Nippon Kayaku and Japan Aerospace Exploration Agency (JAXA) collaboratively announced that they've successfully developed a motor coil that can maintain its peak power more than two times longer than a conventional model by using a breakthrough thermal conductive heat-resistant insulating material.
This new insulation, developed by Nippon Kayaku, can withstand a maximum operating temperature of 250°C. Furthermore, the improved heat transfer increases motor efficiency by 1%.
In a press release, JAXA stated:
"For an electric aircraft to efficiently take off, it is important to maintain maximum power for a brief period. However, a conventional motor cannot sustain maximum power for a long time or the coil will burn out due to the temperature increase. Thus the necessary output power was secured by using a bigger motor system, limit the operation time and maximum power of the motor, or by introducing a cooling system. Therefore, in order to realize a smaller high-performance electric aviation motor, JAXA has been seeking a coating for the motor coil that has both insulation properties and strength while promoting thermal conductivity."
So, to take off, electric aircraft need loads of power (for only 2-5 minutes), then it's on to normal flight. But there's no sense is using a monstrous motor if you only needs its power occasionally. That's why Nippon Kayaku and JAXA created this new insulating material. It allows a smaller motor to maintain peak power for a longer period of time.
This potentially groundbreaking solution could easily be applied to electric vehicles. The result would be smaller, lighter electric motors that still pack a punch when needed.