Device for detecting rotation of a rotatable element

摘要

The arrangement has an electrically conducting partial surface provided on a plane surface of rotating units. Fixed sensor units have excitation electrodes (4) and receiver electrodes (8a, 8b) that are adjacent to the excitation electrodes. The electrodes stay at a distance opposite to the partial surface. The receiver electrodes and the partial surface are designed in a form of thinner metallic layers. The receiver electrodes are capacitvely coupled with the excitation electrodes during rotation of rotating units by the partial surface.