×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

dynamometric testing for AC& DC electric motors

dynamometric testing for AC& DC electric motors

dynamometric testing for AC& DC electric motors

(OP)
Hello Friends,

I am interesting in to know about the different and recommended Dynamomtric test availables for AC and DC electric motors.

Thanks for the Inputs.

Regards

Petronila

RE: dynamometric testing for AC& DC electric motors

Hi Petronila,

Dynamometric testing is different for a large variety of motors. One can also get many types of dynomometers such as hydraulic, electro-magnetic, frictional.

Please be more specific about the type of motor, its mountings, the type of cooling the motor usually needs and what you are hoping to achieve with the tests. Some people such as rewinders need to prove efficiency, others want to prove the load handling capability or over load conditions.

Regards

RE: dynamometric testing for AC& DC electric motors

The dynamometer based load simulation system for electric motors from well known manufacturers as Magtrol, Huco and Himmelstein, are very expensive. The thermal model based method of motor SOA testing maybe suggested. This method was designed by R.H.Welch Jr., well known motor designed and expert.

RE: dynamometric testing for AC& DC electric motors

(OP)
Thanks for the Inputs,

Specific needs are for prove efficiency at some loading conditions in a motor repair shop

Regards

Petronila

RE: dynamometric testing for AC& DC electric motors

Most of the one's I have seen in motor shops have been self made versions, essentially a system of coupling the motor to be tested to another motor that either regenerates into a load bank (i.e. resistor bank, water brakes, eddy current clutch), or has another VS drive system running it such as a 4 quadrant DC drive or AC Flux Vector drive. If you want verifiable test data, I would probably go buy something already made, you could get lost in the details of instrumentation, data recording and extraction. Most of the dynamometer systems come with all that (and a bag of chips). This company makes all the various parts individually so that you can pick and choose which ones you want to do yourself. I used them once just for the instrumentation package on an engine test stand where I did the VFD and mechanical coupling parts, it made it very easy. If I had to do it again I probably would use their mechanical mounting system too, that was a lot of work to get it right.

http://www.taylordyno.com/elec/elec.html

JRaef.com
"Engineers like to solve problems.  If there are no problems handily available, they will create their own problems."   Scott Adams  
For the best use of Eng-Tips, please click here -> FAQ731-376

RE: dynamometric testing for AC& DC electric motors

Petronila,

you wrote "Specific needs are for prove efficiency at some loading conditions in a motor repair shop". As you probably know there different standards for determination of efficiency mainly as IEC or IEEE, so should you follow these ones or simply the efficiency "input/output"?

If IEC 60034-2 should be followed, that is the simpliest one. IEEE 112 Method B requires more.

RE: dynamometric testing for AC& DC electric motors

I tested a Fanuc spindle drive with a piston hydraulic pump, gear flow meter, pressure transducer and relief valve to find a wide torque variation over a 100 rpm range. There are torque measuring devices that would provide an even better range of rpm and accuracy.

RE: dynamometric testing for AC& DC electric motors

The size of the motors that you will test define the dynamometer type and investment.
Remember that the first requirement is the electric power supply capacity. See http://www.magtrol.com/motortesting/dynamometers.htm for some information.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources