US3581175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control circuit with two voltage sources to enable precise speed control over a large speed range
Assignee: Honeywell GmbH
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Filing: 1969-12-04
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Granted: 1971-05-25
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Expires: 1989-12-04
Abstract
Abstract There is disclosed a control system for controlling the speed of the direct current electric motor over a wide range of speeds, for example, a speed range ratio of 1600:1. The speed of the motor is directly controlled by controlling the firing angle of a thyristor bridge network. In order to accomplish a high order accuracy over the very wide range, a voltage of a first magnitude is applied to the thyristor bridge network over a first portion of a range and a voltage of a second magnitude is applied to the thyristor bridge for a second portion of the range.
Inventors
- 👤 Manfred Merz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:10
CPC Classifications
H; H02; H02P; 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
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
180 words
A speed control system for a direct current motor, said system comprising a feedback circuit for maintaining the motor speed at substantially the required speed, means for producing a pulsed output signal for driving the motor, the pulses of said pulsed output signal having a duration controlled by an input control signal, selectively operable means for adjusting the magnitude of said input control signal whereby to control the pulse duration of said pulses and thereby to effect a control of the speed of operation of said motor, switching means coordinated with the operation of said selectively operable means, means responsive to said switching means for selectively controlling the amplitude of said pulses to a first amplitude during a first portion of the range of speed change of said motor and to a second amplitude during a second portion of said range, and means also responsive to said switching means for controlling the magnitude of the signal in said feedback circuit to a first and second value range, respectively, during said first and second portions of said range of speed change.
Claim 2
Dependent Claim
180 words
A speed control system for a direct current motor, said system comprising a feedback circuit for maintaining the motor speed at substantially the required speed, means for producing a pulsed output signal for driving the motor, the pulses of said pulsed output signal having a duration controlled by an input control signal, selectively operable means for adjusting the magnitude of said input control signal whereby to control the pulse duration of said pulses and thereby to effect a control of the speed of operation of said motor, switching means coordinated with the operation of said selectively operable means, means responsive to said switching means for selectively controlling the amplitude of said pulses to a first amplitude during a first portion of the range of speed change of said motor and to a second amplitude during a second portion of said range, and means also responsive to said switching means for controlling the magnitude of the signal in said feedback circuit to a first and second value range, respectively, during said first and second portions of said range of speed change.
Claim 3
Dependent Claim
103 words
The invention as set forth in claim 1 wherein said feedback circuit includes a tachogenerator coupled to be driven by said motor, a resistance means, and a signal comparator, the output signal from said tachogenerator being connected through said resistance means to the one input of said comparator signal, said input control signal being connected to the other input of said comparator, the output of said comparator being applied to control said pulse duration, said resistance means comprising a first and a second resistor of different values, said first or second resistors being selectively connected in said feedback circuit by said switching means.
Claim 4
Dependent Claim
58 words
The invention as set forth in claim 3 wherein said means responsive to said switching means for controlling the amplitude of said pulses includes a first and a second alternating current power source of substantially different voltages, said first and second power sources being selectively connected by said switching means to said means for producing pulsed output signals.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |