205results about "Magnetic bearings" patented technology

The invention relates to the technical field of magnetic suspension bearings, and provides a magnetic leakage prevention bearing structure which comprises a flux sleeve, a shell, a magnetic part, an inner-layer magnet yoke and an outer-layer magnet yoke. The shell is sleeved outside the flux sleeve, and an inner ring of the shell is provided with a mounting space; the magnetic part is arranged in the mounting space; the inner-layer magnet yoke is arranged in the mounting space and connected with the shell, the inner-layer magnet yoke is concaved inwards to form a first containing groove, and the magnetic part is contained in the first containing groove; the outer-layer magnet yoke is arranged in the installation space and connected with the shell, the outer-layer magnet yoke is concaved inwards to form a second containing groove, and the inner-layer magnet yoke is contained in the second containing groove. A closed magnetic circuit is formed through a double-layer magnet yoke nested structure, the axial magnetic shielding layer design is matched, magnetic flux leakage is effectively restrained, the magnetic field energy utilization rate is increased, electromagnetic interference to external equipment is reduced, and meanwhile the bearing performance and operation stability of the bearing are remarkably improved by optimizing magnet yoke thickness distribution and the permanent magnet arrangement mode.

The invention discloses an elastic support liquid magnetic composite bearing journal bearing which comprises a bearing bush, a base body arranged on the outer side of the circumference of the bearing bush and a support layer arranged between the base body and the bearing bush, the bearing bush comprises a first permanent magnet layer and a lining layer arranged between the first permanent magnet layer and a journal, the lining layer is provided with a liquid film, the liquid film is arranged between the lining layer and the journal, and the first permanent magnet layer is arranged on the lining layer. The first permanent magnet layer comprises a permanent magnet and a protective shell thereof; a second permanent magnet layer is further arranged on the inner side of the circumference of the liquid film, and the supporting layer comprises an elastic layer arranged between the bearing bush and the base body; the elastic layer comprises elastic elements; according to the bearing, the liquid film is arranged between the lining layer and the shaft neck, and the permanent magnets are arranged in the first permanent magnet layer and the second permanent magnet layer, so that a dynamic complementary mechanism of liquid film dynamic pressure and magnetic suspension force is formed, and the comprehensive bearing capacity is improved.

A vacuum pump (1), preferably a turbo molecular pump, comprises a rotor shaft (9) configured to have one or more rotor blades (8) coupled thereto, and the rotor shaft (9) defines a bearing seat (7) housing a permanent magnet bearing in an interference fit configuration, the magnetic bearing insert comprises one or more permanent magnet alloy rings (3, 4, 5) of a rotor bearing half of a permanent magnet bearing and a radially outwardly extending sleeve (16) coupled thereto around an outer periphery of the or each permanent magnet alloy ring (3, 4, 5), and the outer surface of the permanent magnet bearing insert (3) engages with the inwardly facing wall of the bearing seat (7) to provide an interference fit wherein the coefficient of thermal expansion of the radially outwardly extending sleeve (16) is at least substantially the same as the coefficient of thermal expansion of the material of the rotor shaft (9) defining the engaged bearing seat wall.

The invention discloses a power supply system for a magnetic suspension bearing controller. The power supply system comprises an alternating current / direct current voltage conversion unit, a switch control unit, a voltage selection unit, an energy storage unit, a motor, a rectification filtering unit and a direct current / direct current voltage conversion unit, the rectifying and filtering unit rectifies and filters alternating-current voltage output by the motor to generate second direct-current voltage, the direct-current / direct-current voltage conversion unit boosts or reduces the second direct-current voltage to generate third direct-current voltage, and the switch control unit controls on-off of branches where the rectifying and filtering unit and the direct-current / direct-current voltage conversion unit are located. According to the power supply system provided by the invention, natural seamless switching among three power supplies can be realized in the whole process of a magnetic suspension motor system from normal working to tripping power failure to the speed reduction of a rotor below a safe speed value and stopping on an auxiliary bearing, so that safe shutdown of a magnetic suspension motor under a power loss condition is ensured.

A magnetic bearing device is proposed for the contactless magnetic bearing of a rotor (3) comprising a disk-shaped or ring-shaped magnetically effective core (31), wherein the magnetic bearing device has a stator (2) comprising a plurality of coil cores (25), each of which comprises a longitudinal leg (26) extending from a first end (261) in an axial direction (A) to a second end (262), and a transverse leg (27) arranged at the second end (262) of the longitudinal leg and extending in a radial direction perpendicular to the axial direction (A), wherein at least one concentrated winding (61) is provided on each longitudinal leg (26) surrounding the respective longitudinal leg (26), wherein the stator (2) further comprises a cup-shaped recess (211) into which the rotor (3) can be inserted.wherein the cup-shaped recess (211) is arranged at an axial end of the stator (2), wherein the transverse legs (27) are arranged around the cup-shaped recess (211), and wherein a plurality of magnetic field sensors (8) for determining the position of the rotor (3) are arranged around the cup-shaped recess (211). An annular holding device (9) for the magnetic field sensors (8) is provided, and that in the magnetic bearing device, a circuit board (7) is arranged between the windings (61) and the transverse legs (27) with respect to the axial direction (A), on which all magnetic field sensors (8) are arranged, and that the holding device (9) is designed to receive the circuit board (7). Furthermore, a centrifugal pump with such a magnetic bearing device is proposed.

The invention relates to a three-degree-of-freedom target disc type vertical active magnetic suspension bearing structure. A multi-end pole shoe type electromagnetic circuit assembly comprises a magnet yoke, and a plurality of pole shoes are led out from the single side of the magnet yoke; the plurality of multi-end pole shoe type electromagnetic circuit assemblies are uniformly distributed on the mounting plate at equal angles; the mounting plate is fixed on an external supporting structure, and a round hole is formed in the center of the mounting plate; the rotor assembly comprises a rotating shaft and a rotor magnetic gathering disc which are fixed into a whole; one side of the rotor magnetic gathering disc is provided with a plurality of concentric annular magnetic gathering teeth which directly face the pole shoes one by one, and the rotating shaft vertically penetrates through the circular hole and is matched with the circular hole. According to the invention, magnetic focusing coupling is formed by magnetic flux at the end parts of the electromagnets and the inner and outer ring magnetism gathering teeth of the rotor, so that magnetic force concentration and effective bearing are realized, non-contact suspension support is obtained by using fewer actuators and more direct magnetic circuit action, the system complexity and the manufacturing cost are reduced on the structure level, and the reliability of the system is improved. And meanwhile, the adaptability to miniaturized machinery and lower control precision conditions is improved.

This application provides a displacement sensor and a magnetic levitation system. The magnetic levitation system includes a magnetic levitation bearing and a displacement sensor. The displacement sensor includes: a first magnetic source mounted on the rotor shaft of the magnetic levitation bearing, used to generate a magnetic field; a substrate fixedly disposed at a distance from the first magnetic source, with a central hole for the rotor shaft to pass through; and a Hall array including multiple Hall chips, each attached to and electrically connected to the substrate. The Hall chips are distributed around the central hole, and each Hall chip can detect the magnetic flux density at its respective location to obtain position information of the first magnetic source and the rotor shaft. Compared to traditional magnetic levitation bearings, this application uses fewer displacement sensors, thus reducing the installation space occupied by the displacement sensors. It is also suitable for applications where the rotor shaft is extended.

This invention provides a combined bearing, comprising a housing, a motor, a spindle, an axial support assembly, and a radial support assembly. The motor is mounted on the middle of the spindle, and the axial and radial support assemblies are respectively mounted on both ends of the spindle along its axial direction. The axial support assembly includes an axial magnetic levitation bearing, an angular contact ball bearing, and an axial displacement sensor. The radial support assembly includes a radial magnetic levitation bearing, a deep groove ball bearing, and a radial displacement sensor. The inner rings of both the deep groove ball bearing and the angular contact ball bearing are formed by the spindle, and the outer rings of the angular contact ball bearing and the axial magnetic levitation bearing are anti-rotationally fitted, as are the outer rings of the deep groove ball bearing and the radial magnetic levitation bearing. Addressing the shortcomings of existing technologies, this invention provides a combined bearing with compact axial dimensions, long service life, and strong fault tolerance.

The invention discloses a magnetic suspension and air suspension hybrid bearing system and a rotor structure and a control method thereof, and relates to the technical field of fans, and the system comprises a permanent magnet biased rotor structure, a stator core, a magnet exciting coil and an air dynamic pressure foil bearing assembly. The foil of the bearing assembly is made of a magnetic conductive material, so that the foil and the magnet exciting coil share the same radial air gap, and the air gap serves as a magnetic field channel and a dynamic pressure air film space at the same time. According to the operation control method, based on a rotating speed signal, magnetic suspension bearing is achieved through the magnet exciting coil in the starting and low-speed stages, and gas film complete bearing is switched in the high-speed stage. Through structure fusion and time-sharing control, the problem of magnetic circuit shielding is solved, the advantages of magnetic suspension friction-free starting and stopping and high speed and high efficiency of an air floating bearing are integrated, the state monitoring function is achieved, the system is compact and reliable, and the cost is optimized.

A passive magnetic bearing assembly (10) for a vacuum pump and a vacuum pump having such a bearing are disclosed. The invention relates to a passive magnetic bearing assembly having a plurality of pairs of ring magnets (20, 30) arranged in a stack, one of the ring magnet pairs being arranged on a stator side (4) of the bearing and the other of the ring magnet pairs being arranged on a rotor side (2). The ring magnets are radially magnetized and each rotor ring magnet comprises at least a first harmonic of magnetic inhomogeneity, where the magnetic inhomogeneity is measured as a ratio between a 0-peak variation of remanence [Delta] Bi and an average remanence BR0, the first harmonic of magnetic inhomogeneity being less than 3%.

A radial actuator for a magnetic radial bearing module. The radial actuator 1 comprises an arrangement of coils 2 that are disposed around a central axis XX′. Each coil is formed by a laminated core 3 and by a winding wire 12 electrically insulated from said laminated core 3. The radial actuator 1 includes two separate opposite flanges 5. The flanges are made of an electrically insulating material. The flanges are disposed on either side of the laminated core 3 of at least one of said coils 2. The winding wire 12 of said coil 2 is wound around the two flanges 5 and coming into contact with said flanges.

This disclosure relates to a design method for a magnetic levitation bearing and a magnetic levitation bearing itself. The design method includes: obtaining key parameters of the magnetic levitation bearing affected by high temperatures; constructing a parametric model of the target design parameters of the magnetic levitation bearing based on the key parameters; and determining the parameter values ​​of each target design parameter at the target temperature based on the parametric model. This disclosure enables the design of magnetic levitation bearings suitable for use in high-temperature environments, expanding the application environment of magnetic levitation bearings beyond medium and low temperature environments, thus broadening the applicable temperature range and increasing the application scenarios of magnetic levitation bearings.

A rotary machine has a stator (13) and a rotatably mounted rotor (11), wherein one or more magnetic field sensors (12) are fixedly arranged at a radial distance with respect to the stator (13) from an axis (20) fixed with respect to the stator (13), and at least one measuring device (1) is designed to detect a change in the magnetic field by means of the magnetic field sensors (12), the rotor (11) being designed to generate one or more electrical signals by means of one or more constant magnetic source voltages and one or more of the magnetic field sensors (12), respectively, which have signal components corresponding to the rotor rotation frequency (171) and the respective distance between the magnetic field sensors (12) and the rotor (11), characterized in that a demodulator unit (4) is provided, which is designed to demodulate the signals generated by the magnetic field sensors (12) or derived therefrom, so as to generate signals (140) corresponding to the distance between the rotor (11) and the magnetic field sensors (12) corresponding to the respective signals.

A vacuum pump 10, such as a turbomolecular pump, comprises a rotor 12 in a housing 26 and comprising a rotor shaft 32. A stator 14 in the housing cooperatives with the rotor. A magnet device 16 acts o

A magnetic bearing device is proposed for the contactless magnetic bearing of a rotor (3) comprising a disk-shaped or annular magnetically active core (31), wherein the magnetic bearing device comprises a housing (10), a stator (2) and a control device (40), wherein the stator (2) comprises a plurality of coil cores (25), each of which has a longitudinal leg (26) extending from a first end (261) in an axial direction (A) to a second end (262), and a transverse leg (27) arranged at the second end (262) of the longitudinal leg, wherein at least one concentrated winding (61) is provided on each longitudinal leg (26), which surrounds the respective longitudinal leg (26), wherein the stator (2) further comprises a cup-shaped recess (211) into which the rotor (3) can be inserted, wherein the cup-shaped recess (211) is arranged at a axial end of the stator (2),wherein the control unit (40) comprises a circuit board (41) with a front side (411) and a back side (412), wherein circuit breakers (420) for controlling the windings (61) are arranged on the front side (411), wherein the housing (10) comprises an outer wall (15), a stator housing (101) for receiving the stator (2), a control housing (102) for receiving the control unit (40), and a partition wall (103) which separates the stator housing (101) from the control housing (102). On the partition wall (103) and adjacent to the outer wall (15) there is arranged at least one web (8) which projects into the control housing (102), the rear side (412) of the circuit board (41) being supported on the web (8), a plurality of the circuit breakers (420) being arranged in the region of the circuit board (8) with which the rear side (412) of the circuit board (41) is supported on the web (8),and wherein thermal connecting elements (85) for dissipating heat are provided between the plurality of circuit breakers (420) and the web (8).

A magnetic bearing module (1) having a position sensor (2) and a magnetic bearing (3) is disclosed. One of a connection face (5, 6) of the position sensor (2) and a connection face (9) of the magnetic bearing (3) is provided with three pegs (22, 23, 24). Each peg has a shape exhibiting symmetry of revolution of which the axis (L22, L23, L24) is parallel to the axis (L1) of the module (1). The angular spacing between the first peg (22) and the second peg (23) is 90°. The angular spacing between the second peg (23) and the third peg (24) is 90°. The other of the connection face (5, 6) of the position sensor (2) and the connection face (9) of the magnetic bearing (3) has three accommodating notches (32, 33, 34) inside each of which is mounted one of the three pegs (22, 23, 24).

An assembly is provided for a turbine engine. This assembly includes a stationary structure, a rotating structure, a magnetic-foil bearing and a cooling system. The rotating structure is rotatable about an axis. The magnetic-foil bearing radially supports the rotating structure within the stationary structure. The magnetic-foil bearing includes a magnetic bearing stator, a magnetic bearing rotor and a foil bearing. The foil bearing is disposed radially between the magnetic bearing stator and the magnetic bearing rotor. The cooling system includes a cooling circuit configured to deliver cooling air to at least a first bearing component. The first bearing component is configured as or otherwise includes one of the magnetic bearing stator, the magnetic bearing rotor and the foil bearing.

A radial-axial integrated magnetic bearing for an energy storage device, includes a bearing rotor and a bearing stator. Further disclosed is an energy storage device including the radial-axial integrated magnetic bearing.

According to the permanent magnet biased radial magnetic suspension bearing, a stator comprises a stator iron core which is annularly arranged, a plurality of teeth which extend out in the radial direction are arranged on the inner circumference of the stator iron core, and a permanent magnet is arranged at the end of each tooth; the coils are arranged on the teeth in a one-to-one correspondence mode. For each radial degree of freedom of the rotor, a plurality of coils are selected from the coil units to form a control winding in a series-parallel connection mode; the controller is used for applying a forward or reverse control signal to the control winding according to the offset of the rotor at the corresponding radial degree of freedom; the power amplifier is used for amplifying the forward or reverse control signal of the controller; and the displacement sensor is used for detecting the offset of the rotor at the corresponding radial degree of freedom in real time, and the controller outputs a control current instruction according to the offset. According to the invention, the rotor can be stably suspended by distributing small control current, and the number of power amplifiers is greatly reduced.

The application discloses a kind of permanent magnet water-lubricated bearings with double eccentric cylinder composite bearing bush of staggered structure, including bearing shell, permanent magnet unit, bearing end cover and double eccentric cylinder composite bearing bush.The application uses magnetic force support technology on the basis of traditional water-lubricated bearing, permanent magnet unit can provide upward magnetic force and its radian value range ensures that magnetic force direction is upward, reduces the load of water-lubricated bearing on rotating shaft, improves lubrication state, reduces friction and wear of water-lubricated bearing.At the same time, the bearing bush is designed into double eccentric cylinder structure, which can reduce the air gap between permanent magnet block and bearing bush, increase magnetic force, and further reduce the load on water-lubricated bearing.The application adopts double-layer bearing bush with significant difference in material elastic modulus, which meets the needs of water-lubricated bearing wear resistance, vibration and noise reduction, and unbalanced load resistance.The application adopts staggered structure, which can improve the lubrication state between shaft and bearing bush, promote the generation of dynamic pressure lubrication, and thus enhance the fluid dynamic pressure effect.

The application relates to a control unit (100) for a blood pump (200), an implantable blood pump (200), a pump system and a method for controlling a blood pump (200), wherein the blood pump (200) comprises an axial flux motor (210) with a stator (220) and a magnetically posable rotor (240) rotatable about an axis of rotation for pumping blood, wherein the stator (220) comprises at least three, in particular exactly three, coil groups (230) arranged coplanarly around the axis of rotation, wherein each of the coil groups (230) comprises a plurality of adjacent and coplanarly arranged stator coils (221).The control unit (100) is configured to determine parameters for a respective electric current through each of the stator coils (221) such that an axial force (501) is exerted on the rotor (240) by the stator (220) for active magnetic bearing of the rotor (240) in the axial direction, and a respective tangential force (502) is exerted on the rotor (240) by each of the coil groups (230) in the tangential direction, wherein the control unit (100) is configured to determine mutually independent parameters for each of the tangential forces that can be generated by the coil groups (230) such that an effective radial force (503) for bearing the rotor (240) in the radial direction results from the tangential forces.

The invention belongs to the technical field of permanent magnet thrust bearing assembly, and discloses a permanent magnet thrust bearing self-centering assembly device and a design method. According to the self-centering assembling device for the permanent magnet thrust bearing, a large-stroke hydraulic cylinder is used for pushing an inner rotor of the permanent magnet thrust bearing into an outer stator of the permanent magnet thrust bearing, and a rolling friction pair composed of a sliding rail and a sliding block always provides radial support for a piston rod of the hydraulic cylinder and a mounting shaft; after the assembly is completed, the quick resetting of the self-centering assembly device of the permanent magnet thrust bearing can be completed only by disassembling the screw between the mounting shaft and the inner rotor of the permanent magnet thrust bearing; meanwhile, according to the design method of the permanent magnet thrust bearing self-centering assembly device, acting force between the magnetic rings is ingeniously converted into device internal force which exists as static friction force, the size of a connecting piece is reasonably designed to ensure that the static friction force continuously plays a role, and impact vibration caused by sudden change of the acting force between the magnetic rings is relieved through a hydraulic damper. And a conical surface matching scheme is adopted, so that a self-centering assembly state can be achieved without human intervention.

The application provides a magnetic fluid sealed hybrid magnetic bearing, which comprises a base, a magnetic bearing assembly, a displacement sensor and a protection bearing assembly, the magnetic bearing assembly comprises an active control side stator, a permanent magnet ring, a magnetic conductive ring pole shoe, a control coil, a radial magnetic bearing rotor laminated sheet and a rotor, the control coil is used for pulling the rotor back to a balance position when the rotor is not in the balance position, the end of the rotor is provided with a magnetic fluid spiral groove, a magnetic fluid is arranged between the magnetic fluid spiral groove of the rotor and the magnetic conductive ring pole shoe, the magnetic fluid spiral groove is used for realizing the rotation shaft dynamic sealing of the magnetic fluid, the permanent magnet ring is used for providing an additional constant magnetic field for the magnetic fluid and providing a permanent magnetic bias magnetic path between the active control side stator and the radial magnetic bearing rotor laminated sheet, and the magnetic conductive ring pole shoe is used for serving as a control pole shoe of the magnetic fluid and closing the permanent magnetic bias magnetic path of the hybrid magnetic bearing. The technical scheme of the application is applied to solve the technical problem of the excessive length of the axial length of the magnetic fluid sealed magnetic bearing in the prior art.

An electric machine with an electrodynamic bearing comprises a rotor (101) from which a magnetic field emanates and a stator comprising a pair of windings (105, 106). The pair of windings (105, 106) are electrically coupled in parallel to provide electrodynamic positioning of the rotor (101) with respect to the pair of windings (105, 106) along a translational axis (306). The windings (105, 106) having different impedances as a result of at least one of the following: One winding has an impedance that is nominally different from that of the other winding. The impedance of the one winding and that of the other winding vary in a different way with a displacement of the rotor (101) along the translational axis. A sensing circuit (305) indicates a movement direction of the rotor (101) along the translational axis. A driver (301) applies a drive signal (307) to the pair of windings (105, 106) causing a drive current to flow in the pair of windings (105, 106). The drive signal (307) is controlled so that the drive current has a d-axis component generating a d-axis magnetic field emanating from the pair of windings (105, 106). The d-axis magnetic field exerts a force on the rotor (101) opposite to the movement direction of the rotor (101) along the translational axis. This allows stable operation over a relatively wide speed range.

A pump (100) includes a stator (220), a rotor (230) , and an impeller (250). The stator may include one or more electromagnets and one or more permanent magnets (222). The rotor includes an armature (234), one or more complementary permanent magnets (232), and a pull magnet (228) configured to position the rotor in an axial direction. The rotor is disposed within the stator. The complementary permanent magnets (232) and the one or more permanent magnets (222) of the stator create magnetic bearings. The armature (234) is aligned with at least one of the electromagnets of the stator and configured to rotate the rotor with respect to the stator. The impeller (250) is coupled to the rotor.

To provide a bearing device that is excellent in corrosion resistance to fluorine gas, and is also excellent in dimensional accuracy and durability.SOLUTION: A bearing device to be used in a fluorine gas environment is provided. The bearing device comprises: a magnetic bearing comprising a magnetic body and an electromagnetic coil; and a touchdown bearing for protecting the magnetic bearing, and comprising an inner ring, an outer ring, and a plurality of rolling bodies arranged between the inner ring and the outer ring. The inner ring and the outer ring of the touchdown bearing is made of a NiCrAl alloy.SELECTED DRAWING: Figure 1

A method of manufacturing a permanent magnetic bearing insert for a vacuum pump comprising a rotor shaft defining a cavity configured to receive the magnetic bearing insert in an interference-fit configuration, the method comprising the steps of: a) providing one or more permanent magnet alloy rings of a rotor bearing half of a permanent magnetic bearing; b) masking one or more surfaces of the or each permanent magnet alloy ring which are configured to substantially interface with another surface of the permanent magnetic bearing insert and / or the rotor shaft cavity when the permanent magnetic bearing insert is received by the rotor shaft cavity; and c) applying a coating to the or each permanent magnet alloy ring; wherein step b) substantially prevents those masked surfaces from being coated during step c); and wherein step b) and step c) are carried out substantially externally from a vacuum pump.

The application provides a five-degree-of-freedom magnetic suspension bearing and motor, wherein the five-degree-of-freedom magnetic suspension bearing comprises a magnetic conducting sleeve, the axial two ends of the magnetic conducting sleeve are respectively provided with a radial magnetic conducting ring extending radially inward along the magnetic conducting ring, and the inner ring wall of each radial magnetic conducting ring is provided with a first magnetic steel ring arranged concentrically; the rotor comprises a thrust part and shaft end sections on the axial two sides of the thrust part, and each shaft end section is respectively inserted into the through hole of the first magnetic steel ring. The first magnetic steel ring is arranged at the position of the two end faces of the thrust part of the rotor, and the first magnetic steel ring can improve the magnetic field intensity in the axial air gap between the radial magnetic conducting ring and the thrust part, thereby improving the axial support stiffness of the magnetic suspension bearing and further improving the axial load of the magnetic suspension bearing.