Patent attributes
The present invention provides a rotor of a brushless (BL) motor, including: a high-strength engineering plastic member formed by injection-molding high-strength engineering plastic around a concavo-convex portion 12a formed on the outer circumferential surface of a rotary shaft; a sound-absorbing resin element formed by injection-molding a sound-absorbing resin around the high-strength engineering plastic member; a cylindrical ring magnet assembly including a plurality of axially aligned ring-shaped magnets, each of which has a plurality of indented grooves 20a and 20b formed on both end edges of the inner circumferential surface thereof; and a high-strength plastic member formed by injection-molding a high-strength plastic between the sound-absorbing resin element and the ring magnet assembly, the high-strength plastic member having a plurality of protrusions formed on the outer circumferential surface thereof in such a fashion that each protrusion corresponds to an associated one of the indented grooves of the ring-shaped magnets.
