Armature coil and method of manufacturing the same

• US 9,960,650 B2
• Filed: 04/26/2013
• Issued: 05/01/2018
• Est. Priority Date: 04/26/2013
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Tamura, Koji, Tamura, Shuichi, Yamamura, Akihiro, Doi, Issei, Matsuo, Hiroyuki, Nishimura, Yasukazu, Kawasaki, Sachiko, Mori, Akihiko
• Primary Examiner(s): Luks, Jeremy
• Application Number:
  US14/650,335
• Publication Number:
  US 20150311757A1
• Time in Patent Office: 1,831 Days
• Field of Search: 310180, 310184, 310208
• CPC Class Codes: H02K 1/16 Stator cores with slots for windings
• CPC Class Codes: H02K 15/04 of windings, prior to mounting into machines insulating windings H02K15/10, H02K15/12
• CPC Class Codes: H02K 15/0407 Windings manufactured by etching, printing or stamping the complete coil
• CPC Class Codes: H02K 15/0414 Windings consisting of separate elements, e.g. bars, hairpins, segments, half coils
• CPC Class Codes: H02K 15/0421 consisting of single conductors, e.g. hairpins
• CPC Class Codes: H02K 3/12 arranged in slots
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49073 by assembling coil and core
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing
• CPC Class Codes: Y10T 29/53235 Means to fasten by deformation
• CPC Class Codes: Y10T 29/5327 Means to fasten by deforming

Abstract

In an armature coil according to the present invention and, more particularly, in an armature coil including a plurality of coil conductors wound around a plurality of slots which are formed in a stator core and opened on the radially inner side, the circumferential width of the plurality of the coil conductors is formed in a substantially trapezoidal shape which gets narrower toward the radially inner side and the cross-sectional areas of the plurality of the coil conductors in the slot are each substantially the same and the circumferential width thereof is formed narrower as the coil conductor is arranged toward the radially inner side; and one coil conductor is formed in a convex shape and another coil conductor is formed in a concave shape along the convex shape.

Claims

1. An armature coil in which a plurality of slots through which coil conductors pass are annularly arranged and a plurality of said coil conductors pass through the inside of said slot in line,

wherein, the circumferential width of the plurality of said coil conductors is formed in a substantially trapezoidal shape which gets narrower toward the radially inner side and the cross-sectional areas of the plurality of said coil conductors in said slot are each substantially the same and the circumferential width thereof is formed narrower as said coil conductor is arranged toward the radially inner side;

and

a coil conductor is formed in a convex shape on a surface abutting another coil conductor and the another coil conductor is formed in a concave shape on a surface abutting the convex shaped surface on the coil conductor,

wherein a cross-sectional shape of the plurality of coil conductors is symmetrical, wherein the number of said coil conductors is three or more, each having a convex shape, and the convex shape has a larger amount of protrusion of the convex shape on coil conductors on the radially inner side as compared to coil conductors on the radially outer side.

2. The armature coil according to claim 1,

wherein the convex shape between said coil conductors is formed in a convex shape toward the radially inner side.

3. The armature coil according to claim 1,

wherein the convex shape between said coil conductors is formed in a convex shape toward the radially outer side.

4. The armature coil according to claim 1,

wherein said coil conductors form a polyphase winding and each of said coil conductors have a convex or a concave shape on a surface abutting another of the coil conductors, and

the direction of the convex shape and the concave shape of the coils is the same for at least same phase windings.

5. The armature coil according to claim 1, wherein each coil conductor is a single strand conductor.

6. An armature coil in which a plurality of slots through which coil conductors pass are annularly arranged and a plurality of said coil conductors pass through the inside of said slot in line,

wherein, the circumferential width of the plurality of said coil conductors is formed in a substantially trapezoidal shape which gets narrower toward the radially inner side and the cross-sectional areas of the plurality of said coil conductors in said slot are each substantially the same and the circumferential width thereof is formed narrower as said coil conductor is arranged toward the radially inner side;

and

a coil conductor is formed in a convex shape on a surface abutting another coil conductor and the another coil conductor is formed in a concave shape on a surface abutting the convex shaped surface on the coil conductor,

wherein a cross-sectional shape of the plurality of coil conductors is symmetrical,

wherein the direction of curvature of the convex shape of said one coil conductor in one slot is formed in a different direction in a corresponding coil conductor in an adjacent slot.