Abstract: A electric motor has a stator and a rotor. The stator comprises a housing and a plurality of magnets fixed to an inner surface of said housing by a frame member. The magnets are embedded in the frame member. A plurality of first grooves are formed in an outside peripheral surface of the frame member, each of said first grooves extending axially from one axial surface of said frame member and having a axial length smaller than the axial height of said frame member. The housing has a plurality of first anchors formed on its inner surface, each of the first anchors engaging with a corresponding one of the first grooves.

Abstract: An engine cooling system, comprising a fan unit, cooling pipes and a coolant tank, the coolant tank, the cooling pipes and cooling channels of the engine being connected together and forming a cooling cycle, the fan unit being used to cool the cooling pipes and the coolant therein; wherein the fan unit comprises a motor and fan blades driven by the motor, the motor comprising a stator and a rotor rotatable mounted confronting the stator; the rotor comprising a shaft, a commutator fitted to the shaft, a rotor core fitted to the shaft adjacent to the commutator, windings wound about teeth of the rotor core and electrically connected to segments of the commutator; the windings being wound by aluminium cored wire that has a electrical insulation film around its peripheral surface.

Abstract: A commutator 10 for an electric motor comprises a plurality of commutator segments supported by a base. The segments have an electrically conductive body portion 14 and at least one electrically conductive foldable tang 16 provided on the body portion 14 for engaging a winding lead wire 44 of an electric motor. The foldable tang 16 has a proximal end 18 on or adjacent to the body portion 14, and a distal end 22 remote from the proximal end 18. A wire-accommodating portion 30 is provided on or adjacent to the foldable tang 16, so that, when the tang 16 is folded, the wire-accommodating portion provides a predetermined gap 56 for the winding lead wire 44.