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Originally Posted by zeropointbug
It also says a brushless DC motor has square back EMF waves, how can that be? It's a natural movement and a natural wave would follow.
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lol, it seems I was having this exact discussion with someone else recently. Actually, I believe the back EMF pulses will be an odd-shaped square wave with a larger pulse on the front end and taper down. You have to remember we are not feeding sine waves to the motor. When using sine waves, the field does not collapse as hard since you aren't totally removing voltage at once. You're probably thinking of variable frequency drives?