Electromagnetic Encoders Screen-Printed on Rubber Belts for Absolute Measurement of Position and Velocity

Sensors

Ferran Paredes¹  Ferran Martín¹  Cristian Herrojo¹  Ana Moya²  Claudia Delgado Simao²  Miguel Berenguel Alonso²  David Gonzalez³  Pep Bruguera³ 

[1] CIMITEC, Departament d’Enginyeria Electrònica, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain;Eurecat, Centre Tecnològic de Catalunya, Parc Científic i de la Innovació TecnoCampus, 08302 Mataró, Spain;Hohner Automation, P.I. Cal Batlle, 17400 Breda, Spain;

关键词: electromagnetic encoders;    screen-printing;    motion control;    microstrip technology;   

DOI  :  10.3390/s22052044

来源: DOAJ

【 摘 要 】

This paper presents, for the first time, an absolute linear electromagnetic encoder consisting of a rubber belt with two chains of screen-printed metallic inclusions (rectangular patches). The position, velocity, and direction of the belt (the moving part) is determined by detecting the inclusions when they cross the stator (the static part). The stator is a microstrip line loaded with three complementary split ring resonators (CSRRs), resonant elements exhibiting a resonance frequency perturbed by the presence of inclusions on top of them (contactless). The line is fed by three harmonic signals tuned to the resonance frequencies of the CSRRs. Such signals are generated by a voltage-controlled oscillator (VCO) managed by a microcontroller. The sensed data are retrieved from the pulses contained in the envelope functions of the respective amplitude modulated (AM) signals (caused by the belt motion) generated at the output port of the line. One of the signals provides the absolute belt position, determined by one of the chains, the encoded one. The information relative to the velocity and motion direction is contained in the other AM signals generated by the motion of the other chain, periodic, and thereby, uncoded. The spatial resolution of the system, a figure of merit, is 4 mm. Special emphasis is devoted to the printing process of the belt inclusions.

【 授权许可】

Unknown