Description

The stator dimensions, shaft diameter (5mm), and overall shape (Φ17.7×H14.5mm) of the two motors are completely identical. The main differences lie in the KV value and the corresponding power characteristics.

The 3100KV version features a lower speed and higher torque, making it suitable for use with larger propellers. It is commonly used in multi-rotor or fixed-wing models that require high endurance. With a continuous power output of 77W, its power output is moderate.

The 4000KV version boasts a speed increase of approximately 29% compared to the 3100KV version. It falls into the category of high-speed, low-torque models, making it a more suitable fit for high-speed cross-country drones equipped with small propellers. With its sustained power increased to 100W, it can withstand higher currents, but it also necessitates batteries and electronic speed controllers with superior discharge capabilities.

The no-load current and internal resistance of the two motors are the same, and their basic losses are close. When selecting, the main considerations are demand: if you require high pulling force but not extreme speed, choose 3100KV; if you seek high rotational speed and explosive power, choose 4000KV. Both have the same size and can be directly interchanged for installation.