BRUSHLESS DC MOTORIZATION APPARATUS
A direct-drive brushless DC motorization apparatus comprises an outer rotor with poles constructed with segments of permanent magnet material alternatively magnetized north and south. The outer rotor is adapted to be part of a wheel and rotating with the wheel about an axis thereof. A stator core of ferromagnetic material is spaced inwardly of said rotor to define a clearance gap with the rotor such that the rotor is rotatable about the stator core. The stator core has forty-two slots and defines teeth therebetween. A three-phase winding with coils of insulated wire is wound around the teeth of the stator core. The three-phase winding is divided in two sets of consecutive teeth for each of the three phases, with each of the two sets of a same phase being diametrically opposed in the stator core.
1 . A direct-drive brushless DC motorization apparatus comprising:
an outer rotor with poles constructed with segments of permanent magnet material alternatively magnetized north and south, the outer rotor adapted to be part of a wheel and rotating with the wheel about an axis thereof;
a stator core of ferromagnetic material spaced inwardly of said rotor and defining a clearance gap with the rotor such that the rotor is rotatable about the stator core, said stator core having forty-two slots and defining teeth between said slots; and
a three-phase winding with coils of insulated wire being wound around the teeth of the stator core, the three-phase winding being divided in two sets of consecutive teeth for each of the three phases, with each of the two sets of a same phase being diametrically opposed in the stator core.
2 . The brushless DC motorization apparatus according to claim 1 , wherein the three-phase winding are divided into two sets of seven consecutive teeth for each of the three phases.
3 . The brushless DC motorization apparatus according to claim 1 , wherein each said phase of the three-phase winding is divided into sets of six and eight consecutive teeth.
4 . The brushless DC motorization apparatus according to any one of claims 1 to 3 , wherein the outer rotor comprises forty poles.
5 . The brushless DC motorization apparatus according to any one of claims 1 to 3 , wherein the outer rotor comprises forty-four poles.
6 . The brushless DC motorization apparatus according to claim 1 , wherein the stator core has a hub supporting a stator yoke, wherein the hub comprises structural elements extending diametrically between centers of each said set of the same phase.
7 . The brushless DC motorization apparatus according to claim 6 , wherein the hub has a six-pointed star shape, with an interconnection between points of the star shape and the stator yoke being in alignment with a center of each said set of teeth.
8 . The brushless DC motorization apparatus according to claim 7 , wherein each said set comprises seven consecutive teeth.
9 . The brushless DC motorization apparatus according to any one of claims 1 to 8 , wherein the stator is fixed to an axle of the wheel.
10 . The brushless DC motorization apparatus according to any one of claims 1 to 9 , wherein the rotor is adapted to be operatively connected to a freewheel of a vehicle to rotate therewith in one rotational orientation.
11 . The brushless DC motorization apparatus according to any one of claims 1 to 10 , wherein the rotor is adapted to be connected to spokes of a wheel, with the spokes projecting radially from a casing of the rotor.
12 . The brushless DC motorization apparatus according to any one of claims 1 to 11 , wherein each said phase comprises 14 teeth.