1. Brushed DC solar water pump:
When the water pump is working, the coil and commutator rotate, the magnetic steel and carbon brush do not rotate, and the alternating change in the direction of the coil current is completed with the commutator and brushes rotating by the motor
As long as the motor rotates the carbon brush will produce wear, the computer water pump runs to a certain time, the carbon brush wear gap becomes larger, the sound will also increase, continuous operation
After hundreds of hours, the carbon brush cannot play the role of commutation.
Pros: Low price.
2. Brushless DC solar water pump (motor type):
The motor type brushless DC water pump is composed of brushless DC motor and impeller. The shaft of the motor is connected to the impeller, between the stator and rotor of the pump
There is a gap, and water will penetrate into the motor after a long time, increasing the possibility of motor burnout.
Advantages: brushless DC motors have been standardized, there are special manufacturers for mass production, the cost is relatively low, high efficiency.
3. Brushless DC magnetic isolated solar water pump: The brushless DC water pump adopts electronic component commutation, no need to use carbon brush commutation, using high-performance wear-resistant ceramic shaft and ceramic bushing, the shaft sleeve is connected to the magnet through injection molding to avoid wear, so the life of the brushless DC magnetic water pump is greatly enhanced. The stator part and rotor part of the magnetic isolation water pump are completely isolated, the stator and circuit board part are potting, 100% waterproof, the rotor part adopts permanent magnet, the pump body adopts environmentally friendly materials, low noise, small size and stable performance. Various required parameters can be adjusted by winding the stator, and a wide voltage operation is possible.
Advantages: long life, low noise up to 35dB or less, can be used for hot water circulation. The stator and circuit board part of the motor are potted with epoxy resin and completely isolated from the rotor, which can be installed underwater and are completely waterproof, and the shaft of the pump adopts a high-performance ceramic shaft, which has high precision and good shock resistance.