Expanding Functionality of “Angle-Parameter-Code” Measuring Transducers
Ekaterina V. Yurasova, A. S. Volosnikov · 2018
The paper deals with specific architecture features of the “angle-parameter-code” transducers. The traditional structure, which allows generating only the digital equivalent of a displacement from the output signals of a sin-cosine rotary transformer, is shown to be quite simple. The modern foreign resolver-to-digital converters (RDC)produce, in contrast to the single-channel ones, the digital equivalent of speed. This simplifies the electromechanical component of mechatronic systems by eliminating the tachometer connected with the operating mechanism and the actuating motor through a mechanical transmission or directly. In the latter case, the traditional use of the tachometer at low speeds presents the fundamental difficulties in obtaining the reliable information about the displacement speed. This limits the scope of the innovative gearless electric drive. The presented block diagrams of the measuring transducers owe their continuous improvement to numerous applications of resolvers. The years-long use of resolvers is due to their remarkable properties that are not surpassed by modern angle transducers based on other physical principles. Before the advent of digital systems, selsyns and resolvers were the most accurate and reliable analog primary transducers of angular position. The mechatronic systems based on such transducers meet the highest standards and able to operate successfully in a wide range of environmental influences: temperature, humidity, vibration and shock. In view of this, the attempts have been made in digital mechatronic systems to create the transducers with digital output, in which the basic primary transducer remained. The development of this direction proved to be extremely successful: foreign and domestic RDCs nowadays compete with digital code converters in resolution, accuracy and dynamic parameters. On the totality of required characteristics, no varieties of angle transducers can compete with them.