Beijing’s New Energy Technology Achieves Breakthrough with Rotor Speed of 55,000 RPM

Revolutionizing Electric Drive Technology: Single Rotor Achieves 55,000 RPM

In a significant technological breakthrough for electric vehicle drive systems, a single rotor developed by BAIC Group’s Hainachuan company has successfully achieved an impressive speed of 55,000 revolutions per minute (RPM). This achievement has been certified by authoritative institutions and marks a new industry-leading standard.

The motor speed is a critical performance indicator for the power systems of new energy vehicles. Currently, among electric vehicles on the road, the highest motor speeds typically reach only 20,000 to 30,000 RPM. Higher speeds not only enhance a vehicle’s top speed but also optimize the motor’s size and weight, thereby improving the vehicle’s high-speed cruising capability, according to a representative from Hainachuan.

The breakthrough in rotor technology reflects the integrated strength of material development, structural design, and precision manufacturing, requiring advancements in each of these areas:

• Materials: The company’s technical team has successfully developed high-performance silicon steel materials, providing a solid foundation for stable high-speed operation of the motor.
• Structural and Process Design: Innovations such as carbon fiber winding techniques and optimization of rotor structure topology have created conditions for further speed enhancements.
• Manufacturing: Precise control of rotor weight allows the motor to maintain stable operation even at extreme speeds, resulting in approximately 5% improvement in performance and overall reliability.

These technological advancements were achieved at the Hainachuan factory located in Beijing’s Economic and Technological Development Area, where multiple models of motors have already been mass-produced. This project is the first of its kind in Beijing’s automotive motor sector, filling a critical gap in the city’s new energy vehicle supply chain.

The rotor that achieved the 55,000 RPM milestone is a single rotor, an essential component of the electric drive system responsible for the motor’s rotation and vehicle propulsion. While mass production of electric drives is still some time away, this breakthrough lays a solid foundation for future enhancements in motor speeds, which are expected to ultimately improve vehicle performance.

Testing and validating the ultra-high-speed rotor is a vital initial step towards advancing super-speed electric drives. “Having taken this first step, we will further explore breakthroughs in key technologies such as bearings, reducers, and control algorithms that support ultra-high-speed rotors, ultimately achieving high-speed assemblies with compact sizes,” the representative stated.

Beyond new energy vehicles, this technology is also being explored for applications in electric vertical takeoff and landing aircraft and other low-altitude economic equipment, meeting aviation-grade reliability standards. As a core component platform of BAIC Group, Hainachuan is gradually establishing comprehensive in-house research and development capabilities covering key systems such as hybrid dedicated transmissions, electric drive assemblies, motors, and motor controllers. Related products are expected to begin mass production in 2025 and have already secured multiple market orders, with a projected total sales revenue exceeding 27 billion yuan throughout their lifecycle.