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

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 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.

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.

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.

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 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.

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 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.