Integrated electric motor and drive system with auxiliary cooling motor and asymmetric heat sink

A drive integrated type motor system comprising:

• a substantially cylindrical electric motor including a rotor,
• a fan connected to said rotor of the electric motor and generating an air flow;
• a motor drive;
• a heat sink having a first side adapted to mount to said motor drive and a second side including a first pair of cooling fins adapted to engage an outer surface of said substantially cylindrical electric motor and a plurality of asymmetrically spaced apart heat transfer fins disposed on said second side of the heat sink between said first pair of cooling fins for transferring heat generated by said motor drive to said air flow;
• a fan shroud connected to one end of the motor to direct all of said air flow from said fan toward said plurality of asymmetrically spaced apart heat transfer fins, the fan shroud including a first baffle for dividing said air flow from said fan into a plurality of component air flows, a first component air flow among said plurality of component air flows being directed toward a first group of said asymmetrically spaced apart heat transfer fins and a second component air flows among said plurality of component air flows being directed toward a second group of said asymmetrically spaced apart heat transfer fins.