Rotating Electrical Machine

• US 20090184591A1
• Filed: 12/12/2008
• Published: 07/23/2009
• Est. Priority Date: 12/14/2007
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd.
• Inventors: UEDA, Toshiaki, KAJIYA, Nobuyuki, HOSHINO, Katsuhiro, KOIZUMI, Takayuki, NAKAYAMA, Kenichi
• Granted Patent: US 8,203,240 B2
• Time in Patent Office: Days
• US Class Current: 310/54
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 1/02 to electric heating circuits
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2220/14 Synchronous machines
• CPC Class Codes: B60L 2220/50 Structural details of electrical machines
• CPC Class Codes: B60L 2240/36 Temperature of vehicle components or parts
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/425 Temperature
• CPC Class Codes: B60L 2240/429 Current
• CPC Class Codes: B60L 2260/28 Four wheel or all wheel drive
• CPC Class Codes: B60L 3/0061 relating to electrical machines
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 7/14 for vehicles propelled by ac motors
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 3/522 for generally annular cores with salient poles
• CPC Class Codes: H02K 9/19 for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A rotating electrical machine includes: a stator that including a stator core and a teeth section, with a stator coil wound at the teeth section; a rotor arranged via a clearance at an inner periphery side of the stator and supported in a freely rotating manner; and a distribution unit supported by a resin holder, and including a conductor connected to the stator coil. The rotating electrical machine is cooled by coolant. The stator coil includes a coil end section projecting from an end of the stator in an axial direction. A gap is formed between an end of the stator core and a lower surface of the distribution unit by mounting the distribution unit on an upper part of the coil end section. The gap constitutes a path for the coolant.

Claims

1. A rotating electrical machine, comprising:

a stator that comprises a stator core and a teeth section, with a stator coil wound at the teeth section;

a rotor arranged via a clearance at an inner periphery side of the stator and supported in a freely rotating manner; and

a distribution unit supported by a resin holder, and comprising a conductor connected to the stator coil, wherein;

the rotating electrical machine is cooled by coolant;

the stator coil comprises a coil end section projecting from an end of the stator in an axial direction;

a gap is formed between an end of the stator core and a lower surface of the distribution unit by mounting the distribution unit on an upper part of the coil end section, and

the gap constitutes a path for the coolant.

2. A rotating electrical machine according to claim 1, further comprising:

a bobbin, arranged between the teeth section and the stator core of the stator, that provides insulation between the teeth section and the stator coil and supports the stator coil; and

a hole, provided at least one of a flange section on an outer diameter side of the bobbin and a flange section on an inner diameter side of the bobbin, that enables the coolant to make contact with an outer periphery of the stator coil.

3. A rotating electrical machine according to claim 2, wherein:

the hole is provided at both the flange section on the outer diameter side of the bobbin and the flange section on the inner diameter side of the bobbin; and

a groove is provided at a position on a body of the bobbin facing an inner periphery side of the coil end section so as to enable the coolant to make contact with the inner periphery side of the coil end section of the stator coil.