Improvement of flexible rotor/active magnetic bearings system performance using pi-d control

Abstract

Proportional -integral-derivative (PID) control is the most common control approach used to control active magnetic bearings system, especially in the case of supporting rigid rotors. In the case of flexible rotor support, the most common control is again PID control in combination with notch filters. Other control approaches, known as modern control theory, are still in development process and cannot be commonly found in real life industrial application. Right now, they are mostly used in research applications. In comparison to PID control, PI-D control implies that derivate element is in feedback loop instead in main branch of the system. In this paper, performances of flexible rotor/active magnetic bearing system were investigated in the case of PID and PI-D control, both in combination with notch filters. The performances of the system were analysed using an analysis in time domain by observing system response to step input and in frequency domain by observing a frequency response of sensitivity function.

The annulling of the sudden appearance of an unbalance in rotary machines by using active magnetic bearings

“…Muminović et al, for flexible rotors, propose PI-D control. In [20] they examine the performance of a flexible rotor/AMB system in the case of PID and PI-D control, both in combination with NOTCH filters. Using PID control, Štimac et al have proposed a vibrationdamping model using magnetic forces for a flexible rotor supported in an AMB [21].…”

Frame modal analysis for an electric three-wheel vehicle

“…The result of numerical simulation has a good agreement with the numerical calculation of fundamental theory for turbine runner. Empirical equation compared by numerical study of the elastic rotor has been studied shows that similar natural frequency range [7]. Fluid study of natural frequencies was also investigated to find out the influence of the acoustic of a cylindrical fluid to identify the dynamic response of the disk-like structure.…”