Bias Magnetic Field of Stack Giant Magnetostrictive Actuator: Design, Analysis, and Optimization

Abstract

Many novel applications using giant magnetostrictive actuators (GMA) require their actuators output bidirectional strokes to be large enough to drive the load. In these cases, the sophisticated method to form such a sufficient bias field with minimum power and bulk consumption should be considered in the principal stage of GMA design. This paper concerns the methodology of bias field design for a specific GMA with stack PMs and GMMs (SGMA): both loop and field models for its bias field are established; the optimization method for given SGMA structure is outlined; a prototype is fabricated to verify the theory. Simulation and test results indicate that the bias field could be exerted more easily using SGMA structure; the modeling and optimization methodology for SGMA is valid in practical design.

Design and analysis of magnetostrictive two-dimensional kinetic energy harvester

“…The first method makes it easier to obtain a magnetic field with adjustable size but suffers from the effect of mutual inductance between the bias and pick-up coils, leading to more significant power consumption, lower efficiency, and larger radial dimensions. The permanent magnet approach, which not only simplifies the structure and eliminates the need for an external power supply, has been widely used in recent research but has the disadvantage that the magnetic field strength provided by the permanent magnet cannot be adjusted, and there is magnetic leakage [44]. Therefore, it is necessary to reasonably design the arrangement and magnetic circuit of the permanent magnet so that the Terfenol-D can work in the linear interval with high electromechanical coupling coefficient so that the harvester can obtain better power output characteristics.…”

Electrodeposited Fe–Ga Alloy Films for Directly Coupled Noncontact Torque Sensing

“…A common design criterion in magnetic-based sensors is the need to align the primary magnetic axis of the sensor to take full advantage of the stimulus and sensing mechanisms. To do this, permanent magnets and/or electromagnets are often used, which add complexity, cost, and/or power losses [16]- [18]. Alternatively, magnetic bias can be induced by shape, coupling layers, and texture [4], [19], [20].…”

Force and deformation transmission characteristics of a compliant tendon–sheath actuation system based on Hill-type muscle model

“…Magnetostrictive materials are also used in some artificial muscles; Zhang built a bidirectional micro-swimming robot using two optimized magnetostrictive artificial muscles as fins. 14,15 However, the inherent hysteresis and high stiffness also restrict the usage of this kind of material.…”