Patent ID: 6680555
Filing Date: 2004-01-20
Classification: H02K

Abstract:
A hysteresis unit (1, 23) comprising a magnetic north pole (4) around an axis of rotation (14), alternating at a distance in a peripheral direction (15) from a south pole (5) situated in a magnet body (2, 3) having a magnet coil (6), a movable hysteresis ring (16) having a slight play relative to said poles (4, 5) is connected with a rotor (17), and peripheral surfaces of the north pole (4) and south pole (5) lie on the same circle and opposite to an adjacent peripheral surface of said hysteresis ring (16), the moveable hysteresis ring (10) surrounds said north pole (4) and said south pole (6), said poles being formed by pole fingers (4, 5) which, departing from axial front walls of said magnet body (2, 3) are aligned upon each other and are spaced from each other a greater distance than from said hysteresis ring (16) and said hysteresis ring (16) abuts by a peripheral surface on said rotor (17), and wherein said pole fingers (4, 5) are interconnected by a non-magnetizable material.