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 fixture gauge for inspecting a wound pack of a stator body of electrical equipment
APPLICANTS (S)
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR (S)
Yelulkar Nandkumar Tipanna of Crompton Greaves Ltd, LT Motors Division, A/6-2, MIDC Industrial Area, Ahmednagar - 414111, Maharasthra, 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 fixture gauge for inspecting a wound pack of a stator body of electrical equipment.
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 motor is, then, locked with a pin to obtain a fit with an optimized tightening process.
In a stator assembly, the windings may be required to be made in accordance with design parameters of size and shape. Before dipping the wound pack, in a varnish, it is checked. According to the prior art, an overhang ring is used to check as well as to shape the overhang of wound pack.
There is no check for overhang length, lead wire position, and cleat position with respect to leads of the wound pack. These issues reflected in Test Bed Rejection analysis as HV Failure.
From the wound pack, six lead wires go to a Terminal Box. These lead wires are in two pairs; Ul, VI, Wl, and U2, V2, W2. These lead wires may overlap, if not

checked, resulting in test failure of the wound pack. A pre-determined gap should be maintained between the two pairs. This gap should be optimum; not more not less. If the gap is less, chances of lead damage increases. If the lead position is not correct, a pressman has to be shift lead position to avoid dowell pin hole on stamping cleat. If there is excess lead gap, then lead wire may damage while pressing as E/S touches lead wire.
Dowel pins are used for fixing stator to wound pack. The dowel pin, ideally, should not be at the cleat or notch of the wound pack.
Also, overhang may touches end-shield due to excess overhang length. There have been a lot of rejections in wound packs during assembly due to overhang touch on other motor components. It was identified that due to lack of controlled dimensions and shape of the overhang, the overhang of the prior art touches either end shields or rotor after assembly and consequently results into wound pack failure.
According to the prior art techniques and apparatus, there was no control over the overhang dimensions.
It was purely operator skill dependent. Hence, the overhang shape formed was irregular. There was tedious manual operation involved. The cycle time for making was very high. There were more wound pack rejections due overhang touch problem.
The gauge, according to the prior art, which is used for inspection of winding overhangs checks only inner diameter and outer diameter of the overhangs. This gauge and method is not suitable to check overhang length, lead wire gap, and lead

wire position. Hence, there was a need to provide a fixture gauge to check the wound pack for pre-determined parameters relating to desired dimensions and placements to avoid wound pack failures and obviate the above problems.
OBJECTS OF THE INVENTION:
An object of the invention is to provide a fixture gauge to check a wound pack overhang during wound pack manufacturing, which results into forming the over hang accurately.
Another object of the invention is to provide a fixture to form a wound pack overhang during wound pack manufacturing, which results into forming the over hang with exact pre-determined dimensions.
Another object of the invention is to provide a fixture to form a wound pack overhang during wound pack manufacturing, which eliminates over hang touch problems.
Yet another object of the invention is to provide a fixture to form a wound pack overhang during wound pack manufacturing, which reduces manual operations.
Still another object of the invention is to provide a fixture to form a wound pack overhang which fixture checks the overhang length of the winding.
An additional object of the invention is to provide a fixture to form a wound pack overhang which fixture checks the lead wire position with respect to cleat.

Yet an additional object of the invention is to provide a fixture to form a wound pack overhang which fixture checks the lead gap between the two pairs of lead wire bunches (Ul, VI, Wl, and U2, V2, W2).
SUMMARY OF THE INVENTION:
According to this invention, there is provided a fixture gauge for inspecting a wound pack of a stator body of electrical equipment, said fixture gauge comprises: a first ring with a pair of adjacently located notches, said notches including a first notch and a second notch adapted to receive at least a lead wire respectively, said notches being parallel to each other and having a pre-defined depth and further being parallel to the axis of said ring with the distance between said notches being pre-defined and adapted to form a spacer element between said two notches.
Typically, height of said first ring is pre-defined in accordance with overhang height.
Typically, the operative proximal or outer rim of said first ring includes a pre-located marked slot to check cleat position with respect to Dowell pin, such that there is mismatch between said cleat position with respect to said Dowell pin.
Preferably, said spacer element is of 25mm breadth.
Typically, said gauge comprising a second ring co-axial to said first ring, said second ring being spaced apart from said first ring in an operative distal direction, said ring being fitted on overhang ring to check length of said overhang.

Typically, the operative proximal or outer rim of said first ring includes a pre-located marked slot, said pre-located marked slot determined to be at 90 degree of lead wire position strip to check Dowell pin position.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
This invention will now be described in relation to the accompanying drawings, in which:
Figure 1 illustrates a first view, from an operative distal end, of a fixture gauge for inspecting a wound pack of a stator body of electrical equipment;
Figure 2 illustrates a second view, from an operative proximal end, of a fixture gauge for inspecting a wound pack of a stator body of electrical equipment; and
Figure 3 illustrates a portion of the fixture gauge, for inspecting a wound pack of a stator body of electrical equipment, placed on a wound pack depicting its cleat.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
According to this invention, there is provided a fixture gauge for inspecting a wound pack of a stator body of electrical equipment.
Figure 1 illustrates a first view, from an operative distal end, of a fixture gauge (100) for inspecting a wound pack of a stator body of electrical equipment.

Figure 2 illustrates a second view, from an operative proximal end, of a fixture gauge (100) for inspecting a wound pack of a stator body of electrical equipment.
Figure 3 illustrates a portion of the fixture gauge, for inspecting a wound pack of a stator body of electrical equipment, placed on a wound pack depicting its cleat.
In accordance with an embodiment of this invention, there is provided a first ring (12) with a pair of adjacently located notches (14, 16), The notches are a first notch (14) and a second notch (16). These notches (14, 16) are parallel to each other and have a pre-defined depth. These notches (14, 16) are parallel to the axis of the ring (12). The distance between the notches (14, 16) is pre-defined and forms a spacer element (18) between the two notches (14, 16). Each of the notches (14, 16) receives a bunch of lead wires. A first notch (14) is for a first bunch of lead wires (Ul, VI, Wl). A second notch (16) is for a second bunch of lead wires (U2, V2, W2). The spacer element (18) is for determining the gap between the first bunch of lead wires with respect to the second bunch of lead wires. The height of this first ring (12) is pre-defined. The operative proximal or outer rim of the first ring includes a pre-located marked slot (22) to check cleat (26) position with respect to Dowell pin. The spacer element (18) is, typically, of 25mm breadth.
In accordance with another embodiment of this invention, there is provided a second ring (24) which is co-axial to the first ring (12). This second ring (24) is spaced apart from the first ring (12) in an operative distal direction. This ring (24) is fitted on overhang ring to check length of the overhang.
In order to use this fixture gauge (100) appropriately, and in accordance with this invention, the first bunch of lead wires is placed in the first slot (14) and the second

bunch of lead wires is placed in the second slot (16). This ensures pre-defined gap between the bunches of lead wires. The fixture gauge (100) is pressed manually over the overhang so that the outer rim of the first ring (12) easily touches the stamping pack. If this does not happen, then it can be determined that overhang length is high.
Further, the pre-located marked slot (22) is determined to be at 90 degree of lead wire position strip to check Dowell pin position. The pre-located marked slot (22) should not come on the cleat i.e. the pre-located marked slot represents position of Dowell pin in the stator case.
Therefore, the following checks can be performed to determine overhang position and structure:
1) overhang length of the winding;
2) gap between bunches of lead wires (U1-V1-W1 and U2-V2-W2); and
3) lead wire position with respect to cleat on wound pack.
The following advantages are proposed due to the fixture gauge of this invention, which result in reduction in Test Bed Rejection of HV failure at the time of motor assembly due to:
a) Longer lead end overhangs leading to touching it to the endshield;
b) Fouling of Dowell pin with cleat of stator pack if the position of cleat is at 90 deg with respect to the lead position; and
c) Touching of the lead wires to the landing bar in Terminal Box opening of if the gap between them is not maintained.

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 fixture gauge for inspecting a wound pack of a stator body of electrical
equipment, said fixture gauge comprising:
first ring with a pair of adjacently located notches, said notches including a first notch and a second notch adapted to receive at least a lead wire respectively, said notches being parallel to each other and having a predefined depth and further being parallel to the axis of said ring with the distance between said notches being pre-defined and adapted to form a spacer element between said two notches.
2. A fixture gauge as claimed in claim 1 wherein, height of said first ring is predefined in accordance with overhang height.
3. A fixture gauge as claimed in claim 1 wherein, the operative proximal or outer rim of said first ring includes a pre-located marked slot to check cleat position with respect to Dowell pin, such that there is mismatch between said cleat position with respect to said Dowell pin.
4. A fixture gauge as claimed in claim 1 wherein, said spacer element is of 25mm breadth.
5. A fixture gauge as claimed in claim 1 wherein, said gauge comprising a second ring co-axial to said first ring, said second ring being spaced apart from said first ring in an operative distal direction, said ring being fitted on overhang ring to check length of said overhang.

6. A fixture gauge as claimed in claim 1 wherein, the operative proximal or outer rim of said first ring includes a pre-located marked slot, said pre-located marked slot determined to be at 90 degree of lead wire position strip to check Dowell pin position.