Method for producing a corona shield, fast-curing corona shield system, and electric machine

Patent metadata

Field	Value
Publication number	US-10186924-B2
Application number	US-201114365158-A
Country	US
Kind code	B2
Filing date	Dec 15, 2011
Priority date	Dec 15, 2011
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

The corona shield can be applied in electric machines in a faster manner by using radiation-cured materials.

First claim

The invention claimed is:

1. A corona shield for electric machines, comprising: a varnish having a thickness in the range of 0.5 mm-1 mm that includes a UV-cured matrix material comprising cross-linked molecules, and an electrically semiconducting filler.

2. The corona shield as claimed in claim 1 , wherein a proportion of the semiconducting filler in the shield is 30% by weight to 90% by weight.

3. The corona shield as claimed in claim 1 , wherein the corona shield is further comprised of an electromagnetic radiation-cured material made of a curable material from a group consisting of bisphenol A diglycidyl ether (BADGE), bisphenol F diglycidyl ether (BFDGE), 3,4-epoxycyclohexylmethyl-3′,4′-epoxy-cyclohexane carboxylate, phenol novolak, acrylate, urethane, and end ether.

4. An electric machine which includes a corona shield as claimed in claim 1 .

5. The electric machine as in claim 4 , wherein the machine is a generator.

6. A corona shield for electric machines, comprising: a varnish that includes a UV-cured matrix material comprising cross-linked molecules, and an electrically semiconducting filler, wherein the electrically semiconducting filler comprises at least one of silicon carbide and graphite.

7. A corona shield for electric machines, comprising: a varnish that includes a UV-cured matrix material comprising cross-linked molecules, and an electrically semiconducting filler, wherein the corona shield further comprises a heat-cured material.

8. The corona shield as claimed in claim 7 , wherein the heat-cured material comprises cross-linked molecules.

Assignees

• Brockschmidt Mario
• Kempen Stefan
• Pohlmann Friedhelm
• Schmidt Guido
• Siemens Ag

Inventors

• Brockschmidt Mario
• Kempen Stefan
• Pohlmann Friedhelm
• Schmidt Guido

Classifications

• H01B3/004 Primary

  with conductive additives or conductive layers · CPC title

• H02K15/105

  to the windings · CPC title

• H02K3/40 Primary

  for high voltage, e.g. affording protection against corona discharges · CPC title

• H02K15/12

  Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines · CPC title

• H02K9/18

  wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing · CPC title