Patent ID: 6528907
Filing Date: 2003-03-04
Classification: F25B,F28D,H01L,H02K

Abstract:
A linear motor comprising:a stator having a longitudinally extended back plate and a plurality of coil units disposed on said back plate in longitudinally spaced relationship; a moving element spaced above said stator, said moving element including a plurality of field magnets disposed in longitudinally spaced relationship; and, a plurality of heat pipes coupled to said back plate in close proximity to said plurality of coil units for removing heat generated by said plurality of coil units, each of said plurality of heat pipes having a predetermined diameter (Dp) and a plurality of heat dissipating fins coupled thereto for increasing a heat dissipation area of said heat pipe, each of said heat dissipating fins having a diameter (Df) defined by the equation: Df=2(Egen/Nef2&pgr;h(Tâˆ’Ta)âˆ’1 (L+(pâˆ’t)(Nâˆ’1))r1/Nef+r12âˆ’t/2) â€ƒwhere: Egen=heat quantity from heat source, h=heat transfer coefficient, r1=Â½ diameter (radius) of the heat pipe, ef=efficiency of the heat dissipating fin, N=number of heat dissipating fins, Ta=ambient temperature, T=heat source temperature, L=distance between heat source and a first of said plurality of heat dissipating fins, p=distance between heat dissipating fins, and t=thickness of heat dissipating fin.