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[[/Demagnetisation curve]] from second quadrant can be shifted to the first quadrant in order to calculate [[/coenergy]] in a system containing a permanent magnet.

The drawing was based on:
  * Richard J. Strahan, Energy Conversion by Permanent Magnet Machines and Novel Development of the Single Phase Synchronous Permanent Magnet Motor, PhD thesis, Electrical and Electronic Engineering, University of Canterbury, Christchurch, New Zealand, 1998, p.27-40

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{{tag>Coenergy Permanent_Magnets FEM Files}}