This calculator will allow you to calculate the value of inductance of a given coil quickly by inserting the available data of the coil such as number of turns, loop and wire diameter, and relative permeability
Output
H
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hi . how do i get in touch with you via email. I need help on a school project that includes electromagnetism
Tapiwa, you can explain it here through comments, if possible I’ll try to help….
My project involves controlling the closure of a car door to prevent it from slamming using electromagnet.if it’s moving too fast it can be repelled for a second and after the delay it gets attracted .so how can I make the magnet change polarity for jus a moment to repel an object and then attract it again.if you can help with a circuit or a similar one and things you think I might need.im sort of stuck
The polarity of electromagnet can be changed with a DPDT relay. Trigger the relay with a reed switch as soon as the door is about to slam so that the DPDT relay triggers and reverses the electromagnet polarity.
so is a h bridge dual motor driver necessary and do you happen to have a circuit that may be similar and involves a reed switch and DPDT relay
only a DPDT relay and a reed switch or a micro switch is all that’s required for changing the electromagnet polarity..if possible I’ll try to draw it for you.
Most of your articles easy to follow. One problem we often face is where to get spares particularly IC in kolkata
market. where to get charts of relative permeability.
Thanks a lot.
Rabin Tarafdar
Thank you Rabin, I am based in Mumbai so I don’t know much regarding the parts availability in Kolkata…I would rather recommend buying from an online shop, from where you can buy any desired part as per your requirement.
Some information regarding relative permeability can be learned from this online post:
https://en.wikipedia.org/wiki/Permeability_(electromagnetism)