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Title: Rotor for a line start permanent magnet machine

A rotor comprises laminations with a plurality of rotor bar slots with an asymmetric arrangement about the rotor. The laminations also have magnet slots equiangularly spaced about the rotor. The magnet slots extend near to the rotor outer diameter and have permanent magnets disposed in the magnet slots creating magnetic poles. The magnet slots may be formed longer than the permanent magnets disposed in the magnets slots and define one or more magnet slot apertures. The permanent magnets define a number of poles and a pole pitch. The rotor bar slots are spaced from adjacent magnet slots by a distance that is at least 4% of the pole pitch. Conductive material is disposed in the rotor bar slots, and in some embodiments, may be disposed in the magnet slot apertures.
Inventors:
; ;
Issue Date:
OSTI Identifier:
1369046
Assignee:
BALDOR ELECTRIC COMPANY GFO
Patent Number(s):
9,705,388
Application Number:
13/329,814
Contract Number:
FG36-08GO180132
Resource Relation:
Patent File Date: 2011 Dec 19
Research Org:
BALDOR ELECTRIC COMPANY, Forth Smith, AR (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Other works cited in this record:

Direct axis aiding permanent magnets for a laminated synchronous motor rotor
patent, February 1979

Permanent magnet rotor
patent, September 1983

High efficiency, low cost permanent magnet AC machine
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