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An external rotor motor, also known as an outer rotor motor, features a unique design where the rotor, containing permanent magnets, revolves around the central stator. This configuration creates a large diameter and short axial length, resulting in a high torque density and a large inertia. Its compact, hollow-shaft design is ideal for direct-drive applications like cooling fans, drone propellers, and hub motors in electric vehicles. The rotor's outer casing also provides excellent heat dissipation to the surrounding environment, enhancing overall thermal performance and reliability. This makes it highly efficient for applications requiring compact size, high torque, and smooth operation.
The large diameter of the rotor generates high torque in a compact package. The distributed magnetic field also provides very smooth rotation with low cogging torque, ideal for precise control.
The outer rotor casing acts as a large, rotating heat sink, directly exposing the motor's hottest part (the magnets and windings) to the ambient air. This enhances cooling and improves thermal performance and reliability.
| Materials | Iron-based |
| Density | 6.8~7.2g/cm³ |
| Thickness | 12mm |
| Inner Diameter | |
| Maximum Outer Diameter | 42mm |
| Application | Automobile-EOP |
| Process | PM |
| Sintering Conditions | 1120±5℃ |
| Hardness | >62HRB |
| Weight | 43.88g |
