Variable sped drive for a pump motor in a shower

[schnell]

Hi,

Do you have any suggestions for a motor and a variable speed drive combination for a pump for a domestic shower?

We already have a fixed speed AC motor as a pump, but now we want to do variable speed drive.
(so people can have variable pressure shower water, as they choose)
Our fixed speed motor has a fan, so we cannot use this motor with a variable speed set-up, as the fan would spin too slowly at the lower pumping settings.

We also want to do it cheaply, so am i right in saying that we are looking at a thyristor drive?

We are thinking of say a 3-speed drive, or in fact we may consider a more widely variable speed drive, if its not too expensive.

I believe Triac drives are out becuase of the non-symetric nature of triacs.(?)

 

[waross]

Find a Variac (Continuously variable auto transformer) and try the motor on reduced voltage.

Bill
--------------------
"Why not the best?"
Jimmy Carter