Electric rotating machine having a thermistor in a gap between U-shaped and odd-shaped coil ends

Patent metadata

Field	Value
Publication number	US-9735659-B2
Application number	US-201314439109-A
Country	US
Kind code	B2
Filing date	Oct 9, 2013
Priority date	Oct 29, 2012
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

An electric rotating machine includes a rotor, a stator, and a thermistor. The thermistor has a temperature measuring element portion that is fitted in a minute gap defined by connecting portions of segment conductors at a stator coil end. The stator coil end is formed by arranging a plurality of the segment conductors in slots of a stator core to thereby form connecting portions of the segment conductors at the end portion of the stator core. The thermistor is separated from the connecting portions of the segment conductors only by dead air that defines the minute gap.

First claim

The invention claimed is:

1. An electric rotating machine comprising: a rotor mounted on a rotating shaft rotatably supported; and a stator disposed around an outer circumference of the rotor via a minute clearance between the rotor and the stator; the stator including a stator core having a plurality of slots formed in a circumferential direction, a stator winding formed by connecting a plurality of segment conductors inserted into the slots of the stator core, and a thermistor for measuring the temperature of the stator winding, and the stator winding including slot portions received in the slots, and connecting portions each of which connects end portions of the slot portions, wherein a temperature measuring element portion of the thermistor is fitted in a minute gap defined by the connecting portions of the segment conductors at a stator coil end, the stator coil end being formed by arranging a plurality of the segment conductors in the slots of the stator core to thereby form the connecting portions of the segment conductors at the end portion of the stator core, and
the thermistor is separated from the connecting portions of the segment conductors only by dead air that defines the minute gap,
wherein the minute gap is defined by at least four connecting portions of the segment conductors that immediately surround the temperature measuring element portion of the thermistor.

2. The electric rotating machine according to claim 1 ,
wherein the segment conductors includes:
a U-shaped segment conductor having a general U-shape which has slot portions received in two separate slots of the stator core and has connecting portions each of which connects end portions of the slot portions; and
an odd-shaped segment conductor which has a slot portion received in one of the slots and a connecting portion for connecting an end portion of the slot portion to a U-, V-, or W- lead terminal, a neutral point or a transition portion, the odd-shaped segment conductor being different in shape from the U-shaped segment conductor, and
wherein a plurality of the U-shaped segment conductors and of odd-shaped segment conductors are arranged in the slots of the stator core so that the connecting portions of the U-shaped segment conductors and the connecting portions of the odd-shaped segment conductors are arranged in the end portion of the stator core to form the stator coil end, and
the temperature measuring element portion of the thermistor is inserted into the stator coil end from an opening defined among the U-shaped segment conductors and the odd-shaped segment conductor adjacent thereto and is fitted into a minute gap defined among the connecting portions of the U-shaped segment conductors and the connecting portion of the odd-shaped segment conductor in the stator coil end.

3. The electric rotating machine according to claim 1 ,
wherein the segment conductors includes:
a U-shaped segment conductor having a general U-shape which has slot portions received in two separate slots of the stator core and has connecting portions each of which connects end portions of the slot portions; and
an odd- and U-shaped segment conductor which has slot portions received in the two separate slots of the stator core and odd-shaped connecting portions each connecting end portions of the slot portions, the odd-shaped connecting portions being shaped convex and being different in shape from the connecting portions of the U-shaped segment conductor, and
wherein a plurality of the U-shaped segment conductors and of the odd- and U-shaped segment conductors are arranged in the slots of the stator core so that the connecting portions of the U-shaped segment conductors and the odd-shaped connecting portions of the odd- and U-shaped segment conductors are arranged in the end portion of the stator core to form the stator coil end, and
wherein the temperature measuring element portion of the thermistor is inserted into the stator coil end from an opening defined among the U-shaped segment conductors and the odd- and U-shaped segment conductor adjacent thereto and is fitted into a minute gap defined among the connecting portions of the U-shaped segment conductors and the connecting portion of the odd- and U-shaped segment conductor or a minute gap defined among the odd-shaped connecting portions in the stator coil end.

4. The electric rotating machine according to claim 2 ,
wherein the temperature measuring element portion of the thermistor is secured by means of varnish in the minute gap sandwiched among the connecting portions of the segment conductors.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Koizumi Takayuki
• Oda Keiji
• Koyama Shinichi

Classifications

• H02K3/12

  arranged in slots · CPC title

• H02K3/48

  in slots · CPC title

• H02K11/25 Primary

  Devices for sensing temperature, or actuated thereby · CPC title

• H02K3/50

  Fastening of winding heads, equalising connectors, or connections thereto · CPC title

• H02K3/00

  Details of windings · CPC title