Comments on: Older Locomotives With Demagnetized Motors https://blog.model-train-help.com/2021/03/older-locomotives-demagnetized-motors.html?utm_source=rss&utm_medium=rss&utm_campaign=older-locomotives-demagnetized-motors Model railroads and model trains Wed, 21 Apr 2021 17:52:44 +0000 hourly 1 https://wordpress.org/?v=6.9.4 By: Frank B https://blog.model-train-help.com/2021/03/older-locomotives-demagnetized-motors.html#comment-51572 Wed, 21 Apr 2021 17:52:44 +0000 http://blog.model-train-help.com/?p=6080#comment-51572 I think it possible that you can obtain modern neodymium magnets of a suitable size and shape to replace the old magnets.

But you may need to grind them down to fit, or insert soft iron shims to bring them up to the right size.

Magnets can lose their strength due to excessive heat, or through mechanical shock.

Further reading for your interest:
https://en.wikipedia.org/wiki/Magnet
https://en.wikipedia.org/wiki/Magnetism
https://en.wikipedia.org/wiki/Curie_temperature
https://en.wikipedia.org/wiki/Electric_motor

]]> By: David Stokes https://blog.model-train-help.com/2021/03/older-locomotives-demagnetized-motors.html#comment-49451 Wed, 31 Mar 2021 04:54:28 +0000 http://blog.model-train-help.com/?p=6080#comment-49451 Captain Slow (James May of Top Gear fame) is a railway modeller and demonstrated a Hornby magnetiser on one of his videos. If they are stall available, that is what you need.

]]> By: Frank B https://blog.model-train-help.com/2021/03/older-locomotives-demagnetized-motors.html#comment-49432 Wed, 31 Mar 2021 01:31:39 +0000 http://blog.model-train-help.com/?p=6080#comment-49432 Old Hornby (open frame) motors apparently needed this, and I understand that Hornby sold a re-magnetising device to shops and moodel train repairers.

I would guess that more modern motors use a better magnetic materials (such as neodymium alloys) that does not need this.

]]> By: robert https://blog.model-train-help.com/2021/03/older-locomotives-demagnetized-motors.html#comment-49426 Wed, 31 Mar 2021 00:58:37 +0000 http://blog.model-train-help.com/?p=6080#comment-49426 Older Ferro magnets will lose magnetism over time especially if removed from the motor, but the newer Neomodium magnets are much stronger and longer lasting. I have both in Triang locos and the neo magnets give much better performance.
Robert

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