FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION AN IMPREGNATION SYSTEM
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
Angadi Sameer Shrikant and Gawas Shraddha; both of Crompton Greaves Ltd, FHP Commercial Motors Division, 196-198, Kundaim, Goa - 403115, India; both Indian Nationals
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 an impregnation system.
BACKGROUND OF THE INVENTION:
Winding in the electric motor plays an important role in the performance of the motor. It is essential for better functioning of motor to have windings properly wound and baked in an oven.
Certain motors have the windings protected by epoxy resin or varnish. By impregnating the transformer with epoxy under a vacuum, one can replace air spaces within the windings with epoxy, thus sealing the windings and helping to prevent the possible formation of corona and absorption of dirt or water. This produces transformers more suited to damp or dirty environments.
A winding is pressed into a shell.
The entire winding along with its shell is dipped in a tank containing the varnish. The varnish, therefore, coats the winding, and also coats the shell from outside. It also results in accumulation of varnish on shell spigots. This shell coating is undesirable. The varnish becomes hard after the next process of baking. This coating needs to be cleaned. Painting quality deteriorates even after the varnish is

removed. It may also result in alignment disturbances due to accumulation on the
machined surface.
There is a need for a better impregnation or coating system.
PRIOR ART:
US6961989 discloses a stator device which prevents the formation of varnish accumulation on jumper wires by providing a space between the jumper wire and at least one of a supporting stud and a stator body. However, design bed for placing stators is not mentioned.
US7288870 discloses a stator core using electrical machines with electromagnetic windings and high conductivity lamination at the core ends, whereas, the lamination acts as a clamping plate for the stator core.
The US Patent US4496870 discloses a stator end windings of an electrical machine that comprises a clamping plate with a projecting portion, where the clamping plate is used to support the stator winding.
Prevention of accumulation of varnish / resin on the outer diameter is not disclosed.
OBJECTS OF THE INVENTION:
An object of the invention is to provide coating only on the windings in a shell.
Another object of the invention is to prevent coating on the exterior of the shell.

Yet another object of the invention is to provide an impregnation system for coating windings.
Still another object of the invention is to reduce the amount of varnish being used for coating.
SUMMARY OF THE INVENTION:
According to this invention, there is provided ?in impregnation system which comprises:
a) dipping tank adapted to receive fluid (varnish) from its operative bottom;
b) bottom plate, inside said dipping tank, said bottom plate spaced apart from the bottom of said dipping tank and adapted to receive wound stators on its operative upper side, and further adapted to include channels for allowing entry of varnish only on the inner side of said wound stators;
c) top plate adapted to be clamped over each of said received wound stators fitted over said bottom plate, said top plate including channels for allowing exit of varnish that has seeped through into the wound stators from the bottom; and
d) elongate conduits adapted to be fitted over each of said wound stators through said top clamped plate for retaining overflowing fluid (varnish), thereby ensuring prevention of fluid (varnish) contact on the exterior of said wound stator.
Typically, said system includes clamping means adapted to clamp said top plate and therefore said wound stators out of said dipping tank.

Typically, said system includes a first pneumatic cylinder for holding onto said top plate for removal of wound stators.
Typically, said system includes a transfer tank adapted to hold fluid (varnish) before being transferred to said dipping tank.
Typically, said system includes a transfer pipe adapted to transfer fluid (varnish) from said transfer tank to said dipping tank.
Typically, said system includes a second pneumatic cylinder adapted to hold said transfer tank at a higher pedestal as compared to said dipping tank to allow transfer of fluid from a higher placed transfer tank to a lower placed dipping tank.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 illustrates a schematic of the impregnating system of the prior art.
The invention will now be described in relation to the accompanying drawings, in
which:
Figure 2 illustrates a schematic of the impregnating system.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 illustrates a schematic of the impregnating system of the prior art.

A dipping tank (10) is provided which includes the varnish / resin (12) which is to be coated. The varnish is transferred to the dipping tank from a transfer tank (14) by means of a transfer pipe (16). A lifting pneumatic cylinder (18) ensures that the transfer tank is at a higher pedestal than the dipping tank for transfer of varnish from a higher pedestal to a lower pedestal. A resting mesh (20) is adapted to receive the wound stators (22). Once the stators (24) are placed in the dipping tank, the varnish is released from the transfer tank. This released varnish enters the dipping tank through its operative bottom and percolates through the resting mesh into the placed wound stators. The varnish, then, enters the stator shell and envelopes the windings as well as the stator shell from inside as well as outside. Thus, the varnish percolates and seeps through undesired areas. This results in wastage of varnish, amongst other things, as mentioned above.
According to this invention, there is provided an impregnation system.
Figure 2 illustrates a schematic of the impregnating system.
In accordance with this invention, there is provided a dipping tank (30) adapted to receive fluid (varnish) (12) from its operative bottom.
In accordance with another embodiment of this invention, there is provided a bottom plate (32) adapted to receive wound stators (24) on its operative upper side. The bottom plate includes channels for allowing entry of varnish only on the inner side of said wound stators.

In accordance with yet another embodiment of this invention, there is provided a top plate (34) adapted to be clamped over each of said received wound stators fitted over the bottom plate. This top plate includes channels for allowing exit of varnish that has seeped through into the wound stators from the bottom. It ensures that the exiting varnish does not find its way on the exterior of the wound stator.
In accordance with still another embodiment of this invention, there are provided elongate conduits (36) adapted to be fitted over each of said wound stators through the top clamped plate. These elongate conduits allow a channel for retaining overflowing resin / varnish. This further ensures that the overflowing varnish does not flow out onto the wound stator exterior.
In accordance with an additional embodiment of this invention, there is provided a clamping means (38) adapted to clamp said top plate and therefore said wound stators out of said dipping tank. The clamping means is connected to a pneumatic cylinder for holding onto said plate for removal of wound stators.
Thus, productivity may be improved by eliminating non-value added processes of clearing shell spigot. Also, there is less consumption of varnish / resin due to the use of this invention.
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. An impregnation system comprising:
a) dipping tank adapted to receive fluid (varnish) from its operative bottom;
b) bottom plate, inside said dipping tank, said bottom plate spaced apart from the bottom of said dipping tank and adapted to receive wound stators on its operative upper side, and further adapted to include channels for allowing entry of varnish only on the inner side of said wound stators;
c) top plate adapted to be clamped over each of said received wound stators fitted over said bottom plate, said top plate including channels for allowing exit of varnish that has seeped through into the wound stators from the bottom; and
d) elongate conduits adapted to be fitted over each of said wound stators through said top clamped plate for retaining overflowing fluid (varnish), thereby ensuring prevention of fluid (varnish) contact on the exterior of said wound stator.

2. A system as claimed in claim 1 wherein, said system includes clamping means adapted to clamp said top plate and therefore said wound stators out of said dipping tank.
3. A system as claimed in claim 1 wherein, said system includes a first pneumatic cylinder for holding onto said top plate for removal of wound stators.

4. A system as claimed in claim 1 wherein, said system includes a transfer tank adapted to hold fluid (varnish) before being transferred to said dipping tank.
5. A system as claimed in claim 1 wherein, said system includes a transfer pipe adapted to transfer fluid (varnish) from said transfer tank to said dipping tank.
6. A system as claimed in claim 1 wherein, said system includes a second pneumatic cylinder adapted to hold said transfer tank at a higher pedestal as compared to said dipping tank to allow transfer of fluid from a higher placed transfer tank to a lower placed dipping tank.