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“A smaller and cheaper open source brushless motor My open source PCB motor is my attempt to build a smaller, cheaper and easier to assemble micro brushless motor. What unique about this motor design is that the stator is printed on a 4-layer PCB board. The six stator poles are spiral traces wounded in a star configuration. Although these coils produce less torque compared to an iron core stator, the motor is still suitable for high-speed applications. It also has a 16mm diameter, 1.7mm thin 3d printed 4-pole rotor. So the total thickness of this axial flux motor adds up to 5mm (excluding the shaft) and weighs 1.5 grams. The inspiration for this idea came from trying to build smaller and cheaper drone. Making the motor onto the PCB itself will reduce the overall price of any tiny robot, allowing swarm robotics to become more affordable.”

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