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 a thrust force between a mover and a stator facing each other linearly. A permanent magnet type linear motor generates a thrust force 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 to generate a thrust force. 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 sealed type and an 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 with respect to the traveling direction, spacers must be inserted between each of the armature modules, and the coils of the armature modules to which current of the same phase is supplied must be connected to each other.

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

[0007] In addition, in the armature module, the magnetic core around which the coil is wound is formed by laminating ferromagnetic iron plates. However, since the thickness of the iron plates supplied by the steel company is not constant, the thickness of the magnetic core formed by laminating a large number of iron plates is not constant.

[0008] If the thickness of each armature module is not constant, the intervals between the armature modules will be different. This means that the phase difference between the armature modules deviates from the phase difference of the supplied current.

[0009] In order to make the phase difference between the armature modules constant, the physical intervals between the armature modules must be adjusted. For this purpose, the thickness of each armature module must be measured, and accordingly, the thickness of the spacer must also be adjusted.

[0010] In this way, a great deal of time and cost are incurred in the assembly of the primary member, and it may be difficult to improve the assembly accuracy.

Summary of the Invention

Problems to be Solved by the Invention

[0011] This specification is made in view of such a situation, and the object of this specification is to improve the assemblability of the primary member composed of armature modules in a linear motor in which a plurality of armature modules are arranged in a row in the advancing direction.

[0012] Another object of this specification is to provide a linear motor that reduces the risk of coil disconnection.

Means for Solving the Problems

[0013] The linear motor according to an embodiment of the present specification 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 poles alternating 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 currents of the same phase flow. 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 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 currents of the same phase flow 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.

Advantages of the Invention

[0014] Therefore, since it is possible to pre-assemble in units of armature blocks in which a plurality of armature modules supplied with currents of the same phase are bundled, after assembling the primary member, the work of connecting the coils of the armature modules of the same phase one by one can be reduced, process automation becomes possible, and the assembly workability is improved.

[0015] In addition, by performing a molding process on the coil wound around the magnetic core of the armature module, when operating at high speed, the risk of disconnection of the coil that may be caused by vibration can be reduced, the failure factors of the linear motor can be reduced, the performance can be stably maintained, and the lifespan can be extended.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5a

Figure 5b

Figure 5c

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0017] The various embodiments of the linear motor in this specification can be 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 poles alternating 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 at least 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 protrusion protruding in a direction opposite to the direction in which the protrusion protrudes, and the second protrusion of the armature module and the groove formed in the base are coupled in a sliding manner, whereby the armature block can be fixed to the base.

[0023] In one embodiment, the base includes two first walls erected parallel to the armature module and two second walls erected side by side along the traveling direction. The first wall communicates with the second hole of the magnetic core and includes a third hole through which the second bar penetrates. By fastening a nut to the screw portion formed at at least one end of the second bar, the two first walls and three or more armature blocks can be coupled to each other.

[0024] In one embodiment, the coil is wound around the protrusion close to the connecting portion connecting the protrusions rather than the end of the protrusion, and the first wall and the second wall are erected from the bottom of the base to a height of at least the first height that can block 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 drawing out the coil can be formed at a position lower than the first height on one of the two first walls.

[0026] In one embodiment, the linear motor can 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 hole and the second hole can be formed in each protrusion of the magnetic core and the connecting portion connecting the protrusions.

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

[0029] In one embodiment, the first hole and the second hole of the connecting portion can be formed at positions corresponding to each protrusion respectively or only one can be formed at the center of the connecting portion. BEST MODE FOR CARRYING OUT THE INVENTION

[0030] Hereinafter, preferred embodiments of the linear motor according to the present specification will be described in detail with reference to the accompanying drawings.

[0031] Among the linear motors described in Korean Patent Application Nos. 10-2010-0081522 and 10-2010-0129947, in the open-type linear motor as shown in FIG. 1, the connecting portion 11 of the magnetic core of the armature module 10 is not C-shaped for surrounding the permanent magnet module 20 which is a secondary member, but is, for example, linear, and a plurality of salient poles 12 which are part of the magnetic core protrude from the connecting portion 11 in the same direction, for example, at right angles, and a plurality of permanent magnet modules 20 which are secondary members also have a form protruding toward the connecting portion 11 between the salient poles 12 arranged side by side. When the coil 13 is wound around each salient pole 12, it can be wound at a position closer to the connecting portion 11 than the end of the salient pole 12 (a position not reached by the permanent magnet 21 protruding toward the connecting portion 11) or wound around the connecting portion 11 between two salient poles 12.

[0032] In other linear motors described in Korean Patent Application Nos. 10-2010-0081522 and 10-2010-0129947, since the protruding angles of the salient poles 12 with respect to the connecting portion 11 of the armature module 10 are different from each other, the production of the mold is costly and there is a limit to improving the accuracy. However, in the linear motor of FIG. 1, in each armature module 10, all the salient poles 12 form the same angle as the connecting portion 11, for example, a right angle, and each permanent magnet module 20 is also fixed in a state of forming the same angle as the permanent magnet base 22, for example, a right angle, so that the manufacturing accuracy can be improved and the mold manufacturing cost can also be reduced.

[0033] The linear motor according to the present specification is obtained by modifying the open-type linear motor of FIG. 1 into a permanent magnet movable type in the linear motors described in Korean Patent Application Nos. 10-2010-0081522 and 10-2010-0129947.

[0034] FIG. 2 shows a linear motor described in Korean Patent Application No. 10-2011-0020599 invented by the inventor of the present specification, and may include 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. Compared with the linear motor of FIG. 1, the operating principle is the same except that the number of salient poles 12 and the number of permanent magnet modules 20 are reduced to 2 and 1, respectively.

[0035] FIG. 3 is a diagram showing the operating principle of the linear motors of FIGS. 1 and 2, in which a thrust in the linear direction is generated by a combination of a primary member composed of three armature modules and a plurality of permanent magnets, and shows the principle that a thrust is generated in the traveling direction by a combination of two or more armature modules and a permanent magnet module. For example, when two permanent magnets N and S are corresponded to three armature modules 10U, 10V, and 10W, it becomes a combination of a three-phase armature module and a two-pole permanent magnet as shown in the upper diagram of FIG. 3.

[0036] In FIG. 3, U, V, and W are the salient poles 12 on one side of each of the three armature modules 10U, 10V, and 10W of FIGS. 1 and 2 arranged in the traveling direction, and S / N is the arrangement of the permanent magnets 21 arranged at positions corresponding to the 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 having a phase difference of 120 degrees with respect to an adjacent module can be applied to the coil 13 of each armature module 10.

[0038] Also, as shown in the upper diagram of FIG. 3, if the interval between the poles of the permanent magnets S or N alternately arranged in the traveling direction is τ (1 / 2 cycle, 180 degrees), the three armature modules 10 can be arranged at an interval corresponding to 2 / 3τ (120 degrees).

[0039] When an alternating current with a peak value (P) in the (+) direction is passed through the coil wound around the salient pole V located between the S pole and the N pole of the permanent magnet, when the salient pole V becomes the N pole, an alternating current with a magnitude of peak value (P) / square root (2) in the (-) direction is passed through the coils wound around the salient poles U and W, so that the salient poles U and W become the S poles. Therefore, the salient pole V, which is the N pole, exerts an attractive force on the permanent magnet S pole and a repulsive force on the permanent magnet N pole to move the permanent magnet to the right. The salient poles U and W, which have become the S poles due to magnetic forces smaller than that of the N pole of the salient pole V, exert repulsive and attractive forces on the permanent magnet S pole and the permanent magnet N pole respectively, but they cancel each other out and do not affect the direction of progress.

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

[0041] By repeating such a process, the permanent magnet 21 comes to move to the right. That is, the three-phase current applied to each armature module 10 generates a rotating magnetic field in the salient poles U, V, and W, and thus a thrust force to move to the right is generated on the permanent magnet 21.

[0042] In the case of an ideal model, the thrust force for moving the permanent magnet 21 is proportional to the sum of the surface areas where the salient pole 12 and the permanent magnet 21 are in contact, and also increases in proportion to the number of armature modules 10 arranged in the direction of progress. It also has a proportional relationship with the magnitude of the current applied to the coil 13, the number of turns the coil 13 is wound around the salient pole 12, and the magnitude of the magnetic force of the permanent magnet 21.

[0043] The first example (upper view) of FIG. 3 is an example for the basic combination of a three-phase armature module and a two-pole permanent magnet, and the second example (lower view) of FIG. 3 is an example for the combination of a three-phase armature module and a four-pole permanent magnet, which is an extension of the basic combination. The principle of thrust generation is the same, and combinations such as three-phase eight-pole and ten-pole are also possible.

[0044] Generally speaking, thrust is generated based on the combination of the number S of armature modules 10 that is a multiple of the motor constant and the number P of permanent magnets 21 that is a multiple of 2 (N pole and S pole). Here, the motor constant is 3 when driving the armature with a three-phase power supply and 5 when driving with a five-phase power supply. Generally, it is an odd number of 3 or more. The phase difference of the current applied to the coil 13 of each armature module 10 is determined by the motor constant.

[0045] Of course, if the length (length in the moving direction) of the portion where S armature modules and P permanent magnets face each other with a gap in between is defined as the unit length of the primary member, 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, it is possible to ensure an effective distance for generating the thrust to move the mover.

[0046] That is, when the length where the primary member and the secondary member overlap is configured to be longer than the unit length (the number of armature modules is S or more or the number of permanent magnets is P or more), an effective distance for thrust generation is ensured, and the thrust can increase in proportion to the area where the primary member and the secondary member face each other.

[0047] Apply three-phase currents to each armature module 10 of the primary member in the order of UuU (or uUu) (U-phase group), VvV (or vVv) (V-phase group), WwW (or wWw) (W-phase group) in the traveling direction. Here, the lowercase letters mean that currents with phases opposite to the uppercase letters are supplied.

[0048] Here, the meaning of supplying currents with opposite phases means either supplying different currents with a 180-degree phase difference to the coils wound around other salient poles respectively, or it can mean supplying currents with the same phase to the coils but winding the coils around the salient poles in different directions. However, from the perspective of driving the motor, while supplying current through a single line, two currents with a 180-degree phase difference are supplied simultaneously, so the latter is much more advantageous.

[0049] Since the primary members are not connected to each other and are composed of independent armature modules 10, when the same magnitude of power supply is provided to each armature module 10, the same magnitude of independent magnetic flux will flow through each armature module 10, reducing the deviation of the thrust generated through each armature module 10 and reducing the ripple in the thrust.

[0050] The amount of magnetic flux passing through the salient pole 12 and the permanent magnet 21 is proportional to the area of the portion where the salient pole 12 and the permanent magnet 21 face each other when the distribution of the magnetic flux exiting from or entering the salient pole 12 is constant.

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

[0052] On the other hand, most other linear motors that are not the linear motor described in this specification have a structure in which the armature modules constituting the primary member are connected without being separated from each other. However, since the armature modules of the linear motor described in this specification are separated from each other, in order to maintain a predetermined phase difference with respect to adjacent armature modules, the interval between the armature modules must be maintained, and for this purpose, a spacer is inserted between the two armature modules.

[0053] Holes are formed in the salient poles and connecting parts of the magnetic core constituting the armature module, a spacer with holes formed therein is arranged between two armature modules, and a plurality of armature modules can be sequentially assembled by inserting a bar (or rod) into the holes of the magnetic core and the spacer. After passing a bar through all the armature modules constituting the primary member, the assembly of the armature modules can be completed by fixing both sides of the bar with fastening means, such as nuts.

[0054] After arranging the armature modules sequentially, there is the trouble that the coils of the armature modules in the same phase have to be connected in series one by one.

[0055] Also, when forming a magnetic core by laminating a large number of iron plates, there is a problem that the thickness of the iron plates is not constant and the thickness of the magnetic core, that is, the armature module, changes, and as a result, the phase difference with respect to adjacent armature modules changes.

[0056] In a linear motor with low accuracy, such a difference does not cause a big problem, but when high accuracy is required, the distance between adjacent armature modules has to be accurately adjusted. For this purpose, it is not easy to simplify the process of assembling the primary member because the thickness of each magnetic module has to be measured and the thickness of the spacer has to be adjusted according to the measured value.

[0057] In consideration of such problems, first, a linear motor according to an embodiment of the present specification continuously arranges two or more armature modules in the same phase and independently pre-assembles them into one armature group or armature block, and arranges the assembled plurality of armature blocks continuously at a predetermined interval, and supplies currents with different phases to the armature blocks so that a predetermined phase difference that can generate a driving force between the armature blocks can be generated.

[0058] FIG. 4 shows a linear motor in which nine armature modules constituting a primary member are arranged in a dispersed manner, and shows a motor that applies the same principle as the linear motor shown in FIG. 1 and uses nine armature modules each having three salient poles.

[0059] In a motor with a basic unit (S, P) = (9, 8), nine armature modules are arranged continuously, and three-phase currents can be applied in the order of uUuvVvwWw (or UuUVvVWwW). In order to increase the thrust by enhancing the symmetry efficiency of the magnetic circuit in the linear motor, a large value is used for the number S of armature modules in the basic unit of the motor, a value close to S is used for the number P of permanent magnets, and a plurality of basic units can be connected and used.

[0060] When a large number of armature modules are continuously arranged in the primary member, a large amount of current is supplied to the primary member where the armature modules are concentrated, and deformation may occur in the connecting part and salient poles that are magnetic cores due to heat, resulting in a decrease in accuracy and possibly causing cogging.

[0061] In order to solve problems such as deformation due to heat and cogging and improve the accuracy, as shown in FIG. 4, a plurality of armature modules can be arranged in a dispersed manner in the primary member, and armature modules supplied with currents of the same or 180-degree phase (or opposite phases) can be bundled together and separated from armature modules supplied with currents of different phases (120-degree phase).

[0062] In FIG. 4, for example, a group of armature modules supplied with a current of uUu phase (U-phase group, "U group" in the figure), a group of armature modules supplied with a current of vVv phase (V-phase group, "V group" in the figure), and a group of armature modules supplied with a current of wWw phase (W-phase group, "W group" in the figure) are separated from each other and arranged in a dispersed manner.

[0063] When the armature modules supplied with currents of the same phase are bundled together and continuously arranged as an armature module group, the coils of the armature modules belonging to the group can be connected in series with each other. In this way, only a pair of wirings need to be connected to the group, which is advantageous for the assembly of the primary member and the connection between the primary member and the controller.

[0064] Most other linear motors that are not the linear motor of the present specification have a structure in which the armature modules constituting the primary member are connected without being separated from each other. Therefore, currents of different phases must flow through adjacent armature modules. Thus, other-structured linear motors cannot continuously arrange armature modules of the same phase as shown in FIG. 4.

[0065] In order to assemble a plurality of armature modules in units of armature blocks in which currents of the same phase flow through the coils of each armature module, it is necessary to fix the armature blocks from the first armature module to the last armature module constituting the armature block.

[0066] For this purpose, holes are formed in the magnetic cores of the armature modules, spacers are provided between each armature module, a rod is passed through the holes, and the rod is fixed to the first magnetic core and the last magnetic core, whereby a plurality of armature modules can be assembled into a single armature block. Here, holes are also formed in the spacers, and by passing the rod through them, the distance between the armature modules can be stably maintained.

[0067] FIGS. 5A to 5C show an armature block in which a plurality of armature modules through which currents of the same phase flow through the coils are assembled into a single block according to an embodiment of the present specification. FIG. 5A shows a plan view of the armature module as viewed from the traveling direction of the linear motor, FIG. 5B shows an example in which a first rod penetrates through first holes formed in a plurality of armature modules, and FIG. 5C shows a state in which the first rod penetrates through first holes formed in a plurality of armature modules and spacers to assemble the armature block.

[0068] In Fig. 5a, the armature module 10 can be composed of a magnetic core (11, 12, 14) and a coil 13. The magnetic core can include a connecting portion 11, two or more salient poles (or protruding portions) 12 protruding in one direction from the connecting portion 11, and a second protruding portion 14 protruding in a direction opposite to the direction in which the salient poles 12 protrude.

[0069] Moreover, a plurality of holes 15, 16 can be formed in the magnetic core. This is for passing a rod (or rod) for fixing the armature module when assembling an armature block with a plurality of armature modules and assembling a primary member with a plurality of armature blocks.

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

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

[0072] In Fig. 5a, the first hole 15 and the second hole 16 can be formed in each salient pole 12, and also in the connecting portion 11, at each position where the salient poles 12 protrude (with the horizontal direction as a reference). Alternatively, only one first hole 15 and one second hole 16 can be formed in the center of the connecting portion 11 regardless of the number of salient poles 12, or only between the 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 at a position where the magnetic flux flowing through the magnet disposed between the salient poles via the connecting portion 11 and the salient poles 12 is separated from the passing path.

[0074] As shown in FIGS. 5b and 5c, a first spacer 31 is inserted between the armature modules 10, and the armature block 100 can be assembled by passing a first bar 33 through a first hole 15 formed in the magnetic body coil of the armature module 10 and a hole formed in the first spacer 31.

[0075] Rivets 34 are formed at one or both side ends of the first bar 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 rivet 34 at the end of the first bar 33.

[0076] When the assembly of the plurality of armature modules 10 is completed with a constant interval fixed by the rivets 34 of the first bar 33 passing through the first spacer 31 and the first hole 15, the coils 13 of the armature modules 10 can be connected in series and drawn out as the connection wiring 113 of the armature block 100.

[0077] Instead of fixing the first bar 33 to the first armature module 10 or the last armature module 10 of the armature block 100 with rivets 24, it can also be fixed by methods such as adhesives or welding.

[0078] The assembly of the armature block 100 can be assembled by the same operation without distinguishing between the U-phase, V-phase, and W-phase. This is because if a power supply of a desired phase is supplied to the connection wiring 113, the armature blocks 100 of the U-phase, V-phase, and W-phase are obtained.

[0079] FIG. 6 is a diagram showing a state in which the armature block is coupled to the base in a sliding manner, FIG. 7 is a diagram showing a state in which the armature block is coupled to the base, the first wall, and the second wall, and FIG. 8 is a diagram showing a comparison of a plan view of the first wall viewed from the traveling direction of the linear motor with a plan view of the armature module.

[0080] As shown in FIG. 6, the second protruding portion 14 protruding in a direction opposite 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 form in which the width increases as it proceeds in a direction away from the connecting portion 11.

[0081] In the base 40 to which the armature module 10 is fixed, a groove portion 41 having a form corresponding to the cross section of the second protruding portion 14 is formed, and the second protruding portion 14 of the armature module 10 is inserted into the groove portion 41 in a sliding manner in the advancing direction of the motor, so that the armature module 10 can be stably fixed to the base 40.

[0082] For example, when driving a linear motor with a three-phase power supply, the armature blocks 100U supplied with the U-phase power supply, the armature block 100V supplied with the V-phase power supply, and the armature block 100W supplied with the W-phase power supply are continuously arranged, and the second spacer 32 is inserted between the armature blocks, whereby the distance between the armature blocks (corresponding to the phase difference) can be kept constant.

[0083] In consideration of the thickness deviation of the iron plate constituting the magnetic core, in order to correct the interval between the armature blocks so as to correspond to the phase difference, a second spacer 32 having a desired thickness can be selected and inserted between the armature blocks.

[0084] Further, holes can be formed in the second spacer 32 so that the second rod 35 passes through and the armature blocks 100U, 100V, 100W and the second spacer 32 are fixed to each other. The holes formed in the second spacer 32 are holes corresponding to the second holes 16 of the armature module 10.

[0085] Further, it is not necessary to form holes corresponding to the first holes 15 of the armature module 10 in the second spacer 32. Alternatively, when processing the rivet 34 at the end of the first rod 33 to form holes or grooves corresponding to the first holes 15 of the armature module 10 in the second spacer 32 to fix the armature module of the armature block 100, the thickness change of the armature block 100 protruding to the outside can also be accommodated.

[0086] As shown in FIG. 7, a first wall 42 can be formed outside the first and the last armature blocks among at least three or more armature blocks 100 constituting the primary member.

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

[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, and the second rod 35 can penetrate this.

[0089] By forming a screw portion at at least one of both side ends of the second rod 35 and fastening a nut 36 to the screw portion, two first walls 41 and three or more armature blocks 100 can be fixed. Instead of the screw portion and the nut, other known fastening means can also be used to fix the first wall 42 and the armature block 100.

[0090] The first wall 42 may not form a hole corresponding to the first hole 15 of the armature module 10, or when forming a hole or groove corresponding to the first hole 15 of the armature module 10 to assemble the armature block 100, 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 so that the connection wirings 113U, 113V, and 113W drawn out from the armature block 100 pass through. The fourth hole 44 can be formed outside the outermost protruding portion in the connecting portion of the first wall 42.

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

[0093] Also, as shown in FIG. 7, two second walls 45 can be formed parallel to the traveling direction of the linear motor. The second wall 45 is formed in the form of a rectangular flat plate from the upper surface of the base 40 to the height of the connecting portion of the first wall 42, so that the coil 13 of the armature module 10 is not exposed to the outside.

[0094] Resin such as epoxy can be injected and molded into the space formed by the base 40, the connecting portions of the two first walls 42, and the two second walls 45. Such a molding process is for fixing the coil 13 so that it cannot move, and can prevent the coil 13 from being disconnected due to vibrations generated when the linear motor operates.

[0095] FIG. 9 is a diagram showing a primary member of a linear motor in which an armature block is composed of five armature modules each composed of two salient poles.

[0096] For a motor with a basic unit (S, P) = (15, 14) or (15, 16) and two salient poles, five armature modules are pre-assembled into a single armature block, and the U-phase, V-phase, and W-phase armature blocks are continuously arranged with a second spacer inserted therebetween to form a primary member, which can be combined with the base, the first wall, and the second wall. Since the specific description thereof is the same as that described with reference to FIGS. 5 to 8, it is omitted here.

[0097] In this way, a plurality of armature modules having 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 rod are processed with rivets, welding, or adhesives to fix the plurality of armature modules, and the coils of the plurality of armature modules are sequentially connected. After assembling the primary member, the work of connecting the coils of the armature modules having the same phase one by one is reduced, and the assembly workability is improved.

[0098] Also, the trouble of adjusting the thickness of all the spacers between the armature modules to match the phase difference between the armature modules is eliminated, and only the interval between the armature blocks needs to be adjusted with the second spacer, so the accuracy can be improved with a small amount of work.

[0099] Also, by performing a molding process on the coil wound around the armature module, the risk of the coil being disconnected can be reduced, and the life of the linear motor can be extended.

[0100] From the above-described content, it can be understood that those skilled in the art can make various changes and modifications without departing from the technical idea of the present invention. Therefore, the technical scope of the present invention is not limited to the content described in the detailed description of the specification, but must be determined by the scope of the claims.

Prior Art Documents

Patent Documents

[0101]

Patent Document 1

Patent Document 2

Claims

1. A primary member including a plurality of armature modules; A secondary member having a permanent magnet module including a plurality of permanent magnets arranged with poles alternating in the advancing direction, and comprising: Each of the armature modules includes a magnetic core including two or more protruding portions, and a coil wound around the magnetic core through which currents of the same phase flow; Taking P of the permanent magnets and S of the armature modules as one unit, a power source having a predetermined phase difference is applied to the coils of the respective armature modules so that thrust is generated; With the permanent magnet module disposed between the two protruding portions of the armature module, either one of 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 of the armature modules through which currents of the same phase flow are adjacent to each other in the advancing direction; In each of the armature blocks, 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 the three or more armature blocks are coupled. A linear motor characterized by that.

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

3. The linear motor according to claim 1, wherein the three or more armature blocks are coupled by fastening a nut to a threaded portion formed at at least one side end of the second rod.

4. The linear motor according to claim 1, further comprising a base for fixing the armature block.

5. The magnetic core of the armature module includes a second protruding portion protruding in a direction opposite to the direction in which the protruding portion protrudes; The linear motor according to claim 4, wherein the second protruding portion of the armature module and a groove portion formed in the base are coupled in a sliding manner, whereby the armature block is fixed to the base.

6. The base includes two first walls erected parallel to the armature module and two second walls erected side by side along the traveling direction, the first wall includes a third hole that communicates with the second hole of the magnetic core and through which the second rod penetrates, The linear motor according to claim 4, wherein the two first walls and the three or more armature blocks are coupled to each other by fastening a nut to a screw portion formed at at least one side end of the second rod.

7. The coil is wound around the protruding portion closer to a connecting portion connecting the protruding portions than to the end of the protruding portion, The first wall and the second wall are erected from the bottom of the base to a first height or more that can block the coil, and are molded with resin from the bottom of the base to the first height, and the linear motor according to claim 6 is characterized in that.

8. The linear motor according to claim 7, wherein a fourth hole for drawing out the coil is formed at a position lower than the first height in one of the two first walls.

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

10. The linear motor according to claim 1, wherein the first hole and the second hole are formed in each protruding portion of the magnetic core and a connecting portion connecting the protruding portions.

11. The linear motor according to claim 10, wherein the first hole and the second hole of the protruding portion are formed closer to the end of the protruding portion than to the connecting portion.

12. The linear motor according to claim 10, wherein the first hole and the second hole of the connecting portion are respectively formed at positions corresponding to the respective protruding portions, or only one is formed at the center of the connecting portion.

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