Design Procedure for Optimum Efficacy of Magnetostrictive Material (Tb0.3Dy0.7Fe1.95) in Actuator Applications
Raghavendra Joshi1, Subba Rao M2, Ravikiran Kadoli3
1Raghavendra Joshi, Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore, India.
2Subba Rao M, Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore, India.
3Ravikiran Kadoli, Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore, India.
Manuscript received on November 18, 2012. | Revised Manuscript received on December 13, 2012. | Manuscript published on December 30, 2012. | PP: 187-189 | Volume-2, Issue-2, December 2012. | Retrieval Number: B0857112212 /2012©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Magneto strictive materials are attracting increasing research attention due to inherent advantages such as outstanding magnetostriction, high energy density, high Curie temperature and quick response compared to PZT materials. Actuators using magneto strictive materials show great potential due to their high forces and short reaction times for applications on heavy and stiff structures such as in aeronautics, civil structures and machine tools. This paper discusses the layout and design of magneto strictive actuator to decide the suitable number of coil turns based on required magnetic field. In addition the systematic design procedure mainly focusing on electric, magnetic, thermal and mechanical aspects is being discussed. Analytical expressions such as equivalent magnetic circuit equation, flux, magnetic field intensity, shape factor of coils, peak to peak expression for magnetic field intensity and as well as for driving current, different losses in a actuator for the optimal usage of magneto strictive material in the applications of actuator are being outlined. Significance of leakage inductance of the actuator and choice of feeding amplifiers affecting actuator drive coils dimensioning are Illustrated.
Keywords: Magnetostriction, Curie Temperature, Magneto strictive Actuator, shape factor, leakage Inductance.