Electromagnet + Permanent Magnets
Electromagnet + Permanent Magnets
(OP)
I was just wandering if you were to place permanent magnets onto the core of an electromagnet, would it have the same effect as stacking permanent magnets to increase strength?
As in if I had an electromagnet that wasnt quite strong enough, and there was no addition power available, could i just slap a magnet on it? Does it depend on the core of the electromagnet?
Just trying to satisfy a curiosity.
As in if I had an electromagnet that wasnt quite strong enough, and there was no addition power available, could i just slap a magnet on it? Does it depend on the core of the electromagnet?
Just trying to satisfy a curiosity.





RE: Electromagnet + Permanent Magnets
If your electromagnet is powered by dc, it will act similar to a permanent magnet. Although I'm not sure exactly what you meant by stacking to increase strength. Certainly if you stack in a manner to reduce the final air gap between N and S you will increase strength. In any even strength of flux in air would be mmf over reluctance.
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: Electromagnet + Permanent Magnets
There are also designs that use very low coercive PMs as EM cores. In these you pulse the EM, it magnetizes in the desired polarity, and then provides constant field. This lets you draw low power since the EM only pulses when the field is changed. This is how one variety of the 'flipping dot' highway signs works.
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm