Patent ID: 9246364
Filing Date: 2016-01-26
CPC Classification: H02K,Y10T

Claim Text:
1. A permanent magnet rotor comprising: at least one permanent magnet; a substantially cylindrical rotor core comprising an outer edge and an inner edge defining a central opening, said rotor core having a radius R, said rotor core further comprising at least one pole and at least one radial apertur extending radially through said rotor core from said outer edge to a predetermined depth less than said radius, said at least one radial aperture configured to receive said at least one permanent magnet; and at least one protrusion extending into said at least one radial aperture, said at least one protrusion positioned substantially along a bottom of said at least one radial aperture and configured to facilitate retention of said at least one permanent magnet within said at least one radial aperture; and wherein said predetermined depth of said at least one radial aperture is a depth between a minimum depth defined by the equation  and a maximum depth defined by the equation  wherein n is the number of poles of the rotor core and t is the thickness of said at least one permanent magnet.