La University of Stuttgart, under the direction of Dr. Nejila Parspour, has achieved a new record in wireless energy transfer: 95% efficiency in stationary charging and 90% in mobile applications. This advancement puts wireless charging on par with conventional wired systems and opens the door to a transformation in electric mobility.
The technology is based on magnetic induction: a coil generates a field that transfers energy to another nearby coil. Although the principle is simple, achieving high levels of efficiency required advanced electronic components and control algorithms that optimize the transfer even with air gaps between coils.
Main Advantages
- Convenience: eliminates cables and connectors, reducing failure points.
- Reliability and Safety: less risk of electrical damage.
- Automation: the vehicle charges when parked at a designated point, without manual intervention.
- Dynamic Charging: possibility of recharging while the car is in motion, allowing for smaller and cheaper batteries.
- Bidirectionality: cars can return energy to the grid, acting as dynamic storage systems.
Current and Future Applications
Tesla already uses inductive charging in some of its autonomous vehicles in the U.S. The industry also applies it in robots and automatically guided vehicles, which recharge on the move for more efficient industrial processes.
In the medical field, wireless energy transfer enables cable-free implants and sensors, such as implanted heart pumps, improving safety and reducing infection risks.
Impact on Electric Mobility
The possibility of integrating wireless charging systems into streets opens up a completely new scenario:
- Lighter Vehicles: by reducing battery size, fewer critical materials like lithium are needed.
- Lower Costs: less dependence on scarce and expensive minerals.
- Greater Practical Range: cars could be continuously charged while driving.
- Integration with Renewable Energies: being bidirectional, vehicles can act as mobile batteries that stabilize the power grid.
Pending Challenges
Technical efficiency already allows for practical implementation, but challenges focus on infrastructure and regulation. Parspour emphasizes that greater openness to innovation is needed from the industry and political bodies to deploy these systems on a large scale.
Wireless charging for electric cars is no longer a laboratory experiment: it is a functional reality that promises to transform mobility and the energy system. With efficiencies close to 95%, dynamic applications, and bidirectional potential, this technology is poised to become a pillar in the transition towards a cleaner, connected, and sustainable future.
