An electromagnetic clutch includes a first shaft and a rotor rotatable together around an axis, and the rotor includes a clutch friction surface. A second shaft is disposed coaxially and slidably around the first shaft and drives the rotor to rotate around the axis. An armature facing the rotor is fixed to the second shaft to be displaceable in the axial direction. The clutch further includes a coil that presses the armature against the clutch friction surface when the coil is supplied with electricity, and that releases the armature from the clutch friction surface when the coil is not supplied with electricity. A brake device is provided to continuously apply to the rotor a brake torque which is not less than a slip torque generated between the second shaft and the first shaft and less than a driving torque applied by the second shaft.
展开▼
