Stacking factor: Difference between revisions
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[[Category:Electric transformers]] |
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Revision as of 01:28, 2 March 2021
The stacking factor (also lamination factor or space factor[1]) is a measure used in electrical transformer design and some other electrical machines. It is the ratio of the effective cross-sectional area of the transformer core to the physical cross-sectional area of the transformer core. The two are different because of the way cores are constructed.
Transformer cores are usually made up of thin metal sheets stacked in layers. The layers are laminated with varnish or other insulating material. The purpose is to reduce eddy currents in the core, while keeping a high magnetic flux. Since the insulator is non-ferro-magnetic, little, if any, magnetic flux is contained within it. It is mainly in the metal sheets. The insulation takes up a finite space, so the effective area the flux occupies is less than the physical area of the core.[2]
The stacking factor is used when calculating the magnetic flux density within the core. Because the flux is confined within a smaller area in a laminated core, the flux density is higher than it would be in a homogeneous core.[3]
Laminated cores always have a stacking factor less than unity; a stacking factor of unity implies no laminate at all. Stacking factors are typically 0.95 or higher for transformer cores[4] and machine stators.[5] However, cores made from amorphous metal have a stacking factor of around 0.8, compared to 0.96 for silicon steel.[1]
References
- ^ a b Barry W. Kennedy, Energy Efficient Transformers, p. 140, McGraw Hill Professional, 1998 ISBN 0070342881.
- ^ "Laminated cores simulation", Quick Field, accessed and archived 29 September 2019.
- ^ I. Boldea, Syed A. Nasar, Linear Electric Actuators and Generators, p. 12, Cambridge University Press, 2005 ISBN 0521020328.
- ^ W.G. Hurley, W.H. Wölfle, Transformers and Inductors for Power Electronics, p. 109, John Wiley & Sons, 2013 ISBN 1118544676.
- ^ Jacek F. Gieras, Rong-Jie Wang, Maarten J. Kamper, Axial Flux Permanent Magnet Brushless Machines, p. 81, Springer Science & Business Media, 2008 ISBN 1402082274.
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