Abstract：In order to eliminate the shortcomings of being easily damaged, short service life, high noise and slow rotating speed of traditional bearings, the electromagnetic bearings were used in the vertical high-speed pump. The basic structure, working principle, control system, electromagnetic force, stiffness characteristics and installation structure of the electromagnetic bearings were studied. Operating characteristics of the vertical high-speed pump after using electromagnetic bearings were also analyzed. It is showed that due to the properties of no contact, no lubrication and no friction, the application of electromagnetic bearings can effectively solve bearing failure problem of traditional bearings, prolong service life and slove sealing problem of high-speed pumps. Meanwhile, electromagnetic bearings have preferable stiffness characteristics, and the control system and loading capacity of electromagnetic bearings can fully meet the application requirements in high-speed pumps. After installing electromagnetic bearings, running stability, rotating speed and pump lift of high-speed pumps are obviously improved. But because of the increase of rotating speed, cavitation characteristics are more serious leading the leaf blades to be easily damaged, so the blade shape need to be further improved.
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