TDK Corp showcased a prototype of a wireless power supply system targeted at AGVs (automated guided vehicles), transportation robots, etc at Ceatec Japan 2018, which took place from Oct 16 to 19, 2018, at Makuhari Messe, in Chiba City, Chiba Prefecture, Japan.
The system is a magnetic field resonance type with an output of 1kW. TDK plans to start volume production of the system in 2019.
A magnetic field resonance system transmits power by making the resonance frequency of the power-transmitting coil match that of the power-receiving coil. So, compared with existing electromagnetic induction systems, the reduction of power transmission efficiency caused by distance is smaller. In other words, it is possible to realize a long power transmission range.
The system developed by TDK can realize a power transmission range of 20-40mm though it depends on the size of coil. Moreover, the central axis of the power-transmitting coil can be up to 30mm away from that of the power-receiving coil, and vice versa. In addition to AGVs and transportation robots, TDK expects that the new system will be used for electric forklifts, etc.
With a short power transmission range, it is necessary to move a device equipped with a power-receiving coil only in the direction of the coil's axis and install a physical guide in order to unfailingly and safety move the power-transmitting coil to the power-receiving coil (and vice versa) in an actual power-supplying operation.