A quick update on my PCB Motor prototype:
- Dimensions - 16x17x5mm (excluding the shaft)
- Weight - 1.6grams
- PCB Stator - 6 Poles connected in a delta configuration, with 40 turns each with 4/4mil traces.
- 3D Printed Rotor - 4 Poles
- Bearings - Stainless Steel
- Phase Resistance - 19.3 ohms
- Power Rating - 1W
- Maximum Temperature - 70°C (at 5V)
- Maximum Torque - 0.9 g.cm
Improvements that I'm planning to test:
- Increase the winding's magnetic field strength by reducing the PCB thickness
- Use ceramic instead of stainless steel bearings to reduce friction
- Experiment with different trace winding's clearance and thickness. Increasing it to 5/5mil from 4/4mil will reduce the pcb's cost at low volumes. However, this would also enlarge the motor's diameter to reach same parameter's of the 40turn 4/4mil coil.