Rotating electric machine

• US 20020074871A1
• Filed: 11/07/2001
• Published: 06/20/2002
• Est. Priority Date: 12/14/2000
• Status: Active Grant

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Kikuchi, Toshio, Kaneko, Yutaro, Tsuneyoshi, Takashi, Kitada, Shinichiro
• Granted Patent: US 6,713,927 B2
• Time in Patent Office: Days
• US Class Current: 310/58
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 3/487 Slot-closing devices
• CPC Class Codes: H02K 9/197 in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator

Abstract

A rotating electric machine using an inner section of a slot of a stator as a cooling passage obtains highly effective cooling performance with a small amount of cooling medium. An opening for a slot in a stator is closed by an under plate having a closing member. A regulating plate is disposed which is a member for regulating the cross-sectional area of the passage in substantially a central section of the slot. In this manner, the cross-sectional area of the cooling passage with the plate in the slot is smaller than the cross-sectional area when the regulating plate is not provided by an area corresponding to the cross-sectional area of the regulating plate. This arrangement allows increases in cooling efficiency.

Claims

1. A rotating electric machine having a stator with a slot housing coils, and a closing member for closing the opening of the slot and forming a cooling passage in the slot, the rotating electric machine comprising:

a regulating member for narrowing the cross-sectional area of the cooling passage in the slot.

2. The rotating electric machine as defined in claim 1, wherein the closing member and the regulating member are integrated.

3. The rotating electric machine as defined in claim 2, wherein the regulating member extends from the main section of the closing member into the slot.

4. The rotating electric machine as defined in claim 1, wherein the regulating member is disposed in substantially a central section of the slot.

5. The rotating electric machine as defined in claim 1, wherein the stator is formed by arranging a plurality of divided cores with coils in a cylindrical shape.

6. A rotating electric machine, comprising:

a stator having a stator core and a slot;

coils housed in the slot;

a closing member for closing the opening of the slot and partitioning a cooling passage in the slot;

wherein the coils are provided in a coiling region limited to a position near the bottom of the slot, and the overall region closer to the opening of the slot than the coils is filled by the closing member.

7. The rotating electric machine as defined claim 6, further comprising a stopper projecting from the teeth of the stator core into the inner section of the slot and being positioned on the end of the coiling region near the opening of the slot.

8. The rotating electric machine as defined in claim 6, wherein the closing member comprises a first member and a second member, the first member molded of a resin in the slot opening, and the second member buried after removing a mold member used in the slot to form the first member.

9. The rotating electric machine as defined in claim 6, wherein the stator is formed by arranging a plurality of divided cores with coils in a cylindrical shape.