The cooperation among industry, academia and research has borne rich fruits. The new generation of DC brushless motors has broken the foreign technological monopoly

The "High-Efficiency and energy-saving DC brushless motor" jointly developed by the Department of Electrical Engineering and Applied Electronic Technology of Tsinghua University has recently passed the national technical appraisal. This product has made significant breakthroughs in the application of permanent magnetic materials and the optimization of control algorithms, with its performance reaching the international leading level. It has broken the technological monopoly of foreign enterprises in the field of high-end DC brushless motors. It can be widely applied in fields such as industrial robots, new energy vehicles, and high-end equipment. ​
The core achievements of this cooperative research and development include: First, the development of the "Neodymium iron boron permanent Magnet gradient arrangement technology". By optimizing the distribution of permanent magnets inside the motor, magnetic leakage loss is reduced, and the motor efficiency is increased to 95%, which is 3 percentage points higher than that of similar foreign products. Each motor can save 1,200 kilowatt-hours of electricity annually. Second, the "Model Predictive Control Algorithm" was proposed, which solved the stability problem of the motor under high speed and heavy load. The maximum speed of the motor reached 15,000 RPM, and the load fluctuation adaptability range was expanded from ±10% to ±25%, which can meet the needs of scenarios such as new energy vehicle drive motors and industrial high-speed spindles. Thirdly, it adopts an "integrated heat dissipation structure". Through the seamless design of the motor housing and the heat dissipation fins, the heat dissipation efficiency is increased by 40%. The motor can operate continuously for 2000 hours without failure in a high-temperature environment of 60℃. ​
In the field of new energy vehicles, this motor has passed the rigorous tests of a certain automaker: in the range test, the power consumption of new energy vehicles equipped with this motor was reduced by 8kWh per 100 kilometers, and the range was increased by 120 kilometers. In the low-temperature performance test, the motor start-up success rate reached 100% at -30℃, and its operational stability was superior to that of foreign brands. In the field of industrial robots, the joint movement response speed of the robot driven by this motor has been increased by 20%, and the repeat positioning accuracy has reached 0.003mm, meeting the requirements of high-precision manufacturing.