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The eddy current effect of laminated steel is significant to the design of high frequency transformer(10 kHz–100 kHz). In this paper, the finite element method considering the micro eddy current is proposed. And, the algorithm is discretized and implemented by Matlab. In order to verify the algorithm, a magnetic ring of nanocrystalline soft magnetic is measured at 50k Hz and 100 kHz. The simulation...
When a transformer is de-energized, the magnetic core material will contain a certain amount of residual magnetic flux. This flux may intensify saturation and lead to high transient in-rush current upon remagnetizing. This paper describes a novel method for analyzing and detecting the residual flux, based on the nonlinear magnetizing characteristics (also called – characteristics) of the core...
This paper investigates the nonlinear model of the permanent magnet synchronous machines (PMSMs). In order to incorporate the structural and saturation saliencies, two parameters are defined to indicate the saturation ratios. An analytical model is derived and the inductance matrix is expressed in both stationary and rotating reference frames, respectively. An incremental inductance measure system...
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