What is the working principle of a magnetic pump?

Take a look at Baidu Images. You can think of it as enclosing a part of the motor inside the pump head, which prevents leakage; the magnet on the outside drives the rotation inside. I’m not sure if that’s correct

Through the principle of like poles repelling and opposite poles attracting, the torque of the motor is transmitted to the internal rotor enclosed by the isolation sleeve

A magnetic pump consists of three parts: the pump, the magnetic drive, and the motor. The key component, the magnetic drive, consists of an outer magnetic rotor, an inner magnetic rotor, and a non-magnetic isolation sleeve. When the electric motor drives the external magnetic rotor to rotate, the magnetic field can penetrate the air gap and non-magnetic materials, causing the internal magnetic rotor connected to the impeller to rotate synchronously. This enables contactless transmission of power, transforming dynamic sealing into static sealing. Since the pump shaft and the internal magnetic rotor are completely enclosed by the pump body and the isolation sleeve, the problems of leakage are completely resolved, eliminating the safety risks associated with the leakage of flammable, explosive, toxic, and harmful substances through the pump seals in the oil refining and chemical industry.

A magnetic pump should actually be called a magnetically driven pump. The impeller of the pump is a conventional hydraulic component, but the pump shaft is separated in the middle; the power from the motor is transmitted to the impeller through non-contact magnetic force. The reason for zero leakage is that the traditional dynamic seal has been replaced by a static seal.

It’s not difficult to understand: a magnetic pump is also a type of centrifugal pump, where the rotation of an external magnet drives the rotation of an internal magnet, and it is this internal magnet that in turn causes the impeller to rotate