US3786329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamic brake
Assignee: Kollmorgen Corp
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Filing: 1973-01-31
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Granted: 1974-01-15
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Expires: 1993-01-31
Abstract
Abstract In a full wave rectified control circuit for a D-C motor comprising two banks of silicon controlled rectifiers for forward and reverse operation, there is provided a pulse generation system which applies a firing signal to each of the control SCR''s when the power to the motor is lost. A short circuit is thereby provided for the motor armature through the control circuit and the rotational energy of the motor is rapidly dissipated to effect dynamic braking.
Inventors
- 👤 J Whited
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:24
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
A dynamic brake system for a rotating D-C motor having a back emf built up therein comprising: A. a power supply; B. a control circuit connected to the power supply and to the motor to provide rectified power to the motor; C. a gated rectifying network in the control circuit which is rendered conductive by a firing signal and is connected to provide a closed looped path for the motor back emf when fired; and D. means for generating the firing signal connected to the rectifier network, said means being coupled to be responsive to an interruption of power to the motor such that the rectifying network is rendered conductive in the event of such interruption.
Claim 2
Dependent Claim
116 words
A dynamic brake system for a rotating D-C motor having a back emf built up therein comprising: A. a power supply; B. a control circuit connected to the power supply and to the motor to provide rectified power to the motor; C. a gated rectifying network in the control circuit which is rendered conductive by a firing signal and is connected to provide a closed looped path for the motor back emf when fired; and D. means for generating the firing signal connected to the rectifier network, said means being coupled to be responsive to an interruption of power to the motor such that the rectifying network is rendered conductive in the event of such interruption.
Claim 3
Dependent Claim
120 words
A dynamic brake system for a rotating D-C motor having a back emf built up therein as described in claim 1 wherein the control circuit and rectifying network comprise: A. an isolating power transformer connected to the power supply having first and second output terminals and a center tap; the center tap being connected directly to one side of the motor; B. first and second forward current passing SCR''s connected to the first and second transformer terminal respectively and to the other side of the motor through a smoothing inductance; and C. first and second reverse current passing SCR''s connected to the first and second transformer terminals respectively, and to the other side of the motor through a smoothing inductance.
Claim 4
Dependent Claim
79 words
A dynamic brake system for a rotating D-C motor having a back emf built up therein as described in claim 1 wherein the means for generating the firing signal comprises: A. an oscillating circuit; B. a switching circuit connected to the oscillating circuit being responsive to interruption of power to the motor to turn on the oscillating circuit; and C. an amplifier circuit connected to amplify pulses from the oscillating circuit and to apply them to the rectifying network.
Claim 5
Dependent Claim
154 words
A dynamic brake system for a rotating D-C motor having a back emf built up therein comprising: A. a power supply; B. an isolating transformer connected to the power supply having first and second terminals and a center tap, the center tap being connected directly to one side of the motor; C. first and second forward current passing SCR''s connected to the first and second transformer terminals respectively and to the other side of the motor through a smoothing inductance; D. first and second reverse current passing SCR''s connected to the first and second transformer terminals respectively and to the other motor terminal through a smoothing inductance; E. an oscillating circuit connected to the gates of the SCR''s through an amplifier circuit to apply firing pulses to said gates; and F. a switching circuit connected to the oscillating circuit being responsive to interruption of power to the motor to turn on the oscillating circuit.
Claim 6
Dependent Claim
154 words
A dynamic brake system for a rotating D-C motor having a back emf built up therein comprising: A. a power supply; B. an isolating transformer connected to the power supply having first and second terminals and a center tap, the center tap being connected directly to one side of the motor; C. first and second forward current passing SCR''s connected to the first and second transformer terminals respectively and to the other side of the motor through a smoothing inductance; D. first and second reverse current passing SCR''s connected to the first and second transformer terminals respectively and to the other motor terminal through a smoothing inductance; E. an oscillating circuit connected to the gates of the SCR''s through an amplifier circuit to apply firing pulses to said gates; and F. a switching circuit connected to the oscillating circuit being responsive to interruption of power to the motor to turn on the oscillating circuit.
References Cited (Backward Citations)
US3463991A
Cited
US3501684A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |