Reduction of electrolytic corrosion in a brushless direct-current motor

Patent metadata

Field	Value
Publication number	US-9742233-B2
Application number	US-201214366738-A
Country	US
Kind code	B2
Filing date	Dec 11, 2012
Priority date	Dec 21, 2011
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

The invention relates to a control device ( 1 ) for reducing electrolytic corrosion in a brushless direct-current motor ( 3 ). The control device ( 1 ) is designed to control phases ( 9, 11, 13 ) of the brushless direct-current motor ( 3 ). The control device ( 1 ) has a potential equalization connection ( 5 ) and a potential equalization line ( 7 ). The potential equalization line ( 7 ) is designed to connect the brushless direct-current motor ( 3 ) to the potential equalization connection ( 5 ). An anti-corrosion resistor (R K ) is provided on the potential equalization line ( 7 ), which anti-corrosion resistor is designed to reduce a current flow between the phases ( 9, 11, 13 ) of the brushless direct-current motor ( 3 ) and the potential equalization line ( 7 ).

First claim

The invention claimed is:

1. A control device ( 1 ) for reducing electrolytic corrosion in a brushless direct-current motor ( 3 ), the control device ( 1 ) having a potential equalization connection ( 5 );
a potential equalization line ( 7 ) which is configured to connect a brushless direct-current motor ( 3 ) to the potential equalization connection ( 5 );
wherein the control device ( 1 ) is designed to actuate phases ( 9 , 11 , 13 ) of the brushless direct-current motor ( 3 );
characterized in that
an anticorrosion resistance (R K ) is provided on the potential equalization line ( 7 ), which anti-corrosion resistance (R K ) is designed to reduce a flow of current between the phases ( 9 , 11 , 13 ) of the brushless direct-current motor ( 3 ) and the potential equalization line.

2. The control device ( 1 ) as claimed in claim 1 ,
wherein the potential equalization line ( 7 ) has a line resistance (R L );
wherein the anti-corrosion resistance (R K ) is larger than the line resistance (R L ).

3. The control device ( 1 ) as claimed in claim 1 ,
wherein the anti-corrosion resistance (R K ) is in a range between 100 kilo-ohms and one mega-ohm.

4. The control device ( 1 ) as claimed in claim 1 ,
also having a capacitor (C) which is connected in parallel with the anti-corrosion resistance (R K ) in such a way that a high-frequency interference signal is extracted from the potential equalization line ( 7 ).

5. A system ( 25 ) for reducing electrolytic corrosion in a brushless direct-current motor ( 3 ), the system ( 25 ) having a control device ( 1 ) as claimed in claim 1 , further comprising
an electric feed pump ( 15 ) into which the brushless direct-current motor ( 3 ) is integrated;
wherein a potential equalization line ( 7 ) connects the electric feed pump ( 15 ) to the potential equalization connection ( 5 ).

6. A method for manufacturing a control device ( 1 ) as claimed in claim 1 , the method comprising:
provision of a control device ( 1 ) which is designed to actuate phases ( 9 , 11 , 13 ) of a brushless direct-current motor ( 3 );
provision of a potential equalization connection ( 5 ) on the control device ( 1 );
provision of a potential equalization line ( 7 ) which is configured to connect the brushless direct-current motor ( 3 ) to the potential equalization connection ( 5 );
characterized in that the method also has
provision of an anti-corrosion resistance (R K ) on the potential equalization line ( 7 );
wherein the anti-corrosion resistance (R K ) is designed to reduce a flow of current between the phases ( 9 , 11 , 13 ) of the brushless direct-current motor ( 3 ) and the potential equalization line ( 7 ).

7. The system ( 25 ) as claimed in claim 5 ,
wherein an electrically conductive feeding medium ( 17 ) of the electric feed pump ( 15 ) has a feeding medium resistance (R F ) between the phases ( 9 , 11 , 13 ) and the potential equalization line ( 7 );
wherein the anti-corrosion resistance (R K ) is connected in series with the feeding medium resistance (R F ).

8. The system ( 25 ) as claimed in claim 5 ,
wherein the anti-corrosion resistance (R K ) is arranged in the control device ( 1 ).

9. The system ( 25 ) as claimed in claim 5 ,
wherein the electric feed pump ( 15 ) is an electric fuel pump.

10. The system ( 25 ) as claimed in claim 5 ,
wherein the anti-corrosion resistance (R K ) is arranged on a flange ( 23 ) between the electric feed pump (R F ) and the control device ( 1 ).

Assignees

• Bosch Gmbh Robert

Inventors

• Immendoerfer Ingo
• Ruedinger Stefan
• Matzke Markus

Classifications

• C23F13/04 Primary

  Controlling or regulating desired parameters · CPC title

• H02P6/34

  Modelling or simulation for control purposes · CPC title

• H02K3/44 Primary

  Protection against moisture or chemical attack; Windings specially adapted for operation in liquid or gas · CPC title

• C23F13/06

  Constructional parts, or assemblies of cathodic-protection apparatus · CPC title