Patent US1423247A successfully refreshed from Google Patents.
Patent US3826962A successfully refreshed from Google Patents.
US3826962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of electric motors for battery-operated vehicles
Assignee: Cableform Ltd
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Filing: 1973-05-30
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Granted: 1974-07-30
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Expires: 1993-05-30
Abstract
Abstract A control means for a series electric motor for, for example, battery operated vehicle usually includes a DC switch for connecting said motor across a battery, a flywheel diode for connecting across the motor and a reverse diode for conducting armature current resulting from regeneration. To avoid overheating when regeneration braking is used on long gradients a resistor is provided in the armature reverse-diode loop in combination with a contactor having a current coil sensitive only to reverse diode current and having normally closed contacts shorting the resistor.
Inventors
- 👤 G Thexton
- 👤 J Morton
- 👤 K Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:13
CPC Classifications
B; B60; B60L; B60L7/00; B60L7/003; H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/12; B60L2200/00; B60L2200/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
A control means for a series electric motor comprising a DC switch connecting said motor across a battery, a flywheel diode across the motor and a reverse diode across the armature for conducting armature current resulting from regeneration, a resistor provided in the armature reverse-diode loop in combination with a contactor having a current coil sensitive only to reverse diode current and having normally closed contacts shorting the resistor.
Claim 2
Dependent Claim
69 words
A control means for a series electric motor comprising a DC switch connecting said motor across a battery, a flywheel diode across the motor and a reverse diode across the armature for conducting armature current resulting from regeneration, a resistor provided in the armature reverse-diode loop in combination with a contactor having a current coil sensitive only to reverse diode current and having normally closed contacts shorting the resistor.
Claim 3
Dependent Claim
51 words
A control means as clAimed in claim 1, wherein the resistor is connected in the series connection of the motor between the armature and the field and the current coil of the contactor is connected in series with the reverse diode across the series connection of the resistor and the armature.
Claim 4
Dependent Claim
31 words
A control means as claimed in claim 1, wherein the resistor, the current coil of the contactor and the reverse diode are connected in series across the armature of the motor.
Claim 5
Dependent Claim
40 words
A control means as claimed in claim 1, wherein the D.C. switch provides pulses of current to the motor and means are provided to limit the range of pulse rate applied to the motor during conduction of the reverse diode.
Claim 6
Dependent Claim
36 words
A control means as claimed in claim 4, wherein said means for limiting the pulse rate range includes further contacts on said contactor, which further contacts limit the pulse rate range when the contactor is energised.
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |