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Sensors 2016, 16(3), 407; doi:10.3390/s16030407

Theoretical and Experimental Analysis of an Induction Planar Actuator with Different Secondaries—A Planar Driver Application for Metallic Surface Inspection

1
Post-Graduate Programme in Electrical Engineering, Federal University of Rio Grande do Sul, Porto Alegre, RS 90035-190, Brazil
2
Electrical Engineering, Lutheran University of Brazil, Canoas, RS 92425-900, Brazil
3
School of Engineering, College of Agriculture, Engineering and Science, University of KwaZulu-Natal, Howard College Campus, Durban 4041, South Africa
*
Author to whom correspondence should be addressed.
Academic Editors: Slawomir Wiak and Manuel Pineda Sanchez
Received: 30 December 2015 / Revised: 4 March 2016 / Accepted: 16 March 2016 / Published: 19 March 2016
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Abstract

This paper presents a study on an induction planar actuator concept. The device uses the same principles as a linear induction motor in which the interaction between a travelling magnetic field and a conducting surface produces eddy currents that leads to the generation of a thrust force and can result in movement over a metallic surface. This can benefit the inspection of metallic surfaces based on the driving platform provided by the induction planar actuator. Equations of the magnetic and electric fields are presented and, by means of these equations, the forces involved were calculated. The behaviour of thrust and normal forces was analysed through the equations and by numerical models, and compared with the results obtained by measurements on a device prototype built in the laboratory as part of the study. With relation to the surface under inspection that forms the secondary, three cases were analysed: (1) a double-layered secondary formed by aluminium and ferromagnetic slabs; (2) a single aluminium layer and (3) a single ferromagnetic layer. Theoretical and measured values of thrust and normal forces showed good correlation. View Full-Text
Keywords: induction planar actuator; surface inspection; thrust force; normal force; analytical model; numerical model; measurement of force; linear induction motor induction planar actuator; surface inspection; thrust force; normal force; analytical model; numerical model; measurement of force; linear induction motor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Treviso, F.; Silveira, M.A.; Flores Filho, A.F.; Dorrell, D.G. Theoretical and Experimental Analysis of an Induction Planar Actuator with Different Secondaries—A Planar Driver Application for Metallic Surface Inspection. Sensors 2016, 16, 407.

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