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
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
Tambe Chandrashekhar Shankar of Crompton Greaves Ltd, LT-Motors Division, A6/2, MIDC, Industrial Area, Ahmednagar - 414111, Maharashtra India, 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 mechanical engineering.
Particularly, this invention relates to motors with stator cores and wound packs.
Still particularly, this invention relates to a method and equipment for removing a wound body, vertically, from a stator body of an electrical equipment, specifically, of a motor.
Background of the Invention:
An induction motor body comprises two parts; (1) a stator which is stationary and a wound pack within a stator body to produce rotating magnetic flux and (2) a rotor which is a rotating member. The wound pack in stator is a stack of laminations, typically of silicon steel wound with copper wire coils. The wound pack is pressed in the stator body, typically of cast iron.
The pressing is done on a vertical pneumatic press. Its radial movement is restricted by putting a dowel pin inside the stator body and wound pack. Often, there are cases there is a need to unpress the stator pack from the stator body. The reasons for this unpressing can be because of some defect found in the casting quality of the stator case after pressing the wound pack.
One of the methods of unpressing the wound pack out of the stator on the same vertical press results into lead wire / copper wire damage as the wound pack hits

the ground while unpressing which makes the wound pack unusable after press out. A typically cost of a wound pack would be Rs. 10,000.
There is a need for a method and a tool for separating the wound pack from the body of motor, in a vertical manner, without damage, for re-using the operative item.
Prior Art:
US6973707 discloses an equipment and method wherein a stator is adhered to cryogenic refrigeration until the stator shrinks and pulls away from the interior surface housing.
One major defect of the methods of the prior art is that when the wound pack is pressed out from stator body, the wound pack may be dropped on ground 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.
Yet an additional object of the invention is to prevent the wound pack from hitting the ground once the impressing occurs.
Still an additional object of the invention is to prevent damage to the copper wires of the wound pack during unpressing, thereby reducing wastage.
Summary of the Invention:
According to this invention, there is provided a method and equipment for removing a wound body, vertically, from a stator body of an electrical equipment, specifically, of a motor.
According to an embodiment of this invention, there is provided a vertical press-out equipment for removing a wound body from a vertically positioned stator body, said equipment comprises:

a. first fixture which is fitted co-axially and concentrically into said wound
pack concentrically lodged inside said stator body;
b. annular hollow raised platform of a pre-defined thickness adapted to co-
axially receive a stator body with a wound pack concentrically lodged in it;
c. telescopic shaft, co-axial with said annular hollow raised platform adapted to
telescope out of said platform and further adapted to be passed through said
wound pack in a co-axial manner, upon being telescoped out;
d. mandrel adapted to be placed atop said shaft in order to press said wound
pack out of said stator body;
e. lock plate adapted to lock said mandrel in its operative position atop said
shaft;
characterised in that,
said shaft includes an annular spacer element about it, with a pre-defined thickness in order to restrict the fall of the falling wound pack and prevent its damage.
Typically, said first fixture contains lugs adapted to provide hoist receiving means for hoisting said stator body and wound pack fitted with said first fixture by a crane mechanism in order to lift said stator body along with said wound pack.
Typically, said telescopic shaft is a pneumatically operated telescopic shaft.
According to another embodiment of this invention, there is provided a vertical press-out method for removing a wound body from a vertically positioned stator body, said method comprises the steps of:

a. fitting a first fixture which co-axially and concentrically into said wound
pack concentrically lodged inside said stator body;
b. co-axially receiving a stator body with a wound pack concentrically lodged
in it upon an annular hollow raised platform of a pre-defined thickness;
c. telescopically raising a telescopic shaft, co-axial with said annular hollow
raised platform out of said platform and further passing through said wound
pack in a co-axial manner;
d. pressing a mandrel adapted to be placed atop said shaft in order to press said
wound pack out of said stator body in an operative downward manner;
e. locking said mandrel in its operative position atop said shaft by means of a
lock plate;
characterised in that,
providing an annular spacer element about said shaft, with a pre-defined thickness in order to restrict the fall of the falling wound pack and prevent its damage.
Brief Description of the Accompanying Drawings:
Figure 1 illustrates a schematic front view of the method and equipment of the prior art.
The invention will now be described in relation to the accompanying drawings, in
which,
Figure 2 illustrates an isometric view of the vertical press-out equipment; and
Figure 3 illustrates a schematic front view of the vertical press-out equipment and its method of operation, thereby.

Detailed Description of the Accompanying Drawings:
Figure 1 illustrates a schematic front view of the method and equipment of the prior art.
A stator body is lifted with the help of first fixture (3) and stator is rested on the second fixture (4). This second fixture (4) holds the stator body in a co-axial, vertical manner. The shaft (9) is co-axial with the second fixture (4), the first fixture (3) and the stator. Reference numeral (2) refers to the stator case which holds the stator. The shaft is pneumatically operated i.e. by means of air pressure. The shaft is adapted to telescope out or telescope in, depending upon the need. Once the stator is placed, the shaft (9) is raised such that the shaft telescopes into the wound pack (1) of the stator case (2). The stator holds the wound pack (1) concentrically fitted within it. Now, the wound pack is co-axial with the shaft (9) and the remaining assemblies. The shaft (9) at its operative top end is adapted to receive a mandrel (6). Since there is no support for the first fixture (3), it rests against the shoulder of the shaft (9). This results in a difficult condition of removing crane hooks after the first fixture (3) falls on the shaft (9). After putting a lock plate (8) on the mandrel (6), the shaft is lowered by air pressure. The wound pack (1) disengages from the stator body (2) and falls onto the ground by action of gravity. This damages the copper wires and lead wires, thus rendering the removed wound pack useless in many conditions.
According to this invention, there is provided a method and equipment for removing a wound body, vertically, from a stator body of an electrical equipment, specifically, of a motor.

Figure 2 illustrates an isometric view of the vertical press-out equipment; and
Figure 3 illustrates a schematic front view of the vertical press-out equipment and its method of operation, thereby.
In accordance with an embodiment of this invention, said vertical press-out equipment includes an annular hollow raised platform (4) or second fixture of a pre-defined thickness adapted to co-axially receive a stator case (2) with a stator body. The stator body includes a wound pack (1) concentrically fitted which needs to be removed without damaging the copper windings or the lead wires.
In accordance with another embodiment of this invention, said vertical press-out equipment includes a telescopic shaft (9), co-axial with said annular hollow raised platform (4). This telescopic shaft (9) is adapted to telescope out of said platform (4) by pressure of air, i.e. it is pneumatically operated. The telescopic shaft (9) passes through the wound pack (1) in a co-axial manner.
In accordance with yet another embodiment of this invention, said vertical press-out equipment includes a first fixture (3) which is fitted co-axially and concentrically into the wound pack (1) inside the stator body (2). This first fixture (3) contains lugs which help the hoisting by a crane mechanism in order to lift the stator body (2) along with the wound pack (1). This assembly is then placed over the annular hollow raised platform (4) or second fixture in a co-axial manner. . The telescopic shaft (9) passes through the wound pack (1) and the first fixture (3) in a co-axial manner.

In accordance with still another embodiment of this invention, said vertical press-out equipment includes a mandrel (6) adapted to be placed atop said shaft in order to press said wound pack (1) out of stator body (2).
In accordance with an additional embodiment of this invention, there is provided a lock plate (8) adapted to lock said mandrel (6) in its operative position atop said shaft (9).
In accordance with yet an additional embodiment of this invention, said shaft (9) includes an annular spacer element (7) about it. The thickness of the spacer element is defined (1) in order to restrict the fall of the falling wound pack and prevent its damage.
Initially, stator wound pack (1) along with stator case (2) is lifted by crane with the help of fixture (3). Some spacers are put on the shaft (9) such that when the shaft (9) is completely lowered (telescoped in), there is a gap of about 40 mm between spacer (7) and second fixture (4). The shaft (9) is raised so that the stator can be positioned on second fixture (4). In this method, due to use of spacer, first fixture (3) does not fall on the ground, thus facilitating removal of crane hooks. The mandrel (6) for pressing the stator is positioned and locked with the help of lock plate (8). In this method, as the shaft lowers down, wound pack (1) remained held in the first fixture (3) and spacer (7). Thus, hitting of the wound pack (1) on the ground and causing of damage to the winding and lead wires is prevented.
The invented method prevents the job or the wound pack from hitting the ground and is held with the fixture which avoids damage to the copper wires, thus reducing wastage.

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 vertical press-out equipment for removing a wound body from a vertically positioned stator body, said equipment comprising:
a. first fixture which is fitted co-axially and concentrically into said wound
pack concentrically lodged inside said stator body;
b. annular hollow raised platform of a pre-defined thickness adapted to co-
axially receive a stator body with a wound pack concentrically lodged in it;
c. telescopic shaft, co-axial with said annular hollow raised platform adapted to
telescope out of said platform and further adapted to be passed through said
wound pack in a co-axial manner, upon being telescoped out;
d. mandrel adapted to be placed atop said shaft in order to press said wound
pack out of said stator body;,
e. lock plate adapted to lock said mandrel in its operative position atop said
shaft;
characterised in that,
said shaft includes an annular spacer element about it, with a pre-defined thickness in order to restrict the fall of the falling wound pack and prevent its damage.
2. An equipment as claimed in claim 1 wherein, said first fixture contains lugs adapted to provide hoist receiving means for hoisting said stator body and wound pack fitted with said first fixture by a crane mechanism in order to lift said stator body along with said wound pack.

3. An equipment as claimed in claim 1 wherein, said telescopic shaft is a pneumatically operated telescopic shaft.
4. A vertical press-out method for removing a wound body from a vertically positioned stator body, said method comprising the steps of:
a. fitting a first fixture which co-axially and concentrically into said wound
pack concentrically lodged inside said stator body;
b. co-axially receiving a stator body with a wound pack concentrically lodged
in it upon an annular hollow raised platform of a pre-defined thickness;
c. telescopically raising a telescopic shaft, co-axial with said annular hollow
raised platform out of said platform and further passing through said wound
pack in a co-axial manner;
d. pressing a mandrel adapted to be placed atop said shaft in order to press said
wound pack out of said stator body in an operative downward manner;
e. locking said mandrel in its operative position atop said shaft by means of a
lock plate;
characterised in that,
providing an annular spacer element about said shaft, with a pre-defined thickness in order to restrict the fall of the falling wound pack and prevent its damage.