Provided are a vacuum pump, a magnetic bearing device, and a rotor that suppress swinging and vibration of a rotor. A vacuum pump includes, in the following order in the exhaust direction of a gas, the center of gravity of a rotor, an active radial bearing that supports the rotor in the radial direction in a non-contact manner by using a magnetic force, and a passive radial bearing that supports the rotor in the radial direction in a non-contact manner using a magnetic force.

A radial stabilizer is provided for stabilizing levitation passive bearing elements against lateral displacements. The stabilizer provides a means to introduce anisotropy in the radial stiffness of the stabilizer. The presence of anisotropic stiffness has a strongly stabilizing effect on whirl-type rotor-dynamic instabilities. The stabilizer design also provides a means for continuously monitoring the state of health of the rotor by signaling the onset of changes of balance that would be expected to precede any major failure.

An iron-core linear motor forcer (100) with integrated aerostatic bearing guidance is disclosed. The motor forcer (100) comprises (i) an iron-core (10) enclosed within an enclosure (13) having an upper surface (11) and a bottom surface (12), wherein the iron-core (10) is mounted with a plurality of coil windings (16), and a plurality of air supply channels (50) are provided substantially in vertical from the upper surface (11) to the bottom surface (12) of the enclosure (13), and each of the air supply channels (50) is terminated at the bottom surface (12) with one or more orifices (32); and (ii) a linear motor stator (20) having a stator surface (22). The iron-core linear motor forcer (100) is frictionless moving on the motor stator (20).

The present disclosure relates to a stiffness enhancing mechanism for a magnetic suspension bearing, a magnetic suspension bearing including the stiffness enhancing mechanism, and a blood pump. The magnetic suspension bearing comprises a stator with stator teeth and a rotor disposed within the stator. The stiffness enhancing mechanism comprises: a rotor permanent magnet, a stator permanent magnet, and an axial driving body. The rotor permanent magnet and the rotor of the magnetic suspension bearing form a rotor assembly, which has an asymmetric structure with respect to the main plane (P) of the rotor. The stiffness enhancing mechanism is configured such that the stator permanent magnet generates a radial attractive force to the rotor permanent magnet, and the axial driving body generates an axial repulsive force to the rotor permanent magnet, wherein the magnitude of the axial repulsive force is variable with a change of an axial distance between the axial driving body and the rotor permanent magnet). The stiffness enhancing mechanism can increase the torsional stiffness of the rotor of the magnetic suspension bearing and facilitate the miniaturization of the magnetic suspension bearing.

A bearing includes an inner ring having an outer surface defining a first pocket therein. The surface of the first pocket can be provided with a first conductive coating. The bearing includes an outer ring concentric with and radially outward from the inner ring. The outer ring has an inner surface defining a second pocket therein, and a surface of the second pocket can be provided with a second conductive coating. A plurality of rolling elements are disposed between the inner ring and the outer ring. An electrically-conductive shunt ring assembly couples the inner ring to the outer ring and is configured to inhibit electrical current passing between the inner ring and outer ring from passing through the rolling elements. The shunt ring assembly is sized and configured to enable lubricant to flow freely through the bearing. In some embodiments, the shunt ring is a conductive snap ring.

A bearing includes an inner ring having an outer surface defining a first pocket therein. The surface of the first pocket can be provided with a first conductive coating. The bearing includes an outer ring concentric with and radially outward from the inner ring. The outer ring has an inner surface defining a second pocket therein, and a surface of the second pocket can be provided with a second conductive coating. A plurality of rolling elements are disposed between the inner ring and the outer ring. An electrically-conductive shunt ring assembly couples the inner ring to the outer ring and is configured to inhibit electrical current passing between the inner ring and outer ring from passing through the rolling elements. The shunt ring assembly is sized and configured to enable lubricant to flow freely through the bearing. In some embodiments, the shunt ring is a conductive snap ring.

Provided are a vacuum pump, a magnetic bearing device, and a rotor that suppress swinging and vibration of a rotor. A vacuum pump includes, in the following order in the exhaust direction of a gas, the center of gravity of a rotor, an active radial bearing that supports the rotor in the radial direction in a non-contact manner by using a magnetic force, and a passive radial bearing that supports the rotor in the radial direction in a non-contact manner using a magnetic force.

A radial stabilizer is provided for stabilizing levitation passive bearing elements against lateral displacements. The stabilizer provides a means to introduce anisotropy in the radial stiffness of the stabilizer. The presence of anisotropic stiffness has a strongly stabilizing effect on whirl-type rotor-dynamic instabilities. The stabilizer design also provides a means for continuously monitoring the state of health of the rotor by signaling the onset of changes of balance that would be expected to precede any major failure.

An iron-core linear motor forcer (100) with integrated aerostatic bearing guidance is disclosed. The motor forcer (100) comprises (i) an iron-core (10) enclosed within an enclosure (13) having an upper surface (11) and a bottom surface (12), wherein the iron-core (10) is mounted with a plurality of coil windings (16), and a plurality of air supply channels (50) are provided substantially in vertical from the upper surface (11) to the bottom surface (12) of the enclosure (13), and each of the air supply channels (50) is terminated at the bottom surface (12) with one or more orifices (32); and (ii) a linear motor stator (20) having a stator surface (22). The iron-core linear motor forcer (100) is frictionless moving on the motor stator (20).

A vertically mounted and magnetically driven power generation apparatus has multiple shelves vertically arranged and spaced apart. Each shelf has a through hole tapering downwards. A spindle is mounted through the multiple through holes. A motor driving the spindle and a primary power generator driven by the spindle and located below the motor are mounted around the spindle. Because of the weight of the primary power generator, adding additional weight is not need. A magnetic driven member is mounted around the spindle and located within a corresponding through hole. Multiple magnetic drive assemblies are mounted on inner walls of the multiple through holes. Each magnetic driven member is subject to forces of magnetic repulsion caused by first and second magnetic drive members of a corresponding magnetic drive assembly for the spindle to be rotated under a friction-free condition to enhance torque and rotation speed of the spindle.