CN112671203A - High-speed linear electromagnetic propulsion and electromagnetic braking system - Google Patents
High-speed linear electromagnetic propulsion and electromagnetic braking system Download PDFInfo
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- CN112671203A CN112671203A CN202110062770.9A CN202110062770A CN112671203A CN 112671203 A CN112671203 A CN 112671203A CN 202110062770 A CN202110062770 A CN 202110062770A CN 112671203 A CN112671203 A CN 112671203A
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Abstract
The invention discloses a high-speed linear electromagnetic propulsion and electromagnetic braking system, belongs to the technical field of motors, and aims to solve the problems that an existing linear electromagnetic catapulting system of an unmanned aerial vehicle is poor in braking performance, low in reliability, incapable of realizing rotor resetting and the like. The electromagnetic brake system comprises a primary stage and a secondary stage, wherein the primary stage comprises an electromagnetic acceleration section and an electromagnetic braking section; the electromagnetic accelerating section and the electromagnetic braking section share a secondary, and the secondary is a rotor; the electromagnetic acceleration section is formed by driving an armature of the coreless linear permanent magnet synchronous motor; the electromagnetic braking section consists of an eddy current braking conductor plate and a braking coreless linear permanent magnet synchronous motor armature; the secondary is composed of two secondary and middle secondary arranged up and down or two secondary and middle secondary arranged left and right, and each secondary comprises a secondary yoke plate and a permanent magnet. The invention is used for electromagnetic ejection.
Description
Technical Field
The invention relates to a high-speed linear electromagnetic propulsion and electromagnetic braking system, and belongs to the technical field of motors.
Background
The electromagnetic launching technology of the unmanned aerial vehicle has the technical characteristics of low launching speed, large launching mass range, small launching kinetic energy, low launching frequency, small power supply, small acceleration, small current and the like, and compared with other electromagnetic launching technologies, the electromagnetic launching technology of the unmanned aerial vehicle has the advantages of reducing the technical requirements on the power supply, materials, switches and the like, and simultaneously, the low-speed advantage and the good inheritance of the electromagnetic launching technology of the unmanned aerial vehicle powerfully support the practicability of the electromagnetic launching of the unmanned aerial vehicle.
Fig. 1-3 are views of a linear electromagnetic ejection system for an unmanned aerial vehicle, wherein fig. 1 is a primary stage of a linear induction ejection motor, fig. 2 is a secondary stage of the linear induction ejection motor, and fig. 3 is a cross-section of the linear induction ejection motor. This straight line system of launching adopts long elementary, short secondary structure, and after elementary circular telegram, form straight line travelling wave magnetic field, this travelling wave magnetic field "cuts" secondary tablet, produces the electric current on secondary tablet, and induced-current and travelling wave magnetic field interact produce electromagnetic thrust on secondary tablet to the drive carries unmanned aerial vehicle's active cell accelerated motion, realizes unmanned aerial vehicle catapult-assisted take-off. After the unmanned aerial vehicle takes off, the secondary induction plate starts braking under the action of reverse braking force of the linear ejection motor, and finally the speed is reduced to zero. And finally, under the control of the linear ejection motor, resetting the secondary induction plate again to prepare for next emission.
Fig. 4 shows an electromagnetic ejection system of a permanent magnet linear motor type unmanned aerial vehicle, where the permanent magnet linear motor includes stator magnetic steel and rotor armatures, the left and right sides of the bottom surface of the supporting ejection platform of the unmanned aerial vehicle are both provided with linear sliders in sliding fit with the linear slide rails, the two rotor armatures are fixedly supported on the left and right sides of the bottom surface of the supporting ejection platform of the unmanned aerial vehicle through the linear sliders on both sides and linearly move along the linear slide rails along the linear sliders, and the stator magnetic steel arranged in a long straight line along the direction of the linear slide rails is fixed in the linear slide rails; after the unmanned aerial vehicle reaches the speed required by takeoff, the unmanned aerial vehicle supports the ejection platform to brake under the damping action of the braking system, and the unmanned aerial vehicle flies out in an inertial manner.
The linear electromagnetic ejection system of the unmanned aerial vehicle shown in fig. 1-3 adopts a linear induction motor to provide power, has the advantages of simple secondary structure, low cost and the like, but has the defects of low power factor of the motor, large capacity of a power converter, poor braking performance, low reliability and the like. The permanent magnet linear motor type unmanned aerial vehicle electromagnetic ejection system shown in fig. 4 has the advantages of low cost and the like, but has the defects of poor reliability, low thrust density, incapability of realizing mover reset and the like.
Disclosure of Invention
The invention aims to solve the problems that the existing linear electromagnetic catapulting system of the unmanned aerial vehicle is poor in braking performance and low in reliability, a rotor cannot be reset and the like, and provides a high-speed linear electromagnetic propelling and electromagnetic braking system.
The invention relates to a high-speed linear electromagnetic propulsion and electromagnetic braking system, which comprises a primary stage and a secondary stage, wherein the primary stage comprises an electromagnetic acceleration section and an electromagnetic braking section; the electromagnetic accelerating section and the electromagnetic braking section share a secondary, and the secondary is a rotor;
the electromagnetic acceleration section is formed by driving an armature of the coreless linear permanent magnet synchronous motor; the electromagnetic braking section consists of an eddy current braking conductor plate and a braking coreless linear permanent magnet synchronous motor armature;
the electromagnetic acceleration section is divided into n along the motion direction1Segment, n1Not less than 1; each section of the electromagnetic acceleration section comprises 2i units for driving an armature of the coreless linear permanent magnet synchronous motor, wherein i is more than or equal to 1;
the electromagnetic braking section is divided into n along the motion direction2Segment, n2Not less than 1; each section of the electromagnetic braking section comprises 2j units of eddy current braking conductor plates1，j1Not less than 0, each section of the electromagnetic braking section contains 2j units of braking coreless linear permanent magnet synchronous motor armature2，j2≥0，i≥j1+j2；
The secondary comprises 1 upper secondary, i-1 middle secondary, 1 lower secondary and i middle supporting plates;
the upper permanent magnet is fixed on the lower side of the upper secondary yoke plate;
the middle secondary comprises a middle secondary substrate and a middle permanent magnet, and the middle permanent magnet is fixed on the upper side and the lower side of the middle secondary substrate;
the lower secondary comprises a lower secondary yoke plate and a lower permanent magnet, and the lower permanent magnet is fixed on the upper side of the lower secondary yoke plate;
the upper permanent magnet, the middle permanent magnet and the lower permanent magnet respectively comprise two arrays of permanent magnets which are arranged in a bilateral symmetry mode, and the permanent magnets of each array are sequentially and alternately arranged in N, S mode along the moving direction;
the upper secondary, the middle secondary and the lower secondary are sequentially arranged in parallel and connected through a middle supporting plate which is vertically arranged; the middle support plate is positioned between the left array and the right array of the upper permanent magnet, the middle permanent magnet and the lower permanent magnet;
the magnetizing directions of the permanent magnets at the corresponding positions of the upper secondary, the middle secondary and the lower secondary are the same, so that a series magnetic circuit is formed;
the 2i units for driving the coreless linear permanent magnet synchronous motor armature are divided into a left group and a right group which are symmetrically arranged, windings at corresponding positions of the left group and the right group of units are connected in series, when the secondary is coupled with the electromagnetic acceleration section, the units for driving the coreless linear permanent magnet synchronous motor armature are respectively positioned among 1 upper secondary, i-1 middle secondary and 1 lower secondary, air gaps are formed among the units for driving the coreless linear permanent magnet synchronous motor armature, the upper secondary, the middle secondary and the lower secondary, and the plane where the air gaps are positioned is parallel to the motion direction;
2j1unit of eddy current brake conductor plate and 2j2The units of the armature of the braking coreless linear permanent magnet synchronous motor are divided into a left group and a right group which are symmetrically arranged, when the secondary is coupled with the electromagnetic braking section, the units of each eddy current braking conductor plate and the units of the armature of the braking coreless linear permanent magnet synchronous motor are respectively positioned among 1 upper secondary, i-1 middle secondary and 1 lower secondary, air gaps are formed among the units of each eddy current braking conductor plate and the units of the armature of the braking coreless linear permanent magnet synchronous motor, the upper secondary, the middle secondary and the lower secondary, and the plane where each air gap is positioned is parallel to the movement direction.
The invention relates to a high-speed linear electromagnetic propulsion and electromagnetic braking system, which comprises two primary stages and a secondary stage, wherein the primary stage comprises an electromagnetic acceleration section and an electromagnetic braking section; the electromagnetic accelerating section and the electromagnetic braking section share a secondary, and the secondary is a rotor;
the electromagnetic acceleration section is formed by driving an armature of the coreless linear permanent magnet synchronous motor; the electromagnetic braking section consists of an eddy current braking conductor plate and a braking coreless linear permanent magnet synchronous motor armature;
the electromagnetic acceleration section is divided into n along the motion direction1Segment, n1Not less than 1; each section of the electromagnetic acceleration section comprises 2i units for driving an armature of the coreless linear permanent magnet synchronous motor, wherein i is more than or equal to 1;
the electromagnetic braking section is divided into n along the motion direction2Segment, n2Not less than 1; each section of the electromagnetic braking section comprises 2j units of eddy current braking conductor plates1，j1Not less than 0, each section of the electromagnetic braking section contains 2j units of braking coreless linear permanent magnet synchronous motor armature2，j2≥0，i≥j1+j2；
The secondary comprises an upper secondary, i-1 middle secondary, a lower secondary, i left middle support plates and i right middle support plates;
the last stage comprises a symmetrically arranged upper left secondary and upper right secondary,
the upper left secondary comprises an upper left yoke plate and an upper left permanent magnet, the upper left permanent magnet is arranged on the lower side of the upper left yoke plate,
the upper right secondary comprises an upper right yoke plate and an upper right permanent magnet, the upper right permanent magnet is arranged on the lower side of the upper right yoke plate,
the middle secondary is divided into a left middle secondary and a right middle secondary which are symmetrically arranged and have the same structure, and comprises a middle secondary substrate and a middle permanent magnet, the middle permanent magnet is arranged on the upper side and the lower side of the middle secondary substrate,
the lower secondary comprises a lower left secondary and a lower right secondary which are symmetrically arranged,
the lower left secondary comprises a lower left yoke plate and a lower left permanent magnet, the lower left permanent magnet is arranged on the upper side of the lower left yoke plate,
the lower right secondary comprises a lower right yoke plate and a lower right permanent magnet, the lower right permanent magnet is arranged on the upper side of the lower right yoke plate,
the upper left permanent magnet, the upper right permanent magnet, the middle permanent magnet, the lower left permanent magnet and the lower right permanent magnet are sequentially and alternately arranged at N, S along the motion direction;
the upper secondary, the middle secondary and the lower secondary are arranged in parallel, the left sides of the upper left secondary, the left middle secondary and the lower left secondary are connected through a vertically arranged left middle support plate, the right sides of the upper right secondary, the right middle secondary and the lower right secondary are connected through a vertically arranged right middle support plate, an upper left yoke plate and an upper right yoke plate are connected, a gap is formed between the left middle secondary and the right middle secondary, and a gap is formed between the lower left secondary and the lower right secondary;
the magnetizing directions of the permanent magnets at the corresponding positions of the upper secondary, the middle secondary and the lower secondary are the same, so that a series magnetic circuit is formed;
the two primary stages are arranged between the upper secondary stage and the lower secondary stage, an upper air gap is formed between one primary stage and the upper secondary stage, a lower air gap is formed between the other primary stage and the lower secondary stage, and the planes of the upper air gap and the lower air gap are parallel to the motion direction;
the 2i units for driving the armature of the coreless linear permanent magnet synchronous motor are divided into a left group and a right group which are coplanar and symmetrically arranged, the units of the armature of the coreless linear permanent magnet synchronous motor at the corresponding positions of the left group and the right group of units are connected, windings at the corresponding positions of the left group and the right group of units are connected in series, when the secondary is coupled with the electromagnetic acceleration section, the units for driving the armature of the coreless linear permanent magnet synchronous motor are respectively positioned among the upper secondary, the i-1 middle secondary and the lower secondary, air gaps are formed among the units for driving the armature of the coreless linear permanent magnet synchronous motor, the upper secondary, the middle secondary and the lower secondary, and the plane where the air gaps are positioned is parallel to;
2j1unit of eddy current brake conductor plate and 2j2The units of the armature of the braking coreless linear permanent magnet synchronous motor are divided into a left group and a right group which are symmetrically arranged, the units of the eddy current braking conductor plates at the corresponding positions of the left group and the right group of units are connected, the units of the armature of the braking coreless linear permanent magnet synchronous motor at the corresponding positions of the left group and the right group of units are connected, when the secondary is coupled with the electromagnetic braking section, the units of each eddy current braking conductor plate and the units of the armature of the braking coreless linear permanent magnet synchronous motor are respectively positioned between the upper secondary, the i-1 middle secondary and the lower secondaryAir gaps are formed among the units of the eddy current braking conductor plates and the units of the braking coreless linear permanent magnet synchronous motor armature, the upper secondary, the middle secondary and the lower secondary, and the plane where each air gap is located is parallel to the motion direction.
The invention relates to a high-speed linear electromagnetic propulsion and electromagnetic braking system, which comprises a primary stage and a secondary stage, wherein the primary stage comprises an electromagnetic acceleration section and an electromagnetic braking section; the electromagnetic accelerating section and the electromagnetic braking section share a secondary, and the secondary is a rotor;
the electromagnetic acceleration section is formed by driving an armature of the coreless linear permanent magnet synchronous motor; the electromagnetic braking section consists of an eddy current braking conductor plate and a braking coreless linear permanent magnet synchronous motor armature;
the electromagnetic acceleration section is divided into n along the motion direction1Segment, n1Not less than 1; each section of the electromagnetic acceleration section comprises i units for driving an armature of the coreless linear permanent magnet synchronous motor, wherein i is more than or equal to 1;
the electromagnetic braking section is divided into n along the motion direction2Segment, n2Not less than 1; each segment of the electromagnetic braking section comprises a number j of units of eddy current braking conductor plates1，j1Not less than 0, the number of units of each section of the electromagnetic braking section containing the armature of the braking coreless linear permanent magnet synchronous motor is j2，j2≥0，i≥j1+j2；
The secondary comprises 1 left secondary, i-1 middle secondary, 1 right secondary and i middle supporting plates;
the left secondary comprises a left secondary yoke plate and a left permanent magnet, and the left permanent magnet is fixed on the right side of the left secondary yoke plate;
the middle secondary comprises a middle secondary substrate and a middle permanent magnet, and the middle permanent magnet is fixed on the left side and the right side of the middle secondary substrate;
the right secondary comprises a right secondary yoke plate and a right permanent magnet, and the right permanent magnet is fixed on the left side of the right secondary yoke plate;
the left permanent magnet, the middle permanent magnet and the right permanent magnet are sequentially and alternately arranged at N, S along the motion direction;
the left secondary, the middle secondary and the right secondary are sequentially arranged in parallel, and the upper sides of the left secondary, the middle secondary and the right secondary are connected through a middle supporting plate; the middle support plate is positioned among the left permanent magnet, the middle permanent magnet and the right permanent magnet;
the magnetizing directions of the permanent magnets at the corresponding positions of the left secondary, the middle secondary and the right secondary are the same, so that a series magnetic circuit is formed;
when the secondary is coupled with the electromagnetic acceleration section, the i units for driving the armature of the coreless linear permanent magnet synchronous motor are respectively positioned among the left secondary, the i-1 middle secondary and the right secondary, air gaps are formed among the units for driving the armature of the coreless linear permanent magnet synchronous motor, the left secondary, the middle secondary and the right secondary, and the plane where the air gaps are positioned is parallel to the motion direction and is vertical to the horizontal plane;
when the secondary is coupled to the electromagnetic braking section, j1Unit of eddy current brake conductor plate and j2The units for braking the armature of the coreless linear permanent magnet synchronous motor are respectively positioned among the left secondary, the i-1 middle secondary and the right secondary, air gaps are formed among the units for braking the conductor plate by eddy current and the units for braking the armature of the coreless linear permanent magnet synchronous motor, the left secondary, the middle secondary and the right secondary, and the plane where each air gap is positioned is parallel to the motion direction and is vertical to the horizontal plane.
According to the high-speed linear electromagnetic propulsion and electromagnetic braking system, the electromagnetic acceleration section adopts the coreless linear permanent magnet synchronous motor to provide acceleration electromagnetic force, and the electromagnetic braking section adopts the linear eddy current brake and the coreless linear permanent magnet synchronous motor to provide deceleration braking force. Has the following advantages:
1. the electromagnetic acceleration section adopts an iron-core-free linear permanent magnet synchronous motor, and the motor has the advantages of high power factor, high efficiency, small volume, light weight and small inverter capacity.
2. The linear permanent magnet synchronous motor adopts an iron-core-free armature at the primary stage, eliminates the influence of iron core saturation and armature reaction, and has strong overload capacity, high thrust density and small thrust fluctuation of the system. Meanwhile, the system has small vibration and low noise.
3. The linear permanent magnet synchronous motor adopts an iron-cored armature at the primary stage, and when the linear permanent magnet synchronous motor needs long-stroke acceleration, the total weight of the system is light, so that the linear permanent magnet synchronous motor is particularly suitable for being used on mobile platforms such as ships and vehicles.
4. The linear eddy current brake has high braking force density and reliable braking; the braking coreless linear permanent magnet synchronous motor not only participates in braking, can adjust the braking force, controls the braking acceleration within a reasonable range, but also can compensate the braking force fluctuation. Meanwhile, after braking is finished, the rotor can be driven to return to the electromagnetic acceleration section, so that the rotor is reset and preparation is made for the next working cycle.
5. The coreless armature linear motor has no normal force, the horizontal air gap arrangement and installation of the linear eddy current brake eliminates the transverse force, the rotor support structure is simple and reliable, and the friction loss is low.
6. The coreless armature linear motor and the eddy current brake adopt a bilateral structure, the secondary normal force of the linear motor is mutually counteracted, and the primary normal force and the secondary normal force of the eddy current brake are mutually counteracted, so that the secondary structure can be simplified, the secondary weight can be reduced, and the load capacity of the system is strong.
7. The system is easy to realize modularization, and when the output thrust and the braking force are required to be improved, the number of the primary units and the number of the intermediate secondary units are increased along the vertical direction.
The high-speed linear electromagnetic propulsion and electromagnetic braking system has the advantages of high power factor, high efficiency, small volume, light weight and small inverter capacity; the system has strong overload capacity, high thrust density, small thrust fluctuation, small vibration and low noise; the system has high braking force density, small braking impact and high reliability; the system is easy to modularize. The system is particularly suitable for being used on mobile platforms such as ships, vehicles and the like.
Drawings
Fig. 1 is a schematic primary structural diagram of a linear electromagnetic ejection system of a prior art unmanned aerial vehicle;
fig. 2 is a schematic view of a secondary structure of the linear induction ejection motor of fig. 1;
fig. 3 is a schematic cross-sectional view of the linear induction ejection motor of fig. 1;
FIG. 4 is a schematic structural diagram of an electromagnetic ejection system of another permanent magnet linear motor type unmanned aerial vehicle in the prior art
Fig. 5 is a schematic structural diagram of a first high-speed linear electromagnetic propulsion and braking system according to a first embodiment of the present invention, in which a represents an electromagnetic braking section, b represents an electromagnetic accelerating section, and c represents a secondary stage;
FIG. 6 is a schematic diagram of the secondary structure of FIG. 5;
FIG. 7 is a detail view of the permanent magnet structure of FIG. 5;
FIG. 8 is a structural detail view of the upper, middle and lower sub-levels of FIG. 5;
fig. 9 is a schematic structural diagram of a second high-speed linear electromagnetic propulsion and braking system according to a second embodiment of the present invention, in which a represents an electromagnetic braking section, b represents an electromagnetic accelerating section, and c represents a secondary stage;
FIG. 10 is a schematic diagram of the secondary structure of FIG. 9;
FIG. 11 is a detail view of the permanent magnet structure of FIG. 9;
FIG. 12 is a structural detail view of the upper, middle and lower sub-levels of FIG. 9;
FIG. 13 is a schematic structural diagram of a third high-speed linear electromagnetic propulsion and braking system according to a third embodiment of the present invention, in which a represents an electromagnetic braking section, b represents an electromagnetic accelerating section, and c represents a secondary section;
FIG. 14 is a schematic diagram of the secondary structure of FIG. 13;
FIG. 15 is a detail view of the permanent magnet structure of FIG. 13;
fig. 16 is a detail view of the left, middle and right secondary structures of fig. 13.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The first embodiment is as follows: the present embodiment is described below with reference to fig. 5 to 8, and the present embodiment describes a high-speed linear electromagnetic propulsion and electromagnetic braking system, which includes a primary stage and a secondary stage, wherein the primary stage includes an electromagnetic accelerating section and an electromagnetic braking section; the electromagnetic accelerating section and the electromagnetic braking section share a secondary, and the secondary is a rotor;
the electromagnetic acceleration section is formed by driving an armature of the coreless linear permanent magnet synchronous motor; the electromagnetic braking section consists of an eddy current braking conductor plate and a braking coreless linear permanent magnet synchronous motor armature;
the electromagnetic acceleration section is divided into n along the motion direction1Segment, n1Not less than 1; each section of the electromagnetic acceleration section comprises 2i units for driving an armature of the coreless linear permanent magnet synchronous motor, wherein i is more than or equal to 1;
the electromagnetic braking section is divided into n along the motion direction2Segment, n2Not less than 1; each section of the electromagnetic braking section comprises 2j units of eddy current braking conductor plates1，j1Not less than 0, each section of the electromagnetic braking section contains 2j units of braking coreless linear permanent magnet synchronous motor armature2，j2≥0，i≥j1+j2；
The secondary comprises 1 upper secondary, i-1 middle secondary, 1 lower secondary and i middle supporting plates;
the upper permanent magnet is fixed on the lower side of the upper secondary yoke plate;
the middle secondary comprises a middle secondary substrate and a middle permanent magnet, and the middle permanent magnet is fixed on the upper side and the lower side of the middle secondary substrate;
the lower secondary comprises a lower secondary yoke plate and a lower permanent magnet, and the lower permanent magnet is fixed on the upper side of the lower secondary yoke plate;
the upper permanent magnet, the middle permanent magnet and the lower permanent magnet respectively comprise two arrays of permanent magnets which are arranged in a bilateral symmetry mode, and the permanent magnets of each array are sequentially and alternately arranged in N, S mode along the moving direction;
the upper secondary, the middle secondary and the lower secondary are sequentially arranged in parallel and connected through a middle supporting plate which is vertically arranged; the middle support plate is positioned between the left array and the right array of the upper permanent magnet, the middle permanent magnet and the lower permanent magnet;
the magnetizing directions of the permanent magnets at the corresponding positions of the upper secondary, the middle secondary and the lower secondary are the same, so that a series magnetic circuit is formed;
the 2i units for driving the coreless linear permanent magnet synchronous motor armature are divided into a left group and a right group which are symmetrically arranged, windings at corresponding positions of the left group and the right group of units are connected in series, when the secondary is coupled with the electromagnetic acceleration section, the units for driving the coreless linear permanent magnet synchronous motor armature are respectively positioned among 1 upper secondary, i-1 middle secondary and 1 lower secondary, air gaps are formed among the units for driving the coreless linear permanent magnet synchronous motor armature, the upper secondary, the middle secondary and the lower secondary, and the plane where the air gaps are positioned is parallel to the motion direction;
2j1unit of eddy current brake conductor plate and 2j2The units of the armature of the braking coreless linear permanent magnet synchronous motor are divided into a left group and a right group which are symmetrically arranged, when the secondary is coupled with the electromagnetic braking section, the units of each eddy current braking conductor plate and the units of the armature of the braking coreless linear permanent magnet synchronous motor are respectively positioned among 1 upper secondary, i-1 middle secondary and 1 lower secondary, air gaps are formed among the units of each eddy current braking conductor plate and the units of the armature of the braking coreless linear permanent magnet synchronous motor, the upper secondary, the middle secondary and the lower secondary, and the plane where each air gap is positioned is parallel to the movement direction.
Further, 2i units for driving the armature of the coreless linear permanent magnet synchronous motor, 2j1Unit of eddy current brake conductor plate and 2j2The units of the armature of the braking coreless linear permanent magnet synchronous motor are all fixed on the base.
Still further, the primary windings of the driving coreless linear permanent magnet synchronous motor and the braking coreless linear permanent magnet synchronous motor adopt fractional slot concentrated windings or integer slot windings; single or double layer windings may also be used.
Still further, the number of phases of primary windings of the driving coreless linear permanent magnet synchronous motor and the braking coreless linear permanent magnet synchronous motor is more than or equal to 3.
Still further, the secondary adopts a surface-mounted permanent magnet structure, an embedded permanent magnet structure or a Halbach permanent magnet array structure.
And further, after the braking of the secondary stage is static, the braking coreless linear permanent magnet synchronous motor drives the secondary stage to return to the electromagnetic acceleration section.
In this embodiment, the upper secondary yoke plate, the intermediate secondary base plate, the lower secondary yoke plate, and the intermediate support plate may be an integrated structure.
The second embodiment is as follows: the present embodiment is described below with reference to fig. 9 to 12, and the present embodiment describes a high-speed linear electromagnetic propulsion and electromagnetic braking system, which includes two primary stages and a secondary stage, where the primary stage includes an electromagnetic accelerating section and an electromagnetic braking section; the electromagnetic accelerating section and the electromagnetic braking section share a secondary, and the secondary is a rotor;
the electromagnetic acceleration section is formed by driving an armature of the coreless linear permanent magnet synchronous motor; the electromagnetic braking section consists of an eddy current braking conductor plate and a braking coreless linear permanent magnet synchronous motor armature;
the electromagnetic acceleration section is divided into n along the motion direction1Segment, n1Not less than 1; each section of the electromagnetic acceleration section comprises 2i units for driving an armature of the coreless linear permanent magnet synchronous motor, wherein i is more than or equal to 1;
the electromagnetic braking section is divided into n along the motion direction2Segment, n2Not less than 1; each section of the electromagnetic braking section comprises 2j units of eddy current braking conductor plates1，j1Not less than 0, each section of the electromagnetic braking section contains 2j units of braking coreless linear permanent magnet synchronous motor armature2，j2≥0，i≥j1+j2；
The secondary comprises an upper secondary, i-1 middle secondary, a lower secondary, i left middle support plates and i right middle support plates;
the last stage comprises a symmetrically arranged upper left secondary and upper right secondary,
the upper left secondary comprises an upper left yoke plate and an upper left permanent magnet, the upper left permanent magnet is arranged on the lower side of the upper left yoke plate,
the upper right secondary comprises an upper right yoke plate and an upper right permanent magnet, the upper right permanent magnet is arranged on the lower side of the upper right yoke plate,
the middle secondary is divided into a left middle secondary and a right middle secondary which are symmetrically arranged and have the same structure, and comprises a middle secondary substrate and a middle permanent magnet, the middle permanent magnet is arranged on the upper side and the lower side of the middle secondary substrate,
the lower secondary comprises a lower left secondary and a lower right secondary which are symmetrically arranged,
the lower left secondary comprises a lower left yoke plate and a lower left permanent magnet, the lower left permanent magnet is arranged on the upper side of the lower left yoke plate,
the lower right secondary comprises a lower right yoke plate and a lower right permanent magnet, the lower right permanent magnet is arranged on the upper side of the lower right yoke plate,
the upper left permanent magnet, the upper right permanent magnet, the middle permanent magnet, the lower left permanent magnet and the lower right permanent magnet are sequentially and alternately arranged at N, S along the motion direction;
the upper secondary, the middle secondary and the lower secondary are arranged in parallel, the left sides of the upper left secondary, the left middle secondary and the lower left secondary are connected through a vertically arranged left middle support plate, the right sides of the upper right secondary, the right middle secondary and the lower right secondary are connected through a vertically arranged right middle support plate, an upper left yoke plate and an upper right yoke plate are connected, a gap is formed between the left middle secondary and the right middle secondary, and a gap is formed between the lower left secondary and the lower right secondary;
the magnetizing directions of the permanent magnets at the corresponding positions of the upper secondary, the middle secondary and the lower secondary are the same, so that a series magnetic circuit is formed;
the two primary stages are arranged between the upper secondary stage and the lower secondary stage, an upper air gap is formed between one primary stage and the upper secondary stage, a lower air gap is formed between the other primary stage and the lower secondary stage, and the planes of the upper air gap and the lower air gap are parallel to the motion direction;
the 2i units for driving the armature of the coreless linear permanent magnet synchronous motor are divided into a left group and a right group which are coplanar and symmetrically arranged, the units of the armature of the coreless linear permanent magnet synchronous motor at the corresponding positions of the left group and the right group of units are connected, windings at the corresponding positions of the left group and the right group of units are connected in series, when the secondary is coupled with the electromagnetic acceleration section, the units for driving the armature of the coreless linear permanent magnet synchronous motor are respectively positioned among the upper secondary, the i-1 middle secondary and the lower secondary, air gaps are formed among the units for driving the armature of the coreless linear permanent magnet synchronous motor, the upper secondary, the middle secondary and the lower secondary, and the plane where the air gaps are positioned is parallel to;
2j1unit of eddy current brake conductor plate and 2j2The units of the armature of the braking coreless linear permanent magnet synchronous motor are divided into a left group and a right group which are symmetrically arranged, the units of the eddy current braking conductor plates at the corresponding positions of the left group and the right group of units are connected, the units of the armature of the braking coreless linear permanent magnet synchronous motor at the corresponding positions of the left group and the right group of units are connected, when the secondary is coupled with the electromagnetic braking section, the units of each eddy current braking conductor plate and the units of the armature of the braking coreless linear permanent magnet synchronous motor are respectively positioned among the upper secondary, the i-1 middle secondary and the lower secondary, air gaps are formed among the units of each eddy current braking conductor plate and the units of the armature of the braking coreless linear permanent magnet synchronous motor, the upper secondary, the middle secondary and the lower secondary, and the plane where.
Further, 2i units for driving the armature of the coreless linear permanent magnet synchronous motor, 2j1Unit of eddy current brake conductor plate and 2j2The units of the armature of the braking coreless linear permanent magnet synchronous motor are fixed on the base through the connecting plates; the connecting plate is located in the gap between the left middle secondary and the right middle secondary and the gap between the lower left secondary and the lower right secondary.
Still further, the primary windings of the driving coreless linear permanent magnet synchronous motor and the braking coreless linear permanent magnet synchronous motor adopt fractional slot concentrated windings or integer slot windings; single or double layer windings may also be used.
Still further, the number of phases of primary windings of the driving coreless linear permanent magnet synchronous motor and the braking coreless linear permanent magnet synchronous motor is more than or equal to 3.
Still further, the secondary adopts a surface-mounted permanent magnet structure, an embedded permanent magnet structure or a Halbach permanent magnet array structure.
And further, after the braking of the secondary stage is static, the braking coreless linear permanent magnet synchronous motor drives the secondary stage to return to the electromagnetic acceleration section.
In this embodiment, the units of the eddy current braking conductor plates at the left and right corresponding positions may be of an integrated structure.
In this embodiment, the upper left yoke plate, the upper right yoke plate, the intermediate secondary substrate, the lower left yoke plate, the lower right yoke plate, and the intermediate support plate may be an integrated structure.
The third concrete implementation mode: the present embodiment is described below with reference to fig. 13 to 16, and the present embodiment describes a high-speed linear electromagnetic propulsion and electromagnetic braking system, which includes a primary stage and a secondary stage, wherein the primary stage includes an electromagnetic acceleration section and an electromagnetic braking section; the electromagnetic accelerating section and the electromagnetic braking section share a secondary, and the secondary is a rotor;
the electromagnetic acceleration section is formed by driving an armature of the coreless linear permanent magnet synchronous motor; the electromagnetic braking section consists of an eddy current braking conductor plate and a braking coreless linear permanent magnet synchronous motor armature;
the electromagnetic acceleration section is divided into n along the motion direction1Segment, n1Not less than 1; each section of the electromagnetic acceleration section comprises i units for driving an armature of the coreless linear permanent magnet synchronous motor, wherein i is more than or equal to 1;
the electromagnetic braking section is divided into n along the motion direction2Segment, n2Not less than 1; each segment of the electromagnetic braking section comprises a number j of units of eddy current braking conductor plates1，j1Not less than 0, the number of units of each section of the electromagnetic braking section containing the armature of the braking coreless linear permanent magnet synchronous motor is j2，j2≥0，i≥j1+j2；
The secondary comprises 1 left secondary, i-1 middle secondary, 1 right secondary and i middle supporting plates;
the left secondary comprises a left secondary yoke plate and a left permanent magnet, and the left permanent magnet is fixed on the right side of the left secondary yoke plate;
the middle secondary comprises a middle secondary substrate and a middle permanent magnet, and the middle permanent magnet is fixed on the left side and the right side of the middle secondary substrate;
the right secondary comprises a right secondary yoke plate and a right permanent magnet, and the right permanent magnet is fixed on the left side of the right secondary yoke plate;
the left permanent magnet, the middle permanent magnet and the right permanent magnet are sequentially and alternately arranged at N, S along the motion direction;
the left secondary, the middle secondary and the right secondary are sequentially arranged in parallel, and the upper sides of the left secondary, the middle secondary and the right secondary are connected through a middle supporting plate; the middle support plate is positioned among the left permanent magnet, the middle permanent magnet and the right permanent magnet;
the magnetizing directions of the permanent magnets at the corresponding positions of the left secondary, the middle secondary and the right secondary are the same, so that a series magnetic circuit is formed;
when the secondary is coupled with the electromagnetic acceleration section, the i units for driving the armature of the coreless linear permanent magnet synchronous motor are respectively positioned among the left secondary, the i-1 middle secondary and the right secondary, air gaps are formed among the units for driving the armature of the coreless linear permanent magnet synchronous motor, the left secondary, the middle secondary and the right secondary, and the plane where the air gaps are positioned is parallel to the motion direction and is vertical to the horizontal plane;
when the secondary is coupled to the electromagnetic braking section, j1Unit of eddy current brake conductor plate and j2The units for braking the armature of the coreless linear permanent magnet synchronous motor are respectively positioned among the left secondary, the i-1 middle secondary and the right secondary, air gaps are formed among the units for braking the conductor plate by eddy current and the units for braking the armature of the coreless linear permanent magnet synchronous motor, the left secondary, the middle secondary and the right secondary, and the plane where each air gap is positioned is parallel to the motion direction and is vertical to the horizontal plane.
Further, i units for driving an armature of the coreless linear permanent magnet synchronous motor, j1Unit of eddy current brake conductor plate and j2The units of the armature of the braking coreless linear permanent magnet synchronous motor are all fixed on the base.
Still further, the primary windings of the driving coreless linear permanent magnet synchronous motor and the braking coreless linear permanent magnet synchronous motor adopt fractional slot concentrated windings or integer slot windings; single or double layer windings may also be used.
Still further, the number of phases of primary windings of the driving coreless linear permanent magnet synchronous motor and the braking coreless linear permanent magnet synchronous motor is more than or equal to 3.
Still further, the secondary adopts a surface-mounted permanent magnet structure, an embedded permanent magnet structure or a Halbach permanent magnet array structure.
And further, after the braking of the secondary stage is static, the braking coreless linear permanent magnet synchronous motor drives the secondary stage to return to the electromagnetic acceleration section.
In this embodiment, the left secondary yoke plate, the middle secondary base plate, the right secondary yoke plate, and the middle support plate may be an integrated structure.
In the invention, a primary substrate for driving the coreless linear permanent magnet synchronous motor is made of a non-magnetic high-strength material, and the primary substrate is encapsulated by epoxy resin; the primary substrate of the braking coreless linear permanent magnet synchronous motor is made of high-strength non-metal materials or metal materials, and the primary substrate is encapsulated by epoxy resin.
In the invention, the primary is a liquid cooling structure, and a cooling liquid flow channel is arranged on the primary substrate.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (10)
1. The high-speed linear electromagnetic propulsion and electromagnetic braking system is characterized by comprising a primary stage and a secondary stage, wherein the primary stage comprises an electromagnetic acceleration section and an electromagnetic braking section; the electromagnetic accelerating section and the electromagnetic braking section share a secondary, and the secondary is a rotor;
the electromagnetic acceleration section is formed by driving an armature of the coreless linear permanent magnet synchronous motor; the electromagnetic braking section consists of an eddy current braking conductor plate and a braking coreless linear permanent magnet synchronous motor armature;
the electromagnetic acceleration section is divided into n along the motion direction1Segment, n1Not less than 1; each section of the electromagnetic acceleration section comprises 2i units for driving an armature of the coreless linear permanent magnet synchronous motor, wherein i is more than or equal to 1;
the electromagnetic braking section is divided into n along the motion direction2Segment, n2Not less than 1; each section of the electromagnetic braking section comprises 2j units of eddy current braking conductor plates1，j1Not less than 0, each section of the electromagnetic braking section contains 2j units of braking coreless linear permanent magnet synchronous motor armature2，j2≥0，i≥j1+j2；
The secondary comprises 1 upper secondary, i-1 middle secondary, 1 lower secondary and i middle supporting plates;
the upper permanent magnet is fixed on the lower side of the upper secondary yoke plate;
the middle secondary comprises a middle secondary substrate and a middle permanent magnet, and the middle permanent magnet is fixed on the upper side and the lower side of the middle secondary substrate;
the lower secondary comprises a lower secondary yoke plate and a lower permanent magnet, and the lower permanent magnet is fixed on the upper side of the lower secondary yoke plate;
the upper permanent magnet, the middle permanent magnet and the lower permanent magnet respectively comprise two arrays of permanent magnets which are arranged in a bilateral symmetry mode, and the permanent magnets of each array are sequentially and alternately arranged in N, S mode along the moving direction;
the upper secondary, the middle secondary and the lower secondary are sequentially arranged in parallel and connected through a middle supporting plate which is vertically arranged; the middle support plate is positioned between the left array and the right array of the upper permanent magnet, the middle permanent magnet and the lower permanent magnet;
the magnetizing directions of the permanent magnets at the corresponding positions of the upper secondary, the middle secondary and the lower secondary are the same, so that a series magnetic circuit is formed;
the 2i units for driving the coreless linear permanent magnet synchronous motor armature are divided into a left group and a right group which are symmetrically arranged, windings at corresponding positions of the left group and the right group of units are connected in series, when the secondary is coupled with the electromagnetic acceleration section, the units for driving the coreless linear permanent magnet synchronous motor armature are respectively positioned among 1 upper secondary, i-1 middle secondary and 1 lower secondary, air gaps are formed among the units for driving the coreless linear permanent magnet synchronous motor armature, the upper secondary, the middle secondary and the lower secondary, and the plane where the air gaps are positioned is parallel to the motion direction;
2j1unit of eddy current brake conductor plate and 2j2The units of the armature of the braking coreless linear permanent magnet synchronous motor are divided into a left group and a right group which are symmetrically arranged, when the secondary is coupled with the electromagnetic braking section, the units of each eddy current braking conductor plate and the units of the armature of the braking coreless linear permanent magnet synchronous motor are respectively positioned among 1 upper secondary, i-1 middle secondary and 1 lower secondary, air gaps are formed among the units of each eddy current braking conductor plate and the units of the armature of the braking coreless linear permanent magnet synchronous motor, the upper secondary, the middle secondary and the lower secondary, and the plane where each air gap is positioned is parallel to the movement direction.
2. The high-speed linear electromagnetic propulsion and electromagnetic braking system is characterized by comprising two primary stages and a secondary stage, wherein the primary stage comprises an electromagnetic accelerating section and an electromagnetic braking section; the electromagnetic accelerating section and the electromagnetic braking section share a secondary, and the secondary is a rotor;
the electromagnetic acceleration section is formed by driving an armature of the coreless linear permanent magnet synchronous motor; the electromagnetic braking section consists of an eddy current braking conductor plate and a braking coreless linear permanent magnet synchronous motor armature;
the electromagnetic acceleration section is divided into n along the motion direction1Segment, n1Not less than 1; each section of the electromagnetic acceleration section comprises 2i units for driving an armature of the coreless linear permanent magnet synchronous motor, wherein i is more than or equal to 1;
the electromagnetic braking section is divided into n along the motion direction2Segment, n2Not less than 1; each section of the electromagnetic braking section comprises 2j units of eddy current braking conductor plates1，j1Not less than 0, each section of the electromagnetic braking section contains 2j units of braking coreless linear permanent magnet synchronous motor armature2，j2≥0，i≥j1+j2；
The secondary comprises an upper secondary, i-1 middle secondary, a lower secondary, i left middle support plates and i right middle support plates;
the last stage comprises a symmetrically arranged upper left secondary and upper right secondary,
the upper left secondary comprises an upper left yoke plate and an upper left permanent magnet, the upper left permanent magnet is arranged on the lower side of the upper left yoke plate,
the upper right secondary comprises an upper right yoke plate and an upper right permanent magnet, the upper right permanent magnet is arranged on the lower side of the upper right yoke plate,
the middle secondary is divided into a left middle secondary and a right middle secondary which are symmetrically arranged and have the same structure, and comprises a middle secondary substrate and a middle permanent magnet, the middle permanent magnet is arranged on the upper side and the lower side of the middle secondary substrate,
the lower secondary comprises a lower left secondary and a lower right secondary which are symmetrically arranged,
the lower left secondary comprises a lower left yoke plate and a lower left permanent magnet, the lower left permanent magnet is arranged on the upper side of the lower left yoke plate,
the lower right secondary comprises a lower right yoke plate and a lower right permanent magnet, the lower right permanent magnet is arranged on the upper side of the lower right yoke plate,
the upper left permanent magnet, the upper right permanent magnet, the middle permanent magnet, the lower left permanent magnet and the lower right permanent magnet are sequentially and alternately arranged at N, S along the motion direction;
the upper secondary, the middle secondary and the lower secondary are arranged in parallel, the left sides of the upper left secondary, the left middle secondary and the lower left secondary are connected through a vertically arranged left middle support plate, the right sides of the upper right secondary, the right middle secondary and the lower right secondary are connected through a vertically arranged right middle support plate, an upper left yoke plate and an upper right yoke plate are connected, a gap is formed between the left middle secondary and the right middle secondary, and a gap is formed between the lower left secondary and the lower right secondary;
the magnetizing directions of the permanent magnets at the corresponding positions of the upper secondary, the middle secondary and the lower secondary are the same, so that a series magnetic circuit is formed;
the two primary stages are arranged between the upper secondary stage and the lower secondary stage, an upper air gap is formed between one primary stage and the upper secondary stage, a lower air gap is formed between the other primary stage and the lower secondary stage, and the planes of the upper air gap and the lower air gap are parallel to the motion direction;
the 2i units for driving the armature of the coreless linear permanent magnet synchronous motor are divided into a left group and a right group which are coplanar and symmetrically arranged, the units of the armature of the coreless linear permanent magnet synchronous motor at the corresponding positions of the left group and the right group of units are connected, windings at the corresponding positions of the left group and the right group of units are connected in series, when the secondary is coupled with the electromagnetic acceleration section, the units for driving the armature of the coreless linear permanent magnet synchronous motor are respectively positioned among the upper secondary, the i-1 middle secondary and the lower secondary, air gaps are formed among the units for driving the armature of the coreless linear permanent magnet synchronous motor, the upper secondary, the middle secondary and the lower secondary, and the plane where the air gaps are positioned is parallel to;
2j1unit of eddy current brake conductor plate and 2j2The units of the armature of the braking coreless linear permanent magnet synchronous motor are divided into a left group and a right group which are symmetrically arranged, the units of the eddy current braking conductor plates at the corresponding positions of the left group and the right group of units are connected, the units of the armature of the braking coreless linear permanent magnet synchronous motor at the corresponding positions of the left group and the right group of units are connected, when the secondary is coupled with the electromagnetic braking section, the units of each eddy current braking conductor plate and the units of the armature of the braking coreless linear permanent magnet synchronous motor are respectively positioned among the upper secondary, the i-1 middle secondary and the lower secondary, air gaps are formed among the units of each eddy current braking conductor plate and the units of the armature of the braking coreless linear permanent magnet synchronous motor, the upper secondary, the middle secondary and the lower secondary, and the plane where.
3. The high-speed linear electromagnetic propulsion and electromagnetic braking system is characterized by comprising a primary stage and a secondary stage, wherein the primary stage comprises an electromagnetic acceleration section and an electromagnetic braking section; the electromagnetic accelerating section and the electromagnetic braking section share a secondary, and the secondary is a rotor;
the electromagnetic acceleration section is formed by driving an armature of the coreless linear permanent magnet synchronous motor; the electromagnetic braking section consists of an eddy current braking conductor plate and a braking coreless linear permanent magnet synchronous motor armature;
the electromagnetic acceleration section is divided into n along the motion direction1Segment, n1Not less than 1; each section of the electromagnetic acceleration section comprises i units for driving an armature of the coreless linear permanent magnet synchronous motor, wherein i is more than or equal to 1;
the electromagnetic braking section is divided into n along the motion direction2Segment, n2Not less than 1; each segment of the electromagnetic braking section comprises a number j of units of eddy current braking conductor plates1，j1Not less than 0, the number of units of each section of the electromagnetic braking section containing the armature of the braking coreless linear permanent magnet synchronous motor is j2，j2≥0，i≥j1+j2；
The secondary comprises 1 left secondary, i-1 middle secondary, 1 right secondary and i middle supporting plates;
the left secondary comprises a left secondary yoke plate and a left permanent magnet, and the left permanent magnet is fixed on the right side of the left secondary yoke plate;
the middle secondary comprises a middle secondary substrate and a middle permanent magnet, and the middle permanent magnet is fixed on the left side and the right side of the middle secondary substrate;
the right secondary comprises a right secondary yoke plate and a right permanent magnet, and the right permanent magnet is fixed on the left side of the right secondary yoke plate;
the left permanent magnet, the middle permanent magnet and the right permanent magnet are sequentially and alternately arranged at N, S along the motion direction;
the left secondary, the middle secondary and the right secondary are sequentially arranged in parallel, and the upper sides of the left secondary, the middle secondary and the right secondary are connected through a middle supporting plate; the middle support plate is positioned among the left permanent magnet, the middle permanent magnet and the right permanent magnet;
the magnetizing directions of the permanent magnets at the corresponding positions of the left secondary, the middle secondary and the right secondary are the same, so that a series magnetic circuit is formed;
when the secondary is coupled with the electromagnetic acceleration section, the i units for driving the armature of the coreless linear permanent magnet synchronous motor are respectively positioned among the left secondary, the i-1 middle secondary and the right secondary, air gaps are formed among the units for driving the armature of the coreless linear permanent magnet synchronous motor, the left secondary, the middle secondary and the right secondary, and the plane where the air gaps are positioned is parallel to the motion direction and is vertical to the horizontal plane;
when the secondary is coupled to the electromagnetic braking section, j1Unit of eddy current brake conductor plate and j2The units for braking the armature of the coreless linear permanent magnet synchronous motor are respectively positioned among the left secondary, the i-1 middle secondary and the right secondary, air gaps are formed among the units for braking the conductor plate by eddy current and the units for braking the armature of the coreless linear permanent magnet synchronous motor, the left secondary, the middle secondary and the right secondary, and the plane where each air gap is positioned is parallel to the motion direction and is vertical to the horizontal plane.
4. A high-speed linear electromagnetic propulsion and electromagnetic braking system according to claim 1, characterised by 2iUnit for driving armature of coreless linear permanent magnet synchronous motor, 2j1Unit of eddy current brake conductor plate and 2j2The units of the armature of the braking coreless linear permanent magnet synchronous motor are all fixed on the base.
5. A high speed linear electromagnetic propulsion and electromagnetic braking system as claimed in claim 2 wherein 2i units driving the armature of the coreless linear permanent magnet synchronous motor, 2j1Unit of eddy current brake conductor plate and 2j2The units of the armature of the braking coreless linear permanent magnet synchronous motor are fixed on the base through the connecting plates; the connecting plate is located in the gap between the left middle secondary and the right middle secondary and the gap between the lower left secondary and the lower right secondary.
6. A high speed linear electromagnetic propulsion and electromagnetic braking system as claimed in claim 3 wherein i units driving the armature of the coreless linear permanent magnet synchronous motor j1Unit of eddy current brake conductor plate and j2The units of the armature of the braking coreless linear permanent magnet synchronous motor are all fixed on the base.
7. The high-speed linear electromagnetic propulsion and electromagnetic braking system of any one of claims 1 to 6, wherein the primary windings of the driving coreless linear permanent magnet synchronous motor and the braking coreless linear permanent magnet synchronous motor are fractional slot concentrated windings or integer slot windings; single or double layer windings may also be used.
8. The high-speed linear electromagnetic propulsion and electromagnetic braking system of any one of claims 1 to 6 wherein the number of phases of the primary windings of the driving coreless linear permanent magnet synchronous motor and the braking coreless linear permanent magnet synchronous motor is 3 or more.
9. The high-speed linear electromagnetic propulsion and electromagnetic braking system of any one of claims 1 to 6 wherein the secondary employs a surface-mounted permanent magnet structure, an embedded permanent magnet structure, or a Halbach permanent magnet array structure.
10. A high speed linear electromagnetic propulsion and electromagnetic braking system as claimed in any one of claims 1 to 6 wherein the braking coreless linear permanent magnet synchronous motor drives the secondary back to the electromagnetic acceleration section after the secondary braking is stationary.
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