Alternator with identical conductor segments

• US 7,342,340 B2
• Filed: 07/27/2004
• Issued: 03/11/2008
• Est. Priority Date: 01/29/2004
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Kashihara, Toshiaki, Higashino, Kyoko
• Primary Examiner(s): TAMAI, KARL I
• Application Number:
  US10/898,946
• Publication Number:
  US 20050168093A1
• Time in Patent Office: 1,323 Days
• Field of Search: 310/201, 310/184
• US Class Current: 310/201
• CPC Class Codes: H02K 15/0025 Shaping or compacting conductors or winding heads after the installation of the winding in the core or machine methods or apparatus for simultaneously twisting a plurality of hairpins prior to mounting H02K15/0428; Applying fastening means on winding heads
• CPC Class Codes: H02K 3/12 arranged in slots
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

In an automotive alternator according to the present invention, conductor segments of an inner winding portion and conductor segments of an outer winding portion have substantially the same shape.

Claims

1. An alternator comprising:

a rotor in which north-seeking (N) and south-seeking (S) poles are formed alternately in a direction of rotation;

a stator having;

a stator core surrounding said rotor; and

a stator winding mounted in a plurality of slots formed so as to extend in an axial direction of said stator core at a distance from each other in a circumferential direction,

said stator winding being constructed such that a plurality of conductor segments are connected to each other, said conductor segments each being formed into a substantial U shape composed of a pair of straight portions housed inside said slots, a linking portion linking said straight portions to each other, and joining portions disposed on tip portions of said straight portions and projecting outward from a first end surface of said stator core,

said stator winding being constituted by;

an inner winding portion comprising;

a joining portion coil end having a plurality of connection portions in which a joining portion of said conductor segments projecting outward from a radially innermost layer inside said slots and a joining portion of said conductor segments projecting outward from a layer immediately outside said radially innermost layer in slots a predetermined number of slots away in a circumferential direction are connected, and said plurality of connection portions are each arranged in a row in a circumferential direction; and

a linking portion coil end in which said linking portions of a plurality of said conductor segments projecting outward at a second end surface of said stator core from a radially innermost layer inside said slots and a layer immediately outside said radially innermost layer in slots a predetermined number of slots away in a circumferential direction are each arranged in a row in a circumferential direction; and

an outer winding portion comprising;

a joining portion coil end having a plurality of connection portions in which a joining portion of said conductor segments projecting outward from a radially outermost layer inside said slots and a joining portion of said conductor segments projecting outward from a layer immediately inside said radially outermost layer in slots a predetermined number of slots away in a circumferential direction are connected, and said plurality of connection portions are each arranged in a row in a circumferential direction; and

a linking portion coil end in which said linking portions of a plurality of said conductor segments projecting outward at a second end surface of said stator core from a radially outermost layer inside said slots and a layer immediately inside said radially outermost layer in slots a predetermined number of slots away in a circumferential direction are each arranged in a row in a circumferential direction,

wherein;

an overall length of said conductor segments of said inner winding portion is equal to an overall length of said conductor segments of said outer winding portion, and

said inner winding portion and said outer winding portion are configured such that said linking portions of said conductor segments of said inner winding portion are deformed outward while said linking portions of said conductor segments of said outer winding portion are not deformed.

2. The alternator according to claim 1, wherein:

the axial length of said joining portion coil end and said linking portion coil end of said inner winding portion is longer than the axial length of said joining portion coil end and said linking portion coil end of said outer winding portion.

3. The alternator according to claim 1, wherein said conductor segments of said inner winding portion are interchangeable with said conductor segments of said outer winding portion.

4. An alternator comprising:

a rotor in which north-seeking (N) and south-seeking (S) poles are formed alternately in a direction of rotation;

a stator having;

a stator core surrounding said rotor; and

a stator winding mounted in a plurality of slots formed so as to extend in an axial direction of said stator core at a distance from each other in a circumferential direction,

said stator winding being constructed such that a plurality of conductor segments are connected to each other, said conductor segments each being formed into a substantial U shape composed of a pair of straight portions housed inside said slots, a linking portion linking said straight portions to each other, and joining portions disposed on tip portions of said straight portions and projecting outward from a first end surface of said stator core,

said stator winding being constituted by;

an inner winding portion comprising;

a joining portion coil end having a plurality of connection portions in which a joining portion of said conductor segments projecting outward from a radially innermost layer inside said slots and a joining portion of said conductor segments projecting outward from a layer immediately outside said radially innermost layer in slots a predetermined number of slots away in a circumferential direction are connected, and said plurality of connection portions are each arranged in a row in a circumferential direction; and

a linking portion coil end in which said linking portions of a plurality of said conductor segments projecting outward at a second end surface of said stator core from a radially innermost layer inside said slots and a layer immediately outside said radially innermost layer in slots a predetermined number of slots away in a circumferential direction are each arranged in a row in a circumferential direction; and

an outer winding portion comprising;

a joining portion coil end having a plurality of connection portions in which a joining portion of said conductor segments projecting outward from a radially outermost layer inside said slots and a joining portion of said conductor segments projecting outward from a layer immediately inside said radially outermost layer in slots a predetermined number of slots away in a circumferential direction are connected, and said plurality of connection portions are each arranged in a row in a circumferential direction; and

a linking portion coil end in which said linking portions of a plurality of said conductor segments projecting outward at a second end surface of said stator core from a radially outermost layer inside said slots and a layer immediately inside said radially outermost layer in slots a predetermined number of slots away in a circumferential direction are each arranged in a row in a circumferential direction,

wherein;

an overall length of said conductor segments of said inner winding portion is equal to an overall length of said conductor segments of said outer winding portion, and

said inner winding portion and said outer winding portion are configured such that said linking portions of said conductor segments of said outer winding portion are deformed inward while said linking portions of said conductor segments of said inner winding portion are not deformed.

5. The alternator according to claim 4, wherein:

the axial length of said joining portion coil end and said linking portion coil end of said inner winding portion is longer than the axial length of said joining portion coil end and said linking portion coil end of said outer winding portion.

6. The alternator according to claim 4, wherein said conductor segments of said inner winding portion are interchangeable with said conductor segments of said outer winding portion.