Stator for rotary electric machine

Patent metadata

Field	Value
Publication number	US-10063118-B2
Application number	US-201314782959-A
Country	US
Kind code	B2
Filing date	Apr 8, 2013
Priority date	Apr 8, 2013
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

The rotary electric machine includes concentrated winding coil that is configured by winding a conductor wire around a tooth for multiple laps so as to pass through a concave space that is formed by trunk portions and first and second flange portions of first and second insulators, a crossover points of the conductor wire being formed on a coil end of the concentrated winding coil that is positioned above the first insulator, slot-housed portions of the concentrated winding coil that are positioned on two circumferential sides of the tooth being configured such that the conductor wire is arranged in a staggered stacking pattern in multiple rows and in multiple layers, and a varnish being applied to the coil end that is positioned above the first insulator.

First claim

The invention claimed is:

1. A stator for a rotary electric machine comprising:
a plurality of core segments that each have a circular arc-shaped back yoke portion and a tooth, said plurality of core segments being arranged into an annular shape by butting together circumferential side surfaces of said back yoke portions;
a cylindrical frame into an inner circumferential side of which said plurality of core segments that are arranged into said annular shape are inserted and held;
first and second insulators that each have a trunk portion and first and second flange portions that are linked to two longitudinal ends of said trunk portion, said first and second insulators being disposed such that bottom surfaces of said trunk portions are placed alongside two axial end surfaces of said tooth such that longitudinal directions of said trunk portions are aligned with a radial direction of said tooth and said first flange portions are oriented radially inward;
a concentrated winding coil that is configured by winding a conductor wire around said tooth for multiple laps so as to pass through a concave space that is formed by said trunk portions and said first and second flange portions of said first and second insulators; and
insulating papers that are disposed between two circumferential side surfaces of said tooth and said concentrated winding coil,
wherein:
a crossover point of said conductor wire is formed on a coil end of said concentrated winding coil that is positioned above said first insulator;
slot-housed portions of said concentrated winding coil that are positioned on two circumferential sides of said tooth are configured such that said conductor wire is arranged in a staggered stacking pattern in multiple rows and in multiple layers; and
a varnish is applied to said coil end that is positioned above said first insulator.

2. The stator for a rotary electric machine according to claim 1 , further comprising a connecting board that is disposed at an end near said first insulators of said plurality of core segments that are arranged into said annular shape,
said connecting board comprising:
a holder that is formed by an insulating member into a ring shape that covers said concentrated winding coils;
a busbar that is mounted to said holder, and that connects said concentrated winding coils; and
a peripheral wall that is formed so as to have a cylindrical shape that protrudes axially from an inner circumferential edge of said holder, and that is positioned on an inner circumferential side of said first insulators so as to cover said first insulators.

3. The stator for a rotary electric machine according to claim 1 , wherein a varnish groove is formed on an inner peripheral surface of said second flange portion and an upper surface of said trunk portion so as to extend from axially outside to a lower portion of an innermost layer of said coil end to which said varnish is applied.

4. The stator for a rotary electric machine according to claim 3 , further comprising a connecting board that is disposed at an end near said first insulators of said plurality of core segments that are arranged into said annular shape,
said connecting board comprising:
a holder that is formed by an insulating member into a ring shape that covers said concentrated winding coils;
a busbar that is mounted to said holder, and that connects said concentrated winding coils; and
a peripheral wall that is formed so as to have a cylindrical shape that protrudes axially from an inner circumferential edge of said holder, and that is positioned on an inner circumferential side of said first insulators so as to cover said first insulators.

5. The stator for a rotary electric machine according to claim 1 , wherein:
a crossover point of said conductor wire is formed on a coil end of said concentrated winding coil that is positioned above said second insulator; and
said varnish is applied to said coil end that is positioned above said second insulator.

6. The stator for a rotary electric machine according to claim 5 , further comprising a connecting board that is disposed at an end near said first insulators of said plurality of core segments that are arranged into said annular shape,
said connecting board comprising:
a holder that is formed by an insulating member into a ring shape that covers said concentrated winding coils;
a busbar that is mounted to said holder, and that connects said concentrated winding coils; and
a peripheral wall that is formed so as to have a cylindrical shape that protrudes axially from an inner circumferential edge of said holder, and that is positioned on an inner circumferential side of said first insulators so as to cover said first insulators.

7. The stator for a rotary electric machine according to claim 5 , wherein a varnish groove is formed on an inner peripheral surface of said second flange portion and an upper surface of said trunk portion so as to extend from axially outside to a lower portion of an innermost layer of said coil end to which said varnish is applied.

8. The stator for a rotary electric machine according to claim 7 , further comprising a connecting board that is disposed at an end near said first insulators of said plurality of core segments that are arranged into said annular shape,
said connecting board comprising:
a holder that is formed by an insulating member into a ring shape that covers said concentrated winding coils;
a busbar that is mounted to said holder, and that connects said concentrated winding coils; and
a peripheral wall that is formed so as to have a cylindrical shape that protrudes axially from an inner circumferential edge of said holder, and that is positioned on an inner circumferential side of said first insulators so as to cover said first insulators.

Assignees

• Mitsubishi Electric Corp

Inventors

• Yoshida Shinichiro
• Yasui Michiya
• Sugai Toshiyuki
• Tamura Shuichi
• Yamamoto Yuki
• Inoue Masaya
• Yamamura Akihiro

Classifications

• H02K3/18 Primary

  Windings for salient poles · CPC title

• H02K3/28 Primary

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title

• H02K5/08

  Insulating casings · CPC title

• H02K2203/12

  Machines characterised by the bobbins for supporting the windings · CPC title

• H02K3/522

  for generally annular cores with salient poles · CPC title