Startup error for 12-pole BLDC motor using STM8-MCKIT

[alevinthal]

Posted on March 23, 2010 at 17:27

Startup error for 12-pole BLDC motor using STM8-MCKIT

[alevinthal]

Posted on May 17, 2011 at 10:20

 I have read App note AN1276 and the issue does appears to be in the alignment ramp and startup ramp table. How can I compute the correct parameter/table values for these functions? What other parameters must I set to get the system working?

[Gigi]

Posted on May 17, 2011 at 10:20

Hello,

if you have Startup fail error it means that the required numbers of valid BEMF zero crossing detection have not been occurred.

I suspect that you have to change the ramp-up acceleration to achieve the right control. To do this the best way is to use the STM8 MC Builder available at the following link

http://www.st.com/stonline/products/support/micro/files/stm8smcbuilder.zip

Another trivial issue: if the

motor

have 12 poles this means 6 poles pairs?

Ciao

Gigi