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

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)