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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.
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Issue Date:
OSTI Identifier:
Patent Number(s):
Application Number:
Contract Number:
Resource Relation:
Patent File Date: 2011 Dec 19
Research Org:
BALDOR ELECTRIC COMPANY, Forth Smith, AR (United States)
Sponsoring Org:
Country of Publication:
United States

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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Permanent magnet laminated rotor with conductor bars
patent, February 1986

Method of fabricating composite rotor laminations for use in reluctance, homopolar and permanent magnet machines
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Rotor for an electric motor
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Permanent magnet synchronous motor
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Rotor for an electric motor
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Cogging reduction in permanent magnet machines
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Interior permanent magnet motor and rotor
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Rotor for an electric motor
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Interior Permanent Magnet Motor Including Rotor With Flux Barriers
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Self-Starting Type Permanent Magnet Synchronous Motor and a Compressor Using the Same
patent-application, June 2009

Rotational Angle Detection Device And Method For Permanent Magnet Dynamo-Electric Machine And Electric Power Steering Device
patent-application, July 2009

Permanent-Magnet (PM) Rotors and Systems
patent, June 2010

Self-Starting Permanent Magnet Synchronous Motor And Compressor And Refrigeration Cycle Using The Same
patent-application, February 2011

Method And Apparatus For Compensating A Line Synchronous Generator
patent, June 2011

Permanent Magnet Excited Synchronous Machine With Embedded Magnets
patent-application, July 2012

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