Abstract: A permanent magnet motor having a stator back iron in the form of a “slinky” and a plurality of winding sections in circumaxially spaced relationship about the back iron. Each winding section comprises a conductor wound helically about the back iron with each coil adjacent the next and ending in a radial plan. A permanent magnet motor surrounds the stator.

Abstract: A zero clearance bearing assembly comprising a housing defining a generally cylindrical bearing chamber with a pair of ball bearing units disposed therein. One unit is adjacent an axial thrust reaction surface of frusto-conical configuration and a shoulder on an associated shaft urges the unit into engagement with the surface. The other unit is press fit on the shaft and also has a shaft shoulder urging it toward the thrust surface. An air impeller on the shaft urges the same toward the other bearing unit and the thrust unit reacts to both the impeller load and an axial preload spring engaging the other bearing unit. One or both of the bearing units is provided with an improved radial preload device comprising a spring and a pair of circumaxially spaced reaction surfaces opposing the same.

Abstract: A permanent magnet motor having a stator back iron in the form of a “slinky” and a plurality of winding sections in circumaxially spaced relationship about the back rion. Each winding section comprises a conductor wound helically about the back iron with each coil adjacent the next and ending in a radial plane. A permanent magnet motor surrounds the stator.