Other Parts Discussed in Thread: DRV8316
Hi All,
I'm working on driving sensorless BLDC motor by 120 degrees trapezoidal control.
I'm stuck on to get back-emf voltage like below figure:
My result is like this.
And the circuit used for voltage sens part is as follow.
I am using the circuit of DRV8216REVM with some modification. Remove the capacitor, and add 75kΩ for generate a virtual neutral point .
I don't know if it's a circuit problem or a control firmware problem.
Please suggest how to get trapezoidal back-emf waveform.