RU2396693C1 - Self-contained electric control device - Google Patents

Abstract

FIELD: electricity. ^ SUBSTANCE: device consists of power sources, rheostat, dc electric motor, synchronous generator with exciter, three-phase rectifier with smoothing filter and salve unit. To the device there introduced is commutator of power source, unit of automatic power controls and unit of automatic tripping devices; at that, output of rheostat is connected to the first input of power source commutator, which has output and the second input, which are connected to input of electric motor and to output of automatic power controls unit respectively, the group of inputs of which is connected to group of outputs of automatic tripping devices unit having the input connected to output of three-phase rectifier with smoothing filter. ^ EFFECT: providing enhanced rotation time of shaft at various frequencies at switched off power source. ^ 1 dwg

Description

The invention relates to the field of electrical engineering and can be used in electrical control systems from a rotating shaft.

A device for autonomous electrical control is described in the book by V.E. Kabaev "Electrical Engineering with the Basics of Industrial Electronics" M .: Higher School, 1985, pp. 138-140. It uses a power source to rotate the shaft of the DC motor, the current value can be adjusted using a rheostat. The motor shaft is rigidly connected to the shaft of the synchronous generator. The latter can also be rigidly connected to the actuating unit, which is, for example, a propeller shaft, a drive, a propeller, a pair of wheels, a gearbox, etc. However, the device requires a constant power supply.

A device for autonomous electrical control, which is part of an autonomous power supply system, is set forth in patent No. 2284644, published September 27, 2006 in bull. No. 27, author of A. Chasovskaya The same nodes may be used in it as in the aforementioned first analogue. In this case, the actuator assembly can also be rigidly connected to the generator shaft. The shaft speed is regulated by a rheostat. The device can work for some time without a direct current source by maintaining a constant voltage supplied to the electric motor by automatically adjusting it. In this case, the voltage is preliminarily converted from a three-phase output by a synchronous generator to a constant voltage in a three-phase rectifier with a smoothing filter. However, the device cannot increase the time of rotation of the shaft at different speeds when turning off the power source.

In the proposed device, when the power source is turned off, an increase in the shaft rotation time at different frequencies is provided. This is achieved by introducing a power supply switch, a block of automatic power regulators and a block of automatic releases, while the output of the rheostat is connected to the first input of the switch of a power source having an output and a second input respectively connected to the input of the electric motor and to the output of the block of automatic power regulators, the input group of which is connected with the group of outputs of the block of automatic releases, having an input connected to the output of a three-phase rectifier with a smoothing filter. In the drawing and in the text, the following notation:

1 - power source;

2 - rheostat;

3 - power supply switch;

4 - a direct current electric motor;

5 - synchronous generator with a pathogen;

6 - executive unit;

7 - block automatic power regulators;

8 - block automatic releases;

9 - three-phase rectifier with a smoothing filter,

wherein the output of the power source 1 through the rheostat 2 is connected to the first input of the switch of the power source 3 having an output and a second input respectively connected to the input of the DC motor and the output of the block of automatic power controllers 7, the group of inputs of which is connected to the group of outputs of the block of automatic releases 8 having an input connected to the output of a three-phase rectifier with a smoothing filter 9, having first, second and third inputs connected respectively to the first, second and third outputs Synchro generator exciter 5 is rigidly associated with the actuator assembly 6 and the DC motor 4.

The operation of the device is as follows.

Using a power source 1, which can be a rechargeable battery or a rectifier that converts alternating voltage to direct voltage, a direct current is supplied through a rheostat 2, through a switch of a power source 3 to a DC motor 4, the shaft of which is rigidly connected to the shaft of the synchronous generator with the exciter 5 where, using a DC generator, the field windings are excited. The generator shaft is also rigidly connected to the actuating unit 6, for which, for example, a propeller shaft, a wheelset, a propeller, electromotive systems can be used. In addition, the generator provides a three-phase alternating voltage to a three-phase rectifier with a smoothing filter 9. Using rheostat 2, the rotational speed of the motor shaft 4 is changed. The voltage at the three-phase output of the generator 5 and the output of the rectifier 9 is also changed. In this regard, the shaft can rotate with different frequencies. An example of a synchronous generator with an exciter 5 is presented in the aforementioned first analogue on p. 139, Fig. 94, and an example of a three-phase rectifier with a smoothing filter 9 that converts AC to DC is presented in the book by E.S. Traube, V.M. Mirgorodsky "Electrical Engineering and Fundamentals of Electronics" 1985, p. 107. From the output of a three-phase rectifier with a smoothing filter, a constant voltage is supplied to the block of automatic releases 8. In this block, depending on the voltage value from the rectifier 9, a certain release is activated. Each release operates at a certain voltage interval and passes voltage from the rectifier 9 to the corresponding automatic power regulator of the automatic power control unit 7. The number of automatic power regulators in block 7 is equal to the number of automatic releases in block 8. When the voltage is in a certain voltage range at the input corresponding automatic voltage regulator, at the output of it there will be a rated voltage.

An example of a specific implementation of an automatic trip unit is presented in the aforementioned book by E.S. Traube, V.M. Mirgorodsky on pages 142-143, and an example of a specific implementation of an automatic voltage regulator as part of a block of such regulators that perform the functions of constant voltage stabilizers is presented in book M. BUT. Shustov "Power supplies and stabilizers." Book 2, 2007, Moscow: Dodeka XXI Altex Publishing House, p. 87. From the output of block 7, the voltage to the electric motor 4 is supplied through the switch of the power source 3 after switching and setting a certain frequency of rotation of the shaft of the generator 5 using rheostat 2.

The switch can also act as an automatic release, connecting a power source when the voltage drops below the permissible value. An example of a specific design of the switch is presented in the book of M. M. Katsman “Handbook of electric machines” M., 2005, p. 457, which can carry out switching and one input of the electric motor. Thus, a constant rotation of the shaft at different frequencies in the inertial mode is ensured in the absence of connecting the power source 1. At the same time, the rotation time of this shaft is increased, which provides an economic effect in electrical control systems where the mechanical connection of the shaft with the actuator is used.

Claims (1)

An autonomous electrical control device consisting of a power source, a rheostat, a direct current electric motor, a synchronous generator with an exciter, a three-phase rectifier with a smoothing filter and an actuating unit, where the output of the power source is connected through a rheostat to the input of a direct current motor rigidly connected to a synchronous generator with an exciter, having first, second and third outputs, respectively connected to the first, second and third inputs of a three-phase rectifier with a smoothing filter, and having a rigid connection with an actuating unit, characterized in that a power supply switch, a block of automatic power controllers and a block of automatic releases are introduced, while the output of the rheostat is connected to the first input of the switch of a power source having an output and a second input, respectively connected to the input of the electric motor and the output of the block of automatic power regulators, the group of inputs of which is connected to the group of outputs of the block of automatic releases, having an input connected to the output of a three-phase straightener with a smoothing filter.