Magnetoelectric laminate composite based tachometer for harsh environment applications

Abstract

This study reports the design, fabrication, and characterization of a tachometer utilizing magnetoelectric (ME) laminate composites with sandwich structure consisting of Pb(Zr,Ti)O3 (PZT) and Galfenol. High temperature characterization of Galfenol shows that it can sustain the magnetic property over 500°C. The Curie temperature of PZT compositions was in the range of 325–340°C. The magnitude of the ME coefficient was found to scale with the dimensionless ratio (d g/S), where d is the piezoelectric strain constant, g is the piezoelectric voltage constant, and S is the elastic compliance. The tachometer design is based on the principle that when ME composite is exposed to oscillating magnetic field, it generates voltage with the same frequency.

Polymer‐Based Magnetoelectric Materials

“…This new kind of ME magnetic sensors also have enormous potential as by‐products related to magnetic sensors: electric current sensors, speed sensors, angular sensors, electronic steering, throttle control, battery management, vehicle transmission, digital compasses, and GPS devices165 are just some examples and many of them are already being studied 170, 178, 179…”

Dependence of magnetic susceptibility on stress in textured polycrystalline Fe81.6Ga18.4 and Fe79.1Ga20.9 Galfenol alloys

“…1 Magnetostrictive iron-gallium alloys ͑Galfenol͒ are particularly promising as they exhibit high magnetostriction and steel-like mechanical properties, 2 enabling transducers for harsh environments. 3 The magnetostriction constants and other properties of Galfenol have been shown to depend heavily on Ga content. 4 It is therefore necessary to identify optimal ranges of Ga content for transducer applications.…”

Influence of bias electric field on magnetoelectric interactions in ferromagnetic-piezoelectric layered structures

“…The results are of interest for composite based magnetic field sensors. [13][14][15][16] The work at MIREA was supported by grants from the Ministry of High Education and Science of Russian Federation and the Russian Fund for Basic Research ͑Grant No. 5-02-19643͒.…”