US 7,023,117 B2 · Magnetic bearing arrangement

Abstract

A magnetic bearing arrangement (1) for a motion element, having the following features: the magnetic bearing arrangement has a stator. The magnetic bearing arrangement has a passive magnetic bearing (3, 8, 9) for lateral guidance of the motion element (2) and a controllable magnetic bearing (3, 5) for guidance of the motion element perpendicular to the guidance by way of the passive magnetic bearing. The controllable magnetic bearing has an electronic stabilization device; the stabilization device has an electrical conductor (6, 7) that can have an electrical control current applied to it by the stabilization device and that is associated with the stator element (5) in such a way that the magnetization of the stator element is influenced by the control current. The controllable magnetic bearing has a permanent magnet (3); the permanent magnet is arranged on the motion element opposite the stator element. The magnetic force between permanent magnet and stator element is dimensioned such that with a control current of zero, the motion element 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 in the direction of re-establishing the working position.

Claims32

Dependent claims

A magnetic bearing assembly, comprising:

a motion element having a working position,
a passive magnetic bearing exerting repulsive forces to the motion element thereby guiding said motion element in a first plane,
a controllable magnetic bearing for exerting a force to said motion element in a direction perpendicular to said first plane against the resistance of said repulsive forces of the passive magnetic bearing, said controllable magnetic bearing comprising:
a magnetizable stator element, and
an electronic stabilization device for controlling the magnetic force of said controllable magnetic bearing,
said stabilization device comprising
an electrical conductor for an electrical control current applied to said electrical conductor by said stabilization device, and
a position sensor for sensing a position of said motion element,
said passive magnetic bearing interacting with said stator element to hold said motion element in said working position without application of the electrical control current to said electrical conductor,
said controllable magnetic bearing being applied with the control current as a function of signals of said position sensor, when said motion element is deflected from said working position, thereby influencing magnetization of said stator element and causing said motion element to return to said working position, and
said controllable magnetic bearing being disposed only at one side of said motion element.

8 more elements

A magnetic bearing assembly comprising:

a motion element having a motion direction and a working position,
a passive magnetic bearing exerting repulsive forces to the motion element thereby guiding said motion element in a first plane, said passive magnetic comprising at least one permanent magnet,
a controllable magnetic bearing for exerting a force to said motion element in a direction perpendicular to said first plane against the resistance of said repulsive forces of the passive magnetic bearing, said controllable magnetic bearing exerting magnetic force on said motion element in a direction perpendicular to said motion direction, said controllable magnetic bearing comprising:
at least one magnetizable stator element, and
an electronic stabilization device for controlling the magnetic force of said controllable magnetic bearing,
said electronic stabilization device comprising:
at least one electrical conductor for an electrical control current applied to said electrical conductor by said stabilization device, and
a position sensor for sensing a position of said motion element,
said passive magnetic bearing interacting with said magnetizable stator element to hold said motion element in said working position without an application of an electrical control current to said electrical conductor,
said controllable magnetic bearing is applied with the control current as a function of signals of said position sensor, when said motion element is deflected from said working position, thereby influencing a magnetization of said magnetizable stator element and causing said motion element to return to said working positions,
said controllable magnetic bearing is disposed only at one side of said motion element.

8 more elements

Dependencies are inferred from the claim text.

Magnetic bearing arrangement

Life of this patent

Magnetic bearing arrangement

Life of this patent

Abstract

Claims32