# US 10,320,261 B2 · Rotor alignment for reducing vibrations and noise

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- Number: US 10,320,261 B2
- Document ID: US10320261B2
- Status: Granted
- Kind: B2
- Application number: 15/377,117
- Filed: 2016-12-13
- Published: 2017-06-15
- Granted: 2019-06-11
- Earliest claimed: 2015-12-14
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: Klaus Büttner; Klaus Kirchner; Matthias Warmuth; Norbert Wöhner
- Web page: https://patentgrep.com/patent/US10320261B2

## CPC

- H02K 5/15: Mounting arrangements for bearing-shields or end plates
- H02K 5/24: specially adapted for suppression or reduction of noise or vibrations
- H02K 7/09: with magnetic bearings
- H02K 15/165: Balancing the rotors
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

For reducing vibrations and noise in electrical machines a rotor is mounted in a magnetic alignment device while a bearing shield is loosely held relative to a stator. The rotor is driven by the stator and vibrations of the rotor are detected. A magnetic alignment device is controlled so as to reduce the vibrations. Finally the bearing shield is fixed to the stator in a position determined by the controlling of the magnetic alignment device. Thus electromagnetic forces are taken into consideration during vibration and noise reduction.

## Claims

### Claim 1

A method for mounting a rotor in a stator of an electrical machine, comprising:
mounting the rotor in a magnetic alignment device, while a bearing shield, to which at least one rolling bearing for support of the rotor is fastened, is loosely held in relation to the stator;
driving the rotor by the stator;
detecting first vibrations of the rotor;
controlling the magnetic alignment device such as to reduce the first vibrations; and
fixing the bearing shield to the stator in a position determined by the controlling of the magnetic alignment device.

### Claim 2 (depends on 1)

The method of claim 1, further comprising detecting second vibrations of a housing of the electrical machine; and controlling the magnetic alignment device also in response to the second vibrations.

### Claim 3 (depends on 1)

The method of claim 1, further comprising fixing the bearing shield to the stator via a housing of the electrical machine.

### Claim 4 (depends on 3)

The method of claim 3, further comprising:
mounting a centering portion to a front face of the housing for displacement in relation to a remaining part of the housing perpendicular to an axis of the rotor; and
fixedly connecting the centering portion to the remaining part of the housing as the bearing shield is fixed to the stator.

### Claim 5 (depends on 3)

The method of claim 3, further comprising:
fixedly connecting a centering portion to a front face of the housing;
mounting the bearing shield to the centering portion for displacement in a direction perpendicular to the axis of the rotor; and
fixedly connecting the centering portion to the bearing shield as the bearing shield is fixed to the stator.

### Claim 6 (depends on 1)

The method of claim 1, further comprising limiting a radial displacement of the rotor relative to the stator to a predetermined maximum value during the controlling of the magnetic alignment device.

### Claim 7 (depends on 3)

The method of claim 3, further comprising limiting a radial displacement of the rotor relative to the stator by a predetermined maximum clearance of the bearing shield relative to the housing.

### Claim 8

A mounting system for mounting a rotor in a stator of an electrical machine, comprising:
a magnetic alignment device for mounting the rotor in a rolling bearing;
an activation device configured to activate the rotor by the stator;
a sensor device configured to detect vibrations of the rotor in an operating state in which the rotor is driven by the stator; and
a control device configured to control the magnetic alignment device such as to reduce the vibrations.

### Claim 9 (depends on 8)

The mounting system of claim 8, wherein the magnetic alignment device includes a first magnetic bearing device and a second magnetic bearing device, the first magnetic bearing device being mounted radially with one end of a shaft of the rotor, and the second magnetic bearing device being mounted radially with another end of the shaft of the rotor.

### Claim 10 (depends on 9)

The mounting system of claim 9, wherein the first magnetic bearing device includes a magnetic axial bearing.