Permanent magnet rotor with interfit cage structure

Claim 2

A permanent magnet rotor assembly comprising a magnet cage having a washer-like segment with a plurality of equally spaced legs extending from the outer peripheral portions of one face thereof, with each of said legs being shaped such that the opening between adjacent legs at the outer surface thereof is narrower than the opening between the legs at an intermediate height thereof, a sleeve mounted in the center of the plurality of legs against said washer-like segment, a shaft press fitted through said sleeve and said cylindrical extension, a plurality of wedge-shaped magnets mounted around said sleeve, with each magnet confined between adjacent legs and retained thereby against said sleeve within said narrower outer opening, and a cover plate having a plurality of central and radial openings formed therein, said shaft and the end portions of said legs beyond said magnets extending through the respective central and radial openings, the end portions of said legs being deformed in said radial openings to secure the rotor assembly.

Claim 3

A rotor assembly comprising a magnet cage having a central washer-like segment with a cylindrical extension formed on one face thereof and a plurality of equally spaced legs extending from the outer peripheral portions of the other face thereof, with each of said legs having concentric inner and outer surfaces and a substantially rivet-shaped cross-section with the head thereof being tapered inwardly from the outer surface thereof, a sleeve mounted in the center of the plurality of legs against said washer-like segment, a shaft press-fitted through said sleeve and said cylindrical extension, a plurality of wedge-shaped magnets mounted around said sleeve, with each magnet confined between adjacent legs and retained therebetween and against said sleeve by said tapered head of said rivet-shaped cross-section of said adjacent legs, and a cover plate having a central opening and a plurality of equally spaced radial slots formed therein, with said radial slots being chamfered on one side thereof, said cover plate being mounted around said shaft and onto the end portions of said legs beyond said magnets such that said end portions extend through the respective radial slots and are deformed into the chamfered portions thereof to secure the rotor assembly.

Claim 4

A rotor assembly comprising a magnet cage having a central washer-like segment with a cylindrical extension formed on one face thereof and a plurality of equally spaced legs extending from the outer peripheral portions of the other face thereof, with each of said legs having concentric inner and outer surfaces and a substantially rivet-shaped cross-section with the head thereof being tapered inwardly from the outer surface thereof, a sleeve mounted in the center of the plurality of legs against said washer-like segment, a shaft press-fitted through said sleeve and said cylindrical extension, a plurality of wedge-shaped magnets mounted around said sleeve, with each magnet confined between adjacent legs and retained therebetween and against said sleeve by said tapered head of said rivet-shaped cross-section of said adjacent legs, and a cover plate having a central opening and a plurality of equally spaced radial slots formed therein, with said radial slots being chamfered on one side thereof, said cover plate being mounted around said shaft and onto the end portions of said legs beyond said magnets such that said end portions extend through the respective radial slots and are deformed into the chamfered portions thereof to secure the rotor assembly.