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US 7,775,129 B2Granted
Rotation angle sensor
AssigneePanasonic Corporation
InventorsKouji Oike, Kiyotaka Uehira, Kiyotaka Sasanouchi
Life of this patent
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Abstract
A rotation angle sensor is provided with a shaft portion having a torsion bar, a rotation angle sensing portion for detecting rotation angle of the shaft portion, and a torque sensing portion for detecting angle of torsion of the torsion bar. The rotation angle sensing portion and the torque sensing portion improve their own detecting accuracies by using each other's detecting result, whereby the rotation angle sensor can detect rotation angle and angle of torsion of a multi-turn rotatable body with high accuracy and high resolution.
Claims6
A rotation angle sensor comprising:
- a shaft portion having a torsion bar;
- a rotation angle sensing portion for detecting rotation angle of the shaft portion;
- and
- a torque sensing portion for detecting angle of torsion of the torsion bar;
- wherein:
- the rotation angle sensing portion improves its own detecting accuracy by using results of detection by the torque sensing portion;
- the rotation angle sensing portion detects the rotation angle of the shaft portion based on rotation angle of an input side or an output side of the torsion bar which is used by the torque sensing portion when detecting the angle of torsion of the torsion bar;
- the rotation angle sensing portion includes:
- a first rotatable body which is joined to the shaft portion and which rotates in synchronism with rotation of the shaft portion;
- a second rotatable body which is not joined to the shaft portion and which rotates in synchronism with rotation of the first rotatable body;
- and
- a first sensing part for detecting rotation angle of the second rotatable body;
- and
- the second rotatable body rotates at a lower speed than the first rotatable body.
11 more elements
A rotation angle sensor comprising:
- a shaft portion having a torsion bar;
- a rotation angle sensing portion for detecting rotation angle of the shaft portion;
- and
- a torque sensing portion for detecting angle of torsion of the torsion bar;
- wherein:
- the rotation angle sensing portion improves its own detecting accuracy by using results of detection by the torque sensing portion;
- the rotation angle sensing portion detects the rotation angle of the shaft portion based on rotation angle of an input side or an output side of the torsion bar which is used by the torque sensing portion when detecting the angle of torsion of the torsion bar;
- the rotation angle sensing portion includes:
- a first rotatable body which is joined to the shaft portion and rotates in synchronism with rotation of the shaft portion;
- a second rotatable body which rotates in synchronism with rotation of the first rotatable body;
- a third rotatable body which rotates in synchronism with rotation of the second rotatable body;
- and
- first and second sensing parts for detecting rotation angles of the second and third rotatable bodies;
- and
- the ratio of the number of revolutions of the second rotatable body to the number of revolutions of the first rotatable body and the ratio of the number of revolutions of the third rotatable body to the number of revolutions of the first rotatable body differ from each other.
12 more elements
A rotation angle sensor comprising:
- a shaft portion having a torsion bar;
- a rotation angle sensing portion for detecting rotation angle of the shaft portion;
- and
- a torque sensing portion for detecting angle of torsion of the torsion bar;
- wherein:
- the rotation angle sensing portion improves its own detecting accuracy by using results of detection by the torque sensing portion;
- the rotation angle sensing portion detects the rotation angle of the shaft portion based on rotation angle of an input side or an output side of the torsion bar which is used by the torque sensing portion when detecting the angle of torsion of the torsion bar;
- the torque sensing portion includes first and second resolver mechanisms each having a resolver excitation winding joined to the torsion bar and a resolver output winding which outputs a signal corresponding to rotation angle of the torsion bar produced by excitation by the resolver excitation winding as a result of rotation of the torsion bar, and
- the first resolver mechanism is disposed at the input side of the torsion bar and the second resolver mechanism is disposed at the output side of the torsion bar.
6 more elements
Dependencies are inferred from the claim text.