FIELD OF THE INVENTION
The present invention relates to systems and methods for carbon dust extraction
from hydro generators, and more particularly to a system and a method for dust
extracting contaminants from synchronous motors.
BACKGROUND OF THE INVENTION
Background description includes information that may be useful in understanding
the present subject matter. It is not an admission that any of the information
provided herein is prior art or relevant to the presently claimed subject matter, or
that any publication specifically or implicitly referenced is prior art.
Rotating electrical devices such as hydro generators and synchronous motors often
utilize wearable, conductive components referred as brushes to transfer electricity
from rotating parts to stationary parts. One example of such rotating electrical
device is the type of synchronous generator used in the power generation industry.
In order to prevent damage from electrical shorts or arcing, equipment operators
are required to frequently inspect and clean the current collection systems of
generators. This daily inspection and cleaning is tedious and time consuming. It
also exposes equipment operators to dangerous high-voltage conditions in and
around the current dust collection system.
Existing methods shows when hydro generators/synchronous motor is running, due
to contact of carbon brush with slip ring, carbon dust falls.

Carbon dust extraction unit consists of an exhaust fan driven by motor enclosed in
a sheet steel cubicle and fitted with reusable bags for collecting the dust. The unit
is provided with filter bags of adequate area and filter shaker. Suitable opening is
provided on the side of the housing for entry of dust-laden air. Suitable airtight
doors on housing are provided for inspection of filter, and removing the dust
collecting bags. The base of the housing is provided with base flanges for floor
mounting / wall mounting.
As an example of the prior art, WO Publication. No: WO2014084632A1 discloses an
electric dust collection device of an electric dust collection system. The electric dust
collection device of the electric dust collection system includes: a flowing liquid
collection unit that collects dust charged by a liquid which flows to one side surface;
and a counter unit that is provided at a position facing the flowing liquid collection
unit and has a metal plate charged with the same polarity as the charged dust so
as to guide the flow of the introduced charged dust to the flowing liquid collection
unit side. The counter unit further includes a coating layer that is formed of an
insulating material so as to coat the metal plate.
Existing prior art such as CN103944321A relates to a generator conductive ring and
dust collection cover structure. A dust collection cover is arranged between a
collecting ring and carbon brushes, space between the collecting ring and the
carbon brushes is sealed through the dust collection cover so that a relatively closed
cavity can be obtained, the carbon brushes are arranged a on brush holder, the
front end of each carbon brush is kept to make contact with the collecting ring, and
the carbon brushes make contact with a conductive ring; a dust suction inlet is
formed in the dust collection cover; the conductive ring made of metal material is

of a circular-ring-shaped structure which is a whole circle structure formed by
connecting a circular ring or two semicircular rings; the carbon brushes are
arranged in the circumferential direction of the conductive ring, and the carbon
brushes are vertically arranged and arranged in pairs. The structure is convenient
to install, and the installing efficiency is remarkably improved; through the
structure, the problem that a center cannot be found easily in the installing process
is effectively solved; currents are evenly distributed, and high temperature caused
by local overlarge current density is avoided; an included angle is formed between
the dust suction inlet and the tangential direction of the conductive ring, carbon
powder can more smoothly pass through the dust suction inlet and enter a dust
suction pipeline, and a good energy-saving and consumption-reducing effect can
be achieved.
Another example CN202602473U disclose a dust multi-stage filtering collecting box
comprises a collecting box. The upper portion of the collecting box is connected
with a collecting ring cover through an extensible hose the lower portion of the
collecting box is fixedly connected with a dust-exhausting pipe fixing frame through
an extensible hose, the upper side and the lower side of an inner cavity of the
collecting box are respectively provided with a filtering plate, two filtering plates
are arranged at the position of the center of the inner cavity of the collecting box,
and a foaming spongy layer is clamped between the two filtering plates. The dust
multi-stage filtering collecting box has the advantages that when a sliding ring and
a carbon brush rub with each other, generated carbon powder is blown into the
carbon powder collecting box through a fan which a generator is provided with, the
carbon powder be collected in the carbon powder collecting box sequentially

through a plurality of layers of filtering plates, and scattering of the carbon powder
is effectively avoided.
Thus, there remains a need for a method and system for extracting the carbon
dust. Also there remains a need for system of collecting carbon dust falling from
carbon brushes to a carbon dust extraction unit through pipes.
OBJECTS OF THE INVENTION
In view of the foregoing limitations inherent in the state of the art, some of the
objects of the present disclosure, which at least one embodiment herein satisfy, are
listed herein below.
It is an object of the present disclosure to propose a system for carbon dust
extraction for hydro generators/synchronous motors with quick assembly of
components.
It is another object of the present disclosure to propose the method and system for
carbon dust extraction which reduce the cleaning time and make the process
simpler and easy at the time of maintenance.
It is yet another object of the present disclosure to propose the method and system
for carbon dust extraction which make the process safer and remove carbon dust
from machine.
It is still yet another object of the present disclosure to propose the method and
system which extract the carbon dust automatically.

These and other objects and advantages of the present invention will be apparent
to those skilled in the art after a consideration of the following detailed description
taken in conjunction with the accompanying drawings in which a preferred form of
the present invention is illustrated.
SUMMARY OF THE INVENTION
This summary is provided to introduce concepts related to a system and a method
for extraction of carbon dust. The concepts are further described below in the
detailed description. This summary is not intended to identify key features or
essential features of the claimed subject matter, nor is it intended to be used to
limit the scope of the claimed subject matter.
The present disclosure relates to carbon dust extraction system for synchronous
motors, comprises a slip ring assembly having a dust-collecting unit for extraction
of carbon dust dropping from the carbon brush and a carbon dust collector
assembly is connected to a carbon dust extraction unit through a pipe. The carbon
dust extraction unit consists of motor driven fan for automatic extraction of carbon
dust.
The present disclosure relates to a method of carbon dust extraction for
synchronous motors, comprising the steps of: configuring a slip ring assembly
having a dust-collecting unit for extracting carbon dust dropping from the carbon
brush and connecting a carbon dust collector assembly to a carbon dust extraction
unit through a pipe for automatic extraction of carbon dust.

In an aspect, the slip ring assembly includes an annular plate in segments in the
dust-collecting unit which is used for collecting the carbon dust.
Other objects, features and advantages of the present disclosure will become
apparent from the following detailed description. It should be understood, however,
that the detailed description and the specific examples, while indicating specific
embodiments of the invention, are given by way of illustration only, since various
changes and modifications within the spirit and scope of the invention will become
apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
While the specification concludes with claims particularly pointing out and distinctly
claiming the subject matter that is regarded as forming the present subject matter,
it is believed that the present disclosure will be better understood from the following
description taken in conjunction with the accompanying drawings, where like
reference numerals designate like structural and other elements, in which:
FIG. 1 shows a sectional view assembly of a carbon dust extraction system in an
embodiment of the present invention; and
FIG. 2 shows a top view assembly of the carbon dust extraction system in an
embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The detailed description of various exemplary embodiments of the disclosure is
described herein with reference to the accompanying drawings. It should be noted

that the embodiments are described herein in such details as to clearly
communicate the disclosure. However, the amount of details provided herein is not
intended to limit the anticipated variations of embodiments; on the contrary, the
intention is to cover all modifications, equivalents, and alternatives falling within
the spirit and scope of the present disclosure as defined by the appended claims.
It is also to be understood that various arrangements may be devised that, although
not explicitly described or shown herein, embody the principles of the present
disclosure. Moreover, all statements herein reciting principles, aspects, and
embodiments of the present disclosure, as well as specific examples, are intended
to encompass equivalents thereof.
The terminology used herein is for the purpose of describing particular
embodiments only and is not intended to be limiting of example embodiments. As
used herein, the singular forms “a”, “an”, and “the” are intended to include the
plural forms as well, unless the context clearly indicates otherwise. It will be further
understood that the terms “comprises”, “comprising”, “includes”, “consisting”
and/or “including” when used herein, specify the presence of stated features,
integers, steps, operations, elements and/or components, but do not preclude the
presence or addition of one or more other features, integers, steps, operations,
elements, components and/or groups thereof.
It should also be noted that in some alternative implementations, the functions/acts
noted may occur out of the order noted in the figures. For example, two figures
shown in succession may, in fact, be executed concurrently or may sometimes be
executed in the reverse order, depending upon the functionality/acts involved.

Unless otherwise defined, all terms (including technical and scientific terms) used
herein have the same meaning as commonly understood by one of ordinary skill in
the art to which example embodiments belong. It will be further understood that
terms, e.g., those defined in commonly used dictionaries, should be interpreted as
having a meaning that is consistent with their meaning in the context of the relevant
art and will not be interpreted in an idealized or overly formal sense unless expressly
so defined herein.
Embodiments explained herein pertain to a system for carbon dust extraction for
hydro generators/synchronous motors. FIG. 1 shows a sectional view assembly of
a carbon dust extraction system 100 in an embodiment of the present invention.
The carbon dust extraction system 100 for synchronous motors comprises a slip
ring assembly 102 having a dust-collecting unit for extraction of carbon dust
dropping from the carbon brush and a carbon dust collector assembly 104 which
is connected to a carbon dust extraction unit 108 through a pipe 106 for automatic
extraction of carbon dust.
In one embodiment a method of carbon dust extraction for synchronous motors,
comprising the steps of: configuring a slip ring assembly 102 having a dust-
collecting unit for extracting carbon dust dropping from the carbon brush and
connecting a carbon dust collector assembly 104 to a carbon dust extraction unit
108 through a pipe 106 for automatic extraction of carbon dust.
In one embodiment the slip ring assembly 102 includes an annular plate in
segments in the dust-collecting unit which is used for collecting the carbon dust.

FIG. 2 shows a top view assembly of the carbon dust extraction system 100 in an
embodiment of the present invention. The slip ring assembly 102 (shown in
FIG.1), annular plate is circular in shape. The carbon dust extraction unit 108
consists of motor driven fan or blower which sucks the carbon dust through pipe
106. In one embodiment the synchronous motors is a hydro-generator. The slip
ring assembly 102 works when a predetermined operation is performed on the
synchronous motors. The carbon dust extraction system 100 further comprises
replaceable filter bag which is easily cleaned. The automatic extraction of carbon
dust occurs in a predetermined interval.
In one embodiment a vacuum seal is located around the slip ring assembly 102
and forms a vacuum in the carbon brushes and/or brush holders in the carbon dust
extraction system 100. The carbon dust extraction system 100 could be
constructed of an anti-static, non-conductive material that is capable of
withstanding the temperatures / Fahrenheit inside of the slip ring assembly 102,
such as polytetrafluoroethylene (PTFE).
Although the above detailed description illustrates carbon dust extraction system
100 consistent with the present invention in the context of a synchronous
generator, it will be clear to one of skill in the art that the carbon dust extraction
system 100 of the present invention may be applied to any rotating electrical device
that utilizes wearable components. Thus, the scope of the invention should be
determined by the appended claims and their legal equivalents, rather than by the
examples given above.

TECHNICAL ADVANTAGE
The present disclosure proposes a system for carbon dust extraction for hydro
generators/synchronous motors.
The present disclosure proposes a method and a system for carbon dust extraction
which is simple in construction and easy assembling.
The present disclosure proposes a method and a system for carbon dust extraction
which works effectively and could be adopted to any design of carbon brush.
The present disclosure proposes a method and a system for carbon dust extraction
which eliminates manual cleaning.
The present disclosure proposes a method and a system for carbon dust extraction
having replaceable filter bag which is easily cleaned.
The present disclosure proposes a method and a system for carbon dust extraction
which reduces the time required for manual cleaning and the carbon dust is
extracted automatically.
Furthermore, each of the appended claims defines a separate invention, which for
infringement purposes is recognized as including equivalents to the various
elements or limitations specified in the claims. Depending on the context, all
references below to the “invention” may in some cases refer to certain specific
embodiments only. In other cases, it will be recognized that references to the
“invention” will refer to subject matter recited in one or more, but not necessarily
all, of the claims.

Groupings of alternative elements or embodiments of the invention disclosed herein
are not to be construed as limitations. Each group member can be referred to and
claimed individually or in any combination with other members of the group or other
elements found herein. One or more members of a group can be included in, or
deleted from, a group for reasons of convenience and/or patentability. When any
such inclusion or deletion occurs, the specification is herein deemed to contain the
group as modified thus fulfilling the written description of all groups used in the
appended claims.
Furthermore, those skilled in the art can appreciate that the terminology used
herein is for the purpose of describing particular embodiments only and is not
intended to be limiting of the present disclosure. It will be appreciated that several
of the above-disclosed and other features and functions, or alternatives thereof,
may be combined into other systems or applications. Various presently unforeseen
or unanticipated alternatives, modifications, variations, or improvements therein
may subsequently be made by those skilled in the art without departing from the
scope of the present disclosure as encompassed by the following claims.
The claims, as originally presented and as they may be amended, encompass
variations, alternatives, modifications, improvements, equivalents, and substantial
equivalents of the embodiments and teachings disclosed herein, including those
that are presently unforeseen or unappreciated, and that, for example, may arise
from applicants/patentees and others.

While the foregoing describes various embodiments of the present disclosure, other
and further embodiments of the present disclosure may be devised without
departing from the basic scope thereof. The scope of the present disclosure is
determined by the claims that follow. The present disclosure is not limited to the
described embodiments, versions or examples, which are included to enable a
person having ordinary skill in the art to make and use the invention when combined
with information and knowledge available to the person having ordinary skill in the
art.

WE CLAIM:
1. A carbon dust extraction system (100) for synchronous motors,
comprising:
- a slip ring assembly (102) having an annular plate in segments in a dust-
collecting unit for extraction of carbon dust dropping from the carbon
brush,
- a carbon dust collector assembly (104) connected to a carbon dust
extraction unit (108) through a pipe (106), and wherein
- the carbon dust extraction unit (108) consists of a motor driven fan for
automatic extraction of carbon dust.

2. The system as claimed in claim 1, wherein the motor fan of carbon dust
extraction unit (108) acts as a blower for automatic extraction of
carbon dust.
3. The system as claimed in claim 1, wherein the annular plate is circular
in shape.
4. The system as claimed in claim 1, wherein the synchronous motor is a
hydro-generator.
5. The system as claimed in claim 1, wherein the slip ring assembly (102)
activated when a predetermined operation is performed on the
synchronous motors.
6. The system as claimed in claim 1, wherein automatic extraction of
carbon dust occurs in a predetermined interval.

7. A method of carbon dust extraction for synchronous motors, comprising
the steps of:
- configuring a slip ring assembly (102) having an annular plate in
segments in a dust-collecting unit for extraction of carbon dust dropping
from the carbon brush; and
connecting a carbon dust collector assembly (104) to a carbon dust
extraction unit (108) through a pipe (106), and
- extracting the carbon dust automatically through the carbon dust
extraction unit (108) having a motor driven fan.