RU72913U1 - DC TRACTION ELECTRIC DRIVE - Google Patents

Abstract

DC traction electric drive belongs to the field of railway transport and can be used on vehicles with DC traction motors. In traction mode, the contactor (3) is off. In this case, the traction motor operates in the full excitation mode. In the process of acceleration, the contactor (3) is turned on, while the traction motor goes into a weakened excitation mode. During the control cycle, the current of the anchor winding (2) of the DC traction motor flows through a capacitor (7) parallel to the field winding (5) of the DC traction motor. In the event of transients associated with fluctuations in the voltage of the power source (1) and a change in the adhesion force, the field winding (5) of the DC traction motor receives power from a capacitor (7), which stabilizes the excitation current. The diode (6) serves to prevent the discharge of the capacitor to the resistor (4) in the mode of attenuation attenuation. The technical result consists in increasing the reliability of the traction DC electric drive by stabilizing the excitation current of the traction motor during transients, 1 il.

Description

The utility model relates to the field of railway transport and can be applied on vehicles with traction DC motors.

Known traction electric drive of direct current, which contains a power source, traction motor of direct current, 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 during transients associated with short-term blackouts of the power supply, as a result of which the demagnetization of the traction DC motor can occur and when the power supply is turned on again, unacceptably large inrush currents will result in failure of the traction DC motor.

Known traction electric DC drive, which contains a power source, traction DC motor, contactor, two resistors, voltage relays (Plaks A.V. Control systems for electric rolling stock. - M .: Route, 2005, p. 71 prototype).

The drawback of the traction electric drive: low reliability during transients associated with voltage fluctuations and a change in the adhesion force, as a result of which the excitation current changes from the maximum value to the minimum, which can cause exceeding the maximum value of the armature current of the traction motor and circular light on the collector of the traction motor.

The objective of the utility model is to increase the reliability of the DC traction electric drive by stabilizing the excitation current of the traction motor during transients.

The technical result is achieved in that a direct current traction electric drive comprising a power source, an anchor winding of a direct current traction motor, a contactor, a resistor, an excitation winding of a direct current traction motor, is connected to a common terminal of a resistor and an excitation winding of a direct current traction motor additionally introduced a capacitor and a diode, the anode of which is connected to the common output of the armature winding of the DC traction motor and contactor, its cathode connected to a free terminal of the field winding of the DC traction motor and a capacitor, the free terminal of which is connected to a common bus.

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

In accordance with the drawing, a DC traction electric drive containing a power source 1, an anchor winding 2 of a DC traction motor, a contactor 3, a resistor 4, a field winding 5 of a DC traction motor, connected to a common terminal of a resistor 4 and a field winding 5 of a DC traction motor a common bus is connected to the current, the anode of the diode 6 is connected to the common output of the armature winding 2 of the DC traction motor and contactor 3, its cathode is connected to the free output of the excitation winding 5 t DC traction motor, and a condenser 7, a free end connected to a common bus.

Traction DC drive operates as follows. In traction mode, contactor 3 is off. In this case, the traction motor operates in the full excitation mode. In the process of acceleration, the contactor 3 is turned on, while the traction motor goes into a weakened excitation mode. During the control cycle, the current of the anchor winding 2 of the DC traction motor flows through the capacitor 7, parallel to the excitation winding 5 of the DC traction motor.

When transients occur, associated with fluctuations in the voltage of the power source and a change in the adhesion force, the field winding 5 of the DC traction motor receives power from the capacitor 7, which stabilizes the excitation current. The diode 6 serves to prevent the discharge of the capacitor to the resistor 4 in the mode of attenuation attenuation.

The proposed traction DC electric drive realizes the task - it improves the reliability of the DC traction electric drive by stabilizing the excitation current of the traction motor during transients.

Claims (1)

A DC traction electric drive containing a power source, an anchor winding of a DC traction motor, a contactor, a resistor, a field winding of a DC traction motor, connected to a common terminal of a resistor and a field coil of a DC traction motor, connected to a common bus, characterized in that In addition, a capacitor and a diode are introduced, the anode of which is connected to the common terminal of the armature winding of the DC traction motor and contactor, its cathode is connected to dnym terminal traction motor field winding and a DC capacitor, a free end connected to a common bus.