By Miklos Hetenyi
A complete mathematical research of the elastically supported beam
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Additional info for Beams on Elastic Foundation: Theory with Applications in the Fields of Civil and Mechanical Engineering
25] allow us to point out the elementary stages in calculating a magnet and the important characteristics to use them. 9. 10. Characteristics of a magnet. The supplier gives the unit characteristics in plain lines. 24] gives the right hand side in dashes. Point M then represents the function point of the magnet. Evershed’s criterion allows the magnet volume to be minimized while placing the function point at point N Theoretical Tools and Materials 31 From the second relationship we deduce that the volume of the magnet is at its minimum when the product (BaHa) is at its maximum (Evershed’s criterion).
Soft materials Used to channel the magnetic field and to increase the value of flux density, magnetic materials have accompanied the evolution of electrical machines from the beginning. The first of these materials is iron, which needs to be obtained as pure as possible thanks to a metallurgical process in order to facilitate its magnetization and to prevent its own ageing. 26 Non-conventional Electrical Machines The cores of alternator rotors of nuclear power plants are thus made from a single piece machined in the factory which produces the machine.
Positioning of the problem. 1. Definition A low-speed generator or actuator is characterized, beyond the notion of speed, by the result of important mechanical forces in view of the methods and materials used. As a general rule, it will need to guarantee motive or generating operation under constraints on mass or size, while reducing the chain of mechanical transmission. In this context, we must consider at first sight two types of converter: – those which, intrinsically, produce slow movements based on physical behaviors giving large forces.