The world's first permanent magnet suspension rotary machine was successfully developed

When a patient undergoes an operation or salvage through an artificial heart pump, the replacement of the heart pump due to wear of the pump bearings will result in life-threatening injuries to the patient. A permanent magnet bearing that can replace mechanical bearings can solve this problem. China has successfully developed the world's first permanent magnet suspension rotary machine.

Experts said that "this is a new mechanical revolution" and its significance lies in a major theoretical breakthrough - turning the principle of "impossible magnetic levitation to be stable" that the scientific community has considered for a century into a "can be stabilized" reality.

The permanent magnet bearing turbine jointly developed by Jiangsu University, Suzhou Shenhua Low Temperature Complete Equipment Co., Ltd. and Jiangsu University Electromechanical Plant has successfully carried out a full load test recently, and the speed has initially reached 20,000 rpm.

Permanent magnet suspension is a kind of permanent magnet or magnetic combination, which is balanced by the permanent magnet force of each other and without mechanical (ball bearing) contact. Well-known British scholar Ensau proved in 1839 that "a permanent magnet or a combination of magnets in a static state is only a function of the permanent magnet force between each other without any other external force and it is impossible to maintain stability in a stationary state." However, Qian Kunxi, a professor at Jiangsu University, believes that “Enso only made a 'unstable' conclusion about the permanent magnet's suspension under static conditions, and did not come to a conclusion on the stability of permanent magnet suspension under dynamic conditions.”

Qian Kunxi team struggling to drill for 10 years, using the gyro effect of the permanent magnet suspension to introduce artificial heart pump, to achieve a stable balance. The experiment confirmed that after the permanent magnetic suspension rotating body reaches a certain speed, it can be suspended in a stable manner and generate a gyro effect. Under dynamic conditions, the greater the rotation of the permanent magnetic suspension machinery is, the more stable it is and the higher the rotation speed is, the more stable it is, laying the foundation for the perfection and industrialization of the permanent magnetic suspension machinery. His achievements have won 3 national patents.

According to Qian Kunxi, at present, developed countries use electromagnetic levitation technology to produce bearings. The problem is that the technology is complex and unreliable. Permanent magnet bearings have long service life and low cost. “If the material is not aged, permanent magnet bearings can be used for decades.”