An electric motor system comprising: an electric motor; an electric motor enclosure for the electric motor, the electric motor enclosure being selected from a Weather Protected type II enclosure, a Totally Enclosed Air-Air Cooled enclosure, and a Totally Enclosed Water to Air-Cooled enclosure, said Weather Protected type II enclosure comprising an enclosure with ventilating passages constructed to resist entrance of rain, snow, and/or air-borne particles; an electric motor cooling fan for cooling the electric motor, the electric motor cooling fan being coupled to the electric motor enclosure via a releasable mounting flange, the electric motor cooling fan being adapted to circulate cooling air within said electric motor enclosure such that the cooling air directly contacts at least a portion of a rotor and a portion of a stator of said electric motor, the electric motor cooling fan comprising a fan shaft that defines a longitudinal axis that is non-collinear with a longitudinal axis of a shaft of said rotor of said electric motor; and an auxiliary motor for driving said fan shaft, the auxiliary motor being distinct from the electric motor, wherein said electric motor enclosure is configured in a Z ventilation pattern comprising a set of baffles adapted to channel cooling air from said electric motor cooling fan to enter said rotor of said electric motor at a first end of said rotor, said set of baffles of said Z ventilation pattern being adapted to channel said cooling air, via a plurality of openings defined by a circumferential face of said rotor, to exit said rotor via a second end of said rotor, in said Z ventilation pattern said cooling air being channeled from said second end of said rotor to said electric motor cooling fan. an electric motor; an electric motor enclosure for the electric motor, the electric motor enclosure being selected from a Weather Protected type II enclosure, a Totally Enclosed Air-Air Cooled enclosure, and a Totally Enclosed Water to Air-Cooled enclosure, said Weather Protected type II enclosure comprising an enclosure with ventilating passages constructed to resist entrance of rain, snow, and/or air-borne particles; an electric motor cooling fan for cooling the electric motor, the electric motor cooling fan being coupled to the electric motor enclosure via a releasable mounting flange, the electric motor cooling fan being adapted to circulate cooling air within said electric motor enclosure such that the cooling air directly contacts at least a portion of a rotor and a portion of a stator of said electric motor, the electric motor cooling fan comprising a fan shaft that defines a longitudinal axis that is non-collinear with a longitudinal axis of a shaft of said rotor of said electric motor; and an auxiliary motor for driving said fan shaft, the auxiliary motor being distinct from the electric motor, wherein said electric motor enclosure is configured in a Z ventilation pattern comprising a set of baffles adapted to channel cooling air from said electric motor cooling fan to enter said rotor of said electric motor at a first end of said rotor, said set of baffles of said Z ventilation pattern being adapted to channel said cooling air, via a plurality of openings defined by a circumferential face of said rotor, to exit said rotor via a second end of said rotor, in said Z ventilation pattern said cooling air being channeled from said second end of said rotor to said electric motor cooling fan.