Stator structure for rotary electric machine

• US 20030057797A1
• Filed: 08/05/2002
• Published: 03/27/2003
• Est. Priority Date: 09/26/2001
• 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 6,809,442 B2
• Time in Patent Office: Days
• US Class Current: 310/217
• CPC Class Codes: H02K 1/146 consisting of a generally annular yoke with salient poles
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 3/487 Slot-closing devices
• CPC Class Codes: H02K 5/128 using air-gap sleeves or air-gap discs
• CPC Class Codes: H02K 9/00 Arrangements for cooling or ventilating channels or ducts in parts of the magnetic circuit H02K1/20, H02K1/32; channels or ducts in or between conductors H02K3/22, H02K3/24
• 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 stator for a rotary electric machine is provided to curb decreases in output caused by magnetic flux leakage. The stator has a stator core with stator coils that are wound around tooth parts of the stator core. The tooth parts of the stator core are arranged to form a rotational space with respect to a rotor, and housed inside the slots and cooling medium passages are formed inside the slots by blocking the openings of the slots. The protrusions are provided that protrude into the slots from both lateral surfaces of the tips of the tooth parts. The plates formed with grooves on both sides thereof that fit on the tips of the protrusions are arranged between adjacent ones of the protrusions so as to block the openings of the slots. A sealing member is formed on the rotor side of the plates.

Claims

1. A rotary electric machine comprising:

a machine housing having an interior area with a coolant inlet port and a coolant outlet port;

a rotor rotatably coupled within the interior area of the machine housing; and

a stator fixedly coupled within the interior area of the machine housing and disposed around the rotor, the stator comprising

a stator core including a plurality of circumferentially spaced tooth parts forming a plurality of slots between adjacent pairs of the tooth parts, the tooth parts having tips that define openings of the slots,

a plurality of protrusions protruding from both lateral surfaces of the tips of the tooth parts into the slots,

a plurality of coils wound onto the tooth parts of the stator core and extending through the slots,

a plurality of plates having recesses on circumferential sides with the protrusions of the adjacent pairs of the tooth parts being located in the recesses of the plates to block the openings of the slots; and

a seal formed between rotor facing sides of the plates and the tooth parts.

2. The rotary electric machine as recited in claim 1, wherein

each of the protrusions includes a rotor facing surface that slants away from the rotor as the rotor facing surface extends toward corresponding one of the slots.

3. The rotary electric machine as recited in claim 1, wherein

each of the plates includes an extended leg part that is arranged to extend outwardly in a radial direction to be circumferentially located between adjacent pairs of the coils in a non-contacting manner.

4. The rotary electric machine as recited in claim 1, wherein

each of the plates includes a rotor facing surface configured to be substantially concentric with an outer extending surface of the rotor.

5. The rotary electric machine as recited in claim 1, wherein

each of the plates includes a groove formed in a rotor facing surface with a portion of the seal being disposed therein.

6. The rotary electric machine as recited in claim 1, wherein

each of the protrusions includes a rotor facing surface having an axially extending groove, said grooves of said rotor facing surfaces being arranged to be substantially aligned in a circumferential direction and having circumferentially-facing tips of the plates disposed into the grooves.

7. A rotary electric machine comprising:

a machine housing having an interior area with a coolant inlet port and a coolant outlet port;

a rotor rotatably coupled within the interior area of the machine housing; and

a stator fixedly coupled within the interior area of the machine housing and disposed around the rotor, the stator comprising

a stator core including a plurality of circumferentially spaced tooth parts forming a plurality of slots between adjacent pairs of the tooth parts, the tooth parts having tips that define openings of the slots,

a plurality of protrusions protruding from both lateral surfaces of the tips of the tooth parts into the slots,

a plurality of coils wound onto the tooth parts of the stator core and extending through the slots,

a plurality of plates arranged between adjacent pairs of the protrusions of the adjacent pairs of the tooth parts to block the openings of the slots, each of the plates comprising a main body contacting a rotor facing surface of the protrusions, a leg part arranged between adjacent pairs of the coils and formed with a width as not to contact the coils, and a holding part retained in a groove formed in the back core part; and

a seal formed between rotor facing sides of the plates and the tooth parts.

8. The rotary electric machine as recited in claim 7, wherein

each of the plates includes a rotor facing surface configured to be substantially concentric with an outer extending surface of the rotor.

9. The rotary electric machine as recited in claim 7, wherein

each of the plates includes a groove formed in a rotor facing surface with a portion of the seal being disposed therein.

10. The rotary electric machine as recited in claim 7, wherein

each of the protrusions includes a rotor facing surface having an axially extending groove, said grooves of said rotor facing surfaces being arranged to be substantially aligned in a circumferential direction and having circumferentially-facing tips of the plates disposed into the grooves.

11. A stator structure for a rotary electric machine comprising:

a stator core including a plurality of circumferentially spaced tooth parts forming a plurality of slots between adjacent pairs of the tooth parts, the tooth parts having tips that define openings of the slots;

a plurality of protrusions protruding from both lateral surfaces of the tips of the tooth parts into the slots;

a plurality of coils wound onto the tooth parts of the stator core and extending through the slots;

a plurality of plates having recesses on circumferential sides with the protrusions of the adjacent pairs of the tooth parts being located in the recesses of the plates to block the openings of the slots; and

a seal formed between rotor facing sides of the plates and the tooth parts.

12. The stator structure as recited in claim 11, wherein

each of the protrusions includes a rotor facing surface that slants away from the rotor as the rotor facing surface extends toward corresponding one of the slots.

13. The stator structure as recited in claim 11, wherein

each of the plates includes an extended leg part that is arranged to extend outwardly in a radial direction to be circumferentially located between adjacent pairs of the coils in a non-contacting manner.

14. The stator structure as recited in claim 11, wherein

each of the plates includes a rotor facing surface configured to be substantially concentric with an outer extending surface of the rotor.

15. The stator structure as recited in claim 11, wherein

each of the plates includes a groove formed in a rotor facing surface with a portion of the seal being disposed therein.

16. The stator structure as recited in claim 11, wherein

each of the protrusions includes a rotor facing surface having an axially extending groove, said grooves of said rotor facing surfaces being arranged to be substantially aligned in a circumferential direction and having circumferentially-facing tips of the plates disposed into the grooves.