FLUID DYNAMIC BEARING MOTOR WITH SINGLE BEARING AND MAGNETIC BIASING OF THE BEARING

摘要

A single thrust beraing fluid dynamic bearing (FDB) design, including a typical dynamic bearing design which comprises a ring-shaped or circular thrust plate mounted at or near the end of a shaft, wherein the shaft defines together with the surrounding sleeve a journal bearing by providing grooves on one of the two surfaces facing the gap between the shaft and the sleeve. On the thrust plate, only one of the two surfaces is grooved to establish an active thrust beraing. The rotor is then biased against the single active thrust bearing with a constant force generated by a magnetic circuit.