Hi there,
I am hoping someone could shed some light on my project i have going on for a motor controller.
So far i have tested a few example circuits using the tl494 pwm chip and tweaked the circuit slightly.
The problem i am having is motor stability in terms of constant speed. Its not as stable as i would like and keeps dipping or rev'ing a little when i set the speed using a pot on the dead time control.
I have tested with a different frequencies ranging from 200Hz-20Khz to see if this would help the stuttering of the motor but still no joy.
I would imagine i need some form of compensation or something but i am not sure how to apply this.
See schematic for what i have so far.
I do also have UC3637 & UC3678 motor controllers from TI but these not a great deal of info on how to use them either.
I am hoping someone could shed some light on my project i have going on for a motor controller.
So far i have tested a few example circuits using the tl494 pwm chip and tweaked the circuit slightly.
The problem i am having is motor stability in terms of constant speed. Its not as stable as i would like and keeps dipping or rev'ing a little when i set the speed using a pot on the dead time control.
I have tested with a different frequencies ranging from 200Hz-20Khz to see if this would help the stuttering of the motor but still no joy.
I would imagine i need some form of compensation or something but i am not sure how to apply this.
See schematic for what i have so far.
I do also have UC3637 & UC3678 motor controllers from TI but these not a great deal of info on how to use them either.
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