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US 10,209,096 B2Granted
Rotation detecting device
AssigneeHirose Electric Co., Ltd.
InventorsShoji Oyama, Atsushi Kasuga
Life of this patent
Estimating the term…
Abstract
A rotation detecting device includes a plurality of magnetic field generating portions; a magnetic member; a coil wound around the magnetic member; and a magnetic field introducing portion. The magnetic field introducing portion introduces a magnetic flux generated by the magnetic field generating portion to pass through the magnetic member when the magnetic field generating portion passes through a specific location.
Claims9
A rotation detecting device configured to detect a rotation of a rotational member relative to a base member, comprising:
- a first magnetic field generating portion attached to the rotational member and arranged to align with a circumferential direction of the rotational member;
- a second magnetic field generating portion attached to the rotational member and arranged to align with the circumferential direction of the rotational member;
- a magnetic member attached to the base member and disposed inside a rotational path of the first magnetic field generating portion and the second magnetic field generating portion;
- a coil disposed around the magnetic member;
- and
- a magnetic field introducing portion attached to the base member and arranged between the rotational path of the first magnetic field generating portion and the second magnetic field generating portion and the magnetic member,
- wherein said first magnetic field generating portion has a first magnetic field in a first magnetic direction perpendicular to a rotational axis of the rotational member,
- said second magnetic field generating portion has a second magnetic field in a second magnetic direction perpendicular to the rotational axis of the rotational member,
- said second magnetic field generating portion is arranged so that the second magnetic direction is opposite to the first magnetic direction,
- said magnetic member is extended in parallel to the rotational axis of the rotational member,
- said magnetic member has a third magnetic field in a third magnetic direction in parallel to the rotational axis of the rotational member,
- said magnetic member is configured to have the third magnetic field in the third magnetic direction that can be reversed by the first magnetic field and the second magnetic field, and
- said magnetic field introducing portion is arranged to introduce a magnetic flux of one of the first magnetic field generating portion and the second magnetic field generating portion to pass through the magnetic member in parallel to the rotational axis of the rotational member when the one of the first magnetic field generating portion and the second magnetic field generating portion passes through a specific location on the rotational path thereof.
10 more elements
Dependencies are inferred from the claim text.