A levitation distance sensor for maglev trains capable of compensating cogging effect

Abstract

A levitation distance sensor for maglev trains capable of compensating cogging effect, the probe coil is composed of a displacement detection coil and a compensation coil, wherein the displacement detection coil is composed of two identical 8-shaped detection coils arranged side by side along the track, Two rectangular coils with the same size and opposite winding directions are also arranged along the transverse direction of the track. The width of the detection coil along the longitudinal direction of the track is the length D of the track cogging unit; there are two pairs of compensation coils, and the two pairs of compensation coils are staggered along the longitudinal direction of the track by 1 / 4 The cogging unit length D, a pair of compensation coils are superimposed within the range of a corresponding detection coil; each pair of compensation coils is composed of two columns of compensation coils whose longitudinal distance along the track is 1 / 2 the cogging unit length D. The sensor can compensate the cogging effect, and the detected levitation distance is accurate, reliable and has high precision.

Description

technical field [0001] The invention relates to a non-contact distance sensor for the suspension distance of a maglev vehicle. Background technique [0002] The non-contact displacement sensor (spacing sensor) of the suspension distance of the existing maglev vehicle is based on the principle of electromagnetic induction to realize the measurement of the distance. Detection of suspension distance. [0003] There are many types of non-contact displacement sensors based on the principle of electromagnetic induction. The working principle of one type of inductive non-contact displacement sensor is: when there is a metal object near the energized sensor detection coil (probe coil), due to the change of the metal object The reluctance of the induced electromagnetic field magnetic circuit generated by the detection coil can affect the inductance of the coil, so the inductance of the coil is related to the distance between the coil and the metal body, and the relationship is L=N ...

AI Technical Summary

Problems solved by technology

However, because the track of the high-speed maglev train is a long stator track with alternating teeth and slots, the teeth on the track are all metal bodies, and the slots are slots opened on the metal body, and cables are wound in the slots. When the inductive displacement sensor is in the long When moving on the surface of the stator track, the output value will change with the periodic change of the track cogging, the so-called cogging effect occurs, and the measurement error of the vertical spacing value (also called cogging error) occurs. This cogging The error makes the detection output value inaccurate, which cannot meet the requirements of real-time and precise control of high-speed maglev vehicles to ensure that the suspension distance is high-precision, constant and consistent

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