Why a Planetary Gearmotor? In combat robotics, drive motors are exposed to repeated shock loads, sudden reversals, and side impacts that quickly reveal the limits of traditional spur gearboxes. Planetary gearboxes distribute load across multiple gears and through a rigid carrier and ring, significantly improving impact resistance while increasing torque capacity within the same diameter envelope. The Turnabot N20 Planetary Gearmotors are built around a true 12mm all-metal planetary gearbox, offering a substantial durability upgrade over spur gear motors of similar size. This design helps resist shaft bending, gear tooth shear, and retention failures that commonly end matches early in competitive weight classes. The Most Versatile Planetary Size The N20 planetary format is widely regarded as the best all-around size for small combat robots, offering a strong balance of torque, speed, and thermal capacity. With weights starting at 15.2g, N20 planetaries provide significantly more durability and torque margin than smaller motors while remaining compact enough for efficient chassis layouts. This makes the N20 planetary gearmotor an excellent choice for primary drive systems in antweight and beetleweight robots, as well as any application where consistent performance over a full match is critical. Output Shaft and Wheel Retention Each N20 planetary gearmotor features a robust output shaft with a machined retention notch and ships with a circlip for secure wheel retention. This system dramatically improves resistance to wheel loss under weapon hits and wall impacts, a common failure mode for spur gearmotors and smooth-shaft designs. Speed, Torque, and Electrical Considerations The Turnabot N20 Planetary Gearmotors are available in multiple speed options to support a wide range of drive styles, from controlled pushing bots to faster, more aggressive configurations. Published RPM values should be considered typical measured performance under standard conditions; engraved motor markings may not reflect final output speed once installed in a planetary gearbox or operated at different voltages. Manufacturer testing and recommendations frequently reference Malenki Standard and Malenki HV brushed ESCs, which are known to work well with these motors. Other brushed ESCs may also be used, provided their voltage capability and current handling match the selected motor variant and battery configuration. Always verify ESC and battery specifications when designing your drivetrain.
