US4045698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Small air gap motor
Assignee: Morrill Motors Inc
•
Filing: 1976-05-03
•
Granted: 1977-08-30
•
Expires: 1996-05-03
Abstract
Abstract An electric motor having a rotor member and a stator member which define an air gap from about 0.001 inch to about 0.006 inch in width, the ratio of air gap width to rotor diameter being from about 0.0009 to about 0.005.
Inventors
- 👤 Wayne J. Morrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:11
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/16; H02K5/167; H02K5/1675; H02K17/00; H02K17/02; H02K17/04; H02K17/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
In an electric motor having a stator core member with inwardly extending polar projections having inner ends defining a bore, and a rotor member rotatably mounted in said bore and having a peripheral surface defining radial air gaps with said inner ends, the improvement wherein said air gaps respectively have a radial width of from greater than about 0.001 inch to less than about 0.006 inch taken between said peripheral surface and said inner ends, the ratio of air gap width to rotor diameter being from greater than about 0.0009 to less than about 0.005.
Claim 2
Dependent Claim
95 words
In an electric motor having a stator core member with inwardly extending polar projections having inner ends defining a bore, and a rotor member rotatably mounted in said bore and having a peripheral surface defining radial air gaps with said inner ends, the improvement wherein said air gaps respectively have a radial width of from greater than about 0.001 inch to less than about 0.006 inch taken between said peripheral surface and said inner ends, the ratio of air gap width to rotor diameter being from greater than about 0.0009 to less than about 0.005.
Claim 3
Dependent Claim
16 words
The motor of claim 1 wherein said motor is a unit bearing, fractional horse power motor.
Claim 4
Dependent Claim
29 words
The motor of claim 2 wherein said air gaps, respectively, have a radial width of about 0.002 to 0.004 inch, said ratio being from about 0.0018 to about 0.0035.
Claim 5
Dependent Claim
12 words
The motor of claim 3 wherein said bearing is a sleeve bearing.
Claim 6
Dependent Claim
26 words
The motor of claim 4 wherein said polar projections are salient poles each having a pole face defining a respective air gap with said rotor member.
Claim 7
Dependent Claim
20 words
The motor of claim 5 wherein said motor is an alternating current induction motor having a squirrel cage rotor member.
Claim 8
Dependent Claim
15 words
The motor of claim 6 wherein said motor is a single phase, shaded pole motor.
References Cited (Backward Citations)
US1884140A
Cited
US2993131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |