PWM for stepper motor

feres_cherif · ‎2013-03-21

Posted on March 21, 2013 at 23:29

hi all,

please i need help. I have to generate 2 signals PWM like this:

I think that we should insert a dead time. How to do it plz?

Tesla DeLorean · ‎2013-03-21

Posted on March 22, 2013 at 00:14

Set up two timers, with 50/50 duty, and frequency you want. Program the 90 degree phase difference via the CNT register of one timer with respect to the other.

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feres_cherif · ‎2013-03-22

Posted on March 22, 2013 at 11:07

Thx Clive, i'll try it

feres_cherif · ‎2013-03-22

Posted on March 22, 2013 at 12:50

Hi Clive, please can you help me ? what is the value of this register (cnt)

Tesla DeLorean · ‎2013-03-22

Posted on March 22, 2013 at 14:25

If

TIM_TimeBaseStructure.TIM_Period = 300 - 1;

For Duty

TIM_OCInitStructure.TIM_Pulse = 300 / 2; // 50% for duty

For Phase

Delta in CNT for one timer vs other will be 75, ie 300 / 4 for 25% or 90 degree phase shift

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