RU76295U1 - TRACTION ELECTRIC DRIVE - Google Patents

Abstract

Traction electric drive belongs to the field of railway transport and can be used on vehicles with DC traction motors, in particular on AC electric locomotives with pulsating current traction motors. In traction mode, the anchor winding (2) and the field winding (3) of the DC traction motor are powered by a power source (1). The speed is controlled by turning on the contactor (5) and the first thyristor (7), while the first resistor (4) is turned on in parallel with the field winding (3) of the DC traction motor. In case of voltage surges or short-term power loss, the first thyristor (7) is turned off to prevent emergency operation of the DC traction motor. To turn off the first thyristor (7), use the second thyristor (8), a capacitor (6) and a voltage converter with galvanic isolation (10). The capacitor (6) is charged through the circuit, the first output of the voltage converter with galvanic isolation (10), the second resistor (9), the capacitor (6), the first thyristor (7), the second output of the voltage converter with galvanic isolation (10). The technical result consists in increasing the reliability of the traction electric drive due to the charge of the capacitor from the voltage converter with galvanic isolation and reducing the number of elements. 1 ill.

Description

The utility model relates to the field of railway transport and can be applied on vehicles with DC traction motors, in particular on AC electric locomotives with pulsating current traction motors.

Known traction electric drive, which contains a power source, traction DC motor, two resistors, ten contactors, inductive shunt (Electric locomotive VL80S: Operation manual / N.M. Vasko et al.-2nd ed. M .: Transport, 1990, p. 200).

The drawback of the traction electric drive: low reliability due to the large number of additional elements.

Known traction electric drive containing a power source, two DC traction motors, four resistors, main and switching thyristors, a capacitor, three contactors (RU 2208530, B60L15 / 08, Bull. No. 20, 07/20/2003 prototype).

The drawback of the traction electric drive: low voltage at the switching capacitor, which reduces the reliability of locking the main thyristor.

The objective of the utility model is to increase the reliability of the traction electric drive.

The technical result is achieved by the fact that in the traction electric drive containing a power source, the armature winding and the field winding of the DC traction motor are connected in series, the first resistor is connected to their common output, the second resistor and capacitor are connected in series, the first and second thyristors, a contactor, a common bus , it additionally includes a voltage converter with galvanic isolation, the free output of the anchor winding of the DC traction motor is connected to a power source, the free output of the first resistor through a contactor is connected to a common output

the capacitor and the anode of the first thyristor, the anode of the second thyristor is connected to the common output of the capacitor and the second resistor, the free output of which is connected to the first output of the voltage converter with galvanic isolation, the input of which is designed to connect a power source, its second output is connected to the cathodes of the first and second thyristors and the free output of the field winding of the DC traction motor and is connected to a common bus.

The drawing shows a circuit diagram of the proposed traction electric drive.

In accordance with the drawing, the traction electric drive contains a serially connected power supply 1, an anchor winding 2 and an excitation winding 3 of a DC traction motor, the first resistor 4 is connected to their common terminal, the free terminal of which is connected through a contactor 5 to the common terminal of the capacitor 6 and the anode of the first thyristor 7, the anode of the second thyristor 8 is connected to the common terminal of the capacitor 6 and the second resistor 9, the free terminal of which is connected to the first output of the voltage converter with galvanic isolation 10 (e.g. Mer, ECL15, journal "Modern Automation Technologies" No. 4, 2007, p.105), the input of which is designed to connect a power source, its second output is connected to the cathodes of the first 7 and second 8 thyristors and the free output of the field winding 3 of the DC traction motor and connected to a common bus.

Traction electric drive operates as follows. The anchor winding 2 and the field winding 3 of the DC traction motor receive power from the power source 1. The speed is controlled by turning on the contactor 5 and the first thyristor 7, while the first resistor 4 is turned on in parallel with the field winding 3 of the DC traction motor. When surges or short-term loss power supply, the first thyristor 7 is turned off to prevent the emergence of emergency modes of traction

DC motor. To turn off the first thyristor 7, use the second thyristor 8, the capacitor 6 and the voltage converter with galvanic isolation 10. The capacitor 6 is charged through the circuit: the first output of the voltage converter with galvanic isolation 10, the second resistor 9, capacitor 6, the first thyristor 7, the second output of the converter isolated voltages 10.

The proposed traction electric drive realizes the task - it increases reliability due to the charge of the capacitor from the voltage converter with galvanic isolation and reducing the number of elements.

Claims (1)

A traction electric drive comprising a power source, an armature winding and an excitation winding of a DC traction motor connected in series, a first resistor connected to a common terminal, a second resistor and a capacitor connected in series, a first and second thyristors, a contactor, a common bus, characterized in that additionally, a voltage converter with galvanic isolation is introduced, the free output of the anchor winding of the DC traction motor is connected to a power source, the free output of the primary the resistor through the contactor is connected to the common terminal of the capacitor and the anode of the first thyristor, the anode of the second thyristor is connected to the common terminal of the capacitor and the second resistor, the free terminal of which is connected to the first output of the voltage converter with galvanic isolation, the input of which is used to connect the power source, its second output is connected with the cathodes of the first and second thyristors and the free output of the excitation winding of the DC traction motor and connected to a common bus.