This teenager designed motor has the potential to revolutionize the electric vehicle industry

https://103degrees.com/this-teenager-designed-motor-has-the-potential-to-revolutionize-the-electric-vehicle-industry/

"synchronous reluctance motor better torque and efficiency... 3-D printed plastic, copper wiring, steel rotor ... eliminate air gaps by adding another magnetic field... improve saliency ratio... at 300 rpm 39% more torque and 31% more efficiency... 37% improvement efficiency achieved increasing speed to 750 RPM... couldn’t test at higher revolutions per minute because the plastic pieces would overheat"