No feasible current reference found on PMSM Current reference Generator
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adhavan d
am 22 Jun. 2023
Kommentiert: Raghunath Rachabattuni
am 30 Jun. 2023
Hi,In my model,When I apply [ 1000 2000 3000 ] these speed,The results PMSM Current reference generator works.But When I have set Speed value in Rpm on PMSM Current reference generator. [ 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 ] and Torque in Nm [ 0.48 0.53 0.60 0.68 0.79 0.95 1.19 1.59 2.38 4.76 ] and Voltage in Volt [ 36 40 48 52 ] in Automatically generated lookup table.It shows no feasible current reference found.For 3000 rpm & 1.5 Nm ,It takes -1.5 A id and 30 Iq Amp.
My Question is is PMSM Current reference generator block working in Field Weakening mode for IPMSM.
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Sabin
am 22 Jun. 2023
The PMSM Current Reference Generator block is implementing equations for both MTPA and FW. However, this approach may not always provide a solution. The equations for the two modes are given in the documentation page:
When no feasible solution can be found it usually means that the algorithm was not able to find a pair of currents (id,iq) that would satisfy the voltage constraint for the given parameters. Sometimes increasing the nominal voltage will help. Depending on the machine under test, the constant parameters Ld, Lq, psim might make it impossible to find a solution. In a real system machine parameters will have some variations related to magnetic saturation and other phenomena (at different d-q currents will have different parameters).
I hope this helps.
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Raghunath Rachabattuni
am 30 Jun. 2023
Hi Aditya, the units for wm input port of the block are rad/s (mechanical). Thanks for pointing out the doc typo, it will be corrected soon.
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