Motor controller and fan system comprising the same

A fan system, comprising:

• a) a volute, the volute comprising an inner cavity, an air inlet, and a first air outlet;
• b) a wind wheel;
• c) a motor, the motor comprising a rotating shaft;
• and
• d) a motor controller, the motor controller comprising a control box;
• the control box comprising a plurality of fins;
• wherein:
• the inner cavity is disposed within the volute;
• the wind wheel is disposed within the inner cavity;
• the air inlet and the first air outlet are disposed on a sidewall of the volute;
• the motor is disposed outside the volute;
• the rotating shaft extends into the inner cavity and is connected to the wind wheel;
• the motor controller is disposed nearby the motor;
• the motor controller is in electric connection with the motor and controls the operation of the motor;
• the plurality of fins is adapted to dissipate heat of the motor controller;
• and
• the wind wheel is adapted to suck ambient air to form an air flow wherein the air flow passes through the plurality of fins.