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Single Back-EMF sensoring.

Tony Philipsson
Guru 12050 points

Other Parts Discussed in Thread: DRV8312

3 phase brushless motor control.

As the MCU will know what windings it have engaged and
with some simple math could calculate an average speed per
rotation and therefore know when to turn on the other  2 phases.

To save the number of MCU i/o pins used I could see the need
to only use one EMF sensor.

Any problems with this?
Any simple solution, as the schematic in drv8312 page29
is cluttered to figure out what to remove.

This should work?

  • 0
    Intellectual 720 points

    Hello Tony,

    1, I am not very sure, that your measuring EMF just on one phase would work perfectly or even work.

    2, "as the schematic in drv8312 page29", there I can find nothing helpful/useful.

    3, For the circuit, I would connect divided +DC_BUS to "+" of the comparator and the value of the divider resistors, I think, could be smaller.

    4, A serial resistor at each input of the comparator may be necessary.  

    5, Taking care of the value of the feedback resistor and the two serial resistors in order to scaling the output voltage.

    So far, that is what I can say.

    Regards,

    Long