| 摘要 |
An electromagnetic clutch includes a coil generating a first magnetic flux or a second magnetic flux depending on the direction of current flowing therein, a stationary core accommodating therein the coil, a stationary magnet providing a magnetic flux that opposes the first magnetic flux, a rotor rotatable concentrically with a rotatable shaft, a moving core fixed to the rotor, a moving magnet providing a magnetic flux that opposes the second magnetic flux, a sun gear fixed to the rotatable shaft, an internal gear fixed to the rotor, a planetary gear meshed with the sun gear and the internal gear, an arm supporting the planetary gear, a pulley rotatable concentrically with the rotatable shaft, a first armature being capable of coupling to the stationary core, and a second armature being capable of coupling to the moving core.
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