Patent ID: 6208050
Filing Date: 2001-03-27
Classification: F16C,G11B,H02K

Abstract:
An electric motor, comprising:at least one support;a shaft defining an axis and rotatably mounted on the at least one support;a radially-extending rotor coupled to the shaft and rotatable therewith;a ball bearing assembly including an inner race, an outer race, and at least one ball bearing located between the inner race and outer race, and coupled between the shaft and the at least one support for rotating the shaft and rotor relative to the support; andat least one preload magnet fixedly coupled to the at least one support, axially spaced adjacent to the rotor, and extending along an approximate arc, to thereby magnetically attract the rotor in approximately the axial direction of the shaft and, in turn, apply a preload to the ball bearing assembly.