US3586941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensating system for a series servomotor
Assignee: TOKYO ELECT ENG CO
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Filing: 1969-07-23
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Granted: 1971-06-22
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Expires: 1989-07-23
Abstract
Abstract A compensating system for a series servomotor which improves various characteristics of the motor by causing same to operate as a separately excited motor when its control voltage is low and as a series motor when its control voltage is increased.
Inventors
- 👤 Tadao Fujimaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:40
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/18; H02P1/20; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; H02P7/292; H02P7/293
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
168 words
A circuit for improving the starting characteristics of a series-wound, direct current servomotor having an armature winding and a field winding connectable to a source of DC control voltage, which comprises: a first rectifying bridge circuit having first and second AC terminals and first and second DC terminals, the armature winding of said servomotor being serially connected with said source of the DC control voltage, across said first and second AC terminals; and compensating means, serially connected with said field winding across said first and second DC terminals, for supplying a continuous, unidirectional field current to said servomotor, regardless of the magnitude or direction of the current flowing through the armature winding thereof, a similarly poled pair of the rectifying elements in said first bridge circuit becoming back-biased when the magnitude of said DC control voltage increases to the point where said armature current equals or exceeds said field current, thereby effectively placing sAid armature winding in series with said field winding for normal operation of said servomotor.
Claim 2
Dependent Claim
168 words
A circuit for improving the starting characteristics of a series-wound, direct current servomotor having an armature winding and a field winding connectable to a source of DC control voltage, which comprises: a first rectifying bridge circuit having first and second AC terminals and first and second DC terminals, the armature winding of said servomotor being serially connected with said source of the DC control voltage, across said first and second AC terminals; and compensating means, serially connected with said field winding across said first and second DC terminals, for supplying a continuous, unidirectional field current to said servomotor, regardless of the magnitude or direction of the current flowing through the armature winding thereof, a similarly poled pair of the rectifying elements in said first bridge circuit becoming back-biased when the magnitude of said DC control voltage increases to the point where said armature current equals or exceeds said field current, thereby effectively placing sAid armature winding in series with said field winding for normal operation of said servomotor.
Claim 3
Dependent Claim
71 words
The circuit according to claim 1 wherein said compensating means comprises a second rectifying bridge circuit having first and second AC terminals and first and second DC terminals, the DC terminals of said second bridge circuit being included in the series connection of said field winding and the DC terminals of said first bridge circuit; and circuitry connecting the AC terminals of said second bridge circuit to a compensating voltage source.
Claim 4
Dependent Claim
16 words
The circuit according to claim 2 wherein said compensating voltage source is a direct current source.
Claim 5
Dependent Claim
16 words
The circuit according to claim 2 wherein said compensating voltage source is an alternating current source.
Claim 6
Dependent Claim
29 words
The circuit according to claim 1 wherein said compensating means comprises: a single phase, half-wave rectifying circuit; and circuitry connecting said rectifying circuit to a single phase AC source.
Claim 7
Dependent Claim
47 words
The circuit according to claim 5, wherein said single-phase, half-wave rectifying circuit includes a transformer having a primary winding and a secondary winding, said primary winding being connected to said AC source and said secondary winding being serially connected with said field winding to a rectifying diode.
Claim 8
Dependent Claim
27 words
The circuit according to claim 1 wherein said compensating means comprises: a single-phase, full-wave rectifying circuit; and circuitry connecting said rectifying circuit to a single-phase AC source.
Claim 9
Dependent Claim
59 words
The circuit according to claim 7 wherein said single-phase, full-wave rectifier includes a transformer, having a primary winding and a center-tapped secondary winding, said primary winding being connected to said AC source, said center-tap being connected to said field winding, and a pair of rectifying diodes connecting the outermost terminals of said secondary winding to said first bridge circuit.
Claim 10
Dependent Claim
27 words
The circuit according to claim 1 wherein said compensating means comprises: a three-phase, full-wave rectifying circuit; and circuitry connecting said rectifying circuit to a three-phase AC source.
Claim 11
Dependent Claim
51 words
The circuit according to claim 9, wherein said three-phase, full-wave rectifying circuit includes three pairs of serially-connected, rectifying diodes, connected in parallel, in series with the field coil of said servomotor, the center tap of each pair of serially-connected, rectifying diodes being connected to respective phases of said three-phase AC source.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |