Patent ID: 6940206
Filing Date: 2005-09-06
Classification: H02K

Abstract:
1. A coreless motor comprising: a ring-shaped coil yoke fitted to the interior of a casing, which has a conductive coil connected to a ring-shaped magnet, hose external circumference face opposes the internal circumference face of the coil yoke, and the coil designed to revolve jointly with the rotating axis following power input to the said coil; wherein the said coil confronts the upper and lower faces of the magnet and consists of a flat portion whose plane part takes an arc form and of a curved-and-folded portion composed of a winding unit confronting the external circumference side face of the magnet, while the section from one end of the lead wire composing these winding units to its other end constitutes a continuous hollow unit; wherein a thin-sheet-shaped flange is installed on the lower part of the coil holder fixed to the periphery of the said rotating axis and a plurality of said coils are attached so as to be arranged in line with the circumference direction of the magnet by fixing the flat portion on the lower side of each coil to the flange; and wherein thin annulus-shaped upper-side reinforcing plates are attached to the flat portion on the upper side of each coil.