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US Patent 7777386 Electric machine

Patent 7777386 was granted and assigned to Emerson Electric on August, 2010 by the United States Patent and Trademark Office.

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Current Assignee
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Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7777386
Patent Inventor Names
Gary E. Horst1
Date of Patent
August 17, 2010
Patent Application Number
12024541
Date Filed
February 1, 2008
Patent Primary Examiner
‌
Quyen Leung
Patent abstract

A stator assembly adapted for use in an external rotor electric motor. The assembly includes a stator core having a hub, a plurality of teeth extending radially outward from the hub, a root tooth diameter and an outer diameter. Each tooth has a root, a neck extending from the root and a head opposite the root. The neck has a maximum width. Each adjacent pair of teeth has a pitch measured at the roots of the corresponding teeth. The assembly includes a winding wrapped around each tooth of at least three teeth of the stator core. A ratio of the root tooth diameter of the stator core to the outer diameter of the stator core is less than about 0.75. A ratio of the maximum tooth neck width to the tooth pitch measured at the root of the teeth is greater than about 0.36.

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