Development of Magnetostrictive Resonant Torsional Vibrator

Abstract

In this paper, the design, construction, and operation of a magnetostrictive resonant torsional vibrator is described. To generate torsional vibration, two magnetostrictive patches are bonded on an aluminium horn. Two magnetic fields, longitudinal and circumferential, are applied into the patches. As a result, magnetostrictive patches vibrate torsionally based on the Wiedemann effect. The magnetostrictive patches are made up of "2V permendur" which has isotropic magnetic properties. The principle of the torsional vibrator is explained, and differential equations of torsional vibration of the horn are derived. A torsional horn is designed for resonant frequency of 8515 Hz. Experimental results show that the torsional angle of the tip of the horn is rad. This type of vibrator is exploited in applications which require torsional vibration such as miniature ultrasonic motors or ultrasonic assisted bone drilling system. In other words, the vibrator is being used as an actuator.

The influence of coil parameters and core lamination factor on the performance of an ultrasonic transducer with a tapered core

“…9 Synthetic giant magnetostrictive materials have a high piezomagnetic coefficient and hence are able to provide forces and displacements, which are good enough for many industrial applications. 10 Examples of these materials are ferromagnetic materials, 11 manganese-cobalt-silicon alloys (MnCoSi 1-x ) 12 ; ferrite-aluminum-bore alloy ([Fe 0.8 Al 0.2 ] 100-x B x ) with good machining and welding ability as well as low price 13 ; cobalt-ferrite alloy (Permendur) 14 ; cobalt-ferrite-vanadium alloy or permendur 2 V (Co 49 Fe 49 V 2 ) with isotropic magnetic properties as well as ease in the direction of magnetic fields 15 ; terbium-dysprosium-ferrite alloy or Terfenol-D (Tb 0.3 D 0.7 Fe 1.9 ) 16 with the greatest deformation due to application of magnetic field 17 ; ferrite-gallium alloy 18 or Galfenol (Fe 0.8 Ga 0.2 ) with machining ability and high tensile strength. 19 Magnetostriction is the result of several properties such as elasticity, strain, and magnetic phenomenon.…”

Investigation of Effective Parameters of Drop-on-Demand Droplet Generator

“…Piezoelectric buzzers can be implemented in DODs for a room temperature liquid (KuangChao Fan 2008). Using a piezoelectric vibrator (Sadeghian et al 2013;Mohammadzaheri et al 2017) or Magnetostrictive one (Ghodsi et al 2017;Karafi et al 2015;Ghodsi et al 2010;Ghodsi et al 2008), DOD can reach high frequency of vibration; on the other hand, the harsh environment (high temperature) can limit their use in DODs.…”