116 results about "Magnetic barrier" patented technology

The invention provides a rotor iron core, a permanent magnet motor and an inverter compressor, and relates to the technical field of motor and compressor design and manufacture, the rotor iron core comprises uniformly distributed permanent magnet grooves, a groove is arranged between two adjacent permanent magnet grooves, each groove extends inwards along the radial direction of the rotor iron core, parallel magnetic bridges are arranged between the grooves and the permanent magnet grooves, and the permanent magnet grooves are connected with the parallel magnetic bridges. A first magnetic barrier groove, a second magnetic barrier groove and a third magnetic barrier groove which are symmetrically distributed are formed in the two sides of the top of each permanent magnet groove respectively, a first arc and a second arc are arranged on the outer side of the rotor core above the magnetic barrier grooves, the second arc intersects with the side edge of the groove, and permanent magnets with alternating magnetism are embedded in the permanent magnet grooves. The radius Rr of the outer side of the rotor iron core, the distance ho from the middle point of the bottom of the permanent magnet groove to the center point of the rotor iron core and the thickness hm of the permanent magnet meet the condition that (Rr-ho) / hm is larger than 2 and smaller than or equal to 3.4. By reasonably arranging the position and the size of the magnetic barrier groove, magnetic circuit distribution can be changed, magnetic flux leakage can be reduced, the power density of the motor can be increased, and electromagnetic vibration noise of the motor and the compressor can be reduced.

The invention provides a rotor punching sheet, a rotor iron core, a rotor, a motor and an air conditioner, the rotor punching sheet is provided with more than two magnetic pole forming areas corresponding to rotor magnetic poles, and each magnetic pole forming area is internally provided with a magnetic steel groove which is arranged on a q axis and extends along the radial direction; the rotor punching sheet is provided with a first magnetic barrier groove located on the d axis between every two adjacent magnetic steel grooves. Wherein first magnetic bridges are formed between the first magnetic barrier grooves and the adjacent magnetic steel grooves on the two sides, and the width of each first magnetic bridge is gradually increased in the radial outward direction of the rotor punching sheet. According to the technical scheme of the invention, the magnetic lines of force can be gradually drawn close to the d axis from the two sides of the d axis, and the sinusoidal property of the magnetic flux in the air gap is better, so that the torque pulsation of the tangential motor can be reduced.

The invention discloses a rotor and a synchronous reluctance motor with the same. In the invention, the rotor has an even number of magnetic barrier structures, each magnetic barrier structure comprises a plurality of arc-shaped magnetic barrier layers, the plurality of arc-shaped magnetic barrier layers of each magnetic barrier structure have the same symmetry axis, each arc-shaped magnetic barrier layer comprises five sections of magnetic barriers, two sections of outermost magnetic barriers are mutually symmetrical about the symmetry axis, and two sections of middle magnetic barriers are mutually symmetrical about the symmetry axis. A section of the innermost magnetic barrier is symmetrical about the symmetry axis, so that the reluctance torque of the motor can be fully utilized to improve the output performance of the motor by means of the design of the multiple layers of magnetic barriers with the same symmetry axis. In addition, the two outermost magnetic barriers are not filled with magnetic substances, so that the magnetic substances are far away from the stator winding to reduce the risk of demagnetization of the magnetic substances.

The invention discloses a hybrid magnetic barrier design method for improving the average torque of a permanent magnet generator, the motor type is a double permanent magnet vernier motor, a stator and a rotor are provided with permanent magnets, the stator is wound with an armature winding, and an air gap magnetic field is composed of a stator permanent magnet magnetic field, a rotor permanent magnet magnetic field and an armature magnetic field. The average torque is derived from the interaction of an armature magnetic field and stator and rotor permanent magnetic fields. The stator is composed of six E-shaped module units in space, non-air-gap magnetic barriers exist between the module units, air-gap magnetic barriers are added to the two sides of a permanent magnet of the stator and the two sides of a permanent magnet of the rotor respectively, and the average torque is improved by improving the working wave content of an armature magnetic field and the working wave content of a permanent magnet magnetic field through the two types of magnetic barrier structures respectively. The hybrid magnetic barrier is simple in structure, the average torque of the permanent magnet vernier motor can be improved by more than 30%, and meanwhile, the sine property of no-load back electromotive force is improved.

The application discloses a minimum direct-axis flux linkage approximation type permanent-magnet flat wire driving motor and a design method thereof. Eight permanent-magnet groups and eight irregular rectangular magnetic barriers are uniformly arranged on the rotor in the circumferential direction. Each permanent-magnet group is symmetric along the d-axis, and each irregular rectangular magnetic barrier is symmetric along the q-axis. Each permanent-magnet group on the radial cross section is composed of two outer layer permanent magnets and one inner layer permanent magnet. The inner layer permanent magnet is perpendicular to the d-axis. An L-shaped magnetic barrier is arranged between the end of the outer layer permanent magnet on the same side of the d-axis and away from the d-axis and the end of the inner layer permanent magnet. The leakage magnetic component is introduced into the direct-axis flux linkage. The direct-axis flux linkage amplitude is calculated based on the direct-axis flux linkage. The key structure parameters and ranges are determined according to the direct-axis flux linkage amplitude. The key structure parameters are optimized by selecting typical working condition representative points. The optimal key structure parameters are obtained according to the minimum direct-axis flux linkage amplitude approximation 0. The widening of the constant power speed regulation range is realized. The multi-target requirements under different working conditions are met.

The application discloses an armature enhanced modular stator vernier permanent magnet motor, belongs to the motor field, and applies a stator magnetic barrier to the vernier permanent magnet motor as a modulation unit of an armature winding, breaks the original understanding of the magnetic barrier through a physical concept, and the stator magnetic barrier can enhance the cross-linking capacity of the armature winding to an excitation magnetic field, simultaneously enhances the magnetic motive force of multiple working armatures of the vernier permanent magnet motor, and thus increases the torque density of the motor; and a split tooth structure is adopted for the first stator tooth, the end length of the winding is shortened, and the motor volume is reduced; in addition, the magnetic barrier shape with the air gap side width being greater than the non-air gap side width can increase the first stator slot area without influencing the air gap structure, more windings are placed, and the torque density of the motor is further improved.

The invention discloses an axial flux permanent magnet synchronous reluctance motor rotor based on modular harmonic counteracting, the rotor is designed in a three-in-one mode of structure modularization, magnetic barrier gradient and phase computable dislocation, a rotor assembly is formed by splicing N fan-shaped rotor modules along the circumference, and the adjacent modules are provided with optimal dislocation angles calculated according to the harmonic counteracting principle. The sum of target harmonic magnetic field vectors generated by each module is zero; a U-shaped magnetic barrier array of which geometric parameters are monotonically changed in a gradient manner is arranged in the fan-shaped rotor module, and a permanent magnet group is embedded in the fan-shaped rotor module; main electromagnetic harmonic waves are offset from the source, magnetism gathering and resistance increasing functions are decoupled, the mechanical robustness and the electromagnetic performance of the motor are improved, meanwhile, overall machining is converted into standardized module assembling, the manufacturing cost and the maintenance difficulty are reduced, different motor pole numbers can be flexibly adapted, and the service life of the motor is prolonged. The method is suitable for high-end application scenes such as new energy automobiles, industrial driving and aerospace.

The invention provides a rotor structure and a motor, magnet grooves comprise two first magnet grooves and two second magnet grooves which are communicated with each other, the two second magnet grooves are located between the two first magnet grooves, and two sides of a D shaft of a magnetic pole are respectively provided with one first magnet groove and one second magnet groove; a first V-shaped groove with an opening deviating from the central point of the rotor core is formed between the two second magnet grooves, and a second V-shaped groove with an opening facing the central point of the rotor core is formed between the adjacent first magnet groove and the second magnet groove; wherein a plurality of magnetic barrier holes are formed between the first V-shaped grooves and the outer peripheral wall of the rotor core, and a plurality of auxiliary grooves are formed in the outer peripheral wall, corresponding to the second V-shaped grooves, of the rotor core; while the high salient pole ratio is ensured, the cogging torque is reduced, magnetic flux leakage and higher harmonics are inhibited, and meanwhile, the power density and efficiency of the motor are not influenced.

The utility model relates to a motor base structure with low eddy current loss, which comprises a cast iron base, a plurality of notches are uniformly distributed on an inner cylinder of the cast iron base, an aluminum magnetic isolation strip is mounted in each notch in a matched manner, and a single aluminum magnetic isolation strip is flat and completely attached to the notch; a driving end machine cover mounting lug, a lead wire lapping area, an iron core area, a fan area and a non-driving end machine cover mounting lug are sequentially arranged on the cast iron machine base in the axial direction, the aluminum magnetic isolation strip is mounted in the iron core area, and mounting ground feet are arranged at the bottom of the cast iron machine base. The motor base is compact and reasonable in structure and convenient to operate, the problem that the cast iron base generates a large amount of eddy current loss in a high-frequency alternating magnetic field can be effectively solved through the design that the magnetic strips are arranged in the cast iron base, meanwhile, the heat dissipation problem of the base can be met, and the working reliability of the whole motor base is greatly improved.

The utility model relates to a synchronous reluctance motor, which comprises a stator core and a rotor core, the stator core is sleeved on the periphery of the rotor core, a gap is reserved between the stator core and the rotor core, a plurality of stator tooth grooves are uniformly arranged on the surface of the stator core along the circumferential direction, windings are arranged in the stator tooth grooves, and ferrite is embedded in magnetic barrier grooves. A plurality of second through grooves are evenly distributed along the circumference of the rotor core, one side of each second through groove is communicated with the corresponding magnetic barrier groove, the other side of each second through groove penetrates to the outer side of the rotor core, a plurality of first through grooves penetrating through the inner side and the outer side of the stator core are formed in the stator core, and connecting grooves are communicated between the stator tooth grooves and the first through grooves. The outer side of the rotor core is uniformly connected with a plurality of fan blades along the circumferential direction of the rotor core. According to the utility model, heat generated during operation of the rotor and the stator can be effectively dissipated, and the aging process of each part of the motor is prevented from being accelerated due to a high-temperature environment generated during continuous operation, so that the service life of the whole system is prolonged.

The invention discloses a rotor assembly, a motor and electric equipment, and relates to the technical field of permanent magnet motors, the rotor assembly comprises a rotor core and a permanent magnet assembly, the rotor core is provided with a magnetic barrier structure, the permanent magnet assembly is arranged on the rotor core, the permanent magnet assembly comprises first permanent magnets and second permanent magnets, and the second permanent magnets are located between two adjacent first permanent magnets; the magnetic barrier structure is located between two adjacent first permanent magnets and is located on one side, facing the edge of the rotor core, of the second permanent magnet. The invention aims to inhibit the quadrature-axis armature reaction through the rotor assembly and improve the motor performance.

The invention discloses a dual three-phase asymmetric Halbach array permanent magnet fault-tolerant motor, and belongs to the field of permanent magnet motor design. The stator comprises a stator core, double three-phase centralized windings, armature teeth and fault-tolerant teeth. The rotor comprises a rotor iron core, asymmetric Halbach array permanent magnets and magnetic barriers, the semi-open magnetic barriers with openings facing the air gap side are arranged on the outer circumference of the rotor iron core, and the asymmetric Halbach array permanent magnets are arranged on the iron core in the circumferential direction. The tangential magnetized short permanent magnet is arranged in the magnetic barrier semi-open slot, and the tangential magnetized long permanent magnet extends to the bottom of the magnetic barrier from the magnetic barrier semi-open slot and is partially embedded in the magnetic barrier in the form; and two adjacent magnetic barriers are isolated by a magnetic isolation bridge. The leakage flux path is subjected to shunting regulation and control, so that the end leakage flux of the permanent magnet is reduced, and the effective flux utilization rate and the torque density of the air gap are improved; according to the invention, high torque density and low magnetic flux leakage are considered, the continuous output capability of the motor under a single-phase / multi-phase fault condition is enhanced, and a driving scene with a high reliability requirement is satisfied.

This invention discloses a magnetically decoupled permanent magnet motor with axial active and radial passive levitation, belonging to the field of magnetic levitation motor technology. The magnetic levitation motor includes an axial stator disk assembly, an axial stator sleeve, and a motor unit. The motor unit has a radial air gap, and an axial air gap exists between the motor unit and the axial stator sleeve. The axial air gap contains axial bias flux and axial control flux, while the radial air gap contains torque flux. The rotor's axial translational degree of freedom is actively controlled, while the four radial degrees of freedom are passively stabilized. The axial levitation force and torque are naturally decoupled and independently controlled. The rotor in the motor unit of this invention adopts a "V"-shaped alternating pole structure with built-in permanent magnets, and the rotor core has air magnetic barriers, which improves the utilization rate of permanent magnet materials and the motor's torque output capability, while reducing costs.

The invention discloses a reluctance rotor design method based on a streamline magnetic barrier and a motor, and belongs to the field of synchronous reluctance motors, a reluctance rotor comprises a magnetic barrier main body, a low-magnetic-conductance tail part and a separated magnetic island, and the design method comprises the following steps: drawing the streamline magnetic barrier main body according to the direction of a magnetic line of force of a d-axis magnetic field by taking increase of d-axis inductance and reduction of q-axis inductance as targets; in order to reduce the magnetic flux leakage of the rotor and reduce the influence on a d-axis magnetic circuit at the same time, the tail part of the magnetic barrier is subjected to narrow opening design, and the endpoint of the magnetic barrier main body and the endpoint of the magnetic barrier tail part are connected through a straight line or an arc to form a low-magnetic-permeability magnetic barrier tail curve; taking all design parameters of the rotor as optimization variables, selecting proper optimization targets and constraint conditions, establishing an optimization problem, and solving the optimization problem to obtain optimal design parameters; and selecting a new material or process mode to realize the integrity of the rotor, and completing the design of the reluctance motor based on the streamline magnetic barrier. According to the invention, the dq-axis reluctance difference can be increased, the salient pole ratio is improved, and the torque output capability of the synchronous reluctance motor is improved.

The application relates to a brushless synchronous motor rotor with built-in distributed magnetic barriers, which comprises a rotor core, an excitation winding and a damping winding, the rotor core is provided with a plurality of magnetic poles, the magnetic poles comprise pole bodies and pole shoes, the pole shoe surfaces are provided with damping grooves, the excitation winding is wound on the pole bodies, and the damping winding is arranged in the damping grooves; the rotor core pole shoes are provided with rotor magnetic barriers, the rotor magnetic barriers comprise cross-axis magnetic barriers and direct-axis magnetic barriers, the cross-axis magnetic barriers are arranged along the radial direction of the rotor core and are connected with the damping grooves, and the direct-axis magnetic barriers are arranged on both sides of the pole shoes. The application is innovative in that the distributed magnetic barriers are arranged in the brushless synchronous motor rotor for the first time to improve the output power quality. The basic principle is that by arranging the magnetic barriers at key positions of the rotor, the cross-axis and direct-axis magnetic resistances are increased, the negative sequence reactance is reduced, the generator anti-unbalanced load capacity is improved under the unbalanced load working condition, and the total harmonic content of the generator output voltage is reduced under the balanced load working condition. Since the magnetic barrier medium density is smaller than the core material density, the weight of the generator with the built-in rotor magnetic barriers is reduced, and the power density is increased.

The invention provides a rotor structure and a motor. The rotor structure comprises a rotor core (2) and permanent magnets (6), magnetic barrier layers (1) and magnetic steel grooves (5) are arranged on the rotor core (2), the multiple magnetic barrier layers (1) are arranged at intervals in the d-axis direction, each magnetic barrier layer (1) comprises an air groove (4) and a filling groove (7), each filling groove (7) comprises q-axis filling grooves (71) located on the two sides of the corresponding air groove (4), and the magnetic steel grooves (5) are located on the radial outer sides of the magnetic barrier layers (1) in the d-axis direction. The permanent magnets (6) are arranged in the magnetic steel grooves (5), under one pole, the radial center line of each permanent magnet (6) forms an offset angle delta relative to the d axis, and delta is larger than or equal to 2 degrees and smaller than or equal to 8 degrees. According to the rotor structure, the utilization rate of the permanent magnets can be improved, the electromagnetic torque and the reluctance torque are improved, and the output capacity of the motor is improved.

The application discloses a rotor structure of an asynchronous starting non-uniform magnetic barrier double-speed variable-pole permanent magnet motor and a reverse design method thereof, and first, air gap permeance design based on a magnetic resistance torque component and air gap flux density design based on a permanent magnet torque component are completed, and then, synthesis optimization design of non-uniform magnetic barriers and permanent magnets is completed based on the air gap permeance and the air gap flux density; based on the design method, the rotor structure is obtained as follows: the permanent magnets are built-in the rotor core, two adjacent permanent magnets are separated by a magnetic barrier, and the span of different magnetic barriers is set so that the magnetic barriers are asymmetrically distributed. Based on the modulation effect of the rotor structure on the air gap magnetic field, the pole pair number of working harmonics in the air gap magnetic field is selected by using the stator winding, and variable-pole variable-speed operation of the motor is realized; and the amount of the permanent magnets is low, and the material cost of the motor is greatly reduced.

The invention provides a permanent magnet synchronous motor for flywheel energy storage, and belongs to the technical field of motor rotor structures. The stator sleeves the rotor, and an air gap is arranged between the stator and the rotor. The rotor fixedly sleeves the rotating shaft. The rotor comprises a rotor iron core, a permanent magnet group, a magnetic bridge, a magnetic barrier group and a magnetic barrier isolation group; the rotor iron core is coaxially assembled on the inner side of the stator iron core, an air gap is formed between the rotor iron core and the stator iron core, the permanent magnet sets are arranged in the rotor iron core, located at the axis position of a rotor straight shaft and connected with the magnetic barrier sets, magnetic bridges are arranged between adjacent magnetic barriers in the magnetic barrier sets, and the multiple magnetic barrier sets are all arranged on the edge of the rotor iron core. And two adjacent magnetic barrier groups are symmetrically arranged on the two sides of the axis of the rotor straight shaft. The magnetic field sinusoidal property can be improved, the iron core loss is reduced, the temperature rise of the motor is reduced, the direct-axis inductance of the motor is larger than the quadrature-axis inductance, the counter electromotive force of the motor is small during no-load, and the corresponding no-load loss is low; and the stable terminal voltage is maintained by adjusting the armature current during loading.

The utility model discloses a motor rotor and a motor, and belongs to the technical field of motors. The motor rotor comprises a rotor core, a plurality of permanent magnets, a plurality of magnetic barriers and a plurality of first magnetic isolation bridges. Wherein the rotor core is provided with a first arc-shaped mounting groove, a permanent magnet is accommodated in a first sub-groove in the first arc-shaped mounting groove, magnetic barriers are accommodated in a second sub-groove and a third sub-groove, and the magnetic barriers are arranged at the two ends of the permanent magnet, so that the demagnetization resistance of the motor can be enhanced; moreover, two first magnetic isolation bridges can be arranged in each first arc-shaped mounting groove and are used for enhancing the mechanical strength of the motor rotor and reducing the vibration and deformation of the motor rotor during high-speed operation, and meanwhile, the two first magnetic isolation bridges are arranged at the two ends of the permanent magnets, so that the number of the permanent magnets in the motor rotor can be reduced, and the service life of the motor rotor is prolonged. The assembling steps of the motor rotor are simplified, and the breaking failure rate and the installation cost in the assembling process of the permanent magnet are reduced.

The application discloses a kind of high-efficiency magnetic power device for large-tonnage loader and design method thereof, the stator lamination of the stator is provided with at least 60 stator slots uniformly distributed in the circumferential direction, and the corresponding motor slot number;The magnetic power device is a three-phase motor;The rotor adopts 10-pole permanent magnet rotor structure, the armature winding adopts double-layer lap winding structure, the pole pitch τ of the motor is set to 6, short-pitch winding is used, the rotor lamination of the rotor adopts V-shaped magnetic steel topology structure, each pole corresponds a group of V-shaped arrangement of embedded permanent magnet, and the opening of V-shaped arrangement of permanent magnet faces the annular air gap side, the tip of V-shaped arrangement of permanent magnet faces the rotating axis of the rotor, and the magnetic barrier structure is formed between the two permanent magnets of the same pole.The application significantly reduces the motor load copper loss, and finally realizes the highest operating efficiency of the motor reaches 98%, adapts to the working condition of large-tonnage loader.

The invention relates to the technical field of rotating motor remanufacturing and performance upgrading, and discloses a three-phase asynchronous motor rotor permanent magnetization transformation method, which comprises the following steps: firstly, obtaining a clean silicon steel sheet laminated substrate through induction heating, melting, cage removal and ultrasonic cleaning; cutting a reverse inverted conical air magnetic barrier slit and a communicated pressure balance micro-channel by taking the original slot position as a reference line; a permanent magnet is assembled, and a double-source prestress medium containing latent expansion filler is prepared; and finally, through vacuum pressure impregnation, the medium compactly fills the deep slit through the micro-channel, and the zero stress state is locked through step curing. According to the invention, the high-speed centrifugal tensile stress is effectively counteracted through the synergistic effect of a double-source prestress mechanism generated by reverse back taper mechanical self-locking and medium limited expansion, compact filling of the medium in a complex slot and active enhancement of a magnetic conductive steel bridge are realized, and the problems of insufficient rotor strength and air gap defects are solved.

This invention provides a rotor core, a permanent magnet motor, and a variable frequency compressor, relating to the field of motor and compressor design and manufacturing technology. The rotor core includes uniformly distributed permanent magnet slots, with grooves between adjacent slots. Each groove extends inward along the radial direction of the rotor core, and a parallel magnetic bridge is provided between the groove and the slot. Symmetrically distributed first, second, and third magnetic barrier slots are provided on both sides of the top of each slot. The outer side of the rotor core above the magnetic barrier slots includes a first and second circular arc, with the second arc intersecting the side of the groove. Permanent magnets with alternating magnetic properties are embedded in each slot. In this invention, the outer radius Rr of the rotor core, the distance ho from the midpoint of the bottom of the permanent magnet slot to the center point of the rotor core, and the thickness hm of the permanent magnet satisfy 2 < (Rr - ho) / hm ≤ 3.4. Furthermore, by reasonably setting the position and size of the magnetic barrier slots, the magnetic circuit distribution can be changed, leakage flux reduced, the power density of the motor increased, and the electromagnetic vibration noise of the motor and compressor reduced.

The embodiment of the application provides a non-symmetrical magnetic pole variable magnetic flux variable inductance inverse salient pole permanent magnet motor, and belongs to the field of motors.The non-symmetrical magnetic pole variable magnetic flux variable inductance inverse salient pole permanent magnet motor comprises a stator structure and a non-symmetrical magnetic pole rotor placed in sequence from outside to inside, wherein the non-symmetrical magnetic pole rotor comprises a variable magnetic flux magnetic pole and a variable inductance magnetic pole, the variable magnetic flux magnetic pole is composed of two symmetrical eight-shaped permanent magnets and double-layer magnetic leakage barriers, and a magnetic isolation barrier is arranged in the middle; the variable inductance magnetic pole is composed of multiple layers of parallel permanent magnets and magnetic barriers at both ends of the permanent magnets.The application changes the corresponding relationship between the rotor direct and quadrature axes and the stator armature direct and quadrature axes by arranging the quadrature axis wide magnetic barrier, realizes the inverse salient pole rate characteristics, and realizes the utilization of reluctance torque under the positive direct axis current, in addition, the introduction of the variable magnetic flux magnetic pole reduces the required field weakening current at high speed, and realizes the adjustment of the permanent magnet air gap magnetic field.

This application discloses a motor, a compressor and a cooling device, the motor including a rotor, the rotor having 2P mounting grooves, the 2P mounting grooves spaced apart along the circumferential direction of the rotor, permanent magnets mounted in the mounting grooves, both ends of the mounting grooves having magnetic barrier regions that extend beyond both ends of the permanent magnets, recessed structures provided at intermediate positions on the outer edge of the rotor corresponding to two adjacent mounting grooves, magnetic shielding bridges formed between the recessed structures and the magnetic barrier regions of the two corresponding mounting grooves, the angle between the connection line between each of the adjacent ends of the two recessed structures and the center of the rotor is θ, where θ ≥ 180° / (2P).

The invention discloses a rare-earth-free permanent magnet wind driven generator rotor and a generator with the same. The rare-earth-free permanent magnet wind driven generator rotor comprises a rotor iron core and a plurality of magnetic barrier assemblies embedded in the circumferential direction of the rotor iron core. The magnetic barrier assembly comprises a plurality of magnetic barrier units which are distributed at intervals in the radial direction of the rotor core, each magnetic barrier unit comprises two permanent magnet cavities which are symmetrically arranged about the radial center line of the rotor core, and the two permanent magnet cavities incline outwards in the direction away from the radial center line of the rotor core; and a rare-earth-free permanent magnet is arranged in each permanent magnet cavity. According to the invention, the inclined permanent magnet cavity enables the direct-axis magnetic circuit to form high magnetic resistance and the quadrature-axis magnetic circuit to form low magnetic resistance, and the salient pole rate and the reluctance torque ratio can be improved by cooperating with the radially spaced magnetic barrier units; meanwhile, the rotor yoke part with slightly low magnetic conductivity is adopted, so that a magnetic field can be prevented from leaking towards the rotating shaft, the magnetic field is forced to be transmitted towards an outer air gap direction, and magnetic leakage of the yoke part is reduced.

This invention discloses a wafer testing box. The wafer testing box includes a first housing, a second housing, and a magnetic barrier assembly. The first housing has a first magnetic element. The second housing has a second magnetic element, which is correspondingly disposed with the first magnetic element. When the first housing and the second housing are in contact, an accommodating space is formed between them. The magnetic barrier assembly is configured to connect to the first housing or the second housing to reduce or release the magnetic attraction force generated between the first magnetic element and the second magnetic element. Before the first housing and the second housing come into contact, the magnetic barrier assembly is used to reduce or release the magnetic attraction force. When the first housing and the second housing are in contact, the effect of the magnetic barrier assembly is released, so that the first housing and the second housing are tightly bonded by magnetic attraction force. The magnetic attraction force is reduced by the magnetic barrier assembly, so that the first housing and the second housing can be separated.

This invention discloses a permanent magnet motor rotor, formed by stacking a first circular lamination and a second circular lamination. This allows the harmonic distortions generated by the two types of laminations in the rotor core to compensate for each other. The first circular lamination has six evenly spaced first magnetic slots circumferentially. Triangular magnetic barrier short slots are provided at both ends near the outer periphery of the first circular lamination. The bottom edges of the two magnetic barrier short slots are equidistant from the tangents of the first circular lamination. The central angle between the intersection of the facing waist edges and the corresponding bottom edges of the two magnetic barrier short slots and the Q-axis is A1. The second circular lamination has six evenly spaced second magnetic slots circumferentially. Long magnetic barrier slots are provided at both ends near the outer periphery of the second circular lamination. The central angle between the wedge head of each long magnetic barrier slot and the Q'-axis is B1; central angle A1 is less than B1. This rotor enables the harmonic distortions of the two types of laminations to cancel each other out, significantly reducing the overall back electromotive force distortion rate, optimizing the overall sine of the magnetic field waveform, and achieving low-vibration and low-noise operation of the motor.

A U-shaped linear magnetic steel group built-in slot-increasing outer rotor permanent magnet auxiliary synchronous reluctance motor relates to the technical field of motors, the motor comprises an inner stator and an annular outer rotor, the outer rotor is internally provided with a plurality of permanent magnet units, and the permanent magnet units are symmetrically arranged around a rotating shaft of the outer rotor; each permanent magnet unit comprises two linear magnetic steels, the two linear magnetic steels are symmetrically arranged on the two sides of the d-axis and are arranged in a splayed shape with a narrow opening facing outwards, a middle magnetic barrier is arranged at the narrow opening part of the splayed shape, side magnetic barriers are arranged at the inner ends of the two linear magnetic steels, an elliptical pole shoe hole 24 is formed between the two linear magnetic steels, and the pole shoe hole 24 is arranged in the middle of the middle magnetic barrier. And the short axis of the pole shoe hole coincides with the d axis. According to the motor provided by the invention, the torque ripple can be reduced.

A stator of an electric machine has a plurality of stator teeth distributed over the circumference for receiving stator windings, in which recesses which are open to the axial end side and form magnetic barriers are introduced into at least one stator tooth, the recesses extending over an axial partial length of the stator tooth.