Well,
lets' start with this:
http://www.edn.com/design/sensors/4406682/Brushless-DC-Motors---Part-I--Construction-and-Operating-Principles
Brushless motors use 3-phase commutation. Some commutation is done in a trapezoidal form, but most BLDC motors now use (or approach) sine wave commutation.
The windings can produce flux in either an axial pattern or radial pattern. There is also a newer technology called transverse flux that provides higher torque at very low RPMs.
The commutation scheme (microprocessor-driven) can be sensored with hall effect sensors or can be sensorless (mostly for one direction, one speed applications).
Why would you even want to consider making your own motor? There are entire 3-day conferences dedicated to the math of motor design....It's overwhelming!
Posted by: drhitch54@yahoo.com
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