SU1334345A1 - Electric drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used in drives of various mechanisms. The purpose of the invention is to increase the reliability and expand the scope. This goal is ensured by the ability of the control unit to operate the reversing contactor in alternating and direct current circuits. 2 Il.

Description

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

The purpose of the invention is to increase the reliability and expand the scope of

Fig. 1 shows the electrical circuit diagram of the electric drive; FIG. 2 shows a control unit for a thyristor switch;

The electric drive contains a three-phase asynchronous electric motor 1, a reversing contactor 2 Forward and a contactor 3 Back connected to one phase terminal of the stator winding, the other terminals of which are connected to the thyristor switch .4 triangularly configured, switch thyristor unit 5 of the switch 6 monitor the state of the thyristors of the switch.

The switch thyristor control unit 5 contains diodes 7–9, connected via a zero-rectifying circuit, to the control electrodes of the thyristors of the thyristor switch 4, resistors 10–12, connected in series with diodes 7–9, respectively, and make 13 of the auxiliary relay.

The switch thyristor state control unit 6 contains diodes 14-165 anode outputs that form the input of block 65 and the cathodes of diodes 14-16 are combined and connected via series-connected resistors 17 and 18 are connected to one terminal of the coil 19 of the control relay, bypass capacitor 20, Another terminal of the coil 19 the control relay is connected to the common bus 21,

The reversing cocaacon control unit contains a series-connected disconnecting contact 22 of the control relay, a closing contact 23 of the reversing contactor coil Forward, an opening contact 24 of the reversing contactor coil Back and a coil 25 reversing contactor Forward, the other output of the latter is intended to be connected to a single phase 26 of the power supply . The block also contains series-connected alternating contact 27 of the coil of the reversing contactor. Back disconnecting contact 28 of the coil of the reversing contactor. Forward and coil, 29, reversing contactor.

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another terminal of the coil 25 of the reversing contactor Forward. Another output of the closing contact 27 of the reversing contactor coil. Back is connected to one output of the normally open contact 22 of the control relay. The other terminal of the latter is intended to be connected to a different phase 30 of the power supply. The unit includes parallel-connected make contacts 31 and 32 of the coils of the reversing contactor Forward and Back, respectively, some of the outputs of which are connected to one output of the normally open contact 22 of the control relay. The other terminals of the contacts 31 and 32 are connected to the same terminals of the parallel-connected make contacts 33 and 34 of the control relay and the auxiliary relay, respectively. Other outputs of contacts 33 and 34 are connected via series-connected coils of auxiliary relay 35 and button 36 5 Stop with another output of coil 29 of reversing contactor Back. One pin of the Forward button 37 is connected, with another pin of the break contact 22 of the control relay. The other 0 output is connected to one, the output of the opening contact 24. One output of the button 38 Back is connected to one output of the Forward button, the other output is connected to one output of the opening contact 28 of the Forward reversing contactor coil.

Electric drive for: reverse control of a three-phase asynchronous electric motor running as follows.

In the initial state, the coils of the contactors and relays in the circuit are de-energized. Pressing the Forward button closes its contact 37, as a result of which current flows through the next circuit; power supply phase 30 pin 37 of the Forward - Disconnect button; i contact pin 24 Back of the reversing contactor - coil 25 Forward of the same contactor - phase 26 of the power supply.

The reversing contactor operates in the Forward direction, the power contacts of the contactor 2 are closed, pins 23 and 31, and an open-circuit contact 28. At

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a half-wave current of the three phases of the network, rectified by diodes 14-16 of unit 6, flows through the windings of the electric motor 1,

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From the cathode point of these diodes through the resistors 17-18 and the coil 19 of the control relay, the rectified current flows to the zero bus 21, the control relay trips, the contact is closed 33 and the contact 22 is open (figure 2).

Through the KZ-Tuiguku auxiliary relay, a current begins to flow along the bare circuit of the power supply source 30 — pin 37 of the Forward button — contacts 23 and 31 of the forward reversing contactor — contact 33 of the relay-control — coil 35 of the auxiliary relay — break contact 36 of the Stop button - phase 26 power supply.

When activated, the auxiliary relay closes its first closing contact 34, shunt the contact 33 to the control relay, and the second closing contact 13 in the thyristor control unit 5 turns on the thyristor switch 4 o The electric motor starts.

When the thyristor switch is turned on, the diodes 14–16 in control unit 6 are shunted. Therefore, the coil 19 of the relay controls the power supply. Contact 22 of this relay is closed, and contact 33 is opened. From this moment on, the Forward button can be released, since the contact of the control circuits of the contactor and the auxiliary relay with the supply phase 30 is provided in this case via contact 22 of the control relay.

To ensure arc-less switching when the motor is stopped, the Stop button is pressed, the opening contact 36 of which breaks the power supply circuit and the coils 35 of the auxiliary relay connecting the thyristor switch. Turning off the thyristor switch causes, on the one hand, the motor to stop, and on the other, the switching on of the control relay, the opening contact 22 of which turns off the reversing contactor.

The operation of the circuit when starting the motor in the Back direction is not fundamentally different from the specified

Thus, the reversing contactor control unit can operate in alternating and direct current circuits.

Claims (1)

Invention Formula Electric drive containing a three-phase asynchronous motor. 0 five five reversing contactor connected to one phase terminals of the stator winding, other terminals of which are connected to a thyristor switch, made in a triangular pattern, switch thyristor control unit, switch thyristor state control unit, the input of which is connected to other phase terminals of the stator winding, reversible contactor control unit , made in the form of series-connected disconnecting contact of the control relay, closing contact of the reversing contactor coil Forward, disconnecting end tact of the catutl of the reverse contactor Back and the coil of the reverse contactor Forward, the other output of which is designed to connect to the same phase a power source, connected in series with the closing contact of the coil of the reverse-HoVo contactor Back, the locking contact of the coil of the reverse contactor Forward and the coil of the reverse contactor Back, another output which is connected to another terminal of the reversing contactor coil Q Forward, another output of the closing contact of the reversing contactor coil. Back is connected to one contact of the open contact of the control relay, the other pin of which is intended to be connected to another phase of the power source, parallel connected closing contacts of the control relay and auxiliary relay connected in series with the coil of the auxiliary relay and two contact reversing contactors Back and Forward, characterized in that, in order to increase reliability and expand the field of application, The asynchronous electric motor is made one-winding, the Forward, Back and Stop buttons are inserted into it, the first steps of the Forward and Back buttons are connected to another output of the control relay disconnecting contact, and the second steps of the Forward and Back buttons are connected to one of the open contact contacts of the reversing contactor Back and Forward respectively  the first output of the Stop button is connected to another output of the reverse contactor coil Back, and the other output of the Stop button is connected to another five 0 five 0 513343456 On the coil side of the auxiliary relay, included between the closing contacts are the closing contacts of the coils, the control and reverse relays and the auxiliary forward and backward contactor, the relay and one output terminal connected in parallel between and five control relay contact Figure 1 SCHSCH 9 FIG. 2 & zr 3S 6 0-tsm Compiled by V.Graponov Editor I.Kasarda Tehred M.Hodanich Proofreader I.Musk Order 3977/55 Circulation 659Subscription VNIIPI USSR State Committee  for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Proektna St., 4