JP2012151954A - Linear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear motor that appropriately supplies power to coils.SOLUTION: A linear motor 1 includes: a plurality of magnets 11; a plurality of coils 19; a pair of flat springs 23 disposed on both sides of the plurality of coils 19 with respect to the direction of drive to support the plurality of coils 19 entirely swingably in the direction of drive relative to the plurality of magnets 11; and a pair of terminals 9 for applying a voltage to the plurality of coils 19. Each coil 19 has an odd number of turns and has a wire material 25 extended from both axial end faces 19f. The pair of flat springs 23 are connected to a pair of wire material end portions (25s, 25e) of the wire material 25 extended from a pair of end faces 19f axially outward of all the plurality of coils 19. The pair of terminals 9 are connected to the pair of flat springs 23 and can be electrically connected to the plurality of coils 19 via the pair of flat springs 23.

Description

  The present invention relates to a linear motor such as a voice coil motor.

  A linear motor having a coil supported by a spring so as to be swingable with respect to a magnet is known (Patent Document 1, etc.).

JP 2000-205680 A

  In the linear motor in which the coil is driven as described above, it is difficult to supply power to the coil as compared with the linear motor in which the magnet is driven. This is because, for example, when a conducting wire for power supply (including both ends of a wire constituting the coil) is redundantly routed, the probability that the conducting wire is caught by a magnet or the like as the coil moves increases. It is. In Patent Document 1, the groove portion for accommodating the conducting wire is formed on the bobbin around which the coil is wound so that the conducting wire can be suitably routed. However, there is a disadvantage that the shape of the bobbin becomes complicated. Has occurred.

  The objective of this invention is providing the linear motor which can perform the electric power supply to a coil suitably.

  A linear motor according to an aspect of the present invention includes a plurality of magnets arranged in the driving direction with a magnetic pole in a direction orthogonal to the driving direction, and an outer circumferential surface or an inner circumferential surface that is coaxially disposed in the driving direction. Are disposed on both sides of the plurality of coils in the driving direction with respect to the plurality of coils, and the plurality of coils are swung in the driving direction with respect to the plurality of magnets. A pair of springs that are movably supported and a pair of terminals for applying a voltage to the plurality of coils, and the wire rods are displaced in the axial direction in each of the plurality of coils. One layer of the wire is formed by winding, and a plurality of layers are laminated from the inner peripheral side to the outer peripheral side by reversing the direction of shifting the axial position of the wire each time the one layer is formed And the number of the plurality of layers is an odd number. Thus, the wire extends from the coil end surfaces on both sides in the axial direction of each coil, and adjacent coils are connected by portions extending from the coil end surfaces facing each other of the wire, The pair of springs are connected to a pair of wire end portions extending from a pair of coil end faces facing the axially outer side of the whole of the plurality of coils of the wire, and the pair of terminals are It is connected to the pair of springs, and can be connected to the plurality of coils via the pair of springs.

  Preferably, the bobbin is further provided with the wire wound thereon to hold the plurality of coils, and an outer peripheral surface of the bobbin includes a plurality of recesses in which the plurality of coils are accommodated, and a space between the plurality of recesses. A first groove portion that accommodates a portion between the plurality of coils of the wire, and extends from both axial ends of the plurality of recesses outward in the axial direction of the bobbin to accommodate the pair of wire end portions. A pair of second grooves, and the pair of springs has a portion exposed in the second groove from both axial outer sides of the bobbin, and the exposed portion includes the first groove The ends of the pair of wire rods are connected.

  Preferably, the plurality of magnets are disposed on the opposite side of the plurality of coils, the magnet-side yoke to which the plurality of magnets are fixed, and the plurality of coils are disposed on the opposite side of the plurality of magnets. A coil-side yoke, and a connecting member that connects the magnet-side yoke and the coil-side yoke, and the pair of springs are supported by the magnet-side yoke, the coil-side yoke, and the connecting member. At the same time, the whole of the plurality of coils is supported so as to be swingable with respect to the plurality of magnets.

  Preferably, the connecting member is made of a nonmagnetic material.

  Preferably, the clearance between the inner peripheral surface and the outer peripheral surface of the plurality of coils, and the plurality of magnets or a member fixed to the plurality of magnets facing the one surface, It is below the diameter of the said wire.

  Preferably, each of the pair of springs is configured by a leaf spring, and each leaf spring is fixed to the plurality of magnets and fixed to the plurality of coils. And a plurality of arms that connect the magnet side fixing part and the coil side fixing part, and in each leaf spring, one of the pair of terminals and the wire rod include the magnet side fixing part and The coil side fixing portion is connected to a portion connected to both ends of one of the plurality of arms.

  According to said structure, the electric power supply to a coil can be performed suitably.

The typical sectional view showing the appearance of the linear motor concerning the embodiment of the present invention. The figure which shows a part of FIG. 1 more typically. The figure which looked at the needle | mover of the linear motor of FIG. 1 from the paper surface lower side of FIG. The schematic diagram which looked at the leaf | plate spring to which the terminal of the linear motor of FIG. 1 was connected to the axial CA direction. The enlarged view of the area | region V of FIG.

  FIG. 1 is a cross-sectional view showing a linear motor 1 according to an embodiment of the present invention. In FIG. 1, the depth of the linear motor 1 is also shown as a perspective view for easy understanding. The outer shape of the linear motor 1 is formed in a substantially cylindrical shape, and FIG. 1 shows a cross section along the central axis (axis CA) of the cylinder.

  The linear motor 1 is configured as a so-called voice coil motor that exhibits a driving force in the direction of the axis CA. The linear motor 1 includes a stator 3, a mover 5 that can move in the axis CA direction with respect to the stator 3, a pair of spring assemblies 7 that support the mover 5 so as to be swingable in the axis CA direction, And a pair of terminals 9 to which power is supplied from a power supply device (not shown).

  The stator 3 has a pair of magnets 11, a center yoke 13 and an outer yoke 15 for suitably forming a magnetic circuit related to the magnets 11, and a pair of connecting members 17 for connecting these yokes. is doing. The mover 5 includes a pair of coils 19 and a bobbin 21 that holds the coils 19.

  The magnet 11 is generally provided in an annular shape centered on the axis CA. The magnet 11 may be integrally formed in an annular shape, or may be configured by arranging a plurality of magnets in an annular shape. The cross-sectional shape parallel to the axis CA of the magnet 11 is, for example, a rectangle. The magnet 11 is magnetized in the radial direction (direction perpendicular to the driving direction). The pair of magnets 11 have magnetic poles in opposite directions.

  The center yoke 13 and the outer yoke 15 are made of a magnetic material. The magnetic body is, for example, iron (SS400 or the like). These yokes are provided in a cylindrical shape with the axis CA as a general axis. These yokes may be integrally formed in a cylindrical shape, or may be configured by arranging a plurality of magnetic bodies in an annular shape. In addition, a slit may be appropriately formed for the purpose of suitably cooling the linear motor 1.

  The inner diameter of the outer yoke 15 is larger than the outer diameter of the center yoke 13, and a space for accommodating the magnet 11 and the mover 5 is formed between the outer peripheral surface of the center yoke 13 and the inner peripheral surface of the outer yoke 15. Has been. The magnet 11 is fixed to the outer peripheral surface of the center yoke 13. Fixing is performed by, for example, an adhesive or a bolt.

  The connecting member 17 is made of a nonmagnetic material. Nonmagnetic materials are, for example, copper, aluminum, stainless steel, and resin. The connecting member 17 has a substantially disk shape whose center is approximately the axis CA. The connecting member 17 is disposed so as to close the gap between the center yoke 13 and the outer yoke 15 from the outside in the axis CA direction. And it is being fixed to each of the outer yoke 15. Fixing is performed by, for example, an adhesive or a bolt. The connecting member 17 may be provided only on one side in the axis CA direction.

  The coil 19 is formed in an annular shape that is generally centered on the axis CA. The cross-sectional shape parallel to the axis CA of the coil 19 is generally rectangular. The inner diameter of the coil 19 is larger than the outer diameter of the magnet 11, and the inner peripheral surface of the coil 19 faces the outer peripheral surface (magnetic pole) of the magnet 11. The distance in the axis CA direction between the center positions of the pair of coils 19 and the distance in the axis CA direction between the center positions of the pair of magnets 11 are substantially the same.

  The bobbin 21 is made of a nonmagnetic and nonconductive material such as resin. The bobbin 21 is generally formed in a cylindrical shape centered on the axis CA. However, an annular recess 21a is formed on the outer peripheral surface, and the coil 19 is fitted. In addition, it is preferable that the outer peripheral surface of the coil 19 and the outer peripheral surface of the bobbin 21 (region in which the recessed part 21a is not formed) are flush with each other.

  The inner peripheral surface of the bobbin 21 faces the outer peripheral surface of the magnet 11 with a predetermined clearance. Further, the outer peripheral surface of the coil 19 and the outer peripheral surface of the bobbin 21 are opposed to the inner peripheral surface of the outer yoke 15 with a predetermined clearance. These clearances are preferably set to be relatively narrow, for example, preferably not more than the diameter of the wire 25 (see FIG. 2) constituting the coil 19.

  The spring assembly 7 is configured by laminating a plurality of leaf springs 23 in the axial CA direction. The leaf spring 23 is generally formed in an annular shape centering on the axis CA. The outer peripheral side portion is on the stator 3 (specifically, at least one of the outer yoke 15 and the connecting member 17), and the inner peripheral side portion is on the outer side. It is fixed to the mover 5 (specifically, the bobbin 21). Fixing is performed by, for example, an adhesive or a bolt. For example, the outer yoke 15 and the connecting member 17 are fixed to each other by bolts, and the leaf spring 23 is sandwiched between the outer yoke 15 and the connecting member 17.

  The leaf spring 23 is formed of a conductive material and is also used to electrically connect the terminal 9 and the coil 19 as will be described later. The material of the leaf spring 23 is preferably nonmagnetic, and examples of such a nonmagnetic and conductive material include copper, aluminum, and stainless steel. In particular, stainless steel is preferable from the viewpoint of life and electric resistance.

  The terminal 9 is connected to the leaf spring 23 located closest to the coil 19 among the plurality of leaf springs 23. Note that the terminal 9 may be formed integrally with the leaf spring 23, or may be formed by a member different from the leaf spring 23 and fixed to the leaf spring 23. For example, the terminal 9 protrudes from the outer peripheral edge of the leaf spring 23.

  Although not particularly illustrated, in the linear motor 1, the center yoke 13, the outer yoke 15, and the connecting member 17 are appropriately positioned in order to extract the movement of the mover 5 in the stator 3 to the outside of the stator 3. A hole is formed, and a driven member (not shown) is connected to the mover 5 through the hole.

  FIG. 2 is a diagram schematically showing a part (movable element 5) of FIG.

  The two coils 19 are configured by winding one wire 25 around the bobbin 21. More specifically, in each coil 19, the wire 25 is first wound in contact with the bobbin 21. At this time, as indicated by the arrow y1, the position of the portion of the wire 25 that is newly wound around the bobbin 21 is one side in the direction of the axis CA in an amount corresponding to the diameter of the wire 25 with respect to one turn (see FIG. 2 is shifted to the right). Thereby, the innermost layer of the coil 19 is formed.

  When the innermost layer of the coil 19 is formed, the position of the portion of the wire 25 that is newly wound around the bobbin 21 is shifted to the other side in the axis CA direction (left side in FIG. 2). Thereby, the second layer portion from the inner peripheral side of the coil 19 is formed. By repeating the same operation, the wire 25 is wound from the inner peripheral side to the outer peripheral side while forming a layer of the wire 25.

  Note that, in a plurality of layers from the inner peripheral side to the outer peripheral side, the number of wires 25 arranged in the axis CA direction of the coil 19 is set so that the end face 19f of the coil 19 facing in the axis CA direction is substantially flat. Yes. For example, the number of wires 25 arranged in the direction of the axis CA is set to be the same between the plurality of layers. Or the number of arrangement | sequence of the wire 25 in the axis | shaft CA direction of each layer is set to 1 more or less with respect to an adjacent layer, and mutually the same with two adjacent layers.

  In each coil 19, the number of layers of the wire 25 from the inner peripheral side to the outer peripheral side is an odd number. Accordingly, the wire 25 extends from the end surfaces 19 f on both sides of each coil 19 in the axial direction. When the number of layers of the wire 25 from the inner peripheral side to the outer peripheral side is an even number, the wire 25 extends from only one side in the axis CA direction.

  The two coils 19 are connected to each other by the portions of the wire 25 that extend from the end surfaces 19f facing each other (the intermediate portion 25m together). Further, the portions (start end 25s, end 25e) extending from the end face 19f facing the outside of the two coils 19 are connected to a leaf spring 23 connected to the terminal 9 (FIG. 1).

  FIG. 3 is a view of the mover 5 as viewed from the lower side (the direction orthogonal to the drive direction) of FIGS. 1 and 2.

  Arrows y3 and y5 indicate the winding direction of each coil 19 from the start end 25s side to the end end 25e side of the wire rod 25. As indicated by arrows y3 and y5, the two coils 19 are wound in reverse. Accordingly, when a voltage is applied to the start end 25s and the end end 25e, currents whose directions of rotation about the axis CA are opposite to each other flow through the two coils 19.

  Grooves 21s, 21e, and 21m are formed on the outer peripheral surface of the bobbin 21 to accommodate the start end 25s, the end 25e, and the intermediate portion 25m (see also FIGS. 1 and 2). The groove portions 21s and 21e communicate the concave portion 21a with the axially outer side of the bobbin 21, and the groove portion 21m communicates the two concave portions 21a.

  These grooves are preferably formed parallel to the axis CA. The depth of these groove portions is at least equal to or greater than the depth of the recess 21a in the vicinity where the wire 25 extends from the inner peripheral side (axis CA side) of the coil 19 (the left side of each coil 19 in FIG. 2). In other positions, the diameter is equal to or larger than the diameter of the wire 25. In FIG. 2, the depth of the groove is the same as the depth of the recess 21a throughout. Further, the width of these groove portions is equal to or larger than the diameter of the wire 25.

  1 to 3, the positions of the grooves 21s, 21e, and 21m (the start end 25s, the end 25e, and the intermediate portion 25m) around the axis CA are the same. In other words, these groove portions (extending portions of the wire rods) are arranged on the same line as viewed in the radial direction. However, these groove portions (extension portions of the wire rods) may have different positions around the axis CA. Further, in FIG. 1, the positions of the groove portions around the axis CA and the positions of the terminals 9 around the axis CA are the same, but they may be different from each other (an example in which they are different in FIG. 4 described later). To do.)

  FIG. 4 is a schematic view of the leaf spring 23 to which the terminal 9 is connected as seen in the direction of the axis CA. Except for the connection of the terminals 9, the other leaf springs 23 have the same configuration as the leaf spring 23 shown in FIG.

  The leaf spring 23 is formed, for example, by forming a plurality of spiral slits 23s on an annular plate. The leaf spring 23 includes an outer peripheral side fixing portion 23a fixed to the stator 3, an inner peripheral side fixing portion 23b fixed to the mover 5, an outer peripheral side fixing portion 23a, and an inner peripheral side fixing portion 23b. And a plurality of arms 23c to be connected.

  Due to the elastic deformation of the arm 23c, the outer peripheral side fixing portion 23a and the inner peripheral side fixing portion 23b are allowed to move relative to each other in the direction of the axis CA (the through direction in FIG. 4). CA swing is allowed. In addition, it is preferable that the plurality of leaf springs 23 are overlapped with their positions around the axis CA being equally shifted so that the distribution of the restoring force around the axis CA is not biased.

  The terminal 9 is connected to the outer peripheral side fixing portion 23a, and the starting end 25s or the terminal end 25e of the wire 25 is connected to the connecting portion 23d of the inner peripheral side fixing portion 23b. The connecting portion 23d is exposed in the groove portion 21s or 21e from the outside of the bobbin 21 in the axial CA direction.

  The connection between the wire 25 and the connecting portion 23d is made by, for example, solder. The connecting portion 23d is an arbitrary portion of the leaf spring 23, and may have the same configuration as the other portions, or may have a different configuration from other portions, such as being plated to strengthen the connection. It may be.

  Preferably, the terminal 9 and the connecting portion 23d are provided at portions of the outer peripheral side fixing portion 23a and the inner peripheral side fixing portion 23b that are connected to both ends of one arm 23c. Therefore, as shown by the arrow y7, the current path from the terminal 9 to the connection portion 23d is approximately the length of one arm 23c. In FIG. 1, for convenience of illustration of the terminal 9, the position around the axis CA of the groove portion 21 s or 21 e where the connecting portion 23 d is exposed is the same as the position around the axis CA of the terminal 9.

  FIG. 5 is an enlarged view of a region V in FIG.

  The leaf spring 23 provided with the terminals 9 is insulated from other conductive members. Specifically, for example, an insulating layer 27 is provided between the plate spring 23 provided with the terminal 9 and another plate spring 23 and between the plate spring 23 provided with the terminal 9 and the outer yoke 15. Is formed. The insulating layer 27 is made of, for example, rubber or flexible resin.

  The operation of the linear motor 1 having the above configuration will be described.

  In the linear motor 1, a magnetic field is formed by the magnet 11 as indicated by an arrow y 11 in FIG. Specifically, the lines of magnetic force emitted from the N pole of the magnet 11 (the magnet 11 on the right side in FIG. 1) with the N pole facing the outer periphery penetrate the coil 19 facing the magnet 11 radially outward. Then, the outer yoke 15 is advanced in the direction of the axis CA, the adjacent coil 19 is penetrated radially inward, and the S pole of the adjacent magnet 11 is entered. Magnetic field lines coming out of the N pole of the magnet 11 (the magnet 11 on the left side in FIG. 1) facing the N pole on the inner circumferential side proceed in the direction of the axis CA through the center yoke 13 and enter the S pole of the adjacent magnet 11. . Thus, the magnetic flux of the magnet 11 penetrates the coil 19 in the radial direction.

  Therefore, when a voltage is applied to the pair of terminals 9 and a current is passed through the coil 19, a force in the direction of the axis CA that drives the coil 19 against the magnetic field (magnet 11) is generated according to Fleming's left-hand rule. The two coils 19 have the magnetic flux penetrating directions opposite to each other, but the current directions are also opposite to each other, so that forces in the same direction are generated.

  An AC voltage is applied to the coil 19. Therefore, the magnitude and direction of the force generated in the coil 19 vary with changes in the magnitude and direction of the voltage. When the frequency of the AC voltage (force) is approximately equal to the natural frequency defined by the mass of the driven object and the restoring force of the spring assembly 7 or the like, resonance occurs and a large driving force is obtained. Note that the AC voltage may be a voltage whose potential is continuously changed, represented by a sine wave or the like, or a pulse-like voltage whose potential change is discontinuous.

  Here, the linear motor 1 has a configuration in which both the center yoke 13 and the outer yoke 15 are fixed with respect to the magnet 11, and the bobbin 21 that moves relative to the magnet 11 is made of a non-conductive material. It is configured. Therefore, generation of eddy current due to relative movement of the magnet 11 with respect to other members is suppressed. In other words, since it is a coil drive, the iron loss is reduced as compared with the case of a magnet drive. Further, since currents flow through the two coils 19 in opposite directions, the magnetic fluxes generated by the current flowing in the coils 19 are reversed, cancel each other, and iron loss is reduced.

  According to the above embodiment, the linear motor 1 includes a plurality of (two in this embodiment) magnets 11 arranged in the drive direction with the magnetic poles oriented in the direction orthogonal to the drive direction (axis CA direction), and the drive. A plurality of (two in this embodiment) coils 19 (coil assemblies), which are arranged coaxially in the direction and whose outer peripheral surface or inner peripheral surface (inner peripheral surface in this embodiment) faces the magnetic poles of the plurality of magnets 11; A pair of leaf springs 23 arranged on both sides in the driving direction with respect to the plurality of coils 19 and supporting the plurality of coils 19 so as to be swingable in the driving direction with respect to the plurality of magnets 11; 19 has a pair of terminals 9 for applying a voltage. In each of the plurality of coils 19, the wire 25 is wound while shifting the position in the axial direction to form one layer of the wire 25, and the axial position of the wire 25 is configured each time the one layer is formed. By reversing the direction of shifting, a plurality of layers are laminated from the inner peripheral side to the outer peripheral side, and by making the number of the plurality of layers an odd number, the wire rod 25 extends from the end surfaces 19f on both sides in the axial direction of each coil 19. I'm out. The adjacent coils 19 are connected to each other by portions of the wire 25 that extend from the end surfaces 19f facing each other. A pair of leaf springs 23 (the one closest to the coil 19 of the spring assembly 7) is a pair of wire rods extending from a pair of end surfaces 19f of the wire rod 25 facing the outside in the axial direction of the entire plurality of coils 19. It is connected to the end (25s, 25e). The pair of terminals 9 are connected to the pair of leaf springs 23, and can be electrically connected to the plurality of coils 19 via the pair of leaf springs 23.

  Therefore, the conducting wire (wire 25) for applying a voltage to the plurality of coils 19 is not redundantly routed. As a result, it is possible to suppress power from being caught by another member and to suitably supply power to the coil 19. Further, it is possible to facilitate the winding process of the wire rod 25 due to the simplification of the wiring, and to simplify the shape of the bobbin 21. As a result, cost reduction is expected.

  The linear motor 1 further includes a bobbin 21 on which a wire 25 is wound to hold a plurality of coils 19. On the outer peripheral surface of the bobbin 21, there are a plurality of recesses 21a in which a plurality of coils 19 are accommodated, a groove portion 21m that extends between the plurality of recesses 21a and accommodates an intermediate portion 25m between the plurality of coils 19 of the wire rod 25, and a plurality of A pair of groove portions 21s and 21e are formed extending from both ends in the axial CA direction of the entire recess 21a to both outer sides in the axial CA direction of the bobbin 21 and accommodating a pair of wire rod end portions (start end 25s, end 25e). . The pair of leaf springs 23 (the leaf springs 23 on which the terminals 9 are formed) have connection portions 23d that are exposed in the groove portions 21s and 21e from both outsides in the axial CA direction of the bobbin 21, and the connection portion 23d has a start end 25s. And a terminal end 25e are connected.

  Therefore, the intermediate portion 25m, the start end 25s, and the end end 25e are accommodated in the bobbin 21 and do not need to be routed outside the bobbin 21. Therefore, the probability that the wire 25 is caught by another member is further reduced.

  The linear motor 1 is disposed on the opposite side of the plurality of coils 19 of the plurality of magnets 11, and is disposed on the opposite side of the plurality of magnets 11 to the center yoke 13 to which the plurality of magnets 11 are fixed. The outer yoke 15 and the connecting member 17 that connects these yokes are provided. The pair of leaf springs 23 (the leaf springs 23 on which the terminals 9 are formed) are supported by the center yoke 13, the outer yoke 15, and the connecting member 17, and support the whole of the plurality of coils 19. The plurality of coils 19 are supported in a swingable manner with respect to the magnet 11.

  Therefore, as described above, a configuration in which the magnet 11 does not move relative to the yoke and the generation of eddy current is suppressed is realized. Since such a configuration is configured by a combination of a plurality of members including the connecting member 17, a design change or the like is easy.

  The connecting member 17 is made of a nonmagnetic material. Therefore, compared with the case where the connecting member 17 is formed of a magnetic material (this case is also included in the present invention), the balance of the magnetic flux density becomes better and a stable driving force can be obtained.

  The clearance between the outer peripheral surface of the plurality of coils 19 and the outer yoke 15 that faces the outer peripheral surface and is fixed to the plurality of magnets 11 is equal to or smaller than the diameter of the wire 25. Therefore, the linear motor 1 can be downsized. It is also expected that the magnetic flux at the position of the coil 19 will increase. Such a clearance setting is preferably realized by eliminating the need for the conducting wire to pass on the outer peripheral surface of the coil 19 by the simple wiring described above.

  Each of the pair of leaf springs 23 (the leaf springs 23 on which the terminals 9 are formed) includes an outer peripheral side fixing portion 23 a fixed to the plurality of magnets 11, and an inner peripheral side fixing portion 23 b fixed to the plurality of coils 19. And a plurality of arms 23c for connecting them. In each leaf spring 23, the terminal 9 and the wire 25 are connected to portions of the outer peripheral side fixing portion 23a and the inner peripheral side fixing portion 23b that are connected to both ends of one arm 23c of the plurality of arms 23c. .

  Accordingly, it is possible to obtain a restoring force suitably, and as described with reference to the arrow y7 in FIG. 4, a current flows in a substantially shortest path of the leaf spring 23, and iron loss is suppressed. The

  In the above embodiment, the groove portion 21m is an example of the first groove portion of the present invention, the groove portions 21s and 21e are an example of the pair of second groove portions of the present invention, and the center yoke 13 is the magnet side of the present invention. The outer yoke 15 is an example of the coil side yoke of the present invention, the outer peripheral side fixing portion 23a is an example of the magnet side fixing portion of the present invention, and the inner peripheral side fixing portion 23b is the coil of the present invention. It is an example of a side fixing | fixed part.

  The present invention is not limited to the above embodiment, and may be implemented in various aspects.

  The present invention is suitably applied to a linear motor in which a coil constitutes a mover, but a linear motor in which a magnet constitutes a mover and a linear motor in which both the coil and the magnet serve as a mover with respect to other members. May be applied.

  The yoke, connecting member, and bobbin are not essential requirements, and may be omitted as appropriate. The bobbin may also serve as a yoke.

  The positional relationship between the magnet and the coil is not limited to that in which the magnet is arranged on the inner peripheral side of the coil. That is, a magnet may be disposed on the outer peripheral side of the coil, or a magnet may be disposed on both the inner peripheral side and the outer peripheral side of the coil.

  In relation to the above, in the embodiment, the outer peripheral surface of the coil faces the yoke with a predetermined clearance, but the outer peripheral surface of the coil may face the magnet disposed on the outer peripheral side of the coil with a predetermined clearance. The bobbin may be omitted and the inner peripheral surface of the coil may face the magnet or yoke disposed on the inner peripheral side of the coil with a predetermined clearance.

  The spring is not limited to a leaf spring. For example, the coil spring arrange | positioned between the end surface of the axis CA direction of the bobbin 21 of embodiment and the inner surface orthogonal to the axis | shaft CA of the connection member 17 may be sufficient.

  In the case where the spring is a leaf spring, the leaf spring is not limited to the one that supports the coil from the outer peripheral side or the one that supports the coil from the side opposite to the magnet of the coil. That is, the leaf spring may support the coil from the inner peripheral side (the inner peripheral side may be the magnet side or the coil side as described above), or the magnet side (as described above). The magnet side may be the inner peripheral side or the outer peripheral side.) The coil may be supported. Further, a plurality of leaf springs do not need to be stacked and may be used alone.

  The number of the plurality of magnets and the number of the plurality of coils are not limited to two. That is, these numbers may be three or more. The plurality of coils may not be constituted by a single wire. For example, two wire rods may be connected to each other between adjacent coils, and may be substantially one wire rod. The wire is not limited to a round wire and may be a flat wire.

  The coil need not be perfectly aligned and may be partially distorted. However, the closer to perfect alignment winding, the easier it is to obtain the effect of miniaturization of the linear motor by shortening the routing of the conducting wire. In aligned winding, each part in each layer of the wire may not be positioned between the axial (CA) directions of each part of the wire in the adjacent layer, and the position in the axial direction may be the same as each part of the wire in the adjacent layer. (Especially for flat wires.)

  The magnet, the coil, the yoke, the connecting member, and the spring may not be formed in a circular shape when viewed in the driving direction, and may be formed in an elliptical shape or a rectangular shape, for example. Further, the magnet, the yoke, the connecting member, and the spring may not be formed in an annular shape when viewed in the driving direction, and may be provided only on one side with respect to the driving direction, for example.

  The wire and the spring may be connected via another member, and the spring and the terminal may be connected via another member. When the terminal is integrated with the spring, the terminal does not necessarily need to be distinguishable from the spring. For example, if a wire for applying a voltage to the coil via a spring is connected to an appropriate part of the spring, the part is a terminal.

  The linear motor may be used not only by being supplied with an alternating current but also by being supplied with a direct current, or may be used by periodically supplying only a current flowing in one direction through the wire. .

  In addition, the linear motor of this invention may be used for appropriate apparatuses, such as a compressor for refrigerators.

  DESCRIPTION OF SYMBOLS 1 ... Linear motor, 9 ... Terminal, 11 ... Magnet, 19 ... Coil, 19f ... End surface, 23 ... Leaf spring, 25 ... Wire rod, 25s ... Start end (wire end portion), 25e ... End (wire end portion).

Claims (6)

A plurality of magnets arranged in the driving direction with the magnetic poles oriented in a direction perpendicular to the driving direction;
A plurality of coils arranged coaxially in the drive direction, the outer peripheral surface or the inner peripheral surface facing the magnetic poles of the plurality of magnets;
A pair of springs arranged on both sides in the driving direction with respect to the plurality of coils, and supporting the plurality of coils so as to be swingable in the driving direction with respect to the plurality of magnets;
A pair of terminals for applying a voltage to the plurality of coils;
Have
In each of the plurality of coils, the wire is wound while shifting the position in the axial direction to form one layer of the wire, and the axial position of the wire is shifted each time the one layer is formed. By reversing the direction, a plurality of layers are laminated from the inner peripheral side to the outer peripheral side, and by making the number of the plurality of layers an odd number, the wire extends from the coil end faces on both sides in the axial direction of each coil. And
Adjacent coils are connected by portions extending from the coil end faces facing each other of the wire,
The pair of springs are connected to a pair of wire ends extending from a pair of coil end faces facing the axially outer side of the entire plurality of coils of the wire,
The pair of terminals are connected to the pair of springs, and are capable of conducting with the plurality of coils via the pair of springs. A bobbin that holds the plurality of coils around which the wire is wound;
On the outer peripheral surface of the bobbin,
A plurality of recesses for accommodating the plurality of coils;
A first groove extending between the plurality of recesses and accommodating a portion of the wire between the plurality of coils;
A pair of second grooves extending from both axial ends of the plurality of recesses to both outer sides in the axial direction of the bobbin, and accommodating the pair of wire rod end portions;
Is formed,
The pair of springs have a portion exposed in the second groove from both axial outer sides of the bobbin, and the pair of wire end portions are connected to the exposed portion. The linear motor described. A magnet-side yoke disposed on a side opposite to the plurality of coils of the plurality of magnets, and the plurality of magnets being fixed;
A coil side yoke disposed on the opposite side of the plurality of coils from the plurality of magnets;
A connecting member for connecting the magnet side yoke and the coil side yoke;
Have
The pair of springs are supported by the magnet side yoke, the coil side yoke and the connecting member, and support the whole of the plurality of coils, thereby swinging the whole of the plurality of coils with respect to the plurality of magnets. The linear motor according to claim 1, wherein the linear motor is supported. The linear motor according to claim 3, wherein the connecting member is formed of a nonmagnetic material. The clearance between the inner peripheral surface and the outer peripheral surface of the plurality of coils and the plurality of magnets or a member fixed to the plurality of magnets facing the one surface is the diameter of the wire. It is the following. The linear motor of any one of Claims 1-4. Each of the pair of springs is constituted by a leaf spring,
Each leaf spring
A magnet side fixing portion fixed to the plurality of magnets;
A coil side fixing portion fixed to the plurality of coils;
A plurality of arms connecting the magnet side fixing portion and the coil side fixing portion;
Have
In each leaf spring, one of the pair of terminals and the wire are connected to portions of the magnet side fixing portion and the coil side fixing portion that are connected to both ends of one arm of the plurality of arms. The linear motor according to any one of claims 1 to 5.

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