Electromagnetic coupling apparatus

摘要

To provide an electromagnetic coupling apparatus that is low in manufacture cost and superior in durability with high performance, the electromagnetic coupling apparatus including: a first rotary member constituting a magnetic circuit; a magnetically exciting coil provided to be relatively rotatable inside of the first rotary member; a yoke provided to be rotatable relative to the first rotary member for constituting a part of the magnetic circuit of said first rotary member; and a second rotary member provided to face the first rotary member in the axial direction and having a movable member provided to be movable in the axial direction for constituting a part of the magnetic circuit. The yoke is formed by laminating thin plates in the axial direction.