Sensor assembly and motor including the same

Patent metadata

Field	Value
Publication number	US-10396634-B2
Application number	US-201615225128-A
Country	US
Kind code	B2
Filing date	Aug 1, 2016
Priority date	Aug 5, 2015
Publication date	Aug 27, 2019
Grant date	Aug 27, 2019

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 side surface and a bottom surface;
a first insertion groove formed in the bottom surface of the holder;
a sensing magnet disposed in the first insertion groove, a bottom surface of the sensing magnet extending below the bottom surface of the holder; and
a sensor cap configured to cover the sensing magnet, the sensor cap having a bottom portion contacting the bottom surface of the sensing magnet, and a side portion extending over and fixed to the side surface of the holder.

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

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

4. The sensor assembly of claim 1 , wherein the holder includes a recessed groove formed in a circumferential direction, and
wherein a fastening portion of the side portion of the sensor cap engages the recessed groove to fix the sensor cap to the holder.

5. The sensor assembly of claim 1 , wherein the holder includes a ring-shaped wing portion configured to protrude in a radial direction from the side surface of the holder, and
wherein a diameter of the wing portion is 1.2 to 2.0 times a diameter of the holder.

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 bottom portion of the sensor cap directly contacts the bottom surface of the sensing magnet.

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

9. The sensor assembly of claim 1 , 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.

10. The sensor assembly of claim 1 , wherein the sensor cap includes a plurality of protrusions formed at the bottom portion.

11. The sensor assembly of claim 1 , wherein the sensor cap includes a central hole formed at a center of the bottom portion and a plurality of sub-holes formed at an outside of the bottom portion.

12. The sensor assembly of claim 1 , further comprising:
grooves formed in a bottom surface of the first insertion groove; and
adhesive on the bottom surface of the first insertion groove,
wherein a top surface of the sensing magnet contacts the adhesive to retain the sensing magnet in the first insertion groove.

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 side surface and a bottom surface;
a first insertion groove formed in the bottom surface of the holder;
a sensing magnet disposed at the first insertion groove, a bottom surface of the sensing magnet extending below the bottom surface of the holder; and
a sensor cap configured to cover the sensing magnet, the sensor cap having a bottom portion contacting the bottom surface of the sensing magnet, and a side portion extending over and fixed to the side surface of the holder.

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

15. The motor of claim 14 , wherein the detection unit includes a magnetic element configured to face the 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 a top surface of the holder, and the second insertion groove is coupled to the rotation shaft of the motor.

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

18. The motor of claim 13 , wherein the holder includes a recessed groove formed in a circumferential direction, and
wherein a fastening portion of the side portion of the sensor cap engages the recessed groove to fix the sensor cap to the holder.

19. The motor of claim 13 , wherein the holder includes a ring-shaped wing portion configured to protrude in a radial direction from the side surface of the holder, and
wherein a diameter of the wing portion is 1.2 to 2.0 times a diameter of the holder.

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

• G01D11/30

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

• G01D5/145

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

• H02K29/08 Primary

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