"Micro Cooling Fan" Further, the circuit board is mounted on the bottom of the motor base, and the circuit board comprises epoxy circuit boards, electronic components and power cord is plugged outer lead composition, the external power cord extends lead outside the motor housing, said electronic component comprising a Hall element controlling the COM; Furthermore, the assembly line at the bottom of the jacket and the stator core is connected to the upper end of the circuit board, the ferrule in the stator core above the core and socket electrical seat center column of oil-bearing pad between the motor base and the top of the center column on the clamp is connected with 0-ring; further, the outer lead power cord is fixed on the circuit pins or wire connector on the board.