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Vibration, the Inner Rotor motor’s bridge structure results in smaller speed/torque fluctuation, smoother operation, and low noise, while the Outer Rotor motor’s cantilever structure leads to larger speed/torque fluctuation and high noise. Looking at Structural Complexity, the Inner Rotor is a complex structure with high manufacturing cost and high maintenance requirements, in contrast to the Outer Rotor’s simple structure, moderate manufacturing cost, and moderate maintenance requirements. In terms of Reduction Ratio Suitability, the Inner Rotor is ideal for high reduction ratio applications and offers higher transmission efficiency, whereas the Outer Rotor is suited for low reduction ratio applications and has a more compact structure. Finally, concerning Power Density, the Inner Rotor motor has fewer magnetic pole pairs, resulting in lower consumption, higher efficiency at high speeds, and high power density. Conversely, the Outer Rotor motor features more magnetic pole pairs, which translates to higher consumption, lower efficiency at high speeds, and low power density.
Bafang Hub Motor Structure Examples: Inner Rotor Gear Reduction Structure
Structure diagrams: Bridge Structure, Cantilever Structure
Bafang Product Examples: Inner Rotor Motors, suitable for eBike models requiring excellent noise control and high transmission efficiency:
H700 (250W Auto 2-Speed Hub Motor) – Urban Commuter eBikes
H410 (250W Hub Motor) – Urban eBikes H650 (3000W Hub Motor) – Off-road & Leisure eBikes M210 (250W Mid-drive Motor) – City and Tour eBikes M620 (1000W Mid-drive Motor) – Mountain eBikes
Outer Rotor Motors, better suited for models prioritising cost-effectiveness and structural simplicity:
H300 (250W Hub Motor) – City and Tour eBikes H550 (750W Hub Motor) – Fat-tire eBikes
Outer Rotor Gear Reduction Structure
Please note that the motor is just one part of the eBike system. The seamless integration of the controller, battery, display, and overall bike design is equally crucial. Bafang are committed to providing complete interconnected drive solutions, ensuring every eBike equipped with a Bafang system delivers outstanding performance and reliable quality.
Technology Serves the Experience There is no absolute superiority between inner rotor and outer rotor motors; the best choice is simply the one that fits the user’s needs. Bafang consistently adheres to a “user-centric” R&D philosophy, continuously advancing the innovation and integration of motor technology. Bafang believe the future of eBikes will be smarter, more efficient, and better serve the personalised needs of every cyclist. This article aims to help you gain a deeper understanding of motor technology and choose the right model. On your riding journey, Bafang is with you all the way!
www.bikebiz.com April 2026 | 41
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