CONTROLLER OF ELECTROMAGNETIC CLUTCH

In an electromagnetic clutch 70 designed to change over a power transmission mechanism between a coupled state and an uncoupled state for enabling and disabling transmission of a motive power between an engine and a rotating electric machine through the medium of the power transmission mechanism, a control apparatus for the electromagnetic clutch includes an excitation attenuating means 120, 130 for decreasing gradually the intensity of excitation of a field coil 71 of the electromagnetic clutch 70 while switching the excitation alternately from one to the other direction when the coupled state is changed over to the uncoupled state for the purpose of preventing generation of loud collision noise by the electromagnetic clutch.