Patent ID: 6888280

Claim:
A brushless DC motor/generator ( 10 ) comprising; a cylindrical outer rotor ( 19 ) with twenty two magnetically coupled poles ( 20 ) constructed with segments of permanent magnet material alternatively magnetized north and south, a stator having a core ( 8 ) of ferromagnetic material spaced inwardly of said rotor and defining a magnetic clearance gap ( 9 ) therebetween, said stator core having twenty-four slots ( 18 ) and defining teeth ( 23 ) between said slots ( 18 ), a three phase winding with coils ( 7 ) of insulated wire being wound around the teeth, there being mutual inductance between the phases of said stator, an electronic supply ( 11 ) including a power electronics system and a current control circuit means ( 14 ) to control the torque of said motor ( 10 ) and therefore its arresting force for braking a wheel ( 53 ) of devices on which people are displaced by said DC motor motorizing said wheel, further comprising an additional two coils ( 7 ) per slot ( 18 ) with predetermined connection patterns: C, Câ€², C, Câ€², Bâ€², B, Bâ€², Aâ€², A, Aâ€², A, Aâ€², Câ€², C, Câ€², Bâ€², B, Bâ€², B, Bâ€², Aâ€², A, Aâ€², Câ€², resulting in reduced torque ripple without any slot or magnet skewing, and wherein the magnetic path of flux produced by each phase current is not independent.