Another important problem produced by magnetic bearings is limited fault protection. Machines with magnetic bearings always install a set of backup bearings, which are usually rolling element bearings. These backup bearings can produce their own set of problems. The placement of backup bearings can modify the machine’s rotor dynamic behavior. Backup bearings also have a very limited life. When a magnetic bearing fails, the backup bearing has to catch up in speed to the rotor in as little as a millisecond. Typically...
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...ing’s inadequate direct stiffness was also formerly mentioned. A bearing’s low direct stiffness occurs when the clearance is increased in order to contain the conventional backup bearings. This causes magnetic bearings to provide a large surface area to be able to support a moderate load. (Add innovation to low direct stiffness)
Magnetic bearings have provided us with new ways and innovations to run various systems such as space equipment and energy storage systems. Magnetic bearings have given people a way to run systems unlike any other bearing system. They have implemented a lubrication free and maintenance free system, which in turn provides a much cheaper and unblemished system. Although magnetic bearings are not perfect and are limited in specific areas, we believe they have the potential to revolutionize the field of mechanical power transmission.
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