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Axial power slip ring arrangement

IP.com Disclosure Number: IPCOM000248942D
Publication Date: 2017-Jan-24
Document File: 5 page(s) / 193K

Publishing Venue

The IP.com Prior Art Database

Related People

Wilander Ben: AUTHOR [+2]

Abstract

An axial slip ring arrangement in which the brushes act in the axial direction on a rotating power slip ring formed as a disc is disclosed. The axially directed brushes may be positioned near the axial center line, which means that the surface speed at the axial brush is smaller compared to the surface speed of a radial brush acting on the outer circular surface of a power slip ring. The impact of vibrations is thus smaller in the contact point between the axial brush and the power slip ring. It is also possible to increase the pressure of the axial brushes due to the lower surface speed compared to radial brushes.

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Page 1 of 5  FI-1413701

© Copyright [2017] ABB. All rights reserved.

AXIAL POWER SLIP RING ARRANGEMENT

Prior art power slip ring arrangements are normally based on radial brushes acting on

circular power slip rings.

Figure 1. Radial slip ring arrangement.

Figure 1 shows a traditional prior art power slip ring arrangement in which the brushes

are in contact with the circular rotating power slip ring. There is a rather big distance

from the axial center line to the contact point of the brushes. Vibrations are a problem in

the contact surface between the brush and the power slip ring.

Figure 2. Axial slip ring arrangement.

Figure 2 shows an axial slip ring arrangement in which the brushes act in the axial di-

rection on a rotating power slip ring formed as a disc. The axially directed brushes may

be positioned near the axial center line, which means that the surface speed at the axial

brush is smaller compared to the surface speed of a radial brush acting on the outer cir-

Page 2 of 5  FI-1413701

© Copyright [2017] ABB. All rights reserved.

cular surface of a power slip ring i.e. far away from the axial center line of the power slip

ring.

The impact of vibrations is thus smaller in the contact point between the axial brush and

the power slip ring. This is true at least in the inner power slip ring. It is also possible to

increase the pressure of the axial brushes due to the lower surface speed compared to

radial brushes. The contact surface of an axial brush with the power slip rings is straight

whereas it is curved in a radial brush. Especially movements in the side direction

caused by vibrations have a negative impact on the contact of the radial brushes caus-

ing the radial brushes to bounce.

Grooves are also sometimes used in the power slip rings in prior art solutions using ra-

dial brushes. This means that axial vibrations may easily move the brushes and thereby

damage the brushes due to lack of continuous contact....