SU796006A1 - Apparatus for pulse regulating of traction electric motor speed - Google Patents

Description

The invention relates to a device for controlling the speed of DC traction motors and can be used on an electrically movable part with DC traction motors.

A device is known for pulsed, '' controlling the speed of a traction electric motor, containing the main, switching and recharge thyristors with its control pulse shapers, time delay elements of the switching and main thyristors and current zero sensors, one of which is connected in series with the recharge thyristor and the other - in series with the switching thyristor fl].

The disadvantage of this device is the impossibility of a sustainable transition from the amplitude mode. modulation in the mode of latitudinal regulation and vice versa.

The aim of the invention is to increase the reliability of the device during the transition from the amplitude modulation mode to the latitudinal regulation mode and vice versa.

This goal is achieved in that the device is equipped with an amplitude thyristor with its own shaper. control pulses and two inhibition circuits, one of which is connected by inputs to the output of the zero current sensor in the circuit of the rechargeable thyristor and by the output of the time delay element of the switching thyristor, and the output is from the form- ¹ . pulser of the amplitude thyristor pulses, while the zero current sensor in the circuit of the rechargeable thyristor is also connected to the output of the time delay element of the “switching thyristor, another inhibit circuit is connected by inputs to the output of the first inhibit circuit and the output 'of the zero current sensor in the switching thyristor circuit, and the output from the input of the adjustable element of the time delay of the main thyristor.

The drawing shows a diagram of the proposed device.

The device 1 consists of a thyristor pulse converter 1 connected between the armature of the traction motor 2 and the field winding 3, which are shunted by diodes 4 and 5, respectively. In series with the anchor of the traction motor 2, an armature current sensor 6 is connected, connected to the positive pole of the power supply 7 *.

The thyristor pulse converter includes a main thyristor 8, shunted in the opposite direction by a diode 9, a switching circuit consisting of a capacitor 10 and a reactor 11, a recharge thyristor 12 controlled by a control unit 13 through a control pulse generator 14 and shunted in the opposite direction by an amplitude thyristor 15. In series with the recharge thyristor 12, a current zero sensor 16 is turned on, and its outputs are connected to the input of the first inhibit circuit 17 and the input of the time delay element 18. The first output of the time delay element 18 is connected to the pulse shaper 19 of the switching thyristor 20, the anode of which is connected to the current zero sensor 16 and the cathode to the current zero sensor 16, and the second output of the element 18 is connected to the input of the inhibit circuit 17. The output of the inhibit circuit 17 is connected to the driver 22 of the control pulses of the amplitude thyristor 15 and to the input of the inhibit circuit 23, the other output of which is connected to the current zero sensor 21. The output 'of the inhibit circuit 23 is connected to the time delay element 24, the output of which is connected to the control pulse shaper 25. The output of the armature current sensor 6 is connected to the comparison elements of the time delay elements 18 and 24, as well as to the element 13. A charging resistor .30 is connected between the common point of the current zero sensor 16 and the anode of the switching thyristor 20 and the negative pole of the power supply

26.

The device works as follows.

Start-up starts with the amplitude modulation mode implemented by the switching circuit and the amplitude thyristor 15. The amplitude 'modulation mode is controlled by changing the delay time of the pulses from the current zero sensor to the time delay element 18 depending on the output voltage of the current sensor With the release of dates, the rest of the rest is banned from

796006 4 ry, controlling the magnitude of the current in the chain of the armature of the traction motor.

In the amplitude modulation mode, the ban circuit 17, 23 creates a ban on controlling the main thyristor 8.

The pulse from the output of the inhibit circuit 17 appears at the input of the driver 22 only if the first inhibit of the zero current chick, in possible cases, control of the thyristor 15, which is necessary for the normal functioning of the device.

With increasing speed and reaching the output voltage of the armature current sensor, the minimum value, the delay time of the output pulse of the sensor 16 current zero element 18 of the time delay becomes equal to zero. A ban is created on the control of the amplitude thyristor 15.

The system goes into latitudinal control mode. Control in this mode is carried out using the element 24 of the time delay. The pulse from the output of the inhibit circuit 23 appears at the input of the time delay element 24 only in the case of a pulse from the current zero sensor 21 in the absence of a signal from the output of the inhibit circuit 17. In all other possible cases, cos-. a ban on thyristor control is given 8.

Claims (1)

The device 1 consists of a thyristor pulse converter I, connected between the main motor 2 and the excitation winding 3, which are shunt. diodes 4 and 5, respectively. Consistently with the corelet motor 2, the sensor 6 for the current of the core is connected to the positive pole of the power source. The thyristor pulse converter includes a main thyristor 8 in a reverse-shunted diode 9, a switching circuit consisting of capacitor Yu and reactor II, a rechargeable thyristor 12 controlled by control unit 13 through driver pulse shaper 14 and shunted in reverse The jptH is directed by the amplitude thyristor 15. A current zero sensor 16 is connected in series with the recharge thyristor 12, and its outputs are connected to the input of the first prohibition circuit 17 and the input of the time delay element 18. The first output of the time delay element 18 is connected to the driver 19 of a KOMiviytiiruyushchego thyristor 2O, the anode of which is connected to the current zero sensor 16, and the cathode to the current zero sensor 16, and the second output of the element 18 is connected to the prohibition circuit 17. The output of the prohibition circuit 17, is connected to the driver 22 of the control pulses of the amplitude thyristor 15 and to the input of the prohibition circuit 23, the output of which is connected to the current sensor 21. The output of the inhibitor circuit 23 is connected to the element 24 in the belt delay, the output of which is connected to the driver 25 of the control pulses. Output, sensor 6, the current core is connected to the elements compared to elements 18 and 24 of the time delay, as well as to element 13. A charging resistor 26 is connected between the common point of the sensor 16 zero current and the anode of the switching thyristor 20 and the negative pole of the power supply 7. in the following way . The start starts from the amplitude MODULE MODE, implemented by the switching circuit and the amplitude thyristor 15. The amplitude modulation mode is controlled by varying the delay time of the pulses coming from the zero current sensor to the time delay element 18 depending on the output value of the 1 core current sensor controlling the value current in the circuit of the t electric motor. In the amplitude modulation mode, interdiction circuit 17, 23 prohibits the control of the main thyristor 8. An impulse from the output of interdiction circuit 17 appears at the input of the imaging unit 22 only when the inhibitory signal first arrives from the output of the zero current sensor at the input of the circuit. In all other possible cases, a prohibition is imposed on the control of the thyristor 15, which is necessary for the normal functioning of the device. With increasing speed and reaching the output voltage of the current sensor cor, the values of the minimum value, the delay time of the output pulse of the sensor 16, the current zero by the time delay element 18 becomes zero. A ban on the control of amplitude thyristor {form 15. The system enters the mode of latitude regulation. Control in this mode is accomplished with a time delay element 24. A pulse from the output of the inhibitor circuit 23 appears at the input of the time delay element 24 only in the event of a pulse arriving from the current zero sensor 21 in the absence of a signal from the output of the inhibitor 17. In all other possible cases soz-. control of the thyristor 8 is prohibited. sequentially with a secondary thyristor, and the other sequentially with a commuting one. a thyristor, characterized in that. In order to increase reliability, it is equipped with an amplitude thyristor with its control pulse shaper and two inhibitor circuits, one of the KqtPfs is connected to the inputs of the current zero-thyristor circuit and the output of the switching time-delay element of the thyristor, and the output - with the impulse generator of the amplitude thyristor, with the sensor zero; The current in the recharging circuit of the thyristor is also connected: with the passage of the time delay element of the switching thyristor, another prohibition circuit is connected by inputs to the output of the first prohibition circuit .and the output of the zero sensor in the switching thyristor circuit. and the output - with the input of an adjustable element of the time delay of the main thyristor. Sources of information taken into account in the examination I. USSR author's certificate N 561263 cl. B 60 X 1-S / 04, 1975.