# US 10,480,922 B2 · Center error value of bearings measuring method

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- Number: US 10,480,922 B2
- Document ID: US10480922B2
- Status: Granted
- Kind: B2
- Application number: 15/615,064
- Filed: 2017-06-06
- Published: 2018-01-25
- Granted: 2019-11-19
- Earliest claimed: 2016-07-25
- Assignees: LG Electronics Inc.; The Industry & Academic Cooperation in Chungnam National University
- Applicants: LG Electronics Inc.; The Industry & Academic Cooperation In Chungnam National University
- Inventors: Namsoo Lee; Myounggyu Noh; Soyoon Kim; Seongmin Jang; Jinhee Jeong; Seongki Baek; Sunggyu Nam
- Web page: https://patentgrep.com/patent/US10480922B2

## CPC

- G01B 5/14: for measuring distance or clearance between spaced objects or spaced apertures (G01B5/24 takes precedence)
- F16C 32/0446: {Determination of the actual position of the moving member, e.g. details of sensors}
- F16C 32/0451: {Details of controllers, i.e. the units determining the power to be supplied, e.g. comparing elements, feedback arrangements with P.I.D. control}
- G01B 5/146: {measuring play on bearings}
- G01M 13/04: Bearings
- F16C 2362/52: Compressors of refrigerators, e.g. air-conditioners
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 2)

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.

### Claim 4 (depends on 3)

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.

### Claim 5 (depends on 4)

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.

### Claim 6 (depends on 2)

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.

### Claim 7 (depends on 6)

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.

### Claim 8 (depends on 7)

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.

### Claim 9 (depends on 1)

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.