Electronics &
Communication Technologies -
Canned Motor for Pump
Canned motors are Special prime movers used to drive
centrifugal pumps under submerged condition.
No Seal between pump and motor.
Stator and Rotor canned with SS cans.
Stator potting with high conductivity potting compound.
Pumping liquid lubricates and cools motor. This
is achieved by auxiliary impeller at the bottom.
Special Glass to Metal Seal for power connection.
Rotating and stationary parts of journal and thrust
bearing are made of Tungsten Carbide & Ceramic
respectively.
Introduction
Canned Motors are specifically designed prime movers
used to drive centrifugal type of pumps, under sub-merged
condition. Pumping liquid goes inside the motor also.
There is no seal between the motor and the pump. There
is no leakage of liquid to the outside atmosphere. These
canned motors for pumps are extensively used in chemical
& nuclear industry where costly, hazardous or radioactive
fluids are handled.
The pump is conventional one made of S.S. The special
kind of bush bearings used have pumping fluid itself
as lubricant and coolant. An auxiliary impeller is used
to cool stator & rotor of the motor. Special Glass
to Metal Seal is used for taking power connection to
the stator winding. The stator and rotor are canned
with SS cans. The stator is potted with epoxy so as
to provide backing to the stator can. The thermal conductivity
of epoxy is increased by adding silica granules. Special
care is taken for welding cans of dissimilar thicknesses
by using TIG or EB welding.
Specifications
Power Output
1.5 kW
3.75 kW
Speed
2900 rpm
2700 rpm
Efficiency
70% (approx.)
50% (approx.)
Power factor
0.8
0.8
Voltage
415 V
415 V
Phase
3
3
Full load current
6.0 amps
13.5 Amps
Size
OD
180 mm
230 mm
Length
400 mm
330 mm
Pump Head developed
1.8 kg/ cm 2
2 kg/ cm 2
Pump flow
3 m 3 /hr (50 lpm)
36 m 3 /hr (600 lpm)
Infrastructural Facilities Required
TIG welding facility
He leak testing unit
Winding facility
Epoxy Potting facility
General machining facility
Dynamic Balancing machine
For further information please
contact :
Head,
Technology Transfer & Collaboration Division,
Bhabha Atomic Research Centre,
Trombay, Mumbai - 400 085
Tel : 091-022-25505337/25593897
Fax : 091-022-25505151
E-mail : headttcd@barc.gov.in
