US3760252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damping of a step servo motor using one step anticipation logic
Assignee: Unisys Corp
•
Filing: 1972-07-05
•
Granted: 1973-09-18
•
Expires: 1992-07-05
Abstract
Abstract A damping means for a stepper motor that will enable the motor to rotate between any two positions in either direction in a minimum of time. During rotation the actual position of the rotor is compared to the destination position and this comparison, in light of the direction of rotation, is utilized to determine when the rotor is one step from the destination. When the rotor reaches the point one step from the final position, a damping signal causes the energization of the stator coils thus producing a damping force that will prevent overshoot and oscillation about the destination position by gradually reducing the rate of angular rotation of the motor as it approaches the final position.
Inventors
- 👤 J Beery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:56
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/27; G05B19/29; G05B19/291; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41326; G05B2219/42; G05B2219/42212
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
An electrical damping control system for use in a servo control mechanism comprising: a plurality of separately energizable induction coils arranged about the axis of a magnetic rotor; control means for positioning a magnetic rotor in any selected one of a number of angularly displaced positions by causing said rotor to rotate in the direction requiring the fewest steps to said selected position; position indicator means operatively connected to said rotor to indicate the present position of said rotor; comparator means operatively connected to said control means and said position indicator to determine when said rotor is one step from said selected position; and electrical damping control means responsive to said comparator and operable to apply a damping voltage to said induction coils when said rotor is one step from said selected position, thereby stopping said rotor at said selected position.
Claim 2
Dependent Claim
141 words
An electrical damping control system for use in a servo control mechanism comprising: a plurality of separately energizable induction coils arranged about the axis of a magnetic rotor; control means for positioning a magnetic rotor in any selected one of a number of angularly displaced positions by causing said rotor to rotate in the direction requiring the fewest steps to said selected position; position indicator means operatively connected to said rotor to indicate the present position of said rotor; comparator means operatively connected to said control means and said position indicator to determine when said rotor is one step from said selected position; and electrical damping control means responsive to said comparator and operable to apply a damping voltage to said induction coils when said rotor is one step from said selected position, thereby stopping said rotor at said selected position.
Claim 3
Dependent Claim
116 words
An electrical damping system for use in a servomechanism comprising: a first signal means for indicating the selected position of a servo motor rotor; a second signal means for indicating the actual position of said rotor; a comparator means for comparing said first signal means with said second signal means to determine when said rotor is one step from said selected position, regardless of direction of rotation; and an electrical damping means responsive to said comparator and operable to apply a voltage to each non-energized induction coil of said servomechanism effective to reduce the rate of angular rotation of said rotor one step from said selected position and to stop said rotor at said selected position.
Claim 4
Dependent Claim
116 words
An electrical damping system for use in a servomechanism comprising: a first signal means for indicating the selected position of a servo motor rotor; a second signal means for indicating the actual position of said rotor; a comparator means for comparing said first signal means with said second signal means to determine when said rotor is one step from said selected position, regardless of direction of rotation; and an electrical damping means responsive to said comparator and operable to apply a voltage to each non-energized induction coil of said servomechanism effective to reduce the rate of angular rotation of said rotor one step from said selected position and to stop said rotor at said selected position.
Claim 5
Dependent Claim
88 words
The electrical damping mechanism defined in claim 2 wherein said comparator means comprises: a first circuit means to compare the states of the binary representations of said first signal means with the states of the binary representation of said second signal means; and a second circuit means operatively connected to said first circuit means to compare the binary output of said first circuit means with the binary representations of said second signal means thereby producing a signal indicating when said rotor is one step from said selected position.
Claim 6
Dependent Claim
95 words
A logic circuit for determining when the rotor of a servomechanism is within one position of a selected position regardless of direction of rotation comprising: a first circuit means to compare binary signals representing the selected position of said rotor with the actual position of said rotor; and a second circuit means operatively connected to said fIrst circuit means to compare the output of said first circuit means with said binary signals representing the actual position of said rotor operative to produce a signal when said rotor is within one position of the selected position.
Claim 7
Dependent Claim
95 words
A logic circuit for determining when the rotor of a servomechanism is within one position of a selected position regardless of direction of rotation comprising: a first circuit means to compare binary signals representing the selected position of said rotor with the actual position of said rotor; and a second circuit means operatively connected to said fIrst circuit means to compare the output of said first circuit means with said binary signals representing the actual position of said rotor operative to produce a signal when said rotor is within one position of the selected position.
References Cited (Backward Citations)
US3463985A
Cited
US3541418A
Cited
US3573589A
Cited
US3575653A
Cited
US3644812A
Cited
US3636429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |