BLDC motor control in sensor mode

kcl · ‎2005-07-21

Posted on July 22, 2005 at 05:59

kcl · ‎2011-05-17

Posted on May 17, 2011 at 10:16

Can anyone help me find some kind of info/app.notes on how to control a BLDC motor with the ST72141K2 in sensor mode (Hall sensors) everyone talks about the MCU beeing able to handle this, but no one seems to tell how...! I have the Kanda Kit ST7MTC2, I got the motor running with a load, but it doesn't have any torque....Any ideas??

kcl · ‎2011-05-17

Posted on May 17, 2011 at 10:16

Thanks, I gathered that it had to do with the current being too small...!

But I don't think the AN1321 is very explanatory, do you know of some document describing the sensor mode feature better..?

About the delay coefficient... I read somewhere that it had to be 0/32 because of the sensor mode. It tells the exact rotor position at all times..! What do you think?

maxime2399 · ‎2011-05-17

Posted on May 17, 2011 at 10:16

The application note 1321 explain how to drive the motor in sensor mode. You will need to do some modifications in the code and on the board.

http://www.stmcu.com/devicedocs-ST72141K2-15.html

Regarding the low torque, you have either a current that is to low or a phase shift not appropriate.

If you current is too low: increase it.

if your phase shift is not appropriate change your delay coefficient.

maxime2399 · ‎2011-05-17

Posted on May 17, 2011 at 10:16

I think you are right, in sensor mode the delay coefficient need to be 0/32.

The AN1321 is the only one I know on the subject. It need to be read together with the code generated by the Kanda kit software: the kanda kit contains the code for sensorless.

luter · ‎2011-05-17

Posted on May 17, 2011 at 10:16

hello. i am starting with sensor control and realized a lack of documentation. if u already have someting, could u share it? Tnx.