SU1354375A1 - Arrangement for braking induction motor - Google Patents

Abstract

The invention relates to electrocotexus. and can be used when frequent starts and stops of electric drives. The purpose of the invention is to increase the reliability of braking. The device for braking an induction motor contains a magnetic starter with contacts 2 to a block with contacts 3.14, a direct current relay with a winding 4 n contact 5, an intermediate relay with overlay 11 and contacts, 12, 13 ,, brake 10. When braking an electric motor, condenser braking is first carried out, and then mechanical, 1 sludge. ABOUT

Description

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11354375

The invention relates to electrical equipment and can be used and frequent starts and stops of electric drives.

The purpose of the invention is to increase the reliability of braking.

The drawing shows the electrical circuit diagram of the device.

A device for braking an asynron electric motor. 1 contains magnetic starter with three baking contacts 2 and disconnecting locking contact 3, a DC relay with a winding 4 and a disconnecting contact 5, two capacitors G and .7, a variable resistor 8s diode 9 mechanical brake 10 with a winding, stator windings of an asynchronous electric motor 1 are intended for connecting the mains through the power contacts 2 of the magnetic valve: one pin of the winding of the mechanical brake 10 is used to connect one inductor of the asynchronous motor 1 to the stator winding, another tap of the winding Mechanical Protection brake 10 is designed for connecting the neutral conductor supply setid one terminal of the first capacitor 6 is connected to the anode of the diode and is designed for connecting the output of another stator winding of the asynchronous motor zlektro-, the other terminal of the first capacitor is connected to one vshodu

opening contact 3 of the magnetic starter and through a variable resistor 8 to one terminals of the DC coil winding and the second capacitor 7j whose other terminals are connected and connected to the cathode of diode 5, the other output of the opening contact of the magnetic actuator is assigned to the third output of the stator winding of the asynchronous electric motor 1 ,, prome: kutochny relay with winding 11 and two short circuits 1 and 12 contacts and 13 h closing contact block 14 of the magnetic starter, one terminals of the closing contacts 12 and 13 ind diate relay and closing the auxiliary contact 14 and the combined magnetic actuator designed for connecting a mains phase conductor, the other terminal of the second switching contact 13 intermediate relay connected in series through normally closed relay contact 5

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direct current and intermediate relay coil 11 is connected to another winding end of mechanical brake 10, one output of which is connected to another output of the first closing contact of the intermediate relay, connected in series the second closing contact 13 of the intermediate relay and disconnecting contact 5 of the direct current relay are bridged by the closing unit pin 14 of the magnetic starter,

Compact capacitors are used as capacitor 6, electrolytic capacitor 7 is used.

The device works as follows.

In the initial operating position, contacts 2 and the auxiliary contact 14 of the magnetic actuator are closed, and the auxiliary contact 3 is open and the motor 1 is in motor mode, the winding of the mechanical brake 10 and the winding 11 of the intermediate relay are energized, the brake is disarmed, and contacts 12-14 are closed. .

When the engine 1 is turned on from the network, the power contacts 2 and 3 are opened, the block contact 14 and the block contact 3 is closed, after which the capacitor braking begins. The mechanical brake 10 is still disengageable, since the winding remains under voltage due to the closed contact 12 because the winding 11 of the intermediate relay continues to receive power through the contacts 13 and 5,

With the appearance of an alternating voltage on capacitor 6, capacitor 7 begins to charge. When the voltage on capacitor 7 reaches the operating voltage of the direct current relay, the latter opens its contact 5 and winding 11 between the exact relay de-energizes its contacts 12 and 13 the winding of the brake 10 is also de-energized and it brakes the motor 1. After the capacitors B and 7 are discharged to the voltage, the lower holding voltage of the winding 4 of the relay, the latter returns to its initial state and closes the contact 5j prepared: and the circuit for the next cycle of the operation.

The time of operation of the relay current is regulated by the resistor 8 or the capacitance of the capacitor: the switch 7, or one and the other at the same time. The greatest

the mechanical brake will be unloaded when it is put into operation at the time of the termination of capacitor braking. The lower critical speed of capacitor braking is controlled by the capacitance of the capacitor 6.

Thus, due to the implementation in the proposed device of two-stage braking, at one of the stages of which condenser braking is used, the reliability of the entire braking mode is increased.

Claims (1)

Invention Formula A device for braking an induction motor containing a magnetic starter with three power contacts and a blocking contact, a DC relay with a winding and a breaking contact, two capacitors, a variable resistor, a diode, a mechanical brake with a winding, and the stator windings of the asynchronous motor are used to connect the power supply the network through the power contacts of the magnetic starter, one output winding of the mechanical brake is designed to connect to one output winding of the asynh onnogo motor, the other terminal of the winding of the mechanical brake is used for connecting the neutral conductor mains, one terminal of the first capacitor is connected to the anode of the diode and designed to connect another I Compiled by V.Aleshechkin Editor L. Zaitseva Tehred I. Veres Corrector M. Maksimishinets Order 5711/53 Circulation 659 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 54375 the output of the stator winding of the asynchronous electric motor, the other lead of the first capacitor is connected to one lead of the opening contact of the magnetic starter and, via a variable resistor, to one lead of the DC relay and the second capacitor, the other leads are combined and connected to the cathode of the diode a block contact of the magnetic starter is designed to connect the third terminal of the stator winding of the induction motor, about 0 and h 0 five 0 five 0 So that, in order to increase the reliability of braking, an intermediate relay with a winding and two closing contacts is inserted into it, the magnetic starter is equipped with a closing block contact, one terminals of the closing contacts of the intermediate relay and a closing block contact of the magnetic starter combined and intended to connect the phase mains supply wire, another output of the second closing contact of the intermediate relay through a series-connected disconnecting contact of the dc relay and an intermediate winding a relay connected to the other terminal of the mechanical brake winding, one terminal of which is connected to the other terminal of the first switching contact auxiliary relay connected in series intermediate the second make contact and break contact of the relay switch DC terminal block shunted closing magnetic actuator.