RU86924U1 - RESERVED SYSTEM FOR CONTROL OF THE MOTOR ELECTRIC MOTOR DRIVE - Google Patents

Abstract

A redundant system for controlling an electric motor of an arrow electric drive, containing three channels of a computing device, a major element “2 of 3”, the output of which is connected to the input of the commutator voltage of the electric motor, in series with which the electric motor is switched on, characterized in that three pulse transformers are inserted into it, three diode, three capacitors and three relays, the output of the first channel of the computing device is connected to the primary winding of the first pulse transformer, in series with the secondary winding of which the first diode and the first relay are connected, the first capacitor is connected in parallel with the winding of the second channel of the computing device connected to the primary winding of the second pulse transformer, the second diode and the second relay are connected in series with the secondary winding of which the second capacitor is connected in parallel, the output of the third channel of the computing device is connected to the primary winding of the third pulse transformer, in series with the secondary winding of the cat cerned included a third diode and a third relay, parallel windings of which includes a third capacitor, and closing contacts of the first, second and third relays are connected to the inputs of the majority element "2 3".

Description

Redundant system for controlling the electric motor of the switch electric drive

The utility model relates to railway transport and can be used in systems of electrical centralization of arrows and traffic lights for controlling electric motors of switch electric drives.

Known redundant system for turning on / off the electric motor, containing three channels of the computing device, the outputs of which are connected to the corresponding inputs of two major elements "2 of 3", the outputs of which are connected to the inputs of the respective commutators of the power supply voltage of the motor, in series with which the motor is turned on (Shevkoplyas B. B. Microprocessor structures. Engineering solutions. - M.: Radio and communications, 1993, p. 47, Fig. 2.2).

This redundant system for turning on / off the motor has two drawbacks. Firstly, it is unnecessarily complicated, as it includes two majority elements and two amplifiers. Secondly, it allows the false inclusion of an electric motor in case of malfunctions of the channels of the computing device.

Closest to the technical nature of the claimed redundant system for controlling an electric motor of an arrow electric drive is a redundant system for turning on / off the electric motor, containing three channels of a computing device, the outputs of which are connected to the inputs of the majority element "2 of 3", the output of which is connected to the input of the supply voltage switch an electric motor in series with which the electric motor is turned on (Shevkoplyas B.V. Microprocessor structures. Engineering solutions. - M.: Radio and communications, 1993, p. 47, fig. 2.1).

The disadvantage of this system is its low reliability, since it does not exclude the false inclusion of an electric motor in the event of a malfunction of the channels of the computing device.

For example, if one of the channels of the computing device fails, due to which a potential corresponding to the “logical 1” signal will be present at its output, and if there is a command to turn on the electric motor in the form of a “logical 1” signal at the output of only one of the other two channels, the majority the element will record the receipt from the two channels of the computing device of identical commands to turn on the electric motor, after which the commutator of the electric motor supply voltage will turn on the electric motor. Such an event is not permissible in the systems of electrical centralization of arrows and traffic lights that perform critical functions for controlling the movement of trains.

The objective of the utility model is to increase the reliability of the redundant system for controlling the electric motor of the switch electric drive by monitoring the health of the channels of the computing device.

The technical result is achieved by the fact that in the redundant system for controlling the electric motor of the switch electric drive, containing three channels of the computing device, the majority element is “2 of 3”, the output of which is connected to the input of the commutator voltage of the electric motor, in series with which the electric motor is switched on, three pulse transformers are introduced, three diodes, three capacitors and three relays, the output of the first channel of the computing device is connected to the primary winding of the first pulse transformer a, in series with the secondary winding of which the first diode and the first relay are connected, in parallel with the first capacitor, the output of the second channel of the computing device is connected to the primary winding of the second pulse transformer, in series with the secondary winding of which the second diode and the second relay are connected, the winding of which is connected in parallel second capacitor, the output of the third channel of the computing device is connected to the primary winding of the third pulse transformer, in series with the second the primary winding of which includes the third diode and the third relay, parallel to the winding of which the third capacitor is connected, and the make contacts of the first, second and third relays are connected to the inputs of the majority element “2 of 3”.

Figure 1 shows a diagram of a redundant system for controlling an electric motor arrow switch. Figure 2 shows the scheme of the majority element and the switch.

The redundant system for controlling the electric motor of the arrow electric drive includes a computing device 1, which includes the first 2, second 3, third 4 channels, a major element "2 of 3" 5, the output of which is connected to the input of the switch 6 of the power supply of the electric motor, in series with which the electric motor is turned on 7 switch electric drives, first 8, second 9, third 10 pulse transformers, first 11, second 12, third 13 diodes, first 14, second 15, third 16 capacitors, first 17, second 18, third 19 relays. The output of the first channel 2 of computing device 1 is connected to the primary winding of the first pulse transformer 8, the first diode 11 and the first relay 17 are connected in series with the secondary winding of which the first capacitor 14 is connected in parallel. The output of the second channel 3 of computing device 2 is connected to the primary winding of the second pulse transformer 9, in series with the secondary winding of which a second diode 12 and a second relay 18 are connected, in parallel with the winding of which a second capacitor 15 is connected. Output third channel 4 of the computing device 1 is connected to the primary winding of the third pulse transformer 10, in series with the secondary winding of which the third diode 13 and the third relay 19 are connected, in parallel with the winding of which the third capacitor 16 is connected. Contacts 17.1 of the first, 18.1 of the second and 19.1 of the third relay are connected to the inputs majority element “2 of 3” 5.

As a computing device that includes three channels, the computing core of microprocessor centralization of arrows and signals of the EC-EM can be used, which includes three computing channels VK ₁ VK ₂ , VK ₃ (Microprocessor-based centralization: Textbook for technical schools and colleges of railway transport / Vl.V. Sapozhnikov et al .; Edited by Vl.V. Sapozhnikov. - M .: State Educational Institution “Educational and Methodological Center for Education in Railway Transport”, 2008, p. 314, Fig. 7.1).

The proposed options for the majority element "2 of 3" and the switch are shown in figure 2.

The majority element "2 of 3" is made on the transistor 20, diodes 21-26 and resistors 27-29. (RU 52286, publ. 2006.03.10). Its power is supplied from the first direct current source 32 (Uп1). The operation of this majority element “2 of 3” is illustrated by the following table.

No. p / p Input Signals Signal on
output 17.1 18.1 19.1 0 0 0 0 one one 0 0 one one 2 0 one 0 one 3 0 one one 0 four one 0 0 one 5 one 0 one 0 6 one one 0 0 7 one one one 0

The collector of the transistor 20 is the output of the majority element "2 of 3" 5, which is connected to the input of the switch 6.

The switch is made on relay 30 type "REL-1600" (See. Soroko V.I., Rosenberg E.N. Equipment for railway automation and telemechanics: Reference: in 2kn. Book 2. - 3rd ed. - M .: NPF PLANETA, 2000, p. 262, table 89). In parallel with the coil of relay 30, a rectifier diode 31 is connected, which shunts the self-induction EMF that occurs when the relay 30 of switch 6 is turned off, which without this switch could damage the transistor 20 of the majority element 5. The input of the switch - the coil of relay 30, is connected in series with the output of the majority element 2 of 3 ”5 and the first power supply 32 (Uп1). The closing contact 33 of the relay 30, connected in series with the voltage source of the electric motor 34 (Uп2), turns the electric motor 7 on and off.

A redundant system for controlling an electric motor of an arrow electric drive operates as follows. In the absence of commands to turn on the electric motor 7 of the arrow electric drive, the outputs of the channels 2, 3 and 4 of the computing device 1 present either a constant potential — a signal “logical 1” or “logical 0”, or there are no signals due to the channel outputs being in a high impedance state. Capacitors 14, 15 and 16 are discharged, relays 17, 18 and 19 are turned off, and their contacts, respectively 17.1, 18.1 and 19.1, are open. There are no signals at the inputs of the majority element “2 of 3”, transistor 20 is closed (see table), relay 30 of switch 6 is off, its contact 33 is open, electric motor 7 of switch electric drive is off.

If necessary, turn on the electric motor 7 of the arrow electric drive at the outputs of all three channels 2, 3 and 4 of the computing device 1, synchronously generated DC pulses (see figure 1). Passing along the primary windings of pulse transformers 11, 12 and 13, these pulses induce EMF in their secondary windings. These EMF rectifier diodes 11, 12 and 13 are converted into a DC voltage, which charges the capacitors 14, 15 and 16, respectively. After 6-8 pulses in each command to turn on the electric motor 7 of the arrow electric drive, capacitors 14, 15 and 16 accumulate enough energy to turn on the relays 17, 18 and 19, respectively. Relays 17, 18 and 19 attract their anchors, closing contacts 17.1, 18.1 and 19.1, respectively. In this case, all 3 inputs of the majority element "2 of 3" 5 from the first power source 32 receives a high potential corresponding to the signal "logical 1". The transistor 20 of this element opens (see table), the relay 30 of the switch is turned on, its contact 33 is closed, the electric motor 7 of the switch actuator is turned on. The turn-off of the electric motor 7 of the switch actuator occurs after the termination of the commands to turn it on at the outputs of two or three channels of the computing device 1 after the discharge of the capacitors 14, 15 and 16. In the event of a malfunction of one of the channels of the computing device 1, the redundant system for controlling the electric motor of the switch electric drive works similarly.

Since in the inventive redundant system for controlling the electric motor of the switch between channels 2, 3 and 4 of the computing device 1 and the majority element 5 there is a galvanic isolation, organized by switching on pulse transformers 8, 9 and 10, and the commands to turn on the electric motor 7 of the switch electric drive are a series of pulses, then the malfunction of the channels of the computing device 1 in the form of a potential of 0 or 1 will not lead to the inclusion of an electric motor 7 of a pointer electric drive.

Claims (1)

A redundant system for controlling an electric motor of an arrow electric drive, containing three channels of a computing device, a major element “2 of 3”, the output of which is connected to the input of the commutator voltage of the electric motor, in series with which the electric motor is switched on, characterized in that three pulse transformers are inserted into it, three diode, three capacitors and three relays, the output of the first channel of the computing device is connected to the primary winding of the first pulse transformer, in series with the secondary winding of which the first diode and the first relay are connected, the first capacitor is connected in parallel with the winding of the second channel of the computing device connected to the primary winding of the second pulse transformer, the second diode and the second relay are connected in series with the secondary winding of which the second capacitor is connected in parallel, the output of the third channel of the computing device is connected to the primary winding of the third pulse transformer, in series with the secondary winding of the cat cerned included a third diode and a third relay, parallel windings of which includes a third capacitor, and closing contacts of the first, second and third relays are connected to the inputs of the majority element "2 3".