A prototype mechanism for three-dimensional levitated movement of a small magnet

This paper deals with basic technologies for noncontact manipulation of small objects using magnets in micromachine applications. A small permanent magnet is manipulated by controlling the magnetic field applied to it. We propose a prototype mechanism to control the magnetic field for 3D levitated movement of an object. The prototype consists of eight electromagnets, pole-pieces to connect the magnetic poles, a soft iron yoke, and permanent magnets embedded in the yoke to compensate for the gravitational force of an object (a small permanent magnet). Regulation of a magnetic field and, as a result, motion of the object are strongly related to the geometric design of the pole-piece. A strategy for the pole-piece design is proposed and tested experimentally. Motion of the object in the vertical direction is realized by controlling the sum of the electromagnet currents for regulation of magnetic field gradient. Motion in the horizontal plane is realized by controlling the ratio of each electromagnet current for regulating the location of the maximum magnetic field. Results of several experiments show that the proposed prototype is effective.

[1]  R. Gerber,et al.  Sensors for magnetic bearings , 1993 .

[2]  H. Hedia,et al.  Corner Modelling for BEM in Magnetostatic , 1991 .

[3]  R. E. Pelrine.  Maglev microrobotics: an approach toward highly integrated small-scale manufacturing systems , 1989, Proceedings. Seventh IEEE/CHMT International Electronic Manufacturing Technology Symposium,.

[4]  Tatsuya Nakamura.  Mechanism for 2-D Magnetically Levitated Movement of a Micro Magnet. , 1995 .

[5]  M A Howard,et al.  Nonlinear magnetic stereotaxis: three-dimensional, in vivo remote magnetic manipulation of a small object in canine brain. , 1990, Medical physics.

[6]  E.E. Covert.  Magnetic suspension and balance systems , 1988, IEEE Aerospace and Electronic Systems Magazine.

[7]  Ralph L. Hollis,et al.  A six-degree-of-freedom magnetically levitated variable compliance fine-motion wrist: design, modeling, and control , 1991, IEEE Trans. Robotics Autom..

[8]  J. D. Robichaux,et al.  Model based maglev microrobotic motion control , 1991, Proceedings. 1991 IEEE International Conference on Robotics and Automation.

[9]  I. Busch-Vishniac,et al.  Magnetic levitation-based micro-automation of mechanical processes in semiconductor fabrication , 1990, IEEE Proceedings on Micro Electro Mechanical Systems, An Investigation of Micro Structures, Sensors, Actuators, Machines and Robots..