The results of computational-methodological and experimental studies of the motion of a rotor on an electromagnetic suspension are presented. Analytical methods and computer calculations are used to study nonlinear models. Experimental data are obtained for passage of the characteristic flexural resonance frequency. The investigations reveal the important factors in an electromagnetic suspension, illustrate their manifestation, and yield data to be taken into account in design work for a turbomachine in a nuclear power plant with a 100 tons vertical rotor.An energy conversion unit with a direct gas-turbine cycle for producing electricity in the GT-MGR reactor system is one of the realizations of high-temperature technology which is based on experience in developing helium-cooled reactors, and innovative solutions for turbomachines based on electromagnetic bearings, used to prevent oil contamination of the first loop of a nuclear power plant and for other reasons.The Special Machine Design Office is performing computational and methodological as well as experimental studies of the motion of a 100 tons rotor on an electromagnetic suspension unit. The rotor has its own flexural resonance frequencies, which makes this structure substantially different from the well-known structures. The need to decrease the degree of risk in fabricating full-scale turbomachines requires comprehensive investigations of the dynamics of the rotor by analytical and experimental methods. The main problem of analytical and experimental studies today is determining all conditions for stability of the equilibrium states of the system rotor + control system, since the rotor, by definition, is unstable. This requires conditions which preclude the rotor from touching the safeguarding bearing because this bearing has a limited lifetime.On a practical level, this question of investigating stability can be transformed into the problem of identifying the determining factors out of all factors to be taken into account in design work, including for development of a mathematical model, employed for performing calculations of the dynamics of a rotor in a turbomachine.On a methodological level, the investigations are performed from the simplest computational and physical models to models with gradually increasing complexity. The effects are analytically monitored using more complete mathematical models, which are investigated numerically. The experimental data are compared with the calculations, the computational codes are verified, and the most important parts of these data are refined using more complicated physical models. To this end, a full-scale model, simulating certain conditions of the GT-MGR turbomachine, has been developed and is in operation, and a full-scale model of a turbomachine with expanded possibilities for obtaining experimental data on the electromagnetic suspension in machines of this class is being built. A proportional-differential regulator (minimum necessary configuration of the control system taking account of the aperiodic in...
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