SU1294657A1 - Device for controlling twin-motor direct current traction drive of vehicle - Google Patents

Abstract

The invention relates to a device for controlling a twin-engine traction drive of a direct current of a vehicle and allows an increase in the accuracy of control during the entire working cycle of the drive consisting of acceleration modes. W movement and braking. The device contains regulators 1, 2, 7, 8 currents of the excitation windings and motor cores, a master oscillator 21 connected to one of the inputs of the prohibition unit 18, and a motion direction adjuster 20 connected to the input of the comparator 19, the output of which is connected to another input of the unit 18 prohibition, while the outputs of prohibition unit 18 and comparator 19 are connected to the inputs of the corresponding regulators 1, 7, 8, 2. The device contains a time selector 16, which switches depending on the shape of the output voltage of the regulators 7, 8 voltage and current korea outlet The signal of the difference current source separation unit 24 to the inputs of the regulators 7, 8 or to the inputs of the regulators 1, 2 of the excitation currents to correct the control signals and equalize the current loads on the motors. 1 h. n. f-ly, 3 ill. (L with N5 CO Ni: 05 CL Figure 1

Description

The invention relates to converter technology and may find application in the impulse control of direct current motors in the transport, electrical and other industries.

The purpose of the invention is to improve the accuracy of regulation.

FIG. 1 is a functional block diagram of the proposed device; in fig. 2-- block diagram of the voltage and current regulator; in fig. 3 is a block diagram of an amplitude selector and excitation current controller.

The device contains regulators 1 and 2 currents of independent windings 3 and 4 excitation of engines, the power supply circuit of which includes impulse converters 5 and 6 and regulators 7 and 8 currents of Korean 9 and 10, the power supply circuit of which includes impulse converters 11 and 12. Sensors The 13 and 14 currents of the field windings are connected to one of the inputs of the regulators 1 and 2, the other inputs of which are connected respectively to the outputs of the analog key element 15 of the time selector 16, the output of the amplitude selector 17, the output of the inhibitor block 18 and the output of the comparator 19, the input which is connected to the output of the driving direction setting unit 20, and the input of the prohibition unit 18 is connected to the output of the generator 21 and the mules.

The TOKOEJ sensors 22 and 23 of Korea are connected to the inputs of the amplitude selector 17, the difference separation unit 24 and one of the inputs of the Korean current regulators 7 and .8, the other inputs of which are connected respectively to the driving direction adjuster 20, the comparator 19, the output of the prohibition block 18, the outputs time selector 16.

The time selector 16 also contains the element OR 25 and the trigger 26, the output of which is connected to the input elements 27 and 28 of the analog key element and the input elements with contacts 29--32.

Regulators 7 and 8 currents in korea contain a converter 33, the output of which is connected to one of the inputs of the comparator 34 connected by another input to the output of the adder 35, and the output to one of the inputs of the inhibitor block 36, the other input of which is connected to the output of the comparator 37, connected to one of the inputs of the element 38, the other input of which is connected to the output of the comparator 39, connected to the inputs of the output of the adder 40 and the waiting generator 41. Regulators 7 and 8 also contain the element OR 42, trigger 43 and the one-channel 44.

The amplitude selector 17 is provided on the maximum current selection unit 45, the converter 46, the comparator 47 and the adder 48, and the regulators 1 and 2 of the excitation windings contain an adder 49, the output of which is connected to one of the inputs

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the comparator 50, the output of which is connected to one of the inputs of the element OR 51, the other input of which is connected to the output of the comparator 52, and the output to one of the inputs of the trigger 53, the other input of which is connected to the output of the one-shot 54.

The device works as follows.

The generator 21 generates clock pulses determining the period of the pulse width modulation of the pulse converters 5, 11, 12, and 6. The leading edge of the pulse prepares the triggers 43 and 53 in the regulators 7 and. 1, as well as similar triggers in regulators 8 and 2. In the interval, while the control voltage corresponding to the engine acceleration mode is less than the threshold voltage of the comparator 37, the comparator 37 issues a inhibitory signal to the interdiction unit 36 and the enabling signal element 38. At the moment when the voltage reaches the required level, the comparator 19 operates and removes the inhibit signal from the prohibition unit 18, preventing the passage of clock pulses to start the generator 41 and the one-shot 44 in the regulator 7n similar circuits in the controller 8 as well e to the element OR 5 and the launch of the one-shot 54 in the controller 1 and similar elements in the controller 2. The clock pulse arrives at the input of the trigger 26, setting it to the zero state. The control voltage goes to the adders 35 and 40 of the regulator 7, similarly to the regulator 8, as well as to the comparator 47 amp; 1 wise selector 17, however, in the regulators 1 and 2 of the motor mode - the signal is not received.

Trigger 43 and 53 on Adjustable 7 and 1. As well as similar triggers on Regulators 8 and 2, they give out signals to close the key elements to impulse converters 5, 6, 11 and 12, 3 core circuits and excitement of the motor, the currents begin to flow, which are registered by the sensors 13, 14, 22 and 23. At the output of the differential difference isolation unit 24, there is a difference in the core currents and through the key element 15 enters the adders of the regulators 7 and 8. In one of the adders this difference is subtracted from the control voltage, and in another, it adds to it. Thus, the triggering times of the comparators, resetting the triggers and switching off the key elements of the pulse converters U and 12 are different. These moments coincide when the difference output signal of the difference separator 24 becomes equal to zero in terms of static error. In this case, the maximum value of the short-circuit current is limited by the switching capacity of the converter. In motor mode, the excitation current to each motor is formed proportional to the maximum instantaneous value of Korean currents. Comparator 50 compares the output signal

The adder 49 with the signal from the sensor 13. In this case, the trigger 58 affects the switching off of the pulse converter 5. When the signal from the sensor 13 reaches the trigger threshold of the comparator 52, the trigger 53 switches, thereby limiting the maximum excitation current. Similarly, switching of the excitation current in the pulse converter 6 occurs.

When the signal from the output of the adder 40 is larger than the sawtooth voltage from the output of the generator 41, and also when the signal from the 22 core current sensor does not reach the threshold of the comparator 55, the engine runs on a natural characteristic. In the same interval, the operating conditions of the second motor are different from the first one and only the current is switched by means of the regulator 8. Trigger 26 is switched to equalize the thrust loads with the arrival of the clock pulse. and to the similar regulator adder 2. Thus, in the motor mode, if the conditions of the leveling of the crust currents are not fulfilled, the leveling of the currents by adjusting excitation currents. The excitation current of the more stressed motor increases, and the excitation current of the less loaded motor decreases until the difference output signal of the difference separator 24 becomes equal to zero within the static error.

The signal from the output of the element OR 25 is interrupted with the subsequent arrival of the clock pulse from the generator 21, the trigger 26 switches the differential output signal from the block 24 from the inputs of the regulators 1 and 2 to the inputs of the regulators 7 and 8, the main currents of the engines decrease by circulating in the circuits the idle speed of the converters, the voltage from the output of the setting device 20 becomes below the threshold of the comparator 19 and the flow of clock pulses to the regulators 1, 2, 7 and 8 and the trigger 26 is prohibited by the block 18. To change to the braking mode, the sign voltage of the setting device is changed 20. Comparators 37 and 47 operate.

In the deceleration mode at the moment of time, a clock pulse from the output of the generator 21 triggers one-shot in regulators 1, 2, 7 and 8. In this case, in the pulse converters 11 and 12, the current flow paths of the Korean currents of the other direction are formed, and the excitation currents in the pulse converters 5 and 6 maintain the same direction. The differential output of block 24 changes sign compared to the previous interval, since sensors 22 and 23 have a bipolar output signal. The differential signal through the key element 15 is fed to the adders 35 and 40 of the regulator 7 and the same adders of the regulator 8. The equalization of the crust currents is carried out by the regulators 7 and 8, while the maximum level of the braking current is limited at the time of the comparator 55 in the regulator 7 or an analogous comparator in the regulator 8. When the braking cortex currents are equalized, the excitation currents are thus kept constant to maintain a constant braking torque.

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Claims (2)

1. A device for controlling a two-engine traction drive of a vehicle's current, containing current controllers of independent motor excitation windings, one of the inputs of which is connected to sensors of the excitation windings, and each output to the input of a pulse converter in the winding power supply circuit excitation of the corresponding motor, the current regulators of Korea, one of the inputs of which are connected to the sensors of the currents of Korea, connected to the inputs of the difference difference block, and the output of each is connected to the input of a pulse The converter in the power supply circuit, the control unit of the direction of motion, the amplitude selector, characterized in that, in order to increase the control accuracy, it is equipped with a prohibition unit connected to its inputs by a pulse generator, a comparator and a time selector, the first and second from the inputs of which are connected to the outputs of the difference elimination unit, the third, fourth and fifth, respectively, with the outputs of the current regulators core and the output of the prohibition element, and the corresponding outputs connected to the first inputs of the current regulators core 0 and the second inputs of the field current regulators, the third inputs of which and the second inputs of the core current regulators are connected to the output of the inhibit element, and the fourth inputs of the field current regulators and the third inputs of the current regulators are connected to the comparator output, while the output of the mode setter is connected to the fourth inputs of the current regulators core and the first input of the amplitude selector, the second and third inputs of which are connected to the outputs of the current sensors of the core, and the output with the fifth inputs of the field current regulators. 2. The device according to claim 1, characterized in that the time selector is made on the OR element, the trigger and one of the inputs connected to its output by an analog key element, the other inputs of which are the first and second inputs of the time selector, and the outputs exits of the temporary selector. five 0 five