Abstract
Bearingless motor development is a substitute for magnetic bearing motors owing to several benefits, such as nominal repairs, compactness, lower cost, and no need for high-power amplifiers. Compared to conventional motors, rotor levitation and its steady control is an additional duty in bearingless switched reluctance motors when starting. For high-speed applications, the use of simple proportional integral derivative and fuzzy control schemes are not in effect in suspension control of the rotor owing to inherent parameter variations and external suspension loads. In this paper, a new robust global sliding-mode controller is suggested to control rotor displacements and their positions to ensure fewer eccentric rotor displacements when a bearingless switched reluctance motor is subjected to different parameter variations and loads. Extra exponential fast-decaying nonlinear functions and rotor-tracking error functions have been used in the modeling of the global sliding-mode switching surface. Simulation studies have been conducted under different testing conditions. From the results, it is shown that rotor displacements and suspension forces in X and Y directions are robust and stable. Owing to the proposed control action of the suspension phase currents, the rotor always comes back rapidly to the center position under any uncertainty.
Highlights
Contemporary industry needs high-speed motor drives in aerospace compressors, flywheel technology-based electrical energy storage devices, and electric vehicles [1,2]
Magnetic bearing motors have been widely researched to solve the difficulties caused by conventional mechanical bearings
A comparison study was undertaken between robust controllers such as sliding-mode controllers (SMC) and Global Sliding-Mode Control (GSMC) to obtain minimized eccentric effect under different parameter varying conditions
Summary
Contemporary industry needs high-speed motor drives in aerospace compressors, flywheel technology-based electrical energy storage devices, and electric vehicles [1,2]. Several difficulties may occur when a conventional mechanical bearing is used to support the shaft of a high-speed electric motor. Mechanical bearings in high-speed applications increase frictional drag and decrease the performance of the machine. This results in decreasing the service life of bearings due to heavy wear and tear, and in turn increases the maintenance requirements of the machine. Magnetic bearing have advantages such as friction-free and high-speed operation compared with conventional motors, which improves the longevity of the drive. Magnetic bearings are widely used in energy transport, the machine processing industry, aerospace, robotics, and other high-tech areas [3,4,5]
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