Stator for dynamo-electric machine

Abstract

The invention provides a stator for a dynamo-electric machine capable of preventing deterioration of efficiency. In the stator for dynamo-electric machine of which rotor is disposed inside the stator, a stator core 11 comprises: an inside ring core 9 formed annularly by laminating plate-type magnetic members in which a plurality of teeth are provided on one side of a yoke portion, disposing coils 8 in slots each formed between the teeth, bending the plate-type magnetic members so that the coils 8 are located inside, and bringing two end faces into contact with each other; and an outside ring core 10 , being made of magnetic members and formed cylindrical in shape, which is fitted on outside of the inside ring 9 and holds the inside ring core 9.

1 - 19  Canceled.  
     
     
         20 . A method of manufacturing a stator for dynamo-electric machine comprising a rotor disposed inside the stator, said stator comprising a core including an outer ring core having one-piece construction and an inner ring core disposed on an inner surface of the outer ring core, and a plurality of coils disposed on an inner surface of the inner ring core, the method comprising: 
 forming a rectangular core having two end surfaces, and a main surface provided with a plurality of teeth and slots;    disposing the plurality of coils in said slots of the rectangular core;    bending the rectangular core to form the inner ring core wherein the two end surfaces of the rectangular core are contacted to each other and the plurality of teeth and slots and coils are located on an inner surface of said inner core; and    fitting the inner ring core into an inner surface of the outer ring.    
     
     
         21 . The method of manufacturing the stator according to  claim 20 , wherein the step of forming a rectangular core comprises: 
 punching a plurality of magnetic plates to form a plurality of teeth elements and slot elements on one main side of each of said magnetic plates; and    laminating the plurality of the magnetic plates together to form the rectangular core; and    wherein the step of disposing the plurality of coils in said slots of the rectangular core comprises inserting the coils into the slots by winding the coils around said plurality of teeth.    
     
     
         22 . The method of manufacturing the stator according to  claim 21 , wherein the each coil is wound around several adjacent teeth among the plurality of teeth between a bottom part of one of the slots and an upper part of other slots, and the plurality of coils are radially overlapped with each other.  
     
     
         23 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein the outer ring is formed by a plurality of laminated magnetic plate members.  
     
     
         24 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 23 , wherein the laminated magnetic plate members forming the outer ring core are spirally wound.  
     
     
         25 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein a thickness of the laminated magnetic plate members forming the outer ring core is larger than a thickness of the laminated magnetic plate members forming the inner ring core.  
     
     
         26 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein a thickness of the laminated magnetic plate members forming the outer ring core is smaller than a thickness of the laminated magnetic plate members forming the inner ring core.  
     
     
         27 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein the outer ring core is formed shorter than the inner ring core in axial direction and is fitted in central part of the inner ring core.  
     
     
         28 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein a thickness of the outer ring core in a radial direction is larger than that of a yoke portion in the inner ring core.  
     
     
         29 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein a thickness of a yoke portion in the inner ring core in radial direction is larger than that of the outer ring core.  
     
     
         30 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein concave portions extending in axial direction are respectively provided at positions each substantially corresponding to a central part of a bottom portion of each slot on an outside perimeter of the inner ring core.  
     
     
         31 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein concave portions extending in axial direction are respectively provided at positions each substantially corresponding to a central part of a bottom portion of each slot of the inner ring core.  
     
     
         32 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein the outer ring core is formed by integrating a plurality of arc-shaped magnetic members in one piece.  
     
     
         33 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein concave and convex portions engaging with each other are formed on a face where the inner ring core and the outer ring core are fitted to each other.  
     
     
         34 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 33 , wherein the concave and convex portions are formed to dovetail with each other.  
     
     
         35 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein a portion where the inner ring core and the outer ring core are fitted to each other are joined by welding.  
     
     
         36 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 35 , wherein the outer ring core is divided into parts in axial direction and portions where the parts are fitted are joined together by welding.  
     
     
         37 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein a contact portion of the inner ring core is disposed at a position corresponding to each slot.  
     
     
         38 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein a contact portion of the inner ring core is disposed at the teeth.  
     
     
         39 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 38 , wherein width of the teeth where the contact portion of the inner ring core is disposed is formed larger than the other teeth.  
     
     
         40 . The method of manufacturing the stator for dynamo-electric machine as defined in  claim 20 , wherein the laminated magnetic members of the inner ring core which are disposed at two end portions in axial direction are larger than the other laminated magnetic members of the inner ring core.