Abstract: A stator arrangement for a balanced multiple voltage device operable as an electric motor, a generator, or a motor-generator includes a plurality of arc sectors configured so as to surround a rotor of the device. Each of the arc sectors includes a set of stator windings with at least one winding in each set. Those windings in pairs of the arc sectors located at diametrically opposed locations of the stator arrangement are concurrently energized and deenergized in order to eliminate load imbalance on the device.

Abstract: A rotor arrangement with decreased fluid flow impedance and improved rotary motor cooling is mountable on a shaft for rotation relative to the stator of a rotary motor arrangement The rotor arrangement has a plurality of laminations joined together to form a multilayer laminated rotor with a plurality of magnet receptacles. Each of the laminations has a solid central section surrounding an opening within which the shaft is receivable, spokes extending substantially radially outwardly from said solid central section, ribs interposed between adjacent spokes, and bridges interconnecting the spokes and ribs. At least some of the bridges are inset from an outer diameter of the lamination toward the solid central section to decrease fluid flow impedance and improve rotary motor cooling.