Mr. Chengjun Liu Profile

Chengjun Liu

at Harbin Institute of Technology

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Proceedings Article | 12 January 2009 Paper

Characteristic analysis of contactless transformer

Chengjun Liu, Jibin Zou, Xinghe Fu

Proceedings Volume 7133, 71331G (2009) https://doi.org/10.1117/12.810623

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The mathematical model of reflected reactance supplied by voltage source is established to deeply analyze the coupling characteristic and power transfer characteristic of a contactless transformer used in angle sensor. Firstly, the molding method is studied based on the structure feature of contactless transformers with pot core. Then, the primary and secondary equivalent circuits of a transformer supplied by voltage source are obtained by using the mutual inductance model with contactless electromagnetic coupling structure. On the basis of which, the mathematical model of reflected reactance is derived, and the expressions of some characteristics parameters, such as voltage gain and output power, are obtained. Finally, the prototype of a contactless transformer is made according to the design parameters calculated by means of the finite element model. The experiment shows that the mathematical model can be used to accurately analyze the coupling characteristics and power transfer characteristics of contactless transformers.

Proceedings Article | 12 January 2009 Paper

Error measuring system of rotary Inductosyn

Chengjun Liu, Jibin Zou, Xinghe Fu

Proceedings Volume 7133, 71330X (2009) https://doi.org/10.1117/12.810627

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The inductosyn is a kind of high-precision angle-position sensor. It has important applications in servo table, precision machine tool and other products. The precision of inductosyn is calibrated by its error. It's an important problem about the error measurement in the process of production and application of the inductosyn. At present, it mainly depends on the method of artificial measurement to obtain the error of inductosyn. Therefore, the disadvantages can't be ignored such as the high labour intensity of the operator, the occurrent error which is easy occurred and the poor repeatability, and so on. In order to solve these problems, a new automatic measurement method is put forward in this paper which based on a high precision optical dividing head. Error signal can be obtained by processing the output signal of inductosyn and optical dividing head precisely. When inductosyn rotating continuously, its zero position error can be measured dynamically, and zero error curves can be output automatically. The measuring and calculating errors caused by man-made factor can be overcome by this method, and it makes measuring process more quickly, exactly and reliably. Experiment proves that the accuracy of error measuring system is 1.1 arc-second (peak - peak value).

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