In this paper, a design technique is proposed for a disturbance feedforward compensation control to attenuate disturbance responses in an active magnetic bearing system, which is subject to base motion. To eliminate the sensitivity of model accuracy to disturbance responses, the proposed design technique is an experimental feedforward compensator, developed from an adaptive estimation, by means...

A signal processing technique is presented by which the position of a rotor supported in magnetic bearings may be deduced from the bearing current waveform. The bearing currents are presumed to be developed with a two state switching amplifier which produces a substantial high frequency switching ripple. This ripple is demodulated using a model reference parameter estimation technique which ext...

This work presents a new method of formulating the current to force relationship for a three-pole radial magnetic bearing. This relationship is readily inverted to yield a general mapping from force to current that can be realized by a three-phase motor drive. Position dependence of the bearing forces and force slew rate limiting implications are also explored.

Combined magnetic bearing with radial and axial unites is an important supporting element for high speed energy density motor. Accurate calculation of the field a key to design optimise Radial Axial Magnetic Bearing (CRAMB). This study focuses on analytical method Unite CRAMB. The model based subdomain method. Laplace's equations in air-gap are solved by variable separation large diameter rotor...

The magnetic-liquid double suspension bearing (MLDSB) is a new type of bearing, with electromagnetic as the main part and hydrostatic supports auxiliary part. It can greatly improve capacity stiffness rotor-bearing systems suitable for medium speed, heavy load, frequent starting occasions. Compared active system, traditional protective device replaced by system in MLDSB, impact-rubbing phenomen...

This paper presents both the dynamic modelling and study of variation certain physical parameters (pole area, gap base current) that change magnetic stiffness a radial heteropolar Rotor Magnetic Bearing (RMB) aiming at analysis magnitude its control current for three different equilibrium points. The RMB is modelled as fully uncoupled symmetric active 8-pole bearing. performed using spectral cu...

Single crystals of RMg 2 Cu 9 (R = Y, Ce-Nd, Gd-Dy, Yb) were grown using a high-temperature solution growth technique and were characterized by measurements of room-temperature x-ray diffraction, temperature-dependent specific heat, and temperature-and field-dependent resistivity and anisotropic magnetization. YMg 2 Cu 9 is a non-local-moment-bearing metal with an electronic specific heat coeff...