Why do MCM_Park and MCM_Rev_Park use non-standard equation forms?

[Jeffery Scott]

Posted on April 05, 2018 at 22:29

I'm trying to compare the SVPWM code with what we have today, and as a precaution I also looked at the inverse park routine. I noticed that MCM_Rev_Park uses a different form than most others use, and the MCM_Park transform seems to match this. Comments showing a comparison between CMSIS and MCSDK code is shown below.

MCM_Rev_Park:

 Valfa= Vq*Cos(theta)+ Vd*Sin(theta)

 Vbeta=-Vq*Sin(theta)+ Vd*Cos(theta)

arm_math.h:

Id = Ialpha * cosVal + Ibeta * sinVal;

Iq = -Ialpha * sinVal + Ibeta * cosVal;

I'm looking at MCSDK V5.0.

Thanks

[Lee DongWook]

Posted on June 18, 2018 at 11:39

Hello,

I have the same question.

I am looking at MCSDK V4.3.

Clark, Park, RevPark transform is different from the general formula.

MCSDK V4.3 Sourc code.

Clark :

Ialpha : Ia

Ibeta  :  -Ia/3 - 2Ib/3

general formula.

Clark:

Ialpha : Ia

Ibeta  :  Ia/3 + 2Ib/3

I think that the current control is not working properly, and the cause is the non-standard formula.

Let me know when the issue is resolved.

Thank you.

[Laurent Ca...]

The question has been moved from the "Motor Control Hardware" section to the "STM32 Motor Control" section (the question is about the STM32 MC SDK). 

Best regards