When the driven parts of the magnetic drive are running under overload or the rotor is stuck, the main and driven parts of the magnetic drive will automatically slip off to protect the machine pump. At this time, the permanent magnet on the magnetic drive will produce eddy loss and magnetic loss under the action of the active rotor alternating magnetic field, resulting in the temperature of the permanent magnet rising and the slippage failure of the magnetic drive.

Precautions for magnetic pump operation:

  1. Prevent dry friction. (1) Idling is strictly prohibited. (2) It is strictly prohibited to evacuate the medium. (3) When the outlet valve is closed, the continuous operation time of the pump shall not exceed 2min to prevent the magnetic drive from overheating and failing.
  2. Prevent particles from entering. (1) No ferromagnetic impurities or particles are allowed to enter the magnetic drive and bearing friction pair. (2) The medium that is easy to crystallize or precipitate should be washed in time to ensure the service life of the plain bearing. (3) When conveying the medium containing solid particles, it should be filtered at the inlet of the pump flow pipe.
  3. Prevent demagnetization. (1) The magnetic torque cannot be designed too small. (2) It should be operated under the specified temperature conditions, and the medium temperature is strictly prohibited. A platinum resistance temperature sensor can be installed on the outer surface of the magnetic pump isolation sleeve to detect the temperature rise in the ring gap area, so as to alarm or stop when the temperature exceeds the limit.