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 system and method of press-out and press-in of wound pack from or in a
stator body in continuous sequence.
APPLICANT(S):
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India; an Indian Company.
INVENTOR (S):
Shinde Shridhar Bhivaji, Thokal Vithhal Jagannath and Kothekar Anand Ashok; all of Crompton Greaves Limited, LT Motors (M3) Division, A6/2, MIDC Industrial Area, Ahmednagar 414 111, 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:

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 system and method of press-out and press-in of wound pack from or in a stator body in continuous sequence.
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.

According to the prior art, the entire process involved manual labour of 1 to 2 days per stator case combination.
OBJECTS OF THE INVENTION:
An object of the invention is to re-use the wound pack of a stator without damage to windings.
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 prevent cracks or drilling assemblies from damaging components of electrical equipment, during the method and process of separation of wound pack from stator.
An additional object of the invention is to provide a tandem process for removal and insertion of wound pack from a damaged stator casing to a new stator casing.
Yet an additional object of the invention is to provide a tandem change-over process of wound pack from a damaged stator case to a new stator case, without any additional tools.
Still an additional object of the invention is to provide a tandem process for removal and insertion of wound pack from a damaged stator casing to a new stator

casing with reduced man power.
Another additional object of the invention is to reduce cycle time and increase production in relation to a process for removal and insertion of wound pack from a damaged stator casing to a new stator casing.
SUMMARY OF THE INVENTION:
According to this invention, there is provided a method of press-out of a wound pack from a first stator case and of press-in into a second stator case, in a continuous sequence, said method comprises the steps of:
a. first step of installing said first stator case on a hydraulic press base plate,
said base plate involving a hydraulically operating cam shaft adapted to be
co-axial with said installed first stator case;
b. second step of installing said second stator case, having a wound pack that is
to be pressed out, on said first stator case;
c. third step of raising said cam shaft, from said base plate to a desired height
such that it is enveloped, coaxially, by said first stator case and said second
stator case;
d. fourth step of using a cup to press said wound pack from said second stator
case to said first stator case in an operative downward direction;
e. fifth step of inserting said cup into said cam shaft;
f. sixth step of locating at least a spacer element on said cam shaft, said spacer
element being locked on to said cam shaft locking plate;
g. seventh step of bringing out lead wires from the operative bottom of said first
stator case and holding said lead wires, while the cam shaft arm is being
lowered; and

h. eighth step of lowering said cam shaft,
thereby, resulting in press-out of said wound pack from said second stator case and
in press-in of said wound pack into said first stator case, in a continuous manner.
Typically, said step of hydraulically operating said cam shaft comprises the step of operating said cam shaft by means of air pressure.
Typically, said step of installing said first stator case on a hydraulic press base plate comprises the step of installing a good stator case on said hydraulic press base plate.
Typically, said step of installing said second stator case, having a wound pack, comprises the step of installing a bad or faulty or damaged stator case, having a wound pack.
Typically, said step of installing said second stator case, having a wound pack, on said first stator case, comprises the step of co-axially installing said second stator case, having a wound pack, on said first stator case.
Typically, said cam shaft is a spindle arm.
Typically, said step of hydraulically operating said cam shaft comprises the step of operating said cam shaft by pneumatic pressure.
Typically, said step of using a cup comprises the step of obtaining said cup from a fixture which is used for pressing the wound pack into a stator case.

Typically, said step of inserting said cup comprises the step of arranging said cup so that it rests on said second stator stamping portion of said wound pack.
According to this invention, there is also provided a system for press-out of a
wound pack from a first stator case and of press-in into a second stator case, in a
continuous sequence, said system comprises:
i. hydraulic press base plate adapted to install said first stator case to receive a wound pack that is to be pressed in, said base plate further comprising a hydraulically operating cam shaft adapted to be co-axial with said installed first stator case, said cam shaft adapted to be hydraulically raised and lowered;
ii. second stator case, having a wound pack, on said first stator case;
iii. cup adapted to press said wound pack from said second stator case to said first stator case in an operative downward direction; and
iv. at least a spacer element on said cam shaft, said spacer element being locked on to said cam shaft locking plate
Typically, said hydraulically operating cam shaft is an air pressure operated cam shaft.
Typically, said hydraulically operating cam shaft is a pneumatic pressure operated cam shaft.
Typically, said second stator case is a bad or faulty or damaged stator case.
Typically, said first stator case is a good stator case adapted to receive a wound pack.

Typically, said second stator case is a bad or faulty or damaged stator case adapted remove a wound pack.
Typically, said cam shaft is a spindle arm.
Typically, said cup is a fixture cup obtained from a fixture which is used for pressing the wound pack into a stator case.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
The invention will now be described in relation to the accompanying drawings, in which:
Figures 1 to 5 illustrate various steps for performing the method of this invention.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
According to this invention, there is provided a system and method of press-out and press-in of wound pack from or in a stator body in continuous sequence.
Figures 1 to 5 illustrate various steps for performing the method of this invention.
In accordance with an embodiment of this invention, there is a first step of installing a first stator case (12) which is in good condition on a hydraulic press base plate (14). The stator case is the body in which a wound pack is to be pressed in from another stator case.

The hydraulic press base plate includes a cam shaft which resides co-axial to the first stator once the first stator s located on the base plate. This cam shaft is operated by means of air pressure.
In accordance with another embodiment of this invention, there is a second step of install a second stator (16) having a wound pack (18) on the first stator case (12) fitted on the hydraulic press base plate (14). The second stator includes a faulty stator case from which wound pack is to be removed and fitted into the first stator case. The installation is a co-axial installation.
In accordance with yet another embodiment of this invention, there is a third step of raising the cam shaft or spindle arm (22), from the base plate (14) to a desired height such that it is enveloped, coaxially, by the first stator (12) and the second stator (14). The cam shaft or spindle arm (22) is raised by pneumatic pressure.
In accordance with still another embodiment of this invention, there is a fourth step of using a cup (24) to press the wound pack (18). The cup is taken from a fixture which is used for pressing the wound pack into a stator case. The cup (24) is arranged so that it rests on the second stator (16) stamping portion of the wound pack.
In accordance with an additional embodiment of this invention, there is a fifth step of inserting the cup (24) into the cam shaft or spindle arm (22).
In accordance with yet an additional embodiment of this invention, there is a sixth step of locating at least a spacer element (28) on the cam shaft or spindle arm (22).

The spacer element (28) is then locked on to the cam shaft or spindle arm (22) with a locking plate (26).
In accordance with still an additional embodiment of this invention, there is a seventh step of bringing out lead wires from the bottom of the first stator case (12) and holding the lead wires, while the cam shaft or spindle arm (22) is being lowered.
In accordance with another additional embodiment of this invention, there is an eights step of lowering the cam shaft or spindle arm (22).
Thus, wound pack (18) is inserted in the second (new) stator case (14) which is in good condition.
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 method of press-out of a wound pack from a first stator case and of press-in into a second stator case, in a continuous sequence, said method comprising the steps of:
a. first step of installing said first stator case on a hydraulic press base
plate, said base plate involving a hydraulically operating cam shaft
adapted to be co-axial with said installed first stator case;
b. second step of installing said second stator case, having a wound pack
that is to be pressed out, on said first stator case;
c. third step of raising said cam shaft, from said base plate to a desired
height such that it is enveloped, coaxially, by said first stator case and
said second stator case;
d. fourth step of using a cup to press said wound pack from said second
stator case to said first stator case in an operative downward direction;
e. fifth step of inserting said cup into said cam shaft;
f. sixth step of locating at least a spacer element on said cam shaft, said
spacer element being locked on to said cam shaft locking plate;
g. seventh step of bringing out lead wires from the operative bottom of
said first stator case and holding said lead wires, while the cam shaft
arm is being lowered; and
h. eighth step of lowering said cam shaft,
thereby, resulting in press-out of said wound pack from said second stator case and in press-in of said wound pack into said first stator case, in a continuous manner.

2. A method as claimed in claim 1 wherein, said step of hydraulically operating said cam shaft comprising the step of operating said cam shaft by means of air pressure.
3. A method as claimed in claim 1 wherein, said step of installing said first stator case on a hydraulic press base plate comprising the step of installing a good stator case on said hydraulic press base plate.
4. A method as claimed in claim 1 wherein, said step of installing said second stator case, having a wound pack, comprising the step of installing a bad or faulty or damaged stator case, having a wound pack.
5. A method as claimed in claim 1 wherein, said step of installing said second stator case, having a wound pack, on said first stator case, comprising the step of co-axially installing said second stator case, having a wound pack, on said first stator case.
6. A method as claimed in claim 1 wherein, said cam shaft is a spindle arm.
7. A method as claimed in claim 1 wherein, said step of hydraulically operating said cam shaft comprising the step of operating said cam shaft by pneumatic pressure.
8. A method as claimed in claim 1 wherein, said step of using a cup comprising the step of obtaining said cup from a fixture which is used for pressing the wound pack into a stator case.

9. A method as claimed in claim 1 wherein, said step of inserting said cup comprising the step of arranging said cup so that it rests on said second stator stamping portion of said wound pack.
10. A system for press-out of a wound pack from a first stator case and of press-in into a second stator case, in a continuous sequence, said system comprising:
i. hydraulic press base plate adapted to install said first stator case to receive a wound pack that is to be pressed in, said base plate further comprising a hydraulically operating cam shaft adapted to be co-axial with said installed first stator case, said cam shaft adapted to be hydraulically raised and lowered;
ii. second stator case, having a wound pack, on said first stator case;
iii. cup adapted to press said wound pack from said second stator case to said first stator case in an operative downward direction; and
iv. at least a spacer element on said cam shaft, said spacer element being locked on to said cam shaft locking plate.
11. A system as claimed in claim 10 wherein, said hydraulically operating cam shaft is an air pressure operated cam shaft.
12. A system as claimed in claim 10 wherein, said hydraulically operating cam shaft is an pneumatic pressure operated cam shaft.
13. A system as claimed in claim 10 wherein, said second stator case is a bad or faulty or damaged stator case.

14. A system as claimed in claim 10 wherein, said first stator case is a good stator case adapted to receive a wound pack.
15. A system as claimed in claim 10 wherein, said second stator case is a bad or faulty or damaged stator case adapted remove a wound pack.
16. A system as claimed in claim 10 wherein, said cam shaft is a spindle arm.
17. A system as claimed in claim 10 wherein, said cup is a fixture cup obtained from a fixture which is used for pressing the wound pack into a stator case.