What did Li Hongtao, an escaped prisoner, invent? What is a brushless motor in Li Hongtao?

He invented the brushless motor. Small and medium-sized three-phase synchronous generators are mainly divided into brushless motors and brushed motors.

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.

Brushless means that there is no carbon brush, no slip ring and carbon brush wear, and it does not need to be replaced. Brushless generators rely on independent excitation generators to provide magnetic fields. Adjusting the magnetic field of the excitation generator is equivalent to controlling the magnetic field of the generator. The advantages are that the exciter current is controlled to be small and the generator voltage is stable. Brushless generator provides magnetic field by rectifying excitation coil.

The exciter of brushless generator relies on electronic voltage regulator to control the magnetic field. Once the voltage regulator fails, the maintenance conditions are not easy to meet and it has to be replaced, which is also the short board of brushless generator.

Brushless generator consists of five parts: 1, main generator; 2. AC exciter; 3. Rotating rectifier device; 4. Automatic voltage regulator; 5. Permanent magnet exciter (optional component).

Extended data:

On February 8th, Li Hongtao was arrested for the third time after he escaped from prison. On the run, the only thing that can make Li Hongtao concentrate on is to invent the idea of "brushless motor". He studied radio and had an unusual interest in machinery. After his third arrest, he was detained in Liuzhou for a period of time.

1February, 993, Li Hongtao was escorted back to Kunming No.1 detention center. 1on April 26th, 993, Li Hongtao was formally arrested by the public security organs.

While waiting for the verdict in Kunming No.1 Detention Center, Li Hongtao took pains to tell the police about his requirements for doing experiments. Finally, after careful study, the leader of the institute took risks and agreed to his request. The detention center specially provided a cell for Li Hongtao to do experiments. Since then, he began to concentrate on experiments.

1993 12. the Supreme People's Court approved Li Hongtao's death penalty and issued a notice of execution to Kunming Intermediate People's Court. According to the regulations, the death penalty must be executed within seven days after the sentence is pronounced. Sun Eryun, director of Kunming No.1 Detention Center, personally invited many experts from Yunnan Electric Appliance Research Institute to the detention center for on-site guidance. Li Hongtao felt inspired by the expert's advice.

199365438+February 3 1, the experiment was successful. That night, the director Sun Eryun hastily wrote a report, demanding that Li Hongtao's execution be suspended and sent to the Kunming Public Security Bureau. The director of the Public Security Bureau personally gave instructions and formally submitted a request for suspension of execution to the Higher People's Court of Yunnan Province in the form of red-headed documents of Kunming Public Security Bureau.

After deliberation, the Provincial Higher People's Court quickly replied and agreed to suspend execution. The following year, in order to change Li Hongtao's sentence and gain time, the detention center applied for a patent for Li Hongtao, and at the same time, with the special approval of the competent department, Li Hongtao was taken to the Institute of Electrical Appliances to test the data and improve the model.

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. It is reported that when Li Hongtao applied for a patent, she was renamed "Yang Hongjun". In the next few years, Li Hongtao made many inventions and obtained three invention patents and three utility model patents. Due to Li Hongtao's significant meritorious service, he was sentenced to fixed-term imprisonment and suspended sentence, in line with the provisions of the law on commutation and commutation.

In 2002, Li Hongtao recalled his two successful escape experiences and decided to help the prison improve its management system. The computerized prison monitoring and management system jointly developed by the technical police of Li Hongtao and Kunming No.1 Detention Center was successful, and Kunming No.1 Detention Center jumped into the list of 20 demonstration detention centers in China.

References:

Patent inquiry network-cn95115186.x brushless electric excitation motor