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Journal ArticleDOI

Absolute and Noncontact Type Displacement Sensor using Transmission Line for Detecting Multiple Targets

About: This article is published in Ieej Transactions on Sensors and Micromachines.The article was published on 2004-01-01 and is currently open access. It has received 2 citations till now. The article focuses on the topics: Displacement (vector) & Standing wave ratio.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a common mode equivalent circuit usable for calculating common mode current and bearing current of a 0.75kW induction motor driven by PWM inverter is proposed at first.
Abstract: In this paper, a common mode equivalent circuit usable for calculating common mode current and bearing current of a 0.75kW induction motor driven by PWM inverter is proposed at first. Next, motor capacitance formulas are presented and those values are calculated for the motor, and these values are compared with experimental results. Calculated common mode impedance versus frequency based on proposed circuit is also compared with that of experimental results, and both characteristics are agree well. Finally, the validation of the proposed common mode equivalent circuit is demonstrated by the fact that the proposed circuit reproduce the experimental results of common mode current and bearing current.

8 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented an identification technique of parameters of a high-frequency equivalent circuit of a permanent magnet synchronous motors (PMSM) driven by a PWM inverter.
Abstract: This paper presents an identification technique of parameters of a high-frequency equivalent circuit of permanent magnet synchronous motors (PMSM) driven by a PWM inverter. The high-frequency oscillatory currents such as leakage current to the motor frame (common-mode current) and high-frequency oscillatory line current (normal-mode current) are generated by switching instants of inverter transistors. The parameters of the high-frequency equivalent circuit of PMSM which can simulate the oscillating current are identified by means of genetic algorithm. It is shown that the high-frequency equivalent circuit with identified parameters can generate the oscillating current by some simulation results. © 2009 Wiley Periodicals, Inc. Electr Eng Jpn, 167(4): 57–66, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20717

4 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the fringing field at the open end of the transmission line was perturbed by an unknown dielectric material, and the results showed that the method has sufficient accuracy for most applications up to about 4 GHz.
Abstract: The method is based on perturbing the fringing field at the open end of the transmission line by an unknown dielectric material, and is applicable not only for solid dielectric materials but also for liquids and gases. Forming or shaping of solid dielectrics is not required, but there should be a small area available for contact. Thickness of the dielectric material terminating the line does not affect the measurement unless the material is thinner than twice the spacing between conductors of the coaxial line. The experimental results obtained for some solid dielectric materials, liquids, and biological tissue shows that the method has sufficient accuracy for most applications up to about 4 GHz.

94 citations

Journal ArticleDOI
TL;DR: In this article, the design of permanent magnet structures providing the triangular profile of the magnetic induction, in an air gap, is discussed, and a comparison with previous structures providing a trapezoidal profile of magnetic induction is presented.
Abstract: Discusses the design of novel permanent magnet structures providing the triangular profile of the magnetic induction, in an airgap. Geometric optimization of these yoked and yokeless structures is carried out by 2-D finite element analysis, for displacement sensor application. Experimental results are in good agreement with analytic calculations. A comparison with previous structures providing a trapezoidal profile of the magnetic induction is presented. >

28 citations

Journal ArticleDOI
01 Apr 1997
TL;DR: In this article, the authors describe a linear displacement sensor utilizing giant magnetoresistance (GMR) elements, which is based on the division of a magnetically soft layer of a spin valve device into two anti-parallel magnetic domains.
Abstract: We describe the development of a novel linear displacement sensor utilizing Giant Magnetoresistance (GMR) elements. This device is based on the division of a magnetically soft layer of a spin valve device into two anti-parallel magnetic domains. The total resistance of the spin-valve varies linearly with displacement of the domain wall because of different resistances of the aligned and anti-aligned magnetic states of the spin-valve. Domain wall translation is achieved by the use of a magnetic wall "trap" generated by permanent magnets. Displacement is thus related directly to the device resistance.

21 citations

Proceedings ArticleDOI
12 May 1992
TL;DR: In this paper, a capacitive displacement measuring system using a very linear oscillator, shielding and a three-signal approach is described, which achieves an accuracy of 1 mu m over a 1-mm range.
Abstract: A high-performance, capacitive displacement measuring system is described. Using a very linear oscillator, shielding and a three-signal approach, most of the errors are eliminated. The accuracy amounts to 1 mu m over a 1-mm range. Since the output of the oscillator can be directly connected to a microcontroller, an analog-to-digital (A/D) converter is not needed. The system was tested in a fully automated setup, using an electrical XY table, the described sensor and a personal computer. Nonlinearity, long-term stability, and repeatability were verified. >

5 citations