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 centralizing fixture of flywheel for electrical generator assembly
APPLICANT(S):
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai -400 030, Maharashtra, India, an Indian Company
INVENTOR(S):
Sharma Mani Shankar and Singh Rajiv; both of Crompton Greaves Ltd., Machines (M7) Division, D-5 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 engineering and mechanical assemblies.
Particularly, this invention relates to equipment, devices, apparatus, and systems which use flywheel and specifically which involve flywheel mounting / dismounting.
Specifically, this invention relates to a centralizing fixture for flywheel.
More specifically, this invention relates to a centralizing fixture for flywheel for electrical generator assembly.
BACKGROUND OF THE INVENTION:
A flywheel is a rotating mechanical device that is used to store rotational energy. Flywheels have a significant moment of inertia and thus resist changes in rotational speed. The amount of energy stored in a flywheel is proportional to the square of its rotational speed. Energy is transferred to a flywheel by applying torque to it, thereby increasing its rotational speed, and hence its stored energy. Conversely, a flywheel releases stored energy by applying torque to a mechanical load, thereby decreasing its rotational speed.
Flywheel energy storage (FES) works by accelerating a rotor (flywheel) to a very high speed and maintaining the energy in the system as rotational energy. When energy is extracted from the system, the flywheel's rotational speed is reduced as a

consequence of the principle of conservation of energy; adding energy to the system correspondingly results in an increase in the speed of the flywheel. In electricity generation, an electrical generator is a device that converts mechanical energy to electrical energy. A generator forces electric charge (usually carried by electrons) to flow through an external electrical circuit. A flywheel is coupled to parts in an electrical generator in order to impart additional storage capabilities, thereby increasing the output capability of the electrical generator.
According to one embodiment of fixation of flywheel in an electrical generator, a flywheel is located with respect to a rotor shaft and a locking assembly on the rotor shaft. In this configuration, it is important that the flywheel be at a centralised location.
There is a need for a fixture or mechanism in order to mount / dismount flywheel of electrical generator from rotor shaft using self centering split locking assembly in order to ensure that flywheel is concentric with respect to the rotor shaft.
According to the prior art, flywheel was centralised using eyebolt and crane. An overhead crane was used to handle the flywheel while loosening the locking assembly bolts without any support from the bottom. Due to lack of fine motion control of crane in vertical and horizontal planes, the flywheel could not be positioned concentric to the rotor shaft, thereby resulting in non-uniform load on the bolts and further resulting in higher possibility of damage to the bolts in the locking assembly which can seize the locking assembly of the flywheel to the shaft. It resulted in neither totally horizontal nor totally vertical alignment. Moreover, if motor, itself, was tilted due to tilted floor conditions, corresponding tilting of

flywheel mount could not be achieved. This resulted in flywheel flipping and flywheel operating in oval configuration.
PRIOR ART:
The prior art document CN201703705U discloses a flywheel transporting bracket consists of V-shaped opening connected to a supporting frame. However, it does not disclose full load bearing of the flywheel or mounting the flywheel in a self-centralizing manner within a motor frame of reference.
OBJECTS OF THE INVENTION:
An object of the invention is to provide a fixture which supports a flywheel from a bottom surface allowing fine position control in vertical plane and self-centering in horizontal plane.
Another object of the invention is to centralize a flywheel with respect to 3-axes (X-axis, Y-axis, Z-axis).
Yet another object of the invention is to disallow / prevent oval mounting of flywheel with respect to motor where it needs to be installed.
Still another object of the invention is to mount flywheel of electrical generator from rotor shaft using self centering split locking assembly which ensures that flywheel is concentric with respect to the rotor shaft.
An additional object of the invention is to centralize flywheel with respect to shaft (of motor) and locking assembly which locks the flywheel on to the shaft of the motor.

Yet an additional object of the invention is to mount a flywheel using frame of reference of motor, thereby allowing accurate positioning and locating.
SUMMARY OF THE INVENTION:
According to this invention, there is provided a centralizing fixture for flywheel for electrical generator assembly, said fixture being a base platform with a plurality of dynamic support means extending from bottom surface of said base platform, said base platform further comprising a V-shaped operative top surface adapted to provide tangential support to the flywheel from its operative lower side(s), each of said dynamic support means being adjustable lead screws with thrust bearing capability adapted to independently adjust height of said fixture such that said flywheel tangentially touches the inclined planes of said V-shaped operative top surface, thereby provisioning ease of alignment of flywheel for mounting in a centralised position, within the motor frame of reference, with respect to 3-axes (X-axis, Y-axis, Z-axis).
Typically, said base platform comprises a V-shaped operative top surface, said Vr shaped operative top surface comprises two inclined planes adapted to meet at a line running through said operative top surface.
Typically, said dynamic support means are multiple bearings adapted to support full load of flywheel from bottom.
Typically, said dynamic support means comprises corresponding adjustment means adapted to adjust each of said dynamic support means in order to add or deduct height of said base platform at its placed location.

Typically, said dynamic support means are 4 dynamic support means adapted to support said base platform from 4 corners.
According to this invention, there is also provided a method for centralizing flywheel for electrical generator assembly using centralizing fixture of claim 1, said method comprises the steps of:
a. mounting locking assembly on motor shaft of said electrical generator
assembly;
b. mounting flywheel, using a crane, on to said motor shaft;
c. removing said crane;
d. placing said centralizing fixture below said flywheel;
e. resting flywheel on locking assembly and on said centralizing fixture;
f. defining gap between flywheel and locking assembly;
g. adjusting said dynamic support means from the bottom of said centralizing
fixture so that tangential support is extended to said flywheel (from all sides);
and
h. using a feeler gauge in order to determine that said pre-defined gap between flywheel and locking assembly is ensured, thereby achieving apt centralization in all axes (X-axis, Y-axis, and Z-axis).
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
This invention will now be described in relation to the accompanying drawings, in which:
Figure 1 a illustrates a front view of a centralizing fixture along with flywheel;

Figure lb illustrates a side view of a centralizing fixture along with flywheel; Figure 2a illustrates a front view of a centralizing fixture without flywheel; and Figure 2b illustrates a front view of a centralizing fixture without flywheel.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
According to this invention, there is provided a centralizing fixture for flywheel for electrical generator assembly.
Figure la illustrates a front view of a centralizing fixture along with flywheel.
Figure lb illustrates a side view of a centralizing fixture along with flywheel.
Figure 2a illustrates a front view of a centralizing fixture without flywheel.
Figure 2b illustrates a front view of a centralizing fixture without flywheel.
In accordance with an embodiment of this invention, there is provided a base platform (12) with a plurality of dynamic support means (14) extending from the bottom surface of the base platform. The base platform comprises a V-shaped operative top surface (16). This V-shaped operative top surface comprises two inclined planes (16a, 16b) adapted to meet at a line (16c) running through the operative top surface. This fixture is adapted to support the flywheel from the bottom surface allowing fine allowing fine position control in vertical plane and self-centering in horizontal plane.

The V-shaped operative top surface is adapted to provide tangential support to the flywheel (20) at its operative lower side.
In accordance with an embodiment of this invention, the dynamic support means (14) are lead screws with thrust bearing capability. These dynamic support means are multiple bearings capable of supporting the full load of the flywheel from the bottom. The V-shaped surface mounted on multiple bearings is capable of supporting the full load of the flywheel from the bottom. Fine adjustment of movement of lead screw over the bearing, at each of the four legs, of the fixture ensures that the V-shaped surface, in contact with the flywheel, positions it over the locking bolts with fine accuracy. According to one embodiment, there are 4 dynamic support means to support the base platform from 4 corners. There are adjustment means adapted to adjust the dynamic support means such that it imparts / adds or reduces / deducts height to the base platform, in general, in order to ensure that tangential support is extended to the flywheel.
In order to mount the flywheel, the following steps are performed:
a. locking assembly is mounted on motor shaft;
b. with crane, flywheel is mounted on the motor shaft (no locking);
c. crane is removed;
d. V-shaped platform / block (of this invention) is placed below the flywheel;
e. flywheel rests on locking assembly and V-shaped platform / block;
f. balancing (for centralization) needs to be done in 3-axes (X-axis, Y-axis, and
Z-axis);
g. gap between flywheel and locking assembly is pre-defined (about 1 mm);

h. 4 lead screws with thrust bearing and adjustment capabilities are provided at the bottom of the V-shaped platform / block, using which the V-shaped platform / block can be adjusted so that tangential support is extended to the flywheel (from all sides); and
i. using a feeler gauge, the pre-defined gap (of about 1 mm) between flywheel and locking assembly is ensured - this ensures apt centralization in all axes.
The V-shaped surface ensures alignment of the flywheel in the horizontal plane with respect to the rotor shaft. Fine adjustment of movement of lead screw over the bearing at each of the four legs of the fixture ensures that the V-shaped surface in contact with the flywheel positions it over the locking bolts with fine accuracy. This ensures uniform load distribution on all bolts of the locking assembly facilitating easy loosening of the bolts from the locking assembly and dismounting of the flywheel without bolt damage.
The Technical Advancement of this invention lies in provisioning ease of alignment of flywheel for mounting in a centralised position with respect to 3-axes (X-axis, Y-axis, Z-axis).
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 centralizing fixture for flywheel for electrical generator assembly, said fixture being a base platform with a plurality of dynamic support means extending from bottom surface of said base platform, said base platform further comprising a V-shaped operative top surface adapted to provide tangential support to the flywheel from its operative lower side(s), each of said dynamic support means being adjustable lead screws with thrust bearing capability adapted to independently adjust height of said fixture such that said flywheel tangentially touches the inclined planes of said V-shaped operative top surface, thereby provisioning ease of alignment of flywheel for mounting in a centralised position, within the motor frame of reference, with respect to 3-axes (X-axis, Y-axis, Z-axis).
2. The centralizing fixture for flywheel as claimed in claim 1 wherein, said base platform comprising a V-shaped operative top surface, said V-shaped operative top surface comprising two inclined planes adapted to meet at a line running through said operative top surface.
3. The centralizing fixture for flywheel as claimed in claim 1 wherein, said dynamic support means are multiple bearings adapted to support full load of flywheel from bottom.
4. The centralizing fixture for flywheel as claimed in claim 1 wherein, said dynamic support means comprising corresponding adjustment means adapted to adjust each of said dynamic support means in order to add or deduct height of said base platform at its placed location.

5. The centralizing fixture for flywheel as claimed in claim 1 wherein, said dynamic support means are 4 dynamic support means adapted to support said base platform from 4 corners.
6. A method for centralizing flywheel for electrical generator assembly using centralizing fixture of claim 1, said method comprising the steps of:
a. mounting locking assembly on motor shaft of said electrical generator
assembly;
b. mounting flywheel, using a crane, on to said motor shaft;
c. removing said crane;
d. placing said centralizing fixture below said flywheel;
e. resting flywheel on locking assembly and on said centralizing fixture;
f. defining gap between flywheel and locking assembly;
g. adjusting said dynamic support means from the bottom of said
centralizing fixture so that tangential support is extended to said flywheel
(from all sides); and
h. using a feeler gauge in order to determine that said pre-defined gap between flywheel and locking assembly is ensured, thereby achieving apt centralization in all axes (X-axis, Y-axis, and Z-axis).