Why Outrunner Brushless Motors Predominate in Multirotors

As the demand for high-performance drones has surged, the choice of motors plays a significant role in determining the drone's performance and efficiency. One of the most crucial components in a multirotor's power system is the brushless motor. Within brushless motors, outrunner motors have emerged as the go-to choice for multirotor enthusiasts and professionals alike. This article explores why outrunner brushless motors are prevalent in multirotors.

High Power to Weight Ratio

A key factor in the popularity of outrunner brushless motors among multirotor enthusiasts is their high power to weight ratio. The power to weight ratio refers to the amount of power a motor can generate relative to its mass. This is especially critical in the context of multirotors, where every gram counts. Outrunner motors, which feature motors located outside the electric motor's shaft, are known for their lightweight construction. This allows for the efficient distribution of power among the propellers, resulting in better overall performance.

Superior Speed and Speed Control

Outrunner brushless motors excel in delivering high speed with lower torque. This characteristic makes them ideal for applications where a drone needs to achieve rapid acceleration and maintain a high cruising speed. In the case of multirotors, this translates to quick take-offs, swift maneuvers, and stable flight. The ability to control speed precisely is facilitated by the lightweight design of outrunner motors, which can be paired with efficient Electronic Speed Controllers (ESCs) to achieve optimal performance.

Minimal Resistance and Improved Efficiency

Another significant advantage of outrunner brushless motors is their minimal resistance. The design of the outrunner motor minimizes friction with the surrounding air, allowing the multirotor to move with less energy loss. This leads to increased efficiency and better overall performance. With less resistance, the motor can maintain its speed more easily, contributing to a more consistent and stable flying experience.

Conclusion

In summary, the widespread use of outrunner brushless motors in multirotors is due to their high power to weight ratio, ability to deliver high speed with lower torque, and minimization of resistance. These characteristics make them well-suited for achieving the optimal balance of speed, agility, and stability in multirotor applications.

Key Takeaways: - High power to weight ratio: Outrunner motors are lightweight, allowing for efficient power distribution. - High speed with lower torque: Ideal for quick take-offs and stable flight. - Minimal resistance: Enhances efficiency and performance.

Further Reading: - Drones Basics: How Brushless Motors Work in Drones - Hobby Drone Racing: Guide to Multirotor Motors - Electronics for You: Multirotor Drones and Brushless Motors

Keywords: multirotor, brushless motor, outrunner, inrunner, power to weight ratio