Rotation detector and rotation detection method
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorMasaki Tanaka
Life of this patent
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Abstract
Provided is a rotation detector capable of suppressing the occurrence of erroneous detection. Rotation detector includes magnet that rotates together with a rotary shaft, a plurality of power generation elements that generate power according to a change in a magnetic field due to rotation of magnet together with the rotary shaft, and a plurality of magnetic sensors provided to a corresponding one of the plurality of power generation elements. Rotation detector further includes information processor that determines a rotational position of the rotary shaft by using the plurality of magnetic sensors, and generated power supply unit that supplies the power generated by each of the plurality of power generation elements only to the corresponding one of the plurality of power generation elements.
Claims11
A rotation detector comprising:
- a magnet that rotates together with a rotary shaft;
- a plurality of power generation elements that generate power according to a change in a magnetic field due to rotation of the magnet together with the rotary shaft;
- a plurality of magnetic sensors each provided to a corresponding one of the plurality of power generation elements;
- an information processor that determines a rotational position of the rotary shaft by using the plurality of magnetic sensors;
- and a generated power supply unit that supplies power generated by each of the plurality of power generation elements only to the corresponding one of the plurality of magnetic sensors.
A rotation detection method using a rotation detector, the rotation detector including a magnet that rotates together with a rotary shaft, a plurality of power generation elements that generate power according to a change in a magnetic field due to rotation of the magnet together with the rotary shaft, a plurality of magnetic sensors each provided to a corresponding one of the plurality of power generation elements, and a generated power supply unit that supplies power generated by each of the plurality of power generation elements only to the corresponding one of the plurality of magnetic sensors, the method comprising:
- determining in which region among a plurality of regions arranged in a rotation direction of the rotary shaft a reference position in the rotation direction of the rotary shaft is located, based on power generation information indicating a power generation element that has generated power among the plurality of power generation elements and detection information indicating a detection result from a magnetic sensor corresponding to the power generation element among the plurality of magnetic sensors;
- and
- storing a region in which the reference position is determined to be located among the plurality of regions.
Dependencies are inferred from the claim text.