This effect is described as field displacement the

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Unformatted text preview: lloys. The third column indicates the reduction factor for the switching distance of an inductive proximity sensor. This simple dependence does not apply in the case of ferromagnetic metals and alloys. With ferromagnetic material, considerably higher losses are created by the eddy currents in the attenuated material than with non-ferromagnetic material. m Ω ⋅ mm2 Conductor Reduction factor Conductivity Copper 56.0 0.25 – 0.40 Aluminium 33.0 0.35 – 0.50 Brass 15.0 0.35 – 0.50 Chrome-nickel 1.0 0.70 – 0.90 Table 11.1.1: Conductivity and reduction factors of various materials 160 © Festo Didactic GmbH & Co. KG • FP 1110 11. Physical fundamentals 3 1 2 Magnetic stray field HS (1) Eddy currents through magnetic field HW (2) Attenuating material (3) Fig. 11.1.5: Schematic field pattern of inductive proximity sensors The field HW created as a result of the eddy currents acts against the generating field HS. This effect is described as field displacement. The skin effect has another, however le...
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