Latest discoveries and innovations: magnetic suspension bearings have no mechanical wear
In a major breakthrough for China's high-tech industry, an expert appraisal committee led by Academician Wang Yuming from the Chinese Academy of Engineering announced today in Fuyang, Hangzhou, that significant progress has been made in the development of magnetic bearing technology. The first domestically produced magnetic bearing product, the "FS450 molecular pump magnetic bearing based on cross-feedback control," was successfully developed by Zhejiang Feixuan Technology Co., Ltd. This achievement marks a milestone in breaking foreign technological monopolies in the field of molecular pumps, positioning China as one of the few countries—alongside France, the United States, Canada, and Germany—to possess independent intellectual property rights in magnetic bearing technology.
Magnetic bearings, also known as active magnetic bearings, represent a new generation of high-performance bearings that operate without physical contact between the rotor and stator. These systems consist of mechanical components, electronic control units, sensors, and auxiliary bearings. By using electromagnetic forces to suspend the rotor in mid-air, they offer numerous advantages: no mechanical wear, low energy consumption, high rotational speed capabilities, reduced noise, extended service life, and the elimination of the need for lubricants. When applied to molecular pumps, magnetic bearings solve a critical issue—the oil vapor backflow caused by traditional lubrication methods—which can contaminate vacuum chambers. As a result, magnetic bearing-based vacuum molecular pumps have become the preferred choice for advanced integrated circuit manufacturing equipment, especially in high-vacuum applications.
This innovation represents a revolutionary advancement in the bearing industry, following the transition from oil and gas lubrication. It brings cutting-edge technology into traditional sectors and opens up new possibilities across various fields, including military, aerospace, petroleum, petrochemicals, and energy.
Hong Shenping, the general manager of Zhejiang Feixuan Technology Co., Ltd., who leads the research and development team, has pioneered the creation of magnetic bearings tailored for integrated circuit equipment. For the first time in China, the company implemented a 5-degree-of-freedom controlled magnetic suspension bearing in a molecular pump, utilizing cross-feedback control technology to address the gyroscopic effect of flexible rotors at high speeds, thereby enhancing rotor stability. This advanced motorized balancing technique significantly reduces rotor vibration, making the system more efficient and reliable.
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