Alternating-current dynamoelectric machine

Abstract

A projected shape of permanent magnets is contained within a plane of projection formed by adjacent claw-shaped magnetic poles overlapping when the claw-shaped magnetic poles are viewed in a direction of rotation of a rotor, and is generally similar in shape to a shape of the plane of projection.

1 . An alternating-current dynamoelectric machine comprising: 
 a stator including: 
 a stator core in which slots extending in an axial direction are formed on an inner peripheral side; and  
 a stator winding mounted to said stator core by winding conducting wires into said slots; and  
   a rotatable rotor including: 
 a field winding disposed inside said stator;  
 a rotor core constituted by a first rotor core portion and a second rotor core portion each having claw-shaped magnetic poles disposed so as to cover said field winding and alternately intermesh with each other; and  
 a plurality of permanent magnets disposed between adjacent claw-shaped magnetic poles and having magnetic fields oriented so as to reduce leakage of magnetic flux between said claw-shaped magnetic poles,  
   wherein:    a projected shape of said permanent magnets is contained within a plane of projection formed by said adjacent claw-shaped magnetic poles overlapping when said claw-shaped magnetic poles are viewed in a direction of rotation of said rotor, and is substantially similar in shape to a shape of said plane of projection.    
     
     
         2 . The alternating-current dynamoelectric machine according to  claim 1 , wherein: 
 a corner portion of said projected shape of said permanent magnets has a curved shape.    
     
     
         3 . An alternating-current dynamoelectric machine comprising: 
 a stator including: 
 a stator core in which slots extending in an axial direction are formed on an inner peripheral side; and  
 a stator winding mounted to said stator core by winding conducting wires into said slots; and  
   a rotatable rotor including: 
 a field winding disposed inside said stator;  
 a rotor core constituted by a first rotor core portion and a second rotor core portion each having claw-shaped magnetic poles disposed so as to cover said field winding and alternately intermesh with each other; and  
 a plurality of permanent magnets disposed between adjacent claw-shaped magnetic poles and having magnetic fields oriented so as to reduce leakage of magnetic flux between said claw-shaped magnetic poles,  
   a portion of a projected shape of said permanent magnets protruding outside a plane of projection formed by said adjacent claw-shaped magnetic poles overlapping when said claw-shaped magnetic poles are viewed in a direction of rotation of said rotor,    wherein:    a radially-innermost point of intersection of corner portions of said permanent magnets is outside a region of said plane of projection and is in a vicinity of an inner peripheral surface of said first rotor core portion or said second rotor core portion.    
     
     
         4 . The alternating-current dynamoelectric machine according to  claim 1 , wherein: 
 facing side surfaces of said adjacent claw-shaped magnetic poles are substantially parallel to each other.    
     
     
         5 . The alternating-current dynamoelectric machine according to  claim 1 , wherein: 
 each of said permanent magnets is constituted by a pair of magnet portions cut substantially parallel to facing side surfaces of said adjacent claw-shaped magnetic poles; and    said magnet portions are separated from each other.    
     
     
         6 . The alternating-current dynamoelectric machine according to  claim 5 , wherein: 
 a dimension parallel to a direction of rotation of said rotor in said magnet portions gradually increases from a root portion of said claw-shaped magnetic poles toward a tip portion.    
     
     
         7 . An alternating-current dynamoelectric machine comprising: 
 a stator including: 
 a stator core in which slots extending in an axial direction are formed on an inner peripheral side; and  
 a stator winding mounted to said stator core by winding conducting wires into said slots; and  
   a rotatable rotor including: 
 a field winding disposed inside said stator;  
 a rotor core constituted by a first rotor core portion and a second rotor core portion each having claw-shaped magnetic poles disposed so as to cover said field winding and alternately intermesh with each other; and  
 a plurality of permanent magnets disposed between adjacent claw-shaped magnetic poles and having magnetic fields oriented so as to reduce leakage of magnetic flux between said claw-shaped magnetic poles,  
   wherein:    each of said permanent magnets is constituted by a pair of magnet portions cut substantially parallel to facing side surfaces of said adjacent claw-shaped magnetic poles;    each of said magnet portions is constituted by a pair of magnet segments cut in a direction of rotation of said rotor; and    a magnet segment near a tip portion of said claw-shaped magnetic poles is constituted by a member having a greater residual magnetic flux density than a magnet segment near a root portion of said claw-shaped magnetic poles.    
     
     
         8 . An alternating-current dynamoelectric machine comprising: 
 a stator including: 
 a stator core in which slots extending in an axial direction are formed on an inner peripheral side; and  
 a stator winding mounted to said stator core by winding conducting wires into said slots; and  
   a rotatable rotor including: 
 a field winding disposed inside said stator;  
 a rotor core constituted by a first rotor core portion and a second rotor core portion each having claw-shaped magnetic poles disposed so as to cover said field winding and alternately intermesh with each other; and  
 a plurality of permanent magnets disposed between adjacent claw-shaped magnetic poles and having magnetic fields oriented so as to reduce leakage of magnetic flux between said claw-shaped magnetic poles,  
   wherein:    each of said permanent magnets is constituted by a pair of magnet portions cut substantially parallel to facing side surfaces of said adjacent claw-shaped magnetic poles;    each of said magnet portions is constituted by a pair of magnet segments cut in a direction of rotation of said rotor; and    a dimension in said direction of rotation is larger in a magnet segment near a tip portion of said claw-shaped magnetic poles than in a magnet segment near a root portion of said claw-shaped magnetic poles.    
     
     
         9 . The alternating-current dynamoelectric machine according to  claim 1 , wherein: 
 an inner peripheral surface of said first rotor core portion and an inner peripheral surface of said second rotor core portion are each constituted by a first peripheral portion near a tip portion of said claw-shaped magnetic poles and a second peripheral portion near a root portion of said claw-shaped magnetic poles bent medially, said first peripheral portion having a larger angle of elevation from a line extending in a radial direction than said second peripheral portions.