Magnetic Bearings and Levitation Dynamics

In this study, a fuzzy variable graded Sliding Mode Controller has been designed for a twin rotor multi-input multi-output system (TRMS). The main purpose of this study is to change the sliding surface of the sliding mode controller which is adaptively designed as variable order with the help of fuzzy logic and also t…

Purpose This study aims to analytically model and mitigate unbalanced magnetic forces (UMF) in a 6/5 variable flux reluctance machine (VFRM) by proposing a dual-stator topology. The objective is to reduce radial-force imbalance and mechanical deformation while maintaining comparable electromagnetic performance. Design…

This study investigates and compares Sliding Mode Observer (SMO)-based rotor position and speed estimation methods used in sensorless drive applications of permanent magnet synchronous motors (PMSMs). The estimation performance of these methods in different speed domains is evaluated. Comparative analyses were perform…

Abstract This paper presents a new method for identifying the nonlinear parameters of a connection used to couple two structures. The proposed Nonlinear Internal Force Identification Method (NIFIM) calculates the nonlinear internal forces and the corresponding relative displacements at the nonlinear connections by usi…

In this study, we present a resonant rotary transformer (RT) with an integrated rectifier for brushless excitation of wound rotor synchronous motors in electric vehicle applications. The primary-side of the RT employs an LCC resonant tank with Litz-wire winding and a high-frequency ferrite backplate, while the high-sp…

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This study investigates the forced transverse vibration of a thin rotating annular disc subjected to time-varying point forces that are fixed in space and act perpendicular to the disc surface. Earlier analytical treatments of this problem have almost always been restricted to a single support condition, most often th…

Residual vibration is the unwanted oscillation that continues in a flexible structure after it has finished moving. In robotic systems that carry flexible parts, this vibration reduces positioning accuracy and increases the time needed to settle before the next operation can begin. This paper presents an open-loop met…

The rising need for high efficiency and precise control has intensified research on wound rotor synchronous motors (WRSMs). Accurate torque estimation is crucial for performance optimization, energy efficiency, and reliable operation. However, traditional physics-based models often fail to capture nonlinearities such…

This study presents the design, manufacturing, and prototype-level evaluation of a high-efficiency interior permanent magnet synchronous motor (IPMSM) developed for compact electric vehicle traction applications. The proposed motor employs a 12-slot/10-pole spoke-type rotor topology and was evaluated in terms of elect…

Abstract This study investigates the magnetic restoring forces in axial flux permanent magnet synchronous machines (AFPMSMs) under rotor tilting and radial displacement conditions for three magnet configurations: single magnet, 4-segment Halbach array, and 8-segment Halbach array. Finite element analysis (FEA) was emp…