BLDC sensorless control

Roman

Hi everyone!

Faced with problem to bring motor in synchronous mode to reach best efficienty of my motor.I guess i wrong to write here, but may be someone work on this theme or have some examples how to get it

over 15 years ago

0 Lucifer Angel over 15 years ago

Intellectual 995 points

Hi!

What do You mean?

The thing is that BLDC is principally synchronous.

Regards.

0 Roman over 15 years ago in reply to Lucifer Angel

Intellectual 360 points

i mean to get the best efficiency which is obtained when the 2 signals:current generated by inverter in the motor windings and back-EMF voltage are in phase. In my case back-EMF behind about 90 degree.And there is no way to detect back-EMF crossing zero

0 Lucifer Angel over 15 years ago in reply to Roman

Intellectual 995 points

Roman said:
there is no way to detect back-EMF crossing zero

Current sensing is the way to go.

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BLDC sensorless control