Coil assembly of rotating electrical machinery and method for producing the same, and stator of rotating electric machinery using the same coil assembly

A coil assembly of rotating electrical machinery, which is mounted in a plurality of slots formed on the circumferential surface of an iron core at appointed pitches P, having a plurality of coil combinations, in which the respective coil combinations comprises a combination of a first coil member to a fourth coil member;

• wherein each of said first coil member to said fourth coil member includes:
• a plurality of first linear portions disposed at pitches equal to “N” times (“N” is any natural number) said pitches P and respectively inserted in one of said plurality of slots;
• a plurality of second linear portions disposed at pitches equal to “N” times said pitches P, positioned at the middle of said respective first linear portions and inserted into one of said plurality of slots;
• a plurality of first turning portions for coupling said respective first linear portions with said respective second linear portions adjacent to one side of said respective first liner portions at one end side of said slots;
• and
• a plurality of second turning portions for coupling said respective first linear portions with said respective second linear portions adjacent to other side of said respective first liner portions at the other end side of said slots;
• wherein said respective first portions, first turning portions, second linear portions and second turning portions are formed so as to be continued to each other by one strip member;
• said first coil member and second coil member are combined so that in an appointed slot of said plurality of slots, the first linear portion of said first coil members is located in the first layer and the second linear portion of said second coil members is located in the fourth layer, and, in a slot separated by “N” slots from said appointed slot, the first linear portion of said second coil member is located in the first layer and the second linear portion of said first coil member is located in the fourth layer;
• and
• said third coil member and fourth coil member are combined so that in the appointed slot of said plurality of slots, the first linear portion of said third coil members is located in the second layer and the second linear portion of said fourth coil members is located in the third layer, and, in the slot separated by “N” slots from said appointed slot, the first linear portion of said fourth coil member is located in the second layer and the second linear portion of said third coil member is located in the third layer.

A method for producing a coil assembly of rotating electrical machinery, comprising the steps of:

• winding step for winding a plurality of strip members coaxial with each other so that said plurality of strip coil members, respectively, are provided with:
• a plurality of the first linear portions located on the first plane;
• a plurality of the second linear portions located at the second plane parallel to said first plane;
• a plurality of the first turning portions for coupling said respective first linear portions with said respective second linear portions adjacent to one side of said respective first liner portions;
• and a plurality of the second turning portions for coupling said respective first linear portions with said second linear portions adjacent to the other side of said respective first liner portions and
• displacing step for displacing said respective first linear portions on said first plane and said second linear portions on the second plane so that these linear portions move in parallel to each other, by displacing the first end portions of said respective first linear portions of said plurality of coil members on said first plane, and the first end portions of said respective second linear portions thereof on said second plane in the direction opposed to each other, and concurrently displacing the second end portions of said respective linear portions of said respective coil members on said second plane and the second end portions of said respective first linear portions thereof on said first plane in the direction opposed to each other;
• wherein in said displacing step, a plurality of coil assemblies in which two coil members of said plurality of coil members are combined are formed, said respective coil assemblies have said respective second linear portions of the second coil members positioned on said respective first linear portions of the first coil members, and have said respective first linear portions of said second coil members positioned below said respective second linear portions of said first coil members.

A method for producing a coil assembly of rotating electrical machinery, comprising the steps of:

• bending step for forming a plurality of linear portions and a plurality of inclined portions in the form such that they are inclined at an appointed angle with respect to respective adjacent linear portions between said adjacent linear portions and said inclined portion is placed therebetween, by bending a plurality of strip coil members almost parallel to each other on a certain plane a plurality of times;
• and
• folding and overlapping step for folding and overlapping the respective coil members of said respective inclined portions one after another at the position where said coil members are equally divided into one half section and the other half section in its lengthwise direction so that said other half section crosses and overlaps said one half section at said appointed angle;
• wherein, in said folding and overlapping step, a plurality of coil combinations in which two coil members of said plurality of coil members are combined are formed, said respective coil combinations have said respective second linear portions of said second coil members positioned on respective first linear portions of said first coil members, and have respective first linear portions of said second coil members positioned below respective second linear portions of said first coil members.

A stator of rotating electric machinery comprising

• a stator iron core having a plurality of slots formed along the circumferential surface at appointed pitches P and
• a coil assembly mounted the slots of said stator iron core, and having a plurality of coil combinations, in which the respective coil combinations comprises a coil combinations of a first coil members and a second coil members,
• wherein each of said first coil members and said second coil members including:
• a plurality of first linear portions disposed at pitches equal to “N” times (“N” is any natural number) said pitches P and respectively inserted in one of said plurality of slots;
• a plurality of second linear portions disposed at pitches equal to “N” times said pitches P, positioned at the middle of said respective first linear portions and inserted into one of said plurality of slots;
• a plurality of first turning portions for coupling said respective first linear portions with said respective second linear portions adjacent to one side of said respective first liner portions thereto at one end side of said slots;
• and
• a plurality of second turning portions for coupling said respective first linear portions with said respective second linear portions adjacent to the other side of said respective first liner portions at the other end side of said slots;
• wherein said respective first linear portions, first turning portions, second linear portions and second turning portions are formed so as to be continued to each other by one strip member;
• and
• said first coil member and second coil member are combined so that in an appointed slot of said plurality of slots, the first linear portion of said first coil members is located at the inner layer side and the second linear portion of said second coil members is located at the outer layer side, and, in a slot separated by “N” slots from said appointed slot, the first linear portion of said second coil member is located at the inner layer side and the second linear portion of said first coil member is located at the outer layer side.