US4132934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor driven vehicles
Assignee: Cableform Ltd
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Filing: 1976-10-28
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Granted: 1979-01-02
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Expires: 1996-10-28
Abstract
Abstract A control arrangement is described for dynamically braking a vehicle driven by an electric motor having a single field winding. The control arrangement comprises means for controlling the supply of power to the motor, a permanent magnet generator for mechanically coupling to the motor, and circuit closure means arranged to complete a circuit between the output of the generator and the field winding to dynamically brake the motor when the motor is de-energized by the controlling means.
Inventors
- 👤 John Morton
- 👤 Keith D. Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:44
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; H02P7/2913; B; B60; B60L; B60L15/00; B60L15/20; B60L15/2009; B60L7/00; B60L7/10; B60L7/12; H02P3/00; H02P3/06; H02P3/08; H02P3/12; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/72
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
A dynamic braking control arrangement for a vehicle driven by an electric motor having a single field winding, comprising: means for controlling the supply of power to the motor, a permanent magnet generator mechanically coupled to the motor, and continuously operable circuit closure means for automatically connecting the output of the generator to said single field winding to dynamically brake the motor when the motor is de-energised by the controlling means, said generator output constituting the sole and entire source of electrical energy supplied to said single field winding during dynamic braking.
Claim 2
Dependent Claim
92 words
A dynamic braking control arrangement for a vehicle driven by an electric motor having a single field winding, comprising: means for controlling the supply of power to the motor, a permanent magnet generator mechanically coupled to the motor, and continuously operable circuit closure means for automatically connecting the output of the generator to said single field winding to dynamically brake the motor when the motor is de-energised by the controlling means, said generator output constituting the sole and entire source of electrical energy supplied to said single field winding during dynamic braking.
Claim 3
Dependent Claim
51 words
A control arrangement according to claim 1, wherein said circuit closure means comprises means for sensing the output of the generator and for completing a circuit between the output of the generator and said single motor field winding to apply dynamic braking when the sensed output signal reaches a predetermined value.
Claim 4
Dependent Claim
53 words
A control arrangement according to claim 2, wherein said means for sensing comprises a relay connected across the generator, and said means for completing a circuit comprises contacts controlled by the relay closing to apply the output of the generator to said single field winding when the generator output reaches a predetermined level.
Claim 5
Dependent Claim
46 words
A control arrangement according to claim 1, comprising a relay arranged to be energised whenever the motor and power supply controlling means is connected to a power supply, which relay when de-energised closes contacts to apply the output of the generator to said single field winding.
Claim 6
Dependent Claim
48 words
A control arrangement according to claim 3, comprising a further relay arranged to be energised whenever the motor and power supply controlling means is connected to a power supply, which further relay when de-energised closes contacts to apply the output of the generator to said single field winding.
References Cited (Backward Citations)
US2627597A
Cited
US3569811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |