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Lamination for a Permanent Magnet Machine

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
A method includes forming a lamination that may be used in a rotor of an interior permanent magnet motor or further processed for use in a line-start interior permanent magnet motor. The lamination has been optimized for low cogging, minimal usage of magnet material, and maximum torque per ampere and may be further processed to include rotor bars slots to allow the lamination's use in connection with an LSIPM. In accordance with the method, the lamination is formed with magnet slots that are radially inward of the outer diameter. The magnet slots are formed in a plurality of V-shaped arrangements. Each V-shaped arrangement has a leading edge and a trailing edge. The leading edge and trailing edge are arranged such that when the leading edge aligns with a stator tooth, the respective trailing edge is generally not aligned with a stator tooth.
Melfi, Michael J. (Richfield, OH), Schiferl, Richard F. (Chagrin Falls, OH), Umans, Stephen D. (Belmont, MA), McElveen, Robert F. (Anderson, SC), Martin, William E. (Greenville, SC)
14/ 271,922
May 7, 2014
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] This invention was made with Government support under agreement no. DE-FG36-08GO180132 awarded by the Department of Energy. The Government has certain rights in this invention.