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 method and equipment for removing a wound body from a stator body of an electrical equipment.
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR
Biman Ashok Chandraiyya, Gadgc Sachin Changdeo, Yelkar Kashinath Sakharam and Ahuja Mukesh of LT Motors Division (M3), A-6/2 MIDC Ahmadnagar 4340001, Maharashtra, India; all 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:

TECHNICAL FIELD OF THE INVENTION:
This invention relates to the field of mechanical engineering.
Particularly, this invention relates lo motors with stator cores and wound packs.
Still particularly, this invention relates to a method and equipment for removing a wound body from a stator body of an electrical equipment, specifically, of a motor.
BACKGROUND OF THE INVENTION:
A motor body comprises a stator body and a wound pack within said stator body. The wound pack and motor body are typically assembly-fitted on a platform with a locking pin and a ram. The machine used for assembling is a hydraulic machine through plate assembly.
The motor is. then, locked with a pin to obtain a fit with an optimized tightening process.
Dowel pins are used for fixing, in this assembly. The conventional drilling machine is used to remove the Dowel pins by a drilling method.
This conventional method has disadvantages, as explained below.

During the drilling process of dowel pins, it may lead to visual and functional defects, which may include, amongst other things Foot or fin - break, bolt - shear off, air cracks in motor.
However, in such motor with wound pack, it has been observed that, either:
1) The body of motor is re-usable, but wound pack may have damaged; or
2) Wound pack may be re-usable, but body of motor may have damaged.
In either case, there is a need for a method and a tool for separating the wound pack from the body of motor, without further damage, for re-using the operative item.
PRIOR ART:
According to one conventional art, tools are used for a drilling method which, in turn, is used for drilling out the dowel pin from stator body & wound pack. In the method of the conventional art. an appropriate size drill was selected as per dowel pin size. Then, a hole is drilled in the dowel pin. Further, the drilled hole is threaded. Still further, by using a long threaded nut, the dowel pin is pulled out. The use of this method is riddled with some flaws. Firstly, an extremely skilled worker is required to perform this method. Secondly, the chances of drill-breakage is relatively higher. Thirdly, this method leaves chances for- wound pack may be caused to burr, which ultimately results in wound pack failure. Fourthly, if appropriate care is not taken during drilling. and if the drilling depth increases (than required), then the entire wound pack may be rejected for use. Fifthly, time required for this operation is relatively more and is not fool-proof in order to obtain a workable wound pack.

According to another conventional art, tools are used for a vertical pressout method for removal of wound pack. In vertical pressout method, firstly a holding cup is placed at the bottom of the spigot plate. The purpose of this holding cup is to support stator body and for holding the wound pack body after pressout is completed. Secondly, appropriately sized spigot plate is selected and put on the holding cup. Thirdly, a mandrel is put in the stator body which is to be pressed out and this whole assembly (i.e. stator body & mandrel) is picked up and placed on the spigot plate, Fourthly, the ram should be taken out to its highest limit. Fifthly, in order to fill the ram gap, different bushes are inserted in ram. Sixthly, lock nut is put on the top of the ram. Seventhly. then press out is performed as per the job required. The method described, is inherent with flaws which are detailed herein.
One major defect of this method is that when the wound pack is pressed out from stator body, the wound pack may be dropped on bottom spigot plate due which winding overhang may get distorted or damaged. Also, a skilled operator required to perform this task of separation. The nature of the machine and fixture is heavy, for using this method Time required is more. There may be chances of accident, while press out due to lock nut.
OBJECTS OF THE INVENTION:
An object of the invention is to re-use either the wound pack of a motor, or the stator body of the motor, without further damage.

Another object of the invention is to reduce wastage of electro-mechanical equipment.
Yet another object of the invention is to quickly separate the components of an electrical equipment, in a manner such that they may be appropriately re-used.
Still another object of the invention is to use the existing tools and equipment for separation of components of electrical equipment.
An additional object of the invention is to prevent cracks or drilling assemblies from damaging components of electrical equipment, during the method and process of separation.
SUMMARY OF THE INVENTION:
According to this invention, there is provided an equipment for removing a wound pack from a slator body of an electrical equipment, using a pressing machine, said equipment comprises:
a. aligning means adapted to align a pressing machine in an operative horizontal
configuration for receiving said statorbody of said electrical equipment ;
b. disengaging means adapted to disengage lead wires and associated circuitry between
said wound pack and said stator body:
c. first positioning means adapted to position said stator body along with said wound
pack on said operative horizontal configuration of said pressing machine;
d. first locating means adapted to locate said disengages lead wires in a pressing cup of
said pressing machine;
e. second locating means adapted to locate said slator body along with said wound pack
on a mandrel of said pressing machine;

f. second positioning means adapted to position said mandrel and said ram of said
pressing machine in an operative co-axial configuration with respect to each other
such that said stator body, said wound pack, said mandrel and said ram form a
concentric fitted co-axial assembly during the process of un-pressing for removing
said wound pack from said stator body;
g. gap defining means adapted to define a gap between said stator body and a spigot
plate of said pressing machine, for effective removal of dowel pins from said wound
pack without damaging said wound pack;
h. gripping means, located at distal end of said co-axial and concentric assembly. adapted to grip said co-axial and concentric assembly for effective removal of said wound pack from said stator body:
i. shear exerting means adapted to exert shear force for shearing said dowel pins in order to unlock said wound pack off said stator body, by elimination of gap defined by said gap defining means;
j. removing means adapted to remove said stator body off said co-axial and concentric assembly gripped by said gripping means; and
k. separation means adapted to separate wound pack off said mandrel and ram of said pressing machine.
Typically, said gripping means (40A; 40B) is a locking cup (40A) with locking pin (4013).
Typically, wherein said ram is a hydraulic ram,
According to this invention there is further provided a method for removing a wound body from a stator body of an electrical equipment, said method comprises the steps of:

a. aligning a pressing machine in an operative horizontal configuration for receiving said
stator body of said electrical equipment;
b. disengaging lead wires and associated circuitry between said wound pack and said stator
body;
c. positioning said stator body along with said wound pack on said operative horizontal
configuration of said pressing machine;
d. locating said disengages lead wires in a pressing cup of said pressing machine:
e. locating said stator body along with said wound pack on a mandrel of said pressing
machine;
f. positioning said mandrel and said ram of said pressing machine in an operative co-axial
configuration with respect to each other such that said stator body, said wound pack, said
mandrel and said ram form a concentric fitted co-axial assembly during the process of un-
pressing for removing said wound pack from said stator body;
g. defining a gap between said stator body and a spigot plate of said pressing machine, for
effective removal of dowel pins from said wound pack without damaging said wound
pack;
h. gripping said co-axial and concentric assembly for effective removal of said wound pack from said stator body;
i. exerting shear force for shearing said dowel pins in order to unlock said wound pack off said stator body, by elimination of gap defined by said gap defining means;
j. removing said stator body off said co-axial and concentric assembly gripped by said gripping means; and
k. separating wound pack off said mandrel and ram of said pressing machine.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
The invention will now be described in relation to the accompanying drawings, in which.
Figure 1 illustrates a schematic of the equipment for removing a wound body from a stator body of an electrical equipment.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
According to this invention, there is provided a method and equipment for removing a wound body from a stator body of an electrical equipment, specifically, of a motor.
Figure 1 illustrates a schematic of the equipment for removing a wound pack (5) from a stator body (10) of an electrical equipment, using a pressing machine, said equipment comprises:
a. aligning means adapted to align a pressing machine in an operative horizontal
configuration for receiving said stator body (10) of said electrical equipment ;
b. disengaging means adapted to disengage lead wires and associated circuitry between said
wound pack (5) and said stator body (10);
c. first positioning means adapted to position said stator body (10) along with said wound
pack (5) on said operative horizontal configuration of said pressing machine:
d. first locating means adapted to locate said disengages lead wires in a pressing cup (60) of
said pressing machine;
e. second locating means adapted to locate said stator body (10) along with said wound
pack (5) on a mandrel (20) of said pressing machine;

f. second positioning means adapted to position said mandrel (20) and said ram (30) of said
pressing machine in an operative co-axial configuration with respect lo each other such
that said staior body (3 0), said wound pack (5), said mandrel (20) and said ram (30) form
a concentric fitted co-axial assembly during the process of un-pressing for removing said
wound pack (5) from said stator body (10);
g. gap defining means adapted to define a gap between said stator body (10) and a spigot
plate (50) of said pressing machine, for effective removal of dowel pins from said wound
pack (5) without damaging said wound pack (5);
h. gripping means (40A, 40B). located at distal end of said co-axial and concentric
assembly, adapted to grip said co-axial and concentric assembly for effective removal of
said wound pack (5) from said stator body (10); i. shear exerting means adapted to exert shear force for shearing said dowel pins in order to
unlock said wound pack (5) off said stator body (10). by elimination of gap defined by
said gap defining means; j, removing means adapted to remove said stator body (10) off said co-axial and concentric
assembly gripped by said gripping means (40A, 40B); and k. separation means adapted to separate wound pack (5) off said mandrel (20) and ram (30)
of said pressing machine.
The steps performed by the equipment are elaborated in.detail, hereafter. Initially, it is identified if defect lies in stator body (10) or in wound pack (5).

In accordance with an embodiment of this invention, there is provided a first step of modifying a vertical pressing machine to be used to function in its horizontal configuration. Typically, the functionality of a pressing machine, arc used for the method and process of un-pressing. according to this invention. This machine comprises an operative horizontal mounting axis for receiving a stator body (10) of a motor. According to an exemplary embodiment, the spigot (50) of said stator body (10) may be damaged, in this instance. Hence, the wound body (5) may be intact, and needs to be removed for re-use in another equipment.
In accordance with another embodiment of this invention, there is provided a second step of removing lead wires and associated circuitry, to disengage any connection between said wound pack (5) and stator (10) body. This dissociation ensures a smooth removal of the wound pack (5) out of the stator body (10).
In accordance with yet another embodiment of this invention, there is provided a third step of positioning said stator body (10) along with said wound pack (5) on said horizontal configuration of said pressing machine and further locating said separated lead wires in a pressing cup (60) of the pressing machine. As per the frame size of stator body (10) and wound pack (5), the machine setting is done. i.e. selecting a pressing cup (60) size, a mandrel (20) size, a spigot plate (50) size. and the like.
In accordance with still another embodiment of this invention, there is provided a fourth step of locating said stator body (10) along with said wound pack (5) on a mandrel (20) of said pressing machine and further positioning the ram (30) of said pressing machine, said mandrel (20) and

said ram (30) being in a co-axial configuration with respect to each other. AM together, the stator body (10), the wound body (5). the mandrel (20). and the ram (30). arc all co-axial with respect to each other, and form a concentric fitted assembly during the process of un-prcssing for removal. This also provides adequate grip with respect to each other. In this step, the !ead wire and the wound pack (5) overhang should enter in stepped pressing cup (60).
In accordance with an additional embodiment of this invention, there is provided a fifth step of providing a gap between said stator body (10) and said spigot plate (50). The function of this gap, is in the effective removal of dowel pins, off the wound pack (5) without damaging.
Typically, the gap between spigot plate (50) and stator body (]0) has to be more than 8mm as the typical diameter of a dowel pin is 8mm. This gap is specifically provided for the purpose of shearing off dowel pin. and hence has to be more than 8mm.
Particularly, the gap is in the range of 8mm to 22mm. Stil! particularly,, the gap is in the range of 8mm to 18mm.
Further, the machine is operated to take the ram (30) in an operative forward direction. In accordance with yet an additional embodiment of this invention, there is provided a sixth step of providing a locking cup (40A) along with a locking pin (40B) at the distal end of said co-axial and concentric stator body (10); wound pack (5). mandrel (20) and ram (30). This locking cup (40A), is typically a gripping assembly adapted to provide a proper closure of the co-axia! and

concentric stator (10) so that the pressing machine may effectively work without any loss of grip, and ensures stable and smooth removal of wound pack (5).
Then the machine is operated to take the ram (30) in an operative reverse direction.
In accordance with still an additional embodiment of this invention, there is provided a seventh step of dowel pin shearing process to unlock the wound body (5) off the stator body (10). Typically, in this step, the gap between the stator body (10) and the spigot plate (50) is eliminated. This elimination of gap, shears off the dowl pins, with no operative damage.
Yet further, the locking cup (40A) and locking pin (40B) fit another pressing cup (60) on wound pack (5). The machine is then operated to take the ram (30) in an operative forward direction so as to lit the locking pin (40B) only.
In accordance with another additional embodiment of this invention, there is provided an eighth step of removal of stator body (10). off the co-axial and concentric fit. by means of the locking cup (40A) and the Socking pin (40B) which were fitted onto it. The fit was adapted in such a manner, that after the dowel pin shearing step, the stator body (10) can be freely slided off the wound pack .(5). The sheared off dowel pins fall within the body of the stator body (10). which can later be thrown out. Still further, the spigot plate (50) is moved in an operative forward direction.

In accordance with yet another additional embodiment of this invention, there is provided a ninth step of separation, wherein the wound pack (5) is resident on the mandrel (20) and ram (30), and can be slid off for re-use. The stator body (10), is removed off. and is separate with respect to previous co-axial and concentric fit.
Lastly, the sheared out dowel pins are removed from stator body (10), and the stator body (10) and / or wound pack (5) is ready for re-usc.
By using the equipment and method of this invention, it is observed that damage to wound pack is highly restricted. Also, damage to stator body is highly restricted. This equipment and method quickens the task of un-pressing. Economic savings, due to reduction in scrap, are brought about. 100% re-use of non-damaged wound pack / stator body is possible. No special tooling is required, for separating the aound pack from stator body; either of which can be re-used. The use of this equipment provides an anti-crack (shear of doweJ pin) method of un-pressing the wound pack. Further, there is no need to drill out dowel pin pressed on stator body

We claim,
l.An equipment for removing a wound pack from a stator body of an electrical equipment, usinga pressing machine, said equipment comprising:
a. aligning means adapted to align a pressing machine in an operative horizontal
configuration for receiving said stator body of said electrical equipment ;
b. disengaging means adapted to disengage lead wires and associated circuitry between said
wound pack and said stator body;
c. first positioning means adapted to position said slator body along with said wound pack
on said operative horizontal configuration of said pressing machine;
d. first locating means adapted to locate said disengages lead wires in a pressing cup of said
pressing machine;
e. second Jocating means adapted to locate said stator body along with said wound pack on
a mandrel of said pressing machine;
f. second positioning means adapted to position said mandrel and said ram of said pressing
machine in an operative co-axial configuration with respect to each other such that said
stator body, said wound pack, said mandrel and said ram form a concentric fitted co-axia!
assembly during the process of un-prcssing for removing said wound pack from said
stator body;
g. gap defining means adapted to define a gap between said slator body and a spigot plate of
said pressing machine, for effective removal of dowel pins from said wound pack without
damaging said wound pack:
h. gripping means, located at distal end of said co-axial and concentric assembly, adapted lo grip said co-axial and concentric assembly for effective removal of said wound pack from said stator body;

i, shear exerting means adapted to exert shear force for shearing said dowel pins in order to unlock said wound pack off said stator body, by elimination of gap defined by said gap defining means;
j. removing means adapted to remove said stator body off said co-axiai and concentric assembly gripped by said gripping means; and
k. separation means adapted to separate wound pack off said mandrel and ram of said pressing machine.
2. An equipment as claimed in claim 1 wherein, said gripping means (40A, 40B) is a locking cup (40A) with locking pin (40B).
3. An equipment as claimed in claim ), wherein said ram is a hydraulic ram.
4. A method for removing a wound body from a stator body of an electrical equipment, said method comprising the steps of:
a. aligning a pressing machine in an operative horizontal configuration for receiving said
stator body of said electrical equipment ;
b. disengaging lead wires and associated circuitry between said wound pack and said stator
body;
c. positioning said stator body along with said wound pack on said operative horizontal
configuration of said pressing machine;
d. locating said disengages lead wires in a pressing cup of said pressing machine;
e. locating said stator body along with said wound pack on a mandrel of said pressing
machine;

f. positioning said mandrel and said ram of said pressing machine in an operative co-axial
configuration with respect to each other such that said stator body, said wound pack, said
mandrel and said ram form a concentric fitted co-axial assembly during the process of un-
prcssing for removing said wound pack from said stator body;
g. defining a gap between said stator body and a spigot plate of said pressing machine, for
effective removal of dowel pins from said wound pack without damaging said wound
pack;
h. gripping said co-axial and concentric assembly for effective removal of said wound pack from said stator body;
i. exerting shear force for shearing said dowel pins in order to unlock said wound pack off said stator body, by elimination of gap defined by said gap defining means;
j. removing said stator body off said co-axial and concentric assembly gripped by said gripping means: and
k. separating wound pack off said mandrel and ram of said pressing machine.