SU1236592A1 - A.c.electric drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used in drive mechanisms. The purpose of the invention is to increase reliability. The device contains a three-phase asynchronous electric motor, a working switching device with a closing contact I, a starting switching device with a tapping contact 4, a working and starting phase-shifting elements (FE) 7, 8, phase windings 9, 10, II. Two additional make contacts 2, -3, and 5, 6 are introduced into the working and starting switching devices. As a result of the new connection of the working and starting switching devices, good starting motors are provided, and in the operating mode, a negative voltage is applied in the FE 7, 8 increases device reliability 1 il. (L with yu Se / 776 0

Description

The invention relates to electrical engineering and can be used in drive mechanisms for woodworking machines.

The purpose of the invention is to increase reliability.

The drawing shows an electrical circuit diagram of an electric drive.

The AC drive contains a three-phase asynchronous electric motor, a working switching device with three over 1. &Amp; tactile contacts 1-3, starting switching device with three closing contacts 4-6, working and starting phase-shifting- Etsie elements 7 and 8, one terminals of which are interconnected, the end of the first and the beginning of the second phase windings 9 and 10 of the asynchronous electric motor are interconnected , the beginning of the first phase winding 9 of the asynchronous electric motor is connected to the connection point of one of the working and starting phase-shifting elements 7 and 8, the other end of the working phase-shifting element 7 through the first closing contact 4 of the starting The switching device is connected to another output of the starting phase-shifting element 8, to the end of the third phase winding 11 of the induction motor and to one terminal of the first short circuit (its pin 1 of the working switching device, the other terminal of which is intended to connect the phase wire of the mains, the end of the third phase winding 11 of the asynchronous motor through the second closing contact 2 of the working switching device is connected to the end of the second phase winding 10 of the asynchronous motor, the start of the tr The phase winding circuit 1 1 last through the third closing contact 3 of the operating device yrch Jtiononoro of the device and the second closing contact 5 of the starting switching device are connected respectively to the beginning of the first phase winding 9 and to the end of the second phase winding 10 of the asynchronous electric motor, the first closing contact 1 of the working switching device is bridged by the third closing contact 6 of the starting switching device of the junction point of the end, the first phase winding 9 and the beginning of the second phase winding 10 of the asynchronous electrodes igate

L is equipped with a clamp for connecting the neutral wire to the supply network.

The device works as follows.

During start-up, the starting switching device is switched on and its contacts 4-6 are closed. As a result, the first phase winding 9 is connected to the mains through serially starting phase shifting. element, the first and third pins 4 and 6 of the starting switching device. Parallel to the phase-shifting element 8, the phase-shifting element 5 is switched on.

The second and third phase windings 10 and 11 of the engine are connected in series through the contact 5 of the starter and are also included in the single-phase

0 network. At the end of the engine acceleration. (controlled by time, speed, or other,) the starting switching device is turned off and the working switching device is turned on. Contact

5 and 4-6 are opened, and contacts 1-3 are closed. As a result, the phase windings 9-11 of the engine 1-3, contacts 2 and 3, are turned on in a triangle pattern. The working phase-shifting element 7 is connected via contact 2 in parallel with the second phase winding 10 of the motor. The latter switches to the operating mode.

Thus, due to the proposed connection of the starting and working switching devices, good starting motors are provided, and in the operating mode, an undervoltage is applied to the phase shifting elements, which increases the reliability of the device.

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ABOUT

 the invention

An AC electric drive containing a three-phase asynchronous electric motor, a working switching device with one closing contact, a starting switching device with one closing contact, a working and starting phase-shifting elements, one terminals of which are connected to each other, the end of the first and the beginning of the second phase windings of the asynchronous the electric motor is interconnected, the beginning of the first phase winding of the asynchronous electric motor is connected to the connection point of one of the

of the working and starting phase shifting elements, another output of the working phase shifting element through the first closing contact of the starting switching device is connected to another output of the starting phase shifting element, to the end of the third phase winding of the asynchronous electric motor and to one terminal of the first closing contact of the working switching device, the other the clamp of which is intended to connect the phase mains wire, which is characterized by the fact that, in order to increase reliability, the operating and start switching devices are supplemented with two closing contacts each, the end of the third phase winding of the induction motor through the second closing contact of the worker

the switching device is connected to the end of the second phase winding of the induction motor, the beginning of the third phase winding of the latter through the third closing contact of the working switching device and the second closing contact of the starting switching device are connected respectively to the beginning of the first phase winding and to the end of the second phase winding of the asynchronous electric motor, the first closing the contact of the working switching device is bridged by the third closing contact of the starting switching device, t ovary compound phase windings of the first end and the beginning of the second phase asynchronous motor winding is provided with a clamp for connecting the neutral conductor mains.

Claims (1)

Claim An AC drive containing a three-phase asynchronous electric motor, a working switching device with one closing contact, a starting switching device with one closing contact, a working and starting phase-shifting elements, one of the terminals of which are interconnected, the end of the first and the beginning of the second phase winding of the asynchronous the electric motors are interconnected, the beginning of the first phase winding of the asynchronous electric motor is connected to the connection point of one of the outputs of the working and starting phase shifting their elements, another terminal of the working phase-shifting element through the first closing contact of the starting switching device is connected to 5 other terminals of the starting phase-shifting element, to the end of the third phase winding of the asynchronous electric motor and to one terminal of the first closing contact of the working switching device, another terminal of which it is intended for connection of a phase wire of a power network, about t - characterized in that, in order to increase reliability, the working and 15 starting switching devices are supplemented with with each of the closing contacts, the end of the third phase winding of the induction motor through the second working contact 1236592 4 switching apparatus is connected to the end of the second phase winding of the induction motor, the beginning of the third phase winding of the latter through the third make contact of the working switching apparatus and the second 3 '. The make contact of the starting switching apparatus is connected respectively to the beginning of the first phase winding and to the end of the second phase winding of the asynchronous motor , the first make contact of the working switching device is shunted by the third make contact of the starting switching device, point connection end of the first phase winding and the start of the second phase winding induction motor is equipped with a clamp for connecting the neutral wire supply network 20.