SINGLE AXIS CONTROLLED VERTICALSHAFT REPULSIVE-TYPE MAGNETICBEARING AND CONTROL

[摘要] Single axis controlled repulsive type magnetic bearing (SACRMB) is the most promising bearing due its low cost and simple construction. This bearing has low loss, low noise, no lubrication and no hazards. This paper introduces a vertical shaft SACRMB, consists of permanent magnets for radial stability and electromagnets for levitation & axial stability. SACRMB has tremendous opportunities to become a common choice for house hold to industrial applications. It has been investigated that though SACRMB has radial stability due to repulsive stabilization force by passive permanent magnets but this devise suffers from axial instability. In this paper a PID controller has been designed to make the system axially stable by controlling the current through an electromagnet. It is found that the radial & axial vibrations are under tolerable limit and SACRMB works extremely well.

[关键词] SACRMB;PID controller;magnetic forces;stability;vibration.