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The magnetic bearing system is a complex mechatronic systems involving many disciplines , including mechanical engineering, mechanics, electrical engineering , electronics , control engineering , computer science, and rotor dynamics . Relative to the traditional contact bearings , magnetic bearings have many advantages , because there is no mechanical contact , thus there is no friction and wear , and will not produce friction heat , does not require lubrication , and can work in a hot environment , can achieve high speed and long service life , this series of advantages makes the magnetic bearing has a broad application prospects , magnetic bearing overall performance can be significantly improved in addition to the civilian industry to replace the traditional mechanical bearings , magnetic bearings in a variety of rotating machinery has a particularly important application in the field of military and space technology , such as high-temperature gas turbines , ultra-low temperature pump , a new generation of fighters microscale machining , space gyro , energy storage flywheel, missile launchers and other machinery and electronic equipment have a magnetic bearing application . Therefore has important implications for the study of magnetic bearings . The direction of this study is the magnetic bearing control structure framework of the magnetic bearing system and how it works , according to the Maxwell electromagnetic field theory , first bearing rotor force derived its electromagnetic forces acted on the expression established on the basis of a mathematical model of a single degree of freedom . According to obtained the kinetic equation of the magnetic bearing rotor model , and then derive the transfer function of the system , simulation experimental model in MATLAB environment using the classic control theory - PID control method , derived the system parameters of the control performance affect the results , the model originally established a feasible linear processing , ideal control effect case , taking into account the nonlinearity of factors and non-linear factors of the magnetic bearing the dynamic performance are discussed , including a discussion of the maximum carrying capacity of the bearing . This article does not control system hardware design , but the conclusions for the actual controller design , and has a certain reference value of the actual parameter tuning and debugging .
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