1. When the isolation sleeve is made of non-conductor material, the matching motor power can be determined according to the general centrifugal pump method, as long as the power margin is appropriately larger.
2. When the core release sleeve is made of metal material, the eddy current loss power will significantly increase the shaft power of the pump, the capacity of the matching electric pump will increase, and the total efficiency of the magnetic pump will decrease significantly. Therefore, to control the eddy current loss power, it cannot be made too large. To achieve this goal, on the one hand, there must be a good magnetic circuit design and structural design; on the other hand, there must be a reasonable matching relationship between the magnetic power and the motor power.
In addition to considering the general centrifugal pump, the matching motor power of the magnetic pump should also consider the friction power consumed by the high-speed rotation of the permanent magnet inner rotor in the ferry body conveyed by the pump and the eddy current loss power that may be generated by the isolation sleeve.
The friction work consumed by the high-speed rotation of the permanent magnet inner rotor is related to the rotational speed, the viscosity of the liquid, the diameter and length of the inner rotor, and the size of the gap between the outer surface of the inner rotor and the isolation sleeve. This friction work is generally not too large, but when the liquid retort is large, it cannot be ignored.
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