PGA411-Q1: SIN and COS distorted

RangoTango Rango

Part Number: PGA411-Q1

Is there any registers that can be configured for the AFE, tracking-loop or R2D to help with asymmetrical SIN and COS input signals like the ones shown below please?

It seems due to the changing zero-crossing dc-level of SIN and COS(periodically) on envelope distortion, the AOUT signal from the device implies the angle is always lagging?

over 5 years ago

0 Clancy Soehren over 5 years ago

TI__Mastermind 23810 points

Is this due to noise or is it due to non-idealities in the resolver sensor? If you change the rotation speed, does the asymmetry change?

0 RangoTango Rango over 5 years ago in reply to Clancy Soehren

Prodigy 20 points

The asymmetry is constant across the speed range(same envelope profile), probably due to non-ideal behaviour in resolver

0 Clancy Soehren over 5 years ago in reply to RangoTango Rango

TI__Mastermind 23810 points

Yes, that probably means that the issue is non-ideal resolver behavior. Unfortuately, there is nothing inside the PGA411 that can compensate for that.

Is it possible that there is an issue with the mechanical mounting of the resolver sensor? I don't normally see OCOS/OSIN signals that look so distorted.

I have seen people compensate for some resolver sensor errors in software, but I cannot provide any guidance for how to do that.

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PGA411-Q1: SIN and COS distorted