Patent ID: 6838799

Claim:
A DC motor apparatus, comprising: a motor housing assembly which includes an outer chamber portion and an inner, armature-reception chamber portion, at least one pair of stator magnet modules housed within said outer chamber portion, at least one pair of shunt members housed within said outer chamber portion between said stator magnet modules, an armature housed in said inner, armature-reception chamber portion, wherein said armature is centrally located with respect to said stator magnet modules, such that said stator magnet modules are arrayed peripherally around said armature, wherein said armature includes at least one pair of armature pole portions, wherein both of said at least one pair of armature pole portions are wound with same-directional windings, a commutator connected to said armature, wherein said commutator includes at least one pair of commutator contacts, wherein the number of pairs of commutator contacts is equal to the number pairs of said armature pole portions, and a brush advance/retard mechanism supported by said motor housing assembly, wherein said brush advance/retard mechanism includes roller brushes for contacting said commutator contacts.