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I'm wondering are there any motor/drive manufacturer engineers out there? Is this a concern for you?

Everyone, thanks for the input. This is really fascinating stuff. Epete, Please explain why you say this phenomenon only exists in synchonous machines. It may be my misunderstanding of how they work. I will go do some study. Don't VFD's have the potential to make torque pulses? Isn't the ouput...

Epete, Don't your equations assume there is only one spring to begin with? Where is the term for the force which accounts for nonlinear response in magnetic force due to varying the distance between poles in the rotor and stator? I do agree that the effects of resistance and inductance in the...

Thanks for the input so far. I may not be using the correct lingo since I'm a mechanical guy. Let me describe it a little better. At an instant in time, in the stator of a 4-pole motor there are 2 North poles and 2 South poles right? Simultaneously, on the rotor there are also 2 Norths and 2...

Has anyone got information on Electro-mechanical resonance? I have seen some info about this with servo motors but this concerns a standard AC induction motor. I think that if this resonant frequency coincided with VFD firing frequency or a integer multiple it could cause severe torsional...

Maybe you could add a piston and tiny orifice. The piston could made by extending the shaft and adding an o-ring.

I like a hydraulic motor in bad environments. You get strong starting torque and easy to regulate speed. additional benefits are reversibility, small footprint at the point of application, braking capability. Air is incredibly expensive to operate continuously.

One of the causes of excessive noise is the response of the structure to exciting forces created at the interface of the bearing with the shaft carrier.It may not be the bearings. Are you using a precision solid shaft? The shaft should be made to a max roughness of 0.3 micrometers Ra. Also wear...