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Introduction to DC brushless water pump

Sources:Dongguan Shenpeng Electronics Co., Ltd  Release date: 2020-12-07  Browsing:

The brushless DC pump is a type of permanent magnet synchronous motor, not a real DC motor. Different from the brushed DC motor, the brushless DC pump does not use a mechanical brush device. It uses a square wave self-control permanent magnet synchronous motor, uses a Hall sensor to replace the carbon brush commutator, and uses neodymium iron boron as the permanent magnet material of the rotor. , Compared with the general traditional DC motor, it has great advantages in performance. It is the most ideal energy-saving brushless DC pump today.


brushless DC pump


The magnet and impeller of the brushless DC pump are molded into an integral part to form the rotor of the motor. There is a directly molded shaft sleeve in the middle of the rotor, which is fixed in the shell through a high-performance ceramic shaft. The stator and circuit board of the motor are sealed in the pump body with epoxy resin adhesive. There is a thin wall between the stator and the rotor, which does not need to be equipped with a traditional mechanical shaft seal, so it is completely sealed. The torque of the motor is driven by the magnetic field generated after the coil on the silicon steel sheet (stator) is energized to drive the permanent magnet (rotor) to work. The magnets are magnetized in n (n is even) order to form a complete coupled magnetic system. When the magnetic pole produced by the stator coil is opposite to the magnetic pole 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, that is, the displacement angle between the two magnetic poles Φ= 2 π/n, the magnetic energy of the magnetic system is the largest. After removing the external force, because the magnetic poles of the magnetic system repel each other, the magnetic force will restore the magnet to the lowest state of magnetic energy. Then the magnet produces motion, driving the magnetic rotor to rotate.


Brushless DC pump uses electronic commutation without using carbon brush. The magnet rotor and stator silicon steel sheet have multistage magnetic field. When the magnet rotor rotates an angle with respect to the stator, it will automatically change the direction of the magnetic pole, so that the rotor always keeps the same level of repulsion, so that the brushless DC magnetic isolation pump has high speed and efficiency.


The stator and rotor of the magnetic isolation pump are completely isolated, which completely avoids the liquid leakage problem of the traditional motor-type brushless DC pump. Moreover, it can be fully submerged and completely waterproof, effectively improving the service life and performance of the pump.


About Shenpeng:

Shenpeng, top1 supplier of BLDC mini pumps in China, has been specializing in the design & manufacture of DC pumps for 15 years. There are 300,000 class dust-free workshops with 3 fully automatic production lines and 5 SMT lines. Annual output is about 3 million pcs pumps. Adopt "Six Sigma", pursue product "zero defect".

Shenpeng has passed IATF16949, ISO9001, ISO14001 and OHSAS18001 and TUV. All products have passed CE, ROHS and REACH. Parts of pumps meet FDA, UL and EMC. Achieved more than 30 patents.


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