SU1019569A1 - Reversible thyratron electric drive combined with direct-current motor - Google Patents

Abstract

- REVERSIVE VENTILATION ELECTRIC DRIVE WITH DC MOTOR, containing reversible t-faen valve converter, the output of which is connected to the DC core of the DC motor, and the control inputs connected to the outputs of the phase-pulse control of the converter, with a draw pattern. a voltage conversion node, and the other three inputs are connected, respectively, to the Forward, the Back and the inhibiting output of the logic switch with two inputs, the controller a two-output growth, the first input of which is connected to the output of a speed sensor connected; The motor has a direct current shaft, the second input is connected to the speed limiter, and the first output is connected to the first input of the voltage conversion unit, the other two inputs of which are connected to the Forward and Backward paths of the logic switching unit, This is due to the fact that, with the aim of increasing reliability, it is additionally equipped with a relay element with a hysteresis, a isolation valve, an AND-NIC node and a control current control unit, which is the input of the relay element with a hysteresis It is connected to the second output of the speed controller, and the output is connected to the first input of a logic switch for the block, the second CO input of which is connected to the output of a 1R

Description

The invention relates to electrical engineering and can be used in an automated electric drive with separate control. A reversible valve electric drive with a DC motor is known, which comprises a valve converter, a control unit, a transducer conductivity sensor, a speed sensor, a logic switching unit, a tl3 speed control unit. However, this drive has low reliability due to limited sensitivity and redundancy of control channels. The closest in technical essence to the present invention is a reversible valve electric drive with a DC motor, containing a reversible. T-phase valve transducer, the output of which is connected to the main winding of the DC motor, and the control inputs are connected to the outputs of the phase-pulse unit a converter with a power supply circuit, the first input of which is connected to the output of the voltage conversion unit, and the other three inputs are connected, respectively, to the Forward, Backward and prohibiting outputs a logic switch unit with two inputs; a two-speed speed controller; the first input of which is connected to the output of a speed sensor connected to the shaft of a direct current motor, the second input is connected to a speed reference, and the first output is connected to the first input of the conversion unit conductivity sensor, the other two inputs of which are connected to the Forward and Back outputs of the logical switching unit, the conductivity sensor, while the second output of the speed controller is connected to the first input of the logical switching unit, the second input One of which is connected with the output of the conductivity converter conductivity sensor. However, in the known reversible valve electric drive with a DC motor, it is possible that electric power supply emergency conditions occur at small control voltages commensurate with the disturbance, which reduces reliability. The aim of the invention is to increase the reliability of drive control. This goal is achieved by the fact that a reversible valve motor with a DC motor contains a reversible T-phase valve converter, the output of which is connected to the main winding of a DC motor, and the control inputs are connected to the outputs of the pulsed-phase converter control unit with a power supply circuit. , the first input of which is connected to the output of the voltage conversion unit, and the other three inputs are connected respectively to the Forward, Backward and disabling output of the logic switch About the unit with two inputs, a speed controller with two outputs, the first input of which is connected to the output of the speed sensor connected to the DC motor shaft, the second input is connected to the speed limiter, and the first output is connected to the first input of the voltage conversion unit , the other two inputs of which are connected to the Forward and Back outputs of the logical switching unit., and the conductivity sensor of the valve converter is additionally equipped with a relay element with hysteresis, a dividing valve, the NAND logic node and the block ohm of current control, while the input of the relay element with hysteresis is connected to the BTOPEJM output of the speed regulator, and the output to the first input of the logic switching unit, the second input of which is connected to the output of the logical node AND –NE, the first input of the latter, is connected to the output of the valve conductivity sensor the converter, and the second input - with the output of the current control unit connected through the isolation valve to the power supply circuit of the phase-pulse control unit of the converter. FIG. 1 shows a diagram of a reversible valve actuator; in fig. 2 - the same, the conductivity sensor) in FIG. 3 - the same, current control unit; in fig. 4 time diagrams of voltages and currents. A reversible valve motor with a DC motor (Fig. 1) contains a reversible T-phase valve converter, the output of which is connected to the main winding of a DC motor 2, and the control inputs are connected to the outputs of the unit 3 of the phase-pulse converter control a power supply circuit 4, the first input 5 of which is connected to the output of the voltage conversion unit 6, and the other three inputs 7-9 are connected respectively to the output terminal forward 10, backward 11 and the inhibitory output 12 of the logical switching unit 13 with two inputs 14 and 15, a speed controller 16 with two outputs 17 and 18, the first input 19 of which is connected to the output of a speed sensor 20 connected to the DC motor 2, the second input 21 is connected to a speed setter, and the first. th output 17 is connected to the first input of the voltage conversion unit b, the other two inputs of which are connected to the outputs) Forward

10 and Back 11 logical switches of block 13, conductivity sensor 22, relay element 23 with hysteresis, logical node AND 24, and block 25 of current control, while

input relay element 23 with gks-. the teresis is connected to the second output 18 of the speed regulator, and the output to the first input 14 of the logic switching unit 13, the second input 15 of which is connected to the output of the logic node -.AND- 24, the first input of the latter is connected to the output of the conductivity sensor 22 of the converter, and the second input is with the output of the current control unit 25 included in the power supply 4 of the unit 3 of the phase-pulse control of the converter converter 1,

Conductivity sensor 22 (Fig. 2) contains information block 26, the inputs of which are connected to the input and output of the valve converter, logic circuit 27, of which diode optocoupler pairs are connected respectively by LEDs to the outputs of the information block 26, and sequentially and according to each other connected photodiodes through the Zener diode 28 to the input of the amplifier 29, while the cathode output of the photodiode circuit is connected to the cathode of the Zener diode 28. and through a resistor 30 to the positive pole of the power supply of the control system.

The current control unit 25 contains (FIG. 3) an electronic relay element 31, the input of which is connected to the power supply circuit 4 of the phase impulse control unit 3 of the valve converter via a separation valve 32, while the anode of the latter is connected to the positive pole. the power supply unit of the phase-pulse control unit 3, whose potential is lower than the positive potential of the power source of the electronic relay element 31:

The reversible valve motor with a DC motor operates as follows.

The control voltage U. (Fig. 4) from the output 18 of the speed regulator 16 enters the input of the relay element 23 with a hysteresis, at the output of which the voltage U p is formed. This signal is fed to the input 14 of the logical switching unit 13, at the output 10 of which the Forward is formed by a voltage of U35J and the output

11 (Back) - voltage, and on the inhibiting output 12 - voltage

Uj-j. If we assume that the polarization of the control voltage changes at the output 18 of the speed regulator 16, then the signal from the output of the relay element 23 changes from 1 to O. The signal .O. Arrives at the input 14 of the logic switching unit 13 and is a locking requirement Forward groups and unlocks the back of the inverter groups. At the same time, the control voltage from the output 17 of the speed regulator is fed to the input of the voltage conversion unit 6, from the output of which the voltage (038 converted by sign and limited to given values (-U and) goes to the control inputs of the unit 3 of the phase-pulse control of the converter Each control channel compares the sawtooth voltage Uj with the voltage of the Ugg control. Then, in the amplifiers of the formers, pulses U are formed, controlling the thyristors.

When the motor 1d reaches its current value of zero at the output of the conductivity sensor 22 of the converter v / an enable signal O is generated, which is fed to the input of the AND-24 logic node. At the output of the latter, the resolving voltage U Q is formed only in tow if its inputs simultaneously have The location of the enabling voltages (Uj Ui) f generated by the conductivity sensor 22 and the thyristor control current control unit 25 of the gate converter.

The change of the signals at the outputs of 10-12 logical switching 13 occurs in two stages. At the first stage, at output 12, a prohibitory signal occurs, the duration of which is determined by a given time delay t. At the second stage, the signals change at the outputs Forward 10 and Back 11.

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Thus, the introduction of a relay element with a hysteresis at the input of the logic switching unit eliminates accidental switching of the valve converter groups from the disturbance voltage at low levels of the control voltage and increases the stability of the drive operation. Introducing the current control unit into the power supply circuit of the phase-pulse control unit through the isolation valve allows monitoring the thyristor control current at each current consumption interval. The introduction of the NAND logic node, in which the logical multiplication of signals from the conductivity sensor and the current control block occurs, improves the speed and reliability of the conductivity control of the converter.

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Claims (1)

- REVERSIBLE VENTILY ELECTRIC DRIVE WITH A DC MOTOR, containing a reversed t-fae valve converter, the output of which is connected to the armature winding of the DC motor, and the control inputs are connected to the outputs of the phase-pulse control unit of the converter with the power supply connected to the first a voltage conversion unit, and the other three inputs are connected "respectively to the Forward, Backward outputs and the inhibiting output of a logical switching unit with two inputs, the regulator bores with two outputs, the first input of which is connected to the output of the speed sensor connected to the DC motor shaft, the second input is connected to the speed control unit, and the first output is connected to the first input of the voltage conversion unit, the other two inputs of which are connected to the Forward and Backward outputs logical switching unit, and the conductivity sensor of the valve converter, characterized in that, in order to increase reliability, it is additionally equipped with a relay element with hysteresis, a isolation valve, logically the AND-NOT node and the current control unit, while the input of the relay element with hysteresis is connected to the second output of the speed controller, and the output is connected to the first input of the logical switching unit, the second input of which is connected to the output of the AND-NOT logical node, the first input of the last connected to the output of the conductivity sensor of the valve converter, and the second input with the output of the control unit. current included through the isolation valve in the power circuit of the phase-pulse control unit of the converter. -SU, 1019569>