SU1390761A1 - Two-phase asynchronous electric motor controller - Google Patents

Abstract

The invention relates to electrical engineering, and can be used in electric drives of conventional mechanisms. The purpose of the invention is to simplify the control device of a two-phase asynchronous electric motor. This goal is achieved by using as switching elements two transistors 7 and 8 of different conductivity, each of which is included in the diagonal of a two-phase rectifying bridge made on diodes 14, respectively. The use of transistors of different conductivities in the device allows control of two independent channels consisting of transistors 7 and 8, two-phase rectifying bridges and primary windings 5 and 6 of transformer 4 with the help of one output two-polar signal of control unit 9. In this case, the control signal is galvanically developed with the output. I il. with s w

Description

with so

but

1139

The invention relates to electrical engineering and can be used in electric drives of general industrial mechanisms.

The purpose of the invention is to simplify the control device of a two-phase asynchronous electric motor.

The drawing shows a diagram of the device.

 The device comprises a first voltage transformer 1 with one primary winding 2, the terminals of which are intended to be connected to a power source 3, a second voltage transformer 4 with two primary coils 5 and 6, two transistors 7 and 8 of different conductivity, transistor control unit 9, the first pin 10 of which is intended to be connected to the source of the controlled signal, its second pin P is for connection to the neutral wire, the third pin 12 is connected to the base terminals of the trans30

of the resistors 7 and 8, two two-phase out-polarity, the winding bridges made on diodes 13 and 14 open, the first voltage transformer 1 is made with two secondary windings 15 and 16, and the second transformer 4, the voltage from one i secondary winding 17, the conclusions of which are intended to be connected to the terminals of the control winding 18 by a two-phase asynchronous electric motor.

The beginning of the first secondary winding 15 of the first voltage transformer 1 is connected to the beginning of the first primary winding 5 of the second voltage transformer 4, the end of which is 35

the transistor 7 and the transistor 8 remain closed, the first primary winding 5 of the transformer 4 is connected to the first secondary winding 15 trans-. formator 1. A two-phase asynchronous electric motor (DAE) control winding 18 is energized. When the voltage at the output of the negative-polarity transistor control unit 9, the transistor 8 opens, and the transistor 7 remains closed, the second primary winding 6 of the transformer 4 is connected to the second secondary winding 16 of the Transformer 1, voltage is applied to the DAE control winding 18. wherein the voltage phase is inverted. If the output of the transistor control unit 9 is not voltage, then the transistors 7 and B are in the closed state and the voltage is not applied to the control winding 18, AEC.

It is connected with the first AC output of the first two-phase rectifying bridge, the cathode output of which is connected to the collector of the first transistor 7, the second AC connection of the first two-phase rectifying bridge to the end of the first winding 15 of the first voltage transformer 1, emitters of both transistors 7 and 8 are combined into a common point, connected to the anode view of the first two-phase rectifying bridge, to the cathode output of the second two-phase rectifying bridge, and to the third output of the transistor control unit 9 Ramie 7 and 8.

The anode output of a two-phase rectifying bridge is connected to the collector of the second transistor 8, started; the second winding 6 of the second voltage transformer 4 is connected to the end of the second secondary winding 16 of the first transformer, the beginning of which is connected to the first AC terminal of the second two-phase rectifying bridge, the second AC output of which is connected to the end of the second primary winding b of the second voltage transformer 4, the secondary winding of which is intended to be connected to the terminals of the control winding 18 vuhfaznym induction motor.

The device works as follows.

Depending on the type of static characteristic of the transistor control unit 9, as well as on the polarity of the control signal, its output can be positive or negative or zero voltage. When the voltage at the output of transistor control unit 9 is polo0

5 positive, then open

five

0

five

0

five

the transistor 7 and the transistor 8 remain closed, the first primary winding 5 of the transformer 4 is connected to the first secondary winding 15 trans-. formator 1. A two-phase asynchronous electric motor (DAE) control winding 18 is energized. When the voltage at the output of the negative-polarity transistor control unit 9, the transistor 8 opens, and the transistor 7 remains closed, the second primary winding 6 of the transformer 4 is connected to the second secondary winding 16 of the Transformer 1, voltage is applied to the DAE control winding 18. wherein the voltage phase is inverted. If the output of the transistor control unit 9 is not voltage, then the transistors 7 and B are in the closed state and the voltage is not applied to the control winding 18, AEC.

Claims (1)

Invention Formula A device for controlling a two-phase asynchronous electric motor, comprising a first voltage transformer with one primary winding, the terminals of which are intended to be connected to a power source, a second voltage transformer with two primary windings, two transistors of different conductivity, a transistor control unit, the first terminal of which is intended to be connected to the source of the controlled signal, its second output is intended to be connected to the neutral wire, the third output is connected to the base terminals t two two-phase rectifying bridges, characterized in that, for the sake of simplicity, the first voltage transformer is made with two secondary windings, and the second voltage transformer is made with one secondary winding, the terminals of which are intended to be connected to the winding terminals control of a two-phase asynchronous electric motor, the beginning of the first secondary winding of the first voltage transformer is connected to the beginning of the first primary winding of the second voltage transformer, the end of which is connected to the first the alternating current of the first two-phase alternator bridge, the cathode output of which is connected to the collector of the first trans- the second AC output of the first two-phase rectifying bridge is connected to the end of the first winding of the first voltage transformer; the emitters of both transistors are connected to a common point and connected to the anode terminal of the first two-phase rectifying bridge and to the cathode output of the second rectifying bridge and connected to the third output of the transistor control unit, the anode output of the second two-phase thermal bridge is connected to the collector of the second transistor, the beginning of the second primary winding of the second t the voltage transformer is connected to the end of the second secondary winding of the first transformer, the beginning of which is connected to the first terminal of. an alternating current of the second two-phase rectifying bridge, the second AC output of which is connected to the end of the second primary winding of the second voltage transformer.