1 / 16

COLLECTOR AND DIFFUSER EFFECT OF FOREHEAD DISCS ON CYLINDRICAL FERROMAGNETIC CORES

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

rafal
Download Presentation

COLLECTOR AND DIFFUSER EFFECT OF FOREHEAD DISCS ON CYLINDRICAL FERROMAGNETIC CORES

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related