Abstract: An improved permanent magnet DC motor designed to accurately support inner pole pieces between end bells to obviate the need for grinding the bore of the stator assembly, magnets and outer magnet pieces being sequentially attached to the inner poles, and the outer magnetic non-structural pieces being configured for most efficient use of a minimum weight of permeable material.

Abstract: A momentum wheel wherein friction has been substantially eliminated by replacing mechanical bearings with a magnetic suspension. The rotor of the momentum wheel, in the form of a circular disk whose diameter greatly exceeds its thickness, is maintained in suspension, free of physical contact with the housing, by means of magnetic fields applied between the circular flat surfaces of the rotor disk and a pair of stator plates. The rotor is passively restrained in the radial direction by means of permanent magnets, while an active axial restraint is provided by a combination of permanent magnets and electromagnetic windings.