135results about How to "Reduce thrust fluctuation" patented technology

The invention relates to a multiphase long-stator primary permanent magnet linear motor which has the advantages of simple structure, firmness, stronger output thrust, higher power density and smaller thrust fluctuation. The motor comprises a stator (1), an air gap and rotors (2), wherein each rotor (2) comprises permanent magnets (3), a concentrated winding (4) and additional teeth (5); both the stator and the rotors are double-salient pole single-edges or double-edge flat-panel structures, and all concentrated winding coils of any phase are positioned in a rotor iron core slot; adjacent permanent magnets (3) form a serial magnetic circuit; the number of the permanent magnets (3) is NPM=2k*m+2, wherein k is a positive integer, and the number m of motor phases is not smaller than 3; both end parts of each rotor (2) are respectively provided with a permanent magnet which is an additional permanent magnet of each motor; the number of windings of the rotors is Nmt=(NPM-2)(m+1); and the central distance of adjacent teeth of the rotors is tau p.

The invention discloses a modular primary permanent magnetic linear motor and a motor module consisting of the modular primary permanent magnetic linear motor. The modular primary permanent magnetic linear motor comprises a primary and a secondary, wherein the primary comprises m or 2m primary modules; each primary module comprises two U-shaped magneto-conducting materials and a permanent magnet between the U-shaped magneto-conducting materials; and taum, taus, tauul, tauu, wmt and wst satisfy the following relational expressions that tm is equal to or approximate to ktaus, tauul is equal to or approximate to (j+0.5) taus, tauul is equal to taum-tauul, and wmt is less than or equal to wst. Relative displacement between two primary modules which belong to the same phase is lambda1 which is equal to (n+ / -0.5)taus or lambda1 which is equal to ntaus, and relative displacement between two primary modules which belong to different phases is lambda2 which is equal to (i+ / -1 / m)taus or lambda2 which is equal to [i+ / -(0.5-1 / m)]taus. The motor and the motor module have the advantages of symmetric counter potential, relatively low sine and positioning force, small thrust ripple and the like, and are applied to the places where a long secondary structure linear motor is applied.

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 modular vernier permanent magnetic linear motor based on a Halbach permanent magnetic structure. The modular vernier permanent magnetic linear motor comprises 3k mover modules and one stator, there are air gaps between the two, the stator comprises a permanent magnet which is provided with a stator core, is surface-mounted to the stator core and has a Halbach array structure, armature windings are arranged in grooves of the mover modules, positions of each phase of the armature windings in the different mover modules are different, positions of axles of the same phase of the armature windings in each module correspondingly relative to the stator permanent magnet are maintained consistent, each module can work as an individual complete vernier permanent magnetic linear motor, two adjacent mover modules are connected by use of a magnetic barrier made of a non-magnetic material, the different mover modules respectively generate push forces with certain phase differences with the stator, through modular combination of movers and variation of positions of the windings in the different modules, each phase of the windings is enabled to have a completely symmetric structure in an overall view, and thus the effect of offsetting and weakening thrust fluctuations is realized.

The invention provides a permanent magnet linear motor type electromagnetic catapult for an unmanned aerial vehicle. The permanent magnet linear motor type electromagnetic catapult comprises a catapulting rack, an unmanned aerial vehicle supporting and catapulting platform, a power supply system, a brake system and a control system. The permanent magnet linear motor type electromagnetic catapult is characterized in that the catapulting rack can be carried on transport equipment and is provided with linear slide rails, the unmanned aerial vehicle supporting and catapulting platform is supported on the linear slide rails of the catapulting rack through the two sides of the unmanned aerial vehicle supporting and catapulting platform, the catapulting rack is provided with the brake system, the unmanned aerial vehicle is carried on the unmanned aerial vehicle supporting and catapulting platform which can be driven by a catapulting motor to accelerate along the linear slide rails, the catapulting motor is a permanent magnetic linear motor, and when the unmanned aerial vehicle reaches the speed needed for taking-off, the unmanned aerial vehicle supporting and catapulting platform is braked under the damping effect of the brake system, and the unmanned aerial vehicle flies out inertially. The permanent magnet linear motor type electromagnetic catapult overcomes the problems that in the prior art, an unmanned aerial vehicle is poor in maneuverability, low in reliability, poor in concealment and low in efficiency during catapulting.

The invention discloses a modular complementary type primary permanent magnet linear motor and a motor module formed thereby. The primary permanent magnet linear motor comprises a primary level and a secondary level; the primary level and the secondary level are respectively in a salient-pole structure, and an air gap is formed between the two levels; the primary level comprises a rotor module which comprises a first module and a second module; a first non-magnetic material is arranged between the first module and the second module; the first module and the second module both comprise two salient-pole magnetic materials and a permanent magnet arranged between the two salient-pole magnetic materials; the salient-pole magnetic material is provided with m numbered primary teeth, and a central armature winding is arranged on the primary teeth; the relative displacement between the first module and the second module is calculated as follows: lambda2=(k+ / -0.5) tau s; the relative displacement between the adjacent two salient-pole magnetic materials is calculated as follows: lambda1=m*tau m; and the ratio of the primary polar distance to the secondary polar distance is as follows: tau m: tau s=(m+ / -1):m. The invention has the advantages of symmetric back electromotive force, relatively small positioning force, low thrust fluctuation and the like and is applicable to the application occasion of a linear motor with a long-stator structure.

The invention relates to a high-power density permanent magnet motor belonging to the field of motors. The invention solves the problems of low efficiency and thrust density, large thrust fluctuation and high vibration and noises of the traditional double-edge ironless straight line permanent magnet synchronous motor, which are caused by low air gap magnetic density and poor sine degree of air gap magnetic density wave forms. An air gap is positioned between a primary pole and a secondary pole of a straight line motor; main permanent magnets and isolated magnets are sequentially arranged on the inner wall of a yoke plate at intervals; the inner sides of the main permanent magnets are provided with assembling magnets which have same widths along a motion direction; the inner sides of the isolated magnets are provided with auxiliary permanent magnets which have same widths along the motion direction; the outer side surfaces of m auxiliary permanent magnets and m assembling magnets are positioned on a same plane; the main permanent magnets are parallelly magnetized in magnetizing directions perpendicular to the motion directions of active cells, and every two adjacent main permanent magnets are in reverse magnetizing directions; the auxiliary permanent magnets are parallelly magnetized in the magnetizing directions parallel to the motion directions of the active cells, and every two adjacent auxiliary permanent magnets are in reverse magnetizing directions.

The invention discloses a double-sided permanent magnet linear synchronous motor which comprises two magnetic poles arranged respectively on two sides and an armature between the two magnetic poles, and two laminated iron cores are assembled together to form the armature. The two magnetic poles are mutually staggered in the horizontal direction and the two iron cores are flushed with other in the horizontal direction, or the two iron cores are mutually staggered in the horizontal direction and the two magnetic poles are flushed with other in the horizontal direction. According to the double-sided permanent magnet linear synchronous motor, the number of iron core slots is greater than the number of the magnetic poles, the magnetic poles of the left side and the right side are mutually staggered or the two iron cores are mutually staggered, and end force is basically counteracted, so that thrust ripple is greatly weakened. The double-sided permanent magnet linear synchronous motor has the advantages of being convenient to regulate, easy to achieve, large in regulating scope, and convenient to install and maintain and the like. The double-sided permanent magnet linear synchronous motor is suitable for situations of high speed, high accuracy, high efficiency, and high thrust.

The invention relates to a permanent magnet linear voice coil motor with high thrust-weight ratio for a direct drive valve, comprising an inner stator, an outer stator, a magnetic steel component, a moving coil winding, a moving coil support and an end cover. The permanent magnet linear voice coil motor is characterized in that the magnetic steel component is two circular magnetic steel components which are bonded on the inner wall of the outer stator by a high-strength adhesive; the inner and the outer stators are both bonded on the end cover by adopting the high-strength adhesive; a spigot is processed on the end cover for realizing the mechanical positioning of the inner and the outer stators with the end cover; two annular air gaps are formed between the inner and the outer stators and the two annular magnetic steel components; the moving coil winding adopts two sets of windings, the numbers of turns of the two sets of windings are equivalent, and the winding directions are opposite, each set of winding is respectively arranged in the two annular air gaps constituted by the inner and the outer stators and the two annular magnetic steel components; the moving coil winding adopts a copper clad aluminum enameled wire, the wire winding method of the moving coil winding adopts the multi-layer flat winding; the moving coil support adopts a nylon rod with light weight, high strength and high temperature resistance; and a through hole is formed on the end cover.

The invention discloses a composite winding ironless linear permanent magnet synchronous motor and relates to a coreless linear permanent magnet synchronous motor, and solves a problem that when applied in the field of ultra-precision motion control, a linear secondary permanent magnet synchronous motor with double secondary coreless structure has large thrust fluctuation, low power density and large secondary eddy current loss. The composite winding ironless linear permanent magnet synchronous motor comprises a primary side and a secondary side. The primary side comprises a primary substrateand two primary windings. The two primary windings are arranged on the left and right sides of the primary substrate respectively. The windings in corresponding phases of the two primary windings areconnected in series. In the direction of motion, the windings in the corresponding phases of the two primary windings have a phase difference. The secondary side is a U-shaped bilateral structure andis arranged on both sides of the primary side. Two air gaps are arranged between the primary and secondary sides. The composite winding ironless linear permanent magnet synchronous motor is mainly applied to the field of ultra-precision motion control.

The invention relates to an internal heat radiation composite magnetic flux switching permanent magnet motor including two stators, two rotors, armature windings, permanent magnets, a magnet insulation ring, and radiating holes. In one aspect, internal and external rotors don't have permanent magnets and any excitation windings, so that the motor has the characteristic of firm structure; and in another aspect, the two rotors are provided with the permanent magnets and the armature windings and are connected through the magnet insulation ring, and the heat of the motor can be radiated from the inside through the radiating holes. A permanent magnet magnetic flux switching motor is kept in structure, the advantages of good robustness and high speed running can be achieved. The heat radiation of the side of the motor can be realized without additionally increasing the size of the motor, so that the motor can be high in reliability and good in overloading capability, and is suitable for the conditions requiring small size and high reliability and having bad heat radiation.

The invention relates to a U shape linear servo motor comprising a stator, a mover, an installed platform and a coil winding. The stator comprises magnetic steels and a U shape base; the coil winding is inserted in the mover with the upper end connecting to the installed platform fixedly connected with a linear guideway while the other end clamped between the magnetic steels and forming an air gap with the magnetic steel. One group of the magnetic steels is formed by a monomer magnetic pole with an N pole and an S pole. Multiple groups of magnetic steels are symmetrically and parallelly arranged on both sides of the U shape base and U shape cavity along the mover axes and the magnetic polarity of the magnetic steels at the adjacent position is reverse. The linear servo motor has advantages of simple structure, good rigidity of the mover structure and high frequency stability, good heat dissipation performance of the whole machine and high unit power density, effectively weakens the motor cogging reluctance, improves the thrust stability during the whole machine running, solves the difficult problem puzzling the linear motor control technique development for a long time, realizes industrial production and effectively expands the application field of the linear motor.

The invention provides a low-thrust-fluctuation continuous pole permanent magnet synchronous linear motor, which belongs to the technical field of motors. The low-thrust-fluctuation continuous pole permanent magnet synchronous linear motor comprises a primary assembly and a secondary assembly, wherein the primary assembly is composed of an armature winding and a primary iron core, a groove is formed in the primary iron core, the armature winding is arranged in the groove, phase positions of unit motors are staggered by 180 degrees by means of the structural design of the primary iron core, and winding directions of in-phase windings on the adjacent unit motors are opposite; and the secondary assembly is composed of permanent magnets and a secondary iron core, magnetizing directions of the permanent magnets are the same, and the secondary iron core is composed of secondary teeth and secondary back yokes between the permanent magnets.

The invention discloses a magnetic field modulation permanent magnet linear motor capable of improving winding utilization rate and an optimization design method thereof, and belongs to the field of a permanent magnetism motor. The permanent magnet linear motor comprises a single primary side and double secondary sides. An air gap is arranged between the single primary side and each of the double secondary sides. The single primary side is formed by three unit modules. Each unit module is slotted in the sides close to the air gaps to form four primary teeth and two primary slots. The tooth end of each primary tooth is provided with a plurality of virtual slots and virtual teeth in the motor motion direction, wherein the number of the virtual teeth is larger by one than that of the virtual slots, and each virtual slot is embedded by a magnetic concentrating unit formed by three permanent magnets. Three phases of windings in the primary slots are wounded on yoke portions of the three primary unit modules respectively; and each phase of winding can cut magnetic force lines generated by the permanent magnets on the four primary teeth in the corresponding module simultaneously. The permanent magnet linear motor improves winding utilization rate, reduces half of the winding use amount and reduces copper consumption under the condition of ensuring that performance indexes of no-load counter potential, thrust output, permanent magnet use amount and fault-tolerant capability and the like are not influenced.

The invention discloses a coreless permanent magnet synchronous linear motor with double-layer reversely tilting windings. Mover coils in the permanent magnet synchronous linear motor are set as double-layer coil windings: upper-layer coil windings and alower-layer coil windings. The upper-layer coil windings and the lower-layer coil windings are set in planes where the upper-layer coil windings and lower-layer coil windings are in a tilting mode. Each pair of windings at upper and lower corresponding positions in the upper-layer coil windings and the lower-layer coil windings symmetrically tilt towards opposite directions by taking a center line as a symmetric center, thereby forming a double-layer reversely tilting winding form. According to the coreless permanent magnet synchronous linear motor with the double-layer reversely tilting winding, thrust ripples of the motor are clearly reduced, thrust density of the motor is improved, motor operation is relatively stable, motor processing precision is improved, and the motor is widely applied to precision machining.

The invention relates to a high-power density permanent magnet motor, belonging to the field of motors, solving a problem of poor sine degree of an air gap flux density waveform in a conventional motor. The cross section of each main permanent magnet body in a linear electric motor secondary unit is in a shape of bilaterally symmetric hexagon or octagon, the bottom edge of the hexagon or octagon, close to an air gap side is shorter than the bottom edge far away from the air gap side, the main permanent magnet bodies are magnetized in parallel in a direction vertical to relative motion direction of a primary unit and the secondary unit, auxiliary permanent magnet bodies are magnetized in parallel in the relative motion direction of the primary unit and the secondary unit, and the main permanent magnet bodies and the auxiliary permanent magnet bodies are alternately and closely arranged and fixed on the air gap side of a conductive magnetic yoke. According to the high-power density permanent magnet motor disclosed by the invention, the cross section of each main permanent magnet body in the linear electric motor secondary unit is in the shape of radially symmetric octagon, and the length of the edge of the octagon at the air gap side is smaller than the length of the edge far away from the air gap side; the main permanent magnet bodies are magnetized radially or in parallel, and the auxiliary permanent magnet bodies are magnetized tangentially; and the main permanent magnet bodies and the auxiliary permanent magnet bodies are alternately and closely arranged in the circumferential direction and fixed on the surface of the air gap side of a rotor yoke drum.

The invention provides a unit-motor modularized permanent magnetism synchronous linear motor, and belongs to the technical field of a motor. The unit-motor modularized permanent magnetism synchronous linear motor is formed by a plurality of unit motors, wherein each unit motor includes a primary assembly and a secondary assembly, wherein the primary assembly is formed by a primary iron core and armature windings; grooves are formed in the primary iron core, and the armature windings are arranged in the grooves; the secondary assembly is formed by a permanent magnet and a secondary iron core; an air gap is located between the primary assembly and the secondary assembly; a magnetic modulation structure is arranged between two adjacent unit motors; the width of the magnetic modulation structure is that S=(k+1 / 3)Tau (k is an integer and Tau is the polar distance of the motor); the arranging sequences of the windings in the grooves of two adjacent unit motors are different; and the winding directions of the windings on the two unit motors are opposite. The structure is conductive to inhibition of end portion effect, and can improve asymmetry of three-phase windings of the permanent magnetism synchronous linear motor and reduce thrust ripple.

The invention discloses a fault-tolerate primary permanent magnetic vernier linear motor, which is applied to the field of high-reliability linear driving and comprises a primary winding, a secondary winding and an armature winding; the secondary winding is a simple salient pole structure with ladder-shaped teeth and is longer than the primary winding, an air gap exists between the primary and secondary windings, armature teeth with even number are uniformly distributed on the primary winding, a set of concentrated winding is wound on each armature tooth, a fault-tolerate tooth is arranged between adjacent two armature teeth, a permanent magnet with the magnetizing direction being parallel to the central symmetrical axis of the armature is attached to the lower face of each armature tooth, the permanent magnets are uniformly distributed on each armature tooth, the magnetizing direction of each permanent magnet is in N-S and S-N alternative arrangement, and the magnetizing directions of the permanent magnets on all armature tooth are same in arranging sequence; and the height of the fault-tolerate tooth is equal to the sum of the heights of the armature tooth with the face being attached to the permanent magnetic and the permanent magnet. The fault-tolerate primary permanent magnetic vernier linear motor is simple in structure, large in pushing force, small in pushing force pulse, high in reliability and strong in the running property of the motor with the fault and fault-tolerate property.

The invention provides a poly-phase alternating-current linear motor system for ring windings and belongs to the field of motors. The problems that due to the fact that traditional integer groove single-layer windings are adopted in a three-phase linear permanent magnet synchronous motor, the structure is complex, cost is high, the magnetomotive force and electromotive force harmonic components are large, thrust of the motor is large in ripple, efficiency is low, the lateral bracing span of a rotor is large, and the rotor is large in bracing difficulty are solved. The poly-phase alternating-current linear motor system for the ring windings comprises an m-phase alternating-current linear motor and m / 3 three-phase power converters, wherein m=3k; the m-phase alternating-current linear motor comprises a primary level and a secondary level; the primary level comprises a primary iron core and m / 3 primary ring windings and each primary ring winding is a three-phase ring winding; the electrical angle phase difference between corresponding phases of every two adjacent primary ring windings is delta and delta is + / - 180 degrees per meter. Three outgoing lines of each primary ring winding are correspondingly connected with alternating-current output ends of one three-phase power converter; a direct-current bus is shared by the m / 3 three-phase power converters.

The invention discloses a linear motor with non-uniform teeth and without magnetic track, and relates to the technical field of a permanent-magnet linear motor. The linear motor comprises two parts comprising a rotor and a stator, wherein the rotor comprises a rotor yoke, rotor teeth, rotor tooth end parts, windings and permanent magnets, the stator comprises a stator yoke and stator teeth, the rotor teeth connected with the rotor yoke are arranged in a space in a non-uniform way, the permanent magnets are arranged at the rotor tooth end parts, the windings are arranged in grooves formed by the rotor teeth, and the stator teeth are connected to the stator yoke. The permanent magnets are not needed to be arranged on the stator, the linear motor is low in cost and is simple to install and transmit, and the motor is long in lifetime, small in electromagnetic interference and small in potential risk and has wide application prospect.

The invention discloses a continuous staggered pole permanent magnet synchronous linear motor which comprises a primary, a secondary and an air gap formed between the primary and the secondary. The primary comprises multi-tooth primary iron cores and primary armature windings. The secondary comprises a secondary back yoke iron core, a permanent magnet-iron pole array, and a magnetic isolation material. The permanent magnet-iron pole array is arranged at the upper surface of the secondary back yoke iron core and is laterally divided into two groups with a same length, each group of iron pole and secondary back yoke iron core are integratedly formed, and a magnetic isolation material is arranged between the two groups. The polarities of one group are alternately arranged according to a sequence of N-iron pole-N, the polarities of the other group are alternately arranged according to a sequence of iron pole-S-iron pole, permanent magnets used by the two groups have opposite polarities and are arranged in staggered way, the distance between adjacent secondary permanent magnets is 2tau, and an array is formed according to a cycle of 2tau. Compared with a conventional permanent magnet synchronous linear motor, the continuous staggered pole permanent magnet synchronous linear motor has the advantages of less permanent magnets, a high utilization ratio of the permanent magnets, good thrust performance, high economy and practicability and can be applied in industrial occasions with low speed movement.

The invention provides a unit motor modular consequent pole permanent magnet synchronous linear motor and belongs to the motor technical field. The unit motor modular consequent pole permanent magnet synchronous linear motor is composed of a plurality of unit motors; each unit motor includes a primary assembly and a secondary assembly; the primary assembly is composed of a primary iron core and an armature winding, wherein the primary iron core is slotted, and the armature winding is arranged in the slots of the primary iron core; the secondary assembly is composed of permanent magnets, iron poles and a yoke plate, wherein the iron poles and yoke plate are integrally modeled; an air gap is left between the primary assembly and the secondary assembly; a magnetic adjusting structure is arranged between two adjacent unit motors; the width of the magnetic adjusting structure can be expressed as an equation that S=(k+2 / 3)tau, wherein k is an integer, and tau is the pole pitch of the motors; and the arrangement sequences of the windings in the slots of the two adjacent motor units are different. With the structure adopted, the suppression of an end portion effect can be benefitted, the asymmetry of the three-phase windings of the permanent magnet synchronous linear motor can be improved, and thrust ripples can be decreased.

The invention discloses a novel magnet-gathering type transverse flux permanent magnet linear motor which comprises stators and a rotor. The rotor is rectangular and is composed of two salient pole iron cores and a connecting board. The two salient pole iron cores are fixed to the two ends of the connecting board respectively and respectively provided with a groove. The groove of each salient pole iron core is provided with a permanent magnet and a winding. Multiple strip-shaped air grooves with equal intervals are evenly formed inside each stator. The salient pole iron cores at the two ends of the rotor are arranged in the two stators respectively. According to the novel magnet-gathering type transverse flux permanent magnet linear motor, a primary level and a secondary level are respectively of a salient pole structure, the independence between phases is good, and the high force density and fault tolerance are integrated; the use rate of stator space is high; the fault tolerance capacity is strong and operation reliability is high; fluctuation of the locating force and the pushing force is small and the control characteristic is flexible; the permanent magnets are placed in the primary-level rotor iron cores, so that the temperature is easy to control, the permanent magnet use amount is small, and the motor can be applied to the field with the high requirement for reliable operation of a system.

The invention discloses a two-stage slot less cylindrical permanent magnet linear motor. A first stage primary component comprises a first stage primary iron core and a first stage armature winding, asecond stage primary component comprises a second stage primary iron core and a second stage armature winding, the first stage armature winding and the second stage primary components are adopt slotless structure; the first stage armature winding and the second stage armature winding are respectively fixed in a first stage primary iron core and a second stage primary iron core; The secondary assembly is consist of a secondary core and a permanent magnet; Air gaps are formed between the first stage primary component, a magnetic isolation bridge is arranged between the two stage of primary components, sum of length of the first stage primary iron core and the magnetic isolation bridge is (K+[alpha])*[tau], K is a positive integer, [tau] is pole pitch of the motor, [alpha] is width coefficient of the magnetic isolation bridge, and 0<[alpha]<=0.5; the beginning and end of the second stage armature winding adopt different winding coil according to different [alpha] values, and the windingphase needs to be adjusted according to the value of [alpha]. The motor structure is benefits reducing the locating force and thrust ripple caused by the edge effect.

The invention discloses a modular primary permanent magnet bilateral switched reluctance linear motor. The primary side of the motor is modularized. Each primary module is composed of a magnetically permeable material, an armature winding and permanent magnets distributed in the vertical direction between two magnetic conducting blocks. The secondary side is composed of a magnetically permeable material. The permanent magnets are magnetized in parallel. The permanent magnets corresponding to the adjacent primary modules have the same magnetization direction. The upper and lower corresponding permanent magnets belonging to the same primary module have opposite magnetization directions. In a no-load state, a permanent magnet magnetic circuit is short-circuited by the primary magnetic conducting blocks, and the magnetic force lines hardly pass through an air gap and the secondary side, which reduces the positioning force. In a loaded state, a series magnetic circuit is formed between theprimary magnetic conducting blocks and the bilateral secondary side to generate electromagnetic force. In addition, the modular primary permanent magnet bilateral switched reluctance linear motor hasa simple secondary-side structure and large thrust density, and the permanent magnets are placed in the short primary side to reduce the cost of the motor. The modular primary permanent magnet bilateral switched reluctance linear motor can be applied to long secondary-side occasions such as an elevator driving system.

The invention relates to a novel optimal design method for a permanent magnet synchronous linear motor. The method comprises the steps that (A) a sample machine is analyzed, and main structural parameters which can influence motor performance are determined; (B) a machine learning algorithm -KNN algorithm is used for training and regression fitting of finite element analysis data; (C) a global-scope optimizing algorithm-gravity center neighborhood optimal algorithm is adopted for optimization of motor performance output parameters; and (D) a group of optimal motor structural parameters are solved reversely according to optimal values, and a sample machine is fabricated according to the motor structural parameters and then tested. The method provided by the invention has the beneficial effects that (1) stability, reliability and efficiency of motor running are enhanced; (2) computation results obtained by a finite element analysis method are accurate, and errors during the computation can be eliminated; (3) the KNN algorithm is used for the training fitting of the sample data generated by the finite element analysis, a non-parametric rapid computing model is established, and a foundation is provided for subsequent intelligent algorithm optimization; and (4) application of the gravity center neighborhood optimal algorithm has higher global superiority and is quicker and more accurate.

The invention discloses a ring winding magnetic field modulation linear motor, which belongs to the field of motors and solves the problems of material waste, complicated insulation process between windings, large motor thrust fluctuation and low frequency caused by the long end part of the traditional linear permanent magnet motor winding and the winding mode of the winding. The ring winding magnetic field modulation linear motor comprises a primary winding and a secondary winding, a gap exists between the primary winding and the secondary winding, by adopting pole-slot match between the primary winding and the secondary winding and the ring winding, non-uniform air gap permeance plays a role of pole changing, the magnetic motive force of the primary winding and the air gap permeance interact mutually, a magnetic field with the same pole number as secondary permanent magnets is generated, the two magnetic fields interact mutually to generate a constant thrust, and thus, the limitation that the pole number of the primary winding and the pole number of the secondary winding of the traditional linear permanent magnet synchronous motor need to be the same is further broken. The pole-pairs number P of the secondary permanent magnets, the slot number Q per side of the primary winding and the pole-pairs number S of the primary winding fundamental magnetic motive force meet the following relationship: P=Q+ / -S. The ring winding magnetic field modulation linear motor can be applied to low speed, great acceleration, high output thrust and other situations.

The invention discloses a permanent-magnet linear motor based on an arc-shaped and inner-step shaped hybrid structure of a stator. The motor comprises a stator armature primary side and a Halbach permanent-magnet mover secondary side, the stator armature primary side is located on the outer side of the permanent-magnet mover secondary side, the stator armature primary side is formed by a stator iron core and an armature winding, inner-step shaped structures are adopted by the ends of two sides of the stator iron core, and arc-shaped structures are adopted by inner teeth of the stator iron core; the permanent-magnet mover secondary side is formed by a mover iron core and a permanent magnet adhering to the surface the of the iron core, and a Halbach array structure is adopted by the permanent magnet. By means of the motor, air gap magnetic flux larger than a conventional magnet can be obtained, the motor has a better magnetic shielding effect, and the thickness of a magnetic conductive yoke of the mover can be reduced. The invention provides an analysis model of an arc-shaped tooth structure, and the magnitude of magnetic conductance and a magnetic conductance-position variation curve can be derived by means of the model. The optimal structure of the motor is obtained by adopting a Taguchi optimization algorithm.