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kcl
kcl
Associate
July 22, 2005
Question

BLDC motor control in sensor mode

  • July 22, 2005
  • 5 replies
  • 1046 views
Posted on July 22, 2005 at 05:59

BLDC motor control in sensor mode

This topic has been closed for replies.

5 replies

kcl
kclAuthor
Associate
May 17, 2011
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??

luter
luter
Associate III
May 17, 2011
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.

maxime2399
maxime2399
Associate III
May 17, 2011
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.
maxime2399
maxime2399
Associate III
May 17, 2011
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.
kcl
kclAuthor
Associate
May 17, 2011
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?
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