One characteristic of DC brushless is the cogging at very low speeds (resembling a stepper) because of the construction and nature of switching, you would have to go to true AC servo's to get the comparable or better low speed performance. If you require very low speed operation with a BLDC it is best to use some form of reduction. Because BLDC and true AC servos have low armature mass and no brushes, higher speed and high acceleration are the recognized plusses.
Al
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CNC, Mechatronics Integration and Machine Design.
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E. |