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 multi-assembly for use in motors
APPLICANTS :
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR (S):
Das Mukul, 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 mechanical assemblies.
Particularly, this invention relates to of a multi-assembly for use in motors.
Background of the Invention:
Totally Enclosed Tube Ventilated (TETV) Motors in Squirrel Cage (SCR) and Slip Ring (SR) designs that provide excellent performance in the most demanding environments and load conditions. The TV Series represents TETV motors that are most suitable for extreme dusty, humid and polluted atmospheres. TV Series Motors are used in industries such as Cement, Steel, Rubber, Paper, Refineries, Petrochemical and Fertilizer units as well as Power Generation plants.
Figure 1 illustrates a schematic TETV motor.
The inside air of the motor is circulated from inside of motor to the space (or shell) which houses tubes. The heat of inside air is transferred to the tubes by conduction process the outside air is forced through these tubes by fans (12) mounted on outside portion of the motor. The transfer of heat through these tubes is by process of convection. A stator (14) and rotor (16) is located about a shaft (11) in a motor housing (20).
The two internal fans (18) circulate the internal between rotor and wound stator, while external fan (12) takes surrounding outside air and pushes through the cooling tubes housed in the motor housing. Air guides (24) are provided near the internal fans (18). The external fan (12) is mounted over a fan mounting plate (15)

supported by an external fan hub (17). The external fan (12) is located in the fan casing (17) on the non drive-end and forces the open-circuit air through the cooling tubes of the stator (14) frame. Reference numeral 29 refers to an end ring.
An end shield (26, 27) placed over a bearing (28) forms the lateral enclosure for the motor. The end shields (26, 27) are designed for fitting the bearing assembly (28) and take care for transmitting the static and dynamic load. Depending on the design and the operating conditions, the motors are fitted with grease lubricated rolling element bearings (28). Reference numeral 26 refers to an end shield of the non drive end.
There is also provided a flange (30) adapted to allow fixation of the motor with any external customer equipment.
Observing the various sources of vibrations and related motors, the components of an end shield (26) of non-drive end, flange (30), and fan cover (17) require tightening and hence, their loosening over a period of time results in vibration and noise.
Hence, there is a need for a better assembly.
Prior Art:
US3748507 discloses a Variable speed drive having enhanced ventilation. It discloses a variable speed drive, wherein the end shield at the end of the motor remote from said transmission tapers axially toward said rotor with decreased radial span of the end shield from the rotor

However, there a multi-assembly or any means or method to dampen noise and vibrations is not disclosed.
JP54038503 discloses a Bearing cooling system for electric rotary machine.
It mentions that the end cover, the encoder cover, and the fan duct cooperatively
define an airflow space communicating with the airflow passages of the enclosure.
However, issues relating to vibration and noise are not resolved by the use of this
system.
Objects of the Invention:
An object of the invention is to reduce vibration and noise occurring due to an end shield.
Another object of the invention is to reduce vibration and noise occurring due to a flange.
Yet another object of the invention is to reduce vibration and noise occurring due to a fan cover.
Summary of the Invention:
According to this invention, there is provided a multi-assembly for use in motors,
said multi-assembly comprises:
a. first annular plate and a second annular plate parallel to said first annular plate and spaced apart from said second annular plate, said second annular plate having a relatively smaller diameter with respect to said first annular plate;

b. third annular plate concentric to said first annular plate and adapted to be
surrounded by the ring of said first annular plate, said third annular plate having
a relatively smaller diameter with respect to said second annular plate;
c. first set of radially dispersed support elements between said first annular plate
and said spaced apart second annular plate, thereby forming an external support
for said multi-assembly; and
d. second set of radially dispersed support elements between said first annular
plate and said concentric third annular plate, thereby forming an internal
support for said multi-assembly;
wherein said first annular plate, said second annular plate, and said third annular plate are co-axial plates.
Typically, said first annular plate is a fan cover ring for said motor.
Typically, said second annular plate is a flange for said motor.
Typically, said third annular plate is an end shield for said motor.
Typically, said multi-assembly includes a wire mesh in the space between said first annular plate and said spaced apart second annular plate.
Brief Description of the Accompanying Drawings:
The invention will now be described in relation to the accompanying drawings, in which:
Figure 2 illustrates an isometric view of a multi-assembly for use in motors;

Figure 3 illustrates a back view of a multi-assembly for use in motors; Figure 4 illustrates a front view of a multi-assembly for use in motors; and
Figure 5 illustrates a side view of a multi-assembly for use in motors.
Detailed Description of the Accompanying Drawings:
According to this invention, there is provided a multi-assembly (50) for use in motors. The use typically replicates the use of a separate end shield, the flange, the fan cover; in a collaborative fashion.
In accordance with an embodiment of this invention, there is provided a first annular plate (51) and a second annular plate (52) parallel to said first annular plate (51). The second annular plate (52) has relatively smaller diameter with respect to the first annular plate (51). The second annular plate (52) is spaced apart from the first annular plate (51).
In accordance with another embodiment of this invention, there is provided a third annular plate (53). The first annular plate (51), the second annular plate (52), and the third annular plate (53) are co-axial plates. The third annular plate (53) has relatively smaller diameter with respect to the second annular plate (52). The third annular plate (53) is concentric to the first annular plate (51), i.e. the ring of the first annular plate (51) surrounds the circumference of the third annular plate (53) in a spaced apart manner.

The first annular plate (51) works as a fan cover for the motor as explained in Figure 1.
The second annular plate (52) works as a flange for the motor as explained in Figure 1.
The third annular plate (53) works as an end shield for the motor as explained in Figure 1.
The original cover (15), the original flange (30), and the original end shield (26) are thus replaced by the multi-assembly (50).
In accordance with yet another embodiment of this invention, there is provided a first set of radially dispersed support elements (54) between said first annular plate (51) and said spaced apart second annular plate (52). These first set of radially dispersed support elements (54) are the external support for said multi-assembly (50).
In accordance with yet another embodiment of this invention, there is provided a second set of radially dispersed support elements (55) between said first annular plate (51) and said concentric third annular plate (53). These second set of radially dispersed support elements (55) are the internal support for said multi-assembly (50).
In accordance with still another embodiment of this invention, there is provided a wire mesh (56) in the space between said first annular plate (51) and said spaced apart second annular plate (52). This mesh is for purposes of safety.

This fused construction covers all the three components in a single multi-assembly part and overcomes the problem of tightening them separately. Consequently, it also resolves the problems of noise and vibration in motors.
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 multi-assembly for use in motors, said multi-assembly comprising:
a. first annular plate and a second annular plate parallel to said first annular plate
and spaced apart from said second annular plate, said second annular plate
having a relatively smaller diameter with respect to said first annular plate;
b. third annular plate concentric to said first annular plate and adapted to be
surrounded by the ring of said first annular plate, said third annular plate
having a relatively smaller diameter with respect to said second annular plate;
c. first set of radially dispersed support elements between said first annular plate
and said spaced apart second annular plate, thereby forming an external
support for said multi-assembly; and
d. second set of radially dispersed support elements between said first annular
plate and said concentric third annular plate, thereby forming an internal
support for said multi-assembly;
wherein said first annular plate, said second annular plate, and said third annular plate are co-axial plates.
2. A multi-assembly as claimed in claim 1 wherein, said first annular plate is a fan cover ring for said motor.
3. A multi-assembly as claimed in claim 1 wherein, said second annular plate is a flange for said motor.
4. A multi-assembly as claimed in claim 1 wherein, said third annular plate is an end shield for said motor.

5. A multi-assembly as claimed in claim 1 wherein, said multi-assembly includes a wire mesh in the space between said first annular plate and said spaced apart second annular plate.