Quote:
Originally Posted by takyka
Hi,
The use of 3phase AC motors is a small step towards higher efficiency.
One problem, if you run a motor with VFD on 100% it is less efficient than the single phase counterpart. This is due the losses of the VFD.
Other issue is, BLDC motors are more effective. :-)
For circulation pump it's easy you can't beat (in price, simplicity and efficiency) the off the shelf units like Grundfos Alpha2
http://net.grundfos.com/Appl/WebCAPS...re-4352964.pdf
You can get 1/2-1/3 electric consumption from it than a single phase ac pump.
Biger problem to get BLDC (non circulation)pump, compressor and fan motor. I don't know if those are available as standard products...
VFDs are available from as small as 100W. I run my well pump from a 400W VFD on 23Hz, for passive cooling purposes.
http://ecorenovator.org/forum/attach...pfirsttest-jpg rightmost device in electrical box.
T. |
Thanks, great information!!
Where do you get the small VFD?
-AC