Brushless DC speed regulating water pump, PWM speed regulating principle of three-phase brushless DC speed regulating water pump

PWM speed regulating water pump means that the speed of the water pump can be changed through PWM, thereby changing the head, flow and other parameters of the water pump. This speed-regulating water pump is a high-end product of the micro pump type.

PWM water pumps have two speed-adjustable models:

1. Adjust the input voltage directly through PWM.

2. The input voltage of the water pump remains unchanged. The water pump uses a sensorless program driver (three-phase sensorless driver) to directly input the PWM speed regulation signal to the control MCU.

The water pump includes FG feedback control signal, forward and reverse control signal and emergency brake signal port. It is very easy to realize automation and is widely used in instruments, equipment, automobiles and circulatory systems with intelligent requirements. The control circuit of the water pump can accept FG signals to achieve closed-loop control.

The detailed explanation of PWM control is as follows:

PWM is the abbreviation of "Pulse Width Modulation" in English. "Pulse width modulation" is simply called pulse width modulation. It is a very effective technology that uses the digital output of a microprocessor to control analog circuits. It is widely used in many fields such as measurement analysis, power control and conversion, etc. An analog control method that modulates the bias of the transistor gate or base according to changes in the corresponding load to achieve changes in the output transistor or transistor conduction time of the switching regulated power supply. This method can make the power supply output voltage under working conditions. Stay constant when changing.

PWM is a method of encoding the level of an analog signal. Through the use of high-resolution counters, the duty cycle of the square wave is modulated to encode the level of a specific analog signal. The PWM signal is still digital because at any given moment, full DC power is either present (ON) or not at all (OFF). A voltage or current source is a repetitive sequence of ON or OFF pulses that is applied to a simulated load. When it is on, it is when the DC power supply is added to the load, and when it is off, it is when the power supply is disconnected. As long as the bandwidth is sufficient, any analog value can be encoded using PWM.

For the DC60 series speed regulating water pump, the level amplitude of the PWM signal is 5V, and the frequency range is between 40~400HZ.

If you don't use the FG feedback signal and PWM function of the speed regulating pump, it can still operate normally and be used like an ordinary micro pump. But compared with ordinary pumps, it has extremely low interference, long life, and has self-protection functions, such as overvoltage protection, reverse connection protection, stuck protection, and overheating protection.