Magnetic bearing with phase-shifted loops

摘要

A magnetic bearing system has magnets for producing magnetic fields, and first and second members which are rotationally fixed together. Each of the members is provided with closed loops of electrically conductive material. The members and magnets are relatively rotatable about an axis of rotation so that the loops travel along a prescribed circular path relative to and through the magnetic fields. The magnetic fields subject the loops to magnetic flux to produce electromotive forces in the loops when the loops deviate from their prescribed circular paths. This induces an electrical current in the loops. The direction of this electrical current is such that, in the presence of the magnetic fields, Lorentz forces are exerted on the loops and the loop-carrying members in directions which are lateral with respect to the circular path. To minimize fluctuations which may cause damaging vibrations, the loops and electromagnets are arranged so that the leading ends of the loops on the first member enter their magnetic fields at times which are different from the times that the leading ends of the loops on the second member enter their magnetic fields.