| 摘要 |
PURPOSE:To aim at the promotion of small capacity in a power amplifier as well as the miniaturization of an electromagnet coil, by installing a mechanism capable of shifting a rotor to its stabilized position in time of the rotor being afloat. CONSTITUTION:In this magnetic bearing, permanent magnets 4a and 4b whose inner and outer circumferences are secured tight with ringlike yokes are installed in both upper and lower parts of a fixed shaft 1 being at the rotor side, while each of yokes 3a and 3b are set up at both upper and lower parts of the central part of the shaft 1 so as to surround electromagnet coils 6a and 6b being wound in ring form. Similar ringlike permanent magnets 5a and 5b are installed in both upper and lower parts of a rotor 2 in opposition to magnets 4a and 4b, and a permanent magnet 7 is installed in space between these yokes 3a and 3b at the central part. In this case, rings 9a and 9b being screwed in a top-and- bottom screw part made into a reversing screw to each other are installed in upper and lower rings 10 of a flange part of the rotor 2 whereby these rings 9a and 9b are engaged or disengaged by rotation of these rings 10, thus the rotor 2 is shifted to a stabilized position. |
