Brushless DC water pump (two-phase DC) speed regulation method：
Two-phase ordinary water pump speed can be adjusted by adjusting the input voltage to change the power of the pump, or by inputting a PWM adjustable duty cycle power supply. This method is relatively expensive, and the speed adjustment by changing the voltage is not conducive to implementation. Intelligent control of water pump.
Three-phase dc pump wiring diagram：
Potentiometer speed control wiring method: (non-speed control water pump does not lead out the speed control signal line)：
The red wire in the speed control interface is positive 5V, the yellow wire is the speed control signal wire, the black wire is the ground wire, the red and black wires are connected to the two ends of the potentiometer, and the yellow wire is connected to the middle of the potentiometer, so that the potentiometer can be rotated. The voltage of the yellow wire is slid between 0-5V, so that the potentiometer is used to realize the speed adjustment between 0-5V. Do not touch the red wire and the black wire together, which will easily cause the circuit board to burn out. The potentiometer speed control is the same as the VR (0-5V) speed control. If the VR speed control is used, you only need to remove the potentiometer. Just connect according to the VR speed regulation method.
Wiring method for PWM or analog signal VR (0-5V) speed regulation:
PWM (50-800HZ signal amplitude is 5v) or analog signal (0-5V) speed control only needs to connect the yellow wire in the speed control interface to the speed control signal generating port of the external control system (PWM or 0-5V), Connect the black wire to the system ground wire and leave the red wire in the air.
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