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US 2026/0029286 A1Published application
Detector
AssigneeDenso Corporation
InventorsYoshihiro KIDA, Sadahiro AKAMA, Harumi HORIHATA, Akihiro HANDA
Life of this patent
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Abstract
A detector is adapted to a machine including a rotating body. The detector includes a bearing, a detection target, a receiving coil and an excitation coil. The bearing rotatably supports the rotating body relative to a base portion of the machine. The receiving coil includes an outer coil and an inner coil. The excitation coil receives an AC excitation voltage. The outer coil and the inner coil output an AC voltage signal having an amplitude varying with a displacement of the detection target in a direction perpendicular to an axial direction, in response to the excitation coil receiving the AC excitation voltage.
Claims17
A detector adapted to a machine including a rotating body, the detector comprising:
- a bearing rotatably supporting the rotating body relative to a base portion of the machine;
- a detection target extending in a circumferential direction of the bearing and having an annular shape concentric with the bearing;
- a receiving coil having a planar shape and extending in a radial direction of the bearing, the receiving coil fixed to the base portion and arranged at a position facing the detection target in an axial direction of the bearing;
- and
- an excitation coil configured to receive an AC excitation voltage, wherein
- the detection target is configured to rotate with the rotating body,
- the receiving coil includes:
- an outer coil configured to induce a voltage in response to the excitation coil receiving the AC excitation voltage;
- and
- an inner coil configured to induce a voltage having a same phase as a phase of the voltage induced in the outer coil, in response to the excitation coil receiving the AC excitation voltage,
- the outer coil is positioned radially outward relative to the inner coil,
- in a plan view of the outer coil and the inner coil, one radial end of the outer coil and one radial end of the inner coil extend beyond corresponding radial ends of the detection target, and
- the outer coil and the inner coil are configured to output an AC voltage signal having an amplitude varying with a displacement of the detection target in a direction perpendicular to the axial direction, in response to the excitation coil receiving the AC excitation voltage.
10 more elements
A detector adapted to a machine including a rotating body, the detector comprising:
- a bearing rotatably supporting the rotating body with respect to a base portion of the machine;
- a first detection target extending in a circumferential direction of the bearing and having an annular shape concentric with the bearing;
- a second detection target extending in the circumferential direction and having an annular shape concentric with the bearing a receiving coil having a planar shape and extending in a radial direction of the bearing, the receiving coil fixed to the base portion and arranged at a position facing the detection target in an axial direction of the bearing;
- and
- an excitation coil configured to receive an AC excitation voltage, wherein
- the first detection target and the second detection target are configured to rotate with the rotating body,
- the second detection target is arranged at a position facing the first detection target in the axial direction,
- recesses and protrusions are alternately arranged in the circumferential direction in the first detection target and the second detection target,
- the recesses are recessed in the axial direction,
- the protrusion protrude in the axial direction relative to the recesses,
- the recesses and the protrusions in the first detection target are arranged to face the recesses and the protrusions in the second detection target,
- the receiving coil includes:
- a first intermediate coil at a position facing the first detection target;
- and
- a second intermediate coil at a position facing the second detection target,
- the first intermediate coil and the second intermediate coil are configured such that the first intermediate coil induces a voltage having a same phase as a voltage induced in the second intermediate coil, in response to the excitation coil receiving the AC excitation voltage, and
- the detector further comprises at least one of (i) a circuit and (ii) a processor with a memory storing computer program code executable by the processor, the at least one of the circuit and the processor configured to cause the detector to:
- calculate a differential voltage as a difference between an output voltage signal of the first intermediate coil and an output voltage signal of the second intermediate coil;
- and
- calculate a force acting on the rotating body in the axial direction, based on the calculated differential voltage.
17 more elements
Dependencies are inferred from the claim text.