PGA411-Q1: Problem reading angles and velocities from a 3-pole resolver

Anthony Robertson54

Part Number: PGA411-Q1

Hi!

I am trying to interface a PGA411-Q1 to a 3-pole resolver via the PGA411-Q1 EVM development board.

The problem is, that whatever values I set in the DEV_CONFIG1 / NPLE register, I always read a velocity that is three times too high, and when I move the resolver through 360°, I get three cycles of 0-359°, instead of just one.

Why is the PGA411 seemingly ignoring the NPLE register?

Best Regards

Anthony Robertson.

over 7 years ago

0 Clancy Soehren over 7 years ago

TI__Mastermind 23810 points

Anthony,

The NPLE register only affects the commutation encoder outputs (OUTU, OUTV, OUW, etc.). Also, it acts as a pole multiplier, not as a corrector for using a multi-pole resolver.

This is expected behavior, so you will need to account for it in your software. Please let me know if you have any other questions.

Thanks,

-Clancy

0 Anthony Robertson54 over 7 years ago in reply to Clancy Soehren

Prodigy 20 points

Thanks Clancy, that answered my question. :-)

Best Regards
Anthony

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PGA411-Q1: Problem reading angles and velocities from a 3-pole resolver