US Patent:
20030218400, Nov 27, 2003
Inventors:
Dennis Rimmel - Cypress CA, US
International Classification:
H02K017/00
Abstract:
A motor having a rotor with a plurality of grooves extending generally longitudinally along an outer surface of the rotor. A cross-sectional shape of the rotor outer surface generally corresponds to the shape of an outer boundary of a flux pattern that is developed in the rotor during operation. A plurality of slots extend longitudinally along the same general direction as the grooves and are positioned in a spaced relationship to the outer surface of the rotor and the grooves. The grooves and/or slots extend in a skewed or generally helical direction along the length of the rotor to enhance pumping action.