A stator winding and long stator structure incorporating the same, and a linear motor

Abstract

The application discloses a stator winding, a long stator structure comprising the same and a linear motor, and belongs to the field of high-speed maglev, wherein the modular design of A, B and C three-phase winding units facilitates subsequent maintenance and replacement of operating personnel while meeting normal power supply requirements, and the optimization of the three-phase winding unit materials improves the current-carrying capacity of the winding, thereby improving the starting acceleration of the train when starting and meeting the starting requirements of the high-speed maglev train. The application discloses a stator winding, a long stator structure comprising the same and a linear motor, which has a simple overall structure and is convenient to use, meets the basic power supply requirements, and through the improvement of the three-phase winding materials and the structure shape, can load a larger current to meet the requirements of the high-speed maglev train for rapid departure, and has good practical value and application prospect.

Description

Technical Field

[0001] This invention belongs to the field of high-speed maglev, specifically relating to a stator winding and a long stator structure containing the same, as well as a linear motor. Background Technology

[0002] With the advancement of technology and the rapid development of the transportation industry, high-speed maglev technology has gradually transitioned from theory to practice. The basic electrical principle of maglev trains is a linear motor, which consists of a long stator coil on the ground and a moving coil on the vehicle. The long stator coil on the ground needs to provide the levitation, guidance, and propulsion magnetic field to complete the electromagnetic levitation and power drive of the train.

[0003] The ground-mounted long stator coil is made of special aluminum cable and is arranged in the slots of the long stator core according to the arrangement of the three-phase windings. The long stator linear motor of the platform traction section is arranged along the planned line of the platform.

[0004] However, in actual use, especially when the maglev train is leaving the station, in order to obtain the maximum starting acceleration, the current flowing into the linear motor is the maximum allowable current. However, with the increase in the number of departures, the temperature rise of the traction section winding will reach the working limit of the cable, which will cause the cable wound in the iron core slot to be unable to reach the set maximum current. This will result in a decrease in the traction force of the linear motor on the maglev train, that is, a decrease in the traction force of the long stator on the mover set on the maglev train, thus affecting the train's departure speed and departure time. At the same time, due to the limitations of cable materials, common cables are laid in the iron core slot in the form of traditional "enameled wire". After long-term use, they are prone to wear and tear, and due to the influence of the cable bending radius, some cables are prone to leakage reactance, which further affects the maximum current that can pass through the cable. Furthermore, the stator winding of traditional linear motors is wound with a single complete cable. During the winding process, it is necessary to use a winding machine, which is not only complicated in construction procedures but also difficult to maintain, and cannot meet the requirements of long stator windings for high-speed maglev. Summary of the Invention

[0005] In view of one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a stator winding and a long stator structure including the stator, as well as a linear motor. The stator uses copper material as the conductive core and sets an insulating layer on its surface to replace the traditional cable, thereby increasing the current carrying capacity of the traditional winding. The stator also adopts a modular design for the A, B, and C three-phase winding structure, which facilitates subsequent maintenance and replacement by operators.

[0006] To achieve the above objectives, the present invention provides a linear motor winding structure and a long stator structure including the same, comprising at least one set of winding structures, each set of winding structures comprising an A-phase winding unit, a B-phase winding unit and a C-phase winding unit, which are respectively used to connect to the corresponding terminals on the power supply to form a three-phase alternating current.

[0007] Each of the three winding units includes a straight section and connecting sections located at both ends of the straight section; wherein, the straight section is used to be embedded into the slot of the stator core; the connecting section is used to connect to the corresponding terminal on the power supply to realize the energization of a single winding unit;

[0008] The straight sections of the three winding units are parallel to each other and are on the same horizontal plane; the connecting sections of the three winding units are staggered in vertical space and do not affect each other.

[0009] As a further improvement of the present invention, the winding structure comprises multiple sets; the multiple A-phase winding units, B-phase winding units, and C-phase winding units in the multiple sets of winding structures are connected sequentially according to a corresponding relationship; and

[0010] The connection portion of one of the phase A winding unit, phase B winding unit, and phase C winding unit is used to connect to the corresponding terminals on the power supply.

[0011] As a further improvement of the present invention, the connecting portion and the straight portion in the A-phase winding unit and the B-phase winding unit are connected by a bending portion to form a spatially staggered connection between the two A-phase and B-phase connecting portions.

[0012] As a further improvement of the present invention, the two connecting portions and the straight portion in the C-phase winding unit are all on the same plane; and

[0013] The two connecting parts have the same structure and are arranged in a mirror image with the axis of the straight part as the center.

[0014] As a further improvement of the present invention, the two connecting parts in the A-phase winding unit have the same structure and are arranged in a mirror image with the axis of the straight part as the center.

[0015] As a further improvement of the present invention, the vertical height of the connecting portion in the A-phase winding unit is higher than the vertical height of the connecting portion in the B-phase winding unit; and

[0016] The vertical height of the connection part in the B-phase winding unit is higher than the vertical height of the connection part in the C-phase winding unit.

[0017] As a further improvement of the present invention, the A-phase winding unit, the B-phase winding unit, and the C-phase winding unit are all made of pure copper material; and an insulating layer is provided on the surface of each winding unit.

[0018] Based on this, the present invention also provides a long stator structure, which includes multiple sets of the above-mentioned stator windings and iron core, wherein the A, B, and C phase winding units in the multiple sets of stator windings are connected sequentially according to a corresponding relationship; and the connection parts of the A, B, and C phases in one of the winding structures are respectively connected to the corresponding terminals on the power supply.

[0019] For multiple winding structures, multiple slots matching the number of winding structures are opened on the iron core, and the multiple winding structures are arranged in the multiple slots.

[0020] As a further improvement of the present invention, the straight portion is located in the groove on the surface of the iron core; the connecting portion is located outside the iron core and has a gap between it and the outer surface of the iron core.

[0021] Based on this, the present invention also provides a linear motor, which includes the above-mentioned long stator structure and mover, wherein the mover is arranged corresponding to the long stator structure and moves along the laying direction of the long stator structure after three-phase alternating current is applied to the long stator structure.

[0022] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0023] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include:

[0024] (1) The stator winding and the long stator structure including it, as well as the linear motor of the present invention, through the modular design of the A, B, and C three-phase winding units, not only meet the normal power supply requirements but also facilitate subsequent maintenance and replacement by personnel. Furthermore, the assembly process is simpler and faster, eliminating the need for a winding machine and allowing for direct manual assembly, thus simplifying the construction process of the stator winding. Simultaneously, by optimizing the materials of the three-phase winding units, the current carrying capacity of the windings is increased, thereby improving the starting acceleration of the train and meeting the starting requirements of high-speed maglev trains.

[0025] (2) The stator winding and the long stator structure containing it, as well as the linear motor of the present invention, have a simple overall structure and are easy to use. While meeting the basic power supply requirements, the three-phase winding material and structural shape are improved to enable it to carry a larger current to meet the needs of high-speed maglev trains to start quickly. The modular design facilitates subsequent maintenance or replacement by operators, and has good practical value and application prospects. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the overall structure of a single winding in the stator winding in an embodiment of the present invention;

[0027] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0028] 100. Winding structure; 101. Phase A winding unit; 102. Phase B winding unit; 103. Phase C winding unit; 104. Straight section; 105. Connecting section. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] Example:

[0035] Please see Figure 1 In a preferred embodiment of the present invention, the stator winding is used in the platform traction section of the high-speed maglev train and is embedded in the groove of the long stator in the platform traction section. After being energized, it is matched with the mover to realize the rapid start of the maglev train.

[0036] Specifically, in a preferred embodiment of the present invention, the stator winding includes at least one winding structure 100. The winding structure 100 includes an A-phase winding unit 101, a B-phase winding unit 102, and a C-phase winding unit 103. These three winding units are embedded in the slots of the long stator core in a specified order and connected to corresponding terminals on the power supply, thereby transmitting three-phase alternating current within the long stator core. Each of the three winding units includes a straight section 104 and two connecting sections 105. The straight section 104 is embedded in the slot of the core, and the two connecting sections 105 are located at opposite ends of the straight section 104, used for connecting to terminals on the power supply or to connecting sections 105 of corresponding phases in other groups. The straight sections 104 of the three winding units are parallel to each other and on the same horizontal plane; and the connecting sections 105 of the three winding units are staggered in vertical space.

[0037] It is understood that in the above preferred embodiment, only the arrangement of the "three-phase coil" in one segment is given. In actual use, multiple winding structures 100 are usually arranged according to the usage requirements. When the multiple winding structures 100 are connected, they are connected according to the correspondence of AA, BB, CC. The connection between the connection part 105 and the power supply terminal is the same as the correspondence and is a common existing technology. The specific wiring method will not be described in detail here.

[0038] Furthermore, to ensure a more orderly arrangement of the multiple winding structures 100, it is preferable that the connection portions 105 of the A-phase winding unit 101 and the B-phase winding unit 102 are connected to the straight portions 104 via bends, thereby creating an interlacing effect in the vertical space. This prevents the connection portions 105 of the A, B, and C phases from interfering with each other in the vertical space, which would be detrimental to subsequent installation. The bends effectively prevent the A, B, and C phase winding units from interfering with each other in the vertical space, thus achieving an orderly arrangement of the A, B, and C phase winding units.

[0039] In such Figure 1 In the preferred embodiment shown, the two connecting portions 105 in the A-phase winding unit 101 have the same structure and are arranged in a mirror image with the center line of the straight portion 104 as the axis. The overall direction is that "the connecting portion 105 near the top is connected to the straight portion 104 through a downwardly bent portion, and then the other end of the straight portion 104 is bent upward through a bent portion with the same structure, and then connected to another connecting portion 105, thereby realizing the arrangement of "two bent portions on top and the straight portion 104 in the center";

[0040] For the B-phase winding unit 102, the two connecting portions 105 at both ends of its straight portion 104 have different structures. Each connecting portion 105 can be further divided into a first-height connecting member and a second-height connecting member, connected by a bend. The vertical height of the first-height connecting member is higher than that of the second-height connecting member, and the vertical height of the first-height connecting member is on the same vertical plane as the connecting portion 105 of the A-phase winding unit 101, while the vertical height of the second-height connecting member is at the same height as the straight portion 104. Figure 1 As shown, the overall orientation of the B-phase winding unit 102 is as follows: "The second height connector located at the bottom of the A-phase connection part 105 is connected upward to the first height connector through the bending part, the other end of the first height connector is connected downward to the straight part 104 through the bending part, the other end of the straight part 104 is connected to the second height connector, and finally, the second height connector is connected upward to the second height connector through the bending part."

[0041] Finally, for the C-phase winding unit 103, its two connecting parts 105 have the same structure and are arranged in a mirror image with the axis of the straight part 104 as the center, and the two connecting parts 105 and the straight side are on the same vertical plane.

[0042] By optimizing the spatial positions of the three-phase winding units A, B, and C, an alternating winding structure 100 is formed in which the A-phase winding unit 101 is located at the top, the B-phase winding unit 102 is located in the center, and the C-phase winding unit 103 is located at the bottom.

[0043] Furthermore, due to Figure 1The diagram only shows one segment of the winding structure 100; therefore, one end of the connection portion 105 between phases A and B is not connected to the straight portion 104, and only the bent portion is shown for illustration. In actual installation, the other end of the connection portion 105 between phases A and B is also connected to the straight portion 104 via a bent portion, thus forming multiple winding structures 100. As for the phase C winding structure 100, since its connection portion 105 and the straight portion 104 are on the same vertical screen, connecting multiple winding structures 100 is relatively simple; only the straight portion 104 and the connection portion 105 need to be connected sequentially.

[0044] In actual operation, the connecting parts 105, bending parts and straight parts 104 of each phase are often prefabricated to form prefabricated parts and installed on site. When connecting the parts, it is preferred to connect them by welding. After welding, the surface of each part is wrapped with insulation to form a structure that is internally energized and externally insulated.

[0045] Furthermore, it is preferable that the straight sections 104 of each phase are made of pure copper, and that the connecting sections 105 and bending sections are also made of pure copper prefabricated parts, with an insulating layer on their surface. This material modification increases the current-carrying capacity of the windings, thereby improving the starting acceleration of the train. Simultaneously, the pure copper straight sections 104, connecting sections 105, and bending sections preferably possess a certain degree of hardness and can resist a certain degree of deformation.

[0046] In general, the stator winding in the preferred embodiment of the present invention utilizes modular and unitized components, making its installation process more convenient and faster. At the same time, by changing the materials, it can carry a larger current to meet the requirements of rapid start-up of high-speed maglev trains.

[0047] Based on this, the present invention also provides a long stator structure, which includes the winding structure 100 and the iron core in the preferred embodiment above; there are multiple sets of winding structures 100, and the A, B, and C winding units in the multiple sets of winding structures 100 are connected in the manner of "AA", "BB", and "CC"; and corresponding slots are formed on the iron core according to the number of winding structures 100; the straight part 104 in each winding unit is embedded in the slot, and the A, B, and C three-phase connection part 105 in one of the winding structures 100 is used to connect to the power supply terminal, thereby realizing the normal operation of the long stator structure.

[0048] Understandably, after the setup, due to the special structural design of each winding unit, a certain gap will be left between its connection part 105 and the outer periphery of the iron core to facilitate heat dissipation during subsequent operations. Compared with traditional cable winding, its heat dissipation effect is better and the heat dissipation space is larger. Correspondingly, while the coil heat dissipation effect is better, the current it can carry will also be larger, thereby generating a larger magnetic field to drive the maglev train.

[0049] Based on this, the present invention also provides a linear motor, which includes a long stator structure and a mover as described in the preferred embodiment above. The mover is arranged corresponding to the long stator structure, and moves along the laying direction of the long stator structure after three-phase alternating current is applied to the long stator structure.

[0050] In one specific embodiment, the iron core is laid in the track of the maglev train, and the winding structure 100 in the preferred embodiment is wound in the iron core slot in the manner described above. The mover is placed on the maglev train. After the winding structure 100 is energized, a magnetic field is generated to drive the maglev train to move along the track.

[0051] The linear motor winding structure and the long stator structure including it of the present invention have a simple overall structure and are easy to use. While meeting the basic power supply requirements, it can carry a larger current through improvements in the three-phase winding material and structural shape to meet the needs of high-speed maglev trains for rapid departure. The modular design facilitates subsequent maintenance or replacement by operators, and has good practical value and application prospects.

[0052] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A stator winding, characterized in that, It includes at least one set of winding structures (100), each set of winding structures (100) including an A-phase winding unit (101), a B-phase winding unit (102) and a C-phase winding unit (103), which are respectively used to connect to the corresponding terminals on the power supply to form a three-phase alternating current; Each of the three winding units includes a straight section (104) and connecting sections (105) located at both ends of the straight section (104); wherein the straight section (104) is used to be embedded in the slot of the stator core; the connecting section (105) is used to connect to the corresponding terminal on the power supply to realize the energization of a single winding unit; The straight sections (104) of the three winding units are parallel to each other and are on the same horizontal plane; the connecting sections (105) of the three winding units are staggered in vertical space and do not affect each other. The connecting part (105) in the A-phase winding unit (101) and the B-phase winding unit (102) are connected to the straight part (104) through a bending part, so as to form the A-phase and B-phase connecting parts (105) interlacing in space; The two connecting parts (105) and the straight part (104) in the C-phase winding unit (103) are all on the same plane; The two connecting parts (105) at both ends of the straight section (104) of the B-phase winding unit (102) have different structures. The connecting parts (105) can be divided into a first height connecting member and a second height connecting member, and the two connecting members are connected by a bending part. Wherein, the vertical height of the first height connector is higher than that of the second height connector, and the vertical height of the first height connector is on the same vertical plane as the connection part (105) of the A-phase winding unit (101), and the vertical height of the second height connector is at the same height as the straight part (104); The A-phase winding unit (101), B-phase winding unit (102), and C-phase winding unit (103) are all made of pure copper, and each winding unit has an insulating layer on its surface.

2. The stator winding according to claim 1, characterized in that: The winding structure (100) has multiple sets; the multiple A-phase winding units (101), B-phase winding units (102), and C-phase winding units (103) in the multiple sets of winding structures (100) are connected sequentially according to a corresponding relationship; and The connection part (105) of one of the A-phase winding unit (101), B-phase winding unit (102) and C-phase winding unit (103) is used to connect to the corresponding terminal on the power supply.

3. The stator winding according to claim 2, characterized in that, The two connecting parts (105) in the C-phase winding unit (103) have the same structure and are arranged in a mirror image with the axis of the straight part (104) as the center.

4. The stator winding according to claim 3, characterized in that, The two connecting parts (105) in the A-phase winding unit (101) have the same structure and are arranged in a mirror image with the axis of the straight part (104) as the center.

5. A long stator structure, characterized in that, It includes multiple sets of stator windings and iron cores as described in any one of claims 1 to 4, wherein the A, B, and C phase winding units in the multiple sets of stator windings are connected sequentially according to a corresponding relationship; and the A, B, and C phase connection portions (105) in the winding structure (100) of one of them are respectively connected to the corresponding terminals on the power supply. For the multiple sets of winding structures (100), multiple slots matching the number of winding structures (100) are opened on the iron core, and the multiple sets of winding structures (100) are arranged in the multiple slots.

6. The long stator structure according to claim 5, characterized in that, The straight section (104) is located in the groove on the surface of the iron core; the connecting section (105) is located outside the iron core and has a gap between it and the outer surface of the iron core.

7. A linear motor, characterized in that, It includes the long stator structure and the mover as described in claim 5 or 6, wherein the mover is disposed corresponding to the long stator structure and moves along the laying direction of the long stator structure after three-phase alternating current is applied to the long stator structure.

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