1995, Li Hongtao invented "brushless electric excitation motor", which won the gold medal in the 5th China Patent Invention Expo and the first prize for outstanding invention.

Li Hongtao once escaped from prison three times because he was too clever to catch the police uncle. After he escaped from prison, he drove around in a police car and was sentenced to death. But in prison, he invented a patent through his knowledge of mathematics and physics, and won the gold medal in the invention fair. In this way, he successfully reborn from the death penalty line and became a fixed-term imprisonment.

Extended data brushless motor, also known as commutatorless motor DC commutatorless motor. It uses semiconductor inverter to replace the mechanical commutator in ordinary DC motor to form a commutatorless DC motor. It consists of motor body and driver, and is a typical mechatronics product.