BRUSHLESS ELECTRIC MOTOR WITH AN OUTER ROTOR
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United States of America Patent
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Aug 26, 2014
filing date -
Aug 27, 2013
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Abstract
A brushless electric motor with an outer rotor on which permanent magnet elements are arranged, and a stator which has electromagnetic stator poles, wherein the electromagnetic stator poles each have a pole foot, a pole tooth and a pole shoe made of iron materials, and with an insulation layer about the iron elements of the stator poles, and with an electric coil winding which is arranged on the insulation layer, characterized in that the pole shoes have in cross section a free-form rounded portion, preferably in the direction of their end regions, and become narrower running away outward toward the ends at an angle >90° with respect to the pole tooth on the underside of the pole shoe at the location where the insulation layer is applied, wherein the insulation layer on the pole shoe extends on the surface for the coil winding receptacle, that is to say on the basically opposite surface of the insulation layer on the pole shoe, at a right angle with respect to the pole tooth.
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