Patent ID: 6232691
Filing Date: 2001-05-15
Classification: H02K,H02P

Abstract:
A DC electric starter comprising:(i) a rotor assembly with a rotor core having a cross-sectional silhouette formed by a hub with F equally spaced apart appendages extending radially from said hub, each of said appendages comprising an arm attached to said hub and having an outer end and a flanged formation at said outer end of said arm, said flanged formation having a width contained within a sector defined by a first pair of straight lines extending from the center of the rotor assembly to each edge of said flanged formation, the angle formed by said first pair of straight lines defining a first angle between them, said first angle being between 30.degree..times.(4/F) and 40.degree..times.(4/F) wherein F is the number of rotor poles and the value of F is one of four and six; and(ii) a generally hollow cylindrically shaped stator assembly encircling said rotor assembly, said stator assembly having an inner surface and including a plurality of stator slots extending substantially lengthwise along said inner surface, each of said slots having at least two main stator phase winding segments located therein, said two main stator phase winding segments in each stator slot being oppositely wound:wherein, said stator assembly has a forward direction of rotation, and there are twelve main stator phase winding segments and 6.times.F stator slots, said twelve main phase winding segments being identifiable as main phase winding segments one through twelve, each of said main phase winding segments one through six being routed through six consecutive stator slots and in the same direction within said stator slots, each of said main phase winding segments one through six being further routed through every sixth stator slot at substantially 360.degree./F intervals from a corresponding one of said six adjacent stator slots, for a plurality of turns, each turn covering 360.degree. in said forward direction, each of said main phase winding segments seven through twelve being routed through said six consecutive stator slots but in a direction within said stator slots opposite from main phase winding segments one through six, each of said main phase winding segments seven through twelve being further routed through every sixth stator slot at substantially 360.degree./F intervals from the corresponding one of said six consecutive stator slots, for said plurality of turns, each turn covering 360.degree. in said forward direction, so as to form said two oppositely wound main phase winding segments in every stator slot.