SU1546305A1 - Traction electric drive - Google Patents

Abstract

The invention relates to transport and can be applied to contact-battery electric vehicles. The purpose of the invention is to increase reliability. The traction motor consists of an electric motor with windings 1 and 2 of the core and excitation, which are connected through a thyristor interrupter 8 and separation thyristors 9 and 11 to the power source 10, and through the interrupter 8 and the separation diode 7 and thyristor 11 to a battery 6. Thyristor 14 charges are connected between one of the outputs of the chopper 8 and the battery 6, and the contacts 15 and 16 of the contactors are connected by one of the terminals to the battery 6. 1 Il.

Description

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The invention relates to transport and can be applied on contact-accumulator electric vehicles.

The purpose of the invention is to increase reliability

The drawing shows the principal electrical scheme of the proposed electric traction drive.

The traction motor contains an electric motor with windings 1 and 2 core and excitations, shunted by reverse diode 3, connected in series and shunted by reverse diode 4, smoothing reactor 5, and battery 6, the positive terminal of which is connected through the separation diode 7 to the thyristor input an interrupter 8 connected to the cathode of the separation thyristor 9, the anode of which is connected to the positive terminal of the power supply 10. One of the outputs of the thyristor interrupter 8 is connected to one of the winding terminals 1 box through an isolating thyristor 11, and the anode of the reverse diode 3 is connected to the negative terminal of the battery 6 connected to the negative terminal of the power supply 10 of the switching thyristor 12 the capacitor 13 of the thyristor interrupter 8 is connected to another output of the thyristor interrupter 8, to one of the outputs of which is connected the anode of the thyristor 14 of the charge of the battery, the cathode of which is connected to the positive terminal of the battery hydrochloric battery 6 is serially connected between the positive and negative terminals of battery B contacts 15 and 16 of contactors, the midpoint of the compound which is connected to one terminal of the winding drive 2.

The thyristor breaker 8 contains the main thyristor 17, in parallel to which a recharge diode 18 is connected in the opposite direction. The cathode of the main thyristor 17 is connected to the cathode of the switching thyristor 20 via the recharge diode 19 and the anode of the main thyristor 17. Parallel to the switching thyristor 20 connected in series switching capacitor 13 and the reactor 21.

Traction drive works as follows.

In the motor mode, contact 16 is closed and the voltage on the windings 1 and 2 of the electric motor is controlled from the minimum determined by the difference in voltages of the power source 10 or the battery 6 and the capacitor 13 by changing the moment of applying pulses to the separation thyristors 9, 11 and the thyristor 12 charge relative to the pulse to the switching thyristor 20 in the recharge interval of the capacitor 13, and to the voltage of the power source 10 or the voltage of the battery 6 by the pulse-width method.

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If the voltage of power supply source 10 exceeds the voltage of battery 6, then separation diode 7 is locked and the actuator receives power from source 10. When the voltage of power supply 10 of power supply 10 goes down or its value is lower than the battery voltage, the thyristor 9 locks and the actuator is powered by a battery 6.

In motor mode, the charge of the battery is carried out along the thyristor 14 circuit. When the thyristors 9, 11, 17 and 14 are simultaneously turned on, the charge current of the battery is determined by the change in the filling factor of the thyristor interrupter 8 during the motor starting process. By varying the time of switching on the thyristor 14 in the interval of the open state of the thyristors 9, 17 and 11, the control of the charge current of the battery 6 is independent of the filling factor of the thyristor interrupter 8 in motor mode

At low load currents of the electric drive, effective charging of the battery 6 is achieved by simultaneously turning on the thyristors 9, 17 and 14 with their subsequent switching, and the voltage is controlled by varying the time of turning on the thyristor 11 in the open state interval of the thyristors 9 and 17.

To implement regenerative braking, contact 16 is closed and contact 15 is closed. In the open state of the thyristors 11 and 17, the windings 1 and 2 of the electric motor are short-circuited: the root winding I - excitation winding 2 - contact 15 - diode 7 - thyristors 17 and 11 After locking thyristors 17 and And the energy of the battery 6 is recovered through the circuit: windings 1 and 2 of the electric motor - contact 15 - battery 6 - smoothing reactor 5 - reverse diode 3. Battery current b after turning on the thyristors 17 and I decreases through smoothing reactor 5 and reverse diode 4.

To implement only the charging mode of the battery 6, the control pulses are removed from the thyristor 11 and the contact 15 is closed. 9, 14 and 17 and their commutation. At the same time, the charge current increases along the circuit: positive terminal of power supply 10 - thyristor 9 - thyristor interrupter 8 - thyristor 14 - accumulator battery 6 - smoothing reactor 5 - negative terminal of power supply 10. After locking the thyristor interrupter 8 and, consequently, thyristors 9 and 14, the current drops in the circuit: battery b - smoothing reactor 5 - reverse diode 4. The intensity of the current reduction is determined by the parameters of the smoothing reactor 5 of battery 6. Change the fill factor of the thyristor interrupter 8, it is possible to regulate the charge current of the battery 6.

The proposed device provides separate regulation of the battery charge current and the motor voltage in the motor mode, as well as regenerative braking.

Claims (1)

Invention Formula A traction electric drive containing a direct-current motor of sequential excitation, one of the terminals of which is connected to one of the thyristor interrupters with parallel-capacitive switching through one of the distribution thyristors and whose input through the other separating thyristor is connected 0 five 0 one of the power supply terminals, and through an isolation diode - with one of the battery terminals connected by another output to one of the smoothing reactor's leads, the other output of which is connected to the other power supply terminal and the anode of one of the reverse diodes connected by a cathode to one of the the battery terminals, to the other terminal of which the anode of another reverse diode is connected, connected by a cathode to one of the DC motor terminals, and the cathode cathode of the switching capacitor, thyristor a chopper, the anode of which is connected to another output of the thyristor chopper, characterized in that, in order to increase reliability, it is equipped with a battery charging thyristor and contactors, some of the terminals of the power contacts of which are connected to another output of the DC motor, and others pins - with pins of a battery, to one of the pins of which and to one of the outputs of the thyristor chopper is connected a battery charging thyristor.