Energy stored in permanent magnets

There has been some confusion over the energy stored in a permanent magnet, with many texts and some finite element packages giving incorrect values. We demonstrate the correct formulation, under both normal operation and partial demagnetization, and discuss the physical meaning of stored energy in a permanent magnet.

[1]  R. Parker.  Advances in Permanent Magnetism , 1990 .

[2]  P. Campbell.  Permanent Magnet Materials and their Application: Applications , 1994 .

[3]  T. Miller,et al.  Prediction of cogging torque using the flux-MMF diagram technique , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.