SU1742972A1 - D c reversible electric motor drive - Google Patents

Abstract

Use: in control units of electric motors of executive mechanisms. SUMMARY OF THE INVENTION: The electric drive comprises an electric motor 9, two four-channel setting signals 16, 17 two opening and two closing limit switches 12-15, and eight control relays 1-8. Due to the inclusion of the corresponding contact groups of the control relays in the motor power supply circuit and the use of limit switches, a high degree of reliability is achieved and the electric drive is operational with one possible malfunction such as failure of any command on one channel or the failure of any control relay or its contact. 1 il.

Description

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The invention relates to electrical engineering and can be used in control devices for electric motors of executive mechanisms.

A device for reversing the inclusion of a DC motor is known, comprising eight relays with two switching contacts each, a power source, and a dynamic braking resistor.

A disadvantage of the known device is the impossibility of its use in the presence of self-disconnecting contacts in the circuit of the electric drive.

The closest in technical essence is a reversible electric drive containing an electric motor connected to a power source in a cross-circuit through two closing and two opening contacts of the first relay, the winding of which is connected to one output terminal of the power supply and the other output terminal the first limit switch with a different output of the power source, to the terminals of which the winding of the second relay is connected through a second limit switch. In addition, it additionally introduced the opening contact of the second relay and the closing contact of the first relay, which bypasses the first limit switch connected to the winding of the first relay through the opening contact of the second relay.

The disadvantage of this technical solution is low reliability, due to the fact that the device is inoperable with one malfunction.

The aim of the invention is to increase reliability.

The goal is achieved by the fact that a reversible DC motor containing an electric motor, two control relays, the second winding terminals of which are connected to one of the power buses, the closing and opening end contacts, are entered into two four-channel signal adjusters, the second short circuit and the second opening limit contacts and six additional control relays, with two groups of switching contacts each, the outputs of the first four-channel signal setting device are connected to the first terminals of the first, W cerned, third and fourth relays and outputs of the second - to first terminals of said fifth, sixth, seventh and eighth switch, the second terminals of the third, fourth, fifth, sixth, seventh and eighth switch connected to the first power supply bus, the first

motor terminal is connected to fixed closing contacts of the second switching contact groups of the seventh and eighth relay and first closing contact contacts, the second terminals of which are connected to fixed closing contacts of the above contact groups, respectively, the moving contact of the second switching contact group of the seventh relay is connected to the first power bus through series-connected closing contact of the first switching contact group of the third relay and opening the contact of the first switching contact group of the seventh relay, and with the second power bus through a sequentially connected disconnect contact of the first switching contact group of the third relay and the closing contact of the second switching contact group of the fifth relay; the moving contact of the second switching contact group of the eighth relay is connected to the first power bus sequentially connected closing contact of the first switching contact group of the fourth relay and the breaking contact of the first switching contact group of the eighth relay, and with the second power bus through serially connected disconnecting contact of the first switching contact group of the fourth relay and closing contact of the second switching contact group of the sixth relay; the second terminal of the electric motor is connected to the fixed closing contacts of the second switching contact groups of the first and second relay and with the first conclusions of the opening end contacts, the second terminals of which are connected to the fixed break contacts of the above-mentioned contact respectively, the moving contact of the second switching contact group of the first relay is connected to the first power bus through a series-connected closing contact of the first switching contact group of the fifth relay and disconnecting contact of the first switching contact group of the first relay, and to the second power bus through a series-connected break contact of the first switching contact relay group and the closing contact of the second switching contact group of the fourth relay, the second contact The second switching contact of the second relay is connected to the first power supply bus through a serially connected closing contact of the first switching contact group of the sixth relay and the disconnecting contact of the first switching contact group of the second relay, and to the second power bus through a serially connected break contact of the first switching contact group of the sixth relay make contact of the second switching contact group of the third relay.

A positive effect in implementing the invention is achieved by introducing two four-channel signal adjusters, second closing and opening end contacts, and new connections.

The drawing is a diagram of the proposed electric drive.

The device contains a relay 1-8 control with the same switching contact groups 1-1, 1-2, 2-1, 2-2, 3-1,4-1,5-1,6-1,7-1,7- 2.8-1.8-2, respectively, the electric motor 9, the power bus 10, 11, the closing end contacts 12, 13, the closing end contacts 14.15, two four-channel setters 16.17 signal a.

The 4-channel signal setting unit is any known signaling device that provides signals on four independent channels, for example, four toggle switches that independently connect the second power bus 11 to the relay inputs 1, 2, 3, 4 (5, B, 7.8 ). In addition, a four-channel power source can be obtained from a three-channel (A, B, C) source. In this case, the fourth channel can be obtained from the three existing by the known formula.

The first brush of the electric motor 9 is connected to the fixed closing contacts of the second switching contact groups of the seventh relay 7-2 and the eighth relay 8-2 and the first terminals of the open end contacts 12, 13, the second terminals of which are connected to the fixed opening contacts of the specified contact groups. The movable contact of the second switching contact group of the seventh relay 7-2 is connected to the first power supply bus 10 through the series contact of the first switching group of the third relay 3-1 and the break contact of the first switching contact group of the seventh relay 7-1, and to the second power supply bus 11 through a series-connected disconnecting contact of the first switching contact group of the third relay 3-1 and the closing contact of the second switching contact group of the fifth relay 5-2. Moving contact

The second switching contact group of the eighth relay 8-2 is connected to the first power supply bus 10 via the serially connected make contact of the first switching contact group of the fourth relay 4-1 and the break contact of the first switching contact group of the eighth relay 8-1, and to the second power supply bus 0 via series connected break contact of the first switching contact group of the fourth relay 4-1 and the closing contact of the second switching contact group of the sixth relay 6-2.

5 The second power brush of the electric motor 9 is connected to the fixed closing contacts of the second switching contact groups of the first relay 1-2 and the second relay 2-2 and to the first terminals of the opening end contacts 14, 15, the second terminals of which are connected to the breaking contacts of the indicated contact groups, respectively.

The movable contact of the second switching contact group of the first relay 1-2 is connected to the first power supply bus 10 through the series-connected contact of the first switching contact group of the fifth relay 5-1 and disconnecting

0 contact of the first switching contact group of the first relay 1-1, and with the second power bus through a serially connected disconnect contact of the first switching contact group of the fifth relay 5-1

5 and the closing contact of the second switching contact group of the fourth relay 4-2. The movable contact of the second switching contact group of the second relay 2-2 is connected to the first power bus

0 through two series-connected closing contact of the first switching contact group of the sixth relay 6-1 and disconnecting contact of the first switching contact group of the second relay 2-1, and c

5 second power bus - through a series-connected disconnecting contact of the first switching contact group of the sixth relay 6-1 and the closing contact of the second switching contact group

0 fourth relay 4-2. The first 4-channel signal master is connected to the first terminals of the first, second, third, fourth relay, the second 4-channel signal master - to the first terminals of 5-8 relays. Second

The 5 pins of all relays are connected to the first power bus 10.

The device works as follows.

When a signal is supplied from the outputs of the second four-channel signal setting device 17 (forward stroke) to the first winding terminals

5-8 relays, the relays are triggered, and with their contacts of the same name they connect the measles of the engine 9 through the breaking end contacts 14, 15 to the power buses 10, 11. The motor rotates in one direction, moving to the appropriate side an actuator fitted with end contacts 12-15.

The movement of the mechanism occurs as long as the opening end contacts 14, 15 are open. In this case, the chain that feeds the bark will open and the engine (actuator) will stop. In this case, the end contacts 12, closed. The device is ready to receive the command Reverse. When a command is output from the outputs of the first four-channel source 16 of signals to the first terminals of windings 1-4 of the relays, the relays are turned on and with their contacts of the same name connect the motor pin to the power buses 10, 11 via closed end contacts 12, 13 in reverse polarity. The motor rotates and moves the actuator in the opposite direction before opening the end contacts 12, 13 (closing the end contacts 14, 15). The device returns to its original state.

The device works in case of any one malfunction (failure of the relay, command failure).

As shown by the circuit analysis and test results, the proposed device, compared with the prototype, provides a positive effect, which consists in increasing reliability by introducing two four-channel signal sensors, a second closing and a second tripping terminal, and new connections.

Claims (1)

Claims of the invention A reversible DC electric drive containing an electric motor, two control relays, the second terminals of the relay coils are connected to one of the power buses, closing and opening end contacts, characterized in that, in order to increase reliability, two four-channel for the signal sensor, the second closing and the second disconnecting terminal contacts and six additional control relays, with two groups of switching contacts each, the outputs of the first four-channel signal source connecting They are the same with the first terminals of the first, second, third and fourth relays, and the outputs of the second with the first terminals of the fifth, sixth, seventh and eighth relays, the second terminals of the third, fourth, fifth, sixth, seventh and eighth the relay is connected to the first power bus; the first terminal of the electric motor core is connected to the fixed closing contacts of the second switching contact groups of the seventh and eighth relays and the first conclusions of the closing end contacts, the second terminals of which are connected to the fixed disconnecting contacts of the above contact 0 groups, respectively, the movable contact of the second switching contact group of the seventh relay is connected to the first power bus through a serially connected closing contact of the first switching contact group of the third relay and the disconnecting contact of the first switching contact group of the seventh relay, and the second power bus through a sequentially activated break contact 0 of the first switching contact group of the third relay and the closing contact of the second switching contact group of the fifth relay, the moving contact of the second switching contact group of the eighth relay is connected to the first power bus through the serially connected contact contact of the first switching contact corpse of the fourth relay and the first contact switching contact 0 of the contact group of the eighth relay, and with the second power bus — through the sequentially connected disconnecting contact of the first switching contact group of the fourth relay and the closing contact of the second switching contact group of the sixth relay; the second terminal of the electric motor is connected to the fixed closing contacts of the second switching contact groups of the first and 0 of the second relay and with the first outputs of the opening limit contacts, the second terminals of which are connected to the fixed opening contacts of the above contact groups, respectively; the moving contact of the second switching contact group of the first relay is connected to the first power bus through the sequentially connected contact contact of the first switching contact group 0 fifth relay and disconnecting contact of the first switching contact group of the first relay, and with a second power bus through the disconnecting contact of the first switching contact of the fifth relay group and closing contact of the second switching contact group of the fourth relay, moving contact of the second switching contact group of the second relay connected to the first power bus via series-connected the closing contact of the first switching contact group of the sixth relay and the opening contact of the first switching contact group of the second relay, and with the second power bus through a sequential included break contact of the first switching contact group of the sixth relay and closing contact of the second switching contact group of the third relay.