Patent ID: 6762521
Filing Date: 2004-07-13
Classification: F04D,H02K,H05K

Abstract:
A drive unit for a fan in a vehicle, said drive unit comprising a brushless DC electric motor with a rotor and a stator, an electronic actuation system, and a housing molded of plastics,said electronic actuation system being surrounded by said housing, said housing supporting said electric motor, said housing having air inlet openings for cooling of electronic components of said electronic actuation system and for cooling components of said electric motor, said rotor being generally pot-shaped and having air outlet openings on an end face of said rotor remote from said air inlet openings of said housing, said housing having a bearing sleeve integrally molded with said housing, said rotor of said electric motor being mounted on said bearing sleeve, said bearing sleeve having a guide channel for directing cooling air that enters said housing through said air inlet openings of said housing toward said outlet openings of said rotor, said electronic actuation system having a power part and a control part, said power part and said control part being mounted on separate circuit boards, said air inlet openings of said housing being provided next to power semiconductors of said power part.