US3601677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensated servosystem
Assignee: Houdaille Industries Inc
•
Filing: 1969-10-20
•
Granted: 1971-08-24
•
Expires: 1989-10-20
Abstract
Abstract A motor control circuit for a servosystem which includes trigger circuits for controlling the direction and speed of a motor and which has temperature compensation to assure accurate and positive control. The control system of this invention is very stable and is not affected by temperature changes because temperature compensating means including a transistor and a Zener diode are connected in circuit with a differential amplifier so as to compensate for any temperature variations.
Inventors
- 👤 Kenneth R Macdavid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:35
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/10; H02P25/14; H02P25/145; G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1445; G05D3/18; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/91; Y10S388/917; Y10S388/923; Y10S388/934
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
232 words
A servomotor control circuit comprising, a motor with an armature and said motor rotates in a direction determined by the polarity of current applied to said armature, bidirectional current switching means with gating means connected in series with said armature, an alternating current power source connected across said armature and said switching means, a pair of phasecontrol trigger circuits connected to said gating means, a differential amplifier connected to said pair of trigger circuits, a polarized speed command signal means connected to said differential amplifier, said bidirectional current switching means comprises a pair of silicon-controlled rectifiers connected back-to-back in series with said armature, said pair of phasecontrol trigger circuits connected to the gating means of said silicon-controlled rectifiers, a first transformer connected between the gating means of the first of said pair of siliconcontrolled rectifiers and the first of said pair of phase-control trigger circuits, a second transformer connected between the gating means of the second of said pair of silicon-controlled rectifiers and the second of said pair of phase-control trigger circuits, a first diode poled to pass current in a first direction between said armature and a first of said pair of phase-control trigger circuits, a second diode poled to pass current in a second direction between said armature and a second of said pair of phase-control trigger circuits, and a temperature compensating means connected in circuit with said differential amplifier.
Claim 2
Dependent Claim
232 words
A servomotor control circuit comprising, a motor with an armature and said motor rotates in a direction determined by the polarity of current applied to said armature, bidirectional current switching means with gating means connected in series with said armature, an alternating current power source connected across said armature and said switching means, a pair of phasecontrol trigger circuits connected to said gating means, a differential amplifier connected to said pair of trigger circuits, a polarized speed command signal means connected to said differential amplifier, said bidirectional current switching means comprises a pair of silicon-controlled rectifiers connected back-to-back in series with said armature, said pair of phasecontrol trigger circuits connected to the gating means of said silicon-controlled rectifiers, a first transformer connected between the gating means of the first of said pair of siliconcontrolled rectifiers and the first of said pair of phase-control trigger circuits, a second transformer connected between the gating means of the second of said pair of silicon-controlled rectifiers and the second of said pair of phase-control trigger circuits, a first diode poled to pass current in a first direction between said armature and a first of said pair of phase-control trigger circuits, a second diode poled to pass current in a second direction between said armature and a second of said pair of phase-control trigger circuits, and a temperature compensating means connected in circuit with said differential amplifier.
Claim 3
Dependent Claim
38 words
A servomotor control circuit according to claim 1 wherein said temperature compensating means comprises a transistor with its output connected to said differential amplifier and a Zener diode connected between the base and emitter electrodes of said transistor.
Claim 4
Dependent Claim
204 words
A servomotor control circuit comprising, a motor with an armature and said motor rotates in a direction determined by the polarity of current applied to said armature, bidirectional current switching means with gating means connected in series with said armature, an alternating current power source connected across said armature and said switching means, a pair of phase-control trigger circuits connected to said gating means, a differential amplifier connected to said pair of trigger circuits, a polarized speed command signal means connected to said differential amplifier, a first diode poled to pass current in a first direction between said armature and a first of said pair of phase-control trigger circuits, a tachometer coupled to said motor and supplying a signal to said differential amplifier, a filter connected between said tachometer and said differential amplifier, said bidirectional current switching means comprises a triac and said pair of phase-control trigger circuits connected to the gating means of said triac, a resistor and a capacitor connected in parallel with said triac, a position followup signal generating means coNnected to said motor and said position followup signal generating means connected to said polarized speed command signal means, and a temperature compensating means connected in circuit with said differential amplifier.
Claim 5
Dependent Claim
204 words
A servomotor control circuit comprising, a motor with an armature and said motor rotates in a direction determined by the polarity of current applied to said armature, bidirectional current switching means with gating means connected in series with said armature, an alternating current power source connected across said armature and said switching means, a pair of phase-control trigger circuits connected to said gating means, a differential amplifier connected to said pair of trigger circuits, a polarized speed command signal means connected to said differential amplifier, a first diode poled to pass current in a first direction between said armature and a first of said pair of phase-control trigger circuits, a tachometer coupled to said motor and supplying a signal to said differential amplifier, a filter connected between said tachometer and said differential amplifier, said bidirectional current switching means comprises a triac and said pair of phase-control trigger circuits connected to the gating means of said triac, a resistor and a capacitor connected in parallel with said triac, a position followup signal generating means coNnected to said motor and said position followup signal generating means connected to said polarized speed command signal means, and a temperature compensating means connected in circuit with said differential amplifier.
Claim 6
Dependent Claim
38 words
A servomotor control circuit according to claim 3 wherein said temperature compensating means comprises a transistor with its output connected to said differential amplifier and a Zener diode connected between the base and emitter electrodes of said transistor.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |