Patent ID: 6257380
Filing Date: 2001-07-10
Classification: H02K

Abstract:
A plurality of nominally identical hysteresis brakes of substantially the same construction with each brake providing substantially the same torque output at substantially the same operating current within its operating range notwithstanding their differences due to manufacturing tolerances and variations in magnetic characteristics comprising a casing on each of said hysteresis brakes, internal alternating first slots and first teeth on each of said casings, a pole on each of said hysteresis brakes, external alternating second slots and second teeth on each of said poles, said first slots and teeth of each of said casings being spaced radially outwardly from said second slots and teeth of its respective pole, a rotor on each of said hysteresis brakes including an annular portion spaced between said first and second slots and teeth on each of said hysteresis brakes, and locking means for locking each of said poles in a circumferentially adjusted position relative to its respective casing to cause said first and second slots and teeth of each of said hysteresis brakes to be in different adjusted positions to produce in each of said hysteresis brakes a torque of a substantially predetermined value at a calibrating current and thus produce torque curves within said plurality of hysteresis brakes which fall within a range which is much closer than the range which is obtainable by orienting the pole and casing of each of said hysteresis brakes in the same relative orientation to thereby cause each of said hysteresis brakes to produce substantially the same torque output at substantially the same operating current within its operating range notwithstanding said differences due to manufacturing tolerances and magnetic characteristics.