Design of a Wireless Power Transfer Based Charging System for a 3-Wheeler Trolley Bicycle

This paper proposes the design and implementation of alow-frequency Wireless Power Transfer (WPT) basedcharging system for a 3-wheeler trolley bicycle aimed atlight electric mobility applications. The developed systemutilizes inductive coupling at 50 Hz with copper transmitterand receiver coils integrated with ferrite/laminated ironcores to enable safe and contactless charging of a 48 Vbattery pack. Vehicle dynamics analysis is performed todetermine tractive force, motor power, and batterycapacity, resulting in the selection of a 1.8 kW BLDC motorfor prototype validation. The WPT architecture consists ofan inverter-driven primary coil, magnetically coupledsecondary coil, rectifier stage, DC–DC converter, andbattery management interface. Therotical resultsdemonstrate regulated DC output of approximately 49–50V with power delivery of 400–500 W and overall systemefficiency in the range of 80–85% at typical operatingdistances. The proposed low-frequency WPT approachreduces dependence on physical connectors, improvesoperational safety, and minimizes maintenancerequirements. The study establishes the feasibility ofimplementing cost-effective wireless charging for smallelectric mobility platforms and provides a scalableframework for future urban logistics and campustransportation systems.