阅读说明：本技术 用于磁悬浮电磁推进系统的地面线圈、定子及直线电机 (Ground coil, stator and linear motor for magnetic suspension electromagnetic propulsion system ) 是由 张艳清 张志华 杜修方 陈松 王岩 朱然 于 2020-04-07 设计创作，主要内容包括：本发明提供了一种用于磁悬浮电磁推进系统的地面线圈、定子及直线电机,该地面线圈包括依次首尾连接的第一导体边、第二导体边、第三导体边、第四导体边、第五导体边和第六导体边,第一导体边与第二导体边相对于地面线圈的中心线对称设置,第一导体边与第二导体边呈第一夹角设置,第四导体边与第五导体边相对于地面线圈的中心线对称设置,第四导体边与第五导体边呈第二夹角设置,第一夹角与第二夹角相等,第三导体边和第六导体边均为水平直线边。应用本发明的技术方案,以解决现有技术中地面线圈无法在保证反电势谐波含量低的情况下不产生悬浮力以及降低推力波动的技术问题。(The invention provides a ground coil, a stator and a linear motor for a magnetic suspension electromagnetic propulsion system, wherein the ground coil comprises a first conductor side, a second conductor side, a third conductor side, a fourth conductor side, a fifth conductor side and a sixth conductor side which are sequentially connected end to end, the first conductor side and the second conductor side are symmetrically arranged relative to the center line of the ground coil, the first conductor side and the second conductor side are arranged in a first included angle mode, the fourth conductor side and the fifth conductor side are symmetrically arranged relative to the center line of the ground coil, the fourth conductor side and the fifth conductor side are arranged in a second included angle mode, the first included angle is equal to the second included angle, and the third conductor side and the sixth conductor side are horizontal linear sides. By applying the technical scheme of the invention, the technical problems that the ground coil cannot generate suspension force and reduce thrust fluctuation under the condition of ensuring low content of counter potential harmonic in the prior art are solved.)

1. A ground coil for a magnetic levitation electromagnetic propulsion system is characterized in that the ground coil comprises a first conductor edge (10), a second conductor edge (20), a third conductor edge (30), a fourth conductor edge (40), a fifth conductor edge (50) and a sixth conductor edge (60) which are sequentially connected end to end, the first conductor edge (10) and the second conductor edge (20) are arranged symmetrically with respect to the center line of the ground coil, the first conductor edge (10) and the second conductor edge (20) are arranged in a first included angle, the fourth conductor side (40) and the fifth conductor side (50) are arranged symmetrically with respect to the center line of the ground coil, the fourth conductor edge (40) and the fifth conductor edge (50) are arranged at a second included angle, the first included angle is equal to the second included angle, and the third conductor edge (30) and the sixth conductor edge (60) are both horizontal straight line edges.

2. The ground coil for a magnetic levitation electromagnetic propulsion system as recited in claim 1, wherein the first conductor edge (10), the second conductor edge (20), the fourth conductor edge (40) and the fifth conductor edge (50) each comprise a shape of a straight line, an arc or a wave.

3. The ground coil for a magnetic levitation electromagnetic propulsion system as recited in claim 2, wherein a projected distance c in a horizontal direction of any one of the first conductor side (10), the second conductor side (20), the fourth conductor side (40) and the fifth conductor side (50) is dependent onWhere τ is the pole pitch and v is the order of the harmonic.

4. A motor stator for a magnetic levitation electromagnetic propulsion system is characterized in that the motor stator comprises a plurality of motor stator sections arranged along the movement direction of a vehicle body, each motor stator section comprises a plurality of first stator coil sections (101) which are sequentially connected in series and are fixed on the ground and positioned at one side of the vehicle body, and a plurality of second stator coil sections (102) which are sequentially connected in series and are fixed on the ground and positioned at the other side of the vehicle body, the motor stator is an n-phase concentrated winding, the first stator coil section (101) comprises n first stator coils, the second stator coil segment (102) comprises n second stator coils, both of which are ground coils according to any one of claims 1 to 3, the n first stator coils being connected in series with the n second stator coils.

5. A linear motor for a magnetically levitated electromagnetic propulsion system, characterized in that it comprises a motor stator for a magnetically levitated electromagnetic propulsion system as claimed in claim 4.

6. A linear motor according to claim 5, characterized in that the linear motor comprises a first mover coil set (201) and a second mover coil set (202), the first mover coil set (201) being fixedly arranged at one side of the vehicle body and being arranged opposite to the plurality of first stator coil segments (101), the second mover coil set (202) being fixedly arranged at the other side of the vehicle body and being arranged opposite to the plurality of second stator coil segments (102).

7. A linear motor according to claim 6, characterized in that the first and second mover coil sets (201, 202) each comprise superconducting coils or halbach permanent magnet arrays.

Technical Field

The invention relates to the technical field of magnetic suspension electromagnetic propulsion linear motors, in particular to a ground coil, a stator and a linear motor for a magnetic suspension electromagnetic propulsion system.

Background

Currently, in a magnetic levitation electromagnetic propulsion system, a linear motor rotor is mounted on a vehicle body, and a stator coil is mounted on the ground and located on one side of a superconducting coil. The common ground coil of the linear motor is in the shape of a rectangular ground coil and a skewed ground coil. However, the existing rectangular ground coil has the defects of high back electromotive force harmonic content and large motor thrust fluctuation. For the existing chute ground coil, as shown in fig. 6, the counter potential harmonic content is relatively low, but the effective edge of the chute coil is pushed to incline, so that the motor generates a thrust force F_xWhile generating a certain suspension force F_y。

Disclosure of Invention

The invention provides a ground coil, a stator and a linear motor for a magnetic suspension electromagnetic propulsion system, which can solve the technical problems that the ground coil cannot generate suspension force and reduce thrust fluctuation under the condition of ensuring low content of counter potential harmonic in the prior art.

According to one aspect of the invention, a ground coil for a magnetic suspension electromagnetic propulsion system is provided, the ground coil comprises a first conductor side, a second conductor side, a third conductor side, a fourth conductor side, a fifth conductor side and a sixth conductor side which are sequentially connected end to end, the first conductor side and the second conductor side are symmetrically arranged relative to a center line of the ground coil, the first conductor side and the second conductor side are arranged at a first included angle, the fourth conductor side and the fifth conductor side are symmetrically arranged relative to the center line of the ground coil, the fourth conductor side and the fifth conductor side are arranged at a second included angle, the first included angle is equal to the second included angle, and the third conductor side and the sixth conductor side are horizontal straight line sides.

Further, the shapes of the first conductor side, the second conductor side, the fourth conductor side and the fifth conductor side all comprise a straight line shape, an arc shape or a wave shape.

Further, the first conductor side and the second conductor sideThe projection distance c of any one of the fourth conductor side and the fifth conductor side in the horizontal direction can be determined according toWhere τ is the pole pitch and v is the order of the harmonic.

According to another aspect of the invention, there is provided a motor stator for a magnetically levitated electromagnetic propulsion system, the motor stator comprising a plurality of motor stator segments arranged in a direction of motion of a vehicle body, each motor stator segment comprising a plurality of first stator coil segments fixed on the ground and located on one side of the vehicle body, and a plurality of second stator coil segments fixed on the ground and located on the other side of the vehicle body, the motor stator being an n-phase concentrated winding, the first stator coil segments comprising n first stator coils, the second stator coil segments comprising n second stator coils, the first and second stator coils each being a ground coil as described above, the n first stator coils being connected in series with the n second stator coils.

According to a further aspect of the present invention there is provided a linear electric motor for a magnetically levitated electromagnetic propulsion system, the linear electric motor comprising a motor stator for a magnetically levitated electromagnetic propulsion system as described above.

Further, the linear motor comprises a first rotor coil group and a second rotor coil group, the first rotor coil group is fixedly arranged on one side of the vehicle body and is arranged opposite to the plurality of first stator coil sections, and the second rotor coil group is fixedly arranged on the other side of the vehicle body and is arranged opposite to the plurality of second stator coil sections.

Further, the first rotor coil group and the second rotor coil group both comprise superconducting coils or halbach permanent magnet arrays.

The technical scheme of the invention provides a ground coil for a magnetic suspension electromagnetic propulsion system, wherein the ground coil is provided with a first conductor side, a second conductor side, a fourth conductor side and a fifth conductor side which are in mirror symmetry up and down, and the first conductor side generates a force F in the suspension direction_y1A force F in a floating direction generated by the second conductor edge_y3Can cancel each other out, the force F in the floating direction generated by the fourth conductor edge_y4A force F in a floating direction generated by the second conductor edge_y2Can counteract each other, thus generating propelling force and generating no suspension force at the same time. In addition, the positions of the first conductor side, the second conductor side, the fourth conductor side and the fifth conductor side of the ground coil in the magnetic field are different from each other, so that the phases of the same harmonic wave are not the same any more, the harmonic wave can be eliminated when the harmonic wave is superposed, and the counter electromotive force harmonic wave content of the motor is further reduced; the counter electromotive force harmonic content of the motor is reduced, so that the thrust fluctuation of the motor is reduced, and the running stability of the train is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 illustrates a force diagram of a ground coil for a magnetically levitated electromagnetic propulsion system provided in accordance with a specific embodiment of the present invention;

FIG. 2 illustrates a schematic structural diagram of a ground coil for a magnetically levitated electromagnetic propulsion system provided in accordance with a specific embodiment of the present invention;

fig. 3 is a schematic structural view illustrating a superconducting linear motor according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram illustrating a permanent magnet linear motor according to an embodiment of the present invention;

FIG. 5 illustrates a mechanical schematic diagram of a partially linear motor segment provided in accordance with a specific embodiment of the present invention;

figure 6 shows a force diagram of a chute ground coil as provided in the prior art.

Wherein the figures include the following reference numerals:

10. a first conductor edge; 20. a second conductor edge; 30. a third conductor side; 40. a fourth conductor side; 50. a fifth conductor side; 60. a sixth conductor side; 101. a first stator coil section; 102. a second stator coil section; 201. a first mover coil set; 202. and the second rotor coil group.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. 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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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 is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in fig. 1 and 2, according to an embodiment of the present invention, there is provided a ground coil for a magnetic levitation electromagnetic propulsion system, the ground coil includes a first conductor edge 10, a second conductor edge 20, a third conductor edge 30, a fourth conductor edge 40, a fifth conductor edge 50, and a sixth conductor edge 60 connected end to end in sequence, the first conductor edge 10 and the second conductor edge 20 are symmetrically disposed with respect to a center line of the ground coil, the first conductor edge 10 and the second conductor edge 20 are disposed at a first included angle, the fourth conductor edge 40 and the fifth conductor edge 50 are symmetrically disposed with respect to the center line of the ground coil, the fourth conductor edge 40 and the fifth conductor edge 50 are disposed at a second included angle, the first included angle is equal to the second included angle, and the third conductor edge 30 and the sixth conductor edge 60 are both horizontal straight edges.

By applying the configuration mode, the ground coil for the magnetic suspension electromagnetic propulsion system is provided, and the ground coil generates a force F in the suspension direction by configuring a first conductor side and a second conductor side which are in mirror symmetry up and down and a fourth conductor side and a fifth conductor side_y1A force F in a floating direction generated by the second conductor edge_y3Can cancel each other out, the force F in the floating direction generated by the fourth conductor edge_y4A force F in a floating direction generated by the second conductor edge_y2Can counteract each other, thus generating propelling force and generating no suspension force at the same time. In addition, the positions of the first conductor side, the second conductor side, the fourth conductor side and the fifth conductor side of the ground coil in the magnetic field are different from each other, so that the phases of the same harmonic wave are not the same any more, the harmonic wave can be eliminated when the harmonic wave is superposed, and the counter electromotive force harmonic wave content of the motor is further reduced; the counter electromotive force harmonic content of the motor is reduced, so that the thrust fluctuation of the motor is reduced, and the running stability of the train is improved.

Further, in the present invention, in order to reduce the back electromotive force harmonic content of the motor, it is necessary to make the oblique sides of the ground coils mirror-symmetrical up and down. In the present invention, the shapes of the first conductor side 10, the second conductor side 20, the fourth conductor side 40 and the fifth conductor side 50 may be configured to include a straight line shape, an arc shape or a wave shape according to specific needs. The shapes of the first conductor edge 10, the second conductor edge 20, the fourth conductor edge 40 and the fifth conductor edge 50 are not limited in the present invention, as long as the first conductor edge 10 and the second conductor edge 20, and the fourth conductor edge 40 and the fifth conductor edge 50 are ensured to be mirror-symmetrical up and down with respect to the center line of the ground coil.

As an embodiment of the present invention, in consideration of convenience of a processing process, as shown in fig. 1 and 2, the first conductor side 10, the second conductor side 20, the fourth conductor side 40, and the fifth conductor side 50 are all linear in shape, the first conductor side 10 and the second conductor side 20 are symmetrically disposed with respect to a center line of the ground coil, the fourth conductor side 40 and the fifth conductor side 50 are symmetrically disposed with respect to a center line of the ground coil, and an outer shape of the ground coil closely resembles an arrow. In the present invention, the direction of the arrow formed by the first conductor side and the second conductor side and the direction of the arrow formed by the fourth conductor side and the fifth conductor side are not limited.

In the invention, in the working process of the magnetic suspension electromagnetic propulsion system, the motor rotor provides a stable excitation magnetic field, when the ground stator coil is introduced with symmetrical m-phase alternating current, a traveling wave magnetic field is generated, and the interaction of the traveling wave magnetic field and the excitation magnetic field generates an electromagnetic driving force to drive a train to do linear motion. The positions of the inclined first conductor edge 10, the second conductor edge 20, the fourth conductor edge 40 and the fifth conductor edge 50 of the ground coil in the magnetic field are different from each other, so that the phases of the same harmonic wave are not the same any more, the harmonic wave can be eliminated when the harmonic wave is superposed, and the counter-potential waveform can be improved.

Specifically, in the present invention, the chute factor k of the v-th harmonic_skvShould be thatWherein c is the first conductor edge 10, the second conductor edge 20, the fourth conductor edgeThe projected distance of either conductor side 40 or fifth conductor side 50 in the horizontal direction (i.e., the skew distance of either conductor side), β is the arc degree of the entire conductor skew, and τ is the pole pitch.

If the v-th harmonic is to be eliminated, the skew slot factor k of the harmonic is set_skvIs equal to 0, thereby obtainingOr

Therefore, if the projected distance c in the horizontal direction of any one of the first conductor side 10, the second conductor side 20, the fourth conductor side 40 and the fifth conductor side 50 is exactly equal to the wavelength of the subharmonic space, the v harmonic electromotive forces in the conductors cancel each other out, and k is then_skv＝0。

As can be seen from the above, in order to reduce harmonics, the projection distance c of any one of the first conductor side 10, the second conductor side 20, the fourth conductor side 40, and the fifth conductor side 50 in the horizontal direction may be determined according to the projection distance c of the conductor sideWhere τ is the pole pitch and v is the order of the harmonic. As can be seen from the formula, the harmonic of 5 th order can be cancelled when the projection distance c of any one of the first conductor side 10, the second conductor side 20, the fourth conductor side 40, and the fifth conductor side 50 in the horizontal direction is 1/5 fundamental wave distance, and the harmonic of 7 th order can be cancelled when the projection distance c of any one of the first conductor side 10, the second conductor side 20, the fourth conductor side 40, and the fifth conductor side 50 in the horizontal direction is 1/7 fundamental wave distance. The advantage that the elimination anti-electronic harmonic brought is that, the holistic thrust fluctuation of motor can reduce, and the train operation is more steady.

According to another aspect of the present invention, there is provided a motor stator for a magnetically levitated electromagnetic propulsion system, the motor stator comprising a plurality of motor stator segments arranged along a direction of motion of a vehicle body, each of the motor stator segments comprising a plurality of first stator coil segments 101 fixed on the ground and located at one side of the vehicle body, and a plurality of second stator coil segments 102 fixed on the ground and located at the other side of the vehicle body, the motor stator being an n-phase concentrated winding, the first stator coil segments 101 comprising n first stator coils, the second stator coil segments 102 comprising n second stator coils, the first stator coils and the second stator coils being ground coils as described above, the n first stator coils being connected in parallel with the n second stator coils.

By applying the configuration mode, the motor stator for the magnetic suspension electromagnetic propulsion system is provided, the motor stator comprises a plurality of motor stator sections, the motor stator adopts a sectional power supply mode, and according to the capacity of the converter, the converter sequentially supplies power to each motor stator section when the train runs; in addition, each motor stator segment is configured to comprise a plurality of first stator coil segments and a plurality of second stator coil segments, the first stator coil segments comprise n first stator coils, the second stator coil segments comprise n second stator coils, and the n first stator coils and the n second stator coils are sequentially connected in parallel. Specifically, when the vehicle body shifts to the left side, the suction force of the left-side single-side motor is small, and the suction force of the right-side single-side motor is large, so that the vehicle body shifts to the right side, and reaches the intermediate position. Furthermore, the ground coil provided by the invention can not generate suspension force and reduce thrust fluctuation under the condition of ensuring low content of counter potential harmonic, so that the ground coil provided by the invention is used in the motor stator, and the working performance of the motor stator can be greatly improved.

According to a further aspect of the present invention, a linear motor for a magnetically levitated electromagnetic propulsion system is provided, the linear motor comprising a motor stator for a magnetically levitated electromagnetic propulsion system as described above, a first mover coil set 201 and a second mover coil set 202, the first mover coil set 201 being fixedly disposed at one side of a vehicle body and being disposed opposite to the plurality of first stator coil segments 101, and the second mover coil set 202 being fixedly disposed at the other side of the vehicle body and being disposed opposite to the plurality of second stator coil segments 102.

Under the configuration mode, a linear motor for a magnetic suspension electromagnetic propulsion system is provided, wherein a first rotor coil group and a second rotor coil group of the linear motor provide stable excitation magnetic fields, when symmetrical m-phase alternating current is introduced into a first stator coil section, a traveling wave magnetic field is generated, and the traveling wave magnetic field and the excitation magnetic field interact to generate electromagnetic driving force to drive a train to do linear motion. Because the first stator coil section that is provided with a plurality of series connection in proper order on one side ground of train, the second stator coil section that is provided with a plurality of series connection in proper order on the opposite side ground of train, first stator coil section includes n first stator coils, second stator coil section includes n second stator coil, n first stator coil and n second stator coil be parallel connection in proper order, under this kind of mode, when the automobile body takes place lateral shifting, the motor has from the restoring force in the direction of leading, the stability of automobile body operation has been improved.

Fig. 5 shows a structural composition of one of the linear motor segments of the linear motor as an embodiment of the present invention. The linear motor segment comprises four first stator coil segments 101 connected in series in sequence and four second stator coil segments 102 connected in series in sequence. The first stator coil section comprises stator coils A1, B1 and C1, the second first stator coil section comprises stator coils A2, B2 and C2, the third first stator coil section comprises stator coils A3, B3 and C3, the fourth first stator coil section comprises stator coils A4, B4 and C4, the stator coils A1, A2, A3 and A4 are sequentially connected in series, the stator coils B1, B2, B3 and B4 are sequentially connected in series, the stator coils C1, C2, C3 and C4 are sequentially connected in series, one ends of the stator coils A1, A2, A3, A4 and the stator coils B1, B2, B3, B4 and the stator coils C1, C2, C3 and C4 are connected with a current transformer, and the other ends of the stator coils are connected in star shape.

The first second stator coil segment comprises stator coils D1 ', E1' and F1 ', the second stator coil segment comprises stator coils D2', E2 'and F2', the third second stator coil segment comprises stator coils D3 ', E3' and F3 ', the fourth second stator coil segment comprises stator coils D4', E4 'and F4', the stator coils D1 ', D2', D3 'and D4' are connected in series in turn, the stator coils E1 ', E2', E3 'and E4' are connected in series in turn, the stator coils F1 ', F2', F3 'and F4' are connected in series in turn, stator coil A1 is connected in parallel with D1 ', stator coil B1 is connected in parallel with E1', C1 is connected in parallel with F1 ', A2 is connected in parallel with D2', B2 is connected in parallel with E2 ', C2 is connected in parallel with F2', A3 is connected in parallel with D3 ', B3 is connected in parallel with E3', C3 is connected in parallel with F3 ', A4 is connected in parallel with D4', B4 is connected in parallel with E4 ', and C4 is connected in parallel with F4'. One end of each of the stator coils D1 ', D2', D3 ', D4' and the stator coils E1 ', E2', E3 ', E4' and the stator coils F1 ', F2', F3 ', F4' is connected to the inverter, and the other end is star-connected, and the star-connected ends of the stator coils D1 ', D2', D3 ', D4', the stator coils E1 ', E2', E3 ', E4' and the stator coils F1 ', F2', F3 ', F4' are connected to the star-connected ends of the stator coils a1, a2, A3, A4, the stator coils B1, B2, B3, B4 and the stator coils C1, C2, C3, C4.

Further, in the present invention, as shown in fig. 3 and 4, the first mover coil set 201 and the second mover coil set 202 each include a superconducting coil or a halbach permanent magnet array. When the first rotor coil group 201 and the second rotor coil group 202 are both superconducting coils, the linear motor is a superconducting linear motor, and when the first rotor coil group 201 and the second rotor coil group 202 are both halbach permanent magnet arrays, the linear motor is a permanent magnet linear motor.

In order to further understand the present invention, a superconducting linear motor provided by the present invention will be described in detail with reference to fig. 1 to 3.

As shown in fig. 1 to 3, according to an embodiment of the present invention, there is provided a superconducting linear motor, which includes a first mover coil group 201, a second mover coil group 202, a plurality of first stator coil segments 101 sequentially connected in series, and a plurality of second stator coil segments 102 sequentially connected in series, the plurality of first stator coil segments 101 sequentially connected in series being fixed on the ground and located at one side of a vehicle body, the plurality of second stator coil segments 102 sequentially connected in series being fixed on the ground and located at the other side of the vehicle body, the first mover coil group 201 being fixedly disposed at one side of the vehicle body, the second mover coil group 202 being fixedly disposed at the other side of the vehicle body, the first mover coil group 201 and the second mover coil group 202 being superconducting coils.

The motor stator is an n-phase concentrated winding, the first stator coil section 101 comprises n first stator coils, the second stator coil section 102 comprises n second stator coils, the first stator coils and the second stator coils are all ground coils, and the n first stator coils and the n second stator coils are sequentially connected in parallel.

The first stator coil and the second stator coil are identical in structure and are both arrow-like structures, any stator coil comprises a first conductor edge 10, a second conductor edge 20, a third conductor edge 30, a fourth conductor edge 40, a fifth conductor edge 50 and a sixth conductor edge 60 which are sequentially connected end to end, the first conductor edge 10 and the second conductor edge 20 are symmetrically arranged relative to the center line of the ground coil, the first conductor edge 10 and the second conductor edge 20 are arranged in a first included angle mode, the fourth conductor edge 40 and the fifth conductor edge 50 are symmetrically arranged relative to the center line of the ground coil, the fourth conductor edge 40 and the fifth conductor edge 50 are arranged in a second included angle mode, the first included angle is equal to the second included angle, and the third conductor edge 30 and the sixth conductor edge 60 are both horizontal straight line edges.

In the present embodiment, the first conductor edge 10, the second conductor edge 20, the fourth conductor edge 40, and the fifth conductor edge 50 are all linear in shape, and in order to improve the back electromotive force harmonic, a projection distance c of any one of the first conductor edge 10, the second conductor edge 20, the fourth conductor edge 40, and the fifth conductor edge 50 in the horizontal direction may be determined according to the projection distance c of the conductor edge in the horizontal directionWhere τ is the pole pitch and v is the order of the harmonic.

In summary, the invention provides a ground coil for a magnetic levitation electromagnetic propulsion system, which can reduce the counter electromotive force harmonic content, reduce the motor thrust pulsation, generate the propulsion force and simultaneously generate no levitation force. Compared with the prior art, the ground coil provided by the invention has the following advantages.

First, the ground coil provided by the invention has the advantages of improving the counter electromotive force waveform and reducing the motor thrust fluctuation.

Secondly, the ground coil provided by the invention can not generate a suspension force while generating a thrust force, and is beneficial to the decoupling design of the three-dimensional force of the electromagnetic propulsion system.

Thirdly, when the vehicle body deviates, because the stator coils on the left side and the right side of the motor rotor magnet are connected in parallel, the resultant force borne by the magnet is self-stable restoring force under the working condition of magnet deviation, and the vehicle body has self-stability.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.