High-output magnetic field transducer
AssigneeRobert Bosch GmbH
InventorsWalter Hinke, Harry Kaiser
Life of this patent
Estimating the term…
Abstract
To increase the output amplitude obtained from Wiegand wire transducers, for example of the type used in contactless ignition breaker systems, a flux concentration or flux guide element (3) of highly permeable material, for example high-frequency ferrite core material, is provided surrounding the Wiegand wire (1) and, at least in part, the pick-up coil (2) coupled thereto.
Claims4
High-output magnetic field transducer, particularly for a contactless ignition signal system for use with an internal combustion engine, having
- a mechanically treated ferro-magnetic Wiegand element (1) which abruptly changes its magnetization when exposed to a magnetic field of changing polarity,
- and a pick-up coil (2) surrounding the Wiegand element, and comprising, in accordance with the invention, a flux concentration element (3, 3a, 3b, 3c, 3d, 4, 5, 6, 7) surrounding, at least in part, said Wiegand element (1) along at least a longitudinal portion thereof and being magnetically coupled to the pick-up coil, the flux concentration element comprising highly magnetically permeable material having a magnetization direction changeable in response to the magnetization of said Wiegand element (1);
- and
- wherein said flux concentration element (3, 3a, 3b, 3c, 3d, 4, 5, 6) comprises a tubular structure.
High-output magnetic field transducer, particularly for a contactless ignition signal system for use with an internal combustion engine, having
- a mechanically treated ferro-magnetic Wiegand element (1) which abruptly changes its magnetization when exposed to a magnetic field of changing polarity,
- and a pick-up coil (2) surrounding the Wiegand element, and comprising, in accordance with the invention, a flux concentration element (3, 3a, 3b, 3c, 3d, 4, 5, 6, 7) surrounding, at least in part, said Wiegand element (1) along at least a longitudinal portion thereof and being magnetically coupled to the pick-up coil, the flux concentration element comprising highly magnetically permeable material having a magnetization direction changeable in response to the magnetization of said Wiegand element (1);
- and
- wherein the Wiegand wire element comprises a wire, the pick-up coil is wrapped or wound around the wire, and the highly permeable element comprises a tubular structure at least in part surrounding the wire - pick-up coil combination.
High-output magnetic field transducer, particulary for a contactless ignition signal system for use with a internal combustion engine, having
- a mechanically treated ferro-magnetic Wiegand element (1) which abruptly changes its magnetization when exposed to a magnetic field of changing polarity,
- and a pick-up coil (2) surrounding the Wiegand element, and comprising, in accordance with the invention, a flux concentration element (3, 3a, 3b, 3c, 3d, 4, 5, 6, 7) surrounding, at least in part, said Wiegand element (1) along at least a longitudinal portion thereof and being magnetically coupled to the pick-up coil, the flux concentration element comprising highly magnetically permeable material having a magnetization direction changeable in response to the magnetization of said Wiegand element (1);
- and
- wherein the flux concentration element also constitutes a holding means securing the Wiegand wire and the pick-up coil together to form a single mechanically connected structural element.
Dependencies are inferred from the claim text.