Patent US4401927A successfully refreshed from Google Patents.
US4401927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and device to control the electric braking of a direct current motor
Assignee: Compagnie Electro Mecanique SA
•
Filing: 1981-04-16
•
Granted: 1983-08-30
•
Expires: 2001-04-16
Abstract
Abstract A direct current motor includes a chopper in series with the field coil of the motor to regulate the current flowing through the armature of the motor during electrical braking when the motor functions as a generator to produce current. In addition, a shunting device is connected to the field coil to regulate the current flowing through the coil so that it is maintained at a value less than the armature current.
Inventors
- 👤 M. N'Guyen U. Thuy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:17
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/08; H02P3/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
In a direct current motor of the type having a field coil and a current chopper connected in parallel with the motor armature between the armature and the load and wherein the field coil is excited by current from the armature when the chopper is closed during braking, a method for controlling the electric braking of the motor comprising the steps of: providing a shunt device across said field coil; regulating the current in said armature by means of said chopper; and regulating the current in said field coil by adjusting the flow of current through said shunt device, whereby the braking force of the motor is maintained at a level lower than the rated power of the motor.
Claim 2
Dependent Claim
119 words
In a direct current motor of the type having a field coil and a current chopper connected in parallel with the motor armature between the armature and the load and wherein the field coil is excited by current from the armature when the chopper is closed during braking, a method for controlling the electric braking of the motor comprising the steps of: providing a shunt device across said field coil; regulating the current in said armature by means of said chopper; and regulating the current in said field coil by adjusting the flow of current through said shunt device, whereby the braking force of the motor is maintained at a level lower than the rated power of the motor.
Claim 3
Dependent Claim
89 words
A direct current motor and a circuit for controlling the electric braking of said motor, comprising: an armature adapted to be connected across a load; a series connection of a field coil and a current chopper in parallel with said armature and disposed between the armature and a load such that said field coil is excited by current from said armature when said chopper is closed during braking of the motor; and means connected in parallel with said field coil variably shunting the current passing through said field coil.
Claim 4
Dependent Claim
89 words
A direct current motor and a circuit for controlling the electric braking of said motor, comprising: an armature adapted to be connected across a load; a series connection of a field coil and a current chopper in parallel with said armature and disposed between the armature and a load such that said field coil is excited by current from said armature when said chopper is closed during braking of the motor; and means connected in parallel with said field coil variably shunting the current passing through said field coil.
Claim 5
Dependent Claim
17 words
The motor circuit of claim 2 wherein said shunting means is an electromechanical device that operates discontinuously.
Claim 6
Dependent Claim
14 words
The motor circuit of claim 2 wherein said shunting means is a solid-state device.
Claim 7
Dependent Claim
76 words
A direct current motor and a circuit for controlling the electric braking of said motor, comprising: an armature adapted to be connected across a load; a series connection of an inductor, and a current chopper in parallel with said armature and disposed so as to be between the armature and a load; and means comprising a resistance and a thyristor, each connected in parallel with said inductor, for controllably shunting the current passing through said inductor.
Claim 8
Dependent Claim
76 words
A direct current motor and a circuit for controlling the electric braking of said motor, comprising: an armature adapted to be connected across a load; a series connection of an inductor, and a current chopper in parallel with said armature and disposed so as to be between the armature and a load; and means comprising a resistance and a thyristor, each connected in parallel with said inductor, for controllably shunting the current passing through said inductor.
Claim 9
Dependent Claim
17 words
The motor circuit of claim 5 further including a free-wheel diode connected in parallel with said inductor.
Claim 10
Dependent Claim
20 words
The motor circuit of claim 5 further including a diode connected between the anode of said thyristor and said inductor.
References Cited (Backward Citations)
US3519907A
Cited
FR2040913A5
Cited
US3651390A
Cited
FR2052515A5
Cited
DE2050822A1
Cited
DE2140906A1
Cited
US3983465A
Cited
US4187436A
Cited
US4267492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |