CERotor is very crucial part in submersible motor and also in the operation of submersible Pump. Rotor is also called armature.
MOC (Material of Construction) of ROTOR:
The armature is disposed so as to be freely rotatable within a stator. The armature comprises: a motor shaft; a core secured to the motor shaft (i.e. called stamping) having slots extending in the axial direction. A motor shaft should be of S.S. 410/304; stamping and rod should be of copper, as the copper rotor is more efficient than aluminum.
PROCESSES
Balancing:
High speed rotor balancing is done at actual operating speeds, where rotor vibrations are excited by its residual unbalance. During balancing, very close attention is paid to other conditions which may be adversely affecting operation of the machinery. Any such conditions detected while balancing are addressed and resolved at the appropriate time with respect to the balancing program.
Machining:
This is the process to give finishing on the surface.
Grinding:
On the surface of rotor grinding is done.
Hard chrome:
A layer of chrome is applied on the surface to make the rotor wear resistant. Very less number of companies is doing this process to save some amount of cost. But this is critical process for the long life of Pumpset.
Copper Rotor V/S Aluminium Rotor
Some pump manufacturers try to save a few rupees and settle for aluminum rotors. We believe you cannot afford to operate without copper rotor construction. WHY???
The reasons are as below:
The use of copper for the conductor bars and end rings of induction motors in place of aluminum results in attractive improvements in motor energy efficiency.
The real test for rotor material is during starting because this is when the motor is subjected to extreme operating conditions. During this period, large AC motors can be rotor limited. This means that the rotor cage will reach its thermal limit before the stator winding. In this demanding period of operation, copper offers a significantly higher range of resistivity and a much higher thermal margin. Copper also provides a lower coefficient of expansion, higher tensile strength, and ideal conductivity. Without a doubt, copper rotor construction gives you greater reliability, efficiency, and versatility with which aluminum cannot compare.
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