Motor Testing with Different Hz
Motor Testing with Different Hz
(OP)
We are building an 80V 3 phase squirrel cage motor to operate at 79 Hz. Our problem comes when testing the motor, we have no power source to test it at the rated speed. If I keep a constant V/Hz ratio and run it at 60 Hz, do I use the torque at the test points and convert the recorded Hp to the Hp the motor will generate at speed? What other issues can I run into doing this. Of course, if someone has a better method, I would be glad to hear it.





RE: Motor Testing with Different Hz
Bill
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"Why not the best?"
Jimmy Carter
RE: Motor Testing with Different Hz
I believe the corrections are fairly straightforward at low slip, but very dubious at high slip where deep bar effect kicks in.
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(2B)+(2B)' ?
RE: Motor Testing with Different Hz
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(2B)+(2B)' ?
RE: Motor Testing with Different Hz
RE: Motor Testing with Different Hz
waross: I wish, but this is a special on off motor that we are not expecting to duplicate.
TheBlacksmith: The heating concern of the higher frequency was addressed during the design phase and the testing will just be a short dyno performance to make the motor is operating as expected.
electricpete: The customer will accept any calculations required due to equipment limitations. Loss calculations is something I expected to cause problem. What would you consider as high slip as we are only expecting about 5-6% slip?
RE: Motor Testing with Different Hz