7. Magnetic Bearings: ( Types of Bearings )

Magnetic bearings use the concept of Magnetic Levitation to keep moving element in the air. It is a very popular bearing because there is no limit to the speed of the rotating element. Two types of magnetic bearings are available one is Active and the other is Passive. In Active type, we use an electric magnet which turns on as shaft moves out of position to take it back to the centre. In Passive type we use permeant or fixed magnet which is difficult to design.