ELI5: Why aren’t Brushless DC BLDC motors just AC

r/

Ok so the first question- My understanding (which is not comprehensive or even particularly good) is that a BLDC motor takes DC and converts it to AC, why not just start with AC? Or does it start with DC strictly for the sake of using a battery?

Now the reason/follow up question- Can you take a battery operated BLDC tool and switch it to corded with relative ease and cheaply? Basically, I am looking at my Ego backpack blower and while I like the convenience it provides, I hate the low run time. My 12 year old brain (I figure that’s about the level of understanding and skill I have when it comes to electricity) is wondering why can’t we just add a cord? Thanks for any insights.

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