Abstract: A stator for use with a permanent magnet rotor electrical machine is disclosed which stator eliminates ferromagnetic teeth previously used in stator cores. The stator of the present invention uses a winding support structure made of non-magnetizable, non-conductive material to support the stator windings, which may advantageously be prewound prior to installation on the winding support structure. The stator is easily adaptable to liquid cooling, and has substantially reduced losses due to its toothless design.

Abstract: A two pole permanent magnet rotor utilizes a single cylindrical two pole permanet magnet mounted between two end pieces and surrounded by a retaining hoop. The cylindrical two pole permanent magnet, which is made of high energy product material, is "straight through" diametrically magnetized to provide a sinusoidal air gap flux distribution which eliminates losses due to harmonics. The cylindrical two pole permanent magnet may be made of a plurality of smaller magnet blocks which are stacked and machined to form a cylindrical configuration.

Abstract: A permanent magnet rotor construction technique resulting in a rotor having excellent stiffness characteristics and being capable of higher speeds and longer lengths is disclosed. The rotor is constructed using nonfusion bonding techniques whereby an inner cylinder of magnetizable material is bonded inside a hollow outer cylinder of non-magnetizable material, with the resulting assembly having cylindrical end pieces also of non-magnetizable material bonded at each end. Pockets for receiving the rare earth permanent magents are then machined through the outer cylinder, and the magnets are mounted in the pockets in contact with the magnetizable material of the inner cylinder. Construction of the rotor is completed by installing a thin cylindrical shell over the permanent magnets in the areas of the rotor adjacent thereto.