A canned motor pump is a combination
of a centrifugal pump and a squirrel cage induction motor
built together into a single hermetically sealed unit. The
pump impeller is normally of the closed type and is mounted
on one end of the rotor shaft that extends from the motor
section into the pump casing. The rotor is submerged in the
fluid being pumped and is therefore "canned" to
isolate the motor parts from contact with the fluid. The stator(C)
is also "canned" to isolate it from the fluid being
pumped. Bearings(D) are submerged in system fluid and are,
therefore, continually lubricated.
The canned motor pump has only one moving part, a combined
rotor-impeller assembly that is driven by the magnetic field
of an induction motor. A portion of the pumped fluid is allowed
to recirculate through the rotor cavity to cool the motor
and lubricate the bearings. The stator windings and rotor
armature are protected from contact with the recirculating
fluid by a corrosion resistant, non-magnetic, alloy liner
that completely seals or "cans" the stator winding.
Modifications to the recirculation flow system are available
to allow canned motor pumps to be used in any application
including fluids up to 842¡ÆF (450¡ÆC), volatile liquids, and
liquids with solids.
For more information on canned motor pumps, please download
materials of canned motor pumps in Customer Manu.