PMLSM Torque Constant from Test Data
Hi All,
Quick question regarding deriving PM flux linkage [Wb] from a torque constant estimated from data on a PMLSM.
I have an estimated torque constant Kt [N/A], which is from experimental test data. I will now parameterising my Simscape PMLSM block from this torque constant.
The literature seems confusing, to derive PM flux linkage [Wb] from the experimental torque contant do i include the (3/2) constant. Some examples include the constant and some omit, which one of the following is preferred for deriving the PM flux linkage?
Thanks
Patrick
3 Comments
Time Descending
For abc->dq transformation, If you use power-invariant transformation (park-orthonormal transformation) for calculating Vd, Vq, Id, Iq from Vabc, Iabc, torque equation not involve 3/2 factor. In such case, Kt and permanent flux linkage conversion not includes 3/2 multiplication factor.
For abc->dq transformation, If amplitude invariant transformation (abc->dq) is used, torque equation include a multiplication factor 3/2. Refer this documentation page for more details, https://www.mathworks.com/help/mcb/ref/surfacemountpmsm.html
Hi Ananth,
OK, interesting, so using the 3/2 coefficient in Kt to derive flux linkage is solely based on what abc to dq0 is used in the model?
I use the standard amplitude invariant transformation (dq0), as below.
To confirm I use Kt = (3/2)*Np*PM to derive PM flux linkage?
Thanks again.
I made some quick browsing to find the equations of power invariant transformations. Please do check the below equations. I guess this will help you.
