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 modular air guide
APPLICANTS (S)
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR (S)
Pandya Ankit and Upadhyay Amarendra of both of Crompton Greaves Limited, Machine (M7) Division, Industrial Area, MPAKVN, Mandideep - 462046, Madhya Pradesh, 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 the field of mechanical assemblies and mechanical engineering.
Particularly, this invention relates to air guides for motors, generators, and other electrical equipment, in general.
Specifically, this invention relates to modular air guides for electrical equipment.
BACKGROUND OF THE INVENTION:
An 'electrical rotating machine' or a 'rotating electrical machine' is any form of apparatus, equipment, or system which has a rotating member and generates, converts, transforms, or modifies electric power. These include apparatus such as a motor, generator, or synchronous converter.
Essentially all of the world's electric power is produced by rotating electrical generators, and about 70% of this energy is consumed in driving electric motors. Electric machines are electromechanical energy converters; generators convert mechanical energy into electrical energy and motors convert electrical energy into mechanical energy.
The performance of an 'electrical rotating machine' or a 'rotating electrical machine' is defined by many characteristics. One such characteristic is the cooling quotient and ability of the components of the machine. A motor includes a rotating element called the rotor and a stationary element called the stator. The stator &

rotor temperature needs to be kept in check for such electrical rotating machines. Efficient cooling of the stator & rotor is an imperative parameter which decides its enhanced working coefficients.
Hence, a fan is generally installed on the rotor shaft which enables the hot air to be directed away from the motor towards the atmosphere or towards the heat exchanger mechanism associated with the motor.
An air guide is installed, preferably, adjacent to the fan. The primary function of air guide, in electrical equipment, such as a motor or a generator, is to define the path of air from an external associated fan to the motor. The requirement of the air guide is determined by a plurality of factors which include fan, frame, core length, winding type, and the like. Every time a different combination of the factors occurs, a new air guide has to be designed, made, and used.
Hence, there is a need for a modular air guide i.e. modular arrangement of a single air guide which can be utilized in many combinations.
OBJECTS OF THE INVENTION:
An object of the invention is to provide a single air guide which caters to a plurality of variable fan parameters.
Another object of the invention is to provide a single, modular, size-variable air guide.
Yet another object of the invention is to provide a simple modular air guide.

SUMMARY OF THE INVENTION:
According to this invention, there is provided a modular air guide for electrical equipment, said air guide being an annular ring having a defined width between its inner diameter and its outer diameter, said defined width being a flat section between said inner diameter and said outer diameter, characterized in that, said flat section comprises at least an annular hinges concentric to said inner diameter and said outer diameter, said at least an annular hinges being enabled to collapse segments adjacent to said at least an hinge, thereby reducing the effective width of said guide in a collapsed configuration and increasing the effective width of said guide in a non-collapsed configuration.
According to this invention, there is also provided an electrical equipment with a modular air guide, said air guide being an annular ring having a defined width between its inner diameter and its outer diameter, said defined width being a flat section between said inner diameter and said outer diameter, characterized in that, said flat section comprises at least an annular hinges concentric to said inner diameter and said outer diameter, said at least an annular hinges being enabled to collapse segments adjacent to said at least an hinge, thereby reducing the effective width of said guide in a collapsed configuration and increasing the effective width of said guide in a non-collapsed configuration.
Preferably, said guide comprising multiple hinges and multiple segments, thereof, adjacent to each hinge, correspondingly, to provide multiple width sizes.

Preferably, said guide comprising an annularly dispersed locking means adapted to lock each of said hinges, independently, in their collapsed state or non-collapsed state.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 illustrates a complete structure of an air guide of the prior art;
Figure 2 illustrates a partial structure of an air guide of Figure 1; and
Figure 3 illustrates a sectioned view of an air guide of Figure 1.
The invention will now be described in relation to the accompanying drawings, in which:
Figure 4 illustrates a complete structure of a modular air guide; and
Figure 5" illustrates a sectioned view of a modular air guide.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
Figure 1 illustrates a complete structure of an air guide of the prior art. Figure 2 illustrates a partial structure of an air guide of Figure 1. Figure 3 illustrates a sectioned view of an air guide of Figure 1.

In normal practice, an air guide (100) is a single piece of Fibre-reinforced plastic (FRP) as per required dimension. The air guide, of the prior art, is an annular ring (12).
According to this invention, there is provided a modular air guide (200) for electrical equipment. According to this invention, there is also provided electrical equipment with a modular aid guide.
Figure 4 illustrates a complete structure of a modular air guide.
Figure 5 illustrates a sectioned view of a modular air guide.
In accordance with an embodiment of this invention, there is provided an annular ring having a defined width between the inner diameter (22) of the ring and the outer diameter (24) of the ring. The defined width is a flat section between the inner diameter and the outer diameter. This flat section comprises a plurality of annular hinges (26) concentric to the inner diameter and the outer diameter. These hinges are enabled to collapse the segments adjacent to the hinge. The collapsing ability of the adjacent segments reduces the effective width of the air guide. Having multiple hinges and multiple segments, thereof, provides multiple width sizes.
In accordance with another embodiment of this invention, there is an annularly dispersed locking means adapted to lock each of the hinges, independently, in their collapsed state or non-collapsed state.

Using the modular air guide of this invention, a single air guide can be used in a number of machines. Discretion of air can be altered in the same machine to adjust air discharge and direction .Also, costing will be improved with standard design.
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 modular air guide for electrical equipment, said air guide being an annular ring having a defined width between its inner diameter and its outer diameter, said defined width being a flat section between said inner diameter and said outer diameter, characterized in that, said flat section comprising at least an annular hinges concentric to said inner diameter and said outer diameter, said at least an annular hinges being enabled to collapse segments adjacent to said at least an hinge, thereby reducing the effective width of said guide in a collapsed configuration and increasing the effective width of said guide in a non-collapsed configuration.
2. A modular air guide as claimed in claim 1 wherein, said guide comprising multiple hinges and multiple segments, thereof, adjacent to each hinge, correspondingly, to provide multiple width sizes.
3. A modular air guide as claimed in claim 1 wherein, said guide comprising an annularly dispersed locking means adapted to lock each of said hinges, independently, in their collapsed state or non-collapsed state.
4. An electrical equipment with a modular aid guide, said air guide being an annular ring having a defined width between its inner diameter and its outer diameter, said defined width being a flat section between said inner diameter and said outer diameter, characterized in that, said flat section comprising at least an annular hinges concentric to said inner diameter and said outer diameter, said at least an annular hinges being enabled to collapse segments adjacent to said at least an hinge, thereby reducing the effective width of

said guide in a collapsed configuration and increasing the effective width of said guide in a non-collapsed configuration.
5. An electrical equipment as claimed in claim 1 wherein, said guide comprising multiple hinges and multiple segments, thereof, adjacent to each hinge, correspondingly, to provide multiple width sizes.
6. An electrical equipment as claimed in claim 1 wherein, said guide comprising an annularly dispersed locking means adapted to lock each of said hinges, independently, in their collapsed state or non-collapsed state.