# US 12,007,253 B2 · Rotation angle detecting device and electric actuator

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,007,253 B2
- Document ID: US12007253B2
- Status: Granted
- Kind: B2
- Application number: 17/348,789
- Filed: 2021-06-16
- Published: 2021-12-23
- Granted: 2024-06-11
- Earliest claimed: 2020-06-17
- Assignees: Nidec Tosok Corporation
- Applicants: Nidec Tosok Corporation
- Inventors: Yosuke Ito; Toshiaki Nakamura
- Web page: https://patentgrep.com/patent/US12007253B2

## CPC

- G01D 5/145: {influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06)}
- G01B 7/30: for measuring angles or tapers; for testing the alignment of axes
- G01D 5/2451: {Incremental encoders (G01D5/2454 takes precedence)}
- H02K 11/215: Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
- G01D 2205/40: Position sensors comprising arrangements for concentrating or redirecting magnetic flux
- G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

An aspect of the disclosure provides a rotation angle detecting device capable of detecting a rotation angle of a rotation body rotatable about a central axis. The rotation angle detecting device includes: a sensor magnet, having multiple magnetic poles provided side-by side in a circumferential direction about the central axis and installed to the rotation body; a magnetic sensor, overlapped with the sensor magnet when viewed in a predetermined first direction and capable of detecting a magnetic field of the sensor magnet; and a pair of magnetic parts, provided to sandwich the magnetic sensor in a second direction intersecting the first direction.

## Claims

### Claim 1

A rotation angle detecting device, capable of detecting a rotation angle of a rotation body rotatable about a central axis, the rotation angle detecting device comprising:
a sensor magnet, having a plurality of magnetic poles provided side-by side in a circumferential direction about the central axis and installed to the rotation body;
a magnetic sensor, overlapped with the sensor magnet when viewed in a predetermined first direction and capable of detecting a magnetic field of the sensor magnet; and
a pair of magnetic parts, provided to sandwich the magnetic sensor in a second direction intersecting the first direction,
wherein the first direction and the second direction are directions orthogonal to each other,
wherein the first direction is an axial direction of the central axis, and the second direction is the circumferential direction about the central axis.

### Claim 2 (depends on 1)

The rotation angle detecting device as claimed in claim 1, further comprising a cover made of resin,
wherein the magnetic sensor is embedded into the cover to be covered.

### Claim 3 (depends on 2)

The rotation angle detecting device as claimed in claim 2, wherein the cover supports the magnetic parts.

### Claim 4 (depends on 1)

The rotation angle detecting device as claimed in claim 1, wherein the magnetic sensor is a Hall element.

### Claim 5 (depends on 1)

The rotation angle detecting device as claimed in claim 1, wherein the pair of magnetic parts are each in a shape in which, when viewed in a third direction orthogonal to both the first direction and the second direction, among four corners of a rectangle, a corner positioned on a side opposite to a side where the sensor magnet is positioned in the first direction and a side opposite to a side where the magnetic sensor is positioned in the second direction is cut off from the rectangle.

### Claim 6 (depends on 1)

An electric actuator, comprising the rotation angle detecting device as claimed in claim 1.

### Claim 7 (depends on 6)

The electric actuator as claimed in claim 6, comprising: a motor;
a deceleration mechanism, connected to the motor; and
an outputter, transmitting rotation of the motor via the deceleration mechanism,
wherein the rotation angle detecting device is capable of detecting a rotation angle of the outputter.