US 2007/0164733 A1Published application

Magnetic encoder device and actuator

AssigneeKabushiki Kaisha Yaskawa Denki

InventorsTakefumi Kabashima, Ryuichiro Tominaga, Kazutoshi Imai, Yuji Arinaga, Motomichi Ohto, Hirotoshi Hayakawa

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Abstract

Provided is a magnetic encoder device capable of detecting a rotating angle of an actuator having a cavity structure. The magnetic encoder device includes a ring-shaped rotating body 11, a ring-shaped permanent magnet 12 which is inscribed in and fixed to an inner circumferential side of the ring-shaped rotating body 11 and magnetized in a direction perpendicular to a center axis of the rotating body 11, and a fixed body 13 which is disposed on an inner circumferential side of the permanent magnet 12 through an air gap and has a circular circumference and a cavity, and a magnetic field detecting element 14 disposed on an outer circumferential side of the fixed body 13 through the permanent magnet 12 and the air gap.

Claims15

Dependent claims

A magnetic encoder device comprising:

a magnetic encoder including a permanent magnet fixed to a rotating body and a magnetic field detecting element which faces the permanent magnet through an air gap and is fixed to a fixed body, and
a signal processing circuit which processes a signal from the magnetic field detecting element, wherein
the rotating body has a ring shape,
the permanent magnet has a ring shape, is inscribed in and fixed to an inner circumferential side of the rotating body and magnetized in parallel to a direction perpendicular to a center axis of the rotating body,
the fixed body has a circular outer circumference and a cavity and is disposed at an inner circumferential side of the permanent magnet through the air gap, and
the magnetic field detecting element is disposed on an outer circumferential side of the fixed body through the permanent magnet and the air gap.

3 more elements

Dependencies are inferred from the claim text.