SU661499A1 - Matching device - Google Patents

Description

The invention relates to the field of automation. Namely, control systems for groups of electric drives for various purposes and can be used, for example, to control the speed of a group of rolling stands of a continuous rolling mill.

Known matching devices.

Of the known matching devices, the closest technical entity to the invention is a matching device containing a power transformer, the primary winding of which is connected to the power source, and the first, second and third terminals of the secondary windings are connected to the corresponding terminals of the potentiometers 2.

The disadvantage of such a device is low reliability due to temperature instability of the device, zero drift, tuning complexity, low control accuracy and non-linearity and limited control range.

i The aim of the invention is to increase the reliability of the device.

The goal is achieved by the introduction of isolation transformers into the proposed matching device,

The first terminals of the primary windings of which are connected respectively with the movable contacts of the potentiometers, the second terminals with the first terminal of the winding of the reference voltage of the power transformer, the second terminal of which is connected to the second terminal

the first potentiometer, and the second output of each subsequent potentiometer is connected to the moving contact of the previous potentiometer.

The drawing shows a schematic electrical diagram of a matching device.

It contains a power source 1, a power transformer 2, consisting of a primary winding 3, a winding of a reference voltage 4, and a secondary winding potentiometers separation transformers 7-73 consisting of primary 81-83 and secondary 9-9 windings.

The device works as follows.

The voltages of the windings 5-5 of the transformer 2 are folded by moving the sliders of potentiometers 6-6 oppositely or in accordance with the reference voltage of the winding 4 of the transformer 2. The resulting voltages are fed through the transformers 7-7 to the drive control circuits (not shown) of these channels and to the inputs of subsequent control channels. In this case, a proportional change in the speed of the electric drives of this and all subsequent control channels occurs, and the speeds of the drives of the previous control channels remain unchanged. The proposed device is reliable in operation and provides a wide range of control, high control accuracy, linearity of the control range, complete independence from the ambient temperature and instant readiness for operation. In addition, it does not need to be set up, is easy to use and has a much lower cost.

Claims (2)

Invention Formula A matching device containing a power transformer, the primary winding of which is connected to a power source, and the first, second and third leads of the secondary windings are connected to the corresponding leads of a potentiometer, characterized in that, in order to increase the reliability of the device, it contains separation transformers, the first leads of the primary windings which are connected respectively with the movable contacts of the potentiometers, and the second to the first terminals of the winding of the reference voltage of the power transformer, the second terminal of which is connected with the second output of the first potentiometer, and the second output of each subsequent potentiometer is connected to the movable contact of the previous potentiometer, iometer. Sources of information taken into account in the examination 1. USSR author's certificate No. 406188, mcl. G 05 D 13/00. 09/30/71. 2. USSR author's certificate number 397895, M. Kl. G 05 D 13/00, 30.09.71.