Optical encoder feedback system for levitating rotor system
This paper describes the design and fabrication of feedback control system for a three phase motor with a
diamagnetically levitating rotor. The planar rotor described in this paper uses a triangular configuration of magnets that
rotates due to nine electric coils evenly spaced around the rotor. An optical mechanical feedback system controls the
frequency at which the rotor spins. The current input to the coil is controlled by a mechanical relay circuit which latches
based on a DC pulse signal generated by a PID control algorithm. The mechanical relay circuit allows current to flow to each coils (the actuators of this system), which then produces a magnetic field strong enough to spin the rotor.
This paper was published in SPIE Proceedings Vol. 7650
Health Monitoring of Structural and Biological Systems 2010, Tribikram Kundu, Editors, 76501Z