SU1422346A1 - Device for dynamic braking of three-phase induction motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used in an automated AC electric drive. The purpose of the invention is to increase the reliability and expansion of the field of application by providing the possibility of using asynchronous electric motors with various connection circuits of the stator winding. The device for dynamic braking of a three-phase asynchronous electric motor contains a line contactor 2 with three closing contacts 3 - 5 and with two normally closed contacts 12, 13 and two diodes 6, 7, two capacitors 8, 9, two resistors 10, 11. Two chains formed by connected a capacitor, a diode and a resistor are connected in series to the two phases of the motor winding 1. The diode and the resistor are shunted by the corresponding contact 12, 13. In the proposed device, the engine is braked electronically without additional with switching devices for any circuit of the stator winding of the compound of the engine 1. 1-yl. with S (G. with

Description

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The invention relates to electrical engineering and can be used in an automated electric drive of alternating current.

I The purpose of the invention is to increase the water supply and the expansion of the area of application by providing the possibility of AND using asynchronous electric motors with various stator winding connection diagrams.

The drawing shows the principle of the electrical circuit of the device

 The device for dynamic deceleration of a three-phase asynchronous motor 1 contains a linear contactor 2 with three closing contacts 3 - 5 and two diodes 6 and 7, two capacitors 8 and 9, two resistors 10 and 11, the linear contactor 2 is complemented by two break contacts 1.2 and 13 one terminals of capacitors 8 and 9 are combined and are intended for connection to the first phase of an asynchronous motor 1, another output of each capacitor 8 and 9 through connected in series, the corresponding diode 6 and 7 and resistor 10 and 11 are connected To: one terminal with corresponding disconnecting contact 12 and 13 of linear contactor 2, one output of each disconnecting contact 12 and 13 of linear contactor 2 is designed to connect the second and third phases of the winding of the induction motor 1, another output of each disconnecting contact 12 and 13 of the linear contactor 2 connected to the junction of the anode of the corresponding diode 6 and 7 and the other output of the corresponding capacitor 8. and 9.

The device works as follows.

The stator winding of the electric motor 1 is connected to the mains via {3 closing contacts 3 - 5 of the contactor 2. At the same time, its contacts 12 and 13 are opened and through the current limiting resistors 10 and 11 and diodes 6 and 7 the capacitors 8 and 9 are charged. a sudden (emergency) disconnection of the circuit from the network, the closing contacts 3-5 open

VNIIPN - Order 4438/54

Manu-ioligr. pr-tie, Uzhgorod, st. Project, 4

c, and the opening contacts 12 and 13 close and shunt the diodes 6 and 7 and the current-limiting resistors 10 and 11. The discharge of the capacitors 8 and 9 to the stator windings of the electric motor 1 begins, as a result of which dynamic braking occurs. The process of dynamic braking lasts until the full discharge of capacitors 8 and 9.

Thus, due to the introduction of the opening contacts of the linear contactor and the proposed circuit for switching on the device element 1t, emergency braking of the electric motor is provided without additional commutation apparatus with any connection circuit of the stator winding.

Claims (1)

Invention Formula Device for dynamic braking of a three-phase asynchronous electric motor, containing a linear contactor with three locking co-factors and two diodes, characterized in that, in order to increase reliability and expand the field of application by allowing the use of asynchronous electric motors with different connection circuits of the stator winding Two capacitors and two resistors are introduced, and the line contactor is equipped with two break contacts, one capacitor terminals are combined and designed for connecting to the first phase of an asynchronous motor, another output of each capacitor through a diode connected in series and a resistor connected to one output of the corresponding disconnecting contact of a linear contactor to connect one of the two remaining phases of the stator winding of the asynchronous motor, another output of each disconnecting contact of a linear contactor connected to the junction point of the anode of the corresponding diode and the other pin of the corresponding capacitor. Circulation 583 Subscription