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How do I convert an Electromagnetic brake or lock? Answered

Hi Everyone,

I've been searching for a small (20 to 30mm Dia) disc shaped EM lock for a project I'm working on but can't find any. This type of lock's function, where when the electrical power is turned on the magnet activates, attracting a pin or plate, is what I need it to do but I can't find them small and flat enough. I then found some 24V EM brakes for a "Duplicator" (copy machine?) on Ebay where the size may be ok but if they were flatter it would be better. From what I understand these work the opposite way. The brake pad is normally engaged ("locked") to the hub by a spring, then when electrical power is turned on, the brake pad separates from the hub allowing it to rotate. Is this correct?

Would it be possible to convert the brake into a lock merely by reversing the wiring or would I need to reverse the direction of the winding? Would that work to then attract a plate when it is turned on?

Also, how much could I reduce the voltage and have it still attract a metal plate with a decent strength - say from 1/4" away?

Thanks for you help! :)

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