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what is HFI in the VESC?

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dcameron
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what is HFI in the VESC?

Confused what HFI stands for.  Is this a different form of the FOC or an open-loop function for tuning?

frank
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High Frequency Injection, a method to determine the rotor position without sensors at low RPM.

dcameron
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Yes, very cool.  I found what i was looking for on the you tube videos.  Pretty amazing results.  Does the software automatically switch between HFI and flux observer/estimation tracking?  Does HFI V07 always use D-axis excitation for zero, low, and high RPM?