SU1288875A1 - Multimotor electric drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used in electric rolling stock with traction motors. The purpose — improving braking efficiency — is provided by introducing into the device a series-connected master oscillator 12 and a control delay line 13, as well as a braking control unit 14, the input of the master oscillator 12 being connected to the control controller 24, and the outputs to the control input thyristor converter 5 and to the fourth input of the block 14 of the control process braking. The output of the controlled delay line 13 is connected to the thyristor control input (L Itc 00

Description

the converter 5, and the inputs of the converter with the setting device 26 and the sensor 27 of the excitation current, with the sensor 28 of the current of the core and with the discrete setting device 23 of the braking current. The outputs of the braking process control unit 14 are connected to the inputs of the power controller control unit 11, with the setting unit

The invention relates to electrical equipment and can be used in electric rolling stock by traction engines.

The aim of the invention is to increase the braking efficiency.

The drawing shows the proposed drive.

The multi-motor electric drive contains electric motors 1-4, a thyristor converter 5 connected to the core windings of electric motors 1-4, with the excitation windings 6-9 of electric motors 1-4 connected through a converter 5 to the power source, a variable braking resistor 10 of the power controller with a block 11 control included in the main windings of electric motors 1-4. In addition, the electric drive contains a series-connected master oscillator 12 and a controllable delay line 13, a braking process control unit 14 containing three channels, each of which is composed of two circuits including respectively sequentially connected oscillators 15 and 16 of the sawtooth voltage , comparators 17, 18 and differentiating links 19 and 20, the outputs of which through the circuit 21 are connected to the windings

relay 22. I

 The second inputs of the first comparators 17 of the three channels are combined and are the first input of block 14, the second inputs of the second comparators 18 of the first and second channels are combined and are the second input of block 14, the second input of the second comparator 18 of the third channel is the third

23 of the braking current core, with the field current setting unit 26, the second input of which is connected to the second input of the braking process control unit 14, the third and first inputs of which are connected respectively to the current and excitation current 28, 27. 1 il.

five

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five

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five

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the input of the block 14, the inputs of the generators 15 and 16 of the sawtooth voltage are combined to form the fourth input of the block 14, the brake current regulator 23 of the core is made discrete, and the main windings of electric motors 1-4 are connected in series, the input of the master oscillator 12 is connected to the controller 24, and the outputs - to the control input of the thyristor converter 5 and to the fourth input of the braking process control unit 14.

 the controllable delay line 13 is connected to the control input of the thyristor converter 5, and the inputs through two closures of the contact 25 of the relay 22 of the third channel of the braking control unit 14 are connected to the first output of the setpoint 26 and the sensor 27 of the excitation current, and through the breaking contacts of the specified relay 22 — with the core current sensor 28, directly and through pin 29 of the controller 27 of the controller — with a discrete setting device 23 of the braking current. The outputs of the braking process control unit 14 are connected to the inputs of the control unit 11 by the power controller, to the brake current setpoint master 23, to the field current setting unit 26, the second output of which is connected to the second input of the braking control unit 14 via the second contact 30 of the control controller 24 -. ki, the third and first inputs of which are connected respectively to the sensors 28 and 27 of the current of the core and excitation.

The armature windings of electric motors 1-4 are connected to the power source 6 via contacts 31, 32 and diode 33 Contact 32 is bridged by a resistor 34. Accelerating relay (deceleration) relay 35 is connected in series with the main windings of electric motors 1-4. The control circuit is connected to the controller .24 .

The drive works as follows.

The controller 24 controls the setting. At a decrease in speed, to is determined in the braking position, while in block 14 the voltage is applied

and

, VOLUME 1L

from setpoint 26 and connect

sensor outputs 27 and 28 are read.

In the first braking section, in the range of electric train speeds of 100-60 km / g, the braking current is controlled by varying the excitation current of the traction electric motors 1-4, taking into account the co-mutation limitation. As the speed decreases, along with an increase in the excitation current, the braking current settings increase. The regulation of the braking current settings is carried out using block 14. All three channels of block 14 work in the same way. In the first braking section in the range of 100-60 km / g, the excitation current increases, for example, from 40 to 80 A. A signal proportional to .... It is set by the generator 26 of the excitation current to the comparators 18, where it is compared with the sawtooth voltage of the generator 16. At the output of the comparator 18 there is a U-shaped pulse, the duration of which is proportional to the level of comparison of these two voltages. The U-shaped pulse is differentiated, and the allocated back front of the pulse arrives at the input of the AND 21 circuit. In the event that impulses from the differentiating links arrive simultaneously at the AND 21 circuit. If 19 and 20, then the output of the circuit 21 and Vits impulse will trigger the relay 22, which will change the braking current setting in the setting unit 23 from 120 to 140 A. With its blocking contacts, the second channel works in the same way. In the third canape, the equality of the currents of the core and excitation is fixed, i.e. determines the moment the system goes to full excitement. At this moment, the relay of the third channel 22 is triggered, which disconnects the current sensor 28 from the input of the controlled delay line 13, connects the excitation current sensor 27 to the input

and gives permission in control block 11 to operate the power controller. Further maintenance of the average value of the braking current is achieved by removing the starting and braking resistor steps under the control of the acceleration (deceleration) relay 35. At the same time, the excitation current remains unchanged and equal, for example, 18.0 A.

the new value of the system goes into resilient braking mode with independent excitation of traction engines; In an emergency mode, in the process of electric braking, the high-speed contact 32 is switched off, the resistor 34 is inserted into the braking current circuit

Claims (1)

Invention Formula A multi-motor electric drive containing electric motors, a thyristor converter connected to the main windings of electric motors, and the excitation windings of electric motors through the specified converter are connected to a power source 30 20 40 controller, a control controller with contacts, a brake current setpoint box and a field current setting unit, a variable braking resistor of a power controller with a control unit included in the main windings electric motors, which are used in order to increase the braking efficiency, in addition to it are connected in series the master oscillator and control of the delay line, the braking process control unit containing three channels, each composed of two circuits, including a series-connected saw-tooth voltage generator, a compiler and a differentiating link, the outputs of which are connected to the relay winding through the AND circuit, the second inputs of the first comparators of the three channels are combined and are The first input of the block, the second inputs of the first and second channels second comparators are combined and are the second input of the block, the second input of the second comparator of the third channel is the third input of the block, the inputs of the sawtooth generators 51288875 the first input of the block, the gate of the core and the coil windings are connected after the input of the driver that sets the controller to the controller; the input of the thyristor converter and the fourth input of the braking process control unit, the output of the controlled delay line is connected to the control input of the thyristor converter, and the inputs are connected via the second relay contact of the third canal of the brake process control unit to the first output sensors of the current core and exciter - sensor and sensor of the excitation current, neither. Editor N.Egorova Compiled by M.Kr Khtunova Tehred A. Kravchuk Proofreader G. Reshetnik Order 7822/56 Circulation 683. Subscription VNIIPI USSR State Committee for Inventions and Discoveries 4/5, Moscow, Zh-35, Raushsk nab. 113035 Production and printing company, Uzhgorod, st. Design, 4. And through the breaking contacts of the specified relay with the current sensor core directly and through the contact of the control controller with a discrete brake current setting unit, the outputs of the braking process control unit are connected to the inputs of the control unit of the power controller, with the brake current setting unit of the main current, the second output which, through the second contact of the control controller, is connected to the second input of the braking process control unit, the third and first inputs of which