An1017A application note microchip

[electronicsLearner77]

The AN1017A application note is the sinusoidal control of BLDC motors. I am implementing it but i have few questions. The source code provided for that refers to two terms phaseoffsetCW and phaseoffsetCCW. I am confused with this. The document says this is added for symmetry of sine wave can someone please explain me this?

 

[kellys_eye]

Looks like you have to adjust the phase of the driving waveform to maintain maximum current flow in the windings as the speed increases (lag caused by inductive loading) - this is the offset value (in clockwise and counterclockwise directions).

 

[electronicsLearner77]

Thank you for the reply. Is it possible to give some detailed explanation or any link explaining this. Please advise.

 

[Harald Kapp]

Read the part about phase angle advance here. That is what I think you are looking for.

 

[electronicsLearner77]

Theoritically it feels ok but when i am implementing the application note facing difficulties.