Rotation detector and rotation detection method
AssigneeRicoh Company, Ltd.
InventorTatsuya Kawase
Life of this patent
Estimating the term…
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.
Claims19
A rotation detector for 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 select from signals produced from plural rotation detecting elements including plural sets of rotation detecting elements and individual rotation detecting elements in each set of the plural sets of the rotation detecting elements being located at different positions relative to a rotation angle of the rotor and having a same phase, two signals having different phases produced from two of the plural rotation detecting elements located farthest relative to the rotation angle of the rotor;
- 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.
A rotation detector for 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 select from signals produced from plural rotation detecting elements including plural sets of rotation detecting elements and individual rotation detecting elements in each set of the plural sets of the rotation detecting elements being located at different positions relative to a rotation angle of the rotor and having a same phase, two signals having different phases produced from two of the plural rotation detecting elements located farthest relative to the rotation angle of the rotor;
- 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:
- selecting from signals produced from plural rotation detecting elements including plural sets of rotation detecting elements and individual rotation detecting elements in each set of the plural sets of the rotation detecting elements being located at different positions relative to a rotation angle of the rotor and having a same phase, two signals having different phases produced from two of the plural rotation detecting elements located farthest relative to the rotation angle of the rotor;
- 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.
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 operating part configured to perform rotation operation on the vector for a detective angle set;
- and
- a detective angle setting part configured to set the detective angle such that the vector after subjected to the rotation operation follows a specified standard angle to detect rotation of the rotor, based on the detective angle;
- wherein the detective angle setting part is further configured to determine whether the vector after subjected to the rotation operation follows the specified standard angle, based on at least one of components forming the vector subjected to the rotation operation.
Dependencies are inferred from the claim text.