Rotation detection device and method of manufacturing rotation detection device
AssigneeMitsubishi Electric Corporation
InventorsTakeshi Musha, Yoshinao Tatei, Yoshimasa Watanabe
Life of this patent
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Abstract
A magnet for detection mounted on a rotating shaft rotating about a rotation axis, and a detector disposed opposite to the magnet for detection to detect rotation of the rotating shaft are included. The detector includes a multi-layer circuit board, a recessed groove that is provided in an interlayer of the circuit board, has a center on an extension of the rotation axis, and is orthogonal to the rotation axis, a combined magnetic wire incorporated in the recessed groove and exhibiting a large Barkhausen effect, and a pickup coil formed of wiring conductors on the circuit board and a conductor with which through holes are filled, to surround the combined magnetic wire.
Claims15
A rotation detection device comprising:
- a magnet for detection mounted on a rotating body rotating about a rotation axis;
- and
- a detector configured to detect rotation of the rotating body,
- the detector comprising:
- a multi-layer circuit board disposed opposite to the magnet for detection;
- a combined magnetic wire provided at an interlayer of the multi-layer circuit board, disposed on an extension of the rotation axis, and exhibiting a large Barkhausen effect;
- a pickup coil comprising wirings on the multi-layer circuit board, and a conductor with which through holes provided in the multi-layer circuit board are filled, the pickup coil surrounding the combined magnetic wire;
- and
- a groove provided in the interlayer of the multi-layer circuit board, having a center on the extension of the rotation axis, being orthogonal to the rotation axis, and extending to an edge of a periphery of the interlayer.
A rotation detection device comprising:
- a magnet for detection mounted on a rotating body rotating about a rotation axis;
- and
- a detector configured to detect rotation of the rotating body,
- the detector comprising:
- a multi-layer circuit board disposed opposite to the magnet for detection;
- a combined magnetic wire provided at an interlayer of the multi-layer circuit board, disposed on an extension of the rotation axis, and exhibiting a large Barkhausen effect;
- a pickup coil comprising wirings on the multi-layer circuit board, and a conductor with which through holes provided in the multi-layer circuit board are filled, the pickup coil surrounding the combined magnetic wire;
- and
- cylindrical soft magnetic bodies fitted to both ends of the combined magnetic wire.
A method of manufacturing a rotation detection device that comprises:
- a magnet for detection mounted on a rotating body rotating about a rotation axis;
- and
- a detector disposed opposite to the magnet for detection, to detect rotation of the rotating body,
- the detector comprising:
- a multi-layer circuit board;
- a groove provided in an interlayer of the multi-layer circuit board, having a center on an extension of the rotation axis, and being orthogonal to the rotation axis;
- a combined magnetic wire incorporated in the groove and exhibiting a large Barkhausen effect;
- and
- a pickup coil comprising wirings on the multi-layer circuit board, and a conductor with which through holes are filled, the pickup coil surrounding the combined magnetic wire,
- the method of manufacturing the rotation detection device comprising:
- manufacturing the multi-layer circuit board, the manufacturing the multi-layer circuit board comprising:
- forming the pickup coil comprising the wirings and the conductor with which the through holes are filled;
- forming a laminated body comprising the groove for insertion into which the combined magnetic wire is inserted;
- and
- inserting the combined magnetic wire into the groove comprised in the laminated body.
Dependencies are inferred from the claim text.