low speed BLDC motor

info51 · ‎2005-10-28

Posted on October 28, 2005 at 09:24

info51 · ‎2011-05-17

Posted on May 17, 2011 at 10:19

Hello,

I need to set my ST72141 software controller for 8 poles (4 pair) BLDC motor for a very low speed (150,250,500 rpm), and I have no problem with voltage open loop, but actually is not possible for me get speeds lower than 800/1000rpm in voltage closed loop.

Have you some suggestion about?

thank

Claudio

jean-marie · ‎2011-05-17

Posted on May 17, 2011 at 10:19

Hello,

In closed loop the PI loop make a test with a minimum duty cycle.

It could be that the minimum value set in your program do not allow to run the motor at lower speed than 800/1000rpm.

You have to change this value to be compatible with your request.