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The working principle of a DC submersible pump
2026-01-26
A DC submersible pump drives the impeller to rotate via a DC motor. Utilizing centrifugal force, the pump propels liquid (such as water) from the center of the impeller outward. As the liquid flows within the pump casing, its velocity gradually decreases while its pressure increases, eventually being discharged through the outlet. Based on the type of motor, these pumps can be categorized as follows:
Brushed DC submersible pump
The current direction is switched via carbon brushes and a commutator, driving the motor to rotate.
Advantages: low cost, simple structure.
Disadvantages: Carbon brushes are prone to wear and require regular replacement, with a relatively short lifespan (typically several hundred hours).
Brushless DC submersible pump
Using electronic commutation technology (such as Hall sensors or sensorless control), carbon brushes are not required.
Advantages: Long lifespan (up to tens of thousands of hours), low noise level (as low as below 35 dB), high efficiency, and excellent water resistance.
Category:
Brushless motor type: The motor shaft is directly connected to the impeller, and there is a gap between the stator and rotor. Prolonged use may result in water leakage.
Magnetic-drive isolated type: Torque is transmitted via magnetic coupling, with the stator and rotor completely isolated. The unit is encapsulated with epoxy resin for thorough waterproofing, making it suitable for high-temperature or corrosive liquid environments.
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Key Points for Selection, Installation, and Maintenance of DC Submersible Pumps
