TMS320F28027F: What are the coefficients of the CLARKE transformation?

Luo XiuFeng

I found the CLARKE transform coefficient setting functions CTRL_setupClarke_I and CTRL_setupClarke_V in lab5b. In the function, it sets alpha_sf to 1/3 and beta_sf to 1/sqrt(3). What I want to ask is that these two are not equal power or equal amplitude transform coefficients. What does this coefficient represent? Are there relevant pdfs available for viewing?

over 4 years ago

+1 Navaneeth Narayanasamy over 4 years ago

TI__Intellectual 2910 points

Hello Luo,

The amplitude invariant of Clarke transformation would provide us Ialpha = 2/3 (Ia-0.5Ib-0.5Ic) and Ibeta = 2/3 (sqrt(3)/2 * ib - sqrt(3)/2 *ic). we can simply rearrange this to Ialpha = 1/3 (2*Ia-Ib-Ic) and Ibeta = 1/sqrt(3)* ( ib - ic). This is were alpha_sf to 1/3 and beta_sf to 1/sqrt(3) comes into picture. Hope this clarifies.

0 Luo XiuFeng over 4 years ago in reply to Navaneeth Narayanasamy

Intellectual 676 points

I would like to ask you how to calculate the motor output power in real time in lab5b

+1 Navaneeth Narayanasamy over 4 years ago in reply to Luo XiuFeng

TI__Intellectual 2910 points

try leveraging EST_getSpeed_krpm and USER_computeTorque_Nm functions to calculate output motor power.

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TMS320F28027F: What are the coefficients of the CLARKE transformation?