That would be the case Ken. Most (what they call Variable Speed) household systems utilize small bladder tanks, which one would want to do, but they use much smaller pumps, which makes getting a glass of water much easier. The system would have an analog pressure transducer which connects to an input on the pump control. Once you set the pressure in the control, it will maintain that pressure from minimum flow to it's maximum flow when you turn the water on. The motor needs to change speed to do that.
Problem going with a larger well pump, is that the pump motor manufacturers state that you can not run these larger pump motors under the frequency of 30Hz for more that 1 second or you will damage the motor. That's the current drawback for larger well pump motors. You can do that pretty much with any other type of 3 phase industrial motor, just not the submersible well motors.
I hooked up this little 1/2 hp 3 phase motor in my apartment. Pretty much a standard motor that was made in 2007. It's actually running in the pic, and is running off of 240vac single phase. Not an issue ramping the speed from 0-10 Hz over the time frame of 30 seconds. That's a pretty soft start for such a basic motor. Larger motors will do the same. The really fancy ones can play songs!
This is the gizmo that is actually running the motor. The 50.0 on the display is what frequency the motor is currently running at. If I were to run this simple motor in the 0-10 Hz test (which was looped to repeat, over and over) with a Walmart flavored gizmo, that motor probably would have fried within a few minutes.
There is more to this tho. The gizmo running the motor get's it's instructions from another gadget. This other gadget, has far reaching capabilities and can monitor and control thousands of gizmos. There is also a widget, that I can play with from pretty much any place, that can tell the gadget what to do with the gizmos.
My dilemma here, is that the high quality gizmo (not the Walmart type) can easily cradle, with love and respect, the simple 3 phase motor, providing it's not really old. The disclaimers I am seeing, may be that the motor manufacturers automatically assume that you are buying your gizmo from Walmart. I need to get this clarified.
I had to mostly disassemble this. Morph the gadget and widget into a new entity with it's own personality, then surgically implant it on a Roller Coaster to find out what's up! Worked Great! Dwight likes to analyze data. He would probably like the more than 216,000 log's I was sucking off this in a day. Quite a bit of fun!
I know I am not explaining this very well. It's been a pretty crappy week.
I'll have better info later. This is the only example I have with pics.
Next week, I have to get the Chinese and Germans communicating. Funny thing tho, is the China stuff was built in Chicago. You say What!!!
