Control speed of a water pump AC 220V

Other Hardware General Electronics
1

Hello,

To control a water pump AC 220V i have done this https://cdn3.astuces-pratiques.fr/imagesarticles/24/piloter-un-triac-avec-arduino-ou-pic.png

It works fine but now i want to control the speed of the pump. can i connect this schema in the analog pin or PWM ? what change a i have to make ?

Thank you for your help

2

You need an AC Variable Phase Controller (also referred to as dimmer but light dimmer circuits may be different than motor speed controller circuits)

PWM only works for DC so it's not an option for AC.

3

Most water pumps are designed to operate at a design speed. The normal way to reduce the water pressure/flow from a water pump is to send some of the water from the output port back into the pump input port using a valve of some type.

What are you trying to do?

Paul

4

Control the flow, not the pump speed.

Use a T junction on the output, with a valve to divert some of the output flow back to the input. That reduces the back pressure and the pump will consume less power.

5

It's generally called a "bypass valve" but functions as a flow control. It's not called a flow control because it is not simply a variable valve in line with the output. It is a "T" valve that can divert the flow completely
from one output to the other (a short section of hose connects the output of the center of the "T" back to another "T" on the Return line. Thus the flow can be varied from 100% to the load to a 100% to the Return, effectively creating a flow control. make sure the hose is rated for the pump pressure or it will blow up like a balloon and make a really loud bang !. (don't ask me how I know that :wink: )