SU1365315A1 - D.c. electric drive - Google Patents

Abstract

This invention relates to electrical engineering and can be used in load reversing devices. The aim of the invention is to increase reliability. The drive contains second inputs of control buses Forward 15 and Back 16, fifth and sixth relays and two diodes 17 and 18. Windings 19 and 20 of the fifth and sixth relays are connected to the electric motor 1 through the indicated diodes 17 and 18. Second inputs of control buses Forward 15 and Back 16 are connected to their first inputs 7 and 8 via disconnecting contacts of group 21 and 22 of the fifth and sixth relay. This device provides for the elimination of short circuits with simultaneous input signals. 1 hp f-ly, 1 ill.

Description

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This invention relates to electrical engineering and can be used in load reversing devices.

The aim of the invention is to increase reliability.

The drawing shows a diagram of the device.

The DC electric drive contains an electric motor 1 and a power source 2 connected to a diagonal of a bridge circuit made up by switching contact groups 3-6 of four relays, the first inputs of control buses Forward 7, Back 8 are connected to the first terminals of windings 9 and 10, respectively, of the second and the first relay. Power supply 2 is connected to interconnected moving contacts of the indicated groups of the first 3, second 4, third 5, fourth 6, and electric motor 1 to the closing contacts of the specified groups of the first 3, third 5 and second 4, fourth 6

The second terminals of the windings of the second 9 and first 10 relays are connected to the break contacts of the contact groups of the first 3 and second 4 relays. The opening contacts of groups of the third 5 and fourth 6 relays are connected. To the first terminals of the windings of the fourth 11 and third 12 relays. The second terminals of the windings of relays 11 and 12 are connected via additional closing groups 13. and 14 of the first and second relays 10 and 9 to the common point of the moving contacts of groups 3 and 4 of the first and second relays 10 and 9 with the power source 2.

The electric drive also contains the second control bus inputs Forward 15, Back 16, fifth and sixth relays and two diodes 17 and 18. Windings 19 and 20 of the fifth and sixth relays are connected to the electric motor 1 through the indicated diodes 17 and 18 connected to the opposite direction of conduction. The second inputs of control units Forward 15 and Back 16 are connected to their first inputs 7 and B via break contact groups 21 and 22 of the fifth and sixth relay.

The device works as follows.

When the input signal is fed to the first input 7 of the bus Forward (corresponds to the forward running of the engine), the second relay 9 is activated. In this case, its switching contacts are closed.

In group 4, one bridge arm is switched on and the third relay 12 is activated, the switching contacts of group 5 turn on the second arm: the rest circuit, and the electric motor 1 will rotate in forward mode. If it is necessary to reverse the engine, the signal is disconnected from input 7 and fed to the first input 8 of the bus Back. In this case, the first relay 10 will work only when the opening contact of group 4 is fully closed, and the fourth relay 11 - only when the contact of group 5 opens completely and the additional closing contact of group 13 of the first relay 10 is open. Similarly, the circuit also works transition from Back to Forward. In this case, the relay of the second arm of the bridge circuit is similarly operated.

If it is impossible to reverse the motor until it stops, control is given to its second tire inputs Forward, Backward. In this case, the command to the opposite direction of rotation is blocked by means of the opening contact group 21, (22) of the fifth or sixth relay, the winding of which remains energized during braking of the electric motor due to its EMF. The relay winding circuit also contributes to the braking of the electric motor.

Claims (2)

Invention Formula one . A DC motor containing a motor and a power source connected to a diagonal of a bridge circuit made up of four relay relay contact groups, the first inputs of the Forward, Backward control units are connected to the first windings of the second and first relays, respectively, In order to maintain reliability, the power source is connected to the interconnected movable contact of the specified groups of the first, second, and respectively third, fourth, and the electric motor - to the short The main contacts of the indicated groups of the first, third, and respectively the second, fourth relays, the second leads of the windings of the second and first relays are connected to an open switch 3 13653154 contacts of the indicated groups of the corresponding 2. The actuator according to claim 1, concerning the first and second relays, in which the disconnecting contacts of the indicated groups additionally input the second inputs of the third and fourth relays - g control buses Forward, Back, to the first terminals of the windings, respectively the fifth, sixth relay and two diodes, essentially the fourth and third rewind windings of the fifth and sixth relays, the second terminals of which are connected to the electric motor through the additional inputted connecting diodes The opposite direction of the conductive and second relays is connected to the field, the second bus inputs of the control point of the moving contacts of the Forward, Back groups are connected to their first and second relays with the source to the first inputs through the disconnecting terminals. tact troupe. nth and sixth relays.