Suspecting demagnetization of a magnetic pump – how to measure the strength of the magnetism
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The magnetic pump in use at the site fails to reach the previous pressure after being started up; upon disassembly, it was found that the magnetic force between the inner and outer magnets had decreased. It is preliminarily assumed that once a certain pressure is reached, the inner and outer magnets separate from each other, meaning the outer magnet can no longer pull the inner magnet. I am seeking advice from fellow enthusiasts: how can one measure the magnitude of the magnetic force between the inner and outer magnets? Thank you. I believe that by using a torque wrench to rotate the motor, it is possible to prevent the inner magnet from rotating; the torque at the moment when the outer magnet starts to rotate is then equal to the torque between the two magnets. However, this method is difficult to implement in practice{:3_52:}
It seems there’s no specific way to determine the exact magnitude of magnetism. When I used to repair magnetic pumps, I would try using an iron wrench to gauge the suction strength, relying on intuition. And you said that the pressure of the magnetic pump is insufficient; excluding the possibility of wear on the impeller, it means that the magnetic drum has experienced demagnetization. Personal experience is for reference only.
Learn about it; I’ve never encountered such a problem
For experienced craftsmen, they can use hand-held iron tools to test the suction strength; those who find it convenient can use a measuring device
Demagnetization has a reason for it; you need to find out what is causing the problem, otherwise it will demagnetize again even after replacement
If demagnetization occurs, it’s either because there are magnetic contaminants in your medium or because the temperature exceeds the limit.