Talk:Electropermanent magnet

How long do they last?

This article needs a sentence on how long they last before the weak material loses its magnetization. Because, being that weak and changeable, it probably won’t be very long. — Preceding unsigned comment added by 89.0.208.91 (talk) 18:04, 13 April 2014 (UTC)

Page contains fundamental errors

Derivations in the article's section 'Magnetic circuit analysis' are wrong. The basic relationship (from simple electrical circuit analogy)

$\Phi _{AlNiCo}+\Phi _{NdFeB}=\Phi _{gap}$

is not satisfied. Also you cannot write

$\Phi _{AlNiCo}={\frac {MMF_{AlNiCo}}{{\mathcal {R}}_{AlNiCo}}}$

and the same for NdFeB. It is instead true that

$MMF_{AlNiCo}-\Phi _{AlNiCo}\cdot {\mathcal {R}}_{AlNiCo}=MMF_{NdFeB}-\Phi _{NdFeB}\cdot {\mathcal {R}}_{NdFeB}=\Phi _{gap}\cdot \left({2\cdot {\mathcal {R}}_{gap}+{\mathcal {R}}_{hiperco}}\right)$

The article section should be rewritten and the results verified. Prex (talk) 17:04, 27 June 2016 (UTC)

Dubious example of cabinet magnetic latch

How is the electric current involved in the magnetic cabinet latch pictured in File:EPM 1.png? -- Beland (talk) 07:21, 30 July 2016 (UTC)

This image has since been removed from the article. -- Beland (talk) 23:34, 18 February 2024 (UTC)