[bldg-sim] motor efficiency vs. VFD speed

Galen Staengl gstaengl at earthlink.net
Mon Aug 18 09:07:10 PDT 2003


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.


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 at gard.com [mailto:postman at gard.com]On Behalf Of Alec Stevens
  Sent: Monday, August 18, 2003 11:14 AM
  To: bldg-sim at gard.com
  Subject: [bldg-sim] motor efficiency vs. VFD speed


  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

  Thanks for any leads.

  Alec Stevens, PE
  450 Lexington St, Newton, MA 02466
  p: 617-527-1525 x105  f: 617-527-6606
  e: astevens at dmiinc.com

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