So I know this question is rather specific, but im hoping someone can help me answer it.

I have a circuit that i've designed where I have an electromagnet thats switched on at a given point. The electromagnet was made by me and is terribly inefficient to produce. I figured a relay uses an electromagnet to complete a circuit, so the question is such: how can I calculate its magnetic field? I know it can measure it using an iphone app that makes use of the hall effect sensors but im hoping I can work it out roughly before i purchase a batch.

  • \$\begingroup\$ Break it open, count number of turns. L=N^2*Al. \$\endgroup\$
    – winny
    Mar 22, 2017 at 22:55
  • \$\begingroup\$ If you know the current, and the geometry, you solve some differential equations with boundary conditions. There are materials properties for the (steel?) that must be known, that will depend on the material history (so, did you anneal it?). \$\endgroup\$
    – Whit3rd
    Mar 23, 2017 at 9:38


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.