SU1259457A1 - Device for controlling induction electric motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used in electric drives of balancing machines with electric brakes. The purpose of the invention is to increase functional reliability. To achieve this goal, a current relay with a winding 18 and contacts 19, 20 and a maximum current relay with a winding and contact 22, a time relay with a winding 23 and contact 24 are introduced into the device for controlling an asynchronous electric motor. The time relay with winding 23 and contact 24 also enters the device. engine 1 built-in brake with windings 11, 12. When the engine 1 is turned on, the specified brake is first applied, after actuation, the command to turn on the engine 1 is given, which prevents the brake from coming out and the engine overheating. 1. If the brake is not triggered When a certain time has elapsed, the device for protecting the engine from overheating is switched off. 2 Il. S (Lu you ate 4 cl

Description

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The invention relates to electrical engineering and can be used in electric drives of balancing machines with an electromechanical brake.

The purpose of the invention is to trace the functional reliability of the device.

Figure 1 shows the control circuit for the contacts of the relays in Figure 2 is the electric drive circuit.

The device for controlling the induction motor 1 contains a magnetic starter with a winding 2, three power contacts 3, with a closing 4 and two opening 5 and 6 block contacts, a brake contactor with a winding 7 and three closing contacts 8-10, two half windings 11 and 12 of the electromechanical brakes with two built-in diodes 13 and 14, ballast resistor 15, Start buttons 16 and Stop 1 One terminals of two power contacts 3 of a magnetic starter are designed to connect two terminals of the stator winding of an induction motor, and O ther three power terminals 3 contacts the magnetic actuator - for connecting phase conductors pitakschey network. One pin of the ballast resistor 15 is connected via the Stop button to one pin of the Start button 16 and the first closing contact 8 of the brake contactor and to the first bus of the power source. Another output of the Start button 16 through the coil 7 of the brake contactor is connected to one output of the winding 2 of the magnetic starter, one output of the second closing contact 9 of the brake contactor, to the second power supply bus and to the cathode of the first built-in diode 13, the anode of which is connected to the end of the first half winding 11 electromechanical brakes, the beginning of which is connected to the end of the second half winding 12 and to one terminal of the third closing contact 10 of the brake contactor. The beginning of the second semi-winding 12 of the electromechanical brake is connected to the cathode of the second built-in diode 14, the anode of which is connected to another terminal of the second closing contact 9 of the brake contactor.

The device also contains a current relay with a winding 18, a closing 19 and

5 0 5 0 5 Q 5 Q

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20 contacts, maximum current relay with winding 21 and closure contact 22, time relay with winding 23 and disconnect contact 24. One terminal of winding 21 of the maximum current relay is connected to one terminal of the third power contact 3 of the magnetic starter, the other the output of which is provided with a terminal for connecting the third output of the stator winding of the asynchronous motor 1. One output of the winding 18 of the current relay is connected to one output of the ballast resistor 15, and the other output is connected to the other output of the third closing contact 10 brake contactor. The ballast resistor 15 is shunted by the first tripping block contact 5 of the magnetic starter. Another conclusion of the first closing contact 8 brake. the contactor through a disconnecting contact 24 of the time relay and a closing block contact 4 of the magnetic starter connected in series to another terminal of the winding 2 of the latter, as well as to one terminal of the closing contacts 19 and 22, respectively, of the current relay and maximum current relay, the other terminals of which are connected respectively to another the output of the Start button 16 and one winding terminal 23 of the time relay. Another pin of the Start button 16 is connected to the connection point of the disconnecting contact 24 of the time relay and the closing block contact 4 of the magnetic starter. The specified output of the winding 23 of the time relay is connected through a second disconnecting block contact 6 of the magnetic starter and the disconnecting contact 20 of the current relay is connected to another output of the first circuit as the brake cone terminal 8. of the tactor, another winding of the time relay 23 is connected to the second power supply bus.

The device works as follows.

By pressing the Start button 16, the coil 7 of the brake contactor is energized, which, with its closure contacts 9 and 10, provides a forced mode for activating the brake, connecting to the power supply of the half winding 11 and 12 brakes with built-in diodes 13 and 14. Braking coil 7 of the braking contact

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the contactor locks itself. The pads of the rmose are uncoupled and when the current in the semi-windings 11 and 12 of the brake increases to a value equal to the current relay setpoint current (the setpoint current is equal to the total current of the formed mode in both the semi-windings 11 and 12 of the brake electromagnet), the latter is activated and by its closing contact 19 turns on the winding 7 of the magnetic starter, which is self-blocked by the closing block-contact. At the same time, the blocking contact 5 of the magnetic starter is opened, which

turns off the forced power t5 body mode, they are used to connect either the half-wake 11 and 12 brakes, and the short-circuit power contacts 3 of the magnetic starter start the electric motor 1. To disconnect the electric motor 1, press the Stop button 17.20 of connecting the phase conductors of the power supply network, one ballast terminal

When the supply circuit of one of the semi-windings 11 and 12 of the current relay brake is broken, the winding 2 of the magnetic leads of the stator asynum xpoiiHoro electric motor, the other leads of the three power contacts of the magnetic actuator are designed to

the resistor through the Stop button is connected to one pins of the Start button of the first closing contact brake

the main starter remains de-energized, the 25th contactor and to the first bus is30

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and through disconnection, contact 20 of the current relay and disconnecting block contact 6 of the magnetic starter connect winding 23 of the time relay. Last with a given shutter speed disables the winding 7 of the brake contactor, it protects it from overheating. In the presence of a mechanical fault, when the brake pads do not open at start or spontaneously clamp when the electric motor 1 is running, the overcurrent relay operates, which, by its closing contact 22, activates the winding 23 of the time relay. Last with a given shutter speed turns off the winding 2 of the magnetic starter, thus preventing the motor 1 from overheating.

The time delay of the relay is adjusted in such a way that it slightly exceeds in {) the normal start-up of the elec- tron. motor 1.

Thus, due to the introduction of the asyn-.50 chronic motor of the current relay, the maximum current relay and the time relay into the device for controlling, and their corresponding activation, the electric motor is prevented from a failure of the electromechanical brake, which increases the functional reliability of the device.

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power point, another output of the Start button through the coil of the brake contactor is connected to one output of the magnetic starter winding, one output of the second contact of the contact of the brake contactor, to the second power supply bus and to the cathode of the first built-in diode, the anode of which is connected to the end of the first half winding of the electromechanical brake, the beginning of which is connected with the end of the second semi-winding of the electromechanical brake and with one output of the third closing contact of the brake contactor, the beginning of the second semi-winding The electromechanical brake is connected to the cathode of the second built-in diode, the anode of which is connected to another output of the second contact contact of the brake TaiKTOpa, which, in order to increase its functional reliability, a current relay with winding closing and opening contacts is inserted in it, as much as possible a relay with a winding and a closing contact, a time relay with a winding and an opening contact, one output winding of the maximum current relay is connected to one output one third of its power contact of the magnetic starter l, the other output of which is provided with a clip for connecting the third formula of the invention

Device for controlling an asynchronous electric motor, containing a magnetic starter with a winding, three power contacts, with closing and two opening contacts, a brake contactor with a winding and three closing contacts

mi, two electromechanical brake half windings with two built-in diodes, a ballast resistor, Start and Stop buttons, one terminals of two power contacts of a magnetic starter are used to connect the phase wires connection to two terminals of the stator winding of an asin-xpoiiHoro electric motor, the other leads of three power contacts of the magnetic starter are

the resistor through the Stop button is connected to the same terminals of the Start button of the first closing contact

five

0

0 5

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power point, another output of the Start button through the coil of the brake contactor is connected to one output of the magnetic starter winding, one output of the second contact of the contact of the brake contactor, to the second power supply bus and to the cathode of the first built-in diode, the anode of which is connected to the end of the first half winding of the electromechanical brake, the beginning of which is connected with the end of the second semi-winding of the electromechanical brake and with one output of the third closing contact of the brake contactor, the beginning of the second semi-winding The electromechanical brake is connected to the cathode of the second built-in diode, the anode of which is connected to another output of the second contact contact of the brake TaiKTOpa, which, in order to increase its functional reliability, a current relay with winding closing and opening contacts is inserted in it, as much as possible relay with winding and closing contact, time relay with winding and disconnecting contact, one terminal of the winding of the maximum current relay connected to one terminal of the third power contact of the magnetic starter l, the other output of which is provided with a clip for connecting the third output of the stator winding of the induction motor, one in (the water coil of the current relay is connected to another output of the ballast resistor; the other output of which is connected to the other output of the third braking contact of the brake contactor, the ballast resistor is shunted by the first disconnecting block the contact of the magnetic starter, another output of the first closing contact of the brake contactor through the disconnecting contacts of the time relay and circuit connected in series the tactile auxiliary contact of the magnetic starter is connected to the other end of the winding of the latter, as well as to one end of the

current relay contacts and max

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current relay, - other outputs of which are connected respectively to another output of the Start button and to one time relay winding terminal, 5 another output of the Start button is connected to the junction of the disconnecting contact of the time relay and the closing contact of the magnetic starter, another output of the time relay winding) 0 through the second disconnecting blocking contact of the magnetic starter and the disconnecting contact of the current relay connected in series to another output of the first closing contact 15 of the brake contactor, another output of the relay coil time connected to another power supply bus.

Editor A. Shishkin

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Compiled by V. Aleshechkin

Tehred L.Syordyukova Proofreader M, Maksimishinets

Order 5136/56 Circulation 631 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

Claim A device for controlling an asynchronous electric motor, comprising a magnetic starter with a winding, three power contacts, with make and two disconnect block contacts, a brake contactor with a winding and three make contacts, two half-windings of an electromechanical brake with two built-in diodes, a ballast resistor, Start and Stop buttons, one the terminals of the two power contacts of the magnetic starter are designed to connect the two terminals of the stator winding of the induction motor, the other terminals of the three power circuits The magnetic starter terminals are designed to connect the phase wires of the power supply network, one terminal of the ballast resistor through the Stop button is connected to one terminal of the Start button. · The first make contact of the brake contactor and to the first bus of the power source, the other terminal of the Start button through the winding of the brake contactor is connected to one terminal windings of the magnetic starter, one terminal of the second make contact of the brake contactor, to the second bus of the power source and to the cathode of the first built-in diode, the anode of which is connected Open to the end of the first half-winding of the electromechanical brake, the beginning of which is connected to the end of the second half-winding of the electromechanical brake and to one terminal of the third closing contact of the brake contactor, the beginning of the second half-winding of the electromechanical brake is connected to the cathode of the second built-in diode, the anode of which is connected to the other terminal of the second closing contact of the brake contactor characterized in that, in order to increase functional reliability, a current relay with a winding closing and opening is introduced into it contacts, the maximum current relay with a winding and a make contact, the time relay with a winding and a make contact, one terminal of the maximum current relay winding is connected to one terminal of the third power contact of the magnetic starter, the other terminal of which is equipped with a clip for connecting the third 1259457 '6th output of the stator winding asynchronous electric motor, one terminal of the current relay winding is connected to another terminal of the ballast resistor, the other terminal of which is connected to another terminal of the third closing contact of the brake ontactor, ballast resistor is shunted by the first NC contact block of the magnetic starter, the other terminal of the first NC contact of the brake contactor is connected through the decoupling contact of the time relay and the NC terminal of the magnetic starter connected to the other terminal of the winding of the latter, as well as to one terminal of the current relay contact contacts and overcurrent relays, other conclusions which are connected to the other terminal of the Start button, and the same conclusion time of the relay coil, the other in the ₅ The Start button is connected to the connection point of the NC contact of the time relay and the NC block contact of the magnetic starter, the other terminal of the winding of the time relay 10 is connected through a series of the second NC block contact of the magnetic starter and the NC terminal of the current relay to the other terminal of the first NC contact 15 of the brake contactor , the other terminal of the time relay coil is connected to another bus of the power source. \ \ 1 R / FIG. 2