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US Patent 7994680 Motor including electrical sheets having shear droops

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Patent
Patent

Patent attributes

Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7994680
Date of Patent
August 9, 2011
Patent Application Number
12361118
Date Filed
January 28, 2009
Patent Primary Examiner
‌
Quyen Leung
Patent abstract

A motor includes an output shaft rotatably provided, a rotor fixed to the output shaft and rotatable with the output shaft, a stator formed by a lamination of plurality of electrical steel sheets made by a magnetic material, the electrical steel sheets being punched by means of a press working, a coil wound at the stator, and a case accommodating the stator and the rotor and including a holder for holding the stator. The electrical steel sheets are arranged at one end of the stator in a lamination direction thereof and at the other end of the stator in the lamination direction thereof respectively. The electrical steel sheets include surfaces each at which a shear droop is formed. The surfaces of the electrical steel sheets face each other.

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