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This work presents the design, FEM based analysis, system modelling, fabrication and elementary experiments on an attraction type electromagnetic levitation prototype using a steel ball. System modelling has been done accurately by evaluation of parameters, determine force, inductance and current vs. air-gap characteristics first using conventional analytical formulation and then using FEM based calculations. These are verified by actual experiments. Excellent correlation between the two sets of results has encouraged the author to consider the possibility of trying to set-up more complex but precise levitation prototypes. Agreement between predicted and measured parameter values also imply that the system modelling is reliable and the set-up fabrication quite alright which leads to accurate design and implementation of controller. A stabilizing controller (lead compensator) has been designed for this simple system and its performance has been FEM-simulated, MATLAB simulated and then practically tested. In this work, all electromagnetic simulations have been done in ANSYS-Maxwell software, system simulations in MATLAB-simulink software and Mathematica unless mentioned otherwise specifically. Finally the complete set-up has been fabricated where a ball has been successfully and steadily levitated.
This work presents the design, electromagnetic analysis, system modelling and fabrication of laboratory prototype for attraction type electromagnetic levitation prototype for a flat plate (65 gm). The major objectives of this work are to evaluate parameters, determine force, inductance and current vs. air-gap characteristics, first using analytical formulation and then using FEM based calculations. The finite element (FE) modelbhas been developed using commercially available standard packages. Good agreement between predicted and measured parameter values also imply that the system modelling is accurate which leads to accurate design and implementation of analog controllers. The analog controllers have been designed, analysed and implemented for the systems. Their performance have been simulated and then practically tested. The attraction type levitation prototype has been entirely fabricated in the laboratory. The prototypes consist of a flat rectangular steel plate of 65 gm mass. This work also presents control and elementary experiments on a flat plate based electromagnetic levitation prototype. Agreement between predicted and measured parameter values also imply that the system modelling is accurate which leads to precise design and implementation of controllers. The stabilising controllers for the set-up have been designed and implemented and their performance have been simulated and then practically tested. Two controllers, an inner current controller (PI) and an outer lead compensator, have been implemented to achieve stable levitation for the plate.
This work presents studies on a rectangular plate-based attraction type levitation prototype. The first work presented a study on a symmetric shaped object whereas this work presents a second case study involving an asymmetric shaped object. A thin steel plate has been successfully levitated under a controlled electromagnet with closed-loop position feedback. This has been achieved without the use of any mechanical restrainer. The entire set-up has been designed, fabricated, mathematically modelled, analysed and experimentally investigated. Both electromagnetic and control system analysis have been conducted and a controller has been designed and implemented. A small signal model linearised about the operating point has been used for control system design and implementation.
This work presents studies on the design, modelling, FE software based electromagnetic analysis, fabrication and experiment on a C-shaped steel plate-based levitation prototype. The last work presented a study on a flat steel-plate object, while this work presents a fourth case study on the effect of shape and mass (on the levitation performance and on the controller) involving a C-shaped object. No mechanical restrainer has been used in the axial (y) direction here. The entire set-up has been designed, fabricated, analytically investigated and experimentally evaluated and verified. The finite element modelling (FEM) has been done using standard commercial package(s). The analytical model has been obtained using specific permeance concepts following Robert Pohl’s method. Good correlation between the predicted and practical results has been obtained here also. The stability against transverse mechanical perturbation has also been investigated. Controller design and implementation is successfully done.
Design, analysis and implementation of an electromagnetic levitation system with tilt control (Multi-axis control).
Design, analysis, and implementation of a large rectangular platform
Design, modelling, fabrication and control of a levitation prototype for a steel ball.
Design, analysis and implementation of an electromagnetic levitation system with single axis control for a rectangular shaped object.
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