Armature windings and dynamo-electric machine using the same

Abstract

An armature winding includes a plurality of strand groups each having strands transposed and bound in at least two rows and multiple tiers, and a main insulator for covering the strand group. A flow resistance of a current passing though the strands on an upper and a lower side in the cross-section of the strand group is set larger than a flow resistance of a current which passes through the strands in a central portion, or a flow resistance of a current passing through at least one of the plurality of strand groups is set larger than a flow resistance of a current passing through the remaining strand groups.

1 . An armature winding comprising: 
 a strand group having strands transposed and bound in at least two rows and multiple tiers; and    a main insulator for covering said strand group,    wherein a flow resistance of a current passing though said strands on an upper and a lower side in the cross-section of said strand group is set larger than a flow resistance of a current which passes through said strands in a central portion.    
   
   
       2 . An armature winding comprising: 
 a strand group having strands transposed and bound in at least two rows and multiple tiers; and    a main insulator for covering said strand group,    wherein said strands on an upper and a lower side in the cross-section of said strand group are formed to have a smaller cross-sectional area than a cross-sectional area of said strands in a central portion.    
   
   
       3 . An armature winding comprising: 
 a strand group having strands stranded and bound in at least two rows and multiple tiers, said strands including solid strands and hollow strands through which a cooling medium passes; and    a main insulator for covering said strand group, wherein said hollow strands are intensively arranged on an upper and a lower side in the cross-section of said strand group, and said solid strands are intensively arranged in a central portion.    
   
   
       4 . An armature winding comprising: 
 a strand group having strands transposed and bound in at least two rows and multiple tiers, said strands including solid strands and hollow strands through which a cooling medium passes; and    a main insulator for covering said strand group,    wherein said hollow strands are intensively arranged only on an upper side in the cross-section of said strand group, and said solid strands are arranged in the remaining area.    
   
   
       5 . An armature winding comprising: 
 a plurality of strand groups each having strands transposed and bound in at least two rows and multiple tiers; and    a main insulator for covering said plurality of strand groups,    wherein a flow resistance of a current passing though at least one of said plurality of strand groups is set larger than a flow resistance of a current which passes through the remaining strand groups.    
   
   
       6 . An armature winding comprising: 
 a plurality of strand groups each having strands transposed and bound in at least two rows and multiple tiers; and    a main insulator for covering said plurality of strand groups,    wherein a cross-sectional area of strands belonging to at least one strand group in the cross-section of said plurality of strand groups is smaller than a cross-sectional area of strands belonging to the remaining strand groups.    
   
   
       7 . An armature winding comprising: 
 a plurality of strand groups each having strands transposed and bound in at least two rows and multiple tiers, said strands including solid strands and hollow strands through which a cooling medium passes; and    a main insulator for covering said plurality of strand groups,    wherein a flow resistance of a current passing through at least one strand group of said plurality of strand groups is set larger than a flow resistance of a current passing through the remaining strand groups.    
   
   
       8 . An armature winding comprising: 
 a plurality of strand groups each having strands transposed and bound in at least two rows and multiple tiers, said strands including solid strands and hollow strands through which a cooling medium passes; and    a main insulator for covering said plurality of strand groups,    wherein a cross-sectional area of strands belonging to at least one strand group in the cross-section of said plurality of strand groups is smaller than a cross-sectional area of strands belonging to the remaining strand groups.    
   
   
       9 . An armature winding comprising: 
 a plurality of strand groups each having strands transposed and bound in at least two rows and multiple tiers, said strands including solid strands and hollow strands through which a cooling medium passes; and    a main insulator for covering said plurality of strand groups,    wherein the hollow strands in at least one of said plurality of strand groups have a water pass area smaller than a water pass area of the hollow strands in the remaining strand groups.    
   
   
       10 . An armature winding comprising: 
 a plurality of strand groups each having strands transposed and bound in at least two rows and multiple tiers, said strands including solid strands and hollow strands through which a cooling medium passes; and    a main insulator for covering said plurality of strand groups,    wherein said hollow strands are arranged on an upper side and a lower side in the cross-section of at least one of said plurality of strand groups, said solid strands are arranged in a central portion, and said solid strands and said hollow strands are mixed in the remaining strand groups.    
   
   
       11 . An armature winding comprising: 
 three strand groups each having strands transposed and bound in at least two rows and multiple tiers, said strands including solid strands and hollow strands through which a cooling medium passes; and    a main insulator for covering said three strand groups,    wherein said strands belonging to a strand group positioned on one side of a strand group positioned at the center of said three strand groups have a cross-sectional area smaller than a cross-sectional area of said strands belonging to said central strand group, and said strand belonging to a strand group positioned on the other side of said central strand group has a cross-sectional area larger than the cross-sectional area of said strands belong to said central strand group.    
   
   
       12 . A dynamo-electric machine comprising: 
 a rotor core;    a rotor including a field winding stored in a slot of said rotor core; and    a stator disposed opposite to said rotor with a predetermined gap therebetween, and including a stator core, and an armature winding according to any of  claims 1  to  11  stored in a slot of said stator core.    
   
   
       13 . A dynamo-electric machine comprising: 
 a rotor core;    a rotor including a field winding stored in a slot of said rotor core; and    a stator disposed opposite to said rotor with a predetermined gap therebetween, and including a stator core, and armature windings stored in a slot of said stator core, said armature windings including a bottom coil and a top coil stored in the slot of said stator core, said bottom coil and said top coil comprising armature windings according to any of  claims 7  to  9 .    
   
   
       14 . A dynamo-electric machine comprising: 
 a rotor core;    a rotor including a field winding stored in a slot of said rotor core;    and a stator disposed opposite to said rotor with a predetermined gap therebetween, and including a stator core, and an armature winding stored in a slot of said stator core, said armature winding including a bottom coil and a top coil stored in the slot of said stator core, said bottom coil comprising an armature winding according to any of  claims 7  to  9 , said top coil comprising an armature winding which has strand groups disposed opposite to the strand groups of said bottom coil.