Overview
Designed a pedal-assist system integrated into the chainring using BLDC FOC. Built and tested a 3D-printed prototype with real riders; patent pending.
Abstract
This paper presents the design, manufacturing, and experiment of a chainring-integrated pedal-assisted electric bike system that enhances accessibility, efficiency, and modu- larity. Addressing the limitations of current e-bike designs, the system integrates a BLDC motor into the chainring and uses field-oriented control (FOC) for respon- sive and natural torque assistance. Key innovations include a compact direct-drive structural architecture and torque-based assist algorithms. The prototype was built with 3D-printed components, demonstrating effective performance in lab tests. While refinement on system robustness is needed, the system offers a novel, cost-effective solution for general riders.
