Control Performance, Stability Conditions, and Bifurcation Analysis of the Twelve-Pole Active Magnetic Bearings System

The active magnetic bearings system plays a vital role in high-speed rotors technology, where many research articles have discussed the nonlinear dynamics of different categories of this system such as the four-pole, six-pole, eight-pole, and sixteen-pole systems. Although the twelve-pole system has...

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Bibliographic Details
Published in:Applied sciences 2021-11, Vol.11 (22), p.10839
Main Authors: El-Shourbagy, Sabry M., Saeed, Nasser A., Kamel, Magdi, Raslan, Kamal R., Aboudaif, Mohamed K., Awrejcewicz, Jan
Format: Article
Language:English
Subjects:
Behavior
bifurcation diagram
Bifurcations
Classical mechanics
Control algorithms
Control charts
Controllers
Cross coupling
Design
Dynamical systems
Equations of motion
frequency spectrum
Investigations
Magnetic bearings
Nonlinear dynamics
Nonlinearity
Oscillations
Poincaré-map
Power consumption
Proportional derivative
proportional derivative controller
Rotors
Sensors
stability
Stability analysis
Stiffness
twelve-pole system
Vibration
Vibrations
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Summary:The active magnetic bearings system plays a vital role in high-speed rotors technology, where many research articles have discussed the nonlinear dynamics of different categories of this system such as the four-pole, six-pole, eight-pole, and sixteen-pole systems. Although the twelve-pole system has many advantages over the eight-pole one (such as a negligible cross-coupling effect, low power consumption, better suspension behaviors, and high dynamic stiffness), the twelve-pole system oscillatory behaviors have not been studied before. Therefore, this article is assigned to explore the effect of the magneto-electro-mechanical nonlinearities on the oscillatory motion of the twelve-pole system controlled via a proportional derivative controller for the first time. The normalized equations of motion that govern the system vibrations are established by means of classical mechanics. Then, the averaging equations are extracted utilizing the asymptotic analysis. The influence of all system parameters on the steady-state oscillation amplitudes is explored. Stability charts in a two-dimensional space are constructed. The stable margin of both the system and control parameters is determined. The obtained investigations reveal that proportional gain plays a dominant role in reshaping the dynamics and motion bifurcation of the twelve-pole systems. In addition, it is found that stability charts of the system can be controlled by simply utilizing both the proportional and derivative gains. Moreover, the numerical simulations showed that the twelve-poles system can exhibit both quasiperiodic and chaotic oscillations besides the periodic motion depending on the control parameters’ magnitude.
ISSN:2076-3417
2076-3417
DOI:10.3390/app112210839