Motor Perfomance Measurement
Motor Perfomance Measurement
(OP)
I am looking for an economical way to measure the performance of small DC electric motors (speed 400). Any thoughts short of buying a dynamometer?
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Motor Perfomance Measurement
|
RE: Motor Perfomance Measurement
1) make a dynamometer. It isn't hard to build a force balance, and once you've done that everything else is easy
or
2) add a balanced rotor of known inertia and do a dynamic spin-up test
3) drive a known generator from your unknown motor. There may even be some handy reciprocity laws about using two identical motors as a motor-generator set.
4) ask the manufacturer!
Cheers
Greg Locock
RE: Motor Perfomance Measurement
RE: Motor Perfomance Measurement
To measure torque, build a device that cradle-mounts your motor/prop with a ruler mounted on it. A known weight is arranged so it can slide along the ruler. Before powering up, the cradle/motor/ruler should be perfectly balanced. Then run the motor. Slide the weight until the rig is again perfectly balanced. Read moment arm from the ruler. Multiply by the weight to get torque. Read rpm. Multiply by torque to get power.