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q- d- currents of PMSM drive in Delta configuration

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Tom Lankhorst
Tom Lankhorst 2020 年 7 月 31 日
コメント済み: Mohsen Aleenejad 2020 年 7 月 31 日
I measure the line-currents of a Delta-wired 3 phase PMSM (SimScape).
Then, I apply the Park transform to transform abc to dq0.
Now, the output of the Park transform is different from the d- and q- currents that I see in the SimScape result explorer.
When I switch to Wye-configuration. The values are as expected, but the torque is higher than what I would expect from torque = K_t * i_q.
Notice how the idq0Scope (after Park transform) gives different values. (d/q; 10/0 vs 5/-2.887A)
Can anyone explain this difference?
Current controller:

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Mohsen Aleenejad
Mohsen Aleenejad 2020 年 7 月 31 日
Hi Tom,
Could you please tell me if these numbers are the exact values you observe? If not could you please provide the exact values?
Thank you
Mohsen
  5 件のコメント
Tom Lankhorst
Tom Lankhorst 2020 年 7 月 31 日
Thanks for your insight Mohsen.
I scaled the 'measured' current by 1/sqrt(3) then subtracted pi/6 from theta... and it works.
Only the output torque is exactly 1.5 times as high as I would expect from the torque constant.
Mohsen Aleenejad
Mohsen Aleenejad 2020 年 7 月 31 日
I'm happy that could help. Regarding the torque, if I recall correctly, there is a 2/3 constant in the equation, probabley the difference is coming from there and you need to consider it somewhere.

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