Method for making rotor for permanent magnet electric machine
AssigneeThe Bergquist Torrington Company
InventorsBumsuk Won, Russel H. Marvin, Gary Peresada
Life of this patent
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Abstract
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.
Claims11
A method for making a rotor for a permanent magnet electric machine comprising the steps of providing a permanent magnet in an annular configuration and in an un-magnetized condition, providing an annular back-up member for the permanent magnet adapted to receive the magnet on its inner surface and to serve with the magnet affixed thereto as a rotor in an electric machine, affixing the permanent magnet to the back-up member in the desired position, over-molding the assembled magnet and back-up member in an injection molding operation so that the magnet and back-up member are substantially completely embedded in the plastic with the inner side and at least one end of the magnet completely covered by plastic, and magnetizing the permanent magnet in one or more sections.
Dependencies are inferred from the claim text.