SU434037A1 - DEVICE FOR PULSE REGULATION OF TRACTOR ELECTRIC MOTOR - Google Patents

Description

one

This invention relates to the field of non-contact direct current pulse converters for powering a traction motor, mainly trackless electric transport in traction and electric braking modes.

A device for pulse control of a traction electric motor powered by a battery is known, containing two main thyristors, between the anodes of which a switching capacitor is connected and in series with one of which switching thyristor and a choke are connected, and with the other - a traction motor with a series excitation winding, included in the diagonal of the alternating current of the thyristor bridge, between which the separator valve is turned on, with the windings of the core and excitation being shunted by each its reverse electric valve.

A disadvantage of the known device is the complexity of the transition from the traction mode to the brake mode.

The purpose of the invention is to simplify the transition from the motor to the brake mode and ensure the charge of the battery.

For this, the device is equipped with an additional thyristor connected between the winding of the electric motor and

the cathode of its reverse electric valve, an additional electric valve shunting this additional thyristor, another additional thyristor, connected to the ear by the cathode of the first additional thyristor and the cathode of the separation valve, and another additional electric valve connected between the anode of the separation valve and the negative terminal of the battery. In order to charge the battery from the AC source, the device is equipped with two electrical contacts, one of which is connected between

the cathodes of an electric return valve, which shunt the field winding, and a separation valve, and the other in series with the field winding.

The drawing shows the principal

electrical circuit device.

The power circuit of the device contains the input terminals 1, 2; thyristors 3-11; electric valves 12-16; switching capacitor 17 and choke 18; electric

contacts 19, 20; the winding 21 of the core and the winding 22 of the excitation; traction motor; 23, 24 AC. The circuit is energized by the positive pole of clamp 1.

In the engine mode of operation include

with thyristors 3, 4, 5, 7 and, depending on the direction of rotation, thyristors 8, 9 or 10, 11. Thyristors 7 and 8, 9 or 10, 11 remain switched on both in pulse and in pause, as in continuous current mode through them always passes current. At the beginning of the pulse, the thyristors 3, 4 are turned on, as a result of which the switching capacitor 17 is charged through the choke 18. After charging the capacitor 17, the thyristor 4 is locked and the thyristor 3 remains on until the thyristor 5 is turned on. After that, the thyristor 3 is locked, and the capacitor 17 is recharged through the windings 21, 22 from the source. After recharging the capacitor 17, the thyristor 5 is locked, and the load current in the pause flows through the electric valves 12, 13 and the thyristor 7. Turning the thyristors 3, 4 and 5 unlocked, the average voltage across the load can be adjusted.

To switch to the pulsed regenerative braking mode, it is necessary to turn off the control pulses of all thyristors; wait a certain time during which the current of the core 21 decreases to zero, resulting in the thyristor 7 is prohibited, and then simultaneously turn on the thyristors 3, 4, 6. The capacitor 17 is charged from the source through the choke 18 and the thyristors 3, 6 short the load circuit. The current of the short-circuited core flows through the circuit 21-6-8 (or 10) -20-22-22-9 (-or 11) -3-16-21. Electric valve 15 is locked. The thyristor 7 separates the short-circuited cortical circuit from the source, and the electric valve 16 facilitates the passage of the core current through the power thyristor 3. The thyristor 5 is turned on for locking the thyristor 3. The thyristor 3 is locked. The capacitor is recharged along circuit 17-5-16-21-6-8 (or 10) -20, 22-9 (or I) -17, after which the thyristors 5 and 6 are locked, and the core current under the action of sum E. DS rotation and self-induction flows through the circuit 21-14-1-2-16-21, i.e. the energy is given to the source, in this period of time the excitation winding 22 discharges its electromagnetic energy through the electric valve 12.

A series of unlocking of thyristors 3, 4, 6 and 5, it is possible to carry out pulsed recovery:

To go into motor mode, control signals are removed from the thyristor 6

and are supplied to the thyristor 7. Subsequently, the device operates as before.

In order to go into the rectifying mode, the battery must be charged in the initial position and the contacts 19, 20 open, and all the thyristors of the circuit are locked, and an alternating current is applied to the terminals 23, 24. Properly controlled thyristors 8, 9, 10, 11, charge the battery, and the charging current flows through the circuit: terminals 23-24 thyristor bridge-12-13-1--2-16-15- thyristor bridge - clamps 23-24.

Subject invention

Claims (2)

1. A device for pulse control of a traction electric motor powered by a battery containing two main thyristors, between the anodes of which a switching capacitor is connected and in series with one of which switching thyristor and a choke are connected, and with the other - a driving motor with a series excitation winding included in the diagonal of the alternating current of the thyristor bridge, between which the separating valve is turned on, the core and exciter windings being shunted each A reverse electric valve, characterized in that, in order to simplify the transition from the motor to the brake mode, it is provided with an additional thyristor connected between the winding of the box an electric motor and the cathode of its reverse electric valve, an additional electric valve shunting said additional thyristor, another additional thyristor connected between the cathodes of the first additional thyristor and a separating valve, and another additional electric valve connected between the anode of the separating valve and the negative terminal of the battery. 2. The device according to claim 1, characterized in that, in order to ensure the charge of the battery, it is equipped with two electrical contacts, one of which is connected between the cathodes of the reverse electric valve shunting the field winding and the separating valve, and the other in series with field winding.