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 segmented motor frame
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company.
INVENTOR
Sathe Mahesh of Crompton Greaves Ltd, Industrial Design Centre, Global R&D, Crompton Greaves, Kanjurmarg (East), 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 motofs.
Particularly, this invention relates to enclosures for motors. Specifically, this invention relates to a segmented motor frame
BACKGROUND OF THE INVENTION:
An electric motor converts electrical energy into mechanical energy. It contains three main components; stator, rotor, and commutator. The rotor is the non-stationary part of a rotary motor, which rotates because the wires and magnetic field of the motor are arranged so that a torque is developed about the rotor's axis. The stator is the stationary part of a rotor system. The commutator is a rotary electrical switch that periodically reverses the current direction between the rotor and the external circuit. The rotor has a fanning action.
A motor is typically enclosed in a motor frame or a motor enclosure. According to the prior art, the frame or the enclosure was produced by circular bending of a flat rectangular sheet of metal. Then, a process of seam welding was carried out at the joint to form the motor frame or motor enclosure.
This process required the inclusion of two more further operations; 1) removal of oval-ness of the frame or enclosure; and 2) internal grinding of seam projection on inner face of motor frame or motor enclosure. These were time consuming and expensive procedures.
The enclosures of frames of a motor are subject to the following conditions for

providing a safe and efficient housing:
1. stress levels due to the working of the motor i.e. the rotary motion of the rotor in the stator and weight of the stator and rotor;
2. excitation frequency of the rotor (in order to avoid resonance); and
3. temperature of operation of motor (due to heat dissipation).
It is important that the motor frame or motor enclosure be robust to take care of the above-mentioned conditions. It is simultaneously important that the robustness does not result in increase in weight of the frame.
OBJECTS OF THE INVENTION:
An object of the invention is to provide a motor frame or a motor enclosure which eliminates the procedures of oval-ness removal.
Another object of the invention is to provide a motor frame or a motor enclosure which eliminates the procedures of internal grinding of seam projection on its inner face
Yet another object of the invention is to provide a motor frame or a motor enclosure with impact protection offered.
Still another object of the invention is to provide a motor frame or a motor enclosure wherein junction box mounting flexibility is provided.
An additional object of the invention is to provide a motor frame or a motor enclosure wherein motor mounting flexibility is offered or provided.

Yet an additional object of the invention is to provide a motor frame or a motor enclosure wherein process cost reduction is achieved.
Still an additional object of the invention is to provide a motor frame or a motor enclosure such that there is ease of motor stator assembly.
Another additional object of the invention is to provide a motor frame or a motor enclosure which eliminates the need for a separate junction box.
SUMMARY OF THE INVENTION:
According to this invention, there is provided a segmented motor frame for enveloping a motor, said frame comprising:
- segmented pre-cast plates of a pre-defined curvature, in that, said plates being assembled end to end to form a substantially cylindrical motor frame.
Typically, said plates are curvilinear plates.
Preferably, said frame comprises three plates, each plate being defined by a curvature of 120 degrees.
Typically, each of said plate have its lateral end portions extending to form a Z-shaped extended bent portion which extends operatively outwards from said plate.
Typically, each of said plate have its lateral end portions extending to form a Z-shaped extended bent portion which extends operatively outwards from said plate, such that a pair of Z-shaped extended bent portions forms a foot for said frame.

We claim,
1. A segmented motor frame for enveloping a motor, said frame comprising:
segmented pre-cast plates of a pre-defined curvature, in that, said plates being assembled end to end to form a substantially cylindrical motor frame.
2. The segmented motor frame as claimed in claim 1, wherein said plates are curvilinear plates.
3. The segmented motor frame as claimed in claim 1, wherein said frame comprising three plates, each plate being defined by a curvature of 120 degrees.
4. The segmented motor frame as claimed in claim 1, wherein each of said plate having its lateral end portions extending to form a Z-shaped extended bent portion which extends operatively outwards from said plate.
5. The segmented motor frame as claimed in claim 1, wherein each of said plate having its lateral end portions extending to form a Z-shaped extended bent portion which extends operatively outwards from said plate, such that a pair of Z-shaped extended bent portions forms a foot for said frame.
6. The segmented motor frame as claimed in claim 1, wherein said frame comprising three feet.

7. The segmented motor frame as claimed in claim 1, wherein each of said plate having its lateral end portions extending to form a Z-shaped extended bent portion which extends operatively outwards from said plate, such that a pair of Z-shaped extended bent portions forms a foot for said frame, thereby forming a conduit between a pair of Z-shaped extended bent portions.
8. The segmented motor frame as claimed in claim 1, wherein each of said plate having its lateral end portions extending to form a Z-shaped extended bent portion which extends operatively outwards from said plate, such that a pair of Z-shaped extended bent portions forms a foot for said frame, thereby forming a conduit between a pair of Z-shaped extended bent portions, said conduit adapted to be used for holding a junction box or associated assembly of said motor.