Flux weakening equation issue

i have modelled using subsystem block for flux weakening equation(IPMSM) which is available in mathworks website.but output of id,iq is not match with motor cad id iq.

Notes:8500 rpm 15 Nm

did i model properly?

Answer 1

[Sabin]

First, the equations are implemented based on constant parameters, basically ignoring some physical phenomena that motor cad may include. Second, I would check if the definition for axis transformation is the same in the equations you are implementing and in motor cad. It is not uncommon for FEM tools to use a different definition that what a control engineer would use. The are 4 possible definitions:

• Q leads D, rotor angle measured from A-phase to D-axis
• Q leads D, rotor angle measured from A-phase to Q-axis
• D leads Q, rotor angle measured from A-phase to D-axis
• D leads Q, rotor angle measured from A-phase to Q-axis

More about the axis definition you can find in the FEM-Parameterized PMSM doc page:

https://www.mathworks.com/help/sps/ref/femparameterizedpmsm.html#mw_e80610e3-7437-41a2-8194-6919dbe12eef