This invention relates to a motor body for a bore well submersible motor.
Depending upon the ratings of the pump set the pressure developed during use will vary and the motor body has to withstand extreme conditions of the pressure developed.
In order to combat this problem, manufacturers commenced using stainless steel as a high strength material for the motor body. Accordingly stainless sheets of sufficient thickness were formed into tubes of the required size and welded at the manufacturers' premises and used as motor bodies. However, although these tubes were structurally safe, they were not able to withstand the vibration induced by the use of HDPE pipes as delivery' pipes at the outlet of the submersible pumpsets. This resulted in the failure of some of the components of the pumpset and often caused the total failure of the pumpset.
This invention therefore proposes to overcome the aforementioned
drawback.
This invention also has the following advantages:
Dampens the vibration of the discharge line and thereby permits the
use of cost effective material such as, HDPE pipes which have
better flow characteristics compared to G.I. pipes.
Combining mild steel and stainless steel effectively for getting
optimum strength and stability.
Reduction in weight of the motor.

Improvement in reliability.
Reduction in manufacturing cost. Achieves high productivity'.
The motor body for a bore well submersible motor, according to this invention, comprises a metal sheet formed into a tube, characterised by tubular metal inserts of predetermined lengths introduced into, at both ends of, the tube, such that the said inserts are snugly located within the tube; a plurality of grooves provided on the outer surface of the tube and of the inserts, at least two of the grooves on the inserts matching with the grooves on the tube.
This invention will now be described with reference to th
accompanying drawings which illustrate by way of exam pie, and not
by way of limitation, one of possible embodiments of this invention.
Fig. 1 illustrating the embodiment in sectional elevation
Fig.2 illustrating the section at AA in Fig. 3 of the insert
Fig. 3 illustrating the end view of the insert indicating the section line
AA.
A thin stainless sheet is formed into a tube 1 which constitutes the motor body. Tubular mild steel inserts 3 of predetermined lengths are introduced into, and at both ends of the tube 1, such that the said inserts are snugly located within the tube 1. These inserts also permit easy fitting of the pump adaptor and the thrust housing. To increase the structural stability of the thin walled stainless steel motor body, a plurality of grooves are provided on the outer surface of the tube 1? two of such grooves being located so as to arrest the

movement of the stator (motor body) and the others also serve to lock ,the stator in position. Two grooves are provided on the inserts 3 to match with the grooves on the motor body 1.
The grooves, in addition to giving structural rigidity to the motor body, also serve as stator positioners and allow stator locking in position at critical speed . besides enhancing the aesthetics of the motor.
The terms and expressions in this specification are of description and not of limitation, since this invention is not confined to the embodiment herein described and illustrated, but it is understood that various other embodiments of this invention are possible without departing from the scope and ambit of this invention.

We Claim:
1. A motor body for a bore well submersible motor comprising a
metal sheet formed into a tube, characterised by tubular metal
inserts of predetermined lengths introduced into, and at both
ends o£ the tube, such that the said inserts are snugly located
within the tube; a plurality of grooves provided on the outer
surface of the tube and of the inserts, at least two of the grooves
on the inserts matching with the grooves on the tube.
2. A motor body as claimed in Claim 1 wherein the metal sheet is
mode of stainless steel.
3. A motor body as claimed in Claim 1 or Claim 2 wherein the
inserts are made of mild steel.
4. A motor body for a bore well submersible motor substantially
as herein described with reference to, and as illustrated in, the
accompanying drawings.