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US 4,358,696 AGranted
Permanent magnet synchronous motor rotor
AssigneeSiemens-Allis, Inc.
InventorsJoseph C. Liu, Paul D. Wagner, John J. Keuper
Life of this patent
Estimating the term…
Abstract
A permanent magnet rotor configuration which produces four magnetic poles utilizing two sets of symmetrically-disposed permanent magnets. The slots carrying the magnets exhibit a truncated V-shaped configuration, extending from points on the periphery of the rotor to meet the ends of a straight, central portion which lies parallel to a tangent to the rotor shaft. A short magnetic bridge interrupts the center of each slot, the slots being disposed generally symmetrically upon opposite sides of the rotor shaft.
Claims6
A four-pole rotor for a permanent magnet synchronous motor comprising:
- a plurality of magnetic laminations aligned to form a rotor body, said laminations having openings which align to define
- (i) a set of rotor bar slots disposed in an arc about the periphery of the rotor body;
- (ii) a central opening extending axially through said rotor body to define a shaft opening;
- and
- (iii) first and second sets of elongae slots disposed symmetrically upon opposite sides of said rotor shaft opening, each elongate slot having a central portion extending parallel to a line tangent to said shaft opening and end portions extending generally along radii of the rotor body and interleaved generally aligned with said rotor bar slots;
- said central portions of said elongate slots lying parallel to one another and being interrupted by a magnetic bridge extending substantially in the center thereof, each of said bridges being integrally formed with said laminations;
- and
- a plurality of rare earth permanent magnets disposed in said central and end portions of said elongate slots.
5 more elements
Dependencies are inferred from the claim text.