US3633082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for driving, stopping and restarting a variable speed single-phase induction motor
Assignee: Panasonic Holdings Corp
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Filing: 1970-09-24
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Granted: 1972-01-04
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Expires: 1990-09-24
Abstract
Abstract A control circuit for driving, stopping and restarting a variable speed single-phase induction motor, in which when said motor is stopped from a running state by a DC braking means, the full voltage of the AC power source available for restarting the motor only for a predetermined time interval after it is stopped, regardless of the state of the running speed just before the stoppage. Three switches are provided for selectively connecting the AC power source, a DC power source for braking the motor, whereby the full starting torque is available to restart the motor in any state of the speed setting of the motor.
Inventors
- 👤 Hidenobu Hasegawa
- 👤 Zenji Kusuda
- 👤 Akira Tanaka
- 👤 Jinichiro Neritani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:16
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/42; H02P1/44; H02P23/00; H02P23/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
234 words
A control circuit for driving, stopping and restarting a variable speed single-phase induction motor having a field means including a primary winding and a secondary winding having a plurality of taps adapted for variable speed operation, said field means being adapted to be energized by DC power for producing a braking effort to stop the motor rotation, an AC power source, a rectifier means for producing said DC power, a tap changer means for selecting a desired one of said taps, said control circuit comprising: a first switch means movable between first and second positions, a second switch means movable between third and fourth positions, said tap-changer means being connected to said AC source through the third position of said second switch means and the first position of said first switch means, said first switch means being interlinked with said second switch means so as to be moved between said first and second positions with a predetermined time interval as said second switch means is moved between said third and fourth positions, respectively, a third switch means movable between fifth and sixth positions as said second switch means is moved to said third and fourth positions respectively, said field means being connected to said AC source at said fifth position through said second position of said first switch means and being connected directly to the output of said rectifier means at said sixth position.
Claim 2
Dependent Claim
234 words
A control circuit for driving, stopping and restarting a variable speed single-phase induction motor having a field means including a primary winding and a secondary winding having a plurality of taps adapted for variable speed operation, said field means being adapted to be energized by DC power for producing a braking effort to stop the motor rotation, an AC power source, a rectifier means for producing said DC power, a tap changer means for selecting a desired one of said taps, said control circuit comprising: a first switch means movable between first and second positions, a second switch means movable between third and fourth positions, said tap-changer means being connected to said AC source through the third position of said second switch means and the first position of said first switch means, said first switch means being interlinked with said second switch means so as to be moved between said first and second positions with a predetermined time interval as said second switch means is moved between said third and fourth positions, respectively, a third switch means movable between fifth and sixth positions as said second switch means is moved to said third and fourth positions respectively, said field means being connected to said AC source at said fifth position through said second position of said first switch means and being connected directly to the output of said rectifier means at said sixth position.
Claim 3
Dependent Claim
69 words
A control circuit according to claim 1, further comprising: a switch control circuit comprising first and second relay means, said first relay means adapted to be energized so as to operate said second and third switch means, said second relay means being interlinked with said first relay means so as to operate said first switch means with said predetermined time interval after the operation of said first relay means.
Claim 4
Dependent Claim
58 words
A control circuit according to claim 2, said switch control circuit further comprising a monostable multivibrator for energizing said first relay means responsive to a breaking command, and a switching circuit for energizing said second relay means, said switching circuit being operated by said multivibrator with said predetermined time interval after the energization of said first relay means.
Claim 5
Dependent Claim
60 words
A control circuit according to claim 3, said monostable multivibrator including two transistors, said first relay means including at least one relay coil connected to a collector circuit of one of said two transistors, said switching circuit including a switch transistor being operated by said multivibrator, said second relay means being connected to a collector circuit of said switch transistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |