Coil device and linear motor

Abstract

To obtain a coil device capable of suppressing occurrence of winding collapse of a conductive wire wound around a cylindrical part of a bobbin.SOLUTION: The coil device 2 includes the bobbin 21 and the coil 22 formed by winding the conducting wire 3 around the bobbin 21, the bobbin 21 includes the cylinder-part side 21a around which the conducting wire 3 is wound, the flange-part side 21a provided at the end of the cylinder-part side 21b in the axial direction, and the stopper side 21c, and the first half portion of the first row of the first stage of the conducting wire 3 wound around the cylinder-part side 21a is disposed so as to be in contact with the flange-part side 21b. The stopper 21c restricts the latter half of the first row of the first layer of the conductive wire 3 wound around the 21a of the cylinder part from moving in a direction approaching the 21b of the flange part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a coil device and a linear motor. [Background technology]

[0002] Conventionally, a coil device including a bobbin and a coil has been known. The coil is formed by winding a conductor around the bobbin. The bobbin has a cylindrical portion around which the conductor of the coil is wound and a flange portion provided at the axial end of the cylindrical portion (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2009 / 025162 Summary of the Invention [Problem to be solved by the invention]

[0004] The first half of the first row of the first stage of the conductor wire of the coil is positioned so as to contact the flange. The second half of the first row of the first stage of the conductor wire is away from the flange and toward the first half of the second row of the first stage of the conductor wire. However, in the configuration of the coil device described in Patent Document 1, a space is formed between the second half of the first row of the first stage of the conductor wire and the flange. Therefore, when the second stage of the conductor wire is wound around the outer periphery of the second half of the first row of the first stage of the conductor wire, the second half of the first row of the first stage of the conductor wire may be pushed toward the flange. If the second stage of the conductor wire pushes the second half of the first row of the first stage of the conductor wire toward the flange, there is a problem in that the conductor wire may become unwound.

[0005] The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a coil device and a linear motor that can suppress the occurrence of collapse of the conductor wire wound around the cylindrical portion of the bobbin. [Means for solving the problem]

[0006] The coil device of the present invention comprises a bobbin and a coil formed by winding a conducting wire around the bobbin, the bobbin having a tubular portion around which the conducting wire is wound, a flange portion provided at the axial end of the tubular portion, and a stopper, wherein the front half of the first row of the first stage of the conducting wire wound around the tubular portion is positioned so as to contact the flange portion, and the stopper restricts the rear half of the first row of the first stage of the conducting wire wound around the tubular portion from moving in a direction approaching the flange portion. In the coil device according to the present invention, the height dimension of the stopper from the cylindrical portion is the same as the diameter dimension of the conductor wire. In the coil device of the present invention, the stopper protrudes from the flange portion toward the rear half of the first row of the first stage, and the protruding dimension of the stopper continuously increases as it approaches the front half of the first row of the first stage. In the coil device according to the present invention, the maximum value of the protruding dimension of the stopper is equal to the diameter of the conductor wire. In the coil device according to the present invention, the conductor wire is made of aluminum. In the coil device according to the present invention, the cross section of the conductor perpendicular to the longitudinal direction has a circular shape. The linear motor of this invention comprises a coil device, a coil device support member that slidably supports the coil device, a permanent magnet arranged opposite the coil device, and a permanent magnet support member that supports the permanent magnet, and when current is supplied to the coil, the coil device moves relative to the permanent magnet. [Effects of the Invention]

[0007] According to the coil device and linear motor of the present invention, it is possible to prevent the conductor wire wound around the cylindrical portion of the bobbin from becoming unwound. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a linear motor according to a first embodiment. [Figure 2] FIG. 2 is a vertical cross-sectional view showing the linear motor of FIG. [Figure 3] 2 is a perspective view showing a state in which the conductor wire in the coil device of FIG. 1 has started to be wound around the bobbin. [Figure 4] FIG. 4 is a plan view showing the coil device of FIG. 3. [Figure 5] FIG. 4 is a bottom view showing the coil device of FIG. 3. [Figure 6] FIG. 4 is a longitudinal sectional view showing a main part of the coil device of FIG. 3. [Figure 7] FIG. 10 is a perspective view showing a state in which the winding of the conductor wire around the bobbin has begun in the coil device of the comparative example. [Figure 8] FIG. 8 is a plan view showing the coil device of FIG. 7. [Figure 9] FIG. 8 is a bottom view showing the coil device of FIG. 7. [Figure 10] FIG. 8 is a longitudinal sectional view showing a main part of the coil device of FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0009] Embodiment 1 Fig. 1 is a perspective view showing a linear motor according to embodiment 1. Fig. 2 is a vertical cross-sectional view showing the linear motor of Fig. 1. The linear motor according to embodiment 1 includes a stator 1 and a coil device 2 which is a mover.

[0010] The stator 1 includes a back yoke 11, a plurality of permanent magnets 12, a center yoke 13, a back yoke 14, a plurality of permanent magnets 15, and a connecting member 16.

[0011] The back yoke 11 has a long plate-like shape. One of a pair of surfaces of the back yoke 11 facing in the plate thickness direction is referred to as a first surface 11a, and the other surface is referred to as a second surface 11b.

[0012] A plurality of permanent magnets 12 are provided on the first surface 11a of the back yoke 11. The plurality of permanent magnets 12 are arranged in a row in the longitudinal direction of the back yoke 11. Each permanent magnet 12 is fixed to the first surface 11a of the back yoke 11 via an adhesive (not shown).

[0013] The back yoke 11 is a permanent magnet supporting member that supports the permanent magnets 12 .

[0014] Center yoke 13 has a long plate shape. Center yoke 13 is arranged so that the thickness direction of back yoke 11 and the thickness direction of center yoke 13 coincide with each other. Center yoke 13 is also arranged so that the longitudinal direction of back yoke 11 and the longitudinal direction of center yoke 13 coincide with each other. Center yoke 13 is also arranged so as to face first surface 11a of back yoke 11. A plurality of permanent magnets 12 are arranged between back yoke 11 and center yoke 13.

[0015] The center yoke 13 is a coil device support member that supports the coil device 2 so that the coil device 2 can slide.

[0016] Back yoke 14 has a long plate shape. Back yoke 14 is disposed so that the thickness direction of back yoke 11 and the thickness direction of back yoke 14 coincide with each other. Back yoke 14 is disposed so that the longitudinal direction of back yoke 11 and the longitudinal direction of back yoke 14 coincide with each other. Back yoke 14 is disposed so as to face first surface 11a of back yoke 11.

[0017] One of a pair of surfaces of back yoke 14 facing in the plate thickness direction is referred to as first surface 14a, and the other surface is referred to as second surface 14b. First surface 14a of back yoke 14 faces first surface 11a of back yoke 11.

[0018] A plurality of permanent magnets 15 are provided on the first surface 14a of the back yoke 14. The plurality of permanent magnets 15 are arranged in a row in the longitudinal direction of the back yoke 14. Each permanent magnet 15 is fixed to the first surface 14a of the back yoke 14 via an adhesive (not shown).

[0019] The connecting member 16 is provided across the back yoke 11, the center yoke 13, and the back yoke 14. The connecting member 16 is connected to one longitudinal end of each of the back yoke 11, the center yoke 13, and the back yoke 14. The back yoke 11, the center yoke 13, and the back yoke 14 are each fixed to the connecting member 16.

[0020] The coil device 2 includes a plurality of bobbins 21 and a plurality of coils 22.

[0021] The multiple bobbins 21 are arranged in a row in the longitudinal direction of the center yoke 13. Each bobbin 21 is provided on the center yoke 13. Each bobbin 21 is slidable relative to the center yoke 13 in the longitudinal direction of the center yoke 13.

[0022] The multiple coils 22 are arranged in a row in the longitudinal direction of the center yoke 13. The multiple coils 22 are also provided one for each of the multiple bobbins 21. Therefore, each coil 22, together with its corresponding bobbin 21, is slidable relative to the center yoke 13 in the longitudinal direction of the center yoke 13.

[0023] The coils 22 are arranged farther from the first surface 11a of the back yoke 11 than the permanent magnets 12. The coils 22 are also arranged so as to face the permanent magnets 12.

[0024] The coils 22 are arranged farther from the first surface 14a of the back yoke 14 than the permanent magnets 15. The coils 22 are also arranged to face the permanent magnets 15.

[0025] A current is supplied to each of the coils 22 from a power supply device (not shown). When a current is supplied to each of the coils 22, an interaction occurs between the magnetic field generated by the plurality of permanent magnets 12 and the plurality of permanent magnets 15 and the current flowing through each of the coils 22. The interaction between the magnetic field generated by the plurality of permanent magnets 12 and the plurality of permanent magnets 15 and the current flowing through each of the coils 22 causes the coil device 2 to move along the longitudinal direction of the center yoke 13 relative to the stator 1.

[0026] Fig. 3 is a perspective view showing a state in which the conductor wire in the coil device 2 of Fig. 1 has started to be wound around a bobbin. Fig. 4 is a plan view showing the coil device 2 of Fig. 3. Fig. 5 is a bottom view showing the coil device 2 of Fig. 3. The coil 22 is formed by winding the conductor wire 3 around the bobbin 21.

[0027] The bobbin 21 includes a cylindrical portion 21a around which the conductive wire 3 is wound, a pair of flange portions 21b provided at both axial ends of the cylindrical portion 21a, and a stopper 21c. The cylindrical portion 21a, the pair of flange portions 21b, and the stopper 21c are integrally formed with one another.

[0028] The portion of the conductor 3 wound around the tubular portion 21a that is closest to the tubular portion 21a is referred to as the first row. The portion of the conductor 3 that is wound in contact with the outer periphery of the first row is referred to as the second row. The portion of the conductor 3 wound around the tubular portion 21a that is at one end in the axial direction is referred to as the first row. The conductor 3 starts to be wound around the tubular portion 21a from the first row of the first row. Figures 3, 4, and 5 show the first row of the first row and the second row of the first row of the conductor 3.

[0029] The front half of the first row of the first stage of the conducting wire 3 is arranged to contact the flange portion 21b. The front half of the first row of the first stage of the conducting wire 3 is the portion that is wound around the tubular portion 21a first when the entire first row of the first stage of the conducting wire 3 is divided into two portions in the longitudinal direction.

[0030] Stopper 21c is provided across tubular portion 21a and flange portion 21b. Stopper 21c is disposed between flange portion 21b and a rear half of the first row of the first stage of conductive wire 3. The rear half of the first row of the first stage of conductive wire 3 is the portion that will later be wound around tubular portion 21a when the entire first row of the first stage of conductive wire 3 is divided into two portions in the longitudinal direction.

[0031] The rear half of the first row of the first stage of the conducting wire 3 is arranged to contact the stopper 21c. The stopper 21c restricts the rear half of the first row of the first stage of the conducting wire 3 wound around the tubular portion 21a from moving in a direction approaching the flange portion 21b.

[0032] The height dimension of stopper 21c from cylindrical portion 21a is the same as the diameter dimension of conductive wire 3. As a result, the distance between the first row of the second stage of conductive wire 3 and cylindrical portion 21a is the same as the distance between the second row of the second stage of conductive wire 3 and cylindrical portion 21a. The height dimension of stopper 21c from cylindrical portion 21a is the dimension from the outer peripheral surface of cylindrical portion 21a to the outer peripheral surface of stopper 21c in a direction perpendicular to the outer peripheral surface of cylindrical portion 21a.

[0033] Stopper 21c protrudes from flange 21b toward the rear half of the first row of the first tier of conductor 3. The protruding dimension of stopper 21c continuously increases along flange 21b as it approaches the front half of the first row of the first tier of conductor 3. This allows the rear half of the first row of the first tier of conductor 3 to be positioned along stopper 21c.

[0034] The maximum protruding dimension of stopper 21c is equal to the diameter of conductor 3. This prevents a step from occurring between the rear half of the first row of the first stage of conductor 3 and the front half of the second row of the first stage of conductor 3.

[0035] The cylindrical portion 21a has a rectangular shape when viewed in the axial direction. The conducting wire 3 is made of aluminum. The cross section of the conducting wire 3 perpendicular to the longitudinal direction has a circular shape.

[0036] Fig. 6 is a longitudinal cross-sectional view showing a main part of the coil device 2 of Fig. 3. Fig. 6 shows a state in which the entire conductor 3 is wound around the cylindrical portion 21a of the bobbin 21. The stopper 21c restricts the movement of the rear half of the first row of the first stage of the conductor 3 in a direction approaching the flange portion 21b. This prevents the rear half of the first row of the first stage of the conductor 3 from being pushed out toward the flange portion 21b when the second row of the second stage of the conductor 3 is wound around the cylindrical portion 21a.

[0037] Next, a coil device 2A of a comparative example will be described. Fig. 7 is a perspective view showing a state in which the conductor wire 3 in the coil device 2A of the comparative example has started to be wound around a bobbin 21A. Fig. 8 is a plan view showing the coil device 2A of the comparative example of Fig. 7. Fig. 9 is a bottom view showing the coil device 2A of the comparative example of Fig. 7. Figs. 7, 8, and 9 show the first row of the first stage and the second row of the first stage of the conductor wire 3.

[0038] In the coil device 2A of the comparative example, the bobbin 21A includes a cylindrical portion 21aA and flange portions 21bA provided at both axial ends of the cylindrical portion 21aA. Unlike the bobbin 21 in the coil device 2 according to the first embodiment, the bobbin 21A does not include a stopper 21c.

[0039] In the coil device 2A of the comparative example, a space S is formed between the rear half of the first row of the first stage in the conducting wire 3 and the flange portion 21bA.

[0040] Fig. 10 is a longitudinal cross-sectional view showing a main part of the coil device 2A of the comparative example shown in Fig. 7. Fig. 10 shows a state in which the entire conductor 3 is wound around the cylindrical portion 21aA of the bobbin 21A. When the second row of the second stage of the conductor 3 is wound around the cylindrical portion 21aA, there is a risk that the latter half of the first row of the first stage of the conductor 3 may be pushed toward the flange portion 21bA. If the second row of the second stage of the conductor 3 pushes the latter half of the first row of the first stage of the conductor 3 toward the flange portion 21bA, the conductor 3 will become unwound.

[0041] On the other hand, in the coil device 2 according to the first embodiment, the rear half of the first row of the first stage in the conductor 3 is prevented from being pushed out toward the flange 21b by the stopper 21c, thereby preventing the conductor 3 from becoming unwound.

[0042] As described above, the coil device 2 according to the first embodiment includes a bobbin 21 and a coil 22 formed by winding the conductor wire 3 around the bobbin 21. The bobbin 21 has a cylindrical portion 21a around which the conductor wire 3 is wound, a flange portion 21b provided at an axial end of the cylindrical portion 21a, and a stopper 21c. The front half of the first row of the first stage of the conductor wire 3 wound around the cylindrical portion 21a is disposed so as to contact the flange portion 21b. The stopper 21c restricts the rear half of the first row of the first stage of the conductor wire 3 wound around the cylindrical portion 21a from moving in a direction approaching the flange portion 21b. This configuration can prevent the conductor wire 3 wound around the cylindrical portion 21a of the bobbin 21 from becoming unwound.

[0043] Furthermore, in the coil device 2 according to the first embodiment, the height dimension of the stopper 21c from the cylindrical portion 21a is the same as the diameter dimension of the conductor 3. With this configuration, the distance between the first row of the second stage of the conductor 3 and the cylindrical portion 21a can be made the same as the distance between the second row of the second stage of the conductor 3 and the cylindrical portion 21a. This makes it possible to make the distance between the cylindrical portion 21a uniform over the entire second stage of the conductor 3.

[0044] Furthermore, in the coil device 2 according to the first embodiment, the stopper 21c protrudes from the flange 21b toward the rear half of the first row of the first stage of the conductor 3, and the protruding dimension of the stopper 21c continuously increases toward the front half of the first row of the first stage of the conductor 3. According to this configuration, the rear half of the first row of the first stage of the conductor 3 can be arranged along the stopper 21c.

[0045] In the coil device 2 according to the first embodiment, the maximum value of the protruding dimension of the stopper 21c is equal to the diameter of the conductor 3. This configuration can prevent a step from occurring between the rear half of the first row of the first stage in the conductor 3 and the front half of the second row of the first stage in the conductor 3.

[0046] Furthermore, in the coil device 2 according to the first embodiment, the conductor 3 is made of aluminum. This configuration allows the weight of the coil device 2 to be reduced compared to when the conductor 3 is made of copper. When the conductor 3 is made of aluminum, the tension acting on the conductor 3 needs to be reduced compared to when the conductor 3 is made of copper. This reduces the frictional force generated between the first row of the first stage in the conductor 3 and the cylindrical portion 21a compared to when the conductor 3 is made of copper. However, the stopper 21c restricts the movement of the rear half of the first row of the first stage in the conductor 3 in the direction approaching the flange portion 21b.

[0047] In the coil device 2 according to the first embodiment, the cross section perpendicular to the longitudinal direction of the conductor 3 has a circular shape. This configuration makes it easier to manufacture the coil device 2 than when the cross section perpendicular to the longitudinal direction of the conductor 3 has a rectangular shape.

[0048] Moreover, the linear motor according to the first embodiment includes a coil device 2, a center yoke 13 that slidably supports the coil device 2, a permanent magnet 12 that is disposed opposite the coil device 2, and a back yoke 11 that supports the permanent magnet 12. When a current is supplied to the coil device 2, the coil device 2 moves relative to the permanent magnet 12. With this configuration, it is possible to prevent the conductive wire 3 wound around the cylindrical portion 21a of the bobbin 21 from becoming unwound.

[0049] In the coil device 2 and linear motor according to the first embodiment, the configuration of the linear motor has been described as including both the back yoke 11 and the back yoke 14. However, this configuration is not limited thereto. A linear motor configuration that does not include the back yoke 14 but includes the back yoke 11 may also be used.

[0050] Furthermore, in the coil device 2 and linear motor according to the first embodiment, the bobbin 21 has been described as having a configuration in which the cylindrical portion 21a, the pair of flanges 21b, and the stopper 21c are integrally formed with one another. However, this configuration is not limited thereto. For example, the cylindrical portion 21a and the pair of flanges 21b may be integrally formed with one another, and then the stopper 21c may be fixed to the cylindrical portion 21a or the flanges 21b.

[0051] In addition, in the coil device 2 and the linear motor according to the first embodiment, the conductor 3 is made of aluminum. However, this is not the only possible configuration. For example, the conductor 3 may be made of copper.

[0052] Furthermore, in the coil device 2 and linear motor according to the first embodiment, the conductor 3 has been described as having a circular cross section perpendicular to the longitudinal direction. However, this is not limiting. For example, the conductor 3 may have a rectangular cross section perpendicular to the longitudinal direction.

[0053] Although the coil device and linear motor according to the preferred embodiment 1 have been described above, the present invention is not limited to the coil device and linear motor according to the above-described embodiment 1. Various modifications and alterations can be made to the coil device and linear motor according to the above-described embodiment 1 without departing from the scope of the claims. [Explanation of symbols]

[0054] 1 stator, 2 coil device, 3 conducting wire, 11 back yoke (supporting member for permanent magnet), 11a first surface, 11b second surface, 12 permanent magnet, 13 center yoke (supporting member for coil device), 14 back yoke, 14a first surface, 14b second surface, 15 permanent magnet, 16 connecting member, 21 bobbin, 21a cylindrical portion, 21b flange portion, 21c stopper, 22 coil.

Claims

1. Bobbin (21) and a coil (22) formed by winding a conducting wire (3) around the bobbin (21); Equipped with The bobbin (21) has a cylindrical portion (21a) around which the conducting wire (3) is wound, a flange portion (21b) provided at an axial end of the cylindrical portion (21a), and a stopper (21c), The first half of the first row of the first stage of the conductor (3) wound around the cylindrical portion (21a) is arranged to contact the flange portion (21b), The stopper (21c) restricts the movement of the rear half of the first row of the first stage of the conductor (3) wound around the tubular portion (21a) in a direction approaching the flange portion (21b).

2. 2. The coil device according to claim 1, wherein the height of the stopper (21c) from the cylindrical portion (21a) is the same as the diameter of the conductor (3).

3. The stopper (21c) protrudes from the flange portion (21b) toward the rear half of the first row of the first stage, 3. The coil device according to claim 1, wherein the protruding dimension of the stopper (21c) increases continuously as it approaches the front half of the first row of the first stage.

4. 4. The coil device according to claim 3, wherein the maximum value of the protruding dimension of the stopper (21c) is equal to the diameter of the conductor (3).

5. 3. The coil device according to claim 1, wherein the conductor wire (3) is made of aluminum.

6. 3. The coil device according to claim 1, wherein the cross section of the conductor (3) perpendicular to the longitudinal direction has a circular shape.

7. A coil device (2) according to claim 1 or claim 2; a coil device support member (13) that slidably supports the coil device (2); a permanent magnet (12) provided opposite the coil device (2); a permanent magnet support member (11) that supports the permanent magnet (12); Equipped with A linear motor in which the coil device (2) moves relative to the permanent magnet (12) when a current is supplied to the coil (22).

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