SU1647827A1 - Device for controlling three-phase asynchronous motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used in electric drives of industrial mechanisms. The aim of the invention is to simplify, increase speed and reliability. If before starting the electric motor 1, the switch 6 is turned off, when the start button is pressed, the Start gets power to the coil 14 of the starting contactor via the circuit contact 3 of the switch 2 - contacts 13 and 14 of the switch 6 - the button 20 Start - the coil 15 - the button 21 Stop - contact 5 of the switch 2. The starting contactor operates and closes its contacts 16-19, while the starting contactor with the coil 15 is self-blocking. When the switch 6 is turned on, its corresponding contacts are closed and, since the contacts 16-18 are closed, the voltage is applied to the stator winding of the electric motor 1, it rotates in a direction that depends on the position of the switch 6. If before starting the electric motor 1, the contacts 7-12 of the switch 6 are closed, contacts 13,14 are open, i.e. Switch 6 is on, when the start button is pressed, the coil 15 3 of the starting contactor does not receive power and the starting contactor does not operate. In this way, (f) the device can be started f only when the switch 6 is off. 1 or 4

Description

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The invention relates to electrical engineering and can be used in electric drives of industrial machinery, with remote start protection.

The aim of the invention is to simplify, increase speed and reliability.

The drawing shows a diagram of the device.

The device for controlling a three-phase asynchronous electric motor 1 contains a switch 2 with three contacts 3-5, a switch 6 with eight contacts 7-14 (contacts 7-12 are closing, contacts 13 and 14 are opening), a starting contactor with a coil 15 and four closing contacts 16-19, 20 Start button, 21 Stop button, Some pins of contacts 3-5 of switch 2 are designed to connect the phases of the mains supply, others are connected to one pins of contacts 16-18 of the starting contactor, one pins of the first and fourth pins 7 and 10 of switch 6 united and connected to another output of the closing contact 16, one of the outputs of the second and fifth contacts 8 and

11switch 6 are combined and connected to another output of the closing contact 17, one terminals of the third 9 and sixth

12contacts of the switch 6 are interconnected and connected to another output of the closing contact 18 of the starting contactor, the other terminals of the first 7 and sixth 12 contacts, the second 8 and fifth 11 contacts, the third 9 and fourth 10 contacts of the switch 6 are pairwise combined and intended for connecting the winding phases stator of asynchronous motor 1, another pin of pin 3 through the circuit,

consisting of series-connected disconnecting contacts 13 and 14 of switch 6, start button 20, start-up coil coil 15, button 21 Stop, connected to the second output of contact 5, and a circuit consisting of series-connected contacts 13 and 14 of switch 6 and a button 20 Start, shunted by pin 19.

The device works as follows.

When the switch 2 is turned on, the voltage from the power source flows to the device. If before starting the motor 1, pins 7-12 are open, and pins 13 and 14 are closed, i.e. switch 6 is turned off, then when you press button 20, the Start is powered by the coil 15 of the starting contactor through the circuit of the contact 3 of the switch 2 - contacts 13 and 14 of the switch 6 - button 20 Start - coil 15 - button

21 Stop - contact 5 of switch 2. The starting contactor is activated and closes its contacts 16-19, while the starting contactor with the coil 15 is self-blocking. With

switching on the switch 6, its corresponding contacts are closed and, since the contacts 16-18 are closed, the voltage goes to the stator winding of the electric motor 1, driving it into rotation

0 direction, which depends on the position of the switch 6.

If before starting the electric motor 1, the contacts 7-12 of the switch 6 are closed, the contacts 13 and 14 are open, i.e. Since the switch 6 is on, then when the start button is pressed, the start-up coil 15 of the starting contactor will not receive power and the starting contactor will not operate.

Thus, the device can be started up only when the switch 6 is off, i.e. when its contacts 7-12 are open and contacts 13-14 are closed.

The invention is simple.

Claims (1)

5 circuit solutions, high speed, low power consumption of control circuits and higher reliability. The invention The device to control the three-phase 0 asynchronous electric motor, containing a switch with three contacts, a starting contactor with a coil and two closing contacts, a Start button, a switch with six contacts, one The 5 pins of the switch are designed to connect the phases of the mains, one pins of the first and fourth contacts of the switch are interconnected, one pins of the second and fifth contacts of the switch are combined and connected via the first closing contact of the starting contactor to another terminal of the first contact of the switch, some pins of the third and sixth pins switch 5 are combined and connected via the second closing contact of the starting contactor to the second output of the second contact of the switch, other outputs of the first and sixth, second and fifth, third and fourth 0 switch contacts are pairwise combined and are designed to connect the phases of the motor winding, so that, in order to simplify, increase speed and reliability, 5 a Stop button is inserted into it, the switch is additionally equipped with seventh and eighth make contacts, and the starting contactor has third and fourth make contacts, the junction point of one of the first and fourth contacts Combi switch through the third closing switch, bypassing the fourth contact of the starting contactor by the closing contact of the contactor, under-. To another output of the third contact is connected to another output of the third contact of the switch, the first output of the coil of the start-5 switch, the second output of the coil of the starting contactor through the circuit composed by the contactor through the Stop button connect the serially connected buttons to the other output of the second contact of the Start, seventh and eighth contacts ne-switch.