Patent ID: 7241118

Claim:
A pump adapted to circulate a coolant between a radiator and a water tray positionable on a heat generating device of a computer system for removing heat from the heat generating device, the pump comprising: a casing forming a lower chamber and an upper chamber, an outlet formed in a side wall of the upper chamber for discharging the coolant; a lid closed an upper opening of the upper chamber and forming an inlet adapted to receive the coolant; a blade assembly comprised of a plurality of blade received in the upper chamber and rotatable about a shaft and a first permanent magnet coaxially attached to the blades; and a second electrical magnet accommodated in the lower chamber and surrounding the first magnet, whereby a magnetic force is induced between the first and second magnets to drive rotation of the blade assembly about the shaft; wherein the first magnet is comprised of an upper section and a lower section, each comprised of a semi-circular north pole portion and a semi-circular south pole portion, the upper and lower sections being stacked in a non-symmetric alternating manner with respect to each other.