Converting 12v to 24v

[Oldbikerider]

If it's just a permanent magnet motor, on 12V it will simply run at half speed and have a lower stall torque. Will this be a problem? How much of the speed and torque performance of the device do you need?

Graham.

[Cecil]

I don't think he is talking about a motor.. I'm guessing that the electromagnet will engage or disengage a clutch separate from the van door motor. I don't see anywhere that a converter is illegal, but just remember, the 12 volts will drop to about 7 volts sometimes, especially in pushing matches.