SU1339845A1 - Control device for three-phase induction motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used in reversible electric drives with remote control. The aim of the invention is to expand the scope of use by using for reversible electric motors. The goal is achieved by introducing a second contactor of the opposite direction of rotation and a second Start button. The start buttons are made with closing and opening contacts, the relay is equipped with a second closing contact, due to which the device can be used to control the reversible electric drive using one relay that blocks the start button with its contacts for both directions of rotation of the electric motor. In this connection, the connection between the control panel and the electric motor can be carried out along three wires. 1 il. oo with so 00 4 pr

Description

The invention relates to electrical engineering and can be used in reversible electric drives with remote control.

The purpose of the invention is to expand the scope of use by using for reversible electric motors.

The drawing shows a schematic diagram of a device for controlling a three-phase asynchronous motor.

The device contains a first contactor with a coil 1 with three closing contacts 2-4 and a disconnecting contact 5, one outputs of contacts 2-4 are provided with clamps for connection to a power source, and others are intended for connection to the outputs of the phases of a stator winding of an electric motor, one output of a coil 1 contactor is connected to one output of the first end of its contact 2, the relay with the coil of the third end contact 4 of the first contactor.

The device works as follows. In the initial state, pins 2, 3,

5 4, 7, 8, 10, 13, 14, 15 and 17 are open, and the electric motor is disconnected from the power source. When the first button is pressed, the Start is opened contact 9 and the contact 10 is closed. The coil of the first contactor 1 will receive power through the circuit: source 10 - tannin - coil 1 - contacts 16 and 10 - coil b - contact 11 - power source. The first contactor will operate, close the contacts 2-4, energizing the stator winding circuit of the electric motor, and again. button contact 5, breaking the supply circuit of coil 12 of the second contactor. Since the current flowing through the coil 1 of the first contactor also flows through the Katunky 6 relay, the latter will operate and close its contacts 7 and 8. The Contact 7 of the relay through

6 and the closing contacts 7 and 8, the first 20 closed opening contact 18, the second Start button with the opening 9 and the Start button closed, and the Opening contact 10 button of the first Start button,

with opening contact 11, one output. The closed contact 8 of the relay will not supply power to the coil 12 of the second contactor, since contact 9 of the first Start button and contact 5 of the first contactor is open. When the first “Start” button is released, its contact 10 is opened, but the coil of the first contactor will remain on, as contacts 7 of the relay and 18 second are closed

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the coil 6 relay is connected to one output of the disconnecting contact 11 of the button “Stop, another lead of the coil 6 of the relay is connected to one output of the closing contact 10 of the first“ Start ”button and to one output of the closing contact 7 of the relay, the second contactor with the coil 12 with three closing contacts 13- 15 and the disconnecting contactor m. 16, one terminal of the closing contacts 13-15 of the second contactor are connected respectively to one terminal of the closing contacts 4, 3 and 2 of the first contactor, the other terminals of contacts 13-15 are connected respectively to the other terminal closing 2-4 first contactor contacts, one terminal katuschki second contactor 12 is connected to one terminal of Ka 1 tkschki first contactor katu1pek other terminals 1 and 12 of the first and second kontaktoknopki "Start. The closed contact 9 30 of the first start button will not supply power to the coil 12 of the second contactor, since contact 5 of the first contactor is open.

The motor is switched off by briefly pressing the "Stop. In this case, the power supply circuit of the coil 6 of the relay and the coil 1 of the first contactor is broken, which, having turned off, open the contacts 2, 3, 4, 7 and 8. The otr motor is connected to one of the power supply and disconnecting contacts 6 and 5 respectively. the second and first contactors, the second button with the closing 17 and opening 18 contacts, connected in series by the quantizing contact 9 of the first button “Start and the second closing contact 8 of the relay. 45 are closed by the closing contact 17 of the second button“ Start and the output of the coil 6 of the relay and another output of the opening contact 5 of the first contactor, another output of the first closing contact 7 of the relay is connected to one output of the opening 18 of the second Start button, other conclusions of the closing contact 10 of the first Start button and the opening contact 18 of the second button “The start is combined and connected to another output of the disconnector, its contact 16 of the second contactor, another output of the opening contact 11 of the button“ Stop connected to one of the 50

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The property will return to its original state. When the first contactor is disconnected, its contact 5 closes, preparing the circuit to turn on the second contactor.

Switching on the electric motor for rotation in the opposite direction is carried out by pressing the second Start button. At the same time, the contact 18 is opened and the contact 17 is closed. The coil of the second contactor will receive power through the circuit: power source - coil 12 - contacts 5 and 17 - cathode 6 - contact 11 - power source. The second contactor will operate, close the contacts 13-

15, applying power to the stator circuit of the electric motor, and opens the contact

16, breaking the power circuit of the coil of the first contactor. Since the current flowing through the coil of the second contactor also flows through the coil of the relay 6, it is the last of the third closing contact 4 of the first contactor.

The device works as follows. In the initial state, pins 2, 3,

5 4, 7, 8, 10, 13, 14, 15 and 17 are open, and the electric motor is disconnected from the power source. When the first button is pressed, the Start is opened contact 9 and the contact 10 is closed. The coil of the first contactor 1 will receive power through a circuit: a source of tannin - a coil 1 - contacts 16 and 10 - a coil b - contact 11 - a power source. The first contactor will operate, close contacts 2-4, energize the stator winding circuit of the electric motor, and open contact 5, breaking the power supply circuit of coil 12 of the second contactor. Since the current flowing through the coil 1 of the first contactor also flows through the Katunky 6 relay, the latter will operate and close its contacts 7 and 8. The Contact 7 of the relay through

0 closed disconnecting contact 18 of the second start button shunts the closure of the closed contact 8 of the relay will not supply power to the coil 12 of the second contactor, since contact 9 of the first start and contact 5 of the first contactor is open. When the first “Start” button is released, its contact 10 is opened, but the coil of the first contactor will remain on, as contacts 7 of the relay and 18 second are closed

Start button. The closed contact 9 30 of the first start button will not supply power to the coil 12 of the second contactor, since contact 5 of the first contactor is open.

The motor is switched off by briefly pressing the "Stop. In this case, the power supply circuit of the coil 6 of the relay and coil 1 of the first contactor is broken, which, having switched off, open the contacts 2, 3, 4, 7 and 8. Electric motor from 5

0

five

The property will return to its original state. When the first contactor is disconnected, its contact 5 closes, preparing the circuit to turn on the second contactor.

Switching on the electric motor for rotation in the opposite direction is carried out by pressing the second Start button. At the same time, the contact 18 is opened and the contact 17 is closed. The coil of the second contactor will receive power through the circuit: power source - coil 12 - contacts 5 and 17 - cathode 6 - contact 11 - power source. The second contactor will operate, close the contacts 13-

15, applying power to the stator circuit of the electric motor, and opens the contact

16, breaking the power circuit of the coil of the first contactor. Since the current flowing through the coil of the second contactor also flows through the coil of relay 6, the latter operates and closes its contacts 7 and 8. Contact 8 of the relay through the closed disconnecting contact 9 of the first button “Start-up bypasses the closing contact 17 of the second button "Start. The closed contact 7 of the relay will not supply power to the coil 1 of the first contactor, since contact 18 of the second Start button and contact 16 of the second contactor is open. When releasing the second button “Start, open its contact 17, but the coil of the second contactor will remain on, as the contact 8 of the relay and contact 9 of the first button“ Start. The closed contact 18 of the second Start button will not supply power to the coil 1 of the first contact of reversible electric motors, a second contactor with a coil, with three locking contacts and one open contact, is inserted into it, the second button Start with closed and open contacts , the first contactor is provided with an opening contact, the relay is equipped with a second closing contact, one of the first, second and third closing contacts of the second contactor is connected respectively to the same third, second and first short-circuiting terminals The contacts of the first contactor, the other terminals of the first, second and third closing contacts of the second contactor are connected respectively to other

ten

torus, since contact 16 of the second is opened by 5 pins of the first, second and third contactors.

Claims (1)

 The invention The device to control the three-phase The first contacts of the first contactor, one lead of the second contactor coil are connected to one lead of the first contactor, the other coils of the first and second contactors are connected to an asynchronous electric motor, each containing 20 contacts of the opening contact of the neck to the second and first coils. contactors, consecutive contacts, some of the terminals of which are normally connected disconnecting contacts are equipped with clamps for connection to the first Start button and the second close to the power source and the other intended-contact relays are bypassed by closing are connected to the phase terminals of the stator-contact of the second button “Start and on An electric motor winding, one output 5 Between the other output of the relay coil and the other contactor coil is connected to one high output of the normally open contact by the first closing contact, the contact contactor, the other first pin by the coil and the closing contact, the relay contact is connected to by one “Start” with a closing contact output of the second contact volume, the button “Stop with a disconnecting junction button —JQ of the Start button, other conclusions of the closing cycle, one output of the coil of the connecting pin of the first button” is started and blurred with one output of the opening contact of the Stop button, the other output of the button of the relay is connected to one output of the closing contact of the start button and with one output of the closing contact of the relay, characterized in that, in order to expand the application area by using 35 the tactile contact of the second Start button is combined and connected to another output of the second contact of the second contactor, another output of the open contact of the Stop button is connected to one output of the third closing contact of the first contactor. for reversible electric motors, a second contactor with a coil is inserted into it, with three locking contacts, one of them and one open contact, the second button is “Start with closing and opening contacts, the first contactor is provided with an opening contact, the relay is equipped with a second closing contact, one terminals the first, second and third make contacts of the second contactor are connected respectively to the same terminals of the third, second and first make contacts of the first contactor, the other leads of the first, second and third contact contacts Comrades of the second contact are connected respectively to other the findings of the first, second and third locking35 the tactile contact of the second Start button is combined and connected to another output of the second contact of the second contactor, another output of the open contact of the Stop button is connected to one output of the third closing contact of the first contactor. Compiled by E. Pere.myslova Editor A. KozorizTechred I. VeresKorrektor N. Korol Order 4242/53 Circulation 659 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 1 13035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4