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1. (WO2014204469) ELECTRIC MACHINE HAVING ROTOR WITH SLANTED PERMANENT MAGNETS

Pub. No.:    WO/2014/204469    International Application No.:    PCT/US2013/046847
Publication Date: Thu Dec 25 00:59:59 CET 2014 International Filing Date: Fri Jun 21 01:59:59 CEST 2013
IPC: H02K 16/04
Applicants: OTIS ELEVATOR COMPANY
Inventors: PIECH, Zbigniew
TANGUDU, Jagadeesh
HIMMELMANN, Richard A.
Title: ELECTRIC MACHINE HAVING ROTOR WITH SLANTED PERMANENT MAGNETS
Abstract:
An electric machine including a rotor and an annularly-shaped first stator is provided. The rotor includes an annularly-shaped rotor body and permanent magnets positionally-fixed relative to the rotor body. The first stator includes circumferentially-spaced stator poles. The rotor and the first stator are concentric and axially-aligned relative to an axial centerline of the electric machine. Each of the permanent magnets creates a magnetic dipole. Each magnetic dipole extends along a dipole axis that passes through the respective permanent magnet. Each dipole axis extends in a first plane. The centerline of the electric machine extends in a second plane that is at least substantially perpendicular to the first plane. Each of the permanent magnets is positioned so that a magnet angle that is between 15° and 75° is defined between the respective dipole axis and a radial axis that extends between the respective permanent magnet and the centerline.