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US 10,203,225 B2Granted
Rotation detector
AssigneeNsd Corporation
InventorsHideki Kimata, Tomoshi Takatsuka
Life of this patent
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Abstract
A rotation detector includes the following: a rotor and stators comprising a rotor substrate and stator substrates, each of which is a multilayer substrate; a rotor coil provided on the rotor substrate; and detection coils provided on the stator substrates. The frequency of an excitation signal used by said rotation detector is set so as to be higher than a prescribed frequency that would be required if the rotor and the stators were each made of a magnetic material.
Claims9
A rotation detector, comprising:
- a rotor substrate, which is a multilayer substrate that forms a rotor, and a pair of stator substrates, each of which is a multilayer substrate that forms a stator, the rotor substrate and the pair of stator substrates made of no magnetic material;
- a rotor coil, which is disposed on the rotor substrate;
- and
- detection coils, which are disposed on the pair of stator substrates,
- wherein a relative angle of rotation between the rotor substrate and the pair of stator substrates is detected based on detection signals induced in the detection coils when the rotor coil is excited with an excitation signal, and
- wherein a frequency of the excitation signal is, without increasing the magnitude of the excitation signal current, set to be higher than a predetermined frequency required in a case where each of the rotor and the stator is made of a magnetic material.
3 more elements
Dependencies are inferred from the claim text.