HEAT RADIATING STRUCTURE FOR SMALL CYLINDRICAL CORELESS MOTOR

摘要

PROBLEM TO BE SOLVED: To attain a small coreless motor unit which has an external diameter <=ϕ30 mm and measures against heat generation so that it can stand such a harsh operation as to constantly repeat normal or reverse rotation, in a small coreless motor used in a harsh operating/driving part for a radio-controlled model or the like. SOLUTION: This coreless motor includes a cup rotor in which the other end of the axial opening of a cylindrical winding coil is fixed to a rotating shaft. Part of the winding coil of the rotor or the entire surface layer thereof is placed with a metal layer of high heat conductivity for heat radiation formed of copper or nickel alloy using a surface processing method selected from a vacuum deposition processing and a wet deposition processing.