Center error value of bearings measuring method

Patent metadata

Field	Value
Publication number	US-10480922-B2
Application number	US-201715615064-A
Country	US
Kind code	B2
Filing date	Jun 6, 2017
Priority date	Jul 25, 2016
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A method of measuring a center error between bearings includes disposing both sides of a rotation shaft on inner circumferential surfaces of a magnetic bearing and a backup bearing, applying current to the magnetic bearing to produce movement of the rotation shaft, determining a contact point between the rotation shaft and the backup bearing according to movement of the rotation shaft, determining a final target value using the contact point and predetermined position information of the magnetic bearing, determining a magnetic center of the magnetic bearing through the final target value, comparing the magnetic center of the magnetic bearing and a mechanical center of the backup bearing to determine a center error, and aligning the magnetic center of the magnetic bearing and the mechanical center of the backup bearing based on the determined center error.

First claim

What is claimed is:

1. A method of measuring a center error between bearings, the method comprising:
disposing both sides of a rotation shaft on inner circumferential surfaces of a magnetic bearing and a backup bearing;
applying current to the magnetic bearing to produce movement of the rotation shaft;
determining a contact point between the rotation shaft and the backup bearing according to movement of the rotation shaft;
determining a final target value using the contact point and predetermined position information of the magnetic bearing;
determining a magnetic center of the magnetic bearing through the final target value;
comparing the magnetic center of the magnetic bearing and a mechanical center of the backup bearing to determine a center error; and
aligning the magnetic center of the magnetic bearing and the mechanical center of the backup bearing based on the determined center error.

2. The method according to claim 1 , wherein the predetermined position is a predicted value of the magnetic center.

3. The method according to claim 2 , wherein the applying of current includes applying current to a plurality of positions of the magnetic bearing to produce movement of the rotation shaft plural times.

4. The method according to claim 3 , wherein the determining the contact point includes forming a plurality of contact points as the rotation shaft moves plural times.

5. The method according to claim 4 , wherein the determining of the final target value includes:
determining a plurality of target values according to the plurality of contact points, and
determining a sum of the plurality of determined target values as a final target value.

6. The method according to claim 2 , wherein, in the determining of the final target value, the predetermined position information includes a plurality of pieces of position information.

7. The method according to claim 6 , wherein the determining of the final target value includes determining a plurality of target values with respect to the plurality of pieces of position information.

8. The method according to claim 7 , wherein the determining of the final target value further includes determining a target value having a minimum value among the plurality of target values as the final target value.

9. The method according to claim 1 , wherein the determining of the center error includes comparing measured coordinate values of the magnetic center of the magnetic bearing and measured coordinate values of the mechanical center.

Assignees

• Lg Electronics Inc
• The Industry & Academic Cooperation In Chungnam National Univ

Inventors

• Lee Namsoo
• NOH Myounggyu
• Kim Soyoon
• JANG Seongmin
• Jeong Jinhee
• Baek Seongki
• Nam Sunggyu

Classifications

• F16C2362/52

  Compressors of refrigerators, e.g. air-conditioners · CPC title

• F16C32/0451

  Details of controllers, i.e. the units determining the power to be supplied, e.g. comparing elements, feedback arrangements with P.I.D. control · CPC title

• G01M13/04 Primary

  Bearings · CPC title

• G01B5/146

  measuring play on bearings · CPC title

• G01B21/24

  for testing alignment of axes · CPC title