What is the working principle of high and low speed pump?
1. High speed pump
Drive mode: Usually brushless direct current motor (BLDC), because of its high efficiency, fast speed (up to thousands to tens of thousands of RPM), and no physical brush, longer life.

Pump body design: the use of centrifugal impeller structure, relying on high-speed rotation to generate centrifugal force, the fluid from the center to the outlet, forming continuous flow. High speed increases flow and head, but requires a precise dynamic balance design to reduce vibration.
Control characteristics: Rely on electronic speed regulation (such as PWM) to adjust the speed, fast response, suitable for dynamic load requirements.
2. Low speed pump
Drive mode: Brush DC motor or reduction gear motor is often used, and the speed is low (several hundred to thousand RPM). Brush motor structure is simple, but brush wear needs regular maintenance.
Pump design: A positive displacement structure (such as gear pumps, diaphragm pumps or peristaltic pumps) may be used to transport fluid through changes in the volume of the chamber. Low speed operation reduces shear force and is suitable for sensitive fluids.
Control characteristics: large torque, suitable for the need for stable pressure scenarios, but the speed range is narrow.

Whta is performance comparison?
Parameters High speed pump Low speed pump
High flow rate (dependent on speed) Low (but positive displacement pump stable output)
Medium-high lift (centrifugal lift is proportional to the square of speed) High (positive displacement pump can provide constant pressure)
Efficiency Higher efficiency at high speeds Lower efficiency possible at low speeds (gear loss)
High noise (noise reduction design required) Low (low speed to reduce vibration)
Long life of brushless motor (about 10,000 hours or more) Brushed motor needs to replace the brush regularly (about 1,000 hours)
3. Application environment
1. High speed pump
Scenes:
Large flow requirements: such as landscape fountains, circulating water systems, industrial cooling.
Limited space: High power density suitable for drone spraying, portable equipment.
Dynamic adjustment: car wiper cleaning, laboratory instruments need to respond quickly.
Advantages: small size, light weight, suitable for mobile equipment; High efficiency and energy saving.
Limitations: Loud noise and high speed may damage granular fluids.
2. Low speed pump
Scenes:
High head/pressure requirements: solar irrigation, water supply for high-rise buildings.
Sensitive fluid delivery: Medical equipment (such as dialysis machines), food processing (to avoid shear damage).
Quiet environment: aquarium filter, indoor humidifier.
Viscous medium: lubricating oil, mud transport (positive displacement pump).
Advantages: Smooth operation, suitable for high-precision control; Maintenance is simple.
Limitations: large volume, limited flow.

What is the selection suggestions?
Choose high speed pumps: When compact design, high flow rate, fast response, and noise sensitivity are required.
Choose low speed pumps: in situations where stable pressure is required, quiet operation is required, viscous or sensitive fluids are handled, or equipment is continuously operated for long periods of time.
3" DC SS IMPELLER SOLAR PUMP