really interesting doc.
Just a question: at pag 52 of the doc you wrote:
3-phase back EMF voltage
as an ADC features for FRDM-LVPMSM card. But if you take a look at the electric diagram you see that there are only the Current feedbacks, no feedback for the Back-EMF.
Is there some mistakes in the electric diagram? Or maybe you mean Back-EMF feedback as a Leg Current Feedback.
This topic is important for me because in the HVP-MC3 board there is written that there is either the LEG CURRENT FEEDBACK either the BACK-EMF feedback.
So, for the right working of the FOC is it necessary to have the feedback also of the BACK-EMF?
Thanks for explaining
my understanding is that the feedback for the control loop is commonly referred to as Back EMF.
The back EMF signal in an FOC loop is the current converted to voltage in the phases of the motor.
The back EMF signal in a sensorless BLDC is a voltage input to the control loop, not a current.
This difference is effected in the actual hardware, where a PMSM loop measure the current in the motor phase by adding a shunt resistor and the back EMF voltage is measured in a non-active phase of the motor winding. The HVP platform can work with either the bldc sensorless or FOC modes depending on the choice of feedback input you choose.
I hope this helps.
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