SU1534711A1 - Two-motor electric drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used in electric drives of general industrial mechanisms. The purpose of the invention is to increase reliability by reducing the number of contact elements. This goal is achieved by turning on the coils 15, 18 and 21 of the auxiliary contactors in a "triangle" scheme and connecting the vertices of this triangle to the phases of the asynchronous motors 1 and 2 through the appropriate break contacts 16, 19 and 20. 1 sludge.

Description

The invention relates to electrical equipment and can be used in electric drives of general industrial mechanisms.

The purpose of the invention is to increase reliability by reducing the number of contact elements.

The drawing shows a schematic diagram of the drive.

The drive contains two three-phase asynchronous motors 1 and 2, three control keys 3-5 without self-return, a first power contactor with a coil 6 and three closing contacts 7-9, a second power contactor with a coil 10 and four closing contacts 11-14, the first auxiliary contactor with coil 15, opening and closing contacts 16 and 17, respectively, a second auxiliary contactor with coil 18, opening and closing contacts 19 and 20, respectively, a third auxiliary contactor with coil 21, opening contact Act 22 and closing contacts 23 hours 24. Some outputs of the three control keys 3-5 are provided with clips intended for connection to the Power supply, other outputs of control keys 3-5 through the corresponding connectors 7–9 and 11–13 of the first and second power contactors are connected to the phases of the stator windings of electric motors 1 and 2, respectively. One output of Coil 6 is connected to another output of the first control key 3, the other output of Katuiki 6 is connected to one output of the fourth make Contact 14 of the second power contactor and make contact 17, the other output of the fourth make contact 14 is connected to one output of the first make contact 24. One the output of the coil 10 is connected to another output of the first control key 3, the other output of the coil 10 is connected to the terminals of contacts 14 and 17. Some of the windings of the coils 15 and 21 are combined and connected via disconnecting contact 16 to another By the output of the first control key 3. One output of coil 1 8 and the other output of coil 21 are combined and through the disconnecting contact 22 of the first auxiliary contactor are connected to another output of the third control key 5, the other outputs of coils 15 and 18 are combined and

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the cut opening contact 19 is connected to another output of the second control key 4, the other terminals of the closing contact 17 and the closing contact 24 are combined and connected to another output of the third control key 5, the other terminals of the closing contact 20 and the closing contact 23 are connected and connected to another output of the second key 4 controls

The drive works as follows.

In the initial state, the control keys 3-5 are open, the coils 6, 10, 15, 18 and 21 of the contactors are de-energized, the electric motors 1 and 2 are disconnected. When the control switches 3 and 4 are closed, the coil 15 of the first auxiliary contactor is energized via the circuit: key 3, contact 19, coil 15 of the contactor, contact 22, key 4. The first auxiliary contactor will operate, open its contact 16 and close contact 17, When the contact opens 16, the supply circuit of the coils 18 and auxiliary contactors is broken. When contact 17 is closed, the connection circuit of the first power contactor is prepared. When the control key 5 closes, coil b of the first power contactor is energized along the circuit; key 3, coil 6 of the first power contactor, contact 17, key 5. The first power contactor will operate, close its contacts 7 9 by connecting the electric motor 1 to the power source. The disabling of the operating electric motor is performed by simultaneously opening the keys 3-5.

When the control keys 4 and 5 are closed, the coil 18 of the second auxiliary contactor is energized along the circuit; key 4, contact 22, coil 18 of the second auxiliary contactor, contact 16, key 5. The second auxiliary contactor will operate, open contact 19, break the power supply circuit of coils 15 and 21 of the first and third auxiliary contactors, and close contact 20, preparing the power supply circuit of coil 10 second power contactor

When the control key 3 closes, the coil 10 of the second power contactor is energized through the circuit: key 3, coil 10 of the second power contactor, pin 20, key 4. The second power contactor will operate, close

its contacts 11-14, connecting the electric motor 2 to a power source. Switching off the operating electric motor 2 is performed by simultaneously opening the control keys 3-5.

When the control switches 3 and 5 are closed, the coil 21 of the third auxiliary contactor is energized via the circuit: key 3, contact 19, coil 21 of the third auxiliary contactor, contact 16, key 5, The third auxiliary contactor will operate, open the contact 22, thereby breaking the coil supply circuit 15 and 18 of the first and second auxiliary contactors, respectively, and will close the contacts 23 and 24, preparing the connection circuit of the coils 10 and 6, respectively, of the second and first power contactors.

When the control key 4 is closed, the coil 10 of the second power contactor is supplied via the following circuit: key 3, coil 10 of the second power contactor, contact 20, key 4. The second power contact will operate, close its contacts I - 13, connect the electric motor 2 to power supply, and contact 14, supplying power to the coil 6 of the first power contactor on the circuit: key 3, coil 6 of the first power contactor, contact 14, contact 24, key 5, The first power contactor will operate and close its contacts 7-9, connecting the electric motor 1 to the power source. The successive switching on of electric motors 1 and 2 improves the starting conditions. The disabling of the working motors J and 2 is made by simultaneously opening the control keys 3-5.

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opening and closing contacts, a third auxiliary contactor with a coil, one opening and two closing contacts, one terminals of three control keys are provided with terminals for connection to a power source, other terminals of control keys are connected to stator phases via three respective terminals of the first and second contactors motor windings, one output of the coil of the first power contactor is connected to another output

15 of the first control switch, another output of the coil of the first power contactor is connected to the same terminals of the fourth closing contact of the second power contactor and the closing

20 of the contact of the first auxiliary contactor; another terminal of the fourth closing contact of the second power contactor is connected to one terminal of the first closing contact of the third

25 of the auxiliary contactor,

one output coil second power

the contactor is connected to another terminal

the first control key, the other you, the waters of the coil of the second power contact of the torus are connected to one of the terminals 35

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giving the contact of the second auxiliary contactor and the second closing contact of the third auxiliary contactor, differs from and in order to increase reliability by reducing the number of contact elements, one terminals of the windings of the first and third auxiliary contactors are combined and connected through the opening contact of the second auxiliary contact a contact with a different terminal of the first control key; one terminal of the coil of the second auxiliary contactor; and

The simplification of the circuit and the increase in reliability of the VIV ° D coils of the third auxiliary component are the advantages of the pre-contactor combined and

Claims (1)

electric drive (Formula of the invention Two-motor electric drive containing two three-phase asynchronous gQ i electric motors, three keys of control without self-return, the first power | a contactor with a coil and three make contacts, a second power contactor with a coil and four make contacts; 55 OTHER output of the second key control contacts, a first auxiliary, other leads of the closing contactor with a coil opening contact of the first auxiliary terminal, and closing contacts , the second auxiliary controller and the first closing contact of the contactor with the coil, the cycle of the third auxiliary terminal through the opening contact of the first auxiliary contactor is connected to another terminal of the third control key, the other terminals of the coils of the first and second auxiliary contactors are combined and through the break contact of the third auxiliary contactor are connected to 71534711-8 the tactics are combined and connected to the secondary contactor and the closing contact to the third output key of the second auxiliary contact; the other outputs of the second closing contact are combined and connected to the other-1 contact of the third auxiliary to the output of the second control key.