Problems with the rotor structure of shielded pumps
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The shielded pump used in our facility is experiencing an increase in vibration levels; upon disassembly and inspection, it was found that the bearings and shaft sleeves were damaged. However, when examining the motor rotor, it was found that the rotor had no magnetism. Is there anyone who can explain how a canned motor pump works? The rotor inside doesn’t have any magnetism – so how are the coils driven?
The rotor of a squirrel-cage motor rotates thanks to alternating current power supply, and no magnetism is required
Shielded pumps rely mainly on a magnetic field generated by the motor; when electricity is applied, the rotor rotates. Typically, the vibration level at the time of departure from the factory should be below 4.5 mm/s to be considered acceptable. If the vibration increases over time, it is usually due to wear of the vulnerable components or excessive gaps. This problem is often caused by operation without sufficient liquid, or by impurities in the pipelines. For professional repair of shielded pumps: 15242535301