Measurement of position deviation and eccentricity for ?-disc-type inductive micro-motor
An innovative capacitive gap-sensing readout circuit is proposed. Each capacitor pair is constituted by the iron core of EM poles and the disc. The induced capacitance change is fairly sensitive with respect to air gap change. The gap-sensing readout circuit is intrinsically immune to parasitic capacitances. The eccentricity of disc is also quantified by an innovative measurement method.
eccentricity inductive micro-motor air gap measurement differential capacitive circuit