The Hybrid Motor Prototype: Design Details and Demonstration Results

A novel hybrid rotary motor incorporating piezoelectric and magnetostrictive actuators has been designed and demonstrated. The novelty of this motor was the creation of an electrical resonant circuit, whereby reactive power requirement on the power source is reduced. It was envisioned that the motor would be suitable for low output speed, high torque applications because of its design. This report presents the constructional details of this motor and the results of the demonstration

Qualitative Analysis of a Bulk Ferromagnetic Hysteresis Model

In this paper, we present a set of equations for a bulk ferromagnetic hysteresis model. We establish the connection between this set of equations and classical energy loss expressions for ferromagnetic hysteresis. We show analytically that for periodic inputs the system of equations has a limit set that is a periodic orbit in the H \Gamma M plane, under certain constraints on the parameters. The results on the\Omega limit set proved in this paper is used in extensions of our work to a bulk magnetostriction model in [1]. 1 Introduction In 1983, D.C. Jiles and D.L. Atherton [2, 3] proposed a model for ferromagnetic hysteresis from phenomenological and thermodynamic considerations. This model is very appealing from the control point of view as it describes hysteresis as the solution of four differential equations. The verification of the periodic nature of the hysteresis curves with sinusoidal inputs, has been achieved by computer simulation[2, 3]. V. Rizzoli et al.[4] use the harmonic ..

Smart Motor Concept Based on Piezoelectric-Magnetostrictive Resonance

In this paper, we discuss a smart motor concept, in which piezoelectric and magnetostrictive actuators forming a resonance electric circuit function together to produce bidirectional motion of a steel drum. Resonance frequency is set at 4KHz, thereby enabling operation of the motor at reasonably high frequencies. Keywords: smart structures, smart motors, control systems 1 INTRODUCTION Smart actuator based motor concepts pose a challenging problem due to their high reactive power requirements at high frequencies. Magnetostrictive actuators behave as inductors and piezoelectric and electrostrictive actuators behave as capacitors. If only one type of actuators were to be used, the reactive power requirements limit the supply frequency to the motor, and therefore, the speed of operation. In this paper we propose a way of solving this problem by using magnetrostrictive and piezoelectric actuators simultaneously in a resonant circuit configuration, thereby letting the two types of actuator..