SU1317624A1 - D.c.electric drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used in devices for controlling electric motors connected to elastic communication mechanisms. Improving the quality of regulation is provided by introducing a second speed controller 10, one of the inputs of which is connected to a speed setting 9, another inverting input through a proportional-differentiating unit 15 is connected to a motor speed sensor 7 1. The third inverting input of a regulator 10 through another proportional -differentiating unit 16 is connected to the sensor 8 of the speed of the mechanism, and the output is connected to one of the inputs of the first regulator 3 d. In this device, the magnitude of the dynamic error does not depend on the parameters of the power section of the drive, with the exception of the ratio of the moments of inertia of the engine and mechanism. 1 il. ( (ABOUT

Description

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The invention relates to electrical engineering and can be used in direct current electric drives with an elastic coupling between an electric motor and a mechanism.

The purpose of the invention is to improve the quality of electric drive control.

The drawing shows the scheme of the proposed electric drive.

The direct current drive contains a direct current motor 1 connected to the thyristor power unit 2 and connected via an elastic connection to a mechanism connected in series with the first regulator 3 rotational speed, the current regulator 4 and the pulse shaping system 5 which is connected to the input of the thyristor power unit 2, the current sensor 6, the sensor 7 of the rotation frequency of the electric motor 1; and the sensor 8 of the rotation frequency of the mechanism, the outputs of which are connected to the inputs of the first through rigid and flexible feedback speed regulator 3 and current regulator 4, frequency controller 9, second rotation frequency controller 10, the first input of which is connected to output of frequency controller 9, and output connected to the first input of first frequency regulator 3, the first proportional -differentiating unit 11, connected between the inlet of current sensor 6 and the second input of current regulator 4, the adder 12, whose inputs are connected to the outputs of sensors 7 and 8 of the rotational speed of the electric motor and mechanism, and the output connected to the second input of the first regul 3 rotational speed, differentiating unit 13 and the second proportional-differentiating unit 14, whose inputs are connected to the output of the motor speed sensor 7, and the outputs are connected to the third inputs of the current regulator 4 and the first frequency regulator 3, respectively, the third and quarter proportional-differentiating units 15 and 16, the outputs of which are connected to the BTOpoNry and the third inputs of the second controller 10, respectively, the rotation frequency, and the inputs are connected to the inputs of the sensors 7 and 8 of the rotation frequency of the electric motor mechanism.

The drive works as follows.

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The signal from the setpoint generator 9 of the rotational speed arrives at one of the inputs of the second regulator 10 of the rotational speed, the other inputs of which receive signals of negative flexible and rigid feedbacks according to the speeds of the electric motor 1 and the mechanism. The second regulator 10 speed, together with the blocks specified

Feedbacks forming the dependence of the frequency of rotation of the mechanism on the time of the IGSS), is made in the form of a proportional-integrating-differentiating unit. The signal from the second controller

10 rotational frequencies are fed to the first input of the first regulator, 3 rotational frequencies, to the other inputs of which hard positive feedback signals are received.

frequency of rotation of the motor and mechanism, rigid and flexible negative feedback on the frequency of rotation of the motor. The first regulator 3 rotational speed, together with blocks of these feedbacks, forms the dependence of the rotational speed of the electric motor on time) and compensates

internal feedback on the moment of elasticity, is executed in the form of a proportional-integro-differentiating block with a cut-off value at its output. The signal from the first speed regulator 3 is fed to the input

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current regulator 4, to the other inputs of which rigid and flexible negative current feedback and flexible positive feedback are applied according to the frequency of rotation of the motor. The current regulator 4, together with the blocks of the specified feedback, forms the dependence of the current of the engine core circuit on time i (t) and compensates the electromagnetic constant and internal feedback in terms of the frequency of rotation of the electric motor, i.e. compensating effect of EMF, is made in the form of a proportional integrating unit. The signal from the regulator 4 is fed to the input of the pulse shaping system 5, which supplies pulses to the opening of the thyristors in the thyristor power unit 2, 55 the pulse supply time to the opening of the thyristors, and consequently, the voltage on the main winding of the motor depends current.

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Thus, the dependences of the rotational frequencies of the electric motor and mechanism, as well as the current of the electrical circuit of the electric motor on the time, are determined by the position of the speed knob and the setting of the speed regulators, current and feedback blocks.

Claims (1)

Invention Formula A DC motor that contains a DC motor connected to a thyristor power unit and connected via an elastic coupling to a mechanism connected in series with a first frequency controller of rotation, a current controller and a pulse shaping system, the output of which is connected to. The input of the thyristor-power unit, the current sensor, the rotational speed sensor of the electric motor and the rotational speed sensor of the mechanism, the outputs of which are connected via rigid and flexible feedback to the inputs of the rotational speed and current speed regulators, the rotational speed sensor is different in that the purpose of increasing the quality of regulation, Compiled by V. Trofimenko Editor A. Ogar Tehred in, Kadar Proofreader r, Trashtnik Order 2432/53 Circulation 660. Subscription VNSHPI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Rauschska nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 4 4 It introduced the second speed controller, the first input of which is connected to the output of the speed setting device, and the output is connected to the first input of the first speed controller, the first proportional differentiating unit connected between the current sensor output and the second input of current regulator, adder, inputs which are connected to the outputs of the rotational speed sensors electric motors and mechanism, and the output is connected to the second input of the first speed regulator, the differentiating unit and the second proportional-differentiation unit, the inputs of which are connected to the output of the motor speed sensor, and the codes are connected to the third inputs, respectively current regulator and the first rotation frequency regulator, the third and fourth proportional-differentiating units, the outputs of which are connected respectively to the second and third the inputs of the second speed regulator, and the inputs are connected to the inputs of the rotational speed sensors of the electric motor and mechanism.