A cross-shaped long primary double-sided linear induction motor

Abstract

The invention discloses a cross-shaped structure long primary bilateral linear induction motor, comprising a primary component, a secondary component, a right-angle internal support component, a machine base and a secondary track; the machine base is a long hollow frame structure; there are multiple groups of right-angle internal support components, which are evenly fixedly installed on the inner side of the machine base in the circumferential direction, and a cross-shaped installation space is formed inside the machine base between the multiple groups of right-angle internal support components, and a primary component is fixedly arranged on the side of each right-angle internal support component, and the secondary track is fixedly installed inside the cross-shaped installation space. The secondary component is in a cross structure and is installed in the middle of the cross-shaped installation space through the secondary track, and each cross side of the secondary component passes through the air gap between the upper, lower, left and right primary component pairs; the motor has a compact structure, and the motor size and weight are small; at the same time, the two effective sides of the annular winding are utilized, and the two useless end windings are eliminated, so the loss of the end winding is reduced and the motor efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the field of linear motors, and in particular relates to a long primary bilateral linear induction motor with a cross-shaped structure, which is particularly suitable for occasions where large thrust density requirements and strict volume and weight constraints are imposed. Background Art

[0002] Electromagnetic launch technology is a revolution in launch methods following mechanical energy launch and chemical energy launch. It is a launch technology that uses electromagnetic force to propel objects to high or ultra-high speeds. Electromagnetic launch requires the load to be quickly accelerated to a specified speed within a limited distance, so the launch actuator needs to have characteristics such as large load and high thrust density.

[0003] At present, the linear motors suitable for electromagnetic launch systems mainly include linear induction motors and linear synchronous motors. Among them, linear synchronous motors are divided into permanent magnet type and superconducting excitation type. Although the power factor and efficiency of permanent magnet synchronous linear motors and linear superconducting synchronous motors are higher than those of linear induction motors, they both have their own shortcomings, especially their shortcomings in reliability and environmental applicability, which limit their application in electromagnetic launch occasions. For example, permanent magnet synchronous linear motors have the risk of demagnetization, lack of reliability, and the risk of permanent magnets interfering with the magnetic field of other combat equipment; while linear superconducting synchronous motors have very strict temperature requirements and require the addition of complex and large refrigeration equipment. At present, the prospects for actual engineering applications are poor. The control technology of linear induction motors is simple and easy, the operation is reliable, the maintenance is convenient and the assembly is simple. Therefore, linear induction motors are more suitable for applications in high acceleration fields.

[0004] Most linear induction motors for electromagnetic emission have a long primary double-sided structure, but most motors use stacked windings. The ends of the stacked windings are too long, which cannot provide better performance and efficiency, especially in space-constrained electromagnetic emission applications. In this case, the linear induction motor using annular windings has the advantage of short end winding length, but the annular windings also have the following disadvantages, that is, each annular winding has four sides, of which only the side in the stator slot participates in energy conversion, and the other three sides only serve as ends to form a current loop. This causes unnecessary losses and increases the end leakage reactance, thereby reducing the motor efficiency and power factor. Summary of the invention

[0005] The present invention aims to provide a long primary bilateral linear induction motor with high thrust density, compact structure, light weight, high efficiency and reliable operation.

[0006] In view of the above problems, the technical solution adopted by the present invention is: a cross-shaped structure long primary bilateral linear induction motor, including a primary component, a secondary component, a right-angle internal support component, a machine base and a secondary track, wherein the machine base is a long hollow frame structure; the right-angle internal support component has multiple groups, which are evenly fixedly installed on the inner side of the machine base in the circumferential direction, and a cross-shaped installation space is formed inside the machine base between the multiple groups of right-angle internal support components, and a primary component is fixedly arranged on the side of each right-angle internal support component, and the primary component includes an iron core and a winding wound on the iron core, and at least one primary component pair is formed at the top, bottom, left and right of the cross-shaped installation space; the secondary track is fixedly installed inside the cross-shaped installation space, and the secondary component has a cross structure, and is installed in the middle of the cross-shaped installation space through the secondary track, and each cross side of the secondary component passes through the air gap between the upper, lower, left and right primary component pairs;

[0007] During operation, the primary three-phase winding is energized, generating a traveling wave magnetic field in the air gap. At this time, eddy currents are induced on the secondary of the cross-shaped structure. The interaction between the eddy currents and the air gap magnetic field generates electromagnetic thrust, which pushes the cross-shaped secondary to move in a straight line along the axial direction.

[0008] Furthermore, the right-angle internal support assembly includes a long right-angle support plate assembly and a trapezoidal reinforcement plate evenly distributed along the longitudinal direction of the right-angle support plate assembly; the right-angle support plate assembly includes a right-angle support plate and a metal connecting block fixedly arranged on the back of the right-angle support plate, and the other end of the metal connecting block is fixedly connected to the iron core.

[0009] Furthermore, the secondary component is assembled from three aluminum plates, one of which is a whole plate and the other two are bent plates, which are fixed by rivets. The secondary structure is simple, consisting only of solid aluminum plates, does not require dragging wires for power supply, and is light in weight.

[0010] Furthermore, the machine base includes a long longitudinal frame with an octagonal cross-section, a plurality of transverse frames evenly spaced along the longitudinal frame, and a base arranged at the bottom. In this case, the number of right-angle internal support components is 4, and the 4 right-angle internal support components are spaced apart on the eight inner side surfaces of the long longitudinal frame (51), and a primary component pair is correspondingly arranged in each of the four directions of top, bottom, left and right.

[0011] Furthermore, a secondary rail mounting hole is opened on the machine base, and the base includes a base substrate and a longitudinal reinforcement material fixedly arranged below the base substrate.

[0012] Furthermore, the secondary track includes a left track, a right track and a lower track respectively installed at the left end, the right end and the lower end of the secondary component. The structures of the left track, the right track and the lower track are the same. The left track includes a long rectangular slide block made of tetrafluoroethylene material with a slide groove and an adjustment gasket. The left end, the right end and the lower end of the secondary component are respectively inserted into the corresponding slide grooves in their respective directions.

[0013] Furthermore, the right-angle internal support assembly is fixedly connected to the machine base through a connecting block, and the connecting block has four waist holes (two groups), and the two groups of waist holes are perpendicular to each other. In order to compensate for the dimensional deformation that is no longer processed by welding, the gasket is made of flexible material with good elasticity.

[0014] Furthermore, in order to reduce the size and weight of the motor, the core adopts a slotless structure, and the core is made of rectangular silicon steel sheets bonded and laminated and fixed on the core mounting frame.

[0015] Furthermore, the winding is composed of flat copper wire and an insulating layer. The coil of each phase of the winding is formed by a flat copper wire with an insulating layer through a winding die and then arranged on the iron core or directly wound on the iron core. After winding, the surface of the iron core is filled with glue. After pouring, the coil and the glue layer are an integral structure. The pouring material fills the gaps between single coils and between the winding and the iron core, so that the winding and the iron core form a whole; the coil segments are connected together on the outside after each group of iron cores are installed; the pouring material is an epoxy resin material.

[0016] Furthermore, in order to reduce the end length of the annular winding, thereby reducing the loss and weight of the motor, the annular winding only retains two effective sides.

[0017] The beneficial effects and features of the present invention are:

[0018] (1) The cross-shaped long primary double-sided linear induction motor provided by the present invention adopts a cross-shaped secondary structure. Four sets of double-sided primaries act together on the same secondary, and the thrust generated by the motor can be approximately regarded as the sum of the thrusts generated by four double-sided linear induction motors under the same input current. In addition, because the end winding occupies a very small space, the motor volume is much smaller than the sum of the volumes of the four double-sided linear induction motors, so it has a higher thrust density, and the motor structure is compact, and the motor size and mass are small.

[0019] (2) The cross-shaped long primary double-sided linear induction motor provided by the present invention adopts a ring winding structure. The use of a ring winding form avoids the disadvantage that the coil end protrudes higher than the motor core when the conventional winding is arranged, and further reduces the size of the motor. At the same time, the two effective sides of the ring winding are utilized, and the two useless end windings are eliminated, so the loss of the end winding is reduced and the motor efficiency is improved.

[0020] (3) The cross-shaped long primary double-sided linear induction motor provided by the present invention adopts a slotless core structure. The slotless core structure removes the core teeth, reduces the core mass, and weakens the saturation problem of the core teeth.

[0021] (4) The cross-shaped long primary bilateral linear induction motor provided by the present invention has a simple secondary structure, which is only a solid aluminum plate, does not require a towing wire for power supply, and has a light secondary weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0023] Figure 2 for Figure 1 The schematic diagram of the structure is enlarged at the dotted line;

[0024] Figure 3 for Figure 1 Schematic diagram of the cross-section structure (to clearly express the base structure, the primary assembly, the right-angle internal support assembly, and the secondary track are not shown);

[0025] Figure 4 Figure 1 A schematic cross-sectional structure diagram of ;

[0026] Figure 5 for Figure 4 Schematic diagram of component explosion markings;

[0027] Figure 6 A schematic diagram of a cross-shaped secondary structure of a preferred embodiment of the present invention;

[0028] Figure 7 It is a structural schematic diagram of the combination of the core, winding and right-angle support plate assembly of a preferred embodiment of the present invention;

[0029] Figure 8 A schematic diagram of the winding structure of a preferred embodiment of the present invention;

[0030] Fig. 9 It is a schematic diagram of the structure of the enlarged winding of a preferred embodiment of the present invention;

[0031] Fig.10 for Figure 7 A schematic diagram of the structure from another angle;

[0032] Fig.11 A schematic diagram of the connection between the core and the metal key of a preferred embodiment of the present invention;

[0033] Fig.12 A schematic diagram of the structure of a base of a preferred embodiment of the present invention;

[0034] Fig.13 This is a schematic diagram of the structure of a rectangular slide block in a preferred embodiment of the present invention;

[0035] Fig.14 for Fig.13 The enlarged structural diagram on the right;

[0036] Fig.15 This is a structural schematic diagram of a connecting block in a preferred embodiment of the present invention;

[0037] The reference numerals in the figure respectively represent: 1-core, 2-secondary assembly, 3-winding, 4-right-angle support plate assembly, 41-right-angle support plate, 42-metal connecting block, 5-base, 51-longitudinal frame, 52-transverse frame, 53-base, 531-base substrate, 532-longitudinal reinforcement material, 54-secondary rail mounting hole, 6-secondary rail, 61-left rail, 611-rectangular slide block, 612-adjusting gasket, 62-right rail, 63-lower rail, 7-assembly hole, 8-trapezoidal reinforcement plate. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Please refer to Figure 1-Figure 5 , the present invention relates to a cross-shaped structure long primary bilateral linear induction motor, comprising a primary assembly, a secondary assembly, a right-angle internal support assembly, a machine base 5 and a secondary track 6;

[0040] The base 5 is a long hollow frame structure; there are multiple groups of right-angle internal support components, which are evenly fixed on the inner side of the base 5 in the circumferential direction, and a cross-shaped installation space is formed inside the base 5 between the multiple groups of right-angle internal support components. A primary component is fixedly arranged on the side of each right-angle internal support component, and the primary component includes an iron core 1 and a winding 3 wound on the iron core. At least one primary component pair is formed at the top, bottom, left and right of the cross-shaped installation space; the secondary rail 6 is fixedly installed inside the cross-shaped installation space, and the secondary component 2 is a cross structure, which is installed in the middle of the cross-shaped installation space through the secondary rail 6, and each cross side of the secondary component 2 passes through the air gap between the upper, lower, left and right primary component pairs.

[0041] The right-angle internal support assembly includes a long right-angle support plate assembly 4 and a trapezoidal reinforcement plate 8 evenly distributed along the longitudinal direction of the right-angle support plate assembly 4; the right-angle support plate assembly 4 includes a right-angle support plate 41 and a metal connecting block 42 fixedly arranged on the back of the right-angle support plate, and the other end of the metal connecting block 42 is fixedly connected to the iron core 1.

[0042] Please refer to Figure 6 The secondary 2 is a cross-shaped structure, and is assembled from three aluminum plates, one of which is a whole plate and the other two are bent plates, which are fixed by rivets. The secondary structure is simple, only a solid aluminum plate, does not require a towing wire for power supply, and is light in weight.

[0043] Please refer to Figure 7 The core 1 is composed of two groups of silicon steel sheets, and the winding coil 3 is arranged on the core 1. In order to reduce the size and weight of the motor, the core 1 adopts a slotless structure. The core 1 is made of rectangular silicon steel sheets bonded and laminated and fixed on the right-angle support plate assembly 4.

[0044] Please refer to Figure 8 , Fig. 9 The winding 3 is composed of flat copper wire and insulating layer. Each phase coil of the winding is formed by flat copper wire with insulating layer through winding die and arranged on the iron core 1 or directly wound on the iron core 1. After winding, the surface of the iron core 1 is filled with glue. After casting, the coil and the glue layer are an integral structure. The casting material fills the gap between the single coil and between the winding and the iron core, so that the winding and the iron core form a whole. The coil segments are connected outside after each group of iron cores 1 are installed. The casting material is epoxy resin material. In order to reduce the end length of the annular winding, thereby reducing the loss and weight of the motor, the winding 3 only retains two effective sides.

[0045] Please refer to Fig.10 , Fig.11 The core 1 is fixed on the right-angle support plate 41. The right-angle support plate 41 cooperates with the connecting block 7 to connect the core 1 and the base 5 and enhance the strength of the core structure.

[0046] Please refer to Fig.12 The machine base 5 includes a long longitudinal frame 51 with an octagonal cross-section, a plurality of transverse frames 52 evenly spaced along the longitudinal frame, and a base 53 arranged at the bottom. At this time, the number of right-angle internal support components is 4, and the 4 right-angle internal support components are spaced on the eight inner side surfaces of the long longitudinal frame 51, and a primary component pair is arranged in each of the four directions of upper, lower, left and right. The machine base 5 is welded in sections to play a supporting and installing role. In order to reduce the processing cost, the machine base 5 is no longer processed after welding, the welding quality is strictly controlled during welding, and the welding deformation is required to be as small as possible. A secondary track mounting hole 54 is opened on the machine base 5, and the base 53 includes a base substrate 531 and a longitudinal reinforcing material 532 fixedly arranged below the base substrate.

[0047] Please refer to Figure 13-14The secondary track 6 includes a left track 61, a right track 62 and a lower track 63 which are respectively installed at the left end, the right end and the lower end of the secondary component 2. The structures and materials of the left track 61, the right track 62 and the lower track 63 are the same. The left track 61 includes a long rectangular slide block 611 (friction pair) made of polytetrafluoroethylene material with a slide groove. The left end, the right end and the lower end of the secondary component 2 are respectively inserted into the corresponding slide grooves in their respective directions; the long rectangular slide block 611 is made of polytetrafluoroethylene material and is segmented according to the length of a single-section iron core. The back of the long rectangular slide block 611 is connected to the machine base. An adjustment gap is left between the back of the long rectangular slide block 611 and the machine base (adjusting gaskets are used to adjust the distance). Adjusting gaskets are set in the adjustment gap. The adjusting gaskets are only installed at the bolt position with the secondary track mounting hole 54 (not using a whole strip for easy adjustment and installation).

[0048] Please refer to Fig.15 The connecting block 7 is a fixing member for connecting the core 1 and the base 5, and is made of a gasket material with the same shape, and the gasket is made of a flexible material with good elasticity. The connecting block has four waist holes (two groups), and the two groups of waist holes are perpendicular to each other to compensate for the dimensional deformation of welding.

[0049] It will be easily understood by those skilled in the art that the above description is only 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 in the protection scope of the present invention.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the structural relationship and principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A cross-shaped long primary double-sided linear induction motor, characterized in that : comprising a primary assembly, a secondary assembly, a right-angle internal support assembly, a base (5) and a secondary track (6); The machine base (5) is a long hollow frame structure; there are multiple groups of right-angle internal support components, which are evenly fixedly installed on the inner side of the machine base (5) in the circumferential direction, and a cross-shaped installation space is formed inside the machine base (5) between the multiple groups of right-angle internal support components. A primary component is fixedly arranged on the side of each right-angle internal support component, and the primary component includes an iron core (1) and a winding (3) wound on the iron core. At least one primary component pair is formed at the top, bottom, left and right of the cross-shaped installation space; the secondary rail (6) is fixedly installed inside the cross-shaped installation space, and the secondary component (2) is in a cross structure and is installed in the middle of the cross-shaped installation space through the secondary rail (6), and each cross side of the secondary component (2) passes through the air gap between the upper, lower, left and right primary component pairs; The right-angle internal support assembly comprises a long strip-shaped right-angle support plate assembly (4) and trapezoidal reinforcement plates (8) evenly distributed along the longitudinal direction of the right-angle support plate assembly (4); the right-angle support plate assembly (4) comprises a right-angle support plate (41) and a metal connection block (42) fixedly arranged on the back of the right-angle support plate, and the other end of the metal connection block (42) is fixedly connected to the iron core (1); The secondary component (2) is assembled from three aluminum plates, one of which is a whole plate and the other two are bent plates, which are fixed by rivets and do not require a towing wire for power supply.

2. The cross-shaped long primary double-sided linear induction motor according to claim 1, characterized in that The machine base (5) comprises a long longitudinal frame (51) with an octagonal cross section, a plurality of transverse frames (52) evenly spaced along the longitudinal frame, and a base (53) arranged at the bottom. In this case, the number of right-angle internal support components is 4, and the 4 right-angle internal support components are spaced apart on the eight inner side surfaces of the long longitudinal frame (51), and a primary component pair is arranged in each of the four directions of top, bottom, left and right.

3. The cross-shaped long primary double-sided linear induction motor according to claim 2, characterized in that: The machine base (5) is provided with a secondary rail mounting hole (54), and the base (53) comprises a base substrate (531) and a longitudinal reinforcing material (532) fixedly arranged below the base substrate.

4. The cross-shaped long primary double-sided linear induction motor according to claim 1, characterized in that: The secondary track (6) comprises a left track (61), a right track (62) and a lower track (63) respectively mounted on the left end, the right end and the lower end of the secondary component (2); the left track (61), the right track (62) and the lower track (63) have the same structure and material; the left track (61) comprises a long rectangular slide block (611) made of tetrafluoroethylene material with a slide groove and an adjustment gasket (612); the left end, the right end and the lower end of the secondary component (2) are respectively inserted into the slide grooves corresponding to their respective directions.

5. The cross-shaped long primary double-sided linear induction motor according to claim 1, characterized in that The right-angle internal support assembly is fixedly connected to the machine base (5) via a connecting block (7), and the connecting block has four waist holes, and the two groups of waist holes are perpendicular to each other.

6. The cross-shaped long primary double-sided linear induction motor according to claim 1, characterized in that The core (1) adopts a slotless structure. The core (1) is formed by bonding and laminating rectangular silicon steel sheets. The core (1) is fixed on a right-angle support plate assembly (4).

7. The cross-shaped long primary double-sided linear induction motor according to claim 1, characterized in that The winding (3) is composed of a flat copper wire and an insulating layer. The coil of each phase of the winding is formed by a flat copper wire with an insulating layer through a winding die and then arranged on the iron core (1) or directly wound on the iron core (1). After the winding is completed, the surface of the iron core (1) is filled with glue. After pouring, the coil and the glue layer form an integral structure. The pouring material fills the gaps between the individual coils and between the winding and the iron core, so that the winding and the iron core form a whole. The coil segments are connected together outside after each group of iron cores (1) are installed. The pouring material is an epoxy resin material.

8. The cross-shaped long primary double-sided linear induction motor according to claim 1, characterized in that : The toroidal winding (3) only retains two effective sides.

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