SU989725A1 - Device for regulating traction motor speed - Google Patents

Description

The invention relates to devices for controlling the rotation speed of a traction electric motor and can be used to stabilize the speed of movement and improve the anti-slip and anti-slip properties of a traction electric drive.

A device for regulating the speed of an electric motor, comprising a thyristor converter with a control topic ₁₀ , current and speed sensors, current and speed controllers, which allows to improve the dynamic performance of the drive, the accuracy and speed of the voltage regulation system [1 j. ,5

However, this device does not allow to automatically switch to the electric braking mode when driving at a constant speed of the pbdvizhny composition on the ups and downs. 20

The closest to the proposed technical essence and the achieved positive effect is a device for controlling the speed of a traction electric motor, comprising a proportional speed controller, a current regulator, a pulse converter control system · *: a converter, a pulse converter, the output of which is connected to the armature circuit traction motor, motor speed sensor, the output of which is connected to the input of the proportional speed controller, current sensor, vk li ne "ny in the traction motor armature circuit and an output coupled to an input of the current regulator.

The output voltage of the speed controller is input to a proportional integral current controller, setting the magnitude of the motor current. The output of the current regulator acts directly on the control system of the pulse converter C2J. ·

However, the device in question also does not allow to realize the automatic mode of stabilization of the speed of movement when following the ascents and descents, which reduces the accuracy of regulation.

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

The goal is achieved, _s that the device for controlling the traction motor speed is further introduced (relay coasting, braking relay logic elements NOT, AND-NO, the input switch connected to the output proportional to the speed controller, the output braking relay connected. To the first input logic of an AND-NOT element, and the output of the run-out relay through a logical element NOT - with the second input of an AND-NOT element, the output of which is connected to the second input of the pulse converter control system.

The introduction of additional coasting relays, braking relays, logical elements NOT, AND-NOT, and their corresponding connection / lowering makes it possible to stabilize the speed φιι by changing the path profile and to improve the gas and traction control of the traction drive.

In Fig., 1 and 2 shows a block diagram and a diagram of the operation of the device for controlling the speed of the traction electric drive. .

The device comprises series-connected proportional speed controller 1, current controller 2, pulse converter control system 3, pulse converter 4, traction motor 5 connected to the input of the speed sensor 6, the output of which is connected to the input of the proportional speed controller 1, the current sensor 7 included in the anchor chain of the traction motor 5 and the output of which is connected to the input of the current regulator 2, additionally, the coast relay 8, relay 9, logic elements are NOT AND NOT 11, and the inputs of relay 8 are connected They are connected to the output of the growth regulator, the output of the braking relay 9 is connected to the first input of the AND-11 logic element, and the output of the relay 8 is run out through the logic element NOT 10 to the second inputs of the AND-NOT 11 element, the output of which is connected to the second input of the control system 3 pulse converter 4.

/ The device operates as follows.

When you change the profile of the path, for example, when moving from the site to the slope, the speed of movement begins to increase. Proportional speed controller 1) 0

ΤΟρ10, sko45

069725 4 through the current regulator 2 reduces the current of the motor 5. However, by virtue of its structural; features, the pulse control system cannot reduce the current to zero, and the sequential excitation motor 5 does not have the property of a natural transition to the electric braking mode. Upon reaching the set value of the speed of movement ^ 30 a (Fig. 2), the output voltage of the proportional speed controller 1, which is the setpoint voltage for the current controller 2, drops to zero and then changes its sign. Coasting relay 8, 15 which is a semiconductor voltage relay and connected to the output of the speed controller 1, is triggered and, through logical elements NOT 10 and AND-NOT 11, gives a command to turn off the pulse-converter control system 3. •Relay. coasting is adjusted so that its operation occurs after reaching the lower limit of regulation of the current of the traction motor 5 at speed =. With a further increase in the speed of movement and _{when it reaches a} certain set value V _3aA + zlV ₂ greater than X / ₄ , the brake relay 9 is activated, which gives the command to switch the power circuit to the brake mode and, through the AND — NOT 11 logic element, releases the command, filed from the relay 8 run-on to turn off the control system 3, i.e. turns her on.

With a decrease in the speed of movement, all switching occur in the reverse order.

The introduction of additional elements of the relay 8. coasting, relay 9 braking, logical elements NOT 10 and NOT 11 and their corresponding connection allow you to carry out the driving mode at a given speed with the maximum motor current limited 5. The device automatically switches the traction drive from traction to brake mode and, back using run-out depending on the given accuracy of maintaining the profile of the path.

Claims (2)

1. USSR author's certificate number 391690, cl. H 02 R 5/06 1971. 2. Lebedv E. D. and others. Control of DC electric drives, Moscow, Energiya, 19 7O, p. 59.