66results about How to "Cut end effect" patented technology

The invention discloses a mixed permanent magnetic pole-alternating and magnetic flux-switching memory motor and a winding switching magnetism-weakening control method thereof. The mixed permanent magnetic pole-alternating and magnetic flux-switching memory motor comprises a salient rotor and a stator, wherein the stator contains stator cores, aluminium-nickel-cobalt permanent magnets, neodymium-iron-boron permanent magnets, centralized armature windings and pulsed magnetism-adjusting windings; iron core edges of two adjacent outer U-shaped units and tangentially-magnetized long-stripped neodymium-iron-boron permanent magnets form a first permanent magnetic pole, while the circumferentially-inward (outward) and parallel-magnetized V-shaped embedded aluminium-nickel-cobalt permanent magnets and inner U-shaped units form a second permanent magnetic pole; mixed magnetic poles are in alternating polarity distribution; when the motor runs at a low speed, the pulsed magnetism-adjusting windings are in direct-current pulsed working state, while in a high-speed weak-magnetism area, the pulsed magnetism-adjusting windings are converted into alternating-current armature windings. Requirements on performance in a low-speed area and in the high-speed area can be met at the same time; influence of an armature reaction field on the aluminium-nickel-cobalt permanent magnets with low coercivity is small; the utilization rate of permanent magnetism, the torque density, and the reliability of system operation are high.

The invention discloses an axial magnetic field magnetic flux switching type surface-mounted permanent magnet memory motor. The permanent magnet memory motor comprises a first rotor (41), a second rotor (42), a stator (1) and an installing shaft, wherein the stator (1) is arranged between the first rotor (41) and the second rotor (42) and of an axial two-side symmetrical structure, the installing shaft is used for coaxially installing the stator (1), the first rotor (41) and the second rotor (42), and the stator is located between the two rotors to form an axial two-air-gap motor. The stator (1) is of the two-side symmetrical salient pole structure and comprises a stator iron core (2), a plurality of permanent magnets (3), a three-phase armature winding (5) and a single-phase pulse winding (6). The stator iron core (2) comprises a stator yoke (2.1) and stator teeth (2.2), wherein the stator teeth (2.2) protrude in the center direction of the first rotor (41) and in the center direction of the second rotor (42) respectively from the stator yoke (2.1). By the adoption of the permanent magnet memory motor, power density of the motor is improved, and the wide rotating speed operation range is possessed.

The invention discloses a thrust optimization design method for a tubular permanent magnet synchronous linear motor, which comprises: firstly, building a solid model of the motor and setting run option parameters including the length of the primary iron core of the primary iron core stator of the motor; secondly, resolving the run option parameters by using a finite element method and building a finite element geometrical model; thirdly, calculating the optimization phase difference between the end forces at the two ends of the primary iron core stator according to a formula, and regulating the length of the primary iron core to obtain the optimal length of the primary iron core, which corresponds to the optimization phase difference; and finally, obtaining the tubular permanent magnet synchronous linear motor with the smallest thrust fluctuation through magnetization by the optimal length of the primary iron core, the half-open, half-closed, round-bottom grooved tooth-groove structure and a Halbach structure. In the invention, the thrust fluctuation is minimized by relieving the influences of magnetic drag produced by an end effect and a tooth-groove effect on the thrust fluctuation; the method is simple and effective; and the calculation accuracy is high, and the motor can serve as both an electrical motor and a generator.

The invention discloses a built-in permanent magnet memory motor of a magnetic flux switching type. The permanent magnet memory motor comprises a casing, a stator, a rotor and a rotating shaft, wherein the stator is a cylinder with a through hole and is formed by a star-shaped magnetic isolation block with a center through hole and partitioned rotor iron core discs; the rotating shaft is fixedly connected in the center through hole of the magnetic isolation block; and the partitioned rotor iron core discs are shaped like a fan and are uniformly distributed at the circumference of the rotor as well as fixedly connected to the outer surface of the magnetic isolation block. The stator comprises a stator iron core, permanent magnets, three-phase armature windings and pulse windings, wherein the stator iron core comprises a stator yoke and stator teeth formed by permanent teeth and armature teeth; the permanent magnets are shaped like a tile and radially magnetized, so that magnetic leakage factors are small; the magnetization directions of the two adjacent permanent magnets are opposite; the three-phase armature windings are wound on the armature teeth; and the pulse windings are wound on the permanent magnets. According to the permanent magnet memory motor, the weak magnetic ability and the rotation speed running range of the motor can be improved; and the no-load air gap magnetic field can be adjusted. In addition, the permanent magnet memory motor disclosed by the invention is strong in mechanical reliability, thereby being suitable for high-speed running.

The invention discloses a magnetic flux switching type permanent magnet memory motor comprising an enclosure, a stator contained in the enclosure, a rotor (2) and a non-magnetic rotary shaft (8). The magnetic flux switching type permanent magnet memory motor is characterized in that the stator (1) is arranged at the outer part of the rotor (2); the rotor (2) is fixedly arranged on the non-magnetic rotary shaft (8) and is in a convex pole type; the rotor (2) comprises a rotor main body part and rotor teeth which protrude from the main body part to a direction which is far away from the center of the rotor; the stator comprises a stator iron core (1), a permanent magnet (3), a three-phase armature winding (4) and a pulse winding (5); the stator iron core (1) comprises a plurality of stator yokes and stator teeth (1.1) which protrude from the stator yokes to the direction of the center of the stator iron core; and the three-phase armature winding (4) is wound on the stator teeth (1.1). According to the magnetic flux switching type permanent magnet memory motor disclosed by the invention, a motor no-load gap magnetic field is adjustable, and the weak magnetism capability and the rotary speed operation speed of the motor are improved; and meanwhile, the torque and the power density of the motor are improved and the copper consumption of the motor is reduced.

The invention discloses a magnetic gear type double-stator hybrid permanent magnet memory motor. The motor comprises an external stator, a rotor and an internal stator which are coaxially arranged and sleeved from outside to inside in turn. The external stator comprises armature iron core teeth, stator yokes and armature windings which are arranged on the armature iron core teeth. The internal stator comprises an internal stator iron core provided with internal slots, neodymium iron boron permanent magnets, aluminum nickel cobalt permanent magnets and pulse magnetic regulating windings which are arranged in the internal slots of the internal stator. The two types of co-excitation permanent magnets are arranged in a "U" shape. The number of single permanent magnets on the internal stator is equal to that of external stator armature teeth. The whole rotor has an annular cup-shaped structure. Rotor iron blocks are fixed in a non-magnetic-conductive epoxy resin sleeve. The rotor iron blocks are connected via magnetic conductive bridges. Disadvantages that a conventional single stator has multiple internal excitation sources which are mutually hindered in space and torque density is relatively low can be solved. Besides, high power density is realized by arrangement of double-stator hybrid permanent magnets, and residual magnetization intensity and magnetization direction of the permanent magnets are regulated by applying pulse current so that motor magnetic field high-efficiency regulation is realized, and rotating speed operation range is enhanced.

The invention discloses a magnetism-gathering-type magnetic flux switching permanent magnet memory motor, which comprises a stator, a rotor (2) and an un-conducted magnetic shaft (8), wherein the stator (1) is arranged outside the rotor (2); the rotor (2) is fixed on the un-conducted magnetic shaft (8) and is in a salient pole type; the stator comprises a stator core (1), a first permanent magnet (3a), a second permanent magnet (3b), a three-phase armature winding (6), a first pulsed winding (4a) and a second pulse winding (4b); the stator core (1) comprises a plurality of stator yokes and stator teeth protruding to the center direction of the stator core from the stator yokes; and a stator slot is formed between the adjacent stator teeth. With the adoption of the magnetism-gathering-type magnetic flux switching permanent magnet memory motor, the residual magnetization of the permanent magnet is adjusted through applying pulse current to a pulse winding; a motor no-load air-gap field can be adjusted; the weak magnetic ability of the motor and the rotating speed operation range are improved; and meanwhile, the torque and power density of the motor can be effectively improved through magnetism-gathering-type armature teeth, and the copper loss of the motor is reduced.

A linear motor is provided which includes members for engaging a magnet rail to prevent bending of the magnet rail. Such members may include a wheel or sliding block, for example. The members exert a force proximate an upper edge of the magnet rail to counter potential bending of the magnet rail during operation of the motor, and thereby avoid substantial variations in the air gaps. Furthermore, an armature yoke is provided which includes at least one partial tooth at one end of the armature yoke for reducing an end effect cogging of the linear motor armature in relation to a magnet rail along which the armature will run. In addition, an armature yoke is provided which includes multiple segments which are held end-to-end via fasteners. Such fasteners may serve as part of the magnetic flux path. A support strip may be provided to reduce bowing.

The invention discloses a testing device for measuring soil resistance in a motion process of a buried submarine pipeline. The testing device comprises a test tank for containing silt, a test pipeline which passes through the test tank and can move along the axial, horizontal and vertical directions, and a loading frame of which one side is connected with two ends, which are positioned on the outer side of a test tank body, of the test pipeline, and of which the other side is connected with a driving device through a steel wire rope, wherein resistance-type displacement dial indicators are arranged at two ends of the test pipeline respectively and are connected with the input end of a dynamic data acquisition instrument through a cable; the output end of the dynamic data acquisition instrument is connected with a computer; a tension and pressure sensor connected with the input end of the dynamic data acquisition instrument is arranged on the steel wire rope which is connected with the loading frame and the driving device. According to the device, the motion and change rules of a soil body in the test process can be conveniently observed, and a test process and required test data can be completely and accurately recorded so as to grasp the variation trend of the soil resistance.

A linear motor is provided which includes members for engaging a magnet rail to prevent bending of the magnet rail. Such members may include a wheel or sliding block, for example. The members exert a force proximate an upper edge of the magnet rail to counter potential bending of the magnet rail during operation of the motor, and thereby avoid substantial variations in the air gaps. Furthermore, an armature yoke is provided which includes at least one partial tooth at one end of the armature yoke for reducing an end effect cogging of the linear motor armature in relation to a magnet rail along which the armature will run. In addition, an armature yoke is provided which includes multiple segments which are held end-to-end via fasteners. Such fasteners may serve as part of the magnetic flux path. A support strip may be provided to reduce bowing.

The invention discloses an E-shaped stator core flux switching type hybrid permanent magnet memory motor and belongs to the field of flux-adjustable permanent magnet motors. Both rotor and stator cores of the motor adopt a salient pole structure. A stator of the motor comprises six E-shaped stator cores, V-shaped aluminum-nickel-cobalt permanent magnets, tangential-magnetizing rectangular neodymium iron boron permanent magnets and a whole layer of stator yokes, wherein adjacent neodymium iron boron permanent magnets with opposite polarities are inlaid between the two adjacent E-shaped stator cores, and a three-phase concentrated winding armature winding is wound across a sandwich-shaped unit composed of the core edges of adjacent E-shaped stator units and the neodymium iron boron permanent magnets; a groove between two adjacent V-shaped aluminum-nickel-cobalt permanent magnets is used for placing a concentrated single-phase pulse winding. The E-shaped stator core flux switching type hybrid permanent magnet memory motor greatly alleviates a space conflict between electromagnetic loading in the stator cores and pulse magnet-adjustment capacity, can realize flexible online magnet adjustment and has little loss of excitation, the torque density and the force and energy expression of the motor can be improved, and the fault-tolerant fault operation ability is good.

The invention discloses a pole-shaped device of magnetron sputtering, comprising a target barrel, an arc shelter cap and a magnetic pole device; the arc shelter cap is arranged at the side face of the target barrel; the magnetic pole device consists of a plate type field yoke, a side magnet steel and a central magnet steel which are fixed parallel on the plate type field yoke and parallel with the plane and a central separating strip is positioned between the side magnet steel and the central magnet steel; the plate type filed yoke is fixed parallel at the other side face of target barrel opposite to the arc shelter cap. Furthermore, strengthening magnet steels are mounted at the upper and the lower end faces of the central magnet steel, the height of the end face of strengthening magnet steel which closes to the end face of the central magnet steel is lower than that of the end face of the central magnet steel. Due to the strengthening magnet steel, the invention overcomes the disadvantages that the arrangement of the prior magnet poles can cause the magnetic field of end face is weaker than that of central magnetic field, so as to ensure a much even level magnetic field of target face; thus, the whole mechanical erosion of the target is even and the magnetic circuit is completely closed, further increasing the utility rate of the target.

A variety of approaches to reducing or eliminating “end effect” or the tendency of tubular ends to reduce in diameter after expansion are disclosed. Some involve pre-bending the ends outwardly while others involve removing material internally or / and externally near the ends. Yet other approaches feature weakening the ends in other ways including penetration of the tubular material using openings of various shapes including slots or / and holes where the openings are between the tube ends or where they can extend on one or both ends all the way to the end of the tubular. Inserts that are softer than the tube material can be placed near the ends. If there is an end effect, then the protruding material can be pushed out of the way or broken off.

The invention discloses a middle and low speed maglev train walking module with an air spring arranged in the middle. The invention includes a suspension frame (1), and two traction rods (2) and an air spring (3) which are arranged on the suspension frame (1), wherein, the central position of the suspension frame (1) is transversely provided with a bolster (4); both ends of the bolster (4) are supported on the suspension frame (1) by the air spring (3) below; the external sides at both ends of the bolster (2) are suspended with a hoist rod (9); the other end of the hoist rod (9) is articulated with the vehicle body. The walking mechanism has the advantages of simple structure, low production cost, easy installation and manufacture, large beeline motor power, high efficiency and fast operation speed of the maglev train.

A trim vane assembly for amphibious armored vehicles and having a trim vane movable along a generally horizontal path between a deployed position in which the trim vane extends rearward from the vehicle and a stowed position in which the trim vane is positioned beneath the amphibious vehicle. In the retracted position, the trim vane movable is flush against or received within the vehicle bottom such that the trim vane supplements the belly armor. Similarly, the trim vane extends from or overlaps with the bottom of the vehicle when extended into the deployed position to provide continuous bottom face of the vehicle extending from the front of the vehicle to the end of the trim vane. Conventional trim vanes are rotated between a vertical orientation against the rear of the vehicle and a horizontal position extending from the rear of the vehicle reducing viscous drag.

The invention provides a suspension frame carrying arm structure of a middle-low-speed magnetic suspension vehicle, and relates to the technical field of magnetic suspension vehicle travelling mechanisms. The suspension frame carrying arm structure comprises an upper carrying arm portion, a lower carrying arm portion and a longitudinal beam connected with a carrying arm. The upper carrying arm portion and the lower carrying arm portion are in joggle joint through a tenon and a mortise, and are fastened through a bolt; the upper carrying arm portion and the longitudinal beam are in joggle joint through a tenon and a mortise, and are fastened through a bolt. Each tenon is of a hollow structure in the shape of double-hollow square blocks, and two rows of screw holes are distributed evenly in each of four surfaces. The lower carrying arm portion is an 'r-shaped' structure with a mounting base, the horizontal end of the 'r-shaped' structure is a mortise matched with a first boss structure, and two rows of screw holes are distributed evenly in each of four surfaces of the 'r-shaped' structure. A mounting base is arranged at the vertical end of the 'r-shaped' structure. A bevel with ridges is arranged at the right-angle position of the 'r-shaped' structure. Other two embodiments can be derived on the basis of the joggle-joint structures. The suspension frame carrying arm structure is mainly applied to suspension frame carrying arms of middle-low-speed magnetic suspension vehicles.

The invention discloses an intelligent dirt removal and ice melting device for a solar panel. The intelligent dirt removal and ice melting device comprises a linear drive motor mounted on the solar panel and cleaning brushes arranged on two sides of the linear drive motor and driven by the linear drive motor, wherein each cleaning brush comprises a support as well as bristles, a temperature sensor, water spraying holes and air blowing holes which are arranged on the support. The intelligent dirt removal and ice melting device is mounted on the solar panel, can completely maintain the solar panel without dead angles under the drive of the linear motor, can be combined with the controller, automatically performs intelligent operations such as dirt removal solution spraying, hot air blowing and the like and can automatically melt ice, remove dirt and the like. Compared with a current solar clean technique, the intelligent dirt removal and ice melting device is novel and simple in structure and low in cost, has prominent machine maintenance and intelligent maintenance functions and is safe and reliable, and manpower and material resources are saved.

The invention discloses a middle-low-speed normal conducting maglev vehicle motor stator winding multi-segment distribution structure. A large linear motor is used at a single side of each carriage of a maglev vehicle, a stator winding of each large linear motor is divided into N segments of the same length and distributed on corresponding N steering frames, the distance between each segment of motors is 1 / N of motor pole distance, two adjacent segments of motor windings are arranged differently, and the phase sequence of the next segment of motor winding is lagged 60 degrees than that of the front segment of motor winding, thereby making air gap magnetic fields between each segment of motors continuous. The middle-low-speed normal conducting maglev vehicle motor stator winding multi-segment distribution structure can obviously increase efficiency and power of the motors, creates conditions for designing high-speed maglev vehicles. The similar design principle can be applied to a driving method of a linear asynchronous motor of wheel track vehicles such as light rails or subways.

The invention discloses a hybrid excitation type magnetic flux switching motor with K-shaped stator cores, and belongs to the technical field of fabrication of a motor. Permanent magnets, armature windings and single-phase excitation windings are arranged at a stator part, stator cores are in K shapes, each permanent magnet is embedded between adjacent stator cores, the armature windings are three-phase concentrated windings which are wound at inner sides of stator teeth of adjacent K-shaped stator cores at two sides of each permanent magnet in a bridging way, the single-phase excitation windings are wound at outer sides of two stator teeth of each K-shaped stator core in a bridging way, and no permanent magnet and no winding are arranged at a rotor part. The hybrid excitation type magnetic flux switching motor is compact, simple and firm in structure, the no-load magnetic flux of the magnetic flux switching motor is maintained to be dual-polarity characteristic, meanwhile, a hybrid excitation function is achieved, the magnetic flux switching motor has relatively high torque output capability and relatively high power density, the regulation range of an air-gap magnetic field is broaden by adjusting an excitation current, and the magnetic flux switching motor is good in magnetic regulation performance.

The invention discloses a linear motion structure of a permanent magnet synchronous linear motor. The linear motion structure comprises a secondary pole and a primary pole. The secondary pole comprises a secondary yoke plate and a permanent magnet array. The primary pole comprises a primary iron core and a primary winding. The permanent magnet array comprises a front permanent magnet set, a middle permanent magnet set and a back permanent magnet set which are successively arranged in a front-and-back direction. The middle permanent magnet set integrally shifted leftwards or rightwards relative to the front permanent magnet set, and furthermore the shifting distance is tau / 2. The widths of the front permanent magnet and the back permanent magnet in the front-and-back direction are m respectively, and the width l of the middle permanent magnet in the front-and-back direction is 2m. According to the linear motion structure, the magnetic pole of the middle permanent magnet is shifted by tau / 2 relative to the front permanent magnet, thereby realizing a phase difference 90 DEG between thrust fluctuations which are generated by one end of the motor, realizing mutual offset of the thrust fluctuations, reducing an end effect of the linear motor and settling a thrust fluctuation problem caused by normal force fluctuations. Furthermore the linear motion structure has advantages of simple manufacture process and high convenience in batch production.

The invention discloses an evaluation and analysis method for an air-tight seal special thread vibration fatigue failure test. The evaluation and analysis method includes the steps: carrying out an evaluation method for an air-tight seal special thread vibration fatigue failure test on a physical sample; analyzing the maximum principal strain and the maximum principal stress of the thread structure and the main sealing surface in a load state according to finite elements; judging whether a material mechanical property change cyclic softening condition is met or not according to the stress state of the main sealing surface, carrying out a material cyclic stress-strain test by adopting a fatigue test axial force control method according to the maximum main stress change amplitude, and establishing a material yield strength variable function; and determining final yield strength, substituting the final yield strength into the finite element model to analyze sealing energy changes of mainseal contact pressure and length, comparing the sealing energy changes with internal pressure, determining seal integrity and thread structure fatigue failure performance, and completing air-tight seal special thread vibration fatigue failure analysis. According to the evaluation and analysis method, a basis is provided for sealing and structural integrity use and analysis and prediction of the air-tight seal special thread under the specific working condition vibration load.

The invention discloses a primary winding of a cylindrical asynchronous linear motor. The primary winding is characterized in that: the primary winding is a spiral winding, and is formed by continuously spirally winding a three-phase wire at the interval of 120 degrees along a circumferential direction in form of constant diameter spiral line. When wound to an end part, the three-phase wire is wound back along a spiral direction the same as that of the wire of the upper layer after 180-degree transposition, and repeated operations are performed to realize the winding of a multi-layer multi-turn wire. Lead wires at the leading-out end of the three-phase wire are all distributed at one end of the primary winding. The primary winding is wound in a constant pitch way or a variable pitch way.

A middle and low speed maglev train walking mechanism with an air spring arranged in the middle consists of a movable-type walking module and a fixing-point type walking module. Both the walking modules have a bolster transversely arranged in the middle position of a suspension frame; the end part of the bolster is fixedly supported on the suspension frame by the air spring. The center of the movable-type walking module bolster is pinned with a traction block by a connecting pin; the front part and the rear part of the traction block are respectively articulated with a traction arm; the other end of the traction arm is articulated with a vehicle body; both ends of the bolster are articulated with two traction rods on the suspension frame; the external sides at two ends of the bolster are suspended with a hoist rod; the other end of the hoist rod is articulated with the vehicle body. The central position of the fixing-point walking module bolster is provided with a pin hole connected with the central pin of the vehicle body; both ends of the bolster are articulated with the traction rod on the suspension frame; the traction rod is respectively arranged on the front part and the rear part of the suspension frame. The walking mechanism has the advantages of simple structure, low production cost, easy installation and manufacture, large beeline motor power, high efficiency and fast operation speed of the maglev train.

The invention discloses a hybrid excitation wind driven generator based on split magnetic steels, which comprises stators and a rotor with helical teeth. The stators are arranged concentrically aroundthe rotor, and the inside ends of the stators are next to the helical teeth; magnetic steel grooves are formed between the stators, and magnetic steels with different polarities are respectively arranged at both ends of the magnetic steel grooves to form magnetic steel pairs; exciting windings are arranged between the magnetic steels to form stator permanent magnetic steels, and the stator permanent magnetic steels are alternatively arranged in a N->S form; and stator grooves are formed in the stators, and armature windings are arranged in the stator grooves. By dividing each permanent magnetinto both upper and lower sections, permanent magnet loss, eddy-current loss and magnetic hysteresis loss are reduced, an iron core utilization rate of the stators is improved, and a counter potential amplitude of the generator is increased; by the armature windings, armature copper loss is reduced; by the exciting windings, an end effect of the generator is reduced, and meanwhile, loss is reduced; moreover, a direct current cannot be coupled with the armature windings, so that a counter potential waveform of the generator is not influenced; by the closed magnetic steel grooves, leakage fluxis reduced, so that a utilization rate of the permanent magnets is improved; and by double excitation, power supply quality of a motor is ensured.

The invention discloses a preparation method of a flexible composite nanofiber membrane with a core-shell structure, the preparation method comprises the following steps: mixing tetraethoxysilane, pure water, absolute ethyl alcohol and anhydrous acetic acid, and stirring until the mixture is clear to prepare a silicon source solution; dissolving a high-molecular polymer in a solvent to prepare a high-molecular polymer solution; preparing an absolute ethyl alcohol solution of zirconium oxychloride, adding anhydrous acetic acid, and stirring at normal temperature until the solution is clear to prepare a zirconium source solution; mixing and stirring the prepared silicon source solution and the prepared high-molecular polymer solution in a water bath, mixing and stirring the prepared zirconium source solution and the prepared high-molecular polymer solution in a water bath, and respectively standing and aging to prepare a silicon source spinning solution and a zirconium source spinning solution; carrying out coaxial electrostatic spinning by taking the silicon source spinning solution as a core spinning solution and the zirconium source spinning solution as a shell spinning solution to prepare a flexible composite nanofiber membrane precursor with a core-shell structure; and sintering the flexible composite nanofiber membrane precursor with the core-shell structure to prepare the flexible composite nanofiber membrane with the core-shell structure.

The invention discloses a dual-rotor axial flux block structure switched reluctance motor. The dual-rotor axial flux block structure switched reluctance motor comprises a stator(1), a left rotor(2), aright rotor(3), an exciting winding(4), rotor end covers(5), bearings(6) and a hollow support tube(7); the stator(1) comprises an exciting pole(1-1), an external magnetic conduction ring(1-2), an internal magnetic conduction ring(1-3), an exciting pole support piece(1-4) and a stator support piece(1-5); the left rotor(2) comprises a left rotor block iron core(2-1) and a left rotor support piece(2-2); and the right rotor(3) comprises a right rotor block iron core(3-1) and a right rotor support piece(3-2). The dual-rotor axial flux block structure switched reluctance motor disclosed by the invention adopts a centralized winding form; on the one hand, the utilization ratio of the motor winding is improved, and on the other hand, the end effect of the motor is weakened; therefore, the reliability of the motor is improved; furthermore, the adopted block stator structure and rotor support piece with smooth surface are also helpful to restrain the wind-friction loss of the motor and improvethe efficiency of the motor.

The invention belongs to the field of nuclear reactors, and particularly relates to a modular electromagnetic pump for transporting liquid metal in the nuclear reactor. The pump comprises a pump gutter assembly and an electromagnetic module, wherein the electromagnetic module is used for providing electromagnetic force; the pump gutter assembly penetrates the center of the electromagnetic module;flanges are arranged at both ends of the electromagnetic module; fixed blocks are arranged at connecting parts of the flanges and the electromagnetic module; and thus, the modular electromagnetic pumpis provided.

The invention provides a suspension frame of a medium-low speed magnetic levitation vehicle, and belongs to the technical field of manufacturing of medium-low speed magnetic levitation vehicles. The suspension frame of the medium-low speed magnetic levitation vehicle comprises longitudinal beams and anti-rolling beam assemblies, wherein the longitudinal beams are arranged on the left side and the right side correspondingly, a set of anti-rolling beam mounting seats are arranged on the two sides of the vertical center line of the inner side of each longitudinal beam correspondingly, and the anti-rolling beam assemblies are connected with the longitudinal beams through the mounting seats so as to form the suspension frame; and linear motors are located below the longitudinal beams. Boss structures serving as tenons are arranged in the positions, corresponding to the mounting seats, of the outer side faces of the longitudinal beams correspondingly, tenon holes matched with the boss structures on the outer side faces of the longitudinal beams are formed in the horizontal ends of supporting arms, the four surfaces of the supporting arms are each evenly provided with two rows of through holes, and the supporting arms are matched with the boss structures in a joggled mode and fixed through bolts. Vertical sliding sleds are arranged in the positions, close to the ends, of the inner side faces of the longitudinal beams correspondingly. The suspension frame is mainly used for manufacturing of the medium-low speed magnetic levitation vehicle.

The invention provides a step feature roll-stamping forming limit evaluation die and a measuring method by applying the same. The step feature roll-stamping forming limit evaluation die comprises an upper die set and a lower die set, wherein the upper die set comprises five independent die blocks, at least one upper die block comprises a step feature, the lower die set comprises five independent die blocks, at least one lower die block comprises a step feature, the step feature of the upper die block is matched with the step feature of the lower die block, materials are dragged to flow in therotating process of the die blocks, and the step features are formed on a formed sample piece. By forming the step features of different sizes and measuring the strain of the step feature area and thesizes of the step features, the forming limit of step feature roll-stamping forming of plates is evaluated, and a test basis is provided for establishing a design criterion of step feature roll-stamping forming.

The invention provides a mold for evaluating a convex-feature roll punching forming limit and a measuring method of the mold. The mold comprises an upper mold group and a lower mold group. The upper mold group comprises independent mold blocks, and a concave upper mold block has a concave feature; the lower mold group comprises independent mold blocks, and a convex lower mold block has a convex feature; and the concave feature of the upper mold block and the convex feature of the lower mold block are matched with each other, and materials are drawn to flow in the rotation process of the mold blocks to form a convex feature. The forming limit of convex features formed on sheets through roll punching are evaluated by forming the convex features in different sizes and measuring the strain ofa convex-feature area and the sizes of the convex features, and a test basis is provided for establishing the design criteria of roll punching forming parts.