Rotor remanufacturing is a more complex service that we provide to partners and customers around the world.
Typically, a rotor is damaged by foreign matter (impurities) in the wrong place, or simply by time and stress, the underlying materials can no longer withstand the rotational speed.

Magnetic field mapping

When the rotor is accepted, we first carry out a magnetic field mapping and assess the damage to the magnetic field (for this we have developed the
our own magnetic field mapping device:

  • use the device to create a magnetic field map,
  • locate the fault (usually a damaged magnet or several magnets), which is visible as a graphical anomaly on the displayed magnetic field map.

Mapping is part of the standard service procedure, which in many cases avoids unnecessary service costs.
It is often difficult to tell by eye what is wrong with an engine, especially if it is running and not giving 100 % of its power.
Without prior mapping, any workshop would have tackled the problem by stripping down the complete engine and identifying any deviations from factory specifications.
However, when the engine is reassembled and tested, it is usually found that it still does not work (despite a complete rebuild, replacement of bearings …).
We have already incurred the cost of the service, but the fault is still not rectified.
It is usually only at this stage that we get to the next stage of finding the problem.

Disassembling the rotor

  1. Remove the bandage,
  2. remove the magnets,
  3. clean the surface.

If the magnets are damaged, we will make new ones.
We draw up a plan with precise dimensions and take into account all the necessary parameters (magnetic field strength).
Once the magnets are made, the next step is to proceed.

Reassembly

  1. Make new magnets, magnetise them and stick them to the surface,
  2. the magnets are protected and wrapped in a bandage,
  3. the rotor is balanced.

Once the rotor is assembled, we insert it into the stator and assemble the motor.
This is followed by output testing and a service report.
If the rotor is too basically destroyed to be worth rebuilding, we build a completely new rotor with exactly the same parameters as the original.