Patent ID: 6552459
Filing Date: 2003-04-22
Classification: H02K

Abstract:
A rotor assembly comprising:a rotor core having a center axis of rotation and a cylindrical exterior surface with an axial length; a support protrusion projecting radially outwardly from the core exterior surface; at least one magnet positioned on the support protrusion and being supported in a radially outward spaced relation from the core exterior surface by the support protrusion thereby defining a radial spacing between the core exterior surface and the at least one magnet; a connection in the radial spacing that holds the magnet to the core exterior surface; the at least one magnet has an axial length and a transverse width with end portions at opposite ends of the magnet width and a mid portion of the magnet between the end portions; the support protrusion is a primary support protrusion; a plurality of secondary support protrusions project radially outwardly from the rotor core exterior surface, the plurality of secondary support protrusions support the end portions of the at least one magnet in a radially outward spaced relation from the exterior surface; and, the primary support protrusion is positioned between two adjacent secondary support protrusions and supports the mid portion of the at least one magnet in a radially outward spaced relation from the core exterior surface.