Design of a micromagnetic bearing actuator

LiJiang Qin; Ronald B. Zmood

doi:10.1117/12.364439

29 September 1999 Design of a micromagnetic bearing actuator

LiJiang Qin, Ronald B. Zmood

Proceedings Volume 3891, Electronics and Structures for MEMS; (1999) https://doi.org/10.1117/12.364439
Event: Asia Pacific Symposium on Microelectronics and MEMS, 1999, Gold Coast, Australia

Abstract

A micro magnetic bearing actuator, with an outside diameter of 2.6 mm, is being fabricated at RMIT. The rotor of the bearing actuator is structured to operate with active control in the radial directions while being supported passively in the axial direction. This paper addresses the design problem for micro magnetic bearing actuators. The key issue in the design is the evaluation of magnetic forces. By applying the 'fringing range method' developed by the authors, a magnetic circuit model is developed for this actuator, which is used for calculating the flux densities at key locations and the magnetic forces on the rotor. Expressions for magnetic forces have been developed previously and a design procedure is proposed in this paper. It is found by using these expressions and the proposed procedure, that we can easily investigate the influence of design parameters on actuator performance. Design results for the micro magnetic bearing are given in detail.

Citation Download Citation

LiJiang Qin and Ronald B. Zmood "Design of a micromagnetic bearing actuator", Proc. SPIE 3891, Electronics and Structures for MEMS, (29 September 1999); https://doi.org/10.1117/12.364439

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