Sensor module and motor comprising same

Patent metadata

Field	Value
Publication number	US-2016349079-A1
Application number	US-201515115216-A
Country	US
Kind code	A1
Filing date	Jan 29, 2015
Priority date	Jan 29, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

Disclosed is a sensor module, comprising: a protrusion part of a polygonal shape formed at one side; a sensing plate including a first insertion hole, formed in the protrusion part, to which a rotational shaft is coupled; and a sensing magnet including a second insertion hole, formed to correspond to the polygonal shape, in which the protrusion part is inserted and fixed.

First claim

1 . A sensor module rotated in conjunction with a rotating shaft to detect a rotor position, the sensor module comprising:
a sensing plate including a protrusion part formed at one side in a polygonal shape, and a first insertion hole formed at the protrusion part; and a sensing magnet including a second insertion hole formed to correspond to the polygonal shape for the protrusion part to be fixedly inserted therein.

2 . The sensor module of claim 1 , wherein:
the sensing magnet in which the second insertion hole is formed in the center includes a main magnet which has an inner side surface in a polygonal shape; and the main magnet includes a plurality of segmented magnets having identical areas.

3 . The sensor module of claim 2 , wherein the plurality of segmented magnets are formed to be symmetrical with respect to facing surfaces facing each other.

4 . The sensor module of claim 2 , wherein a width of the plurality of segmented magnets between an outer side surface and an inner side surface changes in a circumferential direction.

5 . The sensor module of claim 1 , wherein a corner of the polygonal shape has curvature.

6 . The sensor module of claim 2 , wherein the sensing magnet includes a plurality of sub-magnets disposed at edges.

7 . The sensor module of claim 1 , comprising a magnetic device which detects a change in magnetic flux according to rotation of the sensing magnet.

8 . A motor comprising:
a housing; a stator disposed in the housing; a rotor rotatably disposed in the stator; a rotating shaft rotating in conjunction with the rotor; and the sensor module according to claim 1 .

9 . The motor of claim 8 , wherein:
the sensing magnet in which the second insertion hole is formed in the center includes a main magnet which has an inner side surface in a polygonal shape; and the main magnet includes a plurality of segmented magnets having identical areas.

10 . The motor of claim 9 , wherein the plurality of segmented magnets are formed to be symmetrical with respect to facing surfaces facing each other.

11 . The motor of claim 9 , wherein a width of the plurality of segmented magnets between an outer side surface and an inner side surface changes in a circumferential direction.

12 . The motor of claim 8 , wherein a corner of the polygonal shape has curvature.

13 . The motor of claim 9 , wherein the sensing magnet includes a plurality of sub-magnets disposed at edges.

14 . The motor of claim 8 , further comprising a magnetic device which detects a change in magnetic flux according to rotation of the sensing magnet.

Assignees

• Lg Innotek Co Ltd

Inventors

• Seo Ja Young

Classifications

• G01D5/2451

  Incremental encoders (G01D5/2454 takes precedence) · CPC title

• H02K11/215

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

• G01D5/12 Primary

  using electric or magnetic means (G01D5/06 takes precedence) · CPC title

• G01D5/24442 Primary

  by mounting means · CPC title