Apparatus for reducing spindle motor magnetic drag

摘要

A motor comprises a shaft supported from a base frame and supporting a hub and one or more on the outer diameter thereof. A stator is supported from the shaft, and comprises a plurality of laminations supporting coils which are sequentially energized to cause rotation of a hub which overlies the stator and supports a magnet and back iron radially adjacent these stator coils. A shield is provided extending substantially the entire width of the magnet and intervening between the magnet and the base frame and rotating with the magnet. The flux shield is formed of a magnetic material to capture any stray magnetic flux from the motor magnet.