Hybrid Coarse and Fine Controller Tuning Strategy for Magnetic Levitation System

  • Shradha KishoreEmail author
  • Vijaya Laxmi
Research Paper


The magnetic levitation system requires a finely tuned controller to suspend a ball in the air. Any imbalance in the force balance condition might result in high fluctuations causing the ball to fall out of levitation. A hybrid tuning strategy based on successful levitation and minimization of vibrations has been designed and tested in real time. The proportional–integral–derivative controller has been tuned in two stages. The parameters of the controller have been calculated by the traditional pole placement technique for coarse tuning and evaluation of bounds. Nature-based non-traditional optimization techniques have been used to minimize the integral of the absolute error within this threshold limit for finer tuning. This novel strategy has been employed to find the best combination of the controller parameters such that levitation is ensured by coarse tuning and error is minimized by fine tuning. Real-time robustness analysis has also been done by means of rejection of external disturbance induced manually in the levitated stage.


Magnetic levitation system Hybrid tuning Non-traditional optimization techniques Integral of the absolute error Coarse tuning 



This research work has not been funded by any agency.

Compliance with Ethical Standards

Conflict of interest

There are no conflicts of interest.


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Copyright information

© Shiraz University 2019

Authors and Affiliations

  1. 1.Birla Institute of TechnologyMesra, Ranchi. Patna CampusIndia

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