30 results about "Linear induction motor" patented technology

The invention provides an electromagnetic quasi-zero stiffness vibration isolation device and method based on a composite nested structure, and belongs to the technical field of vibration isolation. The device comprises a supporting base, two linear induction motor assemblies symmetrically arranged on the base and provided with a preset gap, and a suspension supporting frame composed of a vertical conductive supporting plate and a horizontal magnetic conductive supporting plate. The vertical conductive supporting plate can float up and down in the gap and forms a positive stiffness module for providing main supporting force and positive stiffness with the motor assembly, and the two eddy current stator pairs are symmetrically distributed on the left side and the right side of the horizontal magnetic conductive supporting plate and form a negative stiffness module for providing negative stiffness with the horizontal magnetic conductive supporting plate; each eddy current stator pair comprises an upper eddy current stator assembly and a lower eddy current stator assembly which are mutually exclusive up and down and float on the upper side and the lower side of the horizontal magnetic conductive supporting plate; the positive and negative stiffness modules are coaxially arranged and cooperate in parallel through a composite nested structure to realize the quasi-zero stiffness characteristic; the rigidity can be dynamically adjusted, and the vibration isolation effect and reliability are improved.

The invention relates to a joining tool (10) for connecting at least two elements (36, 38) by driving in a connecting element in the form of a self-piercing rivet (34), comprising a drive (14) which is designed to generate an axial force in order to drive the self-piercing rivet (34) into the elements (36, 38) to be connected; and an actuator (22) which is designed to apply the force generated by the drive (14) to the self-piercing rivet (34); wherein the joining tool (10) comprises a linear induction motor (14) as a drive (14). The invention also relates to a method for connecting at least two elements (36, 38) by driving in a self-piercing rivet (34), wherein the self-piercing rivet (34) is driven into the elements (36, 38) to be connected by applying an axial force to the self-piercing rivet (34), wherein the axial force is generated by a linear induction motor (14).

A conveyor system for transporting goods within a warehouse facility. The system includes an array of guide tracks and carriages moveable along the guide tracks for transporting goods within the warehouse facility. A drive system includes drivers spaced along the guide tracks. The drivers may utilize linear induction motors, propels the carriages along the guide tracks. The linear induction motors utilize stepper motors, and optionally microstepping motors. A warehouse management system controls the linear drive system to transport goods throughout warehouse facility for storage and order fulfilment. The linear driver conveyor system includes perpendicular transfers at which carriages can be transferred from one conveyor line to another, without the need for mechanical processes, such as lift or buffers, to move the carriage between conveyor lines.

The application relates to a conjugate double-sided magnetic field linear induction motor and an assembling method thereof. The conjugate double-sided magnetic field linear induction motor comprises conjugate winding primaries and composite secondaries, and a group of composite secondaries are arranged on opposite sides of the conjugate winding primaries respectively. The composite secondary comprises a back iron and a squirrel cage embedded in the back iron, and the squirrel cages of the two groups of composite secondaries are oppositely arranged. According to the conjugate double-sided magnetic field linear induction motor, a group of composite secondaries are arranged on opposite sides of the conjugate winding primaries respectively, and the multi-phase conjugate winding primary generates a double-sided conjugate symmetrical air gap magnetic field when the motor is powered and operated, the air gap magnetic field interacts with the double-sided composite secondary to generate electromagnetic force, and the air gap magnetic field utilization rate and the thrust density are higher.

A linear induction motor system for levitating a vehicle is disclosed herein The linear induction motor system comprises a linear induction motor. The linear induction motor comprises a back iron and a reaction rail adjacent to the back iron. The linear induction motor further comprises a primary separated from the reaction rail by a gap. The linear induction motor system further comprises a rear appendix adjacent to the primary, wherein the rear appendix generates magnetic poles in the primary in response to a magnetic flux density in the reaction rail and back iron.

A polyphase linear induction motor including a movable primary member (100), the primary member (100) including a magnetic material (110), a polyphase winding (120) arranged around the magnetic material, and a stationary longitudinally-extending secondary member (150) separated from the primary member (100) by a gap, the secondary member (150) including an electrically-conductive reaction plate (200) and a backing magnetic material (300), wherein the secondary member includes a middle section (205) and two outer sections (210.1, 210.2), the middle section (205) and the two outer sections (210.1, 210.2) arranged next to each other in parallel to an axis of longitudinal extension of the reaction plate (200).

The application provides an electromagnetic quasi-zero stiffness vibration isolation device and method based on a composite nested structure, and belongs to the technical field of vibration isolation. The device comprises a supporting base, two linear induction motor assemblies symmetrically arranged on the base and provided with a preset gap, and a suspension support frame composed of a vertical conductive support plate and a horizontal magnetic conductive support plate. The vertical conductive support plate can float up and down in the gap and forms a positive stiffness module with the motor assembly to provide a main supporting force and positive stiffness. Two pairs of symmetrical electric eddy current stator pairs are distributed on the left and right sides of the horizontal magnetic conductive support plate and form a negative stiffness module with the horizontal magnetic conductive support plate to provide negative stiffness. Each pair of electric eddy current stator pairs comprises an upper electric eddy current stator assembly and a lower electric eddy current stator assembly which are mutually repulsive and float up and down on the left and right sides of the horizontal magnetic conductive support plate. The positive and negative stiffness modules are coaxially arranged and are connected in parallel through a composite nested structure to realize the quasi-zero stiffness characteristic. The application can realize dynamic stiffness adjustment, improve the vibration isolation effect and reliability.

A conveyor belt driven by linear motors distributed along the belt, rather than at the head thereof. These linear electric motors or of the induction type with a short primary (5) having two action sides and a long secondary (2) made of plates (8; 12) of conducting material, such as aluminium or copper. The secondary (2) plates (8; 12) are vertically fixed in the central portion of the rubber belt (1) or metal plates (22). The invention is equipped with split central load rollers (14) and return drums (3) with grooves (11) accommodating the passage of the secondary plates (8; 12) during the belt (1) path.

This invention discloses a method for obtaining parameters of a stationary linear induction motor based on the finite element method. The motor's rotor is stationary, and the method can account for the magnetic saturation of the primary core and secondary yoke. It is applicable to both short-primary and long-primary linear induction motors. First, the induction plate of the secondary winding is removed from the calculation model. Under current source excitation mode, an AC current with a preset current and frequency is applied to the input terminal of the primary winding. The current magnitude is varied, and the total equivalent resistance, reactance, and maximum air gap normal magnetic flux density of the motor are obtained under different current inputs. Then, the induction plate of the secondary winding is restored to the calculation model. Under current source excitation mode, an AC current with a preset current and frequency is applied to the input terminal of the primary winding, and the total equivalent resistance, reactance, and maximum air gap normal magnetic flux density of the motor are obtained. Finally, based on the above calculated values, the parameters in the T-type equivalent circuit of the induction motor are calculated.

The invention provides a linear propulsion device, a high-temperature superconducting maglev traffic structure and a control method, and relates to the technical field of maglev traffic, the linear propulsion device comprises a permanent magnet array, the permanent magnet array is laid in the extending direction of rails, and two power supply rails are arranged in the width direction of the permanent magnet array. The two power supply rails are connected with the positive electrode and the negative electrode of a power source correspondingly, and the sliding piece is suitable for being fixedly connected with a vehicle body and is in sliding connection and conduction with the power supply rails. The magnetic field of the permanent magnet array is utilized, the sliding part and the power supply rail are slidably connected and conducted, so that the sliding part can move in the extending direction of the rail, the vehicle body can move along the rail, and compared with a short-stator linear induction motor and a long-stator linear synchronous motor, the motor is low in cost and high in driving efficiency.

The application discloses a kind of excitation inductance identification method, current control method and system of linear induction motor, belong to linear motor control technical field;In each control cycle, with back electromotive force as observation, the reference model based on sliding mode observer is constructed to calculate back electromotive force observation value, and adjustable model containing excitation inductance is used to calculate back electromotive force, and the adaptive rate of excitation inductance and back emf error is calculated to calculate the corresponding excitation inductance, to realize the identification of excitation inductance.The application constructs reference model irrelevant to the change of excitation inductance, and uses sliding mode instead of current differential term, eliminates the noise caused by current differential term in existing reference model, avoids the interference of current noise on back emf observation result, improves the accuracy of excitation inductance identification;On this basis, the inherent chattering problem of sliding mode observer is further eliminated by using cascaded low-pass filter, and the accuracy of excitation inductance identification is further improved.

This invention discloses a flat-type moving primary linear induction motor, comprising a motor base, a motor stator assembly, a mover assembly, a power supply device, and a guiding device. The motor stator assembly is vertically fixed within the hollow frame of the motor base. Multiple vertically arranged guide rails are fixedly arranged on the left and right sides of the motor stator assembly. Multiple sliding contact line structures are arranged on the vertical inner wall of the motor stator assembly frame. The mover assembly includes a mover frame sleeved around the outer periphery of the motor stator assembly and a mover winding fixedly mounted in the middle of the mover frame. A sliding groove is provided on the mover frame. The guide rails are inserted into the sliding grooves, allowing the mover frame to move axially along the guide rail direction due to the constraint of the sliding grooves. Collectors are installed on the left and right sides of the mover frame, and the mover winding is powered by sliding contact through the collectors and the sliding contact line structures. This invention features high thrust density, compact structure, low cost, reliable operation, and convenient maintenance, and can be applied to high-thrust acceleration fields.

This invention provides a sensorless control method for a piecewise linear induction motor based on an extended state observer phase-locked loop (PLL), belonging to the field of motor control technology. The method includes: constructing an equivalent mathematical model of the piecewise linear induction motor without coupling coefficient terms; constructing a sliding mode observer based on an integral sliding surface combined with an exponential reaching law to obtain the back electromotive force (EMF) observation value required by the PLL; inputting the back EMF observation value into the PLL based on the extended state observer to extract the synchronous angular velocity and synchronous electrical angle, and calculating the secondary velocity estimate and secondary displacement estimate; feeding back the synchronous angular velocity, secondary velocity estimate, and secondary displacement estimate to the closed-loop control system to achieve sensorless operation of the piecewise linear induction motor. This invention can improve the speed and position estimation accuracy of the system under high dynamic conditions, and enhance the system's robustness and dynamic response performance.

The invention provides a pinning magnetic levitation magnetic track driving device, a traffic structure and a control method, and relates to the technical field of magnetic levitation traffic, the driving device comprises a permanent magnet, and the permanent magnet is laid in the extending direction of a track; the conductor piece is arranged at the top of the permanent magnet, and the extension direction of the conductor piece is parallel to the extension direction of the permanent magnet; and the power supply assembly is suitable for being fixedly connected with a vehicle body, and the power supply assembly is in sliding connection with the conductor piece and is conducted with the conductor piece. The magnetic field of the permanent magnet is utilized, and the power supply assembly and the conductor piece are slidably connected and conducted, so that the power supply assembly can move in the extending direction of the track, the vehicle body can move along the track, and compared with a short-stator linear induction motor and a long-stator linear synchronous motor, the motor is low in cost and high in driving efficiency.

The application discloses a magnetic suspension conveying device, which comprises a base, a conveying belt, a linear induction motor, a first magnet group and a second magnet group. The conveying belt is sleeved outside the base and comprises a plurality of bearing plates, which are annularly distributed and connected through hinging. The linear induction motor is used for driving the conveying belt to rotate around the base and comprises an induction primary and an induction secondary. The induction primary is installed on the base, and the induction secondary is a bearing plate or is installed on the bearing plate. The first magnet group is used for applying a thrust away from the base to the bearing plate, and the second magnet group is used for applying a lateral thrust to the bearing plate. The second magnet group comprises two groups, and the two groups of the second magnet group are respectively located on the lateral sides of the bearing plate to limit the bearing plate on the lateral sides. Compared with the prior art, the magnetic suspension conveying device can reduce friction loss, thereby prolonging the service life of the device.

The invention provides a linear induction motor with a low transverse end effect and a cell secondary structure, the linear induction motor is composed of a bilateral long primary and short secondary plates, the long primary adopts a bilateral parallel arrangement mode, and the short secondary plates are formed by a high-strength good-conductivity non-magnetic material and are symmetrically arranged in the middle of an air gap of the bilateral primary. Non-penetrating grooves are evenly formed in the two faces of each short secondary plate to form a grid groove structure, the length of each secondary plate is larger than that of a single primary, the length Lc of each groove is smaller than the width of each secondary and larger than the stacking thickness of a primary iron core, and the proposed secondary plate design can effectively standardize a secondary eddy current path, remarkably reduce the transverse end effect and remarkably improve the thrust performance of the motor. Meanwhile, due to the fact that the grooves are designed in a non-penetrating mode, secondary stress can be evenly distributed, the secondary structural strength is improved, and the structure is particularly suitable for large-power, large-thrust and ultra-high-speed application occasions.

The invention discloses a multi-motor cooperative minimum loss control method and system for linear induction motors, and belongs to the technical field of linear motor control. The method comprises the following steps: deducing a function relationship between thrust and total loss of a plurality of motors under the control of minimum loss according to a relationship between a primary flux linkage and loss of a single motor; defining a thrust distribution coefficient, and establishing a multi-motor thrust-total loss optimization model comprising a total thrust constraint, a thrust constraint of each motor, a voltage constraint and a normal force difference constraint of adjacent motors; taking the thrust distribution coefficient as an optimization variable, and adopting a sequential quadratic programming method to carry out optimization distribution on each motor thrust instruction; and finally, according to the optimized thrust instruction of each motor, realizing thrust tracking and loss regulation and control of each motor in combination with a single-motor minimum loss control strategy. According to the invention, cooperative minimum loss control from a single-machine system to a multi-machine system is realized, and the overall operation efficiency of the multi-motor system is effectively improved.

The invention discloses a linear motor iron core structure and a linear induction motor. The linear motor iron core structure comprises a frame, a linear iron core and a dovetail plate, the linear iron core comprises an iron core punching sheet, a plurality of dovetail grooves are formed in the top of the iron core punching sheet, through holes are symmetrically formed in the two ends of the upper portion of the dovetail plate, a plurality of connecting holes are formed in the side portion of the frame, the lower portion of the dovetail plate is embedded in the dovetail grooves, the upper portion of the dovetail plate is embedded in the frame, and fasteners are screwed into the through holes and the connecting holes. And the upper part of the dovetail plate is fixedly connected with the frame. The linear induction motor has the advantages of being compact in structure, high in supporting strength, high in reliability and the like, stress concentration can be reduced, and the running safety of the linear induction motor is improved.

The invention belongs to the technical field of motor control, particularly relates to a segmented linear induction motor thrust optimization control method based on a stator reconstruction identification model, and aims to solve the problem of thrust output reduction caused by parameter change of a segmented linear motor in short-time ultrahigh-speed operation. The method comprises the following steps: defining a stator length coefficient of an uncovered area of a rotor, and carrying out weighted average on segmented stator current to generate virtual stator current; a first-order low-pass filter is adopted to observe voltage of a non-coverage section, compensation reconstruction is carried out on voltage of a power supply section in combination with a length coefficient to obtain equivalent stator voltage, the equivalent stator voltage and virtual current are input into a reference model and an adjustable model respectively, and a rotor resistance identification value is generated through flux linkage errors of the equivalent stator voltage and the virtual current via a PI controller. And calculating the change rate of the identification value relative to the initial value, and synchronously adjusting the slip frequency given value to realize motor thrust optimization. According to the invention, the problem that the thrust output is reduced due to parameter change of the segmented linear motor in short-time ultrahigh-speed operation is effectively solved.

The application discloses an electric magnetic suspension tracked vehicle chassis, which comprises a vehicle body, a track assembly, a load wheel, a linear induction motor, a roller and a magnet assembly. The track assembly comprises a track plate. The linear induction motor is used for driving the track assembly to rotate, and the linear induction motor comprises an induction primary and an induction secondary. The induction primary is installed on the vehicle body, and the induction secondary is installed on the track plate. The roller is rotatably installed on the vehicle body and used for rolling contact with the side of the track plate close to the induction primary, so that the induction primary is prevented from contacting the track plate or the induction secondary. The magnet assembly is used for supporting the vehicle body, and the magnet assembly comprises a first magnet installed on an axle of the load wheel and a second magnet installed on the track plate. The second magnet on the lower track plate repels the first magnet in a magnetic manner when the two magnets are close to each other. Compared with the prior art, the electric magnetic suspension tracked vehicle chassis can reduce friction loss and improve energy utilization efficiency.

The invention provides a modular power supply system for an ultra-high-speed long-primary bilateral linear induction motor, which belongs to the technical field of electromagnetic emission and comprises the ultra-high-speed long-primary bilateral linear induction motor, a traction converter and a connecting bus. The ultra-high-speed long-primary bilateral linear induction motor comprises a rotor and a long-primary track composed of a plurality of motor modules, and the motor modules are formed by series-parallel connection of different pole pairs according to the moving track of the rotor. The total primary voltage and the primary current of a pair of poles of each motor module are respectively equal to the working voltage and the working current of a switching device in the traction converter, and the number of parallel pole pairs of the motor modules corresponds to the number of parallel groups of the traction converter; the traction converters are arranged nearby the motor modules, and the motor modules and the traction converters are connected through connecting buses in a one-to-one correspondence mode. The method solves the problems that the bus voltage drop is large, a switching device in a traction converter is not matched and the efficiency of an overall electromagnetic emission system is low due to the fact that centralized power supply and segmented power supply are adopted in a traditional method.

The application discloses an electric double-primary direct-drive caterpillar chassis, and relates to the technical field of caterpillar vehicles, comprising a double-side linear induction motor primary and a composite caterpillar, wherein the double-side linear induction motor primary and the composite caterpillar are arranged on a chassis body, the double-side linear induction motor primary comprises a winding, the winding is used for connecting an alternating-current power supply, the composite caterpillar passes through the winding, and the double-side linear induction motor primary drives the composite caterpillar to move. After alternating current is input into the double-side linear induction motor primary, a traveling wave magnetic field is generated, the composite caterpillar induces current in the traveling wave magnetic field, and the current is forced in the magnetic field, so that the composite caterpillar obtains traction. The application directly adopts the linear induction motor to drive the composite caterpillar, omits a mechanical transmission link and a driving wheel, obtains a larger carrying space and a more flexible power cabin arrangement, and reduces transmission wear and tear, faults and mechanical noise.

The utility model relates to the technical field of magnetic suspension, and aims to solve the problems that the layout mode that a suspension electromagnet and a linear induction motor of a traditional magnetic-levitation train are independent of each other occupies a large space, and the normal force of the linear induction motor has a negative effect on the suspension force. The utility model provides a magnetic-levitation train traction suspension combined type induction rail and a traction suspension system electromagnetic structure. The traction suspension combined type induction rail comprises an electromagnet induction rail body, the electromagnet induction rail body is arranged below a track beam in the line direction, protrusions are downwards formed on the two sides of the electromagnet induction rail body, the end faces of the protrusions are the pole faces of the electromagnet induction rail body, and an installation cavity is formed between the protrusions on the two sides. A mounting rail is arranged in the mounting cavity, and the mounting rail is connected with the electromagnet induction rail; a plane is formed at the bottom of the mounting rail and is a secondary mounting surface of the linear induction motor; according to the utility model, the occupied space can be reduced, and the suspension performance of the vehicle can be improved.

The invention discloses a bifurcation chaos stability analysis method for a high-speed linear induction motor. The bifurcation chaos stability analysis method comprises the following steps: S1, establishing a complex vector mathematical model of the high-speed linear induction motor under PI control; s2, exporting a state-space equation of the system based on the complex vector mathematical model; s3, solving the state-space equation to obtain a balance point of the system; s4, judging the local stability of the balance point obtained in the step S3; s5, identifying global bifurcation characteristics and chaotic dynamics behaviors of the system; s6, determining a stability domain boundary of the proportional-integral control parameters; and S7, analyzing the stability of the high-speed linear induction motor based on bifurcation chaos. According to the method, dynamic behaviors of the system are analyzed through numerical solution, the defect that a traditional transfer function method is insufficient in non-linear and time-varying parameter sensitivity problem analysis capacity is overcome, and a more accurate theoretical basis is provided for stable control of the motor under the ultra-high-speed working condition.

The application provides a kind of maglev train non-contact linear drive device, relating to the technical field of suspended train, including rotor, rotor is suitable for rotationally connected with car body, rotor includes permanent magnet;Stator is suitable for fixedly connected with car body, stator is set to the side of rotor away from car body and forms first air gap with rotor, stator includes energized coil, the projection of stator in vertical direction overlaps at least a part of rotor;Conductor plate is laid along the track extension direction and forms second air gap with rotor, the projection of conductor plate in vertical direction overlaps at least another part of rotor.The application realizes force transmission by magnetic field effect, without physical contact, reduces wear and failure rate, and its permanent magnet excitation, compared with linear induction motor, significantly improves the power factor of driving device, reduces energy consumption, compared with linear synchronous motor, it only needs to lay passive conductor plate on the track, reduces the construction cost.

The invention provides a method for selecting current densities of different winding sections of a long-stator linear induction motor, and belongs to the field of design and manufacturing of linear induction motors. The method can be used for selecting the current density of different winding sections of the constant-acceleration long-stator linear induction motor in a segmented power supply mode of the long-stator linear induction motor. Comprising the following steps: on the basis of a common winding current density calculation method, introducing the influence of a resistance temperature rise effect and a skin effect generated under a high-frequency current; selecting skin effect use frequency under different parameter winding selection; mathematical derivation is carried out on the relation between the frequency and time of the long-stator linear induction motor under the constant acceleration; the linear induction motor in a segmented power supply mode is divided into different segments, and different current density selection methods are provided for segments corresponding to different frequencies. According to the method, the problem that large errors exist in current density selection link calculation in the design stage of the long-stator linear induction motor is solved.

The invention discloses an unequal-length segmented power supply linear induction motor modeling method and system, and belongs to the technical field of electric vehicle control, and the method comprises the steps: constructing a multi-segment coupling electromagnetic model, and according to the length difference of each stator segment; a dynamic weight factor is designed, and the magnetic field weight of each stator segment is adjusted through a smooth function according to the overlapping length of the rotor position and the segment boundary; learning edge force in real time based on a neural network, and outputting a compensation force coefficient to the mechanical dynamics model; the mechanical resonant frequency is monitored through a vibration sensor, and the equivalent stiffness is dynamically corrected. By means of the mode, the mechanical resonance frequency is monitored on line through the vibration sensor, the equivalent stiffness and the damping ratio of the system are dynamically adjusted in a closed-loop mode according to the mechanical resonance frequency, harmful resonance conditions can be effectively broken, the mechanical vibration amplitude is restrained at the low level, the mechanical structure is protected, and the stability margin of the control system is improved.

The invention discloses a linear induction motor full-speed-domain optimization control method based on an active flux linkage, and belongs to the technical field of linear motor control, and the method comprises the steps: sampling the state quantity of a motor system in real time, and determining a thrust reference value according to the sampling speed; reconstructing a primary voltage, and calculating an active flux linkage at the current moment according to the sampling current and the reconstructed voltage; according to the thrust reference value, motor active flux linkage amplitudes, phase voltages and efficacy under the three working conditions of the maximum thrust current ratio, the maximum power factor and the maximum thrust flux linkage ratio are calculated, and a reference active flux linkage amplitude used for motor control is determined; and determining a dq-axis current reference value according to the active flux linkage amplitude reference value, the actual value and the thrust reference value, and completing motor closed-loop control according to the current reference value and the actual value. According to the method, the parameter robustness of the observed flux linkage can be enhanced by defining the active flux linkage, and key indexes such as motor thrust and efficacy in full-speed-domain operation can be effectively improved by optimizing the value of the active flux linkage.

The linear actuator comprises a driving structure, the outer wall of the driving structure is fixedly connected with a guiding structure, the outer wall of the side, away from the driving structure, of the guiding structure is fixedly connected with a tensioning structure, and the inner wall of the guiding structure is slidably connected with a sliding structure and a synchronous belt; the two ends of the synchronous belt are fixedly connected with the sliding structures, and the inner wall of the synchronous belt is meshed with the outer walls of the driving structure and the tensioning structure; the utility model relates to the technical field of linear actuators, according to the guide structure and the sliding structure, through the matching design of the V-shaped guide rail and the idler wheel, the V-shaped inclined plane limits transverse deviation through bidirectional constraint, the motion resistance can be effectively reduced, meanwhile, the linear motion of the sliding seat can be ensured, and the magnetic strip at the top of the sliding rail tightly adsorbs a steel belt through magnetic force; a totally-closed protection structure is formed, impurities such as dust, water vapor and oil dirt can be effectively prevented from entering the sliding rail, and abrasion or clamping stagnation of core components such as the V-shaped guide rail and the synchronous belt caused by pollution is avoided.

The invention provides a non-contact linear driving device for a maglev train, and relates to the technical field of maglev trains, the non-contact linear driving device comprises a rotor, the rotor is suitable for being rotatably connected with a train body, and the rotor comprises a permanent magnet; the stator is suitable for being fixedly connected with a vehicle body, the stator is arranged on the side, away from the vehicle body, of the rotor, a first air gap is formed between the stator and the rotor, the stator comprises an electrified coil, and the projection of the stator in the vertical direction overlaps with at least one part of the rotor; the conductor plate is laid in the extending direction of the track, a second air gap is formed between the conductor plate and the rotor, and the projection of the conductor plate in the vertical direction is overlapped with at least the other part of the rotor. Force transmission is achieved through the action of a magnetic field, physical contact is not needed, abrasion and the failure rate are reduced, permanent magnet excitation is adopted, compared with a linear induction motor, the power factor of a driving device is remarkably improved, energy consumption is reduced, compared with a linear synchronous motor, only a passive conductor plate needs to be laid on a track, and the construction cost is reduced.