Miniature synchronous motor
 A bobbin or spool is molded of thermoplastic with one end flange of substantially greater diameter with a plurality of arcuately spaced voids through the flange. A coil is wound on the bobbin and a first ferromagnetic cup with integrally formed spaced finger-like plural pole segments in a circumferential array is axially received over the smaller spool flange and coil with the pole segments extending through the voids in the larger spool flange. A second ferromagnetic stator cup with finger-like spaced plural pole segments in a circumferential array is nested against the larger spool flange with the pole segments interdigitated with the pole segments on the first cup. A third stator member interconnects the first and second stator cups through the spool; and, a permanent magnet rotor is journalled on the third pole segment within the stator pole segments. The larger spool flange has electrical connectors received in slots and attached to the ends of the coil. 
Eaton Corporation
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John P. Jerome C. David G. Allan E.
Duve Klopp Arnold Visin