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Collector and Diffuser Effect of Forehead Discs on Ferromagnetic Cores

Investigate the impact of forehead discs on cylindrical ferromagnetic cores, analyzing magnetic properties in rod and dumbbell-type sensors. Discuss eigenmodes of magnetization and effective permeabilities for different geometrical shapes, including short cylinders and two-sided cones. Utilize computer simulations to study eigenmodes and corresponding permeabilities, exploring collector and diffuser effects on cores. Conclude that a dumbbell-type core with forehead discs exhibits enhanced magnetization compared to original cylindrical cores.

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Collector and Diffuser Effect of Forehead Discs on Ferromagnetic Cores

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  1. COLLECTOR AND DIFFUSER EFFECT OF FOREHEAD DISCS ON CYLINDRICAL FERROMAGNETIC CORES Josef Blažek – Ivan Mikita Department of Technical Studies Faculty of Aeronautics, Technical University KošiceRampová 7 041 21 Košice Contact E-mail: josef.blazek@tuke.sk Magnetic Measurements 2006

  2. Abstract: This contribution investigates the influence of the collector and diffuser effect of forehead discs on cylindrical ferromagnetic cores and the magnetic properties within the models of rod and dumbbell-type sensors and exciters core especially.

  3. Magnetized ellipsoid(Generally known situation)

  4. This contribution deals with concrete results of application of eigenmodes magnetization theory for bodies of chosengeometrical shapes. • It is possible to define the eigenmodes of magnetization physically by a constant effective(apparent)permeability all over the dimension of a body and thereby, the magnetization of the body is formed the same way as thegeometrical course of an excitation field for the given mode. • By computer simulation, the courses of eigenmodes andcorresponding effective permeabilities for chosen geometrical shapes of magnetizing bodies were resolved, fo • r example,for a short cylinder, a two-sided cone with an inverted shape.

  5. Interaction matrixJ and transfer matrixA

  6. Eigenmodes and eigenvalues of matrix A for short cylinder

  7. Eigenmodes and eigenvalues of matrix A for two-side cone

  8. Eigenmodes and eigenvalues of matrix A for inverted two-side cone

  9. QF geometric model(sensors in uniform MF), FEM

  10. Magnetic line of rod and dumbbell core (sensor) – collector effect

  11. Flux density in cores

  12. B(l) diagrams for sensorcores(Bo = 0.01 T, ma= 95)

  13. QF geometric model( exciters in MF of winding)

  14. Diffuser effect offorehead

  15. B(l) diagrams for exciters(NI = 1500 At)

  16. Conclusions : • A cylindrical core ending in a thin forehead disc, reminding us of a dumbbell appears to be extreme in design. • Value of μa is much as three times as is the maximum value for the original cylindrical cores. • Additionally, this dumbbell-type core is almost homogenously magnetized, i.e. its effective length is nearing to the core length of the cylinder between the foreheads.

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