Abstract: This invention is directed to a magnet-retaining structure for a motor, which comprises a cylindrical casing, two semicircular magnets inserted in the cylinderical casing, a resilient retainer whose resilient force fixes the semicircular magnets to the inner surface of the casing, and a coupler provided with brushes. Owing to the construction, the magnet-retaining structure permits simplification of the manufacture of component parts of the motor, facilitates the work of final assembly of the motor, and prevents the resilient retainer from dislocation and the magnets from displacement in the axial direction.

Abstract: A method for the manufacture of an annular magnet, which comprises depositing, on the opposite sides of an annular material of magnetic substance, magnetizing members regularly spaced circumferentially in conformity with the shape of said annular material and opposed perpendicularly to each other across said annular material and forming magnetic fluxes through paired magnetizing members in alternately opposite directions thereby magnetizing said interposed annular material.