Stator of rotary electric machine

• US 10,263,484 B2
• Filed: 12/22/2014
• Issued: 04/16/2019
• Est. Priority Date: 12/27/2013
• Status: Active Grant

• Current Assignee: DENSO Corporation, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: DENSO Corporation, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Mizutani, Tetsushi, Kaneshige, Keiichi, Ikemoto, Masayuki, Hatakeyama, Tsutomu, Shichijoh, Akiya
• Primary Examiner(s): Nguyen, Tran N
• Application Number:
  US15/108,070
• Publication Number:
  US 20160329764A1
• Time in Patent Office: 1,576 Days
• CPC Class Codes: H02K 1/146 consisting of a generally annular yoke with salient poles
• CPC Class Codes: H02K 1/16 Stator cores with slots for windings
• CPC Class Codes: H02K 2203/09 Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations
• CPC Class Codes: H02K 2213/03 Machines characterised by numerical values, ranges, mathematical expressions or similar information
• CPC Class Codes: H02K 3/04 Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
• CPC Class Codes: H02K 3/12 arranged in slots
• CPC Class Codes: H02K 3/50 Fastening of winding heads, equalising connectors, or connections thereto

Abstract

A stator for a rotary electric machine includes a stator core, three-phase coils, and a neutral point connection conductor. The three-phase coils are wound around the stator core. The neutral point connection conductor is connected to each of the three-phase coils. The neutral point connection conductor includes a linear conductor that is bent. The linear conductor includes two end portions and an overlapping portion in which the conductor is folded back and doubled up. One of the two end portions is connected to one-phase coil of the three-phase coils. The other of the two end portions is connected to another-phase coil of the three-phase coils. The overlapping portion is connected to the remaining-phase coil of the three-phase coils.

Claims

1. A stator for a rotary electric machine, the stator comprising:

a stator core;

three-phase coils that are wound around the stator core; and

a neutral point connection conductor that is connected to each of the three-phase coils, the neutral point connection conductor including a single continuous linear conductor that is bent, the linear conductor including two end portions and an overlapping portion in which the conductor is folded back and doubled up, wherein the overlapping portion is in a position between the two end portions along a length of the linear conductor, one of the two end portions being connected to one-phase coil of the three-phase coils, the other of the two end portions being connected to another-phase coil of the three-phase coils, and the overlapping portion being connected to the remaining-phase coil of the three-phase coils, wherein

an end portion of the overlapping portion in an axial direction of the stator includes a bent portion resulting from the conductor being folded back, the bent portion being positioned farther in the axial direction of the stator than the two end portions of the linear conductor, wherein an axial length of the overlapping portion is longer than an axial length of each of the two end portions.

2. The stator according to claim 1, wherein the linear conductor is a flat member, having a rectangular cross-section.

3. A stator for a rotary electric machine, the stator comprising:

a stator core;

three-phase coils that are wound around the stator core; and

a neutral point connection conductor that is connected to each of the three-phase coils, the neutral point connection conductor including a single continuous linear conductor that is bent, the linear conductor including two end portions and an overlapping portion in which the conductor is folded back and doubled up, wherein the overlapping portion is in a position between the two end portions along a length of the linear conductor, one of the two end portions being connected to one-phase coil of the three-phase coils, the other of the two end portions being connected to another-phase coil of the three-phase coils, and the overlapping portion being connected to the remaining-phase coil of the three-phase coils, wherein

an end of the overlapping portion in an axial direction of the stator included a bent portion resulting from the conductor being folded back, the bent portion being positioned farther in the axial direction of the stator than the two end portions of the linear conductor, wherein the overlapping portion is folded back on itself so that a first part of the overlapping portion is disposed radially outward from a second part of the overlapping portion, the first part and the second part overlap in a radial direction.

4. The stator according to claim 3, wherein the linear conductor is a flat member, having a rectangular cross-section.