Rotation detector and rotation detection method
AssigneeRicoh Company, Ltd.
InventorTatsuya KAWASE
Life of this patent
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Abstract
A rotation detector detecting rotation of a rotor, based on a signal produced according to rotation of the rotor, having a waveform according to a rotational cycle thereof, includes a signal obtaining unit to obtain two signals having phases different from each other; a vector operating unit to determine a vector according to a rotational angle of the rotor, based on the two signals; and a rotation detecting unit to detect rotation of the rotor, based on the vector. The two signals are produced from two elements located at positions farthest in a rotational angle of the rotor among plural rotation detecting elements located at positions different from each other.
Claims10
A rotation detector detecting rotation of a rotor, based on a signal produced according to rotation of the rotor, having a waveform according to a rotational cycle thereof, comprising:
- a signal obtaining unit configured to obtain two signals having phases different from each other;
- a vector operating unit configured to determine a vector according to a rotational angle of the rotor, based on the two signals;
- and
- a rotation detecting unit configured to detect rotation of the rotor, based on the vector,
- wherein the two signals are produced from two elements located at positions farthest in a rotational angle of the rotor among plural rotation detecting elements located at positions different from each other.
A rotation detector detecting rotation of a rotor based on a signal produced according to rotation of the rotor, having a waveform according to a rotational cycle thereof, comprising:
- a signal obtaining unit configured to obtain two signals having phases different from each other;
- a vector operating unit configured to determine a vector according to a rotational angle of the rotor, based on the two signals;
- and
- a rotation detecting unit configured to detect rotation of the rotor, based on the vector,
- wherein each of the two signals is produced when the rotation of the rotor is detected in each of positions far from each other by 90 to 270° in a rotational angle of the rotor.
A method of detecting rotation of a rotor, based on signals produced from plural rotation detecting elements located at positions different from each other in a rotational angle of a rotor, having a waveform according to a rotational cycle thereof, comprising:
- obtaining two signals having phases different from each other, produced from two rotation detecting elements located at positions farthest from each other among the plural rotation detecting elements;
- determining a vector according to a rotational angle of the rotor, based on the two signals;
- and
- detecting rotation of the rotor, based on the vector.
Dependencies are inferred from the claim text.