| 摘要 |
PURPOSE:To eliminate a defect due to the abrupt change of a brake torque by detecting the interruption of power supply to a magnetic bearing winding of a magnetic bearing unit, and connecting a rotary drive winding through a regenerative brake circuit to a battery to generatively brake, thereby effectively utilizing energy. CONSTITUTION:When a SW15 is closed, a relay 17 detects to make contacts 181-183 to supply an AC from a motor drive circuit to a rotary drive winding 12. On the other hand, an alternating current 14 is rectified by a rectifier 21 to charge backup batteries 23a, 23b, to supply power through a magnetic bearing controller 24 to a bearing winding 13, thereby controlling the position of a rotational shaft 11. When the SW15 is opened, the relay 17 detects to make contacts 191-193 to convert an electromagnetic force due to the idling rotation of the coil 12 into a direct current via a regenerative brake controller 20, thereby charging the batteries 23a, 23b. Thus, the energy can be effectively utilized, the abrupt variation of the torque is prevented, thereby preventing the damage due to the contact of a stator with a rotor. |
