Electromagnet Switch Timer

abdat60
abdat60
@abdat60-rphMSf • Oct 26, 2024

Hello World,

Im trying to design a clamp on a hinge that will clamp shut with two (or one) electromagnets attracting for a set interval of time. I would like the option to raise and lower the time interval with a dial (2 to 10 seconds). When the interval of time has passed I want an opposite current to flow over the electromagnets to make them repel from each other for 1 to 2 seconds and a mechanical device will hold the lever in place away from the base.

I read that a MOSFET can be used to direct the current, any suggestions?

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  • Ramani Aswath
    Ramani Aswath

    @ramani-VR4O43 • Feb 9, 2016

    1. In the open position the magnets are too far away for the magnets (of a reasonable size) to work. It maybe simpler to use a spring on the hinge to do the opening at the end of the set time.

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  • abdat60
    abdat60

    @abdat60-rphMSf • Feb 10, 2016

    I want to manually press them down and just have the magnets hold them in place. the clamp is 15" long.

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  • Ramani Aswath
    Ramani Aswath

    @ramani-VR4O43 • Feb 10, 2016

    abdat60I want to manually press them down and just have the magnets hold them in place. the clamp is 15" long.

    Then there is no issue. You should still consider a spring release at the end of hold down time. Simplifies the circuit.

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  • abdat60
    abdat60

    @abdat60-rphMSf • Feb 10, 2016

    Ahhhhh, good idea. Simpler is better.

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