# US 2017/0288488 A1 · Corona Shielding System For An Electrical Machine

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- Number: US 2017/0288488 A1
- Document ID: US20170288488A1
- Status: Published application
- Kind: A1
- Application number: 15/511,344
- Filed: 2015-08-03
- Published: 2017-10-05
- Earliest claimed: 2014-09-25
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: Bernhard Klaussner; Jiri Lang; Steffen Lang; Alexander Litinsky; Guido Schmidt; Christian Schulz-Drost; Klaus Schaefer; Christian Staubach
- Web page: https://patentgrep.com/patent/US20170288488A1

## CPC

- H02K 3/40: for high voltage, e.g. affording protection against corona discharges
- H01B 1/20: Conductive material dispersed in non-conductive organic material {(organic macromolecular compounds or compositions C08)}
- H01B 3/04: mica
- H02K 3/30: Windings characterised by the insulating material
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})

## Abstract

The present disclosure relates to electrical machines. The teachings thereof may be embodied in a corona shielding system, especially an outer corona shielding system, for an electrical machine. For example, a corona shielding system may include: a polymeric matrix; particles disposed in the matrix, including a mica-coated core and a layer of metal oxide disposed on the core; and a surface functionalization material disposed on a surface of the particles for binding to the matrix.

## Claims

### Claim 1

A corona shielding system for an electrical machine, the system comprising:
a polymeric matrix;
particles disposed in the polymeric matrix, the particles comprising a mica-coated core and a layer formed by a metal oxide disposed on the core; and
a surface functionalization material disposed on a surface of the particles for binding to the matrix.

### Claim 2 (depends on 1)

The corona shielding system as claimed in claim 1, wherein the metal oxide comprises tin oxide.

### Claim 3 (depends on 1)

The corona shielding system as claimed in claim 1, wherein the polymeric matrix comprise plastic or resin.

### Claim 4 (depends on 1)

The corona shielding system as claimed in claim 1, wherein the surface functionalization material comprises a molecule covalently bonded to the metal oxide or the polymeric matrix.

### Claim 5 (depends on 1)

The corona shielding system as claimed in claim 1, wherein the surface functionalization material comprises an oligomeric structure.

### Claim 6 (depends on 1)

The corona shielding system as claimed in claim 1, wherein the surface functionalization material comprises a polymeric structure.

### Claim 7 (depends on 1)

The corona shielding system as claimed in claim 1, wherein the surface functionalization material comprises:
a first component disposed far from the mica-coated core; and
a second component disposed close to the mica-coated core;
wherein the first component is formed with lower electrical polarity than the second component or the mica-coated core.

### Claim 8

An electrical machine comprising:
a high-voltage machine;
and corona shielding system comprising:
a polymeric matrix;
particles disposed in the polymeric matrix, the particles comprising a mica-coated core and a layer formed by a metal oxide disposed on the core; and
a surface functionalization material disposed on a surface of the particles for binding to the matrix.