Patent attributes
A high speed brushless axial gap air core electrical machine includes a rotor mounted for rotation about an axis, and a stationary stator that magnetically interacts with the rotor. The rotor has two discs that are axially spaced apart to form an armature airgap. A stationary air core armature, with windings made of multiple individually insulated strand conductor wire for providing energy conversion, is located in the armature airgap. At least one of the discs carries a circumferential array of multiple alternating axial polarity permanent magnet poles facing the armature airgap. The magnets drive magnetic flux circumferentially through ferromagnetic portions of the discs and axially through the armature airgap. The discs have an integral axially extending circumferentially continuous lip outside of the array of magnet poles. The lip has a integral shear connection with the disc that substantially reduces the hoop stress in the lip that would otherwise occur from the radial containment of the magnet poles when rotated to high speed.
