On-rotor electromagnetic energy harvester for powering a wireless condition monitoring system on bogie frames

To maintain desirable service quality and operational safety, a wireless monitoring unit integrated with the vibration energy harvesting technology becomes an available choice to achieve self-powered, maintenance-free, and real-time monitoring of the train.However, owing to the bulky size and split design, to collect the mechanical energy from the bogie frame movement is still a considerable challenge for conventional harvesters.Here, we proposed a compact all-in-one on-rotor electromagnetic energy harvester.The key novelty is that a counterweight acts as the friction pendulum to produce the desired relative motion between the coils and magnet and make the device more easily install on the wheelset.Besides, the layout of the magnetic materials and coils is optimized to improve the conversion efficiency.