SU1164658A1 - Servo drive - Google Patents

Description

The invention relates to energy and can be widely used in mobile power units and electro-hydraulic installations driven by the internal combustion engine 5 as a mechanism for changing the speed and engaging the clutch.

The purpose of the invention is to improve the reliability of the servo drive by eliminating high shock loads that occur when the clutch coupling of a mobile electrical unit is turned on at unacceptably high speeds and stopping (starting) the internal combustion engine of the rolling

Electrical unit with clutch engaged.

FIG. 1 schematically shows an airfield mobile electrical unit, general view; in fig *. 2 - 20

circuit diagram of the servo.

FIG. 1 and 2 schematically depict automobile chassis 1, internal combustion engine 2, 25

tachometer 3, primary converter 4, rotational speed change mechanism 5, first motor 6, clutch 7, clutch 7 control mechanism 8, second motor 9, limit switch 10, transfer box 11, generators 12, control panel 13, control unit 14 , second and first switches 15 and 16, signal lamp 17, third switch 18, rectifier 19, first

2

(control) transistor 20, second (output) transistor 21, relay coil 22, opening and closing contacts 23 and 24 relays, diode 25, first and second variable resistors 2.6 and 27, second and first resistors 28 and 29, first and second capacitors 30 and 31, a source of 32 DC voltage, the fourth, third, first and second windings 33, 34, 35 and 36 of the excitation, the first contact group 37 of the limit switch 10, the winding 38 of the relay, the closing contacts 39 of the relay, the second contact group 40 of the limit switch 10 , the first and second anchors 41. and 42, the first and second terminals 43 and 44 and DC voltage source, the first-eighth terminals 45-52 of the control unit 14, the servo 53, the first and second. The contacts 54 and 55 of the third switch 18.

The aerodrome mobile unit contains a car chassis 1, an internal combustion engine 2, a speed change mechanism 5, a clutch 7, a clutch 7 control mechanism 8, a servo 53, transfer case 11 with generators 12 mounted on it and located in the driver’s cabin. remote control 13.

On the control panel 13, displayed

engine control panel 2

internal combustion tachometer 3,

the second, first and third switches 15, 16 and 18, warning light

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four

17 switching on the clutch 7 of the clutch, control panels and switching panels of the equipment of 12 generators.

The control unit 14 contains a rectifier 19, the first (control) 5 and the second (output) transistors 20 and 21, the relay coil 22, the opening and closing contacts 23 and 24 of the relay, the diode 25, the first and second variable resistors 26 and 2? and the second and first resistors 28 and 29, the first and second capacitors 30 and 31, terminals 45-52.

The servo drive 53 contains a tachometer 3 with a primary converter · 4, the first and second engines 6 and 9, the re: 15 switches 15, 16 and 18, the warning lamp 17, the constant voltage source 32, the relay coil 38, the closing contacts 39.

Electric motor 6 mechanism 5 20

change the number of revolutions of the engine 2 internal combustion contains the first anchor 41 and the fourth and third windings 33 and 34 of the excitation.

When voltage is applied to the fourth 25th excitation winding 33, the electric motor 6 converts the mechanism 5 changes in the number of revolutions in the direction of decreasing the number of revolutions of the engine 2 internal combustion, when applying voltage ^ 0 to the third overrunning 34, in the direction of increasing.

The electric motor 9 of the clutch control 7 mechanism 8 includes an armature 42 and the first and second excitation windings 35 and 36. When voltage is applied to the first excitation winding 35, the electric motor 9 converts the clutch control mechanism 8 · to the clutch 7 , and when the voltage is applied to the second excitation winding 36, the clutch 7 is activated.

On the electric motor 9 a limit switch 10 is installed, in the chain of the second contact group 40 of which a signal lamp 17 is installed,.

which lights up when the clutch 7 clutch. 50

Parallel to the opening and closing contacts of the relay 23 and 24 of the control unit 14, the second and first closing contacts 55 and 54 of the third switch are mounted.

The servo works as follows.

When the supply voltage from the source-. KA 22 DC voltage current passes through the emitter-collector circuit of the second transistor 21 and the winding 22 of the relay of the control unit 14.

In this case, the opening contacts 23 of the relay are opened, and the closing contacts of the relay 24 are closed. The movable contact of the first contact group 37 of the limit switch 10 is in the left position. The current passes through the winding. 38 relays, and make 39 contacts closed.

After the end of heating of the internal combustion engine 2, the second switch 15 supplies voltage to the fourth or third windings 33 or 34 of the excitation of the electric motor 9, which acts on the speed-change mechanism 5 so that the latter sets The speed of the engine 2 internal combustion is higher than the minimum stable, but lower than the maximum allowable for engaging the clutch 7. The value of the speed is controlled by the readings of the tachometer 3. The movable contact of the first switch .16 is set to the right position.

The voltage from the source 32 of the DC voltage is applied to the second winding 36 of the electric motor 9, the anchor 42 of which begins to rotate and drives the clutch control mechanism 8. The mechanism 8 controls the engagement of the clutch 7 clutch.

In addition, the armature 42 from the electric motor acts on the limit switch 10 in such a way that the movable contacts of its contact groups 37 and 40 are set to the right position. As a result, the warning lamp 17 lights up, the relay coil 38 de-energizes, the closing contacts 39 open. After the warning lamp 17 lights up, the engine speed 2 of the internal combustion engine increases to the nominal one. values, and the consumer is connected to the generator 12. If the number of revolutions is higher than the maximum allowable for safe switching on and off the clutch 7, the EMF is produced by the primary converter 4, reaches the value *

6

five

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the first (control) transistor 20, which is open enough for opening, and through its emitter-collector circuit, a positive potential is fed to the base of the second (output) transistor $ 21. The second transistor 21 is closed.

Winding 22 of the relay is de-energized. The opening contacts 23 are closed, and the closing contacts 24 are opened. In this condition of the circuits of the control unit 14, the engine speed 2 of the internal combustion engine can either be increased to the maximum allowable or reduced to the minimum stable 15 by controlling the electric motor 6 using the second switch 16..

The electric motor 9 cannot act on the clutch control mechanism 8 of the clutch 7 because 20 closing contacts 24 in the power supply circuits of its excitation windings 35 and 36 are open, the warning light 17 goes out.

By reducing the speed of the engine 2 internal combustion to a minimum of 25 stable EMF produced by the primary converter 4 is reduced. The first (control) transistor closes. The positive potential is removed from the base of the second (output) rear transistor 21, which opens, and the supply current of the winding 22 of the relay penetrates through its emitter-collector circuit.

The opening contacts 23 of the relay open ₃₅ and the closing contacts 24 of the relay close. The power supply circuit of the electric motor 9 is restored. The warning lamp 17 lights up.

In this state, the tripping ₄ θ

contacts 23 and closing contacts 39 in the power circuit of the fourth excitation winding 33 are open, which excludes the possibility of further reduction

engine speed 2 internal combustion and stop it. Closing the same contacts 24 in the power supply circuits of the windings 35 and 36 of the excitation of the electric motor 9 are closed and the clutch 7 can be turned off ,.

To turn off the clutch 7 clutch, you must move the movable contact of the first switch 16 to the left position. After the clutch 7 is turned off, the signal lamp 17 goes out, the moving contacts of the first and second contact groups 37 and 40 of the limit switch are set to the left position, voltage is applied to the winding 38 of the relay, the closing contacts 39 of the relay are closed, which close the excitation winding 33 of the motor 6.

All this leads to the fact that the engine speed 2 internal combustion can be reduced, and it can be stopped.

In the event of failure of the control unit 14, the disconnecting and closing contacts 23 and 24 of the relay of the control unit 14 are bridged using the closing contacts 54 and 55 of the switch 18, and the operation of the internal combustion engine 2 and the clutch 7 can only be controlled using the switches 15 and 16.

These distinctive features make it possible to approximately three times increase the reliability of the servo drive and increase the service life of the clutch, splined drive plate, transfer box input shaft, fan shaft, drive shaft of a generator of an airfield mobile electrical unit by 5.3 times due to shock loads.

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Claims (3)

1. SERVOPROVOD containing a tachometer connected to the outputs with · '· inputs of the primary converter, a DC voltage source connected by the first terminal to the first terminals of the first armature, a signal lamp and the second anchor connected to the first terminals and the second field windings, · connected by the second terminals respectively to the first and second terminals of the limit switch connected by the third terminal to the second terminal of the signal lamp, the fourth and the fifth pins with the first and second ⁷ pins of the first switch, and the control input with the second armature shaft, the second terminal of the DC voltage source is connected to the first output of the second switch ^ 'connected to the second output the output of the third excitation winding connected by the second output to the second output of the first armature and to the first output of the fourth excitation winding, characterized in that, in order to increase the reliability of the servo drive, it additionally has a control unit connected by the first and second terminals to the first and second terminals a constant voltage source, the third terminal to the second terminal of the fourth excitation winding, the fourth and fifth terminals to the third terminals of the second and first switches, sixth, seventh and res, respectively - 5 my terminals - to the outputs of the tachometer. 2. Servo drive according to claim. 1, different. the fact that it additionally installed a relay winding, closing relay contacts and. the third switch with closing contacts, the second terminal of the DC voltage source is connected to the third output of the first switch through the first closing contacts of the third switch, the third output of the second switch is connected to the second output of the fourth excitation winding via the second closing contacts of the third switch and through the closing contacts' of the relay, first The DC terminal is connected to the sixth terminal of the limit switch via a relay coil. 3. Servo on the PP. 1 and 2, characterized in that the control unit contains a rectifier connected to the first, second and third 30 ,,,, 1164658 1164658 terminals to the sixth, seventh and eighth terminals of the control unit; fourth terminal to the lining of the first capacitor; first terminals of the first and second variable resistors, diode, relay winding, closing contacts of the relay and the second terminal of the control unit; and the fifth terminal to the second terminal of the first variable a resistor connected by a movable output to the base of the first transistor connected by a collector to the base of the second transistor and to the first lead of the first resistor, and an emitter to the movable lead of the second variable resistor to the first the output of the second resistor and the first plate of the second capacitor connected by the second plate to the second terminals of the second resistor, the relay coil and diode winding and to the emitter of the second transistor connected by a collector to the second terminal of the first resistor and to the first terminal of the control unit, the third and fourth terminals of which are connected between by itself through the disconnecting contacts of the relay, and the fifth terminal - with the second output of the closing contacts of the relay. one