Magnetic Bearing Control System: Engineering Lab Experiment

MBC500 Magnetic Bearing Control Experiment

The MBC500 Magnetic Bearing Control Experiment is used by engineers at universities and institutions around the world for control education and research.The experiment consists of a rotor levitated by two magnetic bearings. The rotor is actively positioned in the radial directions at the shaft ends (4 degrees of freedom), passively centered in the axial direction, and freely rotates about its axis.

Feedback control, based on Hall Effect sensors, is required to levitate the rotor. This gives an unstable four input, four output system to be controlled. The experiment comes with four internal single-input, single-output controllers which will levitate the rotor. The controllers can be individually switched out, allowing the user to swap in a single controller on any loop (or loops), or swap in an MIMO controller for the full system. With all internal loops open, a sophisticated 4-by-4 external controller can be implemented. The control bandwidth is roughly 2 kHz, so external controllers can be either analog or DSP-based with sample rates of 20kHz or higher. Typical external controllers and data acquisition systems use products from dSpace, Mathworks, and National Instruments.

Three Models to Choose From

Basic Model (MBC500B)

  • Rotor levitates; manual spin capability only
  • Perform SISO identification; MIMO identification; classical control design; feedback linearization; nonlinear control synthesis; multivariable control synthesis; adaptive control design

Turbo Model (MBC500T)

  • Air turbine spins rotor up to 10,000 rpm
  • Ability to perform experiments for turbine speed and imbalance control

High-Speed Rotor Dynamics Model  (MBC500R)

  • High-speed version of the Turbo 500 Model; air turbine spins rotor up to 25,000 rpm
  • Two critical speeds (~12,000 rpm and ~22,000 rpm)
  • Additional rotor dynamics and research-level control experiments