GB1330176A - Servo control systems - Google Patents

Servo control systems

Info

Publication number
GB1330176A
GB1330176A GB1330176DA GB1330176A GB 1330176 A GB1330176 A GB 1330176A GB 1330176D A GB1330176D A GB 1330176DA GB 1330176 A GB1330176 A GB 1330176A
Authority
GB
United Kingdom
Prior art keywords
control
amplifier
difference
drive
aug
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leck J H
Original Assignee
Leck J H
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Leck J H filed Critical Leck J H
Publication of GB1330176A publication Critical patent/GB1330176A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B6/00—Internal feedback arrangements for obtaining particular characteristics, e.g. proportional, integral, differential
    • G05B6/02—Internal feedback arrangements for obtaining particular characteristics, e.g. proportional, integral, differential electric
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
    • G05D16/202—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means actuated by an electric motor

Abstract

1330176 Automatic control of pressure J H LECK 13 Aug 1971 [14 Aug 1970] 39180/70 Heading G3R A control unit for a closed loop servosystem comprises a summing amplifier 26 in which measured V P and reference V R values of a controlled variable are combined with an alternating waveform V S which is thus displaced from the origin by the difference between V P and V R , the output V 1 being applied to a saturating amplifier 30 to produce alternate positive and negative pulses V 2 whose duty cycle depends upon the displacement of V S from the origin and which are used to drive a reversible correcting mechanism, the net drive being such as to reduce the difference between V P and V R . If the difference is large the amplifier saturates in one direction, thereby applying a maximum rate of correction. The summing amplifier 26 also receives the differential of V P from 28, and its bandwidth is less than the frequency of V s so that the square wave V 2 may control a a triangular shape. The signal V 2 may control a phase sensitive drive amplifier 32 which energizes the control winding of a servomotor 18. 24 is a range selector. The measured variable may be the pressure in a vacuum tank and the servomotor control a leak valve Fig. 1 (not shown).
GB1330176D 1970-08-14 1970-08-14 Servo control systems Expired GB1330176A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3918070 1970-08-14

Publications (1)

Publication Number Publication Date
GB1330176A true GB1330176A (en) 1973-09-12

Family

ID=10408124

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1330176D Expired GB1330176A (en) 1970-08-14 1970-08-14 Servo control systems

Country Status (1)

Country Link
GB (1) GB1330176A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4813339A (en) * 1984-11-09 1989-03-21 Hitachi, Ltd. Pulse-width-modulation control of parallel three-way valves to supply single-acting quick-response actuator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4813339A (en) * 1984-11-09 1989-03-21 Hitachi, Ltd. Pulse-width-modulation control of parallel three-way valves to supply single-acting quick-response actuator

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee