Methods of manufacturing rotors having interfering sintered magnets and carbon filament sheaths for electric motors

摘要

A method of manufacturing an electric-motor rotor may include providing a magnet of sintered magnetic material, the magnet having a first diameter; providing a sheath of composite material, the sheath having an inner diameter smaller than the first diameter; reducing the first diameter to a second diameter; fitting the sheath onto the magnet when the magnet has the second diameter; and letting the magnet with the sheath fitted thereon to interfere, allowing the sheath to exert inward pressure on the magnet. An electric-motor rotor may include a magnet of sintered magnetic material, the magnet having a first diameter; and a sheath of composite material, the sheath having an inner diameter smaller than the first diameter. The sheath may be associated with the magnet in such a way that the magnet with the sheath fitted thereon interfere so that the sheath exerts inward pressure on the magnet.

主权项

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.