Hi guys,
I have ordered one of these pumps via eBay..
https://www.ebay.co.uk/itm/1-2-800L...Circulation-Water-Pump-Tools-100/322946395973
but thinking that 800L/H maybe too fast to cope with what I have planned.
My question is, Is it possible to construct a simple circuit maybe with a potentiometer and transistor like this...



(or something similar) to regulate the speed of a Brushless Motor/Pump so that it will give a reduced litres per hour to about between 400 and 800 L/H or does it need a PWM speed controller such as this?...
https://www.ebay.co.uk/itm/PWM-DC-6...ew-Switch-Speed-Controller-WST05/302320673539

What are your suggestions to control the speed of this brushless pump and subsequently reduce the litres per hour?
Thanks

 

Your circuit would be very non linear, temp and V sensitive.

PWM approach is preferred.

Some approaches -

http://www.cypress.com/documentatio...8ckit-037-psoc-4-motor-control-evaluation-kit

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=12&ved=0ahUKEwiap8aY7MPbAhWM1IMKHX_2CtIQFgiWATAL&url=http://ww1.microchip.com/downloads/en/appnotes/00857a.pdf&usg=AOvVaw1QjAbr-lpNZcTKnT-N0N1N

On ebay lots of BLDC offerings.

Regards, Dana.

 

You can also reduce the rate of flow with a restrictor on the output, it also reduces motor current.
http://www.pumpfundamentals.com/centrifugal-pump-tips.htm
Max.

 

Necro-post; four years old. Problem likely solved. Or abandoned.

 

Why do we keep getting these artifacts???

 

Necro-post; four years old. Problem likely solved. Or abandoned.

Who resurrected it?

 

Hello,

In the old forum software one had to tick a box to be able to post a necropost.
This tickbox now is gone and a necropost is more easy made.
When the necropost adds nothing to the thread or is spam, I will detele the post.
In this case I removed a spammer.

Bertus