A project log for BLDC Variable Speed Water Pump

Increasing the chooch factor on an offshore water pump. Ladies and Gents, I give you Franken pump.

Andrew MayhallAndrew Mayhall 02/05/2018 at 01:250 Comments

So, this is the part everyone has been waiting for. Franken Pump drinks its first blood. And by blood I mean.... wait, Frankenstein doesn't drink blood... 

Anyways! Horrible humor aside.. The operation of this pump is exciting! 

It's probably easier for everyone to just watch the video. I'll shut up. 

So the end results are pretty great. Approximately 643GPH at max flow using a 24V power supply. 

During the planning section I calculated the BLDC motor would require about 26v to match the RPM of the original motor. This certainly accounts for the flow rate reduction. 

I am trying to source a 36v power supply which should let me "over drive" the pump substantially producing a higher flow rate and potentially higher head pressures. The trade-off here will be the likely formation of cavitations on the impeller blades... But I'll worry about that at another time! haha

Thanks again for sticking around during the build of this pump. Feel free to chime in on the discussions and  stay tuned for more updates! 

Hope you enjoyed!