Linear motor

Abstract

The linear motor includes a primary member including a plurality of armature modules, and a secondary member having a permanent magnet module including a plurality of permanent magnets arranged while alternately changing poles in the traveling direction. Each armature module includes a magnetic core including two or more protrusions, and a coil wound around the magnetic core through which a current having the same phase flows. Taking P permanent magnets and S armature modules as one unit, a power source having a predetermined phase difference is applied to the coils of each armature module so as to generate thrust. With the permanent magnet module disposed between two protrusions of the armature module, either the primary member or the secondary member becomes a mover and the other becomes a stator, and they move relative to each other by the generated thrust. The plurality of armature modules include three or more armature blocks in which two or more armature modules through which a current having the same phase flows are adjacent to each other in the traveling direction. In each armature block, a first rod penetrates through one or more first holes formed in the magnetic core of each armature module, and both side ends of the first rod are fixed to the armature modules at both side ends of the armature block. A second rod penetrates through one or more second holes formed in the magnetic core of each armature module, and at least one or more of both side ends of the second rod are fixed by fastening means, whereby three or more armature blocks are coupled.

Description

Technical Field

[0001] This specification relates to a linear motor.

Background Art

[0002] Generally, a linear motor, that is, a linear electric motor, has a structure that generates thrust between a mover and a stator facing each other linearly. A permanent magnet type linear motor generates thrust in a desired direction by arranging a permanent magnet on either the mover or the stator and sending alternating polyphase power to the other to cause an electromagnetic force to act between them.

[0003] Conventionally, most linear motors have a structure in which the magnetic flux emerging from the salient poles of the armature core forms a magnetic closed circuit through the permanent magnet and the yoke to generate attractive and repulsive forces and thus generate thrust. Therefore, the permanent magnet is arranged between the salient pole and the yoke and mostly adheres to the yoke.

[0004] The applicant of this specification has filed a closed-type and open-type linear motor including a primary member composed of a plurality of armature modules arranged in a row in the traveling direction and a secondary member including a plurality of permanent magnet modules including a plurality of permanent magnets arranged while alternately changing poles in the traveling direction as Korean Patent Application Nos. 10-2010-0081522 and 10-2010-0129947 (corresponding to Patent Documents 1 and 2).

[0005] In the linear motors described in Korean Patent Application Nos. 10-2010-0081522 and 10-2010-0129947, since the armature modules must be separated from each other at intervals corresponding to the phase difference based on the traveling direction, spacers must be inserted between each of the armature modules, and the coils of the armature modules supplied with current of the same phase must be connected to each other.

[0006] For these reasons, assembling the primary member is quite troublesome and it is not easy to convert to an automated process.

[0007] Furthermore, in armature modules, the magnetic core around which the coils are wound is formed by layering ferromagnetic iron plates, but because the thickness of the iron plates supplied by steel companies is not constant, the thickness of the magnetic core formed by layering numerous iron plates is not constant.

[0008] If the thickness of each armature module is not uniform, the spacing between armature modules will differ. This means that the phase difference between armature modules will deviate from the phase difference of the supplied current.

[0009] In order to maintain a constant phase difference between armature modules, the physical spacing between them must be adjusted. To do this, the thickness of each armature module must be measured, and the thickness of the spacers must be adjusted accordingly.

[0010] Thus, the assembly of primary components can be time-consuming and costly, making it difficult to improve assembly accuracy. [Overview of the project] [Problems that the invention aims to solve]

[0011] This specification is made in view of the above circumstances, and its purpose is to improve the assembly of primary members composed of armature modules in a linear motor in which multiple armature modules are arranged in a line in the direction of travel.

[0012] Another objective of this specification is to provide a linear motor that reduces the risk of coil breakage. [Means for solving the problem]

[0013] A linear motor according to one embodiment of this specification comprises a primary member including a plurality of armature modules, and a secondary member having a permanent magnet module including a plurality of permanent magnets arranged with alternating poles in the direction of travel, each armature module including a magnetic core including two or more protrusions, and a coil wound around the magnetic core through which a current of the same phase flows, with P permanent magnets and S armature modules forming a single unit, a power supply having a predetermined phase difference to generate thrust applied to the coil of each armature module, and with the permanent magnet module positioned between two protrusions of the armature module, either the primary member or the secondary member becomes the moving element. The other side becomes the stator, and moves relative to each other by the thrust generated, and the multiple armature modules include three or more armature blocks in which two or more armature modules, each having a coil through which a current of the same phase flows, are adjacent to each other in the direction of travel, and in each armature block, a first rod passes through one or more first holes formed in the magnetic core of each armature module, and both ends of the first rod are fixed to the armature modules at both ends of the armature block, and a second rod passes through one or more second holes formed in the magnetic core of each armature module, and at least one of the ends of the second rod is fixed by fastening means, thereby connecting three or more armature blocks. The device further comprises a base for fixing an armature block, the base including two first walls positioned parallel to the armature module and two second walls positioned side by side along the direction of travel, the first walls including a third hole through which a second rod passes, and the two first walls and three or more armature blocks are coupled to each other by fastening nuts to threaded portions formed on at least one end of the second rod. It is characterized by the following: [Effects of the Invention]

[0014] Therefore, since multiple armature modules supplied with the same phase current can be pre-assembled in armature block units, the work of connecting the coils of armature modules with the same phase after assembling the primary components can be reduced, enabling process automation and improving assembly efficiency.

[0015] Furthermore, by molding the coils wound around the magnetic core of the armature module, the risk of coil breakage due to vibration during high-speed operation can be reduced, thereby reducing the causes of linear motor failure, maintaining stable performance, and extending its lifespan. [Brief explanation of the drawing]

[0016] [Figure 1] This figure shows the open-type linear motor described in Korean Patent Application No. 10-2010-0081522 and Korean Patent Application No. 10-2010-0129947, filed by the applicant of this specification. [Figure 2] This figure shows a linear motor described in Korean Patent Application No. 10-2011-0020599, filed by the applicant of this specification. [Figure 3] Figures 1 and 2 illustrate the operating principle of the linear motor, in which linear thrust is generated by a combination of a primary member composed of three armature modules and multiple permanent magnets. [Figure 4] This diagram shows a linear motor in which nine armature modules, which constitute the primary components, are arranged in a distributed manner. [Figure 5a] This is a plan view of the armature module of a linear motor, as seen from the direction of travel. [Figure 5b] This figure shows an example in which a first rod is passed through a first hole formed in multiple armature modules. [Figure 5c] This figure shows the assembled armature block, with the first rod passing through the first holes formed in multiple armature modules and spacers. [Figure 6] This diagram shows the armature block connected to the base using a sliding mechanism. [Figure 7] This diagram shows the armature block coupled to the base, the first wall, and the second wall. [Figure 8] This diagram shows a plan view of the first wall as seen from the direction of travel of the linear motor, compared to a plan view of the armature module. [Figure 9] This diagram shows the primary component of a linear motor, where the armature block is composed of five armature modules, each consisting of two salient poles. [Modes for carrying out the invention]

[0017] The various embodiments of the linear motor in this specification are briefly and clearly described as follows.

[0018] A linear motor according to an embodiment includes a primary member including a plurality of armature modules, and a secondary member having a permanent magnet module including a plurality of permanent magnets arranged with alternating poles in the traveling direction. Each armature module includes a magnetic core including two or more protrusions, and a coil wound around the magnetic core through which a current of the same phase flows. Taking P permanent magnets and S armature modules as one unit, a power source having a predetermined phase difference is applied to the coils of each armature module so that thrust is generated. With the permanent magnet module arranged between two protrusions of the armature module, either the primary member or the secondary member becomes the mover and the other becomes the stator, and they move relative to each other by the generated thrust. The plurality of armature modules include three or more armature blocks in which two or more armature modules through which a current of the same phase flows in the coils are adjacent to each other in the traveling direction. In each armature block, a first rod penetrates through one or more first holes formed in the magnetic core of each armature module, and both side ends of the first rod are fixed to the armature modules at both side ends of the armature block. A second rod penetrates through one or more second holes formed in the magnetic core of each armature module, and at least one or more of both side ends of the second rod are fixed by fastening means, whereby three or more armature blocks can be coupled.

[0019] In one embodiment, at least one side end of the first rod is formed as a rivet and can be joined to the armature module.

[0020] In one embodiment, three or more armature blocks can be coupled by fastening a nut to a threaded portion formed at least on one side end of the second rod.

[0021] In one embodiment, the linear motor can further include a base for fixing the armature block.

[0022] In one embodiment, the magnetic core of the armature module includes a second projection that protrudes in the opposite direction to the direction in which the first projection protrudes, and the armature block can be fixed to the base by the second projection of the armature module and a groove formed in the base being connected in a sliding manner.

[0023] In one embodiment, the base includes two first walls positioned parallel to the armature module and two second walls positioned side by side along the direction of travel, the first walls communicating with a second hole in the magnetic core and including a third hole through which a second rod passes, and the two first walls and three or more armature blocks can be coupled to each other by fastening a nut to a threaded portion formed on at least one end of the second rod.

[0024] In one embodiment, the coil is wound around the protrusion closer to the connecting portion that connects the protrusions than to the end of the protrusion, the first and second walls are erected from the bottom of the base at a first height or greater that can obstruct the coil, and can be molded with resin from the bottom of the base to the first height.

[0025] In one embodiment, a fourth hole for pulling out the coil can be formed in one of the two first walls at a position lower than the first height.

[0026] In one embodiment, the linear motor may further include a first spacer inserted between two armature modules and a second spacer inserted between two armature blocks.

[0027] In one embodiment, the first and second holes can be formed in the respective protrusions of the magnetic core and in the connecting portions that connect the protrusions.

[0028] In one embodiment, the first and second holes of the protruding portion can be formed closer to the end of the protruding portion than the connecting portion.

[0029] In one embodiment, the first and second holes in the connecting portion may be formed at positions corresponding to each protruding portion, or only one hole may be formed in the center of the connecting portion. Modes for carrying out the invention

[0030] Hereinafter, preferred embodiments of linear motors according to this specification will be described in detail with reference to the attached drawings.

[0031] In the linear motor described in Korean Patent Application No. 10-2010-0081522 and Korean Patent Application No. 10-2010-0129947, in the open-type linear motor shown in Figure 1, the connecting portion 11 of the magnetic core of the armature module 10 is not C-shaped to surround the secondary member, the permanent magnet module 20, but for example, is straight, and the multiple salient poles 12, which are part of the magnetic core, protrude from the connecting portion 11 in the same direction, for example, at a right angle, and the multiple permanent magnet modules 20, which are secondary members, also have a shape that protrudes toward the connecting portion 11 between each salient pole 12 which are arranged side by side. When the coil 13 is wound around each salient pole 12, it can be wound closer to the connecting portion 11 than the end of the salient pole 12 (a position where the permanent magnet 21 protruding toward the connecting portion 11 does not reach) or it can be wound around the connecting portion 11 between two salient poles 12.

[0032] Other linear motors described in Korean Patent Application No. 10-2010-0081522 and Korean Patent Application No. 10-2010-0129947 have different protrusion angles of the salient poles 12 relative to the connecting portion 11 of the armature module 10, which results in high mold manufacturing costs and limits the ability to improve precision. However, in the linear motor of Figure 1, all salient poles 12 in each armature module 10 are fixed at the same angle as the connecting portion 11, for example, a right angle, and each permanent magnet module 20 is also fixed at the same angle as the permanent magnet base 22, for example, a right angle, thus improving manufacturing precision and reducing mold manufacturing costs.

[0033] The linear motor described herein is a modified version of the open-type linear motor shown in Figure 1, as described in Korean Patent Application No. 10-2010-0081522 and Korean Patent Application No. 10-2010-0129947, with the addition of a permanent magnet movable type.

[0034] Figure 2 shows a linear motor described in Korean Patent Application No. 10-2011-0020599, invented by the inventors of this specification, which may be configured to have a primary member including a coil 13 that generates magnetic flux and a secondary member including a permanent magnet 21 that crosses the magnetic flux. The operating principle is the same as that of the linear motor in Figure 1, except that the number of salient poles 12 and the number of permanent magnet modules 20 have been reduced to 2 and 1, respectively.

[0035] Figure 3 shows the linear motors of Figures 1 and 2, illustrating the operating principle by which linear thrust is generated through a combination of a primary member composed of three armature modules and multiple permanent magnets. It also illustrates the principle by which thrust is generated in the direction of travel through a combination of two or more armature modules and permanent magnet modules. For example, if three armature modules 10U, 10V, and 10W are associated with two permanent magnets N and S, the combination will be as shown in the upper diagram of Figure 3, with three phases of armature modules and two poles of permanent magnets.

[0036] In Figure 3, U, V, and W are the salient poles 12 of one side of the three armature modules 10U, 10V, and 10W shown in Figures 1 and 2, arranged in the direction of travel, and S / N is the arrangement of permanent magnets 21 positioned at the locations corresponding to salient poles U, V, and W.

[0037] A single-phase current is supplied to the coil 13 of each armature module 10. In the case of three phases, a current with a 120-degree phase difference relative to adjacent modules can be applied to the coil 13 of each armature module 10.

[0038] Furthermore, as shown in the upper diagram of Figure 3, if the spacing between the poles of the permanent magnets S or N, which are arranged alternately in the direction of travel, is τ (1 / 2 period, 180 degrees), then the three armature modules 10 can be arranged at intervals corresponding to 2 / 3τ (120 degrees).

[0039] When an alternating current with a peak value (P) is passed through the coil wound around salient pole V, which is located between the south and north poles of the permanent magnet, in the (+) direction, salient pole V becomes a north pole. When an alternating current with a magnitude of peak value (P) / square root (2) is passed through the coils wound around salient poles U and W in the (-) direction, salient poles U and W become south poles. As a result, salient pole V, which is a north pole, acts an attractive force on the south pole of the permanent magnet and a repulsive force on the north pole of the permanent magnet, causing the permanent magnet to move to the right. Salient poles U and W, which have become south poles due to a magnetic force smaller than that of salient pole V, act a repulsive force and an attractive force on the south and north poles of the permanent magnet, respectively, but they cancel each other out and do not affect the direction of movement.

[0040] As the permanent magnet 21 moves by 2 / 3τ, the salient pole W is now positioned between the S pole and N pole of the permanent magnet. At this moment, a current with a phase advance of 120 degrees flows through the coils 13 of each salient pole 12. By passing an alternating current with a peak value (P) in the (+) direction through the coil wound around salient pole W, salient pole W becomes an N pole, and by passing an alternating current with a magnitude of peak value (P) / square root (2) in the (-) direction through the coils wound around salient poles U and V, salient poles U and V become S poles. The salient pole W, now an N pole, exerts an attractive force on the S pole of the permanent magnet and a repulsive force on the N pole of the permanent magnet, thereby moving the permanent magnet 21 to the right. Similarly, salient poles U and V, which have become S poles due to a magnetic force smaller than that of the N pole of salient pole W, exert attractive and repulsive forces on the N pole and S pole of the permanent magnet, respectively, but these forces cancel each other out.

[0041] By repeating this process, the permanent magnet 21 moves to the right. That is, the three-phase current applied to each armature module 10 generates a moving magnetic field at salient poles U, V, and W, and thus a thrust is generated in the permanent magnet 21 that moves to the right.

[0042] In an ideal model, the thrust required to move the permanent magnet 21 is proportional to the sum of the surface areas in contact between the salient poles 12 and the permanent magnet 21, and also proportional to the number of armature modules 10 arranged in the direction of travel. It is also proportional to the magnitude of the current applied to the coil 13, the number of times the coil 13 is wound around the salient poles 12, and the magnitude of the magnetic force of the permanent magnet 21.

[0043] The first example in Figure 3 (upper diagram) is an example of a basic combination of a 3-phase armature module and a 2-pole permanent magnet, while the second example in Figure 3 (lower diagram) is an extension of the basic combination, an example of a combination of a 3-phase armature module and a 4-pole permanent magnet. The principle of thrust generation is the same, and combinations such as 3-phase 8-pole and 10-pole are also possible.

[0044] In general, thrust is generated based on a combination of the number S of armature modules 10, which is a multiple of the motor constant, and the number P of permanent magnets 21, which is a multiple of 2 (N pole and S pole). Here, the motor constant is 3 when the armature is driven by a 3-phase power supply, and 5 when driven by a 5-phase power supply, and is generally an odd number greater than or equal to 3. The motor constant determines the phase difference of the current applied to the coil 13 of each armature module 10.

[0045] Of course, if we define the unit length of the primary member as the length (length in the direction of movement) of the portion where S armature modules and P permanent magnets are positioned opposite each other with an air gap in between, then when either the primary member composed of a large number of armature modules 10 or the secondary member composed of a large number of permanent magnets 21 is configured to be longer than the unit length, an effective distance can be secured that generates the thrust necessary to move the movable element.

[0046] In other words, by configuring the overlapping length of the primary and secondary members to be longer than the unit length (by having S or more armature modules or P or more permanent magnets), an effective distance for thrust generation is secured, and the thrust can be increased in proportion to the area where the primary and secondary members face each other.

[0047] Three-phase currents are applied to each armature module 10 of the primary member in the following order in the direction of travel: UuU (or uUu) (U-phase group), VvV (or vVv) (V-phase group), and WwW (or wWw) (W-phase group). Here, lowercase letters indicate that a current with the opposite phase to that of uppercase letters is supplied.

[0048] Here, supplying currents in opposite phases could mean supplying different currents with a 180-degree phase difference to the coils wound around the other salient poles, or it could mean supplying currents with the same phase to the coils but winding them in different directions around the salient poles. However, from the perspective of driving an electric motor, the latter is far more advantageous because it involves supplying two currents with a 180-degree phase difference simultaneously through a single line.

[0049] Since the primary components are not connected to each other and consist of independent armature modules 10, when the same amount of power is supplied to each armature module 10, an independent magnetic flux of the same amount flows through each armature module 10, reducing the deviation in thrust generated through each armature module 10 and thus reducing thrust ripple.

[0050] The amount of magnetic flux passing through the salient pole 12 and the permanent magnet 21 is proportional to the area of ​​the region where the salient pole 12 and the permanent magnet 21 face each other, assuming that the distribution of magnetic flux entering or leaving the salient pole 12 is constant.

[0051] The cross-section of the permanent magnet 21 through which the magnetic flux emitted from or entering the salient pole 12 of the armature module 10 passes is not limited to a rectangle or parallelogram, but can also be a rhombus, circle, or ellipse, and an octagonal shape with chamfered corners of a rectangle or parallelogram is also possible.

[0052] On the other hand, most linear motors other than the linear motors of this specification have a structure in which the armature modules constituting the primary member are connected to each other without being separated. However, in the linear motors of this specification, since the armature modules are separated to each other, a spacing must be maintained between the armature modules in order to maintain a predetermined phase difference with respect to adjacent armature modules, and for this purpose a spacer is inserted between the two armature modules.

[0053] Multiple armature modules can be assembled sequentially by forming holes in the salient poles and connecting parts of the magnetic core constituting the armature module, placing a spacer with holes between two armature modules, and inserting a rod into the holes in the magnetic core and spacer. After passing the rod through all the armature modules constituting the primary member, the assembly of the armature module can be completed by fixing both sides of the rod with fastening means, such as nuts.

[0054] After sequentially arranging the armature modules, there is the cumbersome requirement to connect the coils of armature modules with the same phase in series one by one.

[0055] Furthermore, when forming a magnetic core by layering multiple iron plates, the thickness of the iron plates is not uniform, which changes the thickness of the magnetic core, i.e., the armature module. This presents a problem in that the phase difference between adjacent armature modules changes.

[0056] In low-precision linear motors, such differences do not cause significant problems, but when precision is required, the distance between adjacent armature modules must be precisely matched. This requires measuring the thickness of each magnetic module and adjusting the spacer thickness accordingly, making it difficult to simplify the assembly process of the primary components.

[0057] In consideration of these challenges, firstly, in one embodiment of the present invention, two or more armature modules of the same phase are arranged in sequence and independently pre-assembled into an armature group or armature block, and the assembled armature blocks are arranged in sequence at predetermined intervals, and a predetermined phase difference is generated between the armature blocks by supplying currents of different phases to the armature blocks to generate a driving force.

[0058] Figure 4 shows a linear motor in which nine armature modules constituting the primary member are arranged in a distributed manner. It shows a motor that uses nine armature modules, each with three salient poles, applying the same principle as the linear motor shown in Figure 1.

[0059] In a motor with a basic unit (S, P) = (9, 8), nine armature modules are arranged in sequence, and a three-phase current can be applied in the order uUuvVvwWw (or UuUVvVWwW). To increase the thrust by improving the symmetric efficiency of the magnetic circuit in a linear motor, a large value is used for the number of armature modules S in the motor's basic unit, and a value close to S is used for the number of permanent magnets P. Multiple basic units can also be linked together and used.

[0060] When numerous armature modules are arranged in a series on a primary component, a large amount of current is supplied to the primary component where the armature modules are densely packed. This can cause deformation of the magnetic core, such as the connecting parts and salient poles, due to heat, leading to a decrease in accuracy and potentially causing cogging.

[0061] To solve problems such as thermal deformation and cogging and to improve accuracy, as shown in Figure 4, multiple armature modules can be distributed and arranged in the primary member, and armature modules supplied with the same or 180-degree phase (or opposite phase) currents can be bundled together and separated from armature modules supplied with a different phase (120-degree phase) currents.

[0062] In Figure 4, for example, armature module groups supplied with uUu phase current (U-phase group, "U group" in the figure), armature module groups supplied with vVv phase current (V-phase group, "V group" in the figure), and armature module groups supplied with wWw phase current (W-phase group, "W group" in the figure) are separated from each other and distributed.

[0063] When armature modules supplied with the same phase current are bundled together and arranged in a continuous armature module group, the coils of the armature modules belonging to that group can be connected in series. In this way, only one pair of wires needs to be connected to the group, which is advantageous for the assembly of primary components and the connection of primary components to the controller.

[0064] Most linear motors other than the linear motors described herein have a structure in which the armature modules constituting the primary member are connected to each other without being separated, so that currents of different phases must flow through adjacent armature modules. Therefore, in linear motors of other structures, it is impossible to arrange armature modules of the same phase consecutively, as shown in Figure 4.

[0065] To assemble multiple armature modules in armature block units, where currents of the same phase flow through the coils of each armature module, it is necessary to fix the armature modules from the first to the last that make up the armature block.

[0066] To achieve this, multiple armature modules can be assembled into a single armature block by forming holes in the magnetic core of the armature module, providing spacers between each armature module, passing a rod through the holes, and fixing the rod to the first and last magnetic cores. Here, by also forming holes in the spacers and passing a rod through them, the spacing between armature modules can be stably maintained.

[0067] Figures 5a to 5c show an armature block in which multiple armature modules, each carrying a current of the same phase through a coil, are assembled into a single block, according to one embodiment of this specification. Figure 5a shows a plan view of the armature module as seen from the direction of travel of the linear motor, Figure 5b shows an example in which a first rod is passed through a first hole formed in multiple armature modules, and Figure 5c shows the assembled armature block with the first rod passed through the first holes formed in multiple armature modules and spacers.

[0068] In Figure 5a, the armature module 10 may consist of a magnetic core (11, 12, 14) and a coil 13. The magnetic core may include a connecting portion 11, two or more salient poles (or protrusions) 12 projecting in one direction from the connecting portion 11, and a second protrusion 14 projecting in the opposite direction to the direction in which the salient poles 12 project.

[0069] Furthermore, multiple holes 15 and 16 can be formed in the magnetic core. This is for passing a rod (or similar) through when assembling an armature block with multiple armature modules 10 and assembling a primary member with multiple armature blocks to fix the armature modules.

[0070] As shown in Figure 5a, one or more first holes 15 and one or more second holes 16 may be formed in the magnetic core.

[0071] The first hole 15 is for inserting the first rod when assembling an armature block with multiple armature modules, and the second hole 16 is for inserting the second rod when assembling a primary member with multiple armature blocks.

[0072] In Figure 5a, the first hole 15 and the second hole 16 are formed in each salient pole 12, and they can also be formed in the connecting portion 11 at each position where the salient pole 12 protrudes (relative to the horizontal direction). Alternatively, the first hole 15 and the second hole 16 formed in the connecting portion 11 can be formed only once in the center, regardless of the number of salient poles 12, or only between salient poles.

[0073] The first hole 15 and the second hole 16 formed in the salient pole 12 can be formed at a position close to the end of the salient pole 12. This is because it is advantageous to form them at a position as far away as possible from the path through which the magnetic flux flowing to the magnet placed between the salient poles 12 passes via the connecting portion 11 and the salient pole 12.

[0074] As shown in Figures 5b and 5c, the armature block 100 can be assembled by inserting the first spacer 31 between the armature modules 10 and using the first rod 33 to pass through the first hole 15 formed in the magnetic coil of the armature module 10 and the hole formed in the first spacer 31.

[0075] Rivets 34 are formed on one or both ends of the first rod 33, and at least one of the first armature module 10 and the last armature module 10 of the armature block 100 can be fixed to the rivets 34 at the ends of the first rod 33.

[0076] Once the assembly is complete with the multiple armature modules 10 fixed at a constant distance from each other by rivets 34 on the first rod 33 that pass through the first spacer 31 and the first hole 15, the coils 13 of the armature modules 10 can be connected in series and pulled out as connecting wiring 113 for the armature block 100.

[0077] Instead of fixing the first rod 33 to the first or last armature module 10 of the armature block 100 with a rivet 24, it can also be fixed by means of adhesive or welding.

[0078] The armature block 100 can be assembled using the same procedure regardless of whether it is U-phase, V-phase, or W-phase. This is because supplying the desired phase power to the connecting wiring 113 will result in armature blocks 100 for U-phase, V-phase, and W-phase.

[0079] Figure 6 shows the armature block connected to the base using a sliding mechanism, Figure 7 shows the armature block connected to the base, the first wall, and the second wall, and Figure 8 shows a plan view of the first wall as seen from the direction of travel of the linear motor, compared with a plan view of the armature module.

[0080] As shown in Figure 6, the second protrusion 14, which protrudes in the opposite direction to the direction in which the salient pole 12 protrudes from the connecting portion 11 of the magnetic core of the armature module 10, can protrude in a manner in which its width increases as it moves away from the connecting portion 11.

[0081] The base 40 to which the armature module 10 is fixed has a groove 41 formed in a shape corresponding to the cross-section of the second projection 14, and the armature module 10 can be stably fixed to the base 40 by sliding the second projection 14 of the armature module 10 into the groove 41 in the direction of motor travel.

[0082] For example, when driving a linear motor with a three-phase power supply, by arranging armature block 100U supplied with U-phase power, armature block 100V supplied with V-phase power, and armature block 100W supplied with W-phase power in a series and inserting a second spacer 32 between the armature blocks, the distance between the armature blocks (corresponding to the phase difference) can be kept constant.

[0083] To correct the spacing between armature blocks to correspond to the phase difference, taking into account the thickness deviation of the iron plates constituting the magnetic core, a second spacer 32 of a desired thickness can be selected and inserted between the armature blocks.

[0084] Furthermore, a hole can be formed in the second spacer 32 so that the second rod 35 can pass through it to fix the armature blocks 100U, 100V, and 100W to each other. The hole formed in the second spacer 32 corresponds to the second hole 16 of the armature module 10.

[0085] Furthermore, the second spacer 32 does not need to have a hole corresponding to the first hole 15 of the armature module 10. Alternatively, a hole or groove corresponding to the first hole 15 of the armature module 10 can be formed in the second spacer 32 to accommodate the thickness change of the armature block 100 that occurs when processing the rivet 34 at the end of the first rod 33 to fix the armature module of the armature block 100, causing it to protrude outwards.

[0086] As shown in Figure 7, a first wall 42 can be formed on the outside of the first and last armature blocks among the at least three armature blocks 100 that constitute the primary member.

[0087] The first wall 42 may have a shape similar to the magnetic core of the armature module 10. That is, it may include a protruding portion that projects upward to correspond to the salient poles 12 of the armature module 10 and a connecting portion that connects the protruding portion. Therefore, since there is space between the protruding portions, collision with the relatively moving permanent magnet module 20 can be prevented.

[0088] A third hole 43 is formed in the first wall 41 at a position corresponding to the second hole 16 formed in the armature module 10, through which the second rod 35 can pass.

[0089] By forming a threaded portion on at least one of the two ends of the second rod 35 and fastening a nut 36 to the threaded portion, the two first walls 41 and three or more armature blocks 100 can be fixed together. Alternatively, the first walls 42 and armature blocks 100 can be fixed together using other known fastening means instead of the threaded portion and nut.

[0090] It is not necessary to form a hole in the first wall 42 that corresponds to the first hole 15 of the armature module 10, or when assembling the armature block 100 by forming a hole or groove that corresponds to the first hole 15 of the armature module 10, the protrusion of the rivet 34 at the end of the first rod 33 may be accommodated.

[0091] A fourth hole 44 can be formed in the first wall 42 to allow connecting wires 113U, 113V, and 113W drawn out from the armature block 100 to pass through. The fourth hole 44 can be formed in the connecting portion of the first wall 42, outside the outermost protruding portion.

[0092] The height of the highest part of the connecting portion that connects the protruding portions in the first wall 42 (height from the bottom surface of the base 40) can be made higher than the uppermost end of the connecting portion 11 of the armature module 10, and in particular, it can be made greater than the height of the uppermost end of the coil 13 wound around the salient pole 12 of the armature module 10 (h in Figure 8), so that both the connecting portion 11 and the coil 13 of the armature module 10 are not exposed to the outside.

[0093] Furthermore, as shown in Figure 7, two second walls 45 can be formed parallel to the direction of travel of the linear motor. The second walls 45 can be formed in the form of a rectangular flat plate from the top surface of the base 40 up to the height of the connecting portion of the first wall 42, so that the coils 13 of the armature module 10 are not exposed to the outside.

[0094] The base 40, the connecting portion of the two first walls 42, and the space formed by the two second walls 45 can be molded by injecting a resin such as epoxy. This molding process is intended to fix the coil 13 in place so that it cannot move, and prevents the coil 13 from breaking due to vibrations generated when the linear motor is operating.

[0095] Figure 9 shows the primary component of a linear motor, where the armature block is composed of five armature modules, each consisting of two salient poles.

[0096] In a motor with a basic unit (S, P) = (15, 14) or (15, 16), five armature modules, each with two salient poles, are pre-assembled into a single armature block. The U-phase, V-phase, and W-phase armature blocks are then arranged continuously with a second spacer inserted between them to form a primary member, which can then be connected to the base, first wall, and second wall. A detailed explanation of this is the same as that given with reference to Figures 5 to 8, so it will be omitted here.

[0097] In this way, multiple armature modules of the same phase are pre-assembled into a single armature block. Here, a rod is passed through the armature modules, and the ends of the rods are treated with rivets, welds, or adhesives to fix the multiple armature modules in place. By sequentially connecting the coils of the multiple armature modules, the work of connecting the coils of armature modules of the same phase one by one after assembling the primary components is reduced, thereby improving assembly efficiency.

[0098] Furthermore, it eliminates the hassle of having to adjust the thickness of all spacers between armature modules to match the phase difference between them. By only adjusting the spacing between armature blocks with the second spacer, accuracy can be improved with less work.

[0099] Furthermore, by molding the coils wound around the armature module, the risk of coil breakage is reduced, extending the lifespan of the linear motor.

[0100] From the above explanation, it will be clear to those skilled in the art that various changes and modifications are possible without departing from the technical concept of the present invention. Therefore, the technical scope of the present invention is not limited to the contents described in the detailed description of the specification, but must be determined by the claims. [Prior art documents] [Patent Documents]

[0101] [Patent Document 1] Special Publication No. 2014-504129 [Patent Document 2] Korean Patent Publication No. 10-2012-0068356

Claims

1. A primary component including multiple armature modules, A secondary member comprising a permanent magnet module containing multiple permanent magnets arranged so that their poles alternate in the direction of travel, Each of the armature modules includes a magnetic core with two or more protrusions, and a coil wound around the magnetic core through which currents of the same phase flow. P permanent magnets and S armature modules are considered as one unit, and a power supply having a predetermined phase difference is applied to the coil of each armature module so as to generate thrust. With the permanent magnet module positioned between the two protrusions of the armature module, one of the primary member or the secondary member becomes the moving element and the other becomes the stator, and they move relative to each other by the thrust generated. The plurality of armature modules include three or more armature blocks in which two or more armature modules, each having a current of the same phase flowing through its coil, are adjacent to each other in the direction of travel. In each of the armature blocks, a first rod passes through one or more first holes formed in the magnetic core of each armature module, and both ends of the first rod are fixed to the armature modules located at both ends of the armature block. The three or more armature blocks are joined together by having a second rod pass through one or more second holes formed in the magnetic core of each armature module, and by fixing at least one of the two ends of the second rod with fastening means. The armature block is further provided with a base for fixing it, The base includes two first walls erected parallel to the armature module and two second walls erected side by side along the direction of travel. The first wall communicates with the second hole of the magnetic core and includes a third hole through which the second rod passes. A linear motor characterized in that the two first walls and the three or more armature blocks are coupled to each other by fastening a nut to a threaded portion formed on at least one end of the second rod.

2. The linear motor according to claim 1, characterized in that at least one end of the first rod is formed as a rivet and joined to the armature module.

3. The magnetic core of the armature module includes a second projection that protrudes in the direction opposite to the direction in which the projection protrudes. The linear motor according to claim 1, characterized in that the armature block is fixed to the base by the second protrusion of the armature module and the groove formed in the base being connected in a sliding manner.

4. The coil is wound around the protrusion closer to the connecting portion that connects the protrusion than to the end of the protrusion, The linear motor according to claim 1, characterized in that the first wall and the second wall are erected from the bottom of the base to a first height or greater that can block the coil, and are molded with resin from the bottom of the base to the first height.

5. The linear motor according to claim 4, characterized in that a fourth hole for pulling out the coil is formed in one of the two first walls at a position lower than the first height.

6. A first spacer is inserted between the two armature modules, The linear motor according to claim 1, further comprising a second spacer inserted between two armature blocks.

7. The linear motor according to claim 1, characterized in that the first hole and the second hole are formed in each protrusion of the magnetic core and in the connecting portion connecting the protrusions.

8. The linear motor according to claim 7, characterized in that the first hole and the second hole of the protrusion are formed closer to the end of the protrusion than the connecting portion.

9. The linear motor according to claim 7, characterized in that the first hole and the second hole of the connecting portion are formed at positions corresponding to each of the protruding portions, or only one is formed in the center of the connecting portion.

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