SU1374383A1 - Device for controlling reversible electric motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used in electric drives of conventional mechanisms. The purpose of the invention is to reduce energy consumption. This goal is accomplished by switching the limit switches 19 and 20 of the current limiting resistor 21 in series with the opening contacts. When any of the limit switches 19 and 20 are triggered, the device is disconnected from the power source and does not consume active energy, which is especially important during long stops : this electric drive. 1 il.

Description

oe -j

her

00 od

The invention relates to electrical engineering and can be used in electric drives of conventional mechanisms.

The purpose of the invention is to reduce energy consumption.

The drawing shows a diagram of the device.

The device for controlling the reversing electric motor contains two actuators, one winding leads of coils 1 and 2 of which are connected to one output of the Stop control button 5 via disconnecting contacts 3 and 4 of the opposite starters, the other end of which is provided with a clamp 6 for connecting to one output of the power source, the other leads of the windings of the coils 1 and 2 of the starters are connected through the corresponding opening contacts 7 and 8 of the Forward and Back buttons and through a triac 9 are provided with a clip 10 for connecting to another output of the power source and through the first capacitor 11 is connected to the anode of the diode 12, the cathode of which is connected to the anode of the Zener diode 13 and through the second capacitor 14 with one output of the Stop button 5, the cathode of the Zener diode 13 is connected to the terminal 10 for connecting to the second phase of the power source, one terminal pins 15 and 16 of the control buttons Forward and Back, interlocked with the opening contacts 7 and 8 of the buttons, are combined into a common point

and through the closing contacts 17 and 18 of the starters, respectively, are connected to other outputs of the closing contacts 15 and 16 of the Forward and Back control buttons, with one end of the limit switches 19 and 20, made opening, the other outputs of which are combined, the resistor 21, one of which is connected to the anode of the diode 12, another pin of the resistor 21 is connected to the common connection point of the limit switches 19 and 20.

The device works as follows.

When the supply voltage is applied to the terminals 6 and 10 of the alternating current source prior to the voltage falling on the zener diode 13, the filter capacitor 11 is charged through diode 12. If the drive mechanism is in such a position that the end contacts of the

5 0 5 0 s

0 5

Q

Since key switches 19 and 20 are closed, when the first button is pressed, its contact 8 opens, and contact 16 also closes through the cathode-triac switching triac 9 electrode, contact 16 of the control button, limit switch contact 20, the resistor 21 flowing current under the action of voltage the capacitor 11. This current triggers unlocking of the triac 9, through which both contacts 3 and 7 and the winding of the coil 1 current flows: the triggering operation of the magnetic starter. With its contact 18, the magnetic starter shunts contact 16 and self-holds in the on state and after opening the contact 16 of the button, and the opening contact 4 prevents simultaneous switching on the first button of the coil 2 after closing the contact 8 of the coil 2 with power contacts (not shown) The direction of movement of the mechanism. When, under the action of a mechanism, the contact of one limit switch 20 is opened, the control electrode of the triac 9 is disconnected from the voltage source, the triac closes and the coil 1 is disconnected, the power contacts open and the contact 18, and closes its contact 4. The electric motor stops. As long as the contact of the switch 20 is open, it is impossible to turn on the electric motor in the forward direction of movement of the mechanism using the contact 15 of the button. When the contact 15 of the second button is closed, the second control circuit of the triac 9 closes. In this case, the transition of the triac cathode to the control electrode 9, pin 15, the contact of the switch 19 and the resistor 21 flows through the voltage on the capacitor P, the triac opens again, since the contact 7 of the second button is now open, the coil 2 trips the circuit composed by the closed contacts 4 and 8, the motor reverses, contact 17 closes, shunt the contact 15 of the control button, and contact 3 opens, except for a temporary switch to the coil 2 of the coil 1. When opening the contact terminal 9 triac switch 19 is closed, the coil 2 is cut off and the motor is stopped.

The invention provides simplicity of circuit design and low power consumption.

Claims (1)

Invention Formula A device for controlling a reversible electric motor containing two actuators, one of the windings of the coils of which are connected to one output of the control buttons Stop through the opening contacts of opposite starters, the other output of which is provided with a clip for connecting to one output of the power source, the other conclusions of the windings of the actuators of the actuator through the corresponding disconnect The contacts of the Forward and Back buttons are combined through the sim symbol. provided with a clamp for connecting to another output of the power source and through the first capacitor connected to the anode of a diode, the cathode of which is connected not connected with the Zener anode and through the second capacitor with one output of the control button; Stop; the cathode of the Zener diode is connected to a terminal for connecting to the second phase of the power source, one terminal of the forward contacts of the Forward and Back buttons; 0 contacts of the same control buttons, combined into a common point and through the closing contacts of the corresponding starters are connected to the other terminals of the closing contacts of the Forward and Back buttons of the control buttons and one terminal of the limit switches, the other terminals of which are combined, a resistor, one LED of which is connected to the anode of the diode , it differs from the fact that, in order to reduce energy consumption, the limit switches are made break, another resistor lead is connected to the common connection point of the limit switches.