TY - GEN
T1 - Radial position deviation measurement for inductive micro-motor
AU - Lin, Chih Che
AU - Tsai, Nan Chyuan
PY - 2014/3/9
Y1 - 2014/3/9
N2 - An innovative capacitive gap-sensing readout circuit to replace traditional gap sensor is designed and verified by computer simulations and experiments to measure the motion of the levitated micro-disc embedded in an inductive micro-motor. Twelve equivalent capacitor pairs are constructed to detect the position deviation of the disc at motion mode. Each capacitor pair is constituted by the cross-sectional facet of iron core at electromagnetic pole and the circular brim of disc made of aluminum. As the radial position deviation of disc occurs, the capacitances of the corresponding capacitor pairs are altered due to air gap changes. The major functions of the proposed capacitive gap-sensing readout circuit are: (i) to amplify a micro-meter-scale signal to be of mini-meter-scale, (ii) to suppress the low-frequency noises caused by exerted 3-phase AC power, (iii) to rectify the induced AC gap-sensing signal into a DC output voltage, and (iv) to eliminate the undesired DC bias caused by parasitic capacitances. By commercial software, Multisim, and a few realistic experiments undertaken, the performance of the proposed capacitive gap-sensing readout circuit has been successfully verified. The mean of output voltage of gap-sensing readout circuit is about 327mV under the position deviation of the disc being 8μm.
AB - An innovative capacitive gap-sensing readout circuit to replace traditional gap sensor is designed and verified by computer simulations and experiments to measure the motion of the levitated micro-disc embedded in an inductive micro-motor. Twelve equivalent capacitor pairs are constructed to detect the position deviation of the disc at motion mode. Each capacitor pair is constituted by the cross-sectional facet of iron core at electromagnetic pole and the circular brim of disc made of aluminum. As the radial position deviation of disc occurs, the capacitances of the corresponding capacitor pairs are altered due to air gap changes. The major functions of the proposed capacitive gap-sensing readout circuit are: (i) to amplify a micro-meter-scale signal to be of mini-meter-scale, (ii) to suppress the low-frequency noises caused by exerted 3-phase AC power, (iii) to rectify the induced AC gap-sensing signal into a DC output voltage, and (iv) to eliminate the undesired DC bias caused by parasitic capacitances. By commercial software, Multisim, and a few realistic experiments undertaken, the performance of the proposed capacitive gap-sensing readout circuit has been successfully verified. The mean of output voltage of gap-sensing readout circuit is about 327mV under the position deviation of the disc being 8μm.
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U2 - 10.1109/3M-NANO.2014.7057296
DO - 10.1109/3M-NANO.2014.7057296
M3 - Conference contribution
AN - SCOPUS:84988234068
T3 - 2014 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, 3M-NANO 2014 - Conference Proceedings
SP - 224
EP - 229
BT - 2014 International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, 3M-NANO 2014 - Conference Proceedings
A2 - Kallio, Pasi
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 4th International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, 3M-NANO 2014
Y2 - 27 October 2014 through 31 October 2014
ER -