motor phase voltage feedback
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Hi guys, I'm working on an EV motor control project, the motor type is IPMSM, and on it’s Drive, I have found that it measures the motor voltage feedbacks (middle point of inverter legs) by Op-amps (inverting Configuration) -> MCU input.
The inverter is two-level, so we have a PWM-type waveform.
The control system uses these measurements directly on its algorithm; switching got disturbed after cutting one of the op-amps inputs off. And motor stops.
My question is that what is the application of those measurements? Does anyone have a similar experience? Industrial Drives doesn’t include this section; so, I think it’s specifically for EV traction applications.
This Drive uses a single shunt current sensing method + Hall position sensor for closed loop.
The circuit schematics and output waveforms are attached.