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Alternator vibration had every order, what could be wrong?

Creator
Creator

Analized two noisy claw pole alternators. There were basically even strength orders as shown in the plots. Are this typical? I had hard time relate those to any commen causes (unbalance, bent shaft, bearing frequencies, 5 windows on the case, 6 poles,  36th order elelctrical torque variations, ....).  

Any one has seen those before and have some advice?

 

Thanks!

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Re: Alternator vibration had every order, what could be wrong?

Creator
Creator

Attached is another plot.