I died of simple infection while building the kiln. No antibiotics.

You can use chemical batteries to create electric current without magnets.

You can also create weak permanent magnets by just hitting iron with a hammer.

So you have any idea how hard it is to make wire consistent enough to make the windings? There's a reason that wire wasn't really a thing until the 1700s at the earliest.

The wire part of that isn't trivial. They were pulling wires in the middle ages for holding armor together, but high volume and specialization didn't come until the Renaissance. Good insulation pretty much requires plastics. Wax could be used before that but it's not as good. Your early motors will have shorts that reduce power or kill it entirely.

You forgot the water. You need water to boil.