Research on the Control Systems of Magnetic Bearing

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Abstract
Magnetic bearings with control circuits are very attractive for their frictionless property, but the analytical researches made before in this field are unsatisfactory. The authors studied this problem theoretically and experimentally. First, a mathematical model was constructed by means of linearizing procedures ; next, the root-loci were calculated on a highspeed electronic computer, and the results were compared with experimental ones which were obtained on a real model. Here the authors summarize that : (1) Among the many factors which affect the stability of the control system, the electromagnetic solenoid has the greatest importance. (2) It is seen that the optimum condition of the compensating circuit depends largely upon the distance between the electromagnet and the rotor. Thus, thes analyses will be useful for the deeper understanding of the control systems and for the better design of magnetic bearings.

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