Download Advanced Computer Techniques in Applied Electromagnetics by Slawomir Wiak, Andrzej Krawczyk, Ivo Dolezel PDF

By Slawomir Wiak, Andrzej Krawczyk, Ivo Dolezel

ISBN-10: 1586038958

ISBN-13: 9781586038953

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Especially the “magic T” method seems to be very effective whether the question is the shape of crack determining or very quick method not demanding any computation but only using suitable calibrated aid. From the graph comparing three methods the resonator method is workable in spite of the fact that in Fig. 4 it does not show markable difference. The presented sensitivity was given by the quality factor of the used resonator, and can be improved by using a resonator with high sensitivity (approximately of 15000–20000) and this is not its only feature because also the detuning of the resonator can be very sensitive representation of the crack depth.

The permeability function of the magnetic anisotropy can then be written as Λ ( x, t ) = μ0 μ 1 , = 0 δ ( x, t ) δ ′′ 1 − Anis ⋅ cos(2 x − ϕ anis ) (1) where δ″ is the equivalent air gap and Anis the peak-to-peak value of the magnetic anisotropy. This permeability function can be decomposed in its Fourier series as follows. Λ ( x, t ) = Λ 0 + ∑ λ =1,2... Λ λ cos(λ (2 x − ϕλ )) (2) Regarding the first field harmonic, the air gap flux density due to the magnetic anisotropy is M. Herranz Gracia and K.

Measurements are conducted in twenty stator samples of an induction motor to study the variability of the magnetic anisotropy. The influence in the electromagnetic and acoustic behavior of the machine is studied then analytically and by FE simulation. The aim of this paper is to predict better the parasitic effects in the machine (torque ripple and radial force on the stator teeth) and so increase the reliability of the machine. Test Setup A variation of the differential method presented in [4] is used here to measure the magnetic anisotropy of the stator of an induction motor.

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