Abstract: The present invention relates to a variable-speed power transmission clutch system which enables a plurality of load shafts to be driven corresponding to one power shaft by an eddy current generated by magnetic force and a rotating magnetic field.

Abstract: The present invention relates to a non-contact no-load power transmission device which can transmit power in a non-contact no-load state by using a magnetic-to-nonmagnetic structure. For this purpose, provided is a non-contact no-load power transmission device characterized by operating in a non-contact manner and comprising: a first disc unit 10 coupled to one of a power shaft or a load shaft and having a magnetic body on one side surface; and a second disc unit 20 coupled to the power shaft or the load shaft that corresponds to the first disc unit 10 and formed of a nonmagnetic body that attracts the magnetic body.