Analysis and initial synthesis of a novel linear01348758

Analysis and initial synthesis of a novel linear01348758 -...

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Analysis and initial synthesis of a novel linear actuator with active magnetic suspension Anton V. Lebedev, Elena A. Lomonova, Peter G. van Leuven, Joris Steinberg Electrical Engineering Department Eindhoven University of Technology Eindhoven, The Netherlands [email protected] Dick A.H. Laro Mechanical Engineering Department Delft University of Technology Delft, The Netherlands [email protected] Abstract —In this paper attention is given to the initial design and experimental verification of the novel IU-shaped electromechanical actuator as a part of six degrees of freedom (6- DoF) contactless sliding system. Such a synergetic system is reached by integration of electromagnetic and mechanical structures of magnetic bearing and linear electromechanical actuator. Initially the performance of the electromagnetic module is examined. An analytical investigation of decoupled forces, originated from permanent magnets and suspension coils as functions of rotor position and current values in the control coils, is performed. Numerical results (the FEM models - Maxwell 3D Ansoft Co.) are validated by static measurements. Initial geometry is modified to demonstrate the improvement of the actuator performance. Keywords–actuators, finite element methods; magnetic forces; magnetic levitation; magnetostatics; soft magnetic materials I. INTRODUCTION An IU-shaped electromechanical actuator is a part of a new linear slider system (Fig. 1) for six degrees of freedom (6 DoF) suspension and propulsion described in [1, 2]. This system is tailored for optical discs mastering applications and should provide the movement along one long stroke sliding direction while being stabilized in other directions. Figure 1. Six Degree-of-Freedom Electromagnetic Contactless Slide System. From electromechanical and control points of view such an apparatus (the system combines the linear actuator providing a bi-directional movement along x -axis and permanent magnet biased active magnetic bearings) belongs to the class of non- linear high-order dynamic systems of considerable complexity. It is amenable to a formal mathematical analysis. However, it is not a trivial matter to comprehend the principles of its operation, e.g. under static and transient conditions, in an imaginative way. The general view of the IU–actuator is shown in Fig. 2. A stator consists of two identical U-shaped iron parts spaced from each other and magnetically coupled by means of two permanent magnet bars (for the biasing purposes) with the same direction of magnetization (along the y –axis) in upper and lower branches. The magnets’ driven fluxes (Fig. 2) travel along the stator core legs (the upper and lower ones), cross the air gaps, both enter and pass through the rotor length, return across the two next air gaps and stator yokes to the magnets.
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This note was uploaded on 05/08/2011 for the course MECHANICAL 203 taught by Professor Krishna during the Spring '11 term at Akademia Ekonomiczna w Poznaniu.

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Analysis and initial synthesis of a novel linear01348758 -...

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