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
Ventilation mechanisms for heat generating totally enclosed rotating equipment
APPLICANT (S)
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR (S)
Bhatia Dinesh of Crompton Greaves Ltd, Analytics Centre, C G Global R&D Centre, Bhaskara building, Kanjurmarg (E), Mumbai - 400042, Maharashtra, 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 engineering and fluid dynamics.
Particularly, this invention relates to ventilating arrangements for totally enclosed motors, generators, or such heat generating electrical equipment.
Specifically, this invention relates to ventilation mechanisms for heat generating totally enclosed rotating 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, alternator, synchronous converter or the like.
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 machine1 or a 'rotating electrical machine' is defined by many characteristics. One such characteristic is the cooling quotient and cooling ability of the components of the machine. In a motor, the rotor temperature needs to be kept in check for such electrical rotating machines.

Efficient cooling of the rotor is an imperative parameter which decides its
enhanced working coefficients.
In totally enclosed motors or generators or electrical equipment, there is little of no
space inside the enclosure for providing a fan or the like cooling equipment or
apparatus.
Hence, there is a need for a system, mechanism, design, and arrangement which induces efficient and improved heat dissipating characteristics, thereby resulting in improved performance and also provides internal cooling.
According to prior art mechanisms and designs, a relatively small fan is installed inside of the electrical rotating apparatus for providing cooling and further cooling is provided by drilling straight holes not exceeding 30mm in diameter due to restrictions imposed by standards.
The small space, on the inside, restricts the size of the fan and hence provides less flow rate for improving the heat transfer. The straight holes, by themselves, are not efficient enough to improve heat transfer. This improper cooling arrangement causes very less heat transfer and the temperature rises in the internal heat generating equipment is quite high. If a fan is located on the inner side, problems can arise due to fan melting and also rotor jamming due to fan breakage can occur.
Hence, there is a need for mechanisms for heat generating totally enclosed equipment which obviate the limitations of the prior art.

OBJECTS OF THE INVENTION
An object of the invention is to provide an 'electrical rotating machine' or a
'rotating electrical machine' with improved heat absorbing or heat dissipating
characteristics.
Another object of the invention is to provide an 'electrical rotating machine' or a
'rotating electrical machine' with improved heat absorbing or heat dissipating
characteristics, thereby resulting in better cooling of the machine.
Yet another object of the invention is to provide enhanced cooling of axially ventilated 'electrical rotating machine' or a 'rotating electrical machine'.
Still another object of the invention is to improve the ventilation capabilities of axially ventilated 'electrical rotating machine' or a 'rotating electrical machine'.
An additional object of the invention is to increase amount of air flowing through the periphery of rotor in axially ventilated 'electrical rotating machine' or a 'rotating electrical machine'.
Yet an additional object of the invention is to reduce the amount of air that is not properly used for heat dissipation in axially ventilated 'electrical rotating machine' or a 'rotating electrical machine'.
Still an additional object of the invention is to provide efficient suction holes for entry of external air in axially ventilated 'electrical rotating machine' or a 'rotating electrical machine'.

Another additional object of the invention is to provide efficient ventilation holes for exit of hot air from axially ventilated 'electrical rotating machine' or a 'rotating electrical machine'.
Yet another additional object of the invention is to provide improved fluid flow for cooling or ventilation in an 'electrical rotating machine' or a 'rotating electrical machine'.
SUMMARY OF THE INVENTION
According to this invention, there is provided a ventilation mechanism for cooling a heat generating totally enclosed rotating equipment, having at least an disk-shaped end shield, said ventilation mechanism comprises:
a. plurality of angled suction holes, radially dispersed, on each of said end shields
for aiding input of air from the atmosphere into said equipment, said angle
being defined by an angle of drill in a direction being against the direction of
rotation of said equipment from outer side of said end shield to its inner side;
and
b. plurality of ventilation holes, radially dispersed, on each of said end shields for
aiding output of air from said equipment to the atmosphere, the radius of
dispersion of ventilation holes being higher than radius of dispersion of suction
holes.
According to this invention, there is also provided an enclosed rotating equipment with a ventilation mechanism for cooling a heat generating totally enclosed rotating equipment, having at least an disk-shaped end shield, said ventilation mechanism comprises:
i. plurality of angled suction holes, radially dispersed, on each of said end shields for aiding input of air from the atmosphere into said equipment, said angle

being defined by an angle of drill in a direction being against the direction of rotation of said equipment from outer side of said end shield to its inner side; and ii. plurality of ventilation holes, radially dispersed, on each of said end shields for aiding output of air from said equipment to the atmosphere, shields the radius of dispersion of ventilation holes being higher than radius of dispersion of suction holes.
Typically, said mechanism comprises angled suction holes such that if the end shield is held operatively vertically and its direction of rotation is anti-clockwise, the angle of drill of each of the suction holes is in a clockwise direction from outer side of end shields to the inner side.
Alternatively, said mechanism comprises angled suction holes such that if the end shield is held operatively vertically and its direction of rotation is clockwise, the angle of drill of each of the suction holes is in an anti-clockwise direction from outer side of end shields to the inner side.
Typically, said mechanism comprises angled suction holes being equi-angularly dispersed about the central axis of each of said end shields.
Preferably, the angle of drill, for said angled suction holes, is up to 60 degrees with respect to the operative horizontal surface of the end shield.
Typically, said mechanism comprises ventilation holes which are straight ventilation holes.

Alternatively, said mechanism comprises ventilation holes which are angled ventilation holes, said angle being defined by an angle of drill from outwards to inwards, and from radially upward location to a radially downward location, with respect to the axis of rotation of said equipment.
Typically, said mechanism comprises tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole.
Preferably, said mechanism comprises tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding, hole, said varves further beirrg, curviimear varves,.
Preferably, said mechanism comprises tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said angle being about 45 degrees to 50 degrees.
Preferably, said mechanism comprises tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar

to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said vanes being about 30-40 mm length.
According to this invention, there is further provided a ventilation mechanism for cooling a heat generating totally enclosed rotating equipment, having at least a disk-shaped end shield, said ventilation mechanism comprises:
a. plurality of suction holes, radially dispersed, on each of said end shields for
aiding input of air from the atmosphere into said equipment; and
b. plurality of angled ventilation holes, radially dispersed, on each of said end
shields for aiding output of air from said equipment to the atmosphere, said
angle being defined by an angle of drill from outwards to inwards, and from
radially upward location to a radially downward location, with respect to the
axis of rotation of said equipment.
According to this invention, there is further also provided an enclosed rotating equipment with a ventilation mechanism for cooling a heat generating totally enclosed rotating equipment, having at least an disk-shaped end shield, said ventilation mechanism comprises: i. plurality of suction holes, radially dispersed, on each of said end shields for
aiding input of air from the atmosphere into said equipment; and ii. plurality of angled ventilation holes, radially dispersed, on each of said end shields for aiding output of air from said equipment to the atmosphere, said angle being defined by an angle of drill from outwards to inwards, and from radially upward location to a radially downward location, with respect to the axis of rotation of said equipment.

Typically, said mechanism comprises plurality of angled suction holes, radially dispersed, on each of said end shields for aiding input of air from the atmosphere into said equipment, said angle being defined by an angle of drill in a direction being against the direction of rotation of said equipment.
Typically, said mechanism comprises plurality of straight suction holes, radially dispersed, on each of said end shields for aiding input of air from the atmosphere into said equipment.
Typically, said mechanism comprises tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole.
Typically, said mechanism comprises tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said vanes further being curvilinear vanes.
Typically, said mechanism comprises tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said angle being about 45 degrees to 50 degrees.

Typically, said mechanism comprises tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said vanes being about 30-40 mm length.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The invention will now be described in relation to the accompanying drawings, in
which:
Figure 1 illustrates a complete isometric view of a rotating electrical equipment
such as a rotor with end shields and equipped with the ventilation mechanism for
heat generating totally enclosed rotating equipment;
Figure 2 illustrates another isometric view of a rotor with end shields and equipped with the ventilation mechanism for heat generating totally enclosed rotating equipment;
Figure 3 illustrates a cut-section view of a rotor of Figure 1 which depicts the ventilation mechanism for heat generating totally enclosed rotating equipment, specifically depicting the cut-section of the ventilation holes; Figure 4 illustrates a cut-section view of a rotor of Figure 1 which depicts the ventilation mechanism for heat generating totally enclosed rotating equipment, specifically depicting the cut-section of the suction holes; and
Figure 5 illustrates a cut-section view of the ventilation holes depicting the air flow out from the rotor to the atmosphere and the angle of drill of the ventilation holes.

DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
According to this invention, there is provided a ventilation mechanism for heat generating totally enclosed rotating equipment.
Figure 1 illustrates a complete isometric view of a rotating electrical equipment such as a rotor with end shields and equipped with the ventilation mechanism for heat generating totally enclosed rotating equipment.
Figure 2 illustrates another isometric view of a rotor with end shields and equipped with the ventilation mechanism for heat generating totally enclosed rotating equipment.
Figure 3 illustrates a cut-section view of a rotor of Figure 1 which depicts the ventilation mechanism for heat generating totally enclosed rotating equipment, specifically depicting the cut-section of the ventilation holes.
Figure 4 illustrates a cut-section view of a rotor of Figure 1 which depicts the
ventilation mechanism for heat generating totally enclosed rotating equipment,
specifically depicting the cut-section of the suction holes.
In a rotating electrical equipment, a rotating element such as a rotor is flanked by
end shields (12 14), on either sides along the rotating axis (X-X'). The end shields,
too, rotate along with the rotating element. The end shields, typically, are round
disk elements.
In accordance with an embodiment of this invention, there are provided a plurality
of suction holes (20), radially dispersed, on each of said end shields. The suction
holes aid in input of air from the atmosphere into the rotating element flanked by
the end shields. According to this invention, the suction holes are angled suction

holes. The angle of drill of the suction holes is in a direction which is against the direction of rotation of the end shield. I.e. if the end shield is held operatively vertically and its direction of rotation is anti-clockwise, the angle of drill of each of the suction holes is in a clockwise direction and if the direction of rotation is clockwise, the angle of drill of each of the suction holes is in an anti-clockwise direction. The angle of drill provides a channel conducive for fluid flow so that the fluid (air) can enter the rotating element with relative ease and fluidity. The suction holes are equi-angularly dispersed about the central axis of each of said end shields.
The 'angle of drill' is the angle at which a drill is used to create a hole in a plate of pre-defined thickness. While drilling each hole through a plate of a pre-defined thickness, an upper substantially circular hole is formed and a lower substantially circular hole is formed. If the angle of drill is perpendicular to the plate, then the upper hole and the lower hole coincide in their respective axes. However, if the angle of drill is other than a right angle, the upper hole is offset with respect to the lower hole in terms of respective angles of axes.
Typically, the angle of drill, for the suction holes, is up to 60 degrees with respect to the operative horizontal surface of the end shield.
In accordance with another embodiment of this invention, there are provided tilted vanes (30) for suction holes. The vanes are elongate protrusion bodies which overlook and protrude over the suction holes in a tilted manner. The tilted vanes are angled in the direction of the angle of drill of the suction holes such that the top end of the vane overlooks the corresponding hole. These vanes further guide fluid flow so that the fluid (air) can enter the rotating element with relative ease and

fluidity. Preferably, each of the vanes are curvilinear vanes, in that, each vane is made of a curved sheet.
Typically, the angle of tilt of the vanes is 45 degrees to 50 degrees. Typically, the vanes are of 30-40 mm length although they can be increased or decreased in size depending on the design constraints and the flow requirement.
The introduction of angles holes and tilted vanes tilted in a direction opposite to the direction of rotation creates the suction effect inducing the flow into the rotating electrical equipment.
There is a correlation between the number of suction holes and the number of vanes. The number of suction holes can be increased if the angle of vanes at each suction hole is reduced. More the number of suction holes, lesser the angle of tilt of each vane.
In accordance with yet another embodiment of this invention, there are provided a plurality of ventilation holes (40), radially dispersed, on each of said end shields. The radius of dispersion of ventilation holes is higher than radius of dispersion of suction holes. The ventilation holes aid in output of air from the rotating element, flanked by the end shields, to the atmosphere. According to this invention, the ventilation holes may be straight ventilation holes or may be angled ventilation holes. The angle of drill of the ventilation holes is from outwards to inwards, and upwards to downwards, with respect to the axis of rotation of the end shields. This is the negative radial direction for the angle off drill.
Each of the ventilation holes and suction holes can be of any diameter permitted by structural strength limits and standards.

Figure 5 illustrates a cut-section view of the ventilation holes depicting the air flow out from the rotor to the atmosphere and the angle of drill of the ventilation holes. The arrows depict the path of air flow as output from the rotating equipment to the atmosphere.
Since this invention consists of simple holes, drilled angularly, combined with vanes which are located on the outside, their replacement becomes easy and any problems caused due to breakage of vanes, if any, are eliminated. These are low torque solutions and hence power consumption is quite small and flow induction is better as compared to a fan.
Further, since the vanes are located on the outside where temperatures are relatively lesser, problems of melting are reduced and hence materials like nylon/plastic can be used to manufacture the vanes reducing the cost and improving the manufacturability of such shapes.
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 ventilation mechanism for cooling a heat generating totally enclosed
rotating equipment, having at least an disk-shaped end shield, said ventilation mechanism comprising:
a. plurality of angled suction holes, radially dispersed, on each of said end
shields for aiding input of air from the atmosphere into said equipment,
said angle being defined by an angle of drill in a direction being against
the direction of rotation of said equipment from outer side of said end
shield to its inner side; and
b. plurality of ventilation holes, radially dispersed, on each of said end
shields for aiding output of air from said equipment to the atmosphere,
shields the radius of dispersion of ventilation holes being higher than
radius of dispersion of suction holes.
2. A ventilation mechanism as claimed in claim 1 wherein, said mechanism
comprising angled suction holes such that if the end shield is held operatively vertically and its direction of rotation is anti-clockwise, the angle of drill of each of the suction holes is in a clockwise direction from outer side of end shields to the inner side.
3. A ventilation mechanism as claimed in claim 1 wherein, said mechanism comprising angled suction holes such that if the end shield is held operatively vertically and its direction of rotation is clockwise, the angle of drill of each of the suction holes is in an anti-clockwise direction from outer side of end shields to the inner side.

4. A ventilation mechanism as claimed in claim 1 wherein, said mechanism comprising angled suction holes being equi-angularly dispersed about the central axis of each of said end shields.
5. A ventilation mechanism as claimed in claim 1 wherein, the angle of drill, for said angled suction holes, is up to 60 degrees with respect to the operative horizontal surface of the end shield.
6. A ventilation mechanism as claimed in claim 1 wherein, said mechanism comprising ventilation holes which are straight ventilation holes.
7. A ventilation mechanism as claimed in claim 1 wherein, said mechanism comprising ventilation holes which are angled ventilation holes, said angle being defined by an angle of drill from outwards to inwards, and from radially upward location to a radially downward location, with respect to the axis of rotation of said equipment.
8. A ventilation mechanism as claimed in claim 1 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole.
9. A ventilation mechanism as claimed in claim 1 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction

holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said vanes further being curvilinear vanes.
10. A ventilation mechanism as claimed in claim 1 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said angle being about 45 degrees to 50 degrees.
11. A ventilation mechanism as claimed in claim 1 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said vanes being about 30-40 mm length.
12. A ventilation mechanism for cooling a heat generating totally enclosed rotating equipment, having at least an disk-shaped end shield, said ventilation mechanism comprising:
plurality of suction holes, radially dispersed, on each of said end shields for aiding input of air from the atmosphere into said equipment; and

plurality of angled ventilation holes, radially dispersed, on each of said end shields for aiding output of air from said equipment to the atmosphere, said angle being defined by an angle of drill from outwards to inwards, and from radially upward location to a radially downward location, with respect to the axis of rotation of said equipment.
13. A ventilation mechanism as claimed in claim 12 wherein, said mechanism comprising plurality of angled suction holes, radially dispersed, on each of said end shields for aiding input of air from the atmosphere into said equipment, said angle being defined by an angle of drill in a direction being against the direction of rotation of said equipment.
14. A ventilation mechanism as claimed in claim 12 wherein, said mechanism comprising plurality of straight suction holes, radially dispersed, on each of said end shields for aiding input of air from the atmosphere into said equipment.
15. A ventilation mechanism as claimed in claim 12 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole.
16. A ventilation mechanism as claimed in claim 12 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction

holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said vanes further being curvilinear vanes.
17. A ventilation mechanism as claimed in claim 12 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said angle being about 45 degrees to 50 degrees.
18. A ventilation mechanism as claimed in claim 12 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said vanes being about 30-40 mm length.
19. An enclosed rotating equipment with a ventilation mechanism for cooling a heat generating totally enclosed rotating equipment, having at least an disk-shaped end shield, said ventilation mechanism comprising:
i. plurality of angled suction holes, radially dispersed, on each of said end shields for aiding input of air from the atmosphere into said equipment, said angle being defined by an angle of drill in a direction being against

the direction of rotation of said equipment from outer side of said end shield to its inner side; and ii. plurality of ventilation holes, radially dispersed, on each of said end shields for aiding output of air from said equipment to the atmosphere, shields the radius of dispersion of ventilation holes being higher than radius of dispersion of suction holes.
20. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 19 wherein, said mechanism comprising angled suction holes such that if the end shield is held operatively vertically and its direction of rotation is anti-clockwise, the angle of drill of each of the suction holes is in a clockwise direction from outer side of end shields to the inner side.
21. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 19 wherein, said mechanism comprising angled suction holes such that if the end shield is held operatively vertically and its direction of rotation is clockwise, the angle of drill of each of the suction holes is in an anti-clockwise direction from outer side of end shields to the inner side.
22. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 19 wherein, said mechanism comprising angled suction holes being equi-angularly dispersed about the central axis of each of said end shields.
23. An enclosed rotating equipment with a ventilation mechanism as claimed
in claim 19 wherein, the angle of drill, for said angled suction holes, is up

to 60 degrees with respect to the operative horizontal surface of the end shield.
24. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 19 wherein, said mechanism comprising ventilation holes which are straight ventilation holes.
25. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 19 wherein, said mechanism comprising ventilation holes which are angled ventilation holes, said angle being defined by an angle of drill from outwards to inwards, and from radially upward location to a radially downward location, with respect to the axis of rotation of said equipment.
26. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 19 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole.
27. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 19 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said vanes further being curvilinear vanes.

28. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 19 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said angle being about 45 degrees to 50 degrees.
29. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 19 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said vanes being about 30-40 mm length.
30. An enclosed rotating equipment with a ventilation mechanism for cooling a heat generating totally enclosed rotating equipment, having at least an disk-shaped end shield, said ventilation mechanism comprising: plurality of suction holes, radially dispersed, on each of said end shields for aiding input of air from the atmosphere into said equipment; and plurality of angled ventilation holes, radially dispersed, on each of said end shields for aiding output of air from said equipment to the atmosphere, said angle being defined by an angle of drill from outwards to inwards, and from radially upward location to a radially downward location, with respect to the axis of rotation of said equipment.

31. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 30 wherein, said mechanism comprising plurality of angled suction holes, radially dispersed, on each of said end shields for aiding input of air from the atmosphere into said equipment, said angle being defined by an angle of drill in a direction being against the direction of rotation of said equipment.
32. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 30 wherein, said mechanism comprising plurality of straight suction holes, radially dispersed, on each of said end shields for aiding input of air from the atmosphere into said equipment.
33. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 30 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole.
34. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 30 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said vanes further being curvilinear vanes.

35. An enclosed rtating equipment with a ventilation mechanism as claimed in claim 30 wherein, said mechanism comprising tilted vanes for each of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said angle being about 45 degrees to 50 degrees.
36. An enclosed rotating equipment with a ventilation mechanism as claimed in claim 30 wherein, safcf mecriani'sm comprising tilted vanes for eacn of said suction holes, said vanes being elongate protrusion bodies which overlook and protrude over said suction holes in a tilted manner, said tilted vanes being angled in a direction similar to angle of drill of said suction holes such that the top end of said vane overlooks the corresponding hole, said vanes being about 30-40 mm length.