Rotary Transformer

Abstract

The objective of this invention is to reduce the high harmonic content of the magnetic flux distribution on the detection coil and improve the detection accuracy of the movement of a moving body. A rotary transformer is provided, comprising an excitation coil receiving an excitation signal as input and a detection coil outputting a detection signal, and detecting the movement of a moving body on which one of the excitation coil and the detection coil is provided based on the detection signal. In the aforementioned rotary transformer, the coil patterns of the excitation coil and the detection coil are planar, and at least one of the excitation coil and the detection coil is formed with a coil pattern including a sinusoidal wave pattern.

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