Encoder and motor using same

Patent metadata

Field	Value
Publication number	US-11128202-B2
Application number	US-201916387256-A
Country	US
Kind code	B2
Filing date	Apr 17, 2019
Priority date	Aug 27, 2018
Publication date	Sep 21, 2021
Grant date	Sep 21, 2021

Abstract

An encoder includes a carrier disc, a coded disc, a rotating shaft, a bearing, a bracket, a housing and a sensing assembly is disclosed. The coded disc is disposed on the carrier disc. The rotating shaft includes a first attaching portion and a second attaching portion, and the first attaching portion is partially penetrated through the carrier disc. The bearing includes a bearing inner surface and a bearing outer surface, and the bearing inner surface is connected with the second attaching portion. The bracket includes a bearing attaching portion and a bracket curved feature portion, and the bearing attaching portion is connected with the bearing outer surface. The housing includes a housing curved feature portion, which is connected with the bracket curved feature portion.

First claim

What is claimed is:

1. An encoder, comprising:
a carrier disc;
an optical coded disc disposed on the carrier disc;
a rotating shaft having a first attaching portion and a second attaching portion, wherein the first attaching portion is partially penetrated through the carrier disc;
a first bearing having a first bearing inner surface and a first bearing outer surface, wherein the first bearing inner surface is connected with the second attaching portion of the rotating shaft;
a bracket having a bearing attaching portion and a bracket curved feature portion, wherein the bearing attaching portion is connected with the first bearing outer surface of the first bearing;
a housing having a housing curved feature portion, wherein through the housing curved feature portion, the housing connects to the bracket through a connection between the housing curved feature portion and the bracket curved feature;
a circuit board disposed on the housing and opposite to the optical coded disc;
an optical sensing assembly disposed on the circuit board and paired with the optical coded disc to perform optical sensing; and
a locking element, wherein the locking element is penetrated through the circuit board, the housing and the bracket, such that the circuit board and the housing are fixed to the bracket;
wherein the carrier disc, the rotating shaft, the first bearing and the bracket are structurally coaxial about a rotation center axis, wherein the bracket and the bracket curved feature portion are integrated, the bracket curved feature portion comprises a plurality of curved surface sections which are disconnected from each other, and the housing curved feature portion and the curved surface sections are matched to each other, wherein each of the plurality of curved surface sections is an extending portion extended from a side of the bracket facing the housing and which connects to the housing curved feature portion.

2. The encoder according to claim 1 , wherein the carrier disc has a carrier disc curved feature portion, and through the carrier disc curved feature portion, the carrier disc is connected with the first attaching portion of the rotating shaft and matched with the rotating shaft.

3. The encoder according to claim 1 , wherein the bracket curved feature portion is at an inner edge of the housing curved feature portion.

4. The encoder according to claim 1 , wherein the bracket curved feature portion is at an outer edge of the housing curved feature portion.

5. The encoder according to claim 1 further comprising a magnet and a magnetic sensing assembly, wherein the magnet is disposed on the carrier disc, the optical coded disc is disposed so as to surround the magnet, and the magnetic sensing assembly is disposed on the circuit board and paired with the magnet to perform magnet sensing.

6. The encoder according to claim 5 , wherein center of the magnetic sensing assembly is on the rotation center axis.

7. The encoder according to claim 5 , wherein center of the magnetic sensing assembly is offset from the rotation center axis.

8. The encoder according to claim 1 , wherein the optical coded disc has an incremental pattern track, and the incremental pattern track has a plurality of incremental patterns arranged along a circumferential direction of the optical coded disc.

9. The encoder according to claim 1 , wherein the optical sensing assembly comprises a substrate, a light-emitting element and a light-receiving element, wherein the substrate is disposed on the circuit board, the light-receiving element is disposed on the substrate, and the light-emitting element is disposed on the light-receiving element.

10. The encoder according to claim 1 further comprising a locking element, wherein the locking element is penetrated through the carrier disc and the rotating shaft, such that the carrier disc is fixed to the rotating shaft.

11. The encoder according to claim 1 further comprising a second bearing, wherein the second bearing has a second bearing inner surface and a second bearing outer surface, wherein the second bearing inner surface is connected with the second attaching portion of the rotating shaft, and the second bearing outer surface is connected with the bearing attaching portion of the bracket.

12. A motor, comprising:
an encoder, comprising:
a carrier disc;
a coded disc disposed on the carrier disc;
a rotating shaft having a first attaching portion and a second attaching portion, wherein the first attaching portion is partially penetrated through the carrier disc;
a bearing having a bearing inner surface and a bearing outer surface, wherein the bearing inner surface is connected with the second attaching portion of the rotating shaft;
a first bracket having a bearing attaching portion and a bracket curved feature portion, wherein the bearing attaching portion is connected with the bearing outer surface of the bearing;
a housing having a housing curved feature portion, wherein through the housing curved feature portion, the housing connects to the bracket through a connection between the housing curved feature portion and the bracket curved feature;
a circuit board disposed on the housing and opposite to the coded disc;
a locking element, wherein the locking element is penetrated through the circuit board, the housing and the bracket, such that the circuit board and the housing are fixed to the bracket; and
a sensing assembly disposed on the circuit board and paired with the coded disc to perform sensing;

a motor bearing having a motor bearing inner surface and a motor bearing outer surface, wherein the motor bearing inner surface is connected with the rotating shaft;
a second bracket connected with the motor bearing outer surface of the motor bearing;
a casing connected with the first bracket and the second bracket;
a rotor portion disposed in the casing, wherein the rotor portion surrounds the rotating shaft; and
a stator portion disposed in the casing and paired with the rotor portion,
wherein the carrier disc, the rotating shaft, the bearing, the first bracket, the motor bearing and the second bracket are structurally coaxial about a rotation center axis, wherein the bracket and the bracket curved feature portion are integrated, the bracket curved feature portion comprises a plurality of curved surface sections which are disconnected from each other, and the housing curved feature portion and the curved surface sections are matched to each other, wherein each of the plurality of curved surface sections is an extending portion extended from a side of the bracket facing the housing and which connects to the housing curved feature portion.

Assignees

• Delta Electronics Inc

Inventors

• Wang Horng-Jou
• Tsai Ming-Tien

Classifications

• H02K11/215

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

• G01D5/34707 Primary

  Scales; Discs, e.g. fixation, fabrication, compensation · CPC title

• G01D5/3473

  Circular or rotary encoders · CPC title

• H02K5/16

  Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields (magnetic bearings H02K7/09) · CPC title

• H02K11/22 Primary

  Optical devices · CPC title