What is the working principle of a DC pump?

Disadvantages: As long as the motor rotates the carbon brush, bai will produce du wear. When the water pump runs to a certain extent, the carbon brush wear gap becomes larger and the sound will increase. After hundreds of hours of continuous operation, the carbon brush will not work The role of commutation.
Advantages: low price. The motor-type brushless DC pumpDC Water Pumps Suppliers in China is composed of a brushless DC motor and an impeller. The shaft of the motor is connected to the impeller.
Disadvantages: There is a gap between the stator and the rotor of the water pump. After a long time of use, the water will penetrate into the motor and the motor will easily burn out.

Advantages: The brushless DC motor has been standardized and mass-produced by specialized manufacturers, with relatively low cost and high efficiency. The magnet and impeller of the brushless DC magnetic drive pump are injection molded to form the rotor of the motor. There is a shaft sleeve directly injection molded in the middle of the rotor, which is fixed in the shell by a high-performance ceramic shaft. The stator and circuit board of the motor are made of epoxy resin. The glue is potted in the pump body, and there is a thin-walled isolation between the stator and the rotor, and there is no need to match with a traditional mechanical shaft seal, so it is completely sealed. The torque of the motor is the magnetic field generated by the coil on the silicon steel sheet (stator) to drive the permanent magnet (rotor) to work.　The magnet is magnetized in n (n is an even number) stages so that the magnet parts form a complete coupling magnetic system. When the magnetic poles generated by the stator coils are opposite to the magnetic poles of the magnet, that is, the displacement angle between the two magnetic poles Φ=0, the magnetic energy of the magnetic system is the lowest; when the magnetic poles rotate to the same pole, the displacement between the two magnetic poles The angle Φ=2π/n, the magnetic energy of the magnetic system is the maximum at this time. After removing the external force, since the magnetic poles of the magnetic system repel each other, the magnetic force will restore the magnet to the lowest magnetic energy state. Then the magnet moves and drives the magnetic rotor to rotate.
The brushless DC water pump adopts electronic commutation and does not need to use carbon brushes. The magnet rotor and the stator silicon steel sheet have multi-level magnetic fields. When the magnet rotor rotates an angle relative to the stator, the magnetic pole direction will be automatically changed, so that the rotor always maintains the same level of repulsion So that the brushless DC magnetic isolation pump has a higher speed and efficiency.
The stator and rotor of the magnetic isolation pump are completely isolated, completely avoiding the liquid leakage problem of the traditional motor-type brushless DC pump. And it can be used completely submerged and completely waterproof, which effectively improves the service life and performance of the pump.
Advantages: long life, low noise up to 35dB or less, can be used for hot water circulation. The stator and circuit board of the motor are potted with epoxy resin and completely isolated from the rotor. They can be installed underwater and are completely waterproof. The shaft of the water pump adopts a high-performance ceramic shaft with high precision and good shock resistance.