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Computer-Aided Analysis Of Magnetic Fields In Nonlinear Magnetic Bearings, Mulukutla S. Sarma, Akira Yamamura
Computer-Aided Analysis Of Magnetic Fields In Nonlinear Magnetic Bearings, Mulukutla S. Sarma, Akira Yamamura
Sarma Mulukutla
The high magnetic energy stored in rare earth-cobalt magnets allows the design of lightweight motors and magnetic bearings for high speed rotors. Not subject to wear and with the ability to operate under high vacuum conditions, magnetic bearings appear ideal for applications requiring high rotational speeds such as 100,000 rpm. Important applications are for turbo-molecular pumps, laser scanners, centrifuges, momentum rings for satellite stabilizations, and other uses in space technology. It is the purpose of this paper to present a two-dimensional nonlinear numerical analysis of the magnetic fields in a magnetic bearing, based on magnetostatic assumptions and finite-difference iterative techniques.
Current-Density Distribution In Solid-Rotor Induction Motor, Mulukutla S. Sarma
Current-Density Distribution In Solid-Rotor Induction Motor, Mulukutla S. Sarma
Sarma Mulukutla
The interaction between the eddy currents induced in the solid cylindrical rotor steel structure and the revolving field of the airgap produces the electrodynamic torque. The polyphase induction machine with solid-iron rotor offers advantages in ease of manufacture, in high torque per ampere at standstill, in withstanding high rotational stresses, and in operating in unusual environments. It is the purpose of this paper to present an approximate three-dimensional nonlinear numerical analysis of the solid-rotor induction motor for finding the three-dimensional current-density distribution in the solid rotor, in order to calculate the performance characteristics, based on finite-difference iterative techniques.