Armature with quiet core construction
Patent 4616151 Issued on October 7, 1986. Estimated Expiration Date: 
December 7, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 7, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1861059 2039547 2648788 3307059 3586893 Electromagnetic driving device Laminated rotor for a synchronous salient-pole electrical machine Armature of rotating machine with means to balance the mutual inductance of adjacent pairs of coils Electric machine rotor having a laminated and segmented rim Patent #: 4489249 AbstractAn armature for a DC motor comprises a laminated core defining poles extending generally axially, each pole comprising a body portion with a winding thereabout and a plurality of axially disposed tooth portions, each tooth portion exhibiting a primary skew of its laminations in one direction while the tooth portions of each pole exhibit a smaller secondary skew in the opposite direction. The primary skew is produced by arms extending circumferentially from radial body portions in consecutive laminations which become progressively longer on one side and shorter on the other side of the body portions. Magnetic force fluctuations between the armature and field magnets of the case are modified so as to produce less audible noise with armature rotation.Other References
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