SU1332502A1 - Direct-current electric drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control the electric motors of vehicles. Improving the reliability and improving the dynamic performance is ensured by the introduction of the separation diode 8, additional resistors 17, 21. In this device, the duration of the on state of the thyristor 18 is not specifically adjusted in relation to the duration of the on state of the regulator 9. In brake mode, the field winding is connected additional resistor 21, which allows you to refuse to use the thyristor in the braking process. 1 pe. sl co

Description

The invention relates to electrical engineering and can be used in direct current traction electric drives.

The aim of the invention is to increase the reliability and improve the dynamic performance of the drive.

The drawing shows the scheme of the proposed electric drive.

The electric drive consists of a first contactor, connected in series, connected through a filter 1 to a power source, a first contactor smoothing throttle 3, pins 4 and 5, a reverser, windings 6 and excitation 7 of electric motors, a dividing diode 8 and a thyristor voltage regulator 9, To the output of which are connected the outputs of adjustable 10 and non-adjustable 11 braking resistors, the last of which is shunted by thyristor 12 and through the contact 13 of the second contactor is connected to the connection point of gliding drossel 3 and Ontact 2 of the first contactor, series-connected reverse diodes 14 and 15, to the junction point of which and another output of the adjustable brake resistor 10 are connected to a resist braking thyristor 16, a circuit from series-connected resistor 17 and the thyristor 18 to control the excitation current of the traction machines, which the diode 8 is connected to the windings 7 of the driving machines, shunted by a resistor 19 and through the contact 20 of the third contactor (instead of contact 20 you can use a thyristor, connected cathode associated with a diode 15 which is shunted by a resistor 21, a reverse diode 15, the cathode).

The drive works as follows.

In talk mode, pins 2 and 4 are closed, and pins 5, 13, and 20 are open. Using the thyristor regulator 9, the speed of the traction electric motors is started and controlled according to a predetermined algorithm, for example, by keeping the current Ta in the circuit of the Korean traction electric motors constant at a given level by adjusting the voltage and current of the excitation of the traction electric motors. Regulation of the excitation current of the traction electric motors is carried out

simultaneously with voltage regulation. To do this, the control unit (not shown) receives pulses at a given frequency simultaneously for turning on the thyristor controller 9 and T1 of the sensor 18. In this case, the excitation current varies not linearly as a function of filling the controller 9.

In the range A 0.1-0.8, the excitation current attenuation coefficient decreases slightly and current is maintained by varying the voltage. In the zone of change of A from 0.8 to 0, 1 basically the current 1d is maintained by changing the coefficient. With / 1, the adjustment process ends and the traction machines operate on a characteristic with

B

0

five

0

Where

L / 5 Ksh

 MdKc (blink unit) stops feeding

Rij, "and Rb + RW - resistance of resistors 17 and 19 connected in parallel, R J - resistance of windings 7

excitement. At the time of achieving eco

control pulses to the switching thyristors of the regulator 9 and it goes into operation with А 1 To ensure the operation of the regulator with А 1 (for example, to eliminate current surges in the machine circuit when the supply voltage changes), the switching capacitor of the regulator 9 is connected through section power source (not shown).

The proposed device allows

five

in the traction mode, realize traction forces close to the limiting ones, with extremely simple control of the thyristors used in the circuit. Actually, the voltage regulator 9 is controlled, the duration of the on state of the thyristor 18 is not specifically regulated with respect to the duration of the on state of the regulator 9, i.e. A combined method of controlling voltage and excitation current is implemented using a single controller.

In the brake mode, contacts 5, 1 3 and 20 are closed, and contacts 2 and 4 are open. A resistor 21 is additionally connected to the field winding, which allows for braking

Generation from high speeds in the operation of the regulator 9s A, 1 is the minimum required value, в „у„. In the process of braking, as the speed of traction machines decreases to meet condition 1 const with the aid of the control unit, the filling D of the controller 9 increases.

D the regulation of the voltage IQ of the supply thyristor voltage regulator and the magnitude of the coefficient / 5, since the excitation windings 7 apply a voltage only during periods of the conductive state of the regulator 9. Thus, during resistor deceleration, the current I,

connected to the circuit of the first and second contactors of the smoothing 15 drosellers connected in series with the connecting points of the winding, the coils of electric motors, in the circuit of which the contacts of the reverser are connected, and the resistors shunted by the resistor, the regulation thyristor

. | j is closed when the regulator 9 is connected across the circuit: winding 6, pin 5, excitation winding 7, isolation diode 8, voltage regulator 9, resistor 11, contact 13, exciter current 2o, whose anode is undercut 3, pin 5, winding korea 6, keys to the connection point of the first one — and when the regulator is turned off - along the following wires: winding korea 6, pin 5, contact 20, thyristor 16, resistor 10, resistor 11, contact 13, choke 3 , 25 are connected with the first output of the windings, contact 5, windings of korea 6 and winding, and other conclusions of the reverse wild 7 of excitation, brother diode 15, contact 20, winding 7 excitation. During regenerative braking at the output of the excitation windings with the contacts of the reverser, reverse diodes connected in series, the connection point of which is connected respectively with the positive terminal of the power supply and the second output of the excitation windings,

35

The key regulator 9 forms a ceso circuit from the series of connected coils: coil 6, pin 5, pin 20, reverse diode 14, power supply, resistor 11, pin 13, choke 3, pin 5, coil 6. In the brake mode the coefficient varies nonlinearly according to

with an expression

i

 + A R

a contactor

where R | y resistance included,, -i t-j /

in parallel resistors 19 and 21.

At the time of reaching the estimated speed of the traction machines, at which

braking of traction machines is realized. „„ ... neither dynamic indicators, he is sleep with 1 1, contact 20 is off- 45.

it is. This moment is recorded either by a signal from the speed sensor, or by the value of the filling D of the regulator 9. At L 1, the command from the control unit receives the command to turn on the thyristor 12, and effective braking continues until it stops. Connection via contact 20 of resistor 21 to windings

55

a thyristor of resistive braking, and an adjustable braking resistor, which is connected to the junction point of the return diodes and to the junction point of the cathode output of a T1 depistor voltage regulator and thyristor-shunted unregulated brake resistor, the other output of which is connected to another output of the contact

the contact of the first contactor is connected to the positive output of a power source characterized in that, in order to increase reliability and improve

excitation allows you to refuse to use the thyristor 18 in the braking process, which greatly simplifies the control algorithm and, as a result, increases the reliability

A coupling diode, additional resistors and a contactor connected between the second leads of the field windings and the thyristor voltage regulator, the contact of which is connected between the first terminal of the field windings and the junction point of the reverse diodes, one of the additional resistors connected in parallel with the reverse diode associated with the field windings traction machines, and another additional resistor is connected by one of the leads to the cathode of the thyristor of the current control - exciter332502

operation of the device while maintaining the namic indicators of the car.

Claims (1)

Invention Formula A DC motor containing a cathode-connected output with a minus output of the source power thyristor controller eg connected to the circuit of the smoothing throttle connectors connected to the junction point of the first and second contactors, Korean motor windings, in the circuit of which the contacts of the reverser are connected, and the resistor shunting by the resistor, and the regulation thyristor excitation current, the anode of which connects to the first wiring connection point is connected to the first output of the excitation windings, other outputs of the return excitation voltage, the anode of which connects to the connection point of the first wound is connected to the first output of the excitation windings, other the inverse of the divider windings of the excitation windings with contacts of the reverser, the inverse diodes connected in series, the connection point of the excitation flow, the anode of which connects to the first end connection point with the first output of the windings of the excitation, conclusions inverse di Odes are connected respectively with the positive terminal of the power source and the second terminal of the field windings, a chain of series connected a thyristor of resistive braking, and an adjustable braking resistor, which is connected to the junction point of the return diodes and to the junction point of the cathode output T1 of the pistor voltage regulator and the thyristor-shunted unregulated braking resistor, the other output of which is connected to another contact of the contact,, The contact of the first contactor with the positive output of the source is characterized by the aim of increasing the reliability and neither the dynamic performance, nor the sleep. A coupling diode, additional resistors and a contactor connected between the second leads of the field windings and the thyristor voltage regulator, the contact of which is connected between the first terminal of the field windings and the junction point of the reverse diodes, one of the additional resistors connected in parallel with the reverse diode associated with the field windings traction machines, and another additional resistor is connected by one of the leads to the cathode of the thyristor of current control - excitation 1332502 traction machines, and others, for example, and the thyristor controller, for example, the junction point of the separation unit.