Patent ID: 7059830

Claim:
An axial-flow serial fan, comprising: a frame having a support connected to and disposed inside the frame; a first rotor vane having at least one first blade; a second rotor vane having at least one second blade; a first motor for driving the first rotor vane; and a second motor for driving the second rotor vane, wherein the first rotor vane and the second rotor vane are provided in series in the frame along an axial direction and at least one of said first and second motors is disposed within a hub of one of said first and second rotor vanes, and the first and second motors are received by the support to minimize space occupied by the axial-flow serial fan in the axial direction; and rotational speeds and directions of the first rotor vane and the second rotor vane are controllable by the first motor and the second motor, respectively.