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Originally posted by sanddrag
By a system of elimination I have concluded the following:
Your motors worked at 4000Hz. Your motors burnt up at 400Hz. Problem - too low of an operating frequency. Solution - move back to the higher frequency.
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Except that they changed both the frequency AND the voltage. 2 variables changed, so it could be either that's leading to the failures.
However, I would also suspect that the higher frequency is contributing more to the problem than the voltage increase. Unfortunately, it sounds like you were just getting lucky with the motors when using the old parameters, if changing them by such a small amount has such bad consequences. If it were me and I didn't have any more spares left, I wouldn't take any chances and would revert to values that worked before. Ideally that would mean changing both frequency and voltage back to known good values.
Quote:
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Our electrical engineers are hesitant to switch to 4000 hZ because they say performance drops as the PWM frequency increases
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Sounds to me like performance is non-existant with the current settings.
