Analysis And Research Of Active Magnetic Suspension Rotor Rigidity & Damping

The magnetic suspended rotor is a new, advance high technology product. Because of it has the advantages, such as frictionless, no wear, without lubricating, no pollution, low consuming and long life and so on, the magnetic suspended rotor is applied to such as high and super high speed, vacuum condition and some of the special condition and so on. Along with the modern revolving mechanical rotational speed large scale enhancement, the magnetic suspended rotor supporting characteristic has more and more influences on many fields, for example rotor system stability, dynamic characteristic, revolving precision, nearly control overall system stable. In many situations, the magnetic suspended rotor supporting characteristic has seriously restricted this technical promoted application.By the magnetic force bearing system rigidity and damping being analyzed, relations between magnetic force bearing system rigidity and damping and system design parameter were analyzed in this thesis. And relations with central controller transfer function relation were analyzed. The impact of the rigidity and damping was analyzed because of the rotor space displacement change. The impact of the rigidity and damping was analyzed from PID control parameters. When the active magnetic bearing system design parameters were determined, the expectation rigidity damping characteristic can be obtained and the system stable movement can be caused by the reasonable selective system controller transfer function (frequency loud characteristic).The magnetic suspension rotor supporting characteristic was researched by the simulations and the experiments in this thesis. PID controlled variable changes were simulated by the MATLAB software. The influence between K_p(the scale factor constant), T_i (the integration time constant), T_d (the differentiating time constant) and the rigidity and the damping was analyzed. Thus the thesis is helpful in the control design.Finally by the displacement change analysis of the loading test, the rigidity change rule was obtained. And further the rigidity theory of the magnetic suspended was analyzed and demonstrated. The rotor rigidity nonlinear characteristic was researched. When the PID parameters and displacement were invariable, the rigidity stability was researched by the repetition force .All the research is beneficial in the further research of magnetic suspension rotor technical design on the modeling, the optimization, the dynamic design. And this thesis is helpful in high speed and precision magnetic suspension rotor system design and manufacture.