A magnetic bearing arrangement (1, 11, 21, 41, 51, 71) for a motion element, having the following features:
- a) the magnetic bearing arrangement (1, 11, 21, 41, 51, 71) has a stator;
- b) in the stator, the motion element (2, 13, 22, 42, 52, 72) is mounted movably in a motion direction (4, 20, 66);
- c) the magnetic bearing arrangement (1, 11, 21, 41, 51, 71) has a passive magnetic bearing (3, 8, 9;
- 14, 15, 16;
- 23, 25, 27;
- 24, 26, 28;
- 43, 45;
- 44, 46;
- 53, 54, 55, 56;
- 73, 74) for lateral guidance of the motion element (2, 13, 22, 42, 52, 72) and a controllable magnetic bearing (3, 5;
- 12, 14;
- 23, 29;
- 43, 48;
- 53, 57;
- 54, 58;
- 73, 75) for guidance of the motion element (2, 13, 22, 42, 52, 72) perpendicular to the guidance by way of the passive magnetic bearing (3, 8, 9;
- 14, 15, 16;
- 23, 25, 27;
- 24, 26, 28;
- 43, 45;
- 44, 46;
- 53, 54, 55, 56;
- 73, 74);
- d) the passive magnetic bearing has permanent magnets (3, 8, 9;
- 14, 15, 16;
- 23, 25, 27;
- 24, 26, 28;
- 43, 45;
- 44, 46;
- 53, 54, 55, 56;
- 73, 73) arranged on the motion-element side and on the stator side;
- e) the respectively adjacent permanent magnets (3, 8, 9;
- 14, 15, 16;
- 23, 25, 27;
- 24, 26, 28;
- 43, 45;
- 44, 46;
- 53, 54, 55, 56;
- 73, 74) are magnetized in mutually repulsive fashion;
- f) the controllable magnetic bearing (3, 5;
- 12, 14;
- 23, 29;
- 43, 48;
- 53, 57;
- 54, 58;
- 73, 75) exerts a magnetic force on the motion element (2, 13, 22, 42, 52, 72) perpendicular to its motion direction (4, 20, 66);
- g) the controllable magnetic bearing (3, 5;
- 12, 14;
- 23, 29;
- 43, 48;
- 53, 57;
- 54, 58;
- 73, 75) has a magnetizable stator element (5, 12, 29, 48, 57, 58, 75);
- h) the controllable magnetic bearing (3, 5;
- 12, 14;
- 23, 29;
- 43, 48;
- 53, 57;
- 54, 58;
- 73, 75) has an electronic stabilization device for controlling the magnetic force;
- i) the stabilization device has an electrical conductor (6, 7;
- 18, 19;
- 30, 31;
- 49;
- 60, 61, 62, 63, 76) that can have an electrical control current applied to it by the stabilization device and that is associated with the stator element (5, 12, 29, 48, 57, 58, 75) in such a way that the magnetization of the stator element (5, 12, 29, 48, 57, 58, 75) is influenced by the control current;
- j) the stabilization device has a position sensor for sensing the position of the motion element (2, 13, 22, 42, 52, 72);
- k) as a function of the signals of the position sensor, the stabilization device controls the control current in such a way that the motion element (2, 13, 22, 42, 52, 72) is held in a working position in which the passive magnetic bearing (3, 8, 9;
- 14, 15, 16;
- 23, 25, 27;
- 24, 26, 28;
- 43, 45;
- 44, 46;
- 53, 54, 55, 56;
- 73, 74) exerts on the motion element (2, 13, 22, 42, 52, 72) a magnetic force that is opposite to the magnetic force of the controllable magnetic bearing (3, 5;
- 12, 14;
- 23, 29;
- 43, 48;
- 53, 57;
- 54, 58;
- 73, 75);
- characterized by the following features:
- l) the controllable magnetic bearing (3, 5;
- 12, 14;
- 23, 29;
- 43, 48;
- 53, 57;
- 54, 58;
- 73, 75) has a permanent magnet (3, 14, 23, 43, 53, 54, 73);
- m) the permanent magnet (3, 14, 23, 43, 53, 54, 73) is arranged on the motion element (2, 13, 22, 42, 52, 72) opposite the stator element (5, 12, 29, 48, 57, 58, 75);
- n) the magnetic force between permanent magnet (3, 14, 23, 43, 53, 54, 73) and stator element (5, 12, 29, 48, 57, 58, 75) is dimensioned such that with a control current of zero, the motion element (2, 13, 22, 42, 52, 72) is held in the working position;
- and only upon deviation from that working position is a control current generated that influences the magnetization of the stator element (5, 12, 29, 48, 57, 58, 75) in the direction of re-establishing the working position.