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In a normal (centrifugal) pump you'd have a motor turning a shaft, then the shaft going through into an enclosed space where the pump wheel/impeller/rotor would sit.

It's a simple enough design, but it relies on a good seal where the axle passes from the pump housing to the motor.

And creating that seal can be difficult. It needs to be tight enough not to leak while still allow the axle to turn freely. It should last for ages too. Tricky.

"Magnetic drive" for pumps refers to that instead of having a drive shaft going through the pump housing to the motor, what connects the pump to the motor is a powerful magnetic field. This field acts straight through the wall of the pump housing.

Basically there's one magnet stuck to the pump wheel/impeller/rotor and another to the spinning end of the motor. And just like you can "magically" move a magnetic object on top of a table by moving another magnet underneath the table, the pump wheel will spin with the motor, even though there's no material connection between them.

This lets you use a fully enclosed pump housing w/o any axle seals that can wear out and leak. Quite clever.

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10y ago

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