Honda, in collaboration with two construction companies, Taisei and Taisei Rotec, has announced the development of foundational technology for a wireless power transfer road system. This system utilizes magnetic coupling, embedding power transmitters beneath the road surface while vehicles are equipped with a receiver unit underneath.

Unlike static wireless charging, dynamic wireless power transfer (DWPT) technology enables vehicles to receive electricity while in motion. Honda expects this approach to reduce the frequency of stops at charging stations, enhancing convenience and extending the operating range of electric vehicles.

The system consists of three main components: an external direct current (DC) power source, power transmitters installed under the road surface, and a power receiver on the vehicle. Honda is responsible for developing the transmitters and receivers, Taisei manages the DC power supply system, and Taisei Rotec develops the road construction method that integrates these devices.

Honda stated that initial tests have assessed the system's load-bearing capacity when large commercial vehicles pass over it. The transmitter structure is optimized to withstand vehicles with a total weight of approximately 20 tons, while also considering the long-term durability of the road surface.

Illustration of wireless charging technology for electric vehicles in motion. Photo: Honda

Aiming for 150 kW charging capacity

Initially, Honda and its partners will construct a test road in Japan starting late 2026. They will evaluate durability through tests equivalent to 1 million vehicle passes, assess power transmission capabilities, and implement measures to limit electromagnetic field leakage.

Following this giai doan 1, the development team aims to test power transmission capabilities at a maximum output of 150 kW, suitable for large commercial vehicles. Tests will also evaluate the system's ability to maintain power transfer at high vehicle speeds. Honda plans to collaborate with Taisei and Taisei Rotec for public road trials starting in april 2027.

Honda believes DWPT is particularly well-suited for the logistics and transportation sectors. Long-haul trucks could receive additional energy while in transit, thereby reducing the need for excessively large battery packs or extended stops for charging.

However, for this technology to become widespread infrastructure, developers must address several challenges: the cost of road modifications, equipment durability, power transmission efficiency, electromagnetic safety, and methods for recovering investment costs.

Hai Dang (via Reuters)