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LarsK
What is the advantage of using a brushless DC motor instead of a stepper? Is it a cost reduction aim that you are looking for? Or is it size?
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The point here is to "close the loop" i.e. to get positional feedback. Besides that, BLDC's are available in all sizes and power ratings imaginable from thousands of manufacturers at rock-bottom prices, they can be built to pretty tough specifications, and the technology is totally mature (but all that also applies to steppers).