Verification of Estimation of Gap Displacement for Helical Motor

A helical motor, which is composed of helically-shaped stator and mover, has various advantages. However, in order to control this motor, we need two encoders to measure the translational position and rotational angle of the mover. This paper describes a method of estimating the gap displacement, wh...

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Bibliographic Details
Published inIEEJ JOURNAL OF INDUSTRY APPLICATIONS Vol. 5; no. 2; pp. 148 - 153
Main Authors Arai, Ryoji, Fujimoto, Yasutaka
Format Journal Article
LanguageEnglish
Published 01.01.2016
Subjects
Coders
Displacement
Encoders
Estimates
Helical
Mathematical models
Motors
Stators
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Summary:A helical motor, which is composed of helically-shaped stator and mover, has various advantages. However, in order to control this motor, we need two encoders to measure the translational position and rotational angle of the mover. This paper describes a method of estimating the gap displacement, which is the relative position of the mover from the center of the stator slot. If we can estimate the gap displacement accurately, one of two encoders used by present helical motors can be removed. Our proposed method uses the relation between the gap displacement and the inductance, which is derived from the mathematical model of the helical motor. In order to estimate the gap displacement, high-frequency voltage is injected into the armature windings and a current of the same frequency component is extracted. The validity of the method is confirmed by numerical simulations and experiments.
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ISSN:2187-1094
2187-1108
DOI:10.1541/ieejjia.5.148