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US Patent 7923881 Interior permanent magnet motor and rotor

Patent 7923881 was granted and assigned to A.O. Smith on April, 2011 by the United States Patent and Trademark Office.

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Patent
Patent
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Patent attributes

Current Assignee
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A.O. Smith
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Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
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Patent Number
79238810
Patent Inventor Names
Jeremiah Mattingly0
Alan E. Lesak0
Dan M. Ionel0
Stephen J. Dellinger0
Date of Patent
April 12, 2011
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Patent Application Number
121144600
Date Filed
May 2, 2008
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Patent Citations Received
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US Patent 12129747 Hybrid permanent magnet motor
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US Patent 11951603 Brushless motor system for power tools
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Patent Primary Examiner
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Quyen Leung
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Patent abstract

An electric machine includes a stator and a rotor core positioned adjacent the stator and rotatable about a longitudinal axis. The rotor core includes a plurality of bar apertures, a plurality of elongated flux barriers separate from the bar apertures and positioned radially inward of the bar apertures, and a plurality of magnet slots separate from the bar slots and positioned radially inward of a portion of the bar apertures. The electric machine also includes a plurality of magnets, each positioned in one of the magnet slots. A plurality of conductive bars are each positioned in one of the bar apertures and includes a first end and a second end. A first end ring is coupled to the first end of each of the bars and a second end ring is coupled to the second end of each of the bars.

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