MAGNETIC FORCE CONTROL DEVICE AND MAGNETIC BODY HOLDING DEVICE USING SAME

The present invention relates to a magnetic force control device for controlling a magnetic force on an interaction surface by controlling an arrangement state of a freely rotating permanent magnet by means of a coil, and a magnetic body holding device using the same. A magnetic force control device according to an exemplary embodiment of the present invention includes: a first pole piece having an interaction surface, made of a ferromagnetic material, and configured to be in contact with an N pole of a permanent magnet; a second pole piece having an interaction surface, made of a ferromagnetic material, and configured to be in contact with an S pole of the permanent magnet or another permanent magnet different from the permanent magnet; a rotary permanent magnet configured to be rotatable to define a first arrangement state in which an N pole thereof is magnetically connected to the second pole piece and an S pole thereof is magnetically connected to the first pole piece and a second arrangement state in which the N pole is magnetically connected to the first pole piece and the S pole is magnetically connected to the second pole piece; and a coil wound around at least one of the first pole piece and the second pole piece, in which switching between the first arrangement state and the second arrangement state is performed by rotating the rotary permanent magnet by controlling a current applied to the coil, such that magnetic force on the interaction surfaces of the first and second pole pieces is controlled.