US4052650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starting device for a single-phase motor
Assignee: Danfoss AS
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Filing: 1973-11-16
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Granted: 1977-10-04
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Expires: 1993-11-16
Abstract
Abstract The invention relates to a single-phase motor assembly which includes in the circuit means thereof a starting winding in series with a starting resistor having NTC and PTC characteristics. The NTC and PTC characteristics are sequentially related. The NTC characteristic has an ohmic range which extends from a value above to a value below a predetermined critical ohm value at which a current sufficient for starting the motor flow in the starting winding. The PTC characteristic has an ohm range which extends from a value below to a value above the critical ohmic value referred to.
Inventors
- 👤 Asger Gramkow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:55
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A single-phase motor assembly including circuit means, a first branch of said circuit means containing a main winding, a second brance of said circuit means in parallel with said first branch containing winding means for starting and a starting resistor, said resistor having sequential NTC and PTC characteristics, said NTC characteristic having an ohmic range which extends from a first value above to a second value below a predetermined critical ohmic value at which a current sufficient for starting the motor flows in said starting winding means, said first value being on the order of approximately ten times said second value and being at least several times said critical value, said PTC characteristic having an ohmic range which extends from a value below to a value above said critical ohmic value.
Claim 2
Dependent Claim
131 words
A single-phase motor assembly including circuit means, a first branch of said circuit means containing a main winding, a second brance of said circuit means in parallel with said first branch containing winding means for starting and a starting resistor, said resistor having sequential NTC and PTC characteristics, said NTC characteristic having an ohmic range which extends from a first value above to a second value below a predetermined critical ohmic value at which a current sufficient for starting the motor flows in said starting winding means, said first value being on the order of approximately ten times said second value and being at least several times said critical value, said PTC characteristic having an ohmic range which extends from a value below to a value above said critical ohmic value.
Claim 3
Dependent Claim
35 words
A single-phase motor assembly according to claim 1 wherein said NTC range is from about 400 ohms to 25 ohms and said PTC range is from about 25 ohms to about 3000 ohms and above.
Claim 4
Dependent Claim
41 words
A single-phase motor according to claim 1 wherein said NTC range corresponds to an approximate temperature range from 20° C. to 115° C. and said PTC range corresponds to an approximate temperature range from 115° C. to 200° C. and above.
References Cited (Backward Citations)
GB1042126A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |