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 motor and motor frame with increased heat dissipation
APPLICANTS :
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR (S):
Khatua Satyaranjan, of Crompton Greaves Ltd, machine (Ml) 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 the field of motors.
Particularly, this invention relates to the field of flameproof motors.
More particularly, this invention relates to a motor and motor frame with increased heat dissipation.
Background of the Invention:
A motor for electrical purposes, i.e. an electric motor, is a device which converts electrical energy to mechanical energy. For industrial use, the ratings of motor may typically be very high. They may be placed in housings or frames. It contains two main components; stator and rotor. 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 rotor has a fanning action.
The external circuit of the motor relates to the exterior of the motor housing. The internal circuit of the motor relates to the interior of the motor housing.
In a flameproof motor, cooling in the internal circuit was only by churning of air. So for dissipation of heat of the motor, circulation of air inside the motor is not available. Due to lesser heat dissipation, the motors are derated to high extent.
In the motor and motor frame of the prior art, there was no circulation path for air in the earlier motor and motor frame. There was no circulation path by which internal heat could be transferred to the surface. Hence, hot air was circulated,

inadvertently, in the motor and motor housing, itself. Hence, heat dissipation was less. Improper or insufficient heat dissipation may lead to stresses in the motor housing,
Hence, there is a need to provide a motor and motor frame which obviates the limitations of the prior art.
Prior Art:
GB2276987 relates to a waterproof casing for pump/motor combination.
It discloses the concept of interior of the motor housing communicated with the
atmosphere via breathing holes in the motor housing end wall.
JP61266047 relates to a rotary electric machine having outer fan.
It discloses improved cooling property of a rotary electric machine by forming a
cut-out at the housing side of a fan cover.
However, as per existing electrical and safety standards, direct communication via cut-outs is an undesirable characteristic.
Objects of the Invention:
An object of the invention is to provide improved or relatively increased heat dissipation with respect to a motor.
Another object of the invention is to provide a relatively safer and reliable flame proofmotor.

Yet another object of the invention is to provide higher ratings for motor due to increased heat dissipation capacity.
Still another object of the invention is to avoid stresses in a motor housing due to inadvertent thermal changes.
Summary of the Invention:
According to this invention, there is provided a motor frame with increased heat dissipation, said frame adapted to be wrapped around a motor, said frame comprises:
a. an introduced chamber to provide a dedicated air circulation circuit inside said
motor frame;
b. plurality of dedicated cut outs in said frame; and
c. plurality of blocker elements located intermittently in between frame ribs,
external to the motor frame, adapted to be blocked with a blocker element in
order to isolate inner circuit of air and outer circuit of air.
According to this invention, there is provided a motor with increased heat dissipation, said motor comprises: i. motor frame adapted to wrap around a motor, characterised in that, said motor frame includes an introduced chamber to provide a dedicated air circulation circuit inside said motor frame; ii. plurality of dedicated cut outs in said frame; and
iii. plurality of blocker elements located intermittently in between frame ribs, external to the motor frame, adapted to be blocked with a blocker element in order to isolate inner circuit of air and outer circuit of air.

Typically, said blocker elements are, typically, mild steel blocker elements.
Typically, said blocker elements are axially elongated blocker elements placed externally on said motor frame.
Typically, said blocker elements are radially dispersed axially parallel blocker elements.
Brief Description of the Accompanying Drawings:
The invention will now be described in relation to the accompanying drawings, in which:
Figure 1 illustrates a front isometric view of a motor frame with increased heat dissipation.
Figure 2 illustrates an isometric cut-out sectional view of the motor frame of Figure 1;
Figure 3 illustrates a back isometric view of the motor frame of Figure 1; Figure 4 illustrates a front view of the motor frame of Figure 1;
Figure 5 illustrates a top view of the motor frame of Figure 1; Figure 6 illustrates a bottom view of the motor frame of Figure 1; Figure 7 illustrates a back view of the motor frame of Figure 1; and Figure 8 illustrates a side view of the motor frame of Figure 1.

Detailed Description of the Accompanying Drawings;
According to this invention, there is provided a motor and motor frame with increased heat dissipation.
Figure 1 illustrates a front isometric view of a motor frame (100) with increased heat dissipation. Figure 2 illustrates an isometric cut-out sectional view of the motor frame (100) of Figure 1. Figure 3 illustrates a back isometric view of the motor frame (100) of Figure 1. Figure 4 illustrates a front view of the motor frame (100) of Figure 1. Figure 5 illustrates a top view of the motor frame (100) of Figure 1. Figure 6 illustrates a bottom view of the motor frame (100) of Figure 1, Figure 7 illustrates a back view of the motor frame (100) of Figure 1. Figure 8 illustrates a side view of the motor frame (100) of Figure 1.
In accordance with an embodiment of this invention, there is provided a conventional motor frame (12) which wraps around a motor (not shown). The motor includes rotating parts which lead in the production of heat and hot air, which needs to be dissipated i.e. led out of the surrounding zone of the motor parts in order to ensure longer and a smoother life for the motor.
In accordance with another embodiment of this invention, there is provided a chamber introduced in the frame (12). Here, a dedicated air circuit is introduced in the path of air in order to 'establish air circulation inside the motor. When the internal fan will rotate, the rotation of the fan will drive the hot air in a pre-defined direction so as to create a laminar path for air circulation. Due to this, heat from the motor windings will be in touch with the frame, thereby causing rapid heat

exchanging capability, and thus drastic improvement in heat dissipation will happen,
In accordance with another embodiment of this invention, there is provided a plurality of dedicated cut outs (14) in the frame (12). Once the frame is cut, intermittently, there will be direct contact of internal to external air which is not acceptable as per standard.
In accordance with yet another embodiment of this invention, there is provided a plurality of frame ribs which are adapted to be blocked with a blocker element (16) in order to isolate inner circuit and outer circuit. These blocker elements (16) are, typically, MS plate elements.
Due to this, mechanism and assembly, communication between the external and internal air circuit is improved without any potential hazard to the working of the motor. Relatively more heat can be dissipated from the motor, thereby increasing the efficiency of the motor. Temperature rise of the motor will be reduced.
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 motor frame with increased heat dissipation, said frame adapted to be
wrapped around a motor, said frame comprising:
a. an introduced chamber to provide a dedicated air circulation circuit inside
said motor frame;
b. plurality of dedicated cut outs in said frame; and
c. plurality of blocker elements located intermittently in between frame ribs,
external to the motor frame, adapted to be blocked with a blocker element in
order to isolate inner circuit of air and outer circuit of air.
2. A motor frame as claimed in claim 1 wherein, said blocker elements are, typically, mild steel blocker elements.
3. A motor frame as claimed in.claim 1 wherein, said blocker elements are axially elongated blocker elements placed externally on said motor frame.
4. A motor frame as claimed in claim 1 wherein, said blocker elements are radially dispersed axially parallel blocker elements.
5. A motor with increased heat dissipation, said motor comprising:
i. motor frame adapted to wrap around a motor, characterised in that, said motor frame includes an introduced chamber to provide a dedicated air circulation circuit inside said motor frame;
ii. plurality of dedicated cut outs in said frame; and

iii. plurality of blocker elements located intermittently in between frame ribs, external to the motor frame, adapted to be blocked with a blocker element in order to isolate inner circuit of air and outer circuit if air.
6. A motor as claimed in claim 1 wherein, said blocker elements are, typically, mild steel blocker elements.
7. A motor as claimed in claim 1 wherein, said blocker elements are axially elongated blocker elements placed externally on said motor frame.
8. A motor as claimed in claim 1 wherein, said blocker elements are radially dispersed axially, parallel blocker elements.