A bearing that uses magnetic force to support a load. Some use permanent magnets and some use electromagnets. In addition, there are cases where the magnetic force is used as a repulsive force and other cases where it is used as an attractive force. In the case of electromagnets that use attractive force, an electronic circuit is required to detect the position of the shaft within the bearing clearance and control the electromagnetic force so that the shaft center position does not wobble. The advantages of magnetic bearings are that they can greatly reduce friction associated with rotation even at high speeds, they can be operated in a vacuum, and they do not require a lubrication oil supply system. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
磁力を利用して荷重を支える軸受。永久磁石を用いるものと電磁石を用いるものがある。また,磁力を反発力として用いる場合と吸引力として用いる場合がある。吸引力を用いる電磁石の場合には,軸受すきま内での軸の位置を検出して軸心位置がふらつかないよう電磁力を制御するための電子回路が必要である。磁気軸受の利点は,高速でも回転に伴う摩擦をきわめて小さくできること,真空中でも運転が可能なこと,さらに潤滑油供給システムが不要になること,などである。
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