oreless DC motors replace a heavy iron rotor core with a self-supporting, hollow-cup winding made of enameled copper wire
| • Design Structure | 2-pole or multi-pole stator with a hollow-cup coreless rotor and neodymium (Nd-Fe-B) permanent magnets. |
| • Commutation | Precious metal or copper-graphite brushes. |
| • Operating Voltage Range | 1.3V to 12V+ (commonly 3.4V – 3.7V for micro/drone variants, up to 12V for industrial/geared units). |
| • Diameter Sizes | Typically ranges from 4 mm to 40 mm (micro sizes like 7 mm, 8 mm, and 10 mm are standard for RC and drones). |
| • No-Load / Rated Speed | 15,000 to 50,000+ RPM (depending on the specific sub-model and voltage). |
| • Efficiency | Up to 59% – 90% depending on the model and presence of a gearbox. |