Patent ID: 6948597

Claim:
An eddy current deceleration device comprising: a rotor mounted on a rotary shaft; a magnet ring arranged facing said rotor and including a first plurality of permanent magnets that are arranged at a prescribed pitch in the a circumferential direction, each permanent magnet having poles of opposite polarity and being oriented such that one of said poles face said rotor and such that the respective polarities of said poles facing said rotor are alternately inverted, and a first magnetic member for connecting said poles of said first plurality of permanent magnets that face away from said rotor; and a magnetic ring arranged between magnet ring and the rotor and including a second plurality of permanent magnets that are arranged at a prescribed pitch in the circumferential direction such that adjacent permanent magnets have poles facing in the circumferential direction which are of a same polarity, and a second magnetic member that holds said second plurality of permanent magnets; at least one of the magnet ring and magnetic ring being freely rotatable, and said second magnetic member having an annular shape and being provided with embedding holes so that said second plurality of permanent magnets are embedded and fixed in said holes.