Patent FR972050A successfully refreshed from Google Patents.
Patent US3818296A successfully refreshed from Google Patents.
US3818296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative braking control device for an electric car
Assignee: Toshiba Corp
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Filing: 1972-05-19
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Granted: 1974-06-18
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Expires: 1992-05-19
Abstract
Abstract A series D.C. electric motor is employed for the drive of an electric car, the field winding of which is connected in parallel with the armature of the motor while a regenerative brake is being made. The field winding has its excitation controlled by means of a thyristor chopper which is connected in series therewith to hold the regenerative effect both safely and steadily.
Inventors
- 👤 Y Torii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:47
CPC Classifications
B; B60; B60L; B60L7/00; B60L7/10; B60L7/12; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
325 words
A regenerative brake control system of the electric motors for driving an electric car which comprises; at least one d.c. electric motor for driving said electric car, said motor including an armature and at least one set of magnetic field windings for enabling excitation of said armature and functioning as a generator to return an electric power generator thereby when it is desired to brake said car; a solid state chopper connected in a main circuit which includes said d.c. electric motor therein, said chopper being adapted to adjust a powering and braking current of said motor to a predetermined level; and, means for changing connections of said chopper, motor armature and field windings in response to the manner of operation of said car, said d.c. electric motor being operated as a series field motor when a powering operation is desired to drive said car, and said d.c. electric motor being operated as a shunt field generator when a regenerative operation is desired for braking said car, said chopper being connected in series with said armature and said field windings while said car is making a powering operation, and said chopper being connected in series with said field windings, said series connection of said chopper at said field windings being interconnected and parallel with said armature when a regenerative braking operation for the electric car is desired, whereby the shunt field excitation of said motor is independent of said armature current during said regenerative braking operation, and wherein said chopper is connected in series with the field windings and said series connection of said chopper and said field windings in turn are connected in parallel with said armature to provide a weak field control while said car is powered at a high speed, said d.c. motor being operated as a shunt motor during said weak field control, whereby said chopper controls the shunt field current independently of the armature current during said weak field control.
Claim 2
Dependent Claim
325 words
A regenerative brake control system of the electric motors for driving an electric car which comprises; at least one d.c. electric motor for driving said electric car, said motor including an armature and at least one set of magnetic field windings for enabling excitation of said armature and functioning as a generator to return an electric power generator thereby when it is desired to brake said car; a solid state chopper connected in a main circuit which includes said d.c. electric motor therein, said chopper being adapted to adjust a powering and braking current of said motor to a predetermined level; and, means for changing connections of said chopper, motor armature and field windings in response to the manner of operation of said car, said d.c. electric motor being operated as a series field motor when a powering operation is desired to drive said car, and said d.c. electric motor being operated as a shunt field generator when a regenerative operation is desired for braking said car, said chopper being connected in series with said armature and said field windings while said car is making a powering operation, and said chopper being connected in series with said field windings, said series connection of said chopper at said field windings being interconnected and parallel with said armature when a regenerative braking operation for the electric car is desired, whereby the shunt field excitation of said motor is independent of said armature current during said regenerative braking operation, and wherein said chopper is connected in series with the field windings and said series connection of said chopper and said field windings in turn are connected in parallel with said armature to provide a weak field control while said car is powered at a high speed, said d.c. motor being operated as a shunt motor during said weak field control, whereby said chopper controls the shunt field current independently of the armature current during said weak field control.
Claim 3
Dependent Claim
39 words
A regenerative brake control system of electric motors for driving an electric car according to claim 1, wherein said electric motor comprises a self-excited shunt field generator while the regenerative braking of said d.c. electric motor is taking place.
Claim 4
Dependent Claim
26 words
A regenerative brake control of electric motors for driving an electric car according to claim 1, wherein said solid state chopper is of the thyristor type.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |