FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
AND
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2005
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A separator assembly for slip rings of electrical rotating machine and electrical rotating machines, thereof.
APPLICANTS (S)
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR (S)
Wadbude Sahebrao of Crompton Greaves Ltd., Machine (M7) Division, D-5 Industrial Area, MPAKVN, Mandideep - 462046, Madhya Pradesh, India; an Indian National.
PREAMBLE TO THE DESCRIPTION:
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

FIELD OF THE INVENTION:
This invention relates to the field of mechanical or electro-mechanical assemblies.
Particularly, this invention relates to electrical rotating machines or motors.
More particularly, this invention relates to slip rings of electrical rotating machines or motors.
Specifically, this invention relates to a separator assembly for slip rings of electrical rotating machine and electrical rotating machines, thereof.
BACKGROUND OF THE INVENTION:
A motor is a type of an electrical rotating machine. A motor is an electromechanical device which converts electrical energy to mechanical energy. A motor comprises a rotor and stator. It may be coupled with a heat exchanger for cooling the motor continuously, thereby preventing it from damage. The stator is the stationary assembly of the motor. The rotor is the rotating assembly of the motor. A motor assembly includes a slip ring. A slip ring is a method of making an electrical connection through a rotating assembly.
A slip ring consists of a conductive circle or band mounted on a shaft and insulated from it. Electrical connections from the rotating part of the system, such as the rotor of a generator, are made to the ring. Fixed contacts or brushes run in contact with the ring, transferring electrical power or signals to the exterior, static part of the system.
Typically, a rotor shaft extends from the motor and it hosts the slip ring. The rotor

shaft is a rotatable shaft adapted to be angularly displaced about its own longitudinal axis. A brush gear assembly is installed above the slip ring. There are provided cable sockets for electrical connection of slip ring and fan. The fan is shaft mounted. One fan is mounted to circulate external air. Another fan is mounted to circulate internal air.
For a three-phase supply, three slip rings can be seen. Each phase of slip ring is spaced apart from the other phase. These slip rings are co-axial. In these assemblies or arrangements, there is no direct cooling of the slip rings. Therefore, slip ring temperature may rise, thereby resulting in motor temperature rise and motor malfunction.
There is a need for a better and improved slip ring assembly with improved cooling.
Also, there is a need for a better and improved slip ring assembly which prevents flashover.
PRIOR ART:
DEI02009048265 discloses a separator between two rings but it discloses this separator arrangement for segregation purposes only (and hence cooling and weight reduction). During flashover, in the slip ring as disclosed by DEI02009048265, it cannot protect slip ring arrangement from flashover.
Hence, there is a need for an improvement in design and function.

OBJECTS OF THE INVENTION:
An object of the invention is to provide a better and improved slip ring assembly with improved cooling.
Another object of the invention is to provide a better and improved slip ring assembly which prevents flashover.
Yet another of the invention is to provide a better and improved electrical rotating machine with improved cooling.
Still another of the invention is to provide a better and improved electrical rotating machine which prevents flashover.
SUMMARY OF THE INVENTION:
According to this invention, there is provided a separator assembly for slip rings of electrical rotating machines, said assembly comprises a ring adapted to be placed co-axial with slip rings such that each pair of adjacent phases of said slip rings includes an intermittent ring, said rings including orthogonally protruding fins adapted to be radially dispersed about said ring, and said each of said ring and said fins being spaced apart from the slip rings.
According to this invention, there is also provided a separator assembly for slip rings of electrical rotating machines, said slip rings being groups of rings or discs mounted on a rotor shaft of an electrical rotating machine, a first group of rings relating to a first phase, a second group of rings relating to a second phase, and a third group of rings relating to a third phase, said assembly comprises a ring adapted to be placed co-axial with slip rings such that each pair of adjacent phases

of said slip rings includes an intermittent ring, said rings including orthogonally protruding fins adapted to be radially dispersed about said ring, and said each of said ring and said fins being spaced apart from the slip rings.
According to this invention, there is further provided an electrical rotating machine with a separator assembly for slip rings of electrical rotating machines, said assembly comprises a ring adapted to be placed co-axial with slip rings such that each pair of adjacent phases of said slip rings includes an intermittent ring, said rings including orthogonally protruding fins adapted to be radially dispersed about said ring, and said each of said ring and said fins being spaced apart from the slip rings.
According to this invention, there is still further provided an electrical rotating machine with a separator assembly for slip rings of electrical rotating machines, said slip rings being groups of rings or discs mounted on a rotor shaft of an electrical rotating machine, a first group of rings relating to a first phase, a second group of rings relating to a second phase, and a third group of rings relating to a third phase, said assembly comprises a ring adapted to be placed co-axial with slip rings such that each pair of adjacent phases of said slip rings includes an intermittent ring, said rings including orthogonally protruding fins adapted to be radially dispersed about said ring, and said each of said ring and said fins being spaced apart from the slip rings.
Typically, said fins project from both sides of said ring.
Typically, said fins being disposed on said ring such that they align with the radius of said ring.

Typically, said rings are separator rings.
Typically, said rings are co-axially mounted with respect to said slip rings and about a rotor shaft.
Typically, said ring is an epoxy sheet ring with fins extruded out of said ring.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 illustrates a schematic sectional view of a motor with heat exchanger and slip ring assembly, thereof;
Figure 2a illustrates a close-up side sectional view of the mounting of a slip ring (2) on a rotor shaft of the motor; and
Figure 2b illustrates a close-up front sectional view of the mounting of a slip ring (2) on a rotor shaft of the motor.
The invention will now be described in relation to the accompanying drawings, in which:
Figure 3 illustrates a schematic isometric view of the separator assembly for slip rings;
Figure 4 illustrates a schematic front view of the separator assembly for slip rings;
Figure5 illustrates a schematic back isometric view of slip rings for 3-phase motors along with separator rings, interlocated, therebetween;

Figure 6 illustrates a schematic side view of slip rings for 3-phase motors along with separator rings, interlocated, therebetween; and
Figure7 illustrates a schematic front isometric view of slip rings for 3-phase motors along with separator rings, interlocated, therebetween.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 illustrates a schematic sectional view of a motor with heat exchanger and slip ring assembly, thereof. Reference numeral 12 refers to the motor assembly. Reference numeral 14 refers to the heat exchanger assembly which aid in cooling the motor assembly by heat transfer principles. Reference numeral 2 refers to slip rings.
Figure 2a illustrates a close-up side sectional view of the mounting of a slip ring (2) on a rotor shaft of the motor. Figure 2b illustrates a close-up front sectional view of the mounting of a slip ring (2) on a rotor shaft of the motor.
Reference numeral 1 refers to the rotor shaft of the motor. Reference numeral 2 refers to the slip ring. Reference numeral 3 refers to a fan mounting stud. Reference numeral 4 refers to slip ring fan. Reference numeral 5 refers to brush gear assembly. Reference numeral 6 refers to cable socket for slip ring. Reference numeral 7 refers to slip ring cable from rotor. Reference numeral 8 refers to slip ring external cover.
According to this invention, there is provided a separator assembly (100) for slip rings of motors and motors, thereof.

Figure 3 illustrates a schematic isometric view of the separator assembly for slip rings.
Figure 4 illustrates a schematic front view of the separator assembly for slip rings.
In accordance with an embodiment of this invention, there is provided a ring (50) adapted to be placed co-axial with slip rings. Each pair of adjacent phases of the slip rings includes an intermittent ring. The rings include orthogonally protruding fins (52) adapted to be radially dispersed about the ring. The fins project from both sides of the ring. The fins are disposed on the ring such that they align with the radius of the ring. These rings are separator rings. The rings as well as the fins are spaced apart from the slip rings.
Figure5 illustrates a schematic back isometric view of slip rings for 3-phase motors along with separator rings, interlocated, therebetween.
Figure 6 illustrates a schematic side view of slip rings for 3-phase motors along with separator rings, interlocated, therebetween.
Figure7 illustrates a schematic front isometric view of slip rings for 3-phase motors along with separator rings, interlocated, therebetween.
The slip rings are groups of rings or discs mounted on a rotor shaft of an electrical rotating machine. A first group of rings (42) relate to a first phase (R-phase). A second group of rings (44) relate to a second phase (Y-phase). A third group of rings (46) relate to a third phase (B-phase).

The slip ring is rotor shaft (1) mounted. The separator rings are also co-axially mounted with respect to the slip rings and about the rotor shaft. As the electrical rotating machine involves rotation of the rotor shaft, the slip rings rotate along with the separator rings. The separator ring assembly for slip rings acts as a separator to separate phases. The fins farther aid in churning the air in the slip rings during their operative states.
The interspaces between the fins provide for a cooling passage for internal hot air to be guided out and away from the rotor core and the slip rings.
The separator ring is, typically, made of an epoxy sheet with fins extruded out of the ring.
Flashover in the slip ring is defined as a condition wherein during continuous operation of slip ring, carbon brushes are continuously passing current in to the rotor which causes friction of carbon brushes and overheating sparking developed in to the slip ring chamber. In slip ring chamber R, Y, and B phases have same issue; so R phase spark should not go to the Y phase. Otherwise rotor winding failures will happen.
TECHNICAL ADVANCE:
This issue of flashover in slip ring is prevented by a separator ring (not provided in the prior art) which spaces apart the adjacent slip rings, the separator ring having orthogonal fins in a radially oriented manner such that the fins do not provide contact between the slip rings which are adjacent to the separator ring. Moreover, flashover that may be formed is arrested by the separated ring, in that, it provides a path for the flashover and the fins of the separator ring provide an end block for the

flashover. This reduces temperature rise in slip ring assemblies and achieves separation between two adjacently located phases. Also, this type of slip-ring (with separator plate, in between) is adapted to be used for higher ratings with compact size because this type of slip-ring has more cooling effect from others.
While this detailed description has disclosed certain specific embodiments of the present invention for illustrative purposes, various modifications will be apparent to those skilled in the art which do not constitute departures from the spirit and scope of the invention as defined in the following claims, and it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

We claim,
1. A separator assembly for slip rings of electrical rotating machines, said assembly comprising a ring adapted to be placed co-axial with slip rings such that each pair of adjacent phases of said slip rings includes an intermittent ring, said rings including orthogonally protruding fins adapted to be radially dispersed about said ring, and said each of said ring and said fins being spaced apart from the slip rings.
2. A separator assembly as claimed in claim 1, wherein said fins project from both sides of said ring.
3. A separator assembly as claimed in claim 1, wherein said fins being disposed on said ring such that they align with the radius of said ring.
4. A separator assembly as claimed in claim 1, wherein said rings are separator rings.
5. A separator assembly as claimed in claim 1, wherein said rings are co-axially mounted with respect to said slip rings and about a rotor shaft.
6. A separator assembly as claimed in claim 1, wherein said ring is an epoxy sheet ring with fins extruded out of said ring.
7. A separator assembly for slip rings of electrical rotating machines, said slip rings being groups of rings or discs mounted on a rotor shaft of an electrical rotating machine, a first group of rings relating to a first phase, a second

group of rings relating to a second phase, and a third group of rings relating to a third phase, said assembly comprising a ring adapted to be placed coaxial with slip rings such that each pair of adjacent phases of said slip rings includes an intermittent ring, said rings including orthogonally protruding fins adapted to be radially dispersed about said ring, and said each of said ring and said fins being spaced apart from the slip rings.
8. A separator assembly as claimed in claim 7, wherein said fins project from both sides of said ring,
9. A separator assembly as claimed in claim 7, wherein said fins being disposed on said ring such that they align with the radius of said ring.
10. A separator assembly as claimed in claim 7, wherein said rings are separator rings.
11. A separator assembly as claimed in claim 7, wherein said rings are co-axially mounted with respect to said slip rings and about a rotor shaft.
12. A separator assembly as claimed in claim 7, wherein said ring is an epoxy sheet ring with fins extruded out of said ring.
13. An electrical rotating machine with a separator assembly for slip rings of electrical rotating machines, said assembly comprising a ring adapted to be placed co-axial with slip rings such that each pair of adjacent phases of said slip rings includes an intermittent ring, said rings including orthogonally

protruding fins adapted to be radially dispersed about said ring, and said each of said ring and said fins being spaced apart from the slip rings.
14. An electrical rotating machine as claimed in claim 13, wherein said fins project from both sides of said ring.
15. An electrical rotating machine as claimed in claim 13, wherein said fins being disposed on said ring such that they align with the radius of said ring.
16. An electrical rotating machine as claimed in claim 13, wherein said rings are separator rings.
17. An electrical rotating machine as claimed in claim 13, wherein said rings are co-axially mounted with respect to said slip rings and about a rotor shaft.
18. An electrical rotating machine as claimed in claim 13, wherein said ring is an epoxy sheet ring with fins extruded out of said ring.
19. A electrical rotating machine with a separator assembly for slip rings of electrical rotating machines, said slip rings being groups of rings or discs mounted on a rotor shaft of an electrical rotating machine, a first group of rings relating to a first phase, a second group of rings relating to a second phase, and a third group of rings relating to a third phase, said assembly comprising a ring adapted to be placed co-axial with slip rings such that each pair of adjacent phases of said slip rings includes an intermittent ring, said rings including orthogonally protruding fins adapted to be radially dispersed

about said ring, and said each of said ring and said fins being spaced apart from the slip rings.
20. An electrical rotating machine as claimed in claim 19, wherein said fins project from both sides of said ring.
21. An electrical rotating machine as claimed in claim 19, wherein said fins being disposed on said ring such that they align with the radius of said ring.
22. An electrical rotating machine as claimed in claim 19, wherein said rings are separator rings.
23. An electrical rotating machine as claimed in claim 19, wherein said rings are co-axially mounted with respect to said slip rings and about a rotor shaft.
24. An electrical rotating machine as claimed in claim 19, wherein said ring is an epoxy sheet ring with fins extruded out of said ring.