556results about "Magnetic bearings" patented technology

Disclosed in the present invention is a construction method for a control system for a high-speed electric spindle supported by six-pole active magnetic bearings. The method comprises: constructing a transfer learning model by means of a marginal distribution distance between a source domain data set and a target domain data set, training same to obtain a predicted disturbance function, and building the predicted disturbance function in a transfer learning module; using an actual displacement as an input of the transfer learning module so as to obtain a predicted disturbance, and forming an optimized active disturbance rejection controller by using a tracking differentiator, a nonlinear state error feedback control law, a first compensation factor, a second compensation factor, the transfer learning module and an extended state observer jointly; and three optimized active disturbance rejection controllers being connected in series to the front end of a three-degree-of-freedom compound controlled object, and two optimized active disturbance rejection controllers being connected in series to the front end of a two-degree-of-freedom compound controlled object, so as to jointly form a control system. Using active disturbance rejection control based on transfer learning optimization to predict a disturbance and using the optimized extended state observers to perform estimation and compensation for the total system disturbance improve the control performance of the system.

The invention discloses a three-degree-of-freedom permanent magnet biased magnetic bearing which comprises a rotor system, a radial magnetic bearing stator system and an axial magnetic bearing stator system. The rotor system comprises a rotor, a radial magnetizing permanent magnet ring and a magnetic conducting ring; the radial magnetic bearing stator system comprises a radial stator iron core, a magnetism isolating ring and a radial coil winding; the axial magnetic bearing stator system comprises a sheet-shaped arc-shaped radial magnetizing permanent magnet, an axial stator iron core and an axial coil winding; according to the three-degree-of-freedom permanent magnet biased magnetic bearing, the axial magnetic bearing stator surrounds the periphery of the rotor and is in the same plane with the radial magnetic bearing stator, so that the axial length of the magnetic bearing is reduced, and the structure is compact; radial two-degree-of-freedom translation control and axial translation control can be realized; magnetic isolation rings are additionally arranged among the radial stator iron cores, so that decoupling of a magnetic circuit controlled by two radial channels of an x axis and a y axis is realized; the two radial channels are biased by independent permanent magnets, so that the decoupling of a biased magnetic circuit is realized, and the influence of air gap magnetic resistance change is weakened; and the second air gap is arranged, so that the axial control magnetic circuit does not pass through the permanent magnet ring, and the power consumption of the magnetic bearing is further reduced.

The invention provides a magnetic suspension rotating machine. The magnetic suspension rotating machine comprises a magnetic suspension bearing and a motor stator and rotor. In the axial direction, the thrust disc is arranged between the first axial stator and the second axial stator, a first thrust disc ventilation hole is formed in the thrust disc in a penetrating mode from one axial end face to the other axial end face of the thrust disc, and the first axial stator comprises a first radial outer side part and a first radial inner side part. One end, positioned on the other axial end surface of the thrust disc, of each first thrust disc vent hole is positioned between the radial inner side part II of the axial stator II and the rotor, and the other end, positioned on the axial end surface of the thrust disc, of each first thrust disc vent hole is opposite to the position of the coil slot I in the axial direction; the first thrust disc vent hole is not opposite to the magnetic pole position of the first axial stator; and the motor stator and rotor runners are respectively communicated with the first thrust disc ventilation holes. According to the magnetic suspension bearing, heat dissipation and cooling of the magnetic suspension bearing are improved, meanwhile, the influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

The invention provides a magnetic suspension rotating machine. The magnetic suspension rotating machine comprises a magnetic suspension bearing, a motor stator and a rotor, in the axial direction, the thrust disc is arranged between the first axial stator and the second axial stator, a first thrust disc ventilation hole is formed in the thrust disc in a penetrating mode from one axial end face to the other axial end face of the thrust disc, and the first axial stator comprises a first radial outer side part and a first radial inner side part. One end, positioned on the other axial end surface of the thrust disc, of each first thrust disc vent hole is positioned between the radial inner side part II of the axial stator II and the rotor, and the other end, positioned on the axial end surface of the thrust disc, of each first thrust disc vent hole is opposite to the position of the coil slot I in the axial direction; the first thrust disc vent hole is not opposite to the magnetic pole position of the first axial stator; and the motor rotor flow channel and the first thrust disc ventilation hole are respectively communicated with the motor stator flow channel. According to the magnetic suspension bearing, heat dissipation and cooling of the magnetic suspension bearing are improved, meanwhile, the influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

The invention provides a magnetic suspension rotating machine which comprises a magnetic suspension bearing, a motor stator and a rotor. A rotor air inlet flow channel and a rotor air outlet flow channel are arranged in the rotor. In the axial direction, the thrust disc is arranged between the first axial stator and the second axial stator, a first thrust disc ventilation hole is formed in the thrust disc in a penetrating mode from one axial end face to the other axial end face of the thrust disc, and the first axial stator comprises a first radial outer side part and a first radial inner side part. One end, positioned on the other axial end surface of the thrust disc, of each first thrust disc vent hole is positioned between the radial inner side part II of the axial stator II and the rotor, and the other end, positioned on the axial end surface of the thrust disc, of each first thrust disc vent hole is opposite to the position of the coil slot I in the axial direction; and the first thrust disc vent hole is not opposite to the magnetic pole position of the first axial stator. According to the magnetic suspension bearing, heat dissipation and cooling of the magnetic suspension bearing are improved, meanwhile, the influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

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 provides a magnetic suspension rotating machine which comprises a barrel, a magnetic suspension bearing, a motor stator and a motor rotor, a barrel runner is formed in the barrel in the axial direction, and a motor rotor runner is formed in the rotor; in the axial direction, the thrust disc is arranged between the first axial stator and the second axial stator, a first thrust disc ventilation hole is formed in the thrust disc in a penetrating mode from one axial end face to the other axial end face of the thrust disc, and the first axial stator comprises a first radial outer side part and a first radial inner side part. One end, positioned on the other axial end surface of the thrust disc, of each first thrust disc vent hole is positioned between the radial inner side part II of the axial stator II and the rotor, and the other end, positioned on the axial end surface of the thrust disc, of each first thrust disc vent hole is opposite to the position of the coil slot I in the axial direction; and the first thrust disc vent hole is not opposite to the magnetic pole position of the first axial stator. According to the magnetic suspension bearing, heat dissipation and cooling of the magnetic suspension bearing are improved, meanwhile, the influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

The invention provides a magnetic fluid sealed hybrid magnetic bearing, which comprises a base, a magnetic bearing assembly, a displacement sensor and a protective bearing assembly, and is characterized in that 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 lamination and a rotor; the control coil is used for pulling the rotor back to the balance position when the rotor is not located at the balance position, a magnetofluid spiral groove is formed in the end of the rotor, magnetofluid is arranged between the magnetofluid spiral groove of the rotor and the magnetic conductive ring pole shoe, and the magnetofluid spiral groove is used for achieving rotating shaft dynamic sealing of the magnetofluid. The permanent magnet ring is used for providing an external constant magnetic field for the magnetic fluid and providing permanent magnet bias magnetic flux between the active control side stator and the radial magnetic bearing rotor lamination; and the magnetic conductive ring pole shoes are used as control pole shoes of the magnetic fluid and a permanent magnet bias magnetic circuit of the closed hybrid magnetic bearing. By means of the technical scheme, the technical problem that in the prior art, the axial length of a magnetofluid sealing magnetic bearing is too long is solved.

The invention discloses a modular five-degree-of-freedom magnetic suspension compressor rotor system and a control method, and belongs to the field of compressor rotors, the modular five-degree-of-freedom magnetic suspension compressor rotor system comprises a magnetic suspension rotor main shaft and a driving motor arranged in the middle of the magnetic suspension rotor main shaft, and a centrifugal impeller and a cooling impeller are installed at the two ends of the magnetic suspension rotor main shaft correspondingly; the magnetic suspension rotor main shaft between the driving motor and the centrifugal impeller and the magnetic suspension rotor main shaft between the driving motor and the cooling impeller are respectively and sequentially provided with an axial magnetic bearing assembly and a radial magnetic bearing assembly; the axial magnetic bearing assembly is of a non-thrust disc structure in which a magnetic field is directly coupled; the radial magnetic bearing assembly is of a modular structure with partitioned magnetic poles. According to the modularized five-degree-of-freedom magnetic suspension compressor rotor system and the control method, the axial magnetic bearing assembly directly coupled with the magnetic field is adopted, a thrust disc is omitted, the assembly process of the axial magnetic bearing is simplified, meanwhile, the partitioned magnetic poles are adopted, redundancy control is achieved, and stability is higher.

An axial active magnetic bearing includes a rotating shaft, a magnetic yoke, a permanent magnet, a magnetic barrier structure and an electromagnetic coil. The rotating shaft includes a main shaft and a thrust plate; first and second air gaps with a projected area size having an error smaller than 5% are formed between the magnetic yoke and the thrust plate; the permanent magnet is provided on the magnetic yoke, and a third air gap is formed between the thrust plate and the permanent magnet; a permanent magnet magnetic flux is formed between the permanent magnet and the magnetic yoke; the magnetic barrier structure is provided on the magnetic yoke and positioned in the path of the permanent magnet magnetic flux, the permanent magnet magnetic flux is passed through the barrier structure, the first air gap and the third air gap; the electromagnetic coil is provided in a magnetic yoke chamber.

The invention discloses an axial passive magnetic bearing with a dual damping effect and a design method thereof, and the axial passive magnetic bearing with the dual damping effect comprises a stator, a rotor, an eddy current damping conductor arranged on the stator, an eddy current damping permanent magnet arranged on the rotor, and a magnetic fluid arranged between the stator and the rotor. The design method comprises the steps that the numerical range of eddy current damping force is determined based on the set numerical range of equivalent damping coefficients and magnetofluid dynamic vibration absorption eddy current loss damping force; determining the thickness of the eddy-current damping conductor according to the relationship between the eddy-current damping force and multiple structure sizes of the eddy-current damping permanent magnet and the thickness of the eddy-current damping conductor, the numerical range of the eddy-current damping force and the size design requirement of the eddy-current damping permanent magnet; the structure of the axial passive magnetic bearing with double damping effects is designed according to the thickness of the eddy current damping conductor. Quantitative design of the axial passive magnetic bearing with double damping effects is achieved, and design precision is improved.

Provided in the present disclosure are a magnetic levitation compressor and an air conditioner. The magnetic levitation compressor comprises: a rotating shaft; and a magnetic levitation bearing which is sleeved on a radial outer side of the rotating shaft and is provided with a magnetically conductive shell, wherein an accommodating space configured to accommodate a magnetic bearing assembly is formed in the magnetically conductive shell; cooling inlets and cooling outlets are configured in the magnetically conductive shell; and the cooling inlets and the cooling outlets are all in communication with the accommodating space, so as to introduce a cooling medium into the accommodating space via the cooling inlets and then discharge the cooling medium via the cooling outlets. In the present disclosure, the cooling medium can be introduced into the magnetically conductive shell to come into full contact with the magnetic bearing assembly in the accommodating space, thereby efficiently cooling the interior of a magnetic bearing in a timely manner, and effectively reducing the temperature rise of the magnetic levitation bearing during operation. Compared with the prior art in which the cooling medium is introduced to an outside region of the magnetically conductive shell, the present disclosure has higher cooling efficiency and a better temperature rise control effect.

The invention discloses a radial two-degree-of-freedom hybrid magnetic bearing with external permanent magnets. The radial two-degree-of-freedom hybrid magnetic bearing comprises a stator and a rotor. The rotor comprises a rotor iron core, a rotating shaft, two rotor U-shaped grooves, two rotor magnetic isolation aluminum rings and two rotor permanent magnet rings, the stator comprises a stator iron core, a coil, two stator U-shaped grooves, two stator magnetic isolation aluminum rings and two stator permanent magnet rings, and the polarities of the stator and the rotor permanent magnet rings which are opposite up and down are opposite; the permanent magnet rings are respectively embedded into the corresponding U-shaped grooves and are arranged on two sides of the stator core and the rotor core through the magnetic isolation aluminum rings, eight magnetic poles are uniformly distributed in the stator core, eight coils are wound on the magnetic poles, the coils on two poles in the + X,-X, + Y and-Y directions are respectively and reversely connected in series to form suspension windings in the + X,-X, + Y and-Y directions, and then the suspension windings are driven by the four switch power amplifiers. The radial two-degree-of-freedom hybrid magnetic bearing provided by the invention has the advantages of no coupling of permanent magnetic flux and suspension magnetic flux, high suspension precision, low power consumption, easiness in processing and assembling and high suspension force density.

The invention provides a magnetic suspension rotating machine which comprises a cylinder body, a magnetic suspension bearing, a motor stator and a rotor, the cylinder body, the rotor and the stator are respectively provided with flow channels, in the axial direction, a thrust disc is arranged between a first axial stator and a second axial stator, and thrust disc ventilation holes are formed in the thrust disc from one axial end face to the other axial end face in a penetrating mode. The first axial stator comprises a first radial outer side part and a first radial inner side part, the first radial outer side part and the first radial inner side part are arranged at intervals in the radial direction of the first axial stator, and a first coil groove is formed between the first radial outer side part and the first radial inner side part. One end, located on one axial end face of the thrust disc, of the first thrust disc air inlet hole is opposite to the position of the first coil groove in the axial direction, and one end of the first thrust disc air inlet hole is not opposite to the magnetic pole position of the first axial stator. According to the magnetic suspension bearing, heat dissipation and cooling of the magnetic suspension bearing are improved, meanwhile, the influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

The axial self-balancing three-degree-of-freedom magnetic bearing is characterized in that a stator part comprises a stator yoke, a left attraction iron core, a right attraction iron core, a left repulsive iron core and a right repulsive iron core which are all mounted on an aluminum alloy bracket, and four poles wound with coils are uniformly distributed on the inner circumference of the stator yoke; an axial control winding is embedded in the attraction iron core, and a stator permanent magnet is embedded in the repulsive iron core. The rotor part comprises a rotor core and a rotating shaft, a radial air gap and an axial air gap are respectively arranged between the rotor core and the radial iron core, between the attraction iron core and the repulsive force iron core, rotor permanent magnets are arranged on two sides of the rotor core and at positions corresponding to the stator permanent magnets of the repulsive force iron core, and the polarities of the stator permanent magnets and the rotor permanent magnets facing the axial air gap are the same. The radial magnetic flux magnetic circuit, the axial control magnetic flux magnetic circuit and the permanent magnetic flux magnetic circuit are completely independent and free of coupling, axial static balance of the rotor is achieved, suspension is achieved in the radial direction, control is easy, and the controllable suspension force is large.

The invention provides a magnetic suspension rotating machine. The magnetic suspension rotating machine comprises a magnetic suspension bearing, a motor stator and a rotor, the thrust disc is arranged between the first axial stator and the second axial stator, thrust disc ventilation holes are formed in the thrust disc in a penetrating mode from one axial end face to the other axial end face of the thrust disc, the first axial stator comprises a first radial outer side portion and a first radial inner side portion, and the first radial outer side portion and the first radial inner side portion are arranged in the radial direction of the first axial stator in a spaced mode. A first coil groove is formed between the first thrust disc and the second thrust disc, a first coil is arranged in the first coil groove, one end, located on one axial end face of the thrust disc, of the first thrust disc air inlet hole is opposite to the first coil groove in the axial direction, and the motor rotor flow channel can be communicated with the first bearing stator ventilation hole and the motor stator flow channel. And one end of the air inlet hole of the first thrust disc is not opposite to the magnetic pole position of the first axial stator. According to the magnetic suspension bearing, heat dissipation and cooling of the magnetic suspension bearing are improved, meanwhile, the influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

The invention discloses a five-degree-of-freedom permanent magnet biased magnetic suspension blood pump which comprises a pump shell, a rotor impeller, a magnetic suspension bearing and a motor used for driving the rotor impeller to rotate and do work, the magnetic suspension bearing comprises a bearing stator and a bearing rotor, and the bearing stator is fixed in an inlet pipe; the stator comprises an annular stator core and stator magnetic rings distributed at the two axial ends of the stator core, a plurality of first stator teeth are arranged on the inner wall of the stator core in the radial direction, and each first stator tooth is wound with a first coil; the bearing rotor is fixed in the pump rotor, the bearing rotor comprises a rotor iron core, rotor teeth are arranged on the outer circumferential surface of the rotor iron core, and the multiple first stator teeth are arranged opposite to the rotor teeth in the radial direction; the stator magnetic rings located at the two axial ends of the stator iron core are magnetized in the axial direction, the magnetizing directions are opposite, and closed magnetic loops can be formed between the stator magnetic rings and the stator iron core and between the stator magnetic rings and the rotor iron core. Five-degree-of-freedom suspension control can be achieved, the size is small, and power consumption is low.

The invention discloses a motor magnetic bearing assembly calibration method and system, electronic equipment and a medium, and the method comprises the steps: building a correlation model between a control current and a motor three-phase current under a rotor rotating coordinate system during the calibration of a magnetic bearing; the rotation angle of the rotor is adjusted by changing the control current, the motor correspondingly adjusts the three-phase current according to the control current, and rotation operation on the rotor is executed; taking the initial position of the rotor in a rotating coordinate system as a 0-degree position, sequentially controlling the rotor to rotate for a circle according to 45-degree intervals, controlling the rotor to suspend to a balance position through a magnetic bearing controller at the 0-degree position and after each rotation, and calibrating the magnetic bearing at each angle, according to the invention, the control strategy of the motor to the rotation of the rotor can be simplified, the position of the rotor can be accurately controlled, manual participation is reduced, the operation time is saved, and the efficiency and accuracy of multi-angle calibration are greatly improved.

The invention relates to the technical field of flywheel energy storage, in particular to a stability control method for a magnetic suspension flywheel energy storage system with time delay feedback. Determining axial bearing capacity and radial bearing capacity demand parameters of the flywheel energy storage device based on gravity and impact load of the flywheel rotor and centrifugal force and unbalanced force generated during high-speed rotation; according to the bearing capacity demand parameters, U-shaped stator structure design is carried out on the axial electromagnetic bearing, an inner ring and outer ring magnetic pole equal-area structure is adopted, the axial electromagnetic bearing is made of electrical pure iron, octupole electromagnetic bearing design is carried out on the radial electromagnetic bearing, and a stator and a rotor are made of silicon steel sheets formed through pressing; and carrying out temperature field distribution simulation analysis on the axial electromagnetic bearing and the radial electromagnetic bearing by adopting a bidirectional coupling mode of an electromagnetic field and a temperature field. The method further comprises the steps that an auxiliary bearing protection system is arranged, differential working mode control is adopted, and dynamic adjustment of the bearing capacity of the electromagnetic bearing under different working conditions is achieved by adjusting bias current and control current.

The present invention provides a vacuum pump (1), preferably a turbomolecular pump, comprising a rotor shaft (9) configured to have one or more rotor blades (8) coupled thereto and the rotor shaft (9) defining a bearing well (7) containing, in an interference-fit configuration, a permanent magnetic bearing, wherein the magnetic bearing insert comprises one or more permanent magnet alloy rings (3,4,5) of a rotor bearing half of a permanent magnetic bearing and a radially outwardly extending sleeve (16) coupled thereto around an outer circumference of the or each said permanent magnet alloy ring (3,4,5), and an outer surface of the permanent magnetic bearing insert (3) engages with an inward facing wall of the bearing well (7) to provide an interference fit, wherein the radially outwardly extending sleeve (16) has a coefficient of thermal expansion that is at least substantially the same as the coefficient of thermal expansion of the material of the rotor shaft (9) defining the engaged bearing well wall.

The invention discloses a magnetic suspension flywheel energy storage device which comprises a shell, a flywheel disc rotor assembly, a permanent magnet synchronous motor assembly, a radial magnetic suspension bearing system, an axial magnetic suspension bearing system and a vacuum operation system. The motor rotor is arranged on the flywheel disc rotor assembly; the radial magnetic suspension bearing system and the axial magnetic suspension bearing system are used for supporting the flywheel disc rotor assembly; the vacuum operation system is used for vacuumizing the inner cavity of the shell; and the cooling system is used for cooling the motor stator. When the permanent magnet synchronous motor assembly drives the flywheel disc rotor assembly to operate, the flywheel disc rotor assembly is in a suspension state, meanwhile, friction damage of the flywheel disc rotor assembly during operation can be reduced through the vacuum environment, and the energy storage efficiency can be effectively improved. The cooling system is used for cooling the motor stator with high heat productivity, so that stable operation of the motor stator can be effectively guaranteed, and reliable operation of the energy storage device is further guaranteed.

A magnetic bearing assembly having a signal conditioning circuit that includes an offset generator for adding a digitally controllable analog offset to compensate for displacement error in unbalanced inductive sensors.

The invention provides a magnetic suspension rotating machine which comprises a magnetic suspension bearing, a motor stator and a rotor, a motor stator runner is formed in the motor stator, and a motor rotor runner is also formed in the rotor; in the axial direction, the thrust disc is arranged between the first axial stator and the second axial stator, the first axial stator comprises a first radial outer side part and a first radial inner side part, the first radial outer side part and the first radial inner side part are arranged at intervals in the radial direction of the first axial stator, a first coil groove is formed between the first radial outer side part and the first radial inner side part, and a first coil is arranged in the first coil groove. A thrust disc ventilation hole is formed in the thrust disc from one axial end face to the other axial end face in a penetrating mode, the thrust disc ventilation hole is not opposite to the magnetic pole position of the first axial stator, and / or the thrust disc ventilation hole is not opposite to the magnetic pole position of the second axial stator. According to the magnetic suspension bearing, heat dissipation and cooling of the magnetic suspension bearing are improved, meanwhile, the influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

The invention discloses a double-sliding-table linear module and a control method, and the double-sliding-table linear module comprises a base which is provided with an electromagnetic coil group on the inner surface; permanent magnet arrays are fixed at the bottoms of the first sliding table and the second sliding table, and the first sliding table and the second sliding table suspend above the base through electromagnetic force; the two ends of the elastic linkage rod are hinged to the two sliding tables through universal joints, and a piezoelectric ceramic sensor is arranged in the rod; the piezoelectric actuators are embedded into the four corners of the base and used for generating reverse damping waves to suppress vibration; and the vibration accelerometer is installed at the center of the sliding table, the FFT analysis module and the damping wave generation module are connected, and the damping wave generation module outputs a reverse phase signal to the piezoelectric actuator. According to the invention, the electromagnetic coil group and the permanent magnet array interact to generate suspension force, so that the sliding table is suspended on the base; the piezoelectric sensor detects deformation and triggers compensation; the piezoelectric actuator generates reverse mechanical waves to counteract vibration energy so as to construct a non-contact driving double-sliding-table infrastructure, friction is eliminated through magnetic suspension, and the elastic linkage rod reduces the cooperation error.

The invention provides a magnetic suspension bearing and a magnetic suspension rotating machine.The magnetic suspension bearing comprises a first axial stator, a second axial stator and a thrust disc, the thrust disc is arranged between the first axial stator and the second axial stator in the axial direction of the magnetic suspension bearing, and the first axial stator comprises a first radial outer side part and a first radial inner side part; the first radial outer side portion and the first radial inner side portion are arranged at intervals in the radial direction of the first axial stator, a first coil groove is formed between the first radial outer side portion and the first radial inner side portion, and a first coil is arranged in the first coil groove. And the thrust disc ventilation holes are not opposite to the magnetic pole position of the first axial stator, and / or the thrust disc ventilation holes are not opposite to the magnetic pole position of the second axial stator. According to the magnetic suspension bearing, heat dissipation and cooling of the magnetic suspension bearing are improved, meanwhile, the influence on a magnetic suspension magnetic circuit can be avoided, and enough magnetic suspension supporting force is guaranteed.

Disclosed are a magnetic bearing and a compressor. The magnetic bearing comprises a first axial iron core and a radial iron core, wherein the first axial iron core has a first accommodating space, in which an annular positioning boss is arranged; the annular positioning boss has an axial positioning surface and a radial positioning surface; and a magnetic conductive ring is arranged in the first accommodating space, the magnetic conductive ring can be connected to both the axial positioning surface and the radial positioning surface in a fitting manner to achieve positioning of the magnetic conductive ring in both an axial direction and a radial direction of the first axial iron core, and the magnetic conductive ring is sleeved on an outer circumferential wall of the radial iron core. In the magnetic bearing and the compressor, the positioning of the radial iron core is more accurate, so as to effectively avoid the problem of great positioning accuracy error of a radial iron core in the prior art due to association of the positioning with magnetic steel.

A hybrid bearing assembly is provided and includes stationary components, a shaft disposed to rotate relative to the stationary components, passive magnetic bearing components integrated into the shaft and the stationary components to generate passive magnetic force to resist radial movement of the shaft relative to the stationary components and an active damping system. The active damping system includes a stationary coil, a magnetic element rotatable with the shaft to induce current in the stationary coil and a circuit electrically coupled with the stationary coil. The circuit is configured to determine from the current an attitude change of the shaft and the magnetic element and to apply damping current to the stationary coil to resist the attitude change.

The invention provides a midpoint potential balancing system based on a multi-level magnetic suspension bearing driver, and belongs to the technical field of magnetic suspension bearing control, and the system comprises a three-level four-bridge-arm driver which comprises a switch bridge arm module and a capacitor bridge arm module which are connected in parallel and is used for obtaining winding current data, the neutral-point voltage balancing module is in communication connection with the current controller and is used for adjusting the voltage of the switch bridge arm module based on the voltage control signal so as to balance the neutral-point potential of the capacitor bridge arm module, and the neutral-point voltage balancing module is in communication connection with the current controller and is used for balancing the neutral-point potential of the capacitor bridge arm module based on the average voltage of the switch bridge arm module. The neutral-point voltage balancing module is used for balancing the neutral-point voltage to obtain zero-sequence voltage, the duty ratio updating module is in communication connection with the neutral-point voltage balancing module and is used for obtaining switching time based on the zero-sequence voltage and average voltage of the switching bridge arm module, and the modulation module is in communication connection with the duty ratio updating module and is used for receiving the switching time and obtaining a voltage control signal based on the switching time.