The working principle of a brushless DC water pump is based on the magnetic effect of current and the electronic control system. It adopts the basic principle of a brushless DC motor and achieves the promotion of water flow through the interaction between the electronic controller and the magnetic field and the rotor.

1. The following are the main working principles of a brushless DC water pump:

1. Electronic controller: The key to a brushless DC water pump is the electronic controller, which is responsible for controlling the current and magnetic field to ensure that the motor runs in the set manner. The electronic controller is generally composed of a microcontroller or a dedicated chip, which can monitor and adjust the control parameters of the motor.

2. Magnetic field generation: In a brushless DC water pump, a permanent magnet or a magnetic coil is usually used to generate a magnetic field. This magnetic field can be constant (based on permanent magnets) or variable (through current to control the magnetic coil).

3. Sensor: A brushless DC water pump is generally equipped with some sensors, such as Hall elements, to detect the rotor position and direction speed ratio. This sensor provides a control signal to the electronic controller, which can help accurately control the operation of the motor.

4. Current control: Based on the feedback provided by the sensor, the electronic controller controls the direction and size of the current to activate the different electromagnetic coils in the motor. By appropriately changing the state of the electromagnetic coil activity, the electronic controller can drive the rotor to rotate.

5. Rotor movement: As the current controls the activation of the magnetic coils, the generated magnetic field interacts with the permanent magnets in the rotor, generating torque. This torque drives the rotor to rotate, which drives the water flow.

6. Water flow promotion: DC brushless water pumps usually have components such as impellers or propellers to promote water flow by rotating the rotor. Water enters the pump housing at the inlet and is transported to the outlet through the function of the impeller or propeller to achieve water flow.

Through precise electronic control and the interaction between the magnetic field and the rotor, DC brushless water pumps can provide convenient, adjustable and low-noise water flow control.