A novel magnetostrictive torsional resonant transducer

Mohammad Reza Karafi, Yousef Hojjat*, Farrokh Sassani, Mojtaba Ghodsi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


In this paper, a novel actuator called Magnetostrictive Torsional Resonant Transducer (MTRT) is introduced. The transducer is composed of a magnetostrictive horn, a stainless steel backing and a housing. In this transducer a spiral magnetic field, made up of longitudinal and circumferential components, is applied to the magnetostrictive horn. As a result, the magnetostrictive horn oscillates torsionally based on the Wiedemann effect. The magnetostrictive horn is made up of "2V permendur", which has isotropic magnetic properties. The magnetomechanical differential equation of the MTRT is derived, and a transducer is designed for a resonant frequency of 12,075 Hz. Natural frequency and mode shape of the transducer are considered theoretically, numerically, and experimentally. The effects of axial and circumferential magnetic fields on torsional displacement of the MTRT are investigated experimentally. The experimental results show that this transducer resonates at the frequency of 12,325 Hz, while the maximum torsional displacement of the tip of the transducer is 1.2 mrad. These are promising features for industrial applications.

Original languageEnglish
Pages (from-to)71-78
Number of pages8
JournalSensors and Actuators, A: Physical
Publication statusPublished - 2013
Externally publishedYes


  • Magnetostrictive
  • Permendur
  • Torsional transducer
  • Wiedemann effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering


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