Rotating imbalance from faulty rotor bar joints
Rotating imbalance from faulty rotor bar joints
(OP)
I have recently had some rotors tested(with a core loss tester) and the results showed some high resistance joints between the rotor bars and the short circuit ring(these are brazed joints). I know that these high resistance joints will cause vibration issues, high current draw, and heating issues. I would like to calculate(or estimate)the amount of force or imbalance that would occur from a high resistance joint in a rotor circuit. Any help would be appreciated.





RE: Rotating imbalance from faulty rotor bar joints
Force = S·W·A·G
Where Force is in units of lbf
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RE: Rotating imbalance from faulty rotor bar joints
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RE: Rotating imbalance from faulty rotor bar joints
JRaef.com
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RE: Rotating imbalance from faulty rotor bar joints
W = Weight of rotor; A = cross sectional area; G = acceleration of gravity (required for English units).
Actually I wasn't trying to be a wise guy in response to the original question. I suspect any attempt at calculating this would be very involved, require many gross assumptions, and be very inaccurate.
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RE: Rotating imbalance from faulty rotor bar joints
Unfortunately, the formula then also needs a term (or terms) that can cancel the extra m*A3/s from the results.