SU1224192A1 - Device for controlling line-fed traction motor of railway transport bogies - Google Patents

Description

The invention relates to a traction electric drive with linear motors with stationary mounted inductors on a rail track and can be used for devices of intra factory and intra shop transport in the metallurgical and other industries.

A device for controlling a linear traction motor t & rail rail transport is known, which contains nude sensors included in the threading values of relays, a coupling machine, one of which is connected to the power supply circuit of all inductors, and other switching units in each inductor circuit.

A disadvantage of the known device is the dependence of the number of control system apparatus on the number of linear inductors of the traction drive. The number of intermediate relays in the prototype is equal to the number of individual switching devices (the number of linear inductors), and when using contactless track sensors for controlling the position of the core plates, the circuit becomes even more complicated, since an amplifier is required for each track sensor.

The purpose of the invention is to increase the reliability of the device.

The goal is achieved by the fact that a device for controlling a linear traction motor of rail transport carriages, comprising track sensors included in the power supply circuit of the relay, which connects devices, one of which is included in the power supply circuit of all inductors, and the other co-muting devices - in the circuit of each inductor, equipped with a controlled pulse generator, a ring switch with an output relay, a unit for generating a motor current error signal with a setpoint with an output rala, the contact of which is included in the power supply circuit An impulse generator connected by an output to a control input of a ring switch, the track sensors and inductors are combined into groups, the sensors and inductors of each of which are respectively connected to the power supply circuit of the corresponding relay and connected to the corresponding output relay contact of the ring switch.

FIG. 1 is a block diagram of the proposed device; in fig. 2 is a circuit diagram for switching a ring switch and a pulse generator.

The device contains travel sensors with induction type 1 coils, which are connected via diodes 2 and amplifiers 3 to output relay 4 with contacts 4.1, 4.2, relay 5 with contacts 5., 5.2, relay 6 with contacts 6.1, 6.2.

Inductors 7-1-7.P asynchronous linear traction motors are combined into groups and through a switching device 8. - 8.P - with contacts 9.1-9. P are connected to the ring switch I) through it

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output relays And with contacts 11.1 -11.4 relays 12 with contacts 12.1 -12.4, relays 13 with contacts 13.1 -13.4. The control input of the ring switch 10 is connected to the output of the pulse generator 14, the power supply of which is connected to the output relay 15 with contact 15.1 of the motor current error-response signal generating unit 16 with the setpoint. The device contains a relay 17 with a contact 17L, which bypasses the button 18, the switching device 19 in the supply circuit of all inductors 7.1-7.p.

The pulse generator 14 is built on a time relay 20 with contact 20.1 and a relay 21 with contact 21.1 pulse-pair. Relay 22 is its output relay.

Ring switch 10 contains a ring circuit on relay 23 with contacts 23.4, relay 24 with contacts 24.1-24.4, relay 25 with contacts 25.1-25.4, and output relays 1, 12, and 13. Diodes 26 serve to isolate control circuits of the cells of the ring switch. The device contains a button 27.

The device works as follows.

In the initial state, the power supply of inductors 7.1–7. P is switched off by the switching apparatus 19, the relay 17 is turned off, and its contact 17.1 is open.

When the power is turned on by switching on the common switching device 19, the relay 28 for monitoring the voltage opens its contact 28.1, and the power supply relay 29 is also open, since the inductors are not yet turned on and the contact 15.1 in the power supply circuit of the pulse generator is closed.

When the button 18 is pressed, the relay 17 is turned on, which by its contact 17.1 bypasses the button. Before the inductors are turned on by the contactors 8.1-8. The contact 29.1 of the current relay must remain open and the pulse generator will turn on. Regardless, one of the relays 23, 24 and 25 of the ring switch 10 is turned on, which causes the corresponding output relays P, 12 and 13 to turn on. It may turn out to be relay 2 or 13 and inductor 7.1 by contactor 8.1 does not turn on. After the arrival of the first pulse from the generator 14 in the ring switch 10, the relay switches in the sequence 23-24, 24-25, or 25-23, which causes the second output relay to turn on. After this, let the output relays 12 and 13 of the ring switch be turned on, which also does not cause the inductor 7.1 to be turned on by the contactor 8.1, and the other inductor cannot be switched on by its contactors due to interlocking of the contactors by their block contacts.

In this case, the second control pulse of the generator 14 causes the output relay 12 to turn off and the output relay 11 to turn on, after while pressing the button 18

contactor 8.1 turns on inductor 7.1. At the same time, the block-contact 9.1 of this counterstar, by closing, shunts the contact of button 18 in the circuit including the coils 8.1, and the other block-contact 9.2, closing, prepares the coil turning-on circuit 8.2 to turn on when the output relay 13 is turned off and the relay is turned on 12.

Later on, when the ring switch is operated, the terminal 8.1 of the inductor 7.1 switches off and the inductor 7.3 switches on by the contactor 8.3.

If the position of the carriage coincides with the inductors 7.1, 7.2 and the main plates of the linear motor installed under the carriage completely overlap these inductors along the length, then after the inductors are turned on in the manner described, their total current exceeds the current setting of the relay 29 and it closes its contact in the relay circuit 28, causing the pulse generator to turn off by contactor 4.1 relay 4.

Included inductors 7.1 and 7.2 create tractive force and set the cart in motion.

The dimensions of the two core plates installed under the bogie and the installation pitch on the inductor rail are chosen so that when the bogie moves and the track sensors interact with the core plates, the single signals generated by the track sensors and the paired (coincident signals of the two sensors) alternate. The inductors are switched only with paired signals; for this, the contacts of the output relays 4, 5 and 6 of the track sensors are connected two in series in three combinations. The paired signals of the track sensors (simultaneously closing the contacts of two output relays) are fed to the input of the ring switch, causing it to work, as in the control of the pulse generator signals.

If, when turned on, the position of the carts does not coincide with the first inductors, then the switching of their power supply according to the signals of the pulse generator occurs before the combination of the inductors connected to the carriage, after which the switch to control

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Cheii.M inductors for control by signals of traveling sensors. In the absence of a cart, the control of switching inductors by the signals of the pulse generators 14 makes it possible to carry out a check of the inductors' health and control circuitry. In the absence of inductors of the core plates, the windings of the inductors flow around the idling current, the sum of which for the two inductors is less than the current setting of the relay 29 and its contact 29.1 in the relay circuit 28 is open, and contact 15.1 in the pulse generator circuit 14 is closed, which ensures switching control by the generator signals 14 pulses.

The electric braking of the carts can be performed by countering, electrodynamic and generator method with recovery (when powered by a lower frequency current). After the trolley is stopped, the power is turned off by the common switching device 19. At the same time, the power supply circuit of the generator 14 is opened, ensuring the state of the ring switch 10 and the contactors 8.1-8 p (the stopping point is memorized). When it is turned on again, if the cart is not “ravaged,” relay 29 closes its contact 29.1 in relay circuit 28 and the latter blocks the operation of generator 14 by opening its supply circuit with its contact 15.1.

It is envisaged to turn off the power supply of the inductors by the contactors 8.1-8. With incomplete overlapping of these inductors by the core plate, which means reducing the magnitude of the switched current and reducing the wear of the contacts of the switching devices. Arcing-free switching is also possible if you select a common switching device 19 in a semiconductor design and for the switching time of the contactors 8.1 - 8P, turn off the power supply by the switching device 19.

The technical efficiency of using the proposed device is determined by the exclusion of switching devices for switching on and off each inductor, the possibility of proactively monitoring the operation of the drive inductors and switching devices by successive switching through signals from a pulse generator simulating signals from track sensors.

Claims (2)

DEVICE FOR CONTROL OF LINEAR TRACTION MOTOR- LEM OF A RAIL TRANSPORT CARS containing track sensors with relays at the output, switching devices, one of which is included in the power supply circuit of all inductors, and other switching devices - in the circuit of each inductor, characterized in that, in order to increase reliability, it is equipped with a controlled generator pulses, a ring switch with an output relay, a unit for generating a signal of a mismatch of the motor currents, with a set point with an output relay, the contact of which is included in the power circuit of the pulse generator connected to the output by the control the main input of the ring switch, to which the output relays of the track sensors are connected, while the track sensors and inductors of each of which are respectively connected to the power supply circuit of the corresponding relay and connected to the corresponding contact of the output relay of the ring switch. 0 - th F I I I II --- έ-0- —I —CHN, -ί I I „a n R I, 1 l Sh-Oh. 2 g. SU ₀₁₎ 1224192>