SU1205127A1 - Control system - Google Patents

Description

one

The invention relates to instrumentation and automation and can be applied when implementing the frequency of rotation of the electric motor.

The purpose of the invention is to increase the speed and accuracy of the system.

The drawing shows a block diagram of the system.

The diagram shows the setting device 1, the main feedback sensor 2, the error meter 3, the differentiator 4, the first and second three-position relay elements 5 and 6, {tepBbift and the second elements And 7 and 8, the first and second controlled diodes 0 and 10, a summing amplifier 11, a servo-mechanism 12, a relay control unit 13, a switch ty, .f revenue signals of the setter T and the sensor 2 of the main feedback of the system, & the output signal of the differentiator 4, y.sh — output signal of the error meter 3 b - output signal of summing amplifier 1 f - output sig the switch 14 and the BI dead zones of the first and second three-position relay elements 5 and 6.

The composition of the relay control unit 13 includes the first and second three-position relay elements 5 and 6 and the first and second elements And 7 and 8.

The switch 14 includes first and second controlled diodes 9 and 10.

The servo-mechanism 12 contains parallel and serial links, a power amplifier, an executive motor and a gearbox and can be built according to a well-known standard functional diagram.

The system works as follows.

At the output of knob 1, a predetermined value of an adjustable parameter is generated, for example, frequency. At the output of the main feedback sensor 2, the current value of the controlled parameter, for example, frequency, is generated. The outputs of the setting device 1 and the main feedback sensor 2 are received "and the inputs и CoAi / j pri (. I i (or uu) -. (., Г7РИ-gj. R or- frti I,

 , With HQt MWAUj; f2HiU3 - (.

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The measurer 3 is the mismatch in which it is compared.

The output signal of the error meter 3 is fed to the input of the differentiator 4 without the second three-position relay element 1ent 6 and the first input of the summing amplifier 11

The output signal of the differentiator 4 is fed to the input of the first three-position relay element 5 and to the signal input of the switch 14.

ten

The first 5 and second 6 three-position elements, together with the first 7 and second 8 elements, together represent the relay control unit

laziness, which analyzes the signs of signals lo; and UU5 and their value relative to the insensitivity zone defined by the values, and g. If and L wj, then relay elements 5 and 6 are triggered, from the first outputs of which positive signals are received to the inputs of the element AND 7. At this, the element 7 also operates and at its output a signal is generated that is fed to the control input of the first controlled diode 9, under the influence of which it opens and passes the signal to the second input of summing amplifier 11, where the signal LG and the signal are summed, amplified and fed to the input of the servo mechanism 12.If & Lui i and, then relay elements 5 and 6 also work, from the second outputs of which negative signals go to the inverting input of element 8. And then the system works similarly, but instead of controlled diode 9, controlled diode 10 operates. if c. In this case, the elements 7 and 8 do not work, and the controlled diodes 9 and 10 remain in the closed position, and from the output of the amplifier 1 1 to the input of the servo-mechanism 12 only the amplified signal Lw comes. In the general case, a control signal (s), input to the servo-mechanism 12, is formed as follows:

The use of the proposed control system with a variable structure with respect to the first derivative of the error signal A u-i in the formation

of the regulation law increases the

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system action, i.e. reduces the time of the transition process by about 1.5-2 times and increases the dynamic and static accuracy of the system when

Editor E. Kopcha

Compiled by Y. Gladkov Tehred t.Dubinchak

Order 8529/50 Circulation 862 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Projectnar 4

Proofreader A. T sko

Claims (2)

1. CONTROL SYSTEM, comprising a serially connected master, a mismatch meter, a summing amplifier, a servo mechanism, and a main feedback sensor connected by an output to the second input of a mismatch meter connected by an output through a differentiator to a signal input of a switch connected by the first control input to the output of the relay control unit, and the output - to the second input of the summing amplifier, characterized in that, in order to increase the speed and accuracy of the system, it contains the first and second ode relay control unit are connected to the outputs of the differentiator and Meter misalignment, and the second output - to a second control input of the switch. 2. The system of pop. ^ characterized in that the relay control unit contains the first and second three-position relay elements, g first outputs connected to the inputs of the first element And, and the second outputs to the inputs of the second element And, the outputs of which are the outputs of the relay control unit, and the inputs of the three-position relay blocks are the inputs of the relay control unit. SU .. „1205127