Thread Tools
This thread is privately moderated by yomgui, who may elect to delete unwanted replies.
Old Jun 29, 2011, 11:03 AM
yomgui is offline
Find More Posts by yomgui
Suspended Account
Discussion

Torque test bench for electric motors


This homemade torque test bench gives very good results.

If the drive's resistance and no-load torque are known or well estimated, it allows to modelize a motor's performances with precision, based on amps, volts and rpm measurements.

Calculated values for power at the shaft are close to measured values, with an average error of 0,7% (max error = 3 %, but with the motor being run under bad conditions, with bad efficiency).

In fact, I think I can modelize a motor in a quite better way than only using amps, volts and rpm measurements (with kv thought as constant). BUT, it is very very close to any model taking into account inductance and to me it proves their reliability (thinking about drivecalc).

Well, I think...! I'm not at all a scientist...
Sign up now
to remove ads between posts
Old Oct 09, 2012, 05:32 AM
stealthdragonb is offline
Find More Posts by stealthdragonb
Registered User
Hi, I know this is slightly an old topic but I have been doing very similar tests using a wind tunnel. Could you explain to me how you measured the torque. Did u have a force balance because then you can find prop efficiency using eff=thrust x velocity/ power where power=torque x omega. How does motocalc calculate propeller efficiency as I haven't found torque of the motor anywhere. An eqn would be really helpful. I would really appreciate your help. Thanks!

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Data Motor Data - test bench data for several hundred brushless motors. Dr Kiwi Power Systems 863 Sep 25, 2016 04:04 AM
Discussion Bench Test of APC E-props (11x5 to 15x6), Watts, Torque, Thrust Wise_Man Power Systems 46 Apr 14, 2014 07:46 AM
Build Log Building a Plane...for Free. Bench Test Video & Pics The Hog Pen Electric Warbirds 72 Oct 10, 2011 11:53 PM
Discussion Looking for Fredrik Wergeland - Great Electric Motor Test Ken Myers Power Systems 6 Jul 01, 2011 07:48 AM
For Sale Electric motor bench- test stand nakman8 Aircraft - General - Miscellaneous (FS/W) 0 Jan 17, 2008 03:20 PM