Latest discoveries and innovations: magnetic suspension bearings have no mechanical wear
In a significant development, the expert appraisal committee led by Academician Wang Yuming from the Chinese Academy of Engineering announced this afternoon in Fuyang, Hangzhou, that China has made a major breakthrough in magnetic bearing technology. The country's first domestically developed magnetic bearing product — "FS450 Molecular Pump Magnetic Bearing Based on Cross-Feedback Control" — was successfully created by Zhejiang Feixuan Technology Co., Ltd. This achievement marks a milestone in breaking foreign technological monopolies in molecular pump applications, positioning China among a select group of countries — including France, the United States, Canada, and Germany — that now 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 combine mechanical components, electronic control units, sensors, and auxiliary bearings to use electromagnetic forces to suspend the rotor in mid-air. This design offers numerous advantages: no mechanical wear, low energy consumption, high rotational speed capabilities, reduced noise, extended service life, and the elimination of the need for lubrication. By using magnetic bearings as the support system for molecular pump rotors, the issue of oil vapor backflow caused by traditional lubricated bearings is fundamentally resolved. As a result, magnetic bearing vacuum molecular pumps have become the preferred choice in integrated circuit manufacturing equipment, particularly for achieving ultra-high vacuum conditions.
This innovation represents a revolutionary step in the bearing industry, following the transitions from oil lubrication to gas lubrication. It brings advanced technology into a traditional sector, offering immense potential beyond just vacuum pumps. Applications span across critical fields such as military, aerospace, petroleum, petrochemicals, and energy, where precision, reliability, and performance are paramount.
Hong Shenping, the general manager of Zhejiang Feixuan Technology Co., Ltd., who also 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 motorized balancing technique significantly reduces rotor vibration, making the system more efficient and reliable.
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