PMSM3_4 motor controller development

Kim Jensen73

Hello,

I have appended a Hall-sensor on each phase (U,V,W) on own custom hardware running the pmsm3_4 sample.

This makes it needed to make changes in the f281xileg_vdc driver module so that when the F281X_ileg2_dcbus_drv_read() function is called in the 30Khz motor loop one gets correct values for Ia and Ib. However no matter where in the code I look or what documentation I look in this is discussed as PU units, where I believe at App level I need Amps for Ia and Ib. Can any one advice where to get smart on this and also what to change when calling the F281X_ileg2_dcbus_drv_init() function ?

I can see that there are Gain and offset values for Ia and Ib but not sure how to use that to be able to translate the ADC values from my hall sensores into something use able at APP level (30 KHz motor loop).

I'm using the CSA-1VG-SO to measure the motor phase current on U,V,W.

Description of CSA-1VG-SO can be found here for whom might be interested:

Please advice!

Best Regards,

Kim Jensen.

over 10 years ago

0 Ramesh Ramamoorthy over 10 years ago

TI__Mastermind 27240 points

I recommend you to refer to the control suite projects, because that is where the latest updates can be found. It may be different than what you may have seen.

However, to answer your query on representing current value, if you multiply the pu value with BASE CURRENT value, then you get the actual current value.

0 Kim Jensen73 over 10 years ago in reply to Ramesh Ramamoorthy

Prodigy 240 points

Hi,

thanks a lot for the answer. I'm new to the "TI world"....

When you say BASE CURRENT is there a file where it should be defined in as I can not find it in the source code under that term ?

Also when you mention control suite projects I get scared as it makes me think I have done a lot of efforts porting code from CCS V3.x to CCS V6.x for no reason and things has been made easier...Could you perhaps give me a link to something specific I can look at ?

Thanks for your help and feedback.

Best Regards

Kim.

0 Ramesh Ramamoorthy over 10 years ago in reply to Kim Jensen73

TI__Mastermind 27240 points

I am not too familiar either with that code as it was done in 2005-6. We have clubbed all motor control and power conversion projects into control suite and keep releasing updates and newer projects as and when it happens.

You may not find it too difficult to work with control suite projects.

If you wish to use the one that you are already familiar with, it is fine too. If you don't find any reference to BASE CURRENT, then you can find create one based on your custom boards maximum current sense capability, which is the one that generates max input voltage for ADC.

rgds,
ramesh

0 Kim Jensen73 over 10 years ago in reply to Ramesh Ramamoorthy

Prodigy 240 points

Thanks for the fast reply.
I might be very interested in moving on to use a control suite instead. Could you advice me a www link to look ?

Best Regards,
Kim Jensen

0 Ramesh Ramamoorthy over 10 years ago in reply to Kim Jensen73

TI__Mastermind 27240 points

Kim,

Here is the link: www.ti.com/.../controlsuite

Hope you find it useful.

rgds,
ramesh

0 Kim Jensen73 over 10 years ago in reply to Ramesh Ramamoorthy

Prodigy 240 points

Ramesh,
thanks I needed to look at a similar example in the Control Suite. However, the example there is similar to what I have but for another processor.
The control suite example had some explaining documentation that made me understand what I need to get what I have working..
Than you very much for the help.

Best Regards,
Kim

0 Ramesh Ramamoorthy over 10 years ago in reply to Kim Jensen73

TI__Mastermind 27240 points

You are welcome !!

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PMSM3_4 motor controller development