US3792326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chopper-controlled scheme for infinite field weakening of series motors
Assignee: CKD Praha DIZ AS
•
Filing: 1971-03-30
•
Granted: 1974-02-12
•
Expires: 1991-03-30
Abstract
Abstract Circuit arrangement for starting and controlling the running of series connected motors comprising a chopper circuit, and a blocking diode arranged serially with the motor and a source of current. The blocking diode is connected to one pole of the field winding and arranged conductively for running current. A resistor shunts the diode.
Inventors
- 👤 A First
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:18
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/298; H02P7/285; H02P7/29; B; B60; B60L; B60L2200/00; B60L2200/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
An arrangement for starting and controlling the speed of a motor having its armature and field windings serially connected to a source of current comprising means for causing intermittent conduction of current and means for unidirectionally blocking the flow of current both of said means being serially arranged with the source of current and the motor, said blocking meAns having one pole connected to said field winding and arranged conductively for running current; and a resistor connected in parallel between said field winding and said blocking means to shunt said blocking means.
Claim 2
Dependent Claim
92 words
An arrangement for starting and controlling the speed of a motor having its armature and field windings serially connected to a source of current comprising means for causing intermittent conduction of current and means for unidirectionally blocking the flow of current both of said means being serially arranged with the source of current and the motor, said blocking meAns having one pole connected to said field winding and arranged conductively for running current; and a resistor connected in parallel between said field winding and said blocking means to shunt said blocking means.
Claim 3
Dependent Claim
14 words
The arrangement according to claim 1 including means for varying the interval of conduction.
Claim 4
Dependent Claim
19 words
The arrangement according to claim 2 wherein the means for causing intermittent conduction comprises a semi conductor rectifier circuit.
Claim 5
Dependent Claim
17 words
The arrangement according to claim 3 wherein the semi conductor rectifier circuit comprises a thyristor chopper circuit.
Claim 6
Dependent Claim
26 words
The arrangement according to claim 1 wherein said unidirectional blocking means comprises a diode arranged between said field winding and said means for causing intermittent conduction.
Claim 7
Dependent Claim
27 words
The arrangement according to claim 1 wherein said unidirectional blocking means comprises a diode arranged between said field winding and one terminal of said souce of current.
Claim 8
Dependent Claim
20 words
The arrangement according to claim 5 wherein one pole of said armature is connected to one terminal of said source.
Claim 9
Dependent Claim
20 words
The arrangement according to claim 6 wherein one pole of said armature is connected to said means for intermittent conduction.
Claim 10
Dependent Claim
23 words
The arrangement according to claim 1 including a second diode arranged in parallel with said field winding and armature to shunt said armature.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |