SU1220095A1 - D.c.drive - Google Patents

Abstract

The invention is used in automated DC drives. The purpose of the invention is to increase reliability. The electric drive contains an electric motor (E) 1, a converter made on thyristors 2–7, a three-phase transformer with a secondary winding 8, an uncontrolled rectifier, filled on diodes 9–11, filtering ±: “Y - -“ / 7 2 g -K} - 14 I 15. “-N O (L with 5 WI A-: 0 cl

Description

the capacitor 12 and the charge thyristor 13. The switching thyristors 14, 15 are connected to the core winding E 1, the switching capacitor 16 and the choke 17. Introduction recharge The invention relates to the electrical industry and can be used in automated electric current drives.

The purpose of the invention is to increase reliability.

The drawing is a schematic of a DC motor drive.

The electric drive contains an electric motor 1, a converter made on thyristors 2-7, the input of which is connected to the secondary winding 8 of a three-phase transformer with zero output, and the output to the first terminal of the main winding of the electric motor 1, an out of control rectifier, filled with diodes 9 -11, the input of which is connected to the secondary winding 8 of a three-phase transformer with zero output, and the output to the first plate of the filter capacitor 12 and to the anode of the charge thyristor 13, the second plate is filtering. the capacitor 12 and the second output of the main winding of the electric motor 1 are connected to the zero output of the secondary winding 8 of a three-phase transformer, commutation of thyristors 14, 15, some of the opposite electrodes of which are combined and connected to the first output of the main winding of the electric motor 1, and others to the second capacitor of the switching capacitor 16 and the first pin of the choke switches 17, the first plate of the switching capacitor 16 is connected to the second pin: the core winding of the motor 1, rechargeable thyristor 18, the anode of which is connected to Odom charging thyristor 13 and a second terminal of the choke 17 and the cathode - to said first electrode of the switching capacitor 16.

The drive works as follows.

1220095

The thyristor 18 provides the electric drive with fewer elements, which simplifies the circuit and increases reliability. 1 il.

In the interval of operation of the thyristor group 2-4. the control thyristor 13 receives control pulses simultaneously with the thyristor pulses 2–4, as a result of which the switching capacitor 16 is charged across the circuit 1) the secondary winding 8 of the three-phase transformer — diode 9 (10, 11) –– charge thyristor 13 - choke 17 is a switching capacitor 16 secondary winding 8 of a three-phase transformer. If the voltage on the filter capacitor

12 the instantaneous value of the rectified voltage exceeds, then the charge of the switching capacitor 16 is carried out along the loop the filtering capacitor 12 - charge thyristor

13 - choke 17 - switching capacitor 16 - filtering capacitor 12,

When a signal is received from the electric drive control system for locking the thyristor group 2-4, the switching thyristor 14 is switched on, the reverse voltage is applied to the currently conducting thyristor 2 (3.4) along the switching capacitor 16 - switching thyristor 14 - thyristor 2 (3.4) - secondary winding 8 of a three-phase transformer - switching capacitor 16 exceeding the instantaneous value of the converter voltage, and, conducting the current, thyristor 2 (3.4) is locked, and the load current is transferred from it to the switching capacitor 16 and a switching capacitor flows along the circuit 16 - switching thyristor 14 - electric motor 1 - switching capacitor 16.

After the current in the specified circuit has reached zero and the switch-over thyristor 14 has the locking properties of the discharge, the supply of the repeated control pulse to the thyristor 2 (3.4) is allowed or the inclusion of the second group of thyristors 5-7 is permitted. In the first case, simultaneously with the turning on of the thyristor 2 (3,4), the charging thyristor 13 is switched on and the charging and charging of the switching capacitor 16 over the circuit to the switching switching capacitor 16 secondary winding 8 of the three-phase transformer — diode 9 (10, 11) –– charging thyristor occurs 13 - throttle 17 - switching capacitor 16 or switching capacitor 16 - filtering capacitor 12 - charge thyristor 13 - choke 17 - switching capacitor 16. After restoring the locking properties of the charge thyristor 13, the switching capacitor is ready again to work.

In the second case, simultaneously with the thyristor 5 (6,7), the charge thyristor 13 is turned on and the commutation capacitor 16 is charged similarly to the first case and with the same polarity. After the current in the charge circuit reaches zero and the locking properties of the thyristor 13 are restored, a control pulse is applied to the recharge thyristor 18, as a result, the switching capacitor 16 is recharged along the circuit switching capacitor 16 - choke 17 - resetting capacitor 1B - switching capacitor 16 After restoring the blocking properties of the thyristor 18, the switching capacitor is ready for operation.

When a signal is received from the electric drive control system for locking the thyristor group 5-7, the switching thyristor 15 is switched on, a reverse voltage is applied to the currently conducting thyristor 5 (6.7) across the circuit of the switching capacitor 16 t winding 8 of the transformer - thyristor 5 (6 , 7) - switching thyristor 15 - switching capacitor 16 and, conducting the current, the thyristor 5 (6,7) is locked, and the load current is transferred to it on switching capacitor 16 and the switching capacitor 16 flows through the circuit - electric motor 1 - switching UKITS thyristor 15 - kommutiruyu1dy capacitor 16. After reaching the current in said loop

20095

the zero value and the restoration of the locking properties of the switching thyristor 15 allow the supply of a re-controlling pulse to 5 thyristor 5 (6,7) or the inclusion of the first group of thyristors 3,2,4 is allowed. When using the throttles 17 as a charge and recharge, the recharging time of the switching capacitor SO is less than or equal to the charging time and does not make a significant change in the duration of the process of preparing it for operation.

15

Thus, the proposed technical solution allows the operability of the electric drive with a smaller number of 2Q elements, which simplifies the circuit and improves the reliability of the electric drive.

Claims (1)

Invention Formula 2J A DC electric drive containing an electric motor, a converter with separate control of valve groups, performed in a three-phase anti-parallel zero circuit, whose input is connected to the secondary winding of a three-phase zero-output transformer, the primary winding of which is intended to be connected to the network, and the output to first conclusion root  motor windings, an uncontrolled rectifier, made according to a three-phase zero circuit, whose input is connected to the secondary winding of a three-phase transformer with zero 30 40 45 the output terminal, and the output is to the first lining of the filter capacitor and to the charge thyristor anode, the second. The cover of the filtering capacitor and the second terminal of the motor winding are connected to zero output of the secondary winding of a three-phase transformer, switching thyristors, some of the opposite electrodes of which are combined and connected to the first terminal of the motor winding, and others to the second plate of the switching capacitor and the first terminal of the throttle, the first plate of the switching motor capacitor is connected to the second terminal of the motor winding, characterized in that, in order to increase the reliability 512200956 In this case, a rechargeable charge is introduced into it by the second output of the throttles, and the cathode is a thyristor, the anode of which is connected to the first plate of the cathode commuting charge thyristor and from the capacitor.