Patent ID: 7538460
Filing Date: 2009-05-26
Classification: H02K

Abstract:
1. An integrated motor-position sensor comprising: a motor comprising a rotor assembly including a cylindrical portion having an axis, the cylindrical portion having a plurality of peripherally-spaced radially-projecting rotor teeth, the rotor assembly comprising a permanent magnet, and a stator assembly coaxial with the rotor assembly and having a plurality of radially-projecting stator poles, the stator poles each having a plurality of stator teeth projecting radially to a circle coaxial with the rotor assembly, and coils for electrically energizing the stator poles to generate driving magnetic flux that controls a position of the rotor, at least one stator pole divided by a channel that defines an upper stator pole portion and a lower stator pole portion, and a plurality of sensing coils placed to intercept magnetic flux between a plurality of the stator poles and a plurality of rotor teeth, at least one of the sensing coils passing through the channel, the sensing coils generating a signal responsive to variations in both the driving magnetic flux and the relative position of the rotor assembly with respect to the stator assembly.