Nowadays, electric bicycles have become popular all over the world. They are light and convenient, energy-saving and durable, non-polluting and noise-free, and are very popular among cyclists. Their economical cost and practical performance have gradually replaced bicycles and become the mainstream means of transportation. According to the Internet According to statistics, the number of bicycles in large and medium-sized cities across the country has exceeded one million, and the number of bicycles in small and medium-sized cities is also 200,000-500,000. The two major production bases in Shanghai and Tianjin in the north and south export a large number of overseas. A classmate of the author (formerly Tianjin Bicycle Factory), in Cuba in 2000 Build a factory to produce and sell bicycles and electric vehicles locally. It is said that many Chinese manufacturers are located in Latin America, Africa and other countries. So, who is the inventor of such a popular electric vehicle? What is the basis of the invention? Let me tell you. Invention Person: Li Qizu, former director of Tianjin Bicycle Factory No. 2. In the early 1990s, the national bicycle industry was the first to conduct research on mopeds. The variety was very irregular. Most of the ideas were inseparable from "power transmission". That is: an electric motor or a gasoline engine drives the rear wheel through a chain. .There are also those above the front wheel that generate power from the friction between the gasoline engine rubber wheel and the front belt. Because it is heavy and requires a lot of power, it was gradually eliminated soon after its introduction. Li Qizu was originally from Shanghai and worked as an engineer in the power department of Tianjin Bicycle Factory in the early 1970s. He was later promoted to the chief engineer of the factory. He was the chief designer of more than 20 automatic production lines in the factory. He was later transferred to the Second Bicycle Factory as the director and chief engineer. During this period, he was in charge of the general engineer office and development office, and the factory with ten thousand people was very successful. It has quickly changed its backwardness. (The details are not described in this article.) During his tenure, he often gave technical courses to young technicians to inspire everyone's enthusiasm for scientific research. I remember once, he talked about the problem of "perpetual motion". He said, "Permanent motion" Can motivation be realized? It is not certain now, but real assistance can be realized. I remind everyone to give up the original "power transmission" thinking and make a fuss about the principle of electric motor. It takes 5 years for a bicycle to start with the weight of a person. Kilogram thrust, due to inertia when riding, (acceleration) only requires 1 kilogram of thrust to maintain a constant speed. We only need to solve the problem of 5 kilograms of thrust, and the boost will be solved naturally... After that, everyone thought hard and came to no conclusion... ... On the day the mystery was revealed, the factory director brought a modified motor. The central axis of the motor rotor was lengthened and 10 cm protruded from both sides of the motor cover. When the power was turned on, the motor rotated smoothly... "Who can see the trick?" the factory director asked. "..." Silence. Next, he turned off the power and fixed both ends of the motor on a prepared U-shaped iron frame. : "Do you understand?" Ah! The atmosphere suddenly became lively and there was a lot of discussion. When the factory director turned on the power, the stator (casing) of the motor started to spin... It turned out that the rotor of the motor was turned into a rotor. It becomes a stator, and the stator becomes a rotor! Who would have thought of such a simple truth? Not long after, Tianjin’s first electric power-assisted bicycle came out.