Interfacing Absolute position encoder with DRV8312-69M-KIT RevD

Behnam Eskandariun

Other Parts Discussed in Thread: CONTROLSUITE

Hi,

I'm trying to replace incremental rotary encoder with Absolute one in Lab12a. There are some problems that I'm facing wth.

1- Is it possible to connect 10-bit encoder digital output to the J5 on the DRV8312-69M Kit? (I couldn't find the schematic for DRV8312-69M Kit.)

2- If yes how I can convert the mechanical position to the electrical angle?

3- And finally how I can use the calculated electrical angle as input for FOC and SpinTAC module?

I read all previous related posts about replacing the incremental encoder with other types, but there are some confusing things for me about the mechanical angle, and electrical angle, how to disable QEP and use the position sensor value instead and is there enough GPIO to interface 10-bit parallel input.

I would appreciate any help.

Thank you,

over 9 years ago

0 ChrisClearman over 9 years ago

TI__Guru** 119680 points

1. I would think so yes C:\ti\controlSUITE\development_kits\DRV8312-C2-KIT_v128\~DRV8312EVM-HWdevPkg
2. that is discussed and handled by one of the SpinTAC components, position converter
3. that is also explained in proj_lab12

0 Behnam Eskandariun over 9 years ago in reply to ChrisClearman

Prodigy 40 points

Chris,

Thanks for the reply.
The other question is it possible to limit the torque level in the position control procedure?
The goal is to adjust the shaft position in the particular angle and lock it at zero speed with adjustable torque. IS it possible and how?

0 Adam D. Reynolds over 9 years ago

Guru 12800 points

Behnam,

2. Look at the files where we calculate the electrical angle for the quadratuer encoder, ENC_calcElecAngle. It has comments that should help with the calculations.

3. Look for the functions where the function ENC_getElecAngle is used.

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Interfacing Absolute position encoder with DRV8312-69M-KIT RevD