6-step fuzzy-merged controller for eccentricity of 3-pole vertical magnetic bearing

Centrifugal force caused by eccentricity in a vertical magnetic bearing (VMB) is dealt with an innovative design by featuring 1) 3-pole 2) 6-step 3) PD fuzzy switching controller 4) hybrid controller. The hybrid controller is composed of a fuzzy switching controller and a traditional ID controller. Fuzzy switching controller regulates the instability of plant when pump shaft deviates by a small perturbation from the nominal gap. The traditional ID controller compensates for the centrifugal force caused by eccentricity. In the simulation, 6-step switching works as a relay race in terms of a competitor. Simulation results approve the approach developed in this paper be feasible to overcome the effect arisen from eccentricity.