Method for making rotor for permanent magnet electric machine

摘要

A method for making a rotor for a permanent magnet electric motor comprising the steps of providing an annular permanent magnet and an annular back-up member. Affixing the magnet to the inner surface of the back-up member in an un-magnetized condition and overmolding both in an injection molding process while controlling the flow of the molten plastic so as to cause the plastic to engage the opposite sides of the magnet at substantially the same time resulting in a knit line intermediate the magnet sides on the inner surface of the magnet. Magnetizing the magnet.