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1. (WO2017148917) ROTATIONAL ANGLE SENSOR

Pub. No.:    WO/2017/148917    International Application No.:    PCT/EP2017/054598
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Wed Mar 01 00:59:59 CET 2017
IPC: G01D 5/20
Applicants: ROBERT BOSCH GMBH
Inventors: UTERMOEHLEN, Fabian
MERZ, Andreas
LEIDICH, Stefan
Title: ROTATIONAL ANGLE SENSOR
Abstract:
The invention relates to a rotational angle sensor (10) comprising: a stator element (12), which has a stator transmitting coil (20) and a stator receiving coil (22); a rotor element (14), which is mounted for rotation about an axis of rotation (R) in relation to the stator element (12) and which has a rotor receiving coil (28) and a rotor transmitting coil (30), which are electrically connected to each other; wherein the rotor receiving coil (28) is inductively coupled to the stator transmitting coil (20) such that an electromagnetic field produced by the stator transmitting coil (20) induces a current in the rotor receiving coil (28), which current flows through the rotor transmitting coil (30) such that the rotor transmitting coil (30) produces a further electromagnetic field; wherein the stator receiving coil (22) is inductively coupled to the rotor transmitting coil (30) in such a way that the inductive coupling depends on a rotational angle between the stator element (12) and the rotor element (14), and the further electromagnetic field produced by the rotor transmitting coil (30) induces an angle-dependent alternating voltage in the stator receiving coil (22); wherein the stator transmitting coil (20) has a circular outer partial winding (34a) and a circular inner partial winding (34b), which is arranged within the outer partial winding (34a) and is electrically connected to the outer partial winding (34a) in such a way that the inner partial winding is oriented opposite to the outer partial winding (34a) with respect to a current flow; wherein the rotor receiving coil (28) has a circular outer partial winding (34a) and a circular inner partial winding (34b), which is arranged within the outer partial winding (34a) and is electrically connected to the outer partial winding (34a) in such a way that the inner partial winding is oriented opposite to the outer partial winding (34a) with respect to a current flow; wherein the outer partial winding (34a) of the stator transmitting coil (20) and the outer partial winding (34a) of the rotor receiving coil (28) are oriented with respect to each other; wherein the inner partial winding (34b) of the stator transmitting coil (20) and the inner partial winding (34b) of the rotor receiving coil (28) are oriented with respect to each other.