SU1676051A1 - Device for braking the induction motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used with frequent starts and stops of electric drives. The aim of the invention is to simplify. The drawing shows a diagram of a device for braking an asynchronous motor. When the engine 1 is disconnected from the network, the power contacts 2 and the closing contact 4 are opened, the closing contact 3 is closed, after which capacitor braking begins. The mechanical brake is still disengageable, since its coil 7 remains under voltage due to the closed contact 6 of the DC relay, the coil 5 of which receives power from

Description

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a charged capacitor 10. The turn-off time of the direct current relay is controlled by the resistor 11 or the capacitance of the capacitor 10, or both, simultaneously

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

The aim of the invention is to simplify.

The drawing shows a diagram of the device.

The device for braking the asynchronous motor 1 contains a magnetic starter with three power closing contacts 2 for connecting the phases of the stator winding to the phases of the power supply, with the closing and closing contacts 3 and 4, the DC relay with the coil 5 and the closing contact 6, mechanical brake with a coil 7, one output of which is intended to connect to the power supply zero, another output of the coil 7 is connected to one output of the closing contact 6 of the direct current relay, the other output of the contact 6 is designed to be connected to the phase of the power supply, the anode of the diode 8 is connected to one output of the first capacitor 9 and provided with a connection to connect the stator winding to the first phase, the other output of the first capacitor 9 is connected to one output of the opening contact 3 of the magnetic starter, the other output of which is intended to connected to the second phase of the stator winding, the cathode of the diode 8 is connected to one terminal of the second capacitor 10 and coil 5 of the dc relay, another terminal of the coil 5 is connected to one end of an adjustable resis ora 11, the other terminal of which is connected to the other terminal of the second capacitor 10 and to one terminal of resistor 12, the other terminal of the resistor 12 is connected to one terminal of the contact 4 and the other end connected to the other terminal of the contact 3.

The device works as follows.

In the initial operating position, contacts 2 and contact 4 of the magnetic starter are closed, and contact 3 is open, contact 6 of the DC relay and brake coil 7 are energized, and motor 1 is operating in motor mode.

After switching off the direct current relay, its contact 6 opens. The brake coil 7 is also de-energized and it brakes the engine 1 1 sludge.

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When the engine 1 is turned off from the network, the power contacts 2 and contact 4 are opened, contact 3 is closed, after which capacitor braking begins. The mechanical brake is still disengageable because its coil 7 remains under voltage due to the closed contact 6 of the DC relay, the coil 5 of which is powered by the previously charged capacitor 10. The switching time of the DC relay is controlled by the resistor 11 or the capacitor 10, or both at the same time. After switching off the direct current relay, its contact 6 opens. The brake coil 7 is also de-energized and it brakes the engine 1. The mechanical brake is most discharged when it is put into operation at the time the capacitor braking is stopped. The lower critical speed of capacitor braking is controlled by the capacitance of the capacitor 9.

In the proposed device, the high reliability of the entire braking mode is ensured due to the implementation of two-stage braking, at one of the stages of which condenser braking is used.

Claims (1)

Invention Formula Device for braking an asynchronous electric motor, containing a magnetic starter with three power make contacts, designed to connect the stator winding to a power source, with opening and closing contacts, two capacitors, a diode, an adjustable resistor, a mechanical brake with a coil, a direct current relay, one output the mechanical brake coil is designed to connect to a zero power source, the diode anode is connected to one output of the first capacitor and is equipped with a output to connect to phase of the stator winding, another lead of the first capacitor is connected to one lead of the magnetic magnet opener contact, the other lead of which is intended to be connected to the second phase of the stator winding, the cathode of the diode is connected to one lead of the second capacitor and DC coil coils, another DC coil lead is connected to one pin of an adjustable resistor, characterized in that, for the sake of simplicity, a resistor is inserted into it, and the DC buckle is equipped with a make contact, one pin of which is intended to be connected to the phase of the power source, another output of the closing contact of the constant relay 0 current is connected to another output of the mechanical brake coil, another output of the variable resistor is connected to another output of the second capacitor and the first output of the resistor, the second output of which is connected to one output of the closing contact of the magnetic actuator, the other output of which is connected to the other output of the magnetic contact of the magnetic contact.