Characteristics of the Magnetic System of Magnetic Bearing Biased with Permanent Magnets Attached to a Rotor

The characteristics of radially interacting magnetic systems are examined with respect to magnetic radial bearings consisting of permanent magnets for biasing and electromagnets for control. The permanent magnets with axial magnetization are positioned on a rotor and share the magnet poles with the electromagnets. The electromagnet coils of a pair of opposing stators are connected in series and are driven by a single power amplifier. The magnet cores are made of solid iron. The static and dynamical characteristics of the magnetic flux are measured with fixed airgap. The results are compared with the numerical results.