91 results about "Primary permanent" 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 bilateral primary permanent magnetic vernier linear motor which comprises a primary motor part and a secondary motor part. The primary motor part comprises primary iron cores, an armature winding and permanent magnets. Semi-closed groove design is adopted in the primary iron cores, the permanent magnets are attached to the surfaces of armature teeth, the magnetizing directions of every two adjacent permanent magnets on the same primary iron core are opposite, and the armature winding is installed in a semi-closed groove. The secondary motor part comprises secondary iron cores and secondary salient poles. An air gap is formed between the primary motor part and the secondary motor part. The primary motor part does not need yoke iron cores, so that the weight of the primary motor part is reduced; the secondary motor part is formed only by stacking silicon steel stamped sheets with the salient poles, permanent magnets and windings are not arranged, and the mechanical strength is high; the system dynamic performance can be improved through a movable primary structure; the armature winding and the permanent magnets are all located in the primary motor part so that the motor can be cooled conveniently.

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 long-stroke permanent magnet linear eddy current brake, belongs to the technical field of motors and aims at solving the problems of an existing permanent magnet linear eddy current brake that a size of the magnetic field cannot be adjusted, and a high speed and a lower speed cannot be considered for the same time for the braking force characteristic. The long-stroke permanent magnet linear eddy current brake comprises a primary level part and a secondary level part between which an air gap is formed; the primary level part comprises a primary substrate and primary permanent magnets, wherein the primary substrate is of a flat plate type; the surface of the air gap side of the primary substrate is provided with the strip-shaped primary permanent magnets uniformly along a rotor movement direction; the magnetizing direction of each primary permanent magnet is parallel to the primary substrate and vertical to the rotor movement direction, and the magnetizing directions of the every two adjacent primary permanent magnets are opposite; the secondary level part comprises a secondary conductor plate which is a composite metal plate. The long-stroke permanent magnet linear eddy current brake serves as an eddy current brake.

Systems and methods for fault tolerant communication are provided. A base site is coupled to a central office via a channel service unit. The channel service unit is coupled to the central office via primary and secondary communications links. A first and second permanent virtual circuit couple the channel service unit to a wireless carrier core network. When there is a fault on the primary communication link or the primary permanent virtual circuit user network interface of an aggregator, the secondary communication link is established and the secondary permanent virtual circuit is activated. Communications are then routed to the wireless carrier core network via the secondary communication link and the secondary permanent virtual circuit.

The invention provides a primary permanent magnetic linear motor used for urban rail transit, comprising a primary structure (1) and a secondary structure (2), both of which adopt salient structures; wherein, the primary structure (1) comprises a primary iron core (5), a permanent magnet (3) and an armature winding (4); the permanent magnet (3) is arranged on the primary iron core (5); the armature winding (4) is wound on a primary gear; the primary structure (1) is arranged on a train; and the secondary structure (2) is a magneto-conductive steel rail which is arranged on a train rail. The armature winding (4) adopts an integrated winding structure; and the permanent magnet (3) is arranged between the primary gears or on the surface of the primary yoke part or the primary gear part and can be used for the field of urban rail transit. The primary permanent magnetic linear motor comprises a primary structure with the armature winding, the permanent magnetic pole and the iron core which are arranged on the train, and a primary steel rail which is laid along the guideway line; the structure is simple so that the installation and maintenance are convenient. The primary permanent magnetic linear motor can reduce the cost of the rail transit, improve the efficiency of the motor and have extremely high theoretic and practical values.

The invention discloses a thrust ripple suppressing method of a primary permanent magnet linear motor. Positioning force of the primary permanent magnet linear motor is obtained by measuring in practice by a finite element simulation or torque testing instrument. The waveform of the positioning force undergoes harmonic spectral analysis to confirm the component of base waves and main ultraharmonics in the positioning force. The no-load counter emf wave form of a finite element simulation motor is utilized to calculate out the three-phase current component which is used for counteracting the harmonic component of the positioning force so that additional electromagnetic force is equal to the component of the base waves and the main ultraharmonics in the positioning force in terms of amplitude, but opposite in terms of phase. Three-phase harmonic currents are filled into a current hysteresis vector control system to suppress thrust ripple of the permanent magnet linear motor. The body of the motor does not need transforming and a control strategy can be used for achieving suppression. The thrust ripple of the motor can be obviously hindered, noise in operation of the motor is reduced and characteristics of the motor such as no-load magnetic potentials and thrust outputting capability are kept unchanged.

The present invention provides a kind of rotor and a motor with the rotor. The rotor comprises a shaft, a magnetic yoke of rotor, several primary permanent magnet groups and several secondary permanent magnet groups. The said several primary permanent magnet groups and the said several secondary permanent magnet groups are alternatively distributed along the circumference of the said magnetic yoke of rotor at the same interval. The projection of the said primary permanent magnet group and that of the said secondary permanent magnet group on a plane vertical to the said shaft are adjacent, and their edges overlap. The present invention can reduce torque pulsation caused by the electromagnetic factors, and increase the external work of torque. Therefore, it has good effects on improving power efficiency of the motor and saving energy.

The invention discloses a primary permanent-magnet vernier linear motor and a segmenting method therefor, and belongs to the field of vernier linear motors. A primary side which is provided with a permanent magnet in an embedded manner and a winding is segmented to form an upper primary side and a lower primary side, wherein the upper primary side and the lower primary side are respectively provided with the winding and the permanent magnet in an independent manner, the winding is a centralized or distributed winding, and the permanent magnet is disposed at the lower primary side in a surface-embedded or built-in manner, and also can be embedded at the lower primary side in the surface-embedded if a magnetism gathering module is employed. The magnetism gathering module consists of the following parts: one permanent magnet with the magnetizing direction being in a radial direction, and two smaller permanent magnets which are distributed at two sides of the radial magnetizing permanent magnet, wherein the magnetizing directions of the permanent magnets at two sides are symmetric. A secondary side is a cut-off inverted trapezoidal iron core, and is disposed between the upper primary side and the lower primary side. The linear motor is advantageous in that the primary side is segmented, thereby effectively avoiding the space conflict between the permanent magnet and the winding, facilitating the adjustment of an electric load so as to improve the push density; in addition, a long secondary side has no winding and permanent magnet, thereby greatly reducing the cost; the linear motor can be used in the field of long-distance rail transit.

A magnetic assembly for a nuclear magnetic resonance apparatus includes a number of primary permanent magnets 1 disposed in an array about a longitudinal axis, the arrangement and / or characteristics of the plurality of magnets being such so as to create a zone of homogeneous magnetic field at some location along the axis forward of the array (and into the material when provided). A secondary permanent magnet 7 may be located along the longitudinal axis within the array of primary magnets and may be moveable. The primary magnets 1 have a north pole and a south pole with an axis therebetween, and may be arranged such that the axis between the poles is at an angle to the longitudinal axis.

The invention discloses a linear motor with a controllable magnetic field type primary permanent magnet structure for a city railway train, comprising a primary pole (1) and a secondary pole (2). Theprimary pole (1) and the secondary pole (2) both adopt a salient pole structure, wherein the primary pole (1) comprises a permanent magnet (3), an armature winding (4), an excitation winding (5) and aprimary iron core (6); the secondary pole (2) comprises a secondary iron core (7); the permanent magnet (3) is arranged in the primary iron core (6) on the primary pole (1), the armature winding (4)is a concentrated winding to be wound on teeth of the primary iron core (6), and the excitation winding (5) is wound on the teeth of the primary iron core (6); the primary pole (1) is arranged on thetrain; and the secondary pole (2) is a magnetoconductivity steel rail arranged on a rail of the train. The invention has the magnetic field regulation capacity, can lower the rail traffic cost, enhance the motor efficiency, and has very high theoretical and practical values.

The present invention discloses a cylinder-shaped primary permanent magnet type transverse flux linear motor, comprising a permanent magnet type primary and a secondary; wherein the permanent magnet type primary comprises a stator core, an armature winding and permanent magnets; the stator core is in an annular shape, the inner surface of the stator core is provided with stator core teeth which are arranged uniformly, armature winding coils are wound on the stator core teeth, the permanent magnets are installed to the end surfaces of the stator core teeth, and the magnetizing direction of the permanent magnet is radial; the secondary comprises a shaft, magnet separation rings and a rotor core; a plurality of layers of rotor core rings are uniformly distributed along the axial direction, the rotor core rings are separated by the magnet separation rings; each layer of rotor core ring is formed in the way that a plurality of special-shaped fan-shaped rotor cores are staggered at a certain angle successively along the circumferential direction, and the adjacent rotor cores are staggered at a certain distance along the axial direction. The cylinder-shaped primary permanent magnet type transverse flux linear motor of the present invention solves the problems of complex structure, high manufacturing process difficulty, low primary space utilization rate, high secondary inertia, and low power density of a conventional cylinder-shaped transverse flux linear motor.

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 relates to a linear electromagnetic damper with a serially-connected magnetic circuit structure, belongs to the technical field of motors and aims to solve the problems that prior thrust loading testing devices of linear motors can only load thrust on motors in a single direction, and loaded thrust cannot be changed continuously. The linear electromagnetic damper comprises a primary component and a secondary component, and air space is formed between the primary component and the secondary component; the primary component is composed of a primary iron core, an exciting winding and (2n-1) primary permanent magnets. (2n-1) winding grooves are evenly opened on the surface of the air space side of the primary iron core along the relative moving direction of the primary component and the secondary component, so that a primary tooth and winding groove alternating structure is formed on the primary iron core. Grooving directions of the winding grooves are perpendicular to the relative moving direction of the primary component and the secondary component. A coil is wound on each primary tooth, and coils on all the primary teeth are connected in series to form the exciting winding. A primary permanent magnet is embedded in each permanent magnet groove on the yoke portion of the primary iron core.

The invention discloses a primary permanent magnet linear motor actuator. The primary permanent magnet linear motor actuator comprises a driving shaft, a secondary mover convex tooth block, a secondary mover channel block, primary stator iron cores, an armature winding and a permanent magnet body, wherein a secondary mover of a primary permanent magnet linear motor is arranged on a driving shaft and consists of the secondary mover convex tooth block and the secondary mover channel block arranged in the axial direction of the driving shaft at intervals; four primary stators of the primary permanent magnet linear motor are separately and symmetrically arranged on the outer side of the driving shaft; each of the primary stator comprises two primary stator iron cores; each of the primary stator iron cores is provided with a plurality of stator channels; each of the stator channel comprises a large stator channel and a small stator channel; and the large stator channels and the small statorchannels are arranged at intervals. Through creative proposal of a four-sided tubular structure, the pushing force density and the power density of the actuator can be improved, so that the driving shaft of the actuator has a simple structure and is high in robustness; and through arrangement of a built-in water cooling pipeline, the heating effect is reduced.

The present invention discloses a tooth-socket bilateral primary permanent magnet synchronous linear motor. The motor comprises a primary and two unilateral secondaries, and air gaps are formed between the primary and the two unilateral secondaries. The primary comprises m*k*n basic units, m is a phase number, k is a positive integer and n is the number of motor units. Each basic unit comprises two semi-H-shaped magnetoconductive materials and one permanent magnet arranged between the semi-H-shaped magnetoconductive materials, magnetizing directions of the permanent magnets of adjacent basic units are opposite, and windings revolve around the yoke portions of the basic units. Each secondary comprises magnetoconductive materials with a tooth-socket structure and located at two sides of theprimary. Compared to the prior art, the winding do not pass through the permanent magnets, and the end portions of the windings are shorter, the power density is high to facilitate heat radiation of the permanent magnets, the efficiency is high, and therefore the tooth-socket bilateral primary permanent magnet synchronous linear motor is suitable for occasions such as track drive and the like.

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 provides an LPMSM (linear permanent magnet synchronous motor) with low-thrust fluctuation, belonging to the technical field of motors. The LPMSM is used for solving the fluctuation problem of an existing linear motor with low thrust. The LPMSM comprises two primary permanent magnets, wherein the two primary permanent magnets are fixed at the front and back ends of an armature core respectively. In the invention, the permanent magnets are added to end parts of a primary core, thus magnetic fields generated by the primary permanent magnets interact with magnetic fields generated by secondary permanent magnets, thereby reaching the purpose that acting forces at the front and back end parts of the LPMSM are offset mutually, and eliminating the positioning forces at the end parts; meanwhile, the unbalance between the magnetic fields at the primary end parts and intermediate magnetic fields can be reduced, and the differences between the electromotive forces generated by windings at the two primary ends and the electromotive forces generated by intermediate windings are decreased, thus lowering the fluctuation of electromagnetic forces.

The invention relates to a method for suspending a motor rotor of a micro motor mechanical pump. The method relates to a primary stator coil, a secondary stator coil, a primary permanent magnetic rotor, a secondary permanent magnetic rotor, a permanent magnetic bearing and a taper sliding bearing. At a first stage, the primary stator coil is started to drive the rotors, and stable rotational inertia is give to a stator assembly; at a second stage, the secondary stator coil is started, the stator assembly is disengaged from the taper sliding bearing through the magnetic attracting force generated by dislocation of the magnetic center line of the secondary stator coil and the magnetic center line of the secondary permanent magnetic rotor, and suspension operation of the rotor assembly is achieved. The method for suspending the motor rotor of the micro motor mechanical pump has the advantages that the structure of an electromagnetic suspension control system is simple, complex feedback control is of no need, the friction loss of a bearing is lowered, vibration and noise in the operation process of a motor are lowered, the operation reliability of the bearing is improved, and therefore the service life of the micro motor is greatly prolonged.

The invention relates to the technical field of electric engineering and machinery and discloses a novel gas circuit breaker with real-time adjustable air pressure. According to the novel gas circuit breaker, a pressure sensor is arranged inside an arc extinguish chamber; a transmission rod, a movable core, a static core, a primary permanent magnet, a secondary permanent magnet, a coil and a non-magnetic material are arranged inside a novel magneto-electric mechanism; the arc extinguish chamber is connected with an insulating post; the insulating post is connected with the transmission rod; one end of a control system is connected with the pressure sensor, and the other of the control system is connected with the coil; the gas pressure measured by the pressure sensor is acquired in real time and is fed back to the control system; and the discharging mode of a capacitor is regulated through logical judgment of the control system. Compared with the previous permanent magnet mechanism, the novel magneto-electric mechanism has the advantages that the structure and the working principle are different, reasonable static characteristic curves can be provided, and high retaining force can be provided at the switching-on / off positions. The on-off success rate of the gas circuit breaker is improved, and the novel gas circuit breaker is simple in structure, convenient to maintain and low in economic cost.

The present invention discloses a linear motor traction system cogging force reduction method. The traction system comprises four three-phase primary permanent magnet linear motors, the cogging forces of the linear motors are subjected to Fourier decomposition to obtain the harmonic number m with maximum amplitude; a space distance between a first primary permanent magnet linear motor and a second primary permanent magnet linear motor is (k1+1 / 2(2*m)) [Tau]s, and the whole thereof is a first combination body; a space distance between a third primary permanent magnet linear motor and a fourth primary permanent magnet linear motor is (k2+1 / 2(2*m)) [Tau]s, and the whole itself is a second combination body; the cogging force of the first combination body is subjected to Fourier decomposition to obtain the harmonic number n with maximum amplitude; and a space distance between two combination bodies is (k3+1 / 2(2*m)) [Tau]s, wherein k1, k2 and k3 are positive integers, and the [Tau]s is a stator polar distance. The linear motor traction system cogging force reduction method can substantially weaken the cogging force, can improve the thrust fluctuation performance and keep the static state average thrust of a single motor invariant so as to maintain the original passenger-carrying capability of a train.

A high-speed linear electromagnetic brake relates to the field of a motor and aims to solve the problems that the size of a magnetic field generated by a permanent magnet cannot be randomly adjusted, the dynamic property is poor and the brake characteristic cannot be compatible with high speed and low speed once the permanent magnet in permanent-magnet eddy brake is installed due to the adoption of permanent-magnet eddy to brake and temperature rising caused by the adoption of electromagnetic eddy to brake. The high-speed linear electromagnetic brake comprises a bilateral primary and a variable-structure secondary, wherein the primary is a short primary, the variable-structure secondary is a long secondary, the primary moves and the secondary is fixed during running, the primary comprises a primary substrate and primary permanent magnets, the primary substrate is in a flat shape, the elongate permanent magnets are alternatively arranged along a motion direction in an N-S way at a gap-facing side of the primary substrate, and the structure of the variable-structure secondary is gradually changed from a high-speed segment to a low-speed segment to acquire high brake density.

The invention discloses a semi-centralized open-winding primary permanent magnet linear motor traction system for urban rail transit. The system comprises n + 1 traction converters and n three-phase permanent magnet linear motors, wherein the n + 1 traction converters comprise n independent traction converters and a multiplexing traction converter; the number of the independent traction convertersis the same as that of the three-phase permanent magnet linear motors; one side of each three-phase permanent magnet linear motor is connected with one independent traction converter; and the other side of each three-phase permanent magnet linear motor is connected with the multiplexing traction converter. Therefore, according to the semi-centralized open-winding primary permanent magnet linear motor traction system, the operating speed range of the primary permanent magnet linear motor is widened through the open-winding structure, and the number of traction converters is effectively reducedthrough the phase voltage bridge arm multiplexing technology.

Users in a medical mechanism can perform 360-degree rotation, zooming, whole observation and local observation operation for a primary tooth model through a three-dimensional digital primary tooth model processing module, and can load continuous physical parameters to clearly observe the important dynamic change process of eruption of the primary permanent teeth, primary permanent teeth root absorption, primary permanent teeth replacement and jaw development to search the development of the dental system and regulation and control thereof from a dynamic change rule to achieve the purposes of research and learning of mechanism and running conditions of each part of child deciduous teeth, understand the lesion data of each data of the child deciduous teeth through a pathological file storagemodule, input the pathological manifestations through a pathological data search analysis module and search and analyze pseudo disease cases.

The invention discloses a double modulation alternating pole permanent magnet cursor motor and application thereof. The cursor motor comprises a primary core; an armature winding is arranged in each open slot of the primary core; and the same sides of the armature windings are provided with primary permanent magnets with a uniform magnetization direction; and the magnetization direction of the permanent magnets is parallel to the direction of movement of the primary core, thereby forming a first alternating pole permanent magnet excitation array. The cursor motor also comprises a secondary core arranged parallel to the primary core at an interval and located on the slot side the primary core. The primary core and the secondary core can move relative to each other. The secondary core is provided with a plurality of open slots at intervals relative to the surface of the primary core, and secondary permanent magnets are arranged in the open slots. The magnetization direction of the secondary permanent magnets is perpendicular to the direction of movement of the primary core, thereby forming a second alternating pole permanent magnet excitation array; and the first and second alternating pole permanent magnet excitation arrays are matched in terms of magnetization direction. The secondary motor of the invention adopts the array of alternating pole permanent magnets, so that the amount of permanent magnets can be greatly reduced compared with a conventional secondary surface-mount permanent magnet linear motor, which significantly reduces the cost of the motor.

The invention provides a low-thrust ripple long primary permanent magnet synchronous linear motor, and belongs to the technical field of motors. The motor includes a primary assembly and a secondary assembly. The primary assembly is used as a stator and is composed of a primary iron core and armature windings. The longitudinal length of the primary assembly is much greater than that of the secondary assembly. Grooves are formed in the primary iron core, and the armature windings are arranged inside the grooves. The secondary assembly is used as a mover and is composed of permanent magnets anda secondary iron core. A magnetic isolation region is arranged in the middle of the secondary iron core. The distance between the permanent magnets is not affected by the magnetic isolation region. There is an air gap between the primary assembly and the secondary assembly. The structure is beneficial for suppressing the end effect and cogging effect of the motor and reducing the thrust ripple inthe long primary permanent magnet synchronous linear motor.

The invention discloses a primary permanent magnet bilateral linear magnetic field modulation motor and a low magnetic resistance design method thereof. The motor structure comprises two secondary poles which are only composed of salient pole teeth and a primary pole which is provided with permanent magnets and armature windings. The upper secondary salient pole teeth and the lower secondary salient pole teeth are arranged oppositely, the salient pole teeth play a role in modulating a magnetic field, and the surface-mounted permanent magnets with the same excitation directions are arranged atthe tooth crest of a primary single-side armature at intervals. Meanwhile, the permanent magnets at the two sides of the primary pole are staggered, a primary iron core adopts the modular design, andeach primary module is only composed of long-strip-shaped armature teeth. Semi-closed armature grooves or closed grooves are formed between every two adjacent modules, and the armature windings are arranged in the grooves, so that the machining difficulty of the motor can be effectively reduced. Meanwhile, with the arrangement design of the permanent magnets and the secondary modulation teeth, a magnetic flux path can be effectively simplified, the magnetic resistance on the magnetic flux path can be reduced, the magnetic field amplitude of the motor can be increased, the torque performance can be improved, and the application prospect is wider.

A primary permanent magnet maglev linear motor is disclosed, consisting of primary and secondary components, Between primary and secondary there is an air gap, the length of the secondary is greater than that of the primary, the primary is composed of n armature modules, n+1 suspension module and 2n magnetic barrier, n is a positive integer and n is equal to or greater than 3, and a first suspension module, a first magnetic barrier, a first armature module, a second magnetic barrier, a second suspension module, a third magnetic barrier, a second armature module, a fourth magnetic barrier, a third suspension module,..., an nth suspension module, a 2nth suspension module and n+1th suspension module are sequentially arranged in a primary stage. The linear motor realizes the decoupling of thesuspension magnetic field and the armature magnetic field, and the magnetic conductance of the magnetic circuit through which the suspension winding magnetic field passes is independent of the secondary position, so that the levitation force control of the linear motor does not need to know the secondary position information, and the control system is greatly simplified.