This one is centrifugal like the clutch on a go cart nothing to do with magnets. So they work nothing like an AC compressor clutch, they work based on RPM. To my knowledge this is only one of maybe 2 others I have ever seen that use a centrifugal clutch. Had this been an electrically operated clutch I wouldn't have even mentioned it as they are a dime a dozen. The MR-2 used one in the 80's and the Mercedes used them in the 90's and early 2k's and Mazda I think used one for a little while on the IHI Lysholm they used, but don't quote me on that.
Jeff