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| Issue 1295-2 |
| US 6,906,513 B2 |
| Rotary motion detector |
| Paul Dünisch, Burglauer (Germany); Roland Finkler, Erlangen (Germany); Andreas Kuhn, Erlangen (Germany); Christoph Nolting, Hallerndorf (Germany); and Günter Schwesig, Erlangen (Germany) |
| Assigned to Siemens Aktiengesellschaft, Munich (Germany) |
| Filed on Apr. 29, 2003, as Appl. No. 10/425,999. |
| Claims priority of application No. 102 19 091 (DE), filed on Apr. 29, 2002. |
| Prior Publication US 2003/0227286 A1, Dec. 11, 2003 |
| Int. Cl.7G01B 7/30 |
| U.S. Cl. 324—207.25 [324/164] | 9 Claims |
| 1. A rotary motion detector, comprising:
an electrically conducting induction element formed as a hollow cylinder and rotatable about a rotation axis;
an excitation assembly disposed radially inside the induction element and applying an inhomogeneous magnetic field to the
induction element;
a sensor assembly disposed radially inside the induction element, and
a shunt element made of a wire winding and spaced from the rotation axis at a distance that is greater than a distance between
the induction element and the rotation axis, said shunt element guiding the magnetic field from an exit zone to an entry zone
of the excitation assembly and configured to suppress induction of eddy currents in the shunt element,
wherein during a rotation of the induction element about the rotation axis an eddy current is induced in the induction element,
with the sensor assembly acquiring a measurement signal in response to the eddy current.
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