Electric Rotating Machine

• US 20150022050A1
• Filed: 02/01/2013
• Published: 01/22/2015
• Est. Priority Date: 03/09/2012
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: Sawada, Itsuro, Hamano, Hiroshi, Ikeda, Taisuke, Saito, Yasuyuki, Kano, Yuji
• Granted Patent: US 9,300,179 B2
• Time in Patent Office: Days
• US Class Current: 310/215
• CPC Class Codes: H02K 3/30 Windings characterised by the insulating material
• CPC Class Codes: H02K 3/34 between conductors or between conductor and core, e.g. slot insulation
• CPC Class Codes: H02K 3/522 for generally annular cores with salient poles

Abstract

An electric rotating machine having high cooling performance is provided. The electric rotating machine is configured to include a rotor rotating around a rotational axis; and a stator disposed to face the circumferential surface of the rotor. The stator includes a stator core having a cylindrical core back and a plurality of teeth radially extending from the core back, and a stator coil wound around the teeth in concentrated winding via an insulation material. A spacer having electric insulation performance is attached between the stator coils each wound around the respective teeth adjacent to each other. The spacer has a coefficient of linear expansion greater than that of the stator core.

Claims

1. An electric rotating machine, comprising:

a rotor rotating around a rotational axis; and

a stator disposed to face a circumferential surface of the rotor,

the stator including a stator core and a stator coil, the stator core having a cylindrical core back and a plurality of teeth radially extending from the core back, the stator coil being wound around the teeth in concentrated winding via an insulation material,

the electric rotating machine further comprising a spacer having electric insulation performance, the spacer being attached between the stator coils each wound around the respective teeth adjacent to each other,

wherein the spacer has a coefficient of linear expansion greater than that of the stator core.

2. The electric rotating machine according to claim 1,

wherein the spacer has a coefficient of linear expansion greater than that of the stator coil.

3. The electric rotating machine according to claim 1,

wherein the spacers are circumferentially connected to each other at an axial end portion of the stator core.

4. The electric rotating machine according to claim 1,

wherein the spacer has a surface facing the stator coil and formed with a groove adapted to allow a side surface of the stator coil to come into close contact therewith.

5. The electric rotating machine according to claim 1,

wherein the spacer has a different circumferential length depending on the rotational-axial position of the stator core.

6. The electric rotating machine according to claim 5,

wherein the circumferential length of the spacer is maximum in the vicinity of a rotational-axial center of the stator core.