US3639822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state power controller for dc permanent magnet and shunt field winding motors supplied from an ac source
Assignee: Cutler Hammer Inc
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Filing: 1970-05-11
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Granted: 1972-02-01
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Expires: 1990-05-11
Abstract
Abstract A solid state switching circuit and power controller for permanent magnet and shunt field winding motors used in portable power tools and the like. The power controller employs a bidirectional thyristor triode and trigger diode for varying the current supplied to the motor armature, and a full-wave rectifier bridge to establish unidirectional current flow through the motor armature on opposite half cycles of the AC power supply. A resistor across the AC terminals of the rectifier bridge enhances control action under light loads.
Inventors
- 👤 Harry W Brown
- 👤 Walter L Rutchik
- 👤 Lawrence J Ryczek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:27
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/10; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/919; Y10S388/935; Y10S388/937
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
In a controller for connecting the armature of a DC permanent magnet or shunt-type motor to a source of alternating voltage supply and varying the current supplied thereto, in combination: an actuating lever, switch means responsive to a given amount of initial movement of said actuating lever to connect the controller to a source of alternating voltage supply, current control means including a controllable bidirectional semiconductor device and a control network responsive to additional movement of said actuating lever to control the flow of current through said semiconductor device during opposite half-cycles of connected alternating voltage supply in accordance with the amount of additional movement of said actuating lever, a full wave rectifier bridge connected in circuit with said semiconductor device and with the armature of a permanent magnet motor to insure current flow through such armature always in the same direction during opposite half-cycles of the alternating voltage supply, and a resistor connected across the AC input terminals of said rectifier bridge.
Claim 2
Dependent Claim
163 words
In a controller for connecting the armature of a DC permanent magnet or shunt-type motor to a source of alternating voltage supply and varying the current supplied thereto, in combination: an actuating lever, switch means responsive to a given amount of initial movement of said actuating lever to connect the controller to a source of alternating voltage supply, current control means including a controllable bidirectional semiconductor device and a control network responsive to additional movement of said actuating lever to control the flow of current through said semiconductor device during opposite half-cycles of connected alternating voltage supply in accordance with the amount of additional movement of said actuating lever, a full wave rectifier bridge connected in circuit with said semiconductor device and with the armature of a permanent magnet motor to insure current flow through such armature always in the same direction during opposite half-cycles of the alternating voltage supply, and a resistor connected across the AC input terminals of said rectifier bridge.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |