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[bldg-sim] motor efficiency vs. VFD speed

Alec,
 
There are a couple of curves in the 2001 E-source electronic encyclopedia (probably more recent versions as well).  They show vfd & motor efficiency vs. speed for a vfd-fan-motor system.
 
 
Regards,
 

Galen Staengl, P.E.

Staengl Engineering

129 Goodman St.

Charlottesville, VA  22902
(434)295-8105 (phone/fax)

(434)242-5859 (cell)

-----Original Message-----
From: postman@xxxxxxxx [mailto:postman@xxxxxxxx]On Behalf Of Alec Stevens
Sent: Monday, August 18, 2003 11:14 AM
To: bldg-sim@xxxxxxxx
Subject: [bldg-sim] motor efficiency vs. VFD speed

Hello,
 
Does anyone know of published research that relates motor efficiency to percent load as well as drive frequency?
We have motor curves for efficiency vs. percent load, but these curves all assume a nominal speed that is being maintained as load decreases.  What happens to your motor efficiency when you are also changing the drive frequency?
 
Thanks for any leads.
Sincerely,
 
Alec Stevens, PE
DMI
450 Lexington St, Newton, MA 02466
p: 617-527-1525 x105  f: 617-527-6606
e: astevens@xxxxxxxxxx

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