Electromagnet overheating?

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hi,

this first post here, please tell me if should clarify anything.

i'm having problem electromagnet getting hot , can't figure out why. bought intertec its-ms-2015 conrad.

it's 12v 2.5w electromagnet force of 20n.

it's force nice (see some experiments). said get's hot.
some data:

magnet:
r: 70 ohm
u: 21 v
calculated (12/70): 0.1714285714 / 171 a
documented (2.5/12): 0.2083333333 / 208 ma
measured i: 0.17 (in 10a mode) en 155 ma (in 200ma mode)

i use voltcraft usps-600 adjustable dc adapter, put on 12v mode, power it. says can deliver 600ma. measured it's giving 12v.

when mean hot mean can't hold in hands anymore.

any tips appreciated.

any chance of english version of data sheet?
http://www.produktinfo.conrad.com/datenblaetter/500000-524999/502290-da-01-de-elektromagnet_its_ms_2015.pdf


Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > Electromagnet overheating?


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