US5747900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor with an air-cooling system
Assignee: Fanuc Corp
•
Filing: 1995-10-13
•
Granted: 1998-05-05
•
Expires: 2015-10-13
Abstract
Abstract An electric motor includes a covering member for covering the outer periphery of a stator core, to improve the cooling efficiency of an air-cooling system of the motor. The covering member is fixed to a stator while defining a cavity therebetween in fluidic communication with air passages formed directly in the stator core. When an blower unit mounted on the motor operates, an ambient air surrounding the motor is introduced into the cavity, and then flows from the cavity into the air passages, so as to actively absorb heat generated in the stator from the outer peripheral surface of the stator core and the tubular wall surfaces of the air passages. Thereafter, the air is discharged from the air passages out of the motor.
Inventors
- 👤 Kosei Nakamura
- 👤 Yukio Katsuzawa
- 👤 Junichi Nagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:26
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/14; H02K9/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
An electric motor with an air-cooling system, comprising: a rotor; a stator having a stator core encircling said rotor with a gap being defined therebetween; a plurality of air passages formed directly in said stator core and extending generally axially along an outer periphery of the stator core; a covering member fixed to said stator and at least partially covering an outer peripheral surface of said stator core so as to define a cavity at least partially encircling said stator core in fluidic communication with said air passages; and a blower unit disposed at one end of the motor to allow for blowing ambient air, surrounding said motor, into said cavity, whereby the air flows from said cavity into said air passages to absorb heat generated in said stator and then is discharged from said air passages out of the motor.
Claim 2
Dependent Claim
141 words
An electric motor with an air-cooling system, comprising: a rotor; a stator having a stator core encircling said rotor with a gap being defined therebetween; a plurality of air passages formed directly in said stator core and extending generally axially along an outer periphery of the stator core; a covering member fixed to said stator and at least partially covering an outer peripheral surface of said stator core so as to define a cavity at least partially encircling said stator core in fluidic communication with said air passages; and a blower unit disposed at one end of the motor to allow for blowing ambient air, surrounding said motor, into said cavity, whereby the air flows from said cavity into said air passages to absorb heat generated in said stator and then is discharged from said air passages out of the motor.
Claim 3
Dependent Claim
96 words
An electric motor as set forth in claim 1, wherein said cavity defined between said stator core and said covering member opens to an exterior of said motor at only a position adjacent to a rear axial end of said stator core and is communicated with said air passage at a position adjacent to a front axial end of said stator core, whereby the air flows from a rear axial end of said cavity to a front axial end of said air passages and then is discharged from a rear axial end of said air passages.
Claim 4
Dependent Claim
22 words
An electric motor as set forth in claim 1, wherein an elastic element is interposed between said stator and said covering member.
Claim 5
Dependent Claim
65 words
An electric motor as set forth in claim 1, wherein said stator includes a pair of supporting members arranged at respective axial ends of said stator core, said supporting members being provided with axially extending through holes in fluidic communication with respective said air passages, so that said cavity is communicated with said air passages through said through holes of one of said supporting members.
Claim 6
Dependent Claim
30 words
An electric motor as set forth in claim 1, wherein said blower unit is disposed at a lateral side of said motor and is fixedly carried by said covering member.
References Cited (Backward Citations)
US4406959A
Cited
US4680493A
Cited
US4866320A
Cited
US5019737A
Cited
US4908538A
Cited
US5559380A
Cited
US5397950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-04 | 2001-11-03 | 2002-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-04 | 2005-11-03 | 2006-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-04 | 2009-11-03 | 2010-05-05 | $7700.00 | Window Closed / Lapsed |