator core with a circumferential gap being defined therebetween. In order to provide high efficiency while simplifying manufacturing, the first and second claw poles are formed by compacting of magnetic powder.

1 . A claw pole type motor comprising: 
 a first claw pole comprised of a radial yoke portion having an inner diameter side and an outer diameter side, a plurality of pole portions arranged on the inner diameter side, and axially extended, and an outer peripheral side yoke portion extending on the outer diameter side,    a second claw pole comprised of a radial yoke portion having an inner diameter side and an outer diameter side, a plurality of pawl portions arranged on the inner diameter side, and axially extending,    and an outer peripheral side yoke portion arranged on the outer diameter portion,    the first claw pole and the second claw pole being opposed to each other,    a stator core having an inner diameter side, and formed so as to cause the pole portions of the first claw pole to be meshed with the pole portions of the second claw pole, and    a rotor arranged on the inner diameter side of the stator core with a circumferential gap being defined therebetween,    characterized in that:    the plurality of pole portions and the outer peripheral side yoke portions, which are comprised of the first and second claw poles, extend in an axial direction of the motor,    and further the first and second claw poles are formed by compression molding of magnetic powder.    
   
   
       2 . A claw pole type motor as set forth in  claim 1 , characterized in that the first and second claw poles are formed in one and the same shape.  
   
   
       3 . A claw pole type motor as set forth in  claim 1 , characterized in that the pole portions of both first and second claw poles have an axial length which is equal to twice the axial length of the outer peripheral side yoke of the first claw pole.  
   
   
       4 . A claw pole type motor as set forth in  claim 1 , characterized in that the outer peripheral side yoke of the first claw pole and that of the second claw pole are opposed to each other so as to define one outer peripheral surface.  
   
   
       5 . A claw pole type motor as set forth in  claim 1 , characterized in that each of the pole portions of the first and second claw poles has a radial thickness which is gradually decreased from its front end to the associated radial yoke portion.  
   
   
       6 . A claw pole type motor as set forth in  claim 1 , characterized in that the first and second claw pole are formed, one phase part thereof being integrated.