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 slip ring adapter and motor with slip ring assembly thereof
APPLICANTS :
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 motors.
Particularly, this invention relates to slip ring motors.
Still particularly, this invention relates to a slip ring adapter and motor with slip ring assembly thereof.
Background of the Invention:
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 rotor is the rotating assembly. 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. 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.

It was observed that the internal fan mounting was not a steady mounting. There was a lot of vibration due to the blade rotation of the fan. Also, the fan was placed after vibration test of motor was done. Hence, there was no guarantee of the vibration caused due to such an auxiliary fan.
Also, the wired as mentioned above are not guided appropriately, leading to cumbersome wiring in the slip ring assembly.
Such of types of assemblies lead to fan support breakdown as the support assembly may be damaged due to inherent and constant vibrations.
There is a need for a better and improved fan mounting assembly for slip ring.
There is also need for a better and improved wire guiding assembly.
Prior Art:
In existing practice, Stud type slip rings mounted Fan and Techo are using for external slip ring in HT/LT motors.
There was a lot of problems like Fan stud breaking and bending, cable breaking problem and fan breaking.
US5773906 discloses a Brush and slip ring arrangement of an AC generator. Here, the slip ring and the connection bar are insert-molded in a slip-ring-support made of a resinous material. The slip-ring-support is press-fitted to a rear portion of the rotor so that the slip ring and the connection bar are fixed to the shaft at the same

time. However, the problem of cable mounting / guiding and fan stud breaking still persists.
WO9005395 discloses a SLIP RING ARRANGEMENT. It is illustrated that a Slip ring arrangement for the rotor of an electrical machine-in particular of an alternator for motor vehicles, railways, buses, and the like-with a rotor shaft supporting the rotor and a slip ring holder located on its end, with slip rings and connecting leads which connect these with the exciter winding of the rotor, in which the slip rings and the connecting leads are embedded in a one-piece plastic support part, which is fixed on a spigot of smaller diameter, arranged on the end of the rotor shaft, characterized by the fact that the connecting leads emerge with their end part which is remote from the slip rings, in front of an end disc from the support part, that the end disc is made in one piece with the support part and that the thus prefabricated slip ring holder is pushed on the end face spigot of the rotor shaft. However, the problem of cable mounting / guiding and fan stud breaking still persists.
Objects of the Invention:
An object of the invention is to provide a stable fan mounting assembly.
Another object of the invention is to provide a vibration - free fan mounting assembly.
Yet another object of the invention is to provide a thorough wire guiding assembly.

Still another object of the invention is to eliminate breakdown of fan assemblies in slip ring assemblies.
Summary of the Invention:
According to this invention, there is provided a slip ring adapter, adapted to be fitted axially onto a shaft, said adapter comprises:
a. a bell mouth shaped unit consisting of a neck member seamlessly extending
into a shoulder member, said neck member and said shoulder member, being
substantially circular cross-section, hollow members;
b. locking mechanism at operative bottom of said neck member of said slip ring
adapter in order to secure the slip ring adapter into the slip ring assembly, at a
defined shaft axial centre hole, in line with the shaft;
c. a plurality of through-slots about the circumference of said neck member to
allow passage of wires through said slip ring adapter; and
d. at least a circumferential ring to receive a fan.
Typically, said slip ring adapter is a shaft mounted slip ring adapter.
Particularly, said slip ring adapter is a rotor shaft mounted slip ring adapter.
Typically, said locking mechanism is a threaded guide.
Alternatively, said locking mechanism is a set of radially dispersed locking studs.
Typically, the diameter of said threaded guide is less than the diameter of the operative bottom surface of said neck member which provides a circumferential

collar to provide additional bolting arrangements with respect to said shaft for secure positioning.
Preferably, said through-slots are kidney holes.
Typically, said circumferential ring is a stepped ring with at least an inner step placed above an outer step.
Typically, said circumferential ring is a stepped ring with at least an inner step placed above an outer step, said inner step adapter to receive a fan and said outer step adapted to receive a speed measurement element.
Typically, said circumferential ring is a stepped ring with at least an inner step placed above an outer step, said outer step ring adapted to mount a stub shaft for mounting auxiliary elements.
Alternatively, said circumferential ring is a multiple stepped circumferential ring in order to receive multiple auxiliary elements or external assemblies.
According to this invention, there is provided a motor with a slip ring assembly having a rotor mounted on a rotor shaft and at least a fan for said slip ring assembly, said motor comprises:
a. rotor shaft including an axial shaft centre hole at its axial end;
b. bell mouthed slip ring adapter with a neck member seamlessly extending into a
shoulder member, said neck member and said shoulder member, being
substantially circular cross-section, hollow members;

c. locking mechanism at operative bottom of said neck member of said slip ring
adapter in order to secure the slip ring adapter into the slip ring assembly, at
said shaft axial centre hole, in line with the shaft;
d. plurality of through-slots about the circumference of said neck member to
allow passage of wires through said slip ring adapter;
e. at least a circumferential ring to receive a fan;
f. stub shaft extends from the adapter for providing a mounting base for.;
g. cutout for cables, said cables further being guided through said through-holes;
h. grommet / bush ring for holding slip ring cables; and
i. plurality of locking means for positive locking of the slip ring adapter on said rotor shaft.
Brief Description of the Accompanying Drawings:
Figure 1 illustrates a motor assembly with a heat exchanger and slip ring assembly; and
Figure 2 illustrates a front view of the slip ring assembly of the prior art.
The invention will now be described in relation to the accompanying drawings, in which:
Figure 3 illustrates a front view of the slip ring assembly;
Figure 4 illustrates a schematic of a side auxiliary view of the slip ring adapter;
Figure 5 illustrates a schematic of a back auxiliary view of the slip ring adapter;

Figure 6 illustrates another schematic of a side auxiliary view of the slip ring adapter;
Figure 7 illustrates a schematic of a front view of the slip ring adapter;
Figure 8 illustrates a schematic of a side view of the slip ring adapter; and
Figure 9 illustrates a schematic of a back view of the slip ring adapter.
Detailed Description of the Accompanying Drawings:
Figure 1 illustrates a motor assembly (22), having a stator and rotor, with a heat exchanger (24) and slip ring assembly (26). The heat exchanger is adapted to cool the associated motor. Reference numeral 27 refers to a fan for circulating external air. Reference numeral 29 refers to a fan for circulating internal air. Many problems were observed as mentioned above with the mount of the fan (29).
Figure 2 illustrates a front view of the slip ring assembly (26) of the prior art. A rotor shaft (1) extending from the rotor of the adjoining motor assembly (22, as shown in Figure 1) provides leverage for supporting the slip ring (2). A fan mounting stud (3) provides support for mounting a slip ring fan (4). A brush gear assembly (5) is located above said slip ring (2). Reference numeral (6) refers to a cable socket for slip ring and reference numeral (7) refers to a slip ring cable from rotor.
According to this invention, there is provided a slip ring adapter.

In order to overcome the limitations of the prior art, a slip ring adapter is placed in a slip ring assembly, extending from a rotor shaft. The adapter provides support for a fan, a generator, and the like.
Figure 3 illustrates a front view of the slip ring assembly (26) according to the invention, said slip ring assembly housing the slip ring adapter (100). Here, a stub shaft (9) extends from the adapter for providing a mounting base for TECHO mounting. The rotor shaft (1) includes a shaft centre hole (10) at its axial end for axially locking the slip ring adapter (100). A cutout (11) for cables is provided, These cables are further guided through the slip ring adapter (as shown in Figures 4 to 9 of the accompanying drawings). Reference numeral (13) refers to a grommet / bush ring for holding slip ring cables.
Reference numeral (14) refers to the numerous bolts for positive locking of the slip ring adapter on the rotor shaft.
Figure 4 illustrates a schematic of a side auxiliary view of the slip ring adapter
(100).
Figure 5 illustrates a schematic of a back auxiliary view of the slip ring adapter
(100).
Figure 6 illustrates another schematic of a side auxiliary view of the slip ring
adapter (100).
Figure 7 illustrates a schematic of a front view of the slip ring adapter (100).
Figure 8 illustrates a schematic of a side view of the slip ring adapter (100).

Figure 9 illustrates a schematic of a back view of the slip ring adapter (100).
In accordance with an embodiment of this invention, there is provided a slip ring adapter (100).
Typically, said slip ring adapter is a shaft mounted slip ring adapter.
Typically, said slip ring adapter is a rotor shaft mounted slip ring adapter.
The slip ring adapter (100) is a bell mouth shaped adapter.
In accordance with an embodiment of this invention, said bell mouth shaped adapter comprises a neck member (42) seamlessly extending into a shoulder member (40). The neck member (42) and shoulder member, being substantially circular in cross-section, are hollow members.
In accordance with another embodiment of this invention, there is provided a threaded guide (44) at operative bottom of said neck member of said slip ring adapter. The threaded guide secures the slip ring adapter into the slip ring assembly, typically at its shaft centre hole (10) (as shown in Figure 3 of the accompanying drawings). Alternatively, it may be any type of locking or screwing mechanism to securely hold the slip ring adapter in line with the shaft.
Typically, the diameter of said threaded guide (44) is less than the diameter of the operative bottom surface of said neck member (42). This ensures that a

circumferential collar (46) is provided which may provide additional bolting arrangements with respect to said shaft for secure positioning.
In accordance with yet another embodiment of this invention, there is provided a plurality of through-slots (47) about the circumference of said neck member (42). Typically, the through-slots are kidney holes. These kidney holes are wire guides which allow passage of wires through said slip ring adapter (100) in a non-cumbersome manner. A plurality of wires may find an entry or exit passage through the kidney holes radially dispersed about the circumference of the adapter. The complementary exit of entry of the wires is through the open portion of the shoulder member (40). The radial convergence or divergence of wires provide a neat, clean, and efficient wire guide assembly without hindering or encroaching upon the other portions of the slip ring assembly.
In accordance with still another embodiment of this invention, there is provided at least a circumferential ring (48) to receive a fan. Typically, the circumferential ring is a stepped ring with an inner step (52) placed above an outer step (54). The outer step ring is adapted to receive a fan, while the inner step ring is adapted to receive a TECHO generator for speed measurement of shaft. The outer step ring typically mounts a stub shaft on which the TECHO generator is mounted.
There are provided numerous slots (62) on the ring (48) for providing locking arrangement for the fan and auxiliary equipment.
Alternatively, there may be multiple steps in the form of circumferential rings in order to receive multiple auxiliary or external assemblies.

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 slip ring adapter, adapted to be fitted axially onto a shaft, said adapter
comprising:
a. a bell mouth shaped unit consisting of a neck member seamlessly extending
into a shoulder member, said neck member and said shoulder member, being
substantially circular cross-section, hollow members;
b. locking mechanism at operative bottom of said neck member of said slip
ring adapter in order to secure the slip ring adapter into the slip ring
assembly, at a defined shaft axial centre hole, in line with the shaft;
c. a plurality of through-slots about the circumference of said neck member to
allow passage of wires through said slip ring adapter; and
d. at least a circumferential ring to receive a fan.
2. An adapter as claimed in claim 1 wherein, said slip ring adapter is a shaft mounted slip ring adapter.
3. An adapter as claimed in claim 1 wherein, said slip ring adapter is a rotor shaft mounted slip ring adapter.
4. An adapter as claimed in claim 1 wherein, said locking mechanism is a threaded guide.
5. An adapter as claimed in claim 1 wherein, said locking mechanism is a set of radially dispersed locking studs.

6. An adapter as claimed in claim 1 wherein, the diameter of said threaded guide is less than the diameter of the operative bottom surface of said neck member which provides a circumferential collar to provide additional bolting arrangements with respect to said shaft for secure positioning.
7. An adapter as claimed in claim 1 wherein, said through-slots are kidney holes.
8. An adapter as claimed in claim 1 wherein, said circumferential ring is a stepped ring with at least an inner step placed above an outer step.
9. An adapter as claimed in claim 1 wherein, said circumferential ring is a stepped ring with at least an inner step placed above an outer step, said inner step adapter to receive a fan and said outer step adapted to receive a speed measurement element.
10. An adapter as claimed in claim 1 wherein, said circumferential ring is a stepped ring with at least an inner step placed above an outer step, said outer step ring adapted to mount a stub shaft for mounting auxiliary elements.
11. An adapter as claimed in claim 1 wherein, said circumferential ring is a multiple stepped circumferential ring in order to receive multiple auxiliary elements or external assemblies.
12. A motor with a slip ring assembly having a rotor mounted on a rotor shaft and at least a fan for said slip ring assembly, said motor comprising:
a. rotor shaft including an axial shaft centre hole at its axial end;

b. bell mouthed slip ring adapter with a neck member seamlessly extending
into a shoulder member, said neck member and said shoulder member, being
substantially circular cross-section, hollow members;
c. locking mechanism at operative bottom of said neck member of said slip
ring adapter in order to secure the slip ring adapter into the slip ring
assembly, at said shaft axial centre hole, in line with the shaft;
d. plurality of through-slots about the circumference of said neck member to
allow passage of wires through said slip ring adapter;
e. at least a circumferential ring to receive a fan;
f. stub shaft extends from the adapter for providing a mounting base for.;
g. cutout for cables, said cables further being guided through said through-
holes;
h. grommet / bush ring for holding slip ring cables; and
i. plurality of locking means for positive locking of the slip ring adapter on said rotor shaft.