QuickField Example Transformer model 2D vs 3D

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Transformer model 2D vs. 3D • transformer magnetic field, 2D vs 3D FEA finite element analysis • Example courtesy of Sergey Chishko • When modeling an electromechanical device, a designer needs to keep in mind that a 2D problem set introduces an error in a field distribution in comparison with a 3D problem solution. However, a solving process of 2D problems is multiple times faster than of 3D. In this example the main (front) and side views of the transformer are modeled to demonstrate that a contribution of front and end sides of a coil to the total magnetic flux in the core is negligible. • Problem type: • Plane-parallel problem of DC magnetics. • Problem: • Obtain and compare the values of magnetic flux over the cross section of a transformer leg holding the coil for transformer's front and side view problems sets. • Solution: • To study the impact of end effects on the total magnetic flux in the transformer two models are simulated: front view and side view. • Front-view model (2D) considers only a part of a coil with a current direction in and out of the plane and neglecting end effects of front and end coil parts with currents flowing along the plane. Side-view (2D) model considers only front and end coil parts. • Both models features the same number of turns of the coil and the current. • Results: • Front-view model magnetic flux is -77.7 uWb (98.3%). • Side-view model magnetic flux is -1.3 uWb (1.7 %). • Coil end parts produce only 1.7% of the total magnetic flux and could be neglected in most cases. • Magnetic flux in cross sections of the transformer in front and side models • http://quickfield.com/advanced/transf...

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