Sensor assembly and motor including the same

Patent metadata

Field	Value
Publication number	US-2017040874-A1
Application number	US-201615225128-A
Country	US
Kind code	A1
Filing date	Aug 1, 2016
Priority date	Aug 5, 2015
Publication date	Feb 9, 2017
Grant date	—

Abstract

Disclosed herein are a sensor assembly including a holder that includes a first insertion groove formed at one side and a second insertion groove formed at the other side, a sensing magnet disposed at the first insertion groove, and a sensor cap that covers the sensing magnet, and a motor including the same.

First claim

What is claimed is:

1 . A sensor assembly comprising
a holder including a first insertion groove formed at one side; a sensing magnet disposed in the first insertion groove; and a sensor cap configured to cover the sensing magnet.

2 . The sensor assembly of claim 1 , wherein the holder includes a second insertion groove formed at the other side, and the second insertion groove serves to be coupled to a rotation shaft of a motor.

3 . The sensor assembly of claim 1 , wherein the depth of the first insertion groove is smaller than the thickness of the sensing magnet.

4 . The sensor assembly of claim 1 , wherein the holder includes a recessed groove formed in a circumferential direction.

5 . The sensor assembly of claim 1 , wherein the holder includes a ring-shaped wing portion configured to protrude in a radial direction.

6 . The sensor assembly of claim 1 , wherein the holder and the sensor cap include a nonmagnetic material.

7 . The sensor assembly of claim 1 , wherein the sensor cap includes a bottom portion configured to come into contact with one surface of the sensing magnet and a side portion configured to be coupled to a side surface of the holder.

8 . The sensor assembly of claim 7 , wherein the sensor cap includes a fastening portion formed at the side portion to be coupled to the holder.

9 . The sensor assembly of claim 1 , wherein the thickness of the sensor cap is 0.05 mm to 0.3 mm.

10 . The sensor assembly of claim 7 , wherein the sensor cap includes a connection portion configured to connect the bottom portion and the side portion to each other, and the connection portion has a curvature.

11 . The sensor assembly of claim 7 , wherein the sensor cap includes a plurality of protrusions formed at the bottom portion.

12 . The sensor assembly of claim 7 , wherein the sensor cap includes a central hole formed at the center of the bottom portion and a plurality of sub-holes formed at an outside of the bottom portion.

13 . A motor comprising:
a rotation shaft; a rotor including a hole into which the rotation shaft is inserted; a stator disposed along an outer perimeter of the rotor; a housing configured to accommodate the rotor and the stator; and a sensor assembly configured to detect a rotation of the rotor, wherein the sensor assembly includes: a holder including a first insertion groove formed at one side; a sensing magnet disposed at the first insertion groove; and a sensor cap configured to cover the sensing magnet.

14 . The motor of claim 13 , further comprising a detection unit configured to sense a rotation of the sensing magnet. 10

15 . The motor of claim 14 , wherein the detection unit includes a magnetic element configured to face a bottom portion of the sensor cap, and a printed circuit board on which the magnetic element is disposed.

16 . The motor of claim 13 , wherein the holder includes a second insertion groove formed at the other side, and the second insertion groove serves to be coupled to the rotation shaft of the motor.

17 . The motor of claim 13 , wherein the depth of the first insertion groove is smaller than the thickness of the sensing magnet.

18 . The motor of claim 13 , wherein the holder includes a recessed groove formed in a circumferential direction.

19 . The motor of claim 13 , wherein the holder includes a ring-shaped wing portion configured to protrude in a radial direction.

20 . The motor of claim 13 , wherein the holder and the sensor cap include a nonmagnetic material.

Assignees

• Lg Innotek Co Ltd

Inventors

• Han Cheong Un

Classifications

• G01D5/145

  influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06) · CPC title

• G01D11/30

  Supports specially adapted for an instrument; Supports specially adapted for a set of instruments · CPC title

• H02K11/215 Primary

  Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements · CPC title

• G01D11/245

  Housings for sensors · CPC title

• H02K29/08 Primary

  using magnetic effect devices, e.g. Hall-plates, magneto-resistors (H02K29/12 takes precedence) · CPC title