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US 12,716,755 B2Granted
Encoder, servo motor, and servo system
AssigneeKabushiki Kaisha Yaskawa Denki
InventorsKenichi Sadakane, Ryo Inoue, Masanobu Kakihara, Takuya Sato, Hiroshi Takada
Life of this patent
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Abstract
An encoder includes a rotating body that is rotatable around a rotation axis; a disk that is fixed to the rotating body and has a scale formed in a ring shape; an optical module that is disposed to face the disk and detects the scale; a first magnet that is disposed on one side from the disk in a direction of the rotation axis and fixed to the rotating body; and a first magnetic detector that is disposed on a remaining side from the disk in the direction of the rotation axis and detects magnetism of the first magnet.
Claims13
An encoder comprising:
- a rotating body configured to be rotatable around a rotation axis;
- a disk fixed to the rotating body and having a scale formed in a ring shape;
- an optical module disposed to face the disk and configured to detect the scale;
- a first magnet disposed on one side from the disk in a direction of the rotation axis and fixed to the rotating body;
- a first magnetic detector disposed on a remaining side from the disk in the direction of the rotation axis and configured to detect magnetism of the first magnet;
- the disk is made of a non-magnetic material,
- the rotating body supports the disk such that the disk covers the remaining side of the first magnet,
- the first magnetic detector detects the magnetism of the first magnet that has passed through the disk,
- a gap is formed between the disk and the first magnet in the direction of the rotation axis,
- the first magnet includes a plurality of sub-magnets arranged with a gap between each other along a circumferential direction around the rotation axis such that each of the plurality of sub-magnets has a magnetic pole in the direction of the rotation axis and adjacent sub-magnets have different magnetic poles,
- each of the plurality of sub-magnets included in the first magnet has an arc shape, and
- the first magnetic detector is disposed such that a center of the first magnetic detector is located radially inward from a rotation trajectory of the plurality of sub-magnets that is generated by rotation of the rotating body in a radial direction around the rotation axis.
9 more elements
An encoder comprising:
- a rotating body configured to be rotatable around a rotation axis;
- a disk fixed to the rotating body and having a scale formed in a ring shape;
- an optical module disposed to face the disk and configured to detect the scale;
- a first magnet disposed on one side from the disk in a direction of the rotation axis and fixed to the rotating body;
- a first magnetic detector disposed on a remaining side from the disk in the direction of the rotation axis and configured to detect magnetism of the first magnet;
- a second magnet fixed to the rotating body at a position on the rotational axis;
- and
- a second magnetic detector disposed to face the second magnet and configured to detect magnetism of the second magnet,
- wherein the rotating body supports the first magnet such that the first magnet is disposed on an outer peripheral side from the second magnet in the radial direction centered on the rotation axis.
6 more elements
An encoder comprising:
- a rotating body configured to be rotatable around a rotation axis;
- a disk fixed to the rotating body and having a scale formed in a ring shape;
- an optical module disposed to face the disk and configured to detect the scale;
- a first magnet disposed on one side from the disk in a direction of the rotation axis and fixed to the rotating body;
- a first magnetic detector disposed on a remaining side from the disk in the direction of the rotation axis and configured to detect magnetism of the first magnet;
- a substrate with the first magnetic detector being disposed on a surface of the substrate on the remaining side thereof;
- a battery disposed on the surface of the substrate on the remaining side and configured to supply power to at least a portion of circuits of the substrate when external power is not supplied to the encoder;
- a connector disposed on the surface of the substrate on the remaining side;
- and
- a cable connected to the connector and routed through a space between the first magnetic detector and the battery.
7 more elements
Dependencies are inferred from the claim text.