At that time, the technology of self-controlled electric motors was very immature. If the corresponding technology could be developed, it would be of great help to many scientific research and medical undertakings in our country. Li Hongtao officially started experimental research and development of brushless motors in prison. Because Li Hongtao was really smart, the director of the detention center also knew about his experience and allowed him to conduct experiments in the prison. The director of the detention center was moved by Li Hongtao's scientific research spirit and hoped that he could develop a brushless motor to benefit society. He actively invited experts from the Yunnan Electrical Appliance Research Institute to help him experiment. Finally, the day before Li Hongtao was executed, he successfully made a "brushless electric excitation motor". After the director learned about this, he reported it to the Public Security Bureau overnight, hoping to temporarily stop his execution. After approval, the court immediately provided him with a two-year suspended sentence. If he can further innovate the technology during these two years, his sentence can be reduced on the original basis.