US3593085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed and position control for electric motor
Assignee: Individual
•
Filing: 1969-12-18
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Granted: 1971-07-13
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Expires: 1989-12-18
Abstract
Abstract A precision speed and position control for an electric motor having a DC brake winding, comprising a transistor amplifier for energizing the brake winding and having a control potentiometer for varying the amplifier output, and an on-off switch for opening and closing the drive circuit of the motor; the on-off switch is mechanically interlocked with the potentiometer to afford maximum brake excitation whenever the switch is off.
Inventors
- 👤 Ernest J Decker Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:57
CPC Classifications
H; H02; H02P; H02P29/00; H02P29/0016; H02P29/0022
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
175 words
A precision speed and position control for an alternating current electric motor, of the kind including a rotor, a drive winding field-coupled to the rotor, and a brake winding fieldcoupled to a separate part of the rotor, comprising: a drive circuit, elecTrically coupling said drive winding to an AC power supply, said drive circuit including on-off switch means; a brake circuit, electrically coupling said brake winding to said power supply, said brake circuit comprising a rectifier in series with a solid-state DC amplifier, said amplifier including a control potentiometer continuously adjustable between a home position in which said amplifier supplies maximum braking current to said brake winding and a release position in which said amplifier supplies minimal braking current to said brake winding, affording a continuously variable speed control for the motor; and means mechanically interconnecting said control potentiometer and said on-off switch means to adjust said potentiometer to its home position whenever said switch means is actuated to its ''''off'''' condition, maintaining the motor at any given orientation whenever the drive winding is deenergized.
Claim 2
Dependent Claim
175 words
A precision speed and position control for an alternating current electric motor, of the kind including a rotor, a drive winding field-coupled to the rotor, and a brake winding fieldcoupled to a separate part of the rotor, comprising: a drive circuit, elecTrically coupling said drive winding to an AC power supply, said drive circuit including on-off switch means; a brake circuit, electrically coupling said brake winding to said power supply, said brake circuit comprising a rectifier in series with a solid-state DC amplifier, said amplifier including a control potentiometer continuously adjustable between a home position in which said amplifier supplies maximum braking current to said brake winding and a release position in which said amplifier supplies minimal braking current to said brake winding, affording a continuously variable speed control for the motor; and means mechanically interconnecting said control potentiometer and said on-off switch means to adjust said potentiometer to its home position whenever said switch means is actuated to its ''''off'''' condition, maintaining the motor at any given orientation whenever the drive winding is deenergized.
Claim 3
Dependent Claim
65 words
A precision speed and position control for an electric motor, according to claim 1, in which said DC amplifier comprises a transistor having an input electrode, an output electrode, and a control electrode, said input and output electrodes being connected in series between said rectifier and said brake winding, and said control potentiometer being connected in a circuit connecting said rectifier to said control electrode.
Claim 4
Dependent Claim
73 words
A precision speed and position control for an electric motor, according to claim 2, in which said on-off switch means is a two-pole switch having a first pole connected in said drive circuit and having a second pole connected in series with a current-limiting impedance between said rectifier and said control electrode to supply a predetermined maximum control signal to said control electrode whenever said on-off switch means is in its ''''off'''' condition.
Claim 5
Dependent Claim
66 words
A precision speed and position control for an electric motor, according to claim 2, for use with a reversible motor, in which said on-off switch means has two different on operating conditions, one for each direction of motor rotation, and in which the said potentiometer has two release positions at the opposite ends of the potentiometer, the home position for the potentiometer being its center position.
Claim 6
Dependent Claim
53 words
A precision speed and position control for a reversible electric motor, according to claim 4, in which said potentiometer has a center tap connected to said rectifier through a small current-limiting resistor to supply a predetermined maximum control signal to said control electrode whenever said on-off switch means is in its ''''off'''' condition.
References Cited (Backward Citations)
USRE24168E
Cited
US3201674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |