13 October 2006 Design of time grating displacement sensor based on transformer theory with varying coupling coefficient
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Proceedings Volume 6280, Third International Symposium on Precision Mechanical Measurements; 62800C (2006) https://doi.org/10.1117/12.716119
Event: Third International Symposium on Precision Mechanical Measurements, 2006, Urumqi, China
Abstract
Time grating displacement sensor realizes high precision measuring by counting some certain time pulses. Generating a travelling wave, which is related to the measured displacement, is a key tache in measuring process of time grating. Three-phase winding is used to generate travelling wave in field type time grating sensor, but uneven distribution of the winding may arouse measurement error. Tooth-grating structure is adopted to generate travelling wave in differential grating type time grating sensor, but the precision of this type sensor is very sensitive to machining precision of teeth. A new method to generate travelling wave is firstly proposed in this paper. This method is based on transformer theory with varying coupling coefficient. Employing a two pairs of face gears and two transformers structure, the sensor converts the change of rotator's displacement into the varieties of two transformers' coupling coefficient. Then coupling coefficient varieties cause the changes of signals' amplitude in both transformers' secondary coils. When the signals feeding to the two primary coils are two sine waves which have a 90° difference in phase and the positions of two pairs of face gears have a half tooth difference in space, the two signals induced by secondary windings can be added up and generate a travlling wave which is related to the displacement of rotator. According to this principle a novel type of time grating sensor is developed. Experiment results show that the correct signal can be generated and the new time grating sensor can get higher original precision.
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Xihou Chen, Donglin Peng, Xinghong Zhang, Wei Yang, "Design of time grating displacement sensor based on transformer theory with varying coupling coefficient", Proc. SPIE 6280, Third International Symposium on Precision Mechanical Measurements, 62800C (13 October 2006); doi: 10.1117/12.716119; https://doi.org/10.1117/12.716119
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