Patent ID: 9641030
Date: 2017-05-02
CPC Classifications: H02K,Y10T

Claim:
1. A method of manufacturing a rotor for an electric motor, the method comprising: providing a magnet of sintered magnetic material, the magnet having a first diameter; forming a radial holding sheath of composite material, the forming including winding at least one carbon filament around a chuck to form a wound carbon filament arrangement that is fixed in position by a layer of resin and has an inner diameter that is smaller than the first diameter; reducing the first diameter of the magnet to a second diameter; fitting the sheath onto the magnet concurrently with the magnet having the second diameter and the sheath being at room temperature; and letting the magnet with the sheath fitted thereon to interfere, thus allowing the sheath to exert inward pressure on the magnet.