Active Magnetic Bearings Case Study

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CHAPTER- 1 INTRODUCTION 1. INTRODUCTION Active Magnetic Bearings (AMBs) have advantages over conventional bearings. Their uncommon features and the appeal towards high speed machines make them attractive for certain common rotor/bearing applications. Thus, AMBs have been researched significantly for a few years, and several advance improvements in performance have been achieved. A magnetic bearing system where the rotor is magnetically suspended. A magnetic bearing system has the advantage that it does not need any oil. This advantage will prevent radioactive contamination of the system in case of the reactor. This in turn makes the surrounding environment safer. As compared to a conventional lubricated…show more content…
1.3 Limitation of AMBs: Magnetic bearings have lower load capacity I. e-maximum load per unit of area than conventional bearings. • Magnetic bearings require power to control the system, and to drive sensors and electromagnets increasing system complexity and initial cost Losses in magnetic bearings is mainly due to eddy currents that limit the rotational frequency of rotors (heating up, driving power). • The eddy current losses can be reduced by dividing the iron core into insulated sheets. Magnetic bearings with high precision control of the rotor position require adequate signal processing and high resolution sensing. 1.4 Developments of AMB s: • AMB technology is a type of Mechatronic application that combines and integrates Mechanics, electronics and computer science. Now a day; it is used in various engineering Fields such as aerospace, reactor applications. • The CSIR-National Aerospace Laboratory, Bangalore and the IGCAR, Kalpak am having collaborated to develop 5 axis levitation of AMBs rig for a reactor application. • Another development of magnetic bearing application is single axis levitation of AMB

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