Patent ID: 8847459
Filing Date: 2014-09-30
Classification: H01F,H02K

Abstract:
1. A coil for a slotless rotating electric motor comprising a plurality of loops of conductor of multi-stranded wire construction positioned in a generally circular pattern and pressed together to form a generally cylindrical body, a first generally annular head at a first axial end of the cylindrical body projecting radially outwardly beyond the cylindrical body, and at a second generally annular head a second axial end of the cylindrical body projecting radially inwardly beyond the cylindrical body, with the coil being free of any frame structure for supporting the loops of conductors in the coil once formed; with the loops of conductor comprising generally straight central portions that extend along lines that are generally parallel to, but spaced apart from, a longitudinal central axis of the cylindrical body to define a central opening adapted to receive a rotor of a motor for rotation within the coil about the longitudinal central axis; with the loops of conductor further comprising first axial end portions adjacent the first axial end of the coil that extend generally radially outwardly from the longitudinal central axis to form the first generally annular head; with the loops of conductor further comprising second axial end portions adjacent the second axial end of the coil that extend generally radially inwardly toward, but stopping short of, the longitudinal central axis to form the second generally annular head with an opening therein around the longitudinal central axis; and a plurality of connector output leads to the loops of conductor, with the leads projecting from one of the heads of the coil.