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BobLfoot

Powerflex Drives Specifications

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When reading the Specifications for a Powerflex 750 Series Drive it states that in Flux Vector Torque Control Mode the specification is 

+/- 2% 2500 rads/s bandwidth with an encoder 

and

+/- 5% 600 rads/s bandwidth without an encoder

I understand the percent is percent of total base torque.

So if using a 60 n-m motor the 2% is 1.2 n-m or 5% is 3.0 n-m.

I just don't understand what radians per second bandwidth has to modify the situation.
 

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Are you sure that is bandwidth? Looks like a speed rating.  Multiply by 60/2π to get RPMs.

Edited by pturmel

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Hm.  Well, divide by 2π to get Hz.

Can you tell that my Bode-plot-fu is rusty?

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So I also posted this on the Rockwell Drives Forum of rockwellautomation.com and received an answer.

Turns out the bandwidth means response speed of the torque loop.

So 2500 rad/s with 6.28 rad/hz is 398 hz.  and 600 rad/s is 95.54 hz.

So a 120 hz noise signal on the torque value signal would be followed with an encoder, but not without.

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