Inductive angle sensor and torque sensor
AssigneeMelexis Technologies SA
InventorLorenzo Lugani
Life of this patent
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Abstract
An inductive angle sensor includes a transmitter coil and an excitation circuit; a first set of receiver coils has a geometry with a first periodicity N; a first movable coupling element has a periodic geometry with said first periodicity N; a second set of receiver coils has a geometry with a second periodicity M smaller than the first periodicity N; a second movable coupling element having a periodic geometry with said second periodicity M; wherein a ratio N/M of the first periodicity N and the second periodicity M is equal to 1.5. A torque sensor includes an inductive angle sensor and a torque bar. A printed circuit board includes the plurality of coils.
Claims9
An inductive angle sensor, comprising:
- at least one transmitter coil for generating an alternating magnetic field;
- at least one excitation circuit for generating an alternating signal for energizing said at least one transmitter coil;
- a first set of receiver coils, each having a geometry with a first periodicity N;
- a second set of receiver coils, each having a geometry with a second periodicity M smaller than the first periodicity N;
- an evaluation circuit for evaluating signals obtained from the first and second set of receiver coils;
- a first movable coupling element for providing an inductive coupling between the at least one transmitter coil and the first set of receiver coils, the first movable coupling element having a periodic geometry with said first periodicity N;
- a second movable coupling element for providing an inductive coupling between the at least one transmitter coil and the second set of receiver coils, the second movable coupling element having a periodic geometry with said second periodicity M;
- wherein a ratio of the first periodicity N and the second periodicity M is equal to 1.5;
- and
- the first and the second periodicity N, M is one of the following combinations:
- i) the first periodicity N is equal to 6 and the second periodicity M is equal to 4;
- or
- ii) the first periodicity N is equal to 9 and the second periodicity M is equal to 6;
- or
- iii) the first periodicity N is equal to 12 and the second periodicity M is equal to 8;
- or
- iv) the first periodicity N is equal to 15 and the second periodicity M is equal to 10;
- or
- v) the first periodicity N is equal to 18 and the second periodicity M is equal to 12.
A printed circuit board comprising:
- at least one transmitter coil for generating an alternating magnetic field;
- a first set of receiver coils, each having a geometry with a first periodicity (N);
- a second set of receiver coils, each having a geometry with a second periodicity M smaller than the first periodicity N;
- wherein the printed circuit board comprises only four layers;
- a ratio of the first periodicity N and the second periodicity M is equal to 1.5;
- and the first and the second periodicity N, M is one of the following combinations:
- i) the first periodicity N is equal to 6 and the second periodicity M is equal to 4;
- or
- ii) the first periodicity N is equal to 9 and the second periodicity M is equal to 6;
- or
- iii) the first periodicity N is equal to 12 and the second periodicity M is equal to 8;
- or
- iv) the first periodicity N is equal to 15 and the second periodicity M is equal to 10;
- or
- v) the first periodicity N is equal to 18 and the second periodicity M is equal to 12.
Dependencies are inferred from the claim text.