WO2013054572A1

WO2013054572A1 - Linear motor

Info

Publication number: WO2013054572A1
Application number: PCT/JP2012/066773
Authority: WO
Inventors: 佐々木　篤志; 敏夫山田; 真一斉藤; 克如堀江; 里海五明
Original assignee: 株式会社コガネイ
Priority date: 2011-10-12
Filing date: 2012-06-29
Publication date: 2013-04-18
Also published as: JP5728354B2; JP2013085405A

Abstract

This linear motor has: a coil unit (21) composed of multiple coil assemblies (20); and permanent magnets. Each coil assembly (20) has a cylindrical bobbin (27) around which a coil (32) is provided. A wire connection pin (35a) for connecting to one end of a magnet wire (31) is provided on one end of the bobbin (27), and a wire connection pin (35b) for connecting to the other end of the magnet wire is provided on the other end of the bobbin (27). Connection sections (33b, 33c) serving as joint sections are provided on each bobbin (27), whereby wire connection pins (35a, 35b) of the coil assemblies (20) in the same phase are connected together via joint metal fittings (37) inserted in the connection sections (33b, 33c).

Description

Linear motor

The present invention relates to a linear motor that linearly reciprocates a moving member.

The linear motor includes a magnet unit having a plurality of permanent magnets arranged linearly and a coil unit formed by arranging a plurality of coil assemblies linearly along the magnetic pole arrangement direction of the magnet unit. The magnet unit and the coil unit are relatively movable. When a plurality of coils of the coil assembly are energized sequentially while changing the magnitude of the current, and the attractive force or repulsive force between the magnetic poles of the permanent magnet is changed, the thrust in the arrangement direction is generated between the magnet unit and the coil unit. The magnet unit and the coil unit are relatively driven in the arrangement direction.

Patent Document 1 describes a linear motor having a field element provided with a plurality of permanent magnets and an armature composed of a coil unit, and reciprocating the coil unit linearly. Patent Document 2 describes a linear motor that includes a stator provided with a plurality of coils and a mover provided with a permanent magnet, and is configured to reciprocate the mover linearly.

JP 2004-357353 A JP 2008-79358 A

The coil unit is formed by, for example, arranging a plurality of coils, such as three phases of U phase, V phase, and W phase, in a straight line, and coils of the same phase jump to coils of other adjacent phases. And connected. As described in Patent Document 2, in a linear motor in which a permanent magnet is arranged in a linearly reciprocable manner inside a coil, a crossover can be incorporated in a radially outward portion of the coil. However, in the linear motor in which the permanent magnet is arranged outside the coil, the gap between the inner surface of the permanent magnet and the outer surface of the coil can be reduced by winding the crossover wire outside the coil. Disappear. When the gap between the permanent magnet and the coil becomes large, it becomes impossible to apply a large thrust to the moving member.

On the other hand, the linear motor described in Patent Document 1 has a coil unit formed by resin-molding a three-phase coil. Each resin mold is provided with a connecting portion protruding outward, and the adjacent coil units are electrically connected by connecting the connecting portions. As described above, if the connecting portion protrudes outward from the resin-molded coil unit, the coil unit cannot be arranged inside the cylindrical permanent magnet.

It is an object of the present invention to provide a linear motor in which a coil unit is disposed inside a permanent magnet and the permanent magnet reciprocates relative to the coil unit. Is to simplify the process.

Another object of the present invention is to prevent the wiring from running around the outside of the coil unit in the linear motor, and to eliminate the soldering work so that a failure such as disconnection does not occur.

The linear motor of the present invention includes a rod on which a plurality of coil assemblies are fixed on the outside, and a permanent magnet disposed on the outside of the coil assembly, and one of the rod and the permanent magnet is axially disposed. Each of the coil assemblies includes a cylindrical bobbin provided with a coil formed by winding a magnet wire and disposed on the outside of the rod, and one end surface of the bobbin. A wire connecting pin on one end side which is provided to be positioned radially inward of the coil and to which one end of the magnet wire is connected; and the magnet wire which is positioned to be radially inward of the coil on the other end surface of the bobbin. A wire connecting pin on the other end side to which the other end of the coil is connected, and a relay portion provided on the bobbin inward in the radial direction of the coil. The wire connecting pin body, characterized in that it is connected to the wire connecting pins of the coil assembly of the other the same phase via the relay portion of the coil assembly of at least one other phase.

The coil assembly of the linear motor has a bobbin and a coil formed by a magnet wire wound around the bobbin, and a multi-phase coil assembly is arranged inside the permanent magnet. In the coil assembly, both the wire connection pin and the relay portion are provided on the radially inner side of the coil and are shifted from each other in the circumferential direction. As a result, when a plurality of coil assemblies are arranged in a straight line, the wire connection pins of the coil of the same phase are connected via the relay portion inside the coil, so that it is not necessary to squeeze the connection wiring outside the coil It becomes. Therefore, the gap between the inner peripheral surface of the permanent magnet and the outer peripheral surface of the coil can be reduced, and a large thrust can be obtained without increasing the diameter of the coil.

Coils having the same phase can be connected to each other only by arranging a plurality of coil assemblies one after another while abutting one end face of the bobbin of the coil assembly and the other end face of the adjacent coil assembly. . Therefore, it is possible to easily assemble the coil assembly, and it is possible to easily increase the number of coil assemblies corresponding to the stroke of the linear motor. Further, since there is no wiring work such as soldering, it is possible to provide a linear motor that does not cause a failure such as disconnection. Since it is sufficient to prepare two types of coil assemblies, forward winding and reverse winding, it is easy to prepare a member for manufacturing a linear motor.

(A) is a longitudinal cross-sectional view which shows the linear motor which is one Embodiment of this invention, (B) is a top view of (A). 2A is a cross-sectional view taken along line 2A-2A in FIG. 1A, and FIG. 2B is a cross-sectional view taken along line 2B-2B in FIG. It is a partial saving front view which expands and shows the coil unit shown by FIG. 1 (A). It is a longitudinal cross-sectional view of FIG. 5A is a cross-sectional view taken along line 5A-5A in FIG. 4, and FIG. 5B is a cross-sectional view taken along line 5B-5B in FIG. It is a perspective view which shows a part of coil assembly which comprises a coil unit. FIG. 7 is a partially cutaway perspective view of FIG. 6. It is a partial omission connection diagram of the coil provided in the coil unit. It is a disassembled perspective view which shows a part of coil unit of the linear motor which is other embodiment of this invention. FIG. 10 is a development view of FIG. 9. It is sectional drawing which shows the one end part of a coil unit. It is sectional drawing which shows the modification of a rod. It is sectional drawing which shows the modification of a rod.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The linear motor has a motor case 11 as shown in FIG. The motor case 11 has a case body 11a to which

end plates

12a and 12b are attached at both ends, and a case cover 11b is attached to the case body 11a. A rectangular moving table 13 is mounted on the outside of the case cover 11b so as to be linearly reciprocable. The moving table 13 is provided with guides provided on both sides of the guide portion 14 of the case cover 11b as shown in FIG. Guided through the ball 15 to the groove 14a.

A rod 17 is incorporated in the housing chamber 16 inside the motor case 11, and one end of the rod 17 is fixed to the end plate 12a, and the other end is fixed to the end plate 12b. A plurality of coil assemblies 20 are arranged outside the rod 17. In the linear motor shown in FIG. 1, 18 coil assemblies 20 are arranged outside the rod 17, and the coil unit 21 is constituted by the coil assembly 20 and the rod 17 as a core member penetrating through the central portion. Is configured. A cylindrical magnet unit 22 is disposed outside the coil assembly 20, and the magnet unit 22 is incorporated in a magnet case 23 as shown in FIG. A slit 24 is formed extending in the longitudinal direction at the center in the width direction of the guide portion 14, and the magnet case 23 is connected to the moving table 13 by a connecting block 25 that passes through the slit 24. This linear motor is configured to drive the moving table by linearly reciprocating the magnet unit 22 outside the coil assembly 20 fixed to the rod 17.

The magnet unit 22 is formed by a plurality of cylindrical permanent magnets 26. Each permanent magnet 26 is magnetized in the axial direction, and the magnet unit 22 is incorporated in the magnet case 23 with the permanent magnets 26 being abutted against each other so that the same poles face each other. Three permanent magnets 26 are incorporated in the magnet case 23, but the number of permanent magnets 26 and the length of the magnet case 23 are not limited to those shown in the figure, and the number of permanent magnets 26 and the number of magnet cases 23 are not limited. The length can be set arbitrarily.

As shown in FIG. 1 (A), the coil unit 21 has six sets and eighteen coil assemblies 20 including three phases of U phase, V phase, and W phase as one set. However, the number of sets is set to an arbitrary number.

As shown in FIG. 7, each coil assembly 20 has a cylindrical bobbin 27. The bobbin 27 includes a cylindrical portion 28 and

flanges

29a and 29b provided at both ends thereof so as to protrude radially outward. Have. A coil 32 formed by winding a magnet wire 31 is provided on the outer peripheral surface of the cylindrical portion 28, and the coil 32 is formed by winding a plurality of layers of the magnet wire 31 around the outer peripheral surface of the cylindrical portion 28.

The inner peripheral surface of the bobbin 27 is provided with three connecting portions 33a to 33c protruding inward in the radial direction at intervals of 120 degrees in the circumferential direction. The connecting portion 33a is a wire pin connecting portion, the connecting portion 33b is a relay connecting portion, the connecting portion 33c is a through connecting portion, and the connecting portions 33a to 33c extend in the axial direction. As shown in FIG. 5A, the rod 17 to which the coil assembly 20 is mounted is formed with three meshing grooves 34 with which the respective connecting portions 33a to 33c are engaged. The solid 20 is prevented from rotating with respect to the rod 17.

A wire connection pin 35a on one end side made of a metal pin is attached to one end of the wire pin coupling portion 33a. The wire connection pin 35a protrudes axially outward from one end surface 29a of the bobbin 27, and one end of a magnet wire 31 forming the coil 32 is connected to the root of the wire connection pin 35a. Similarly, a wire connecting pin 35b on the other end side made of a metal pin is attached to the other end portion of the wire pin connecting portion 33a. The wire connection pin 35b protrudes axially outward from the other end surface 29b of the bobbin 27, and the other end of the magnet wire 31 is connected to the wire connection pin 35b. In this way, both ends of the magnet wire 31 are connected to the wire connection pins 35 a and 35 b that are positioned radially inward with respect to the coil 32 and project from both end faces of the bobbin 27. The wire connection pins 35a and 35b connected to both ends of the magnet wire 31 are straight.

A through hole 36 penetrating in the axial direction is formed in the relay connecting portion 33b. A relay metal fitting 37 made of a hollow metal bar is attached to the through hole 36, and the relay metal fitting 37 constitutes a relay portion that electrically connects the wire connection pins of the other coil assemblies 20. Yes. Fitting

portions

38a and 38b into which wire connecting pins are fitted are provided at both ends of the relay fitting 37, one fitting portion 38a is located in the through hole 36, and the other fitting portion 38b is a bobbin. 27 protrudes outward in the axial direction from the flange 29b.

The end surface of the relay fitting 37 on the fitting portion 38 a side is located at the center of the through hole 36. Further, the central portion of the relay fitting 37 in the axial direction is located on the end face of the flange 29b. However, the central portion in the axial direction of the relay fitting 37 may be located on the end face of the flange 29a. Thus, half of the relay metal fitting 37 in the axial direction is buried in the bobbin 27, and the other half projects from the end face of the bobbin. The through hole 36 is formed such that one inner diameter is slightly larger and the other inner diameter is slightly smaller with the central portion as a boundary, and a step is provided in the central portion. The relay metal fitting 37 is press-fitted from the larger inner diameter and stops at the stepped portion in the center. When the coil assemblies are connected to each other, half of the relay fitting 37 protruding from the end surface of the bobbin in the axial direction enters the through-connecting portion 33 c of the adjacent bobbin 27.

A through hole 39 is formed as a relay portion in the through connecting portion 33c. As described above, the bobbin 27 has the wire pin connecting portion 33a to which the

wire connecting pins

35a and 35b are attached, the relay connecting portion 33b to which the relay metal fitting 37 as the relay portion is attached, and the through hole 39 as the relay portion. The formed through connecting portions 33c are provided at intervals of 120 degrees in the circumferential direction. Therefore, when the coil assemblies 20 that are adjacent in the axial direction are abutted with each other by 120 degrees, the protruding portion of the relay metal fitting 37 is inserted into the through hole 39. The wire connection pin 35b of the adjacent coil assembly 20 is fitted to the fitting portion 38a of the relay fitting 37, and the one coil ahead of the adjacent coil assembly 20 is separated from the fitting portion 38b of the relay fitting 37. The wire connection pin 35a of the assembly 20 is fitted. As a result, the wire connection pins of the coil assembly 20 having the same phase are electrically connected via the relay fitting 37.

That is, the coils 32 of the two coil assemblies 20 are electrically connected across the two coil assemblies 20, and as shown in FIG. 17, a coil having the same phase via the relay fitting 37 of the other bobbin 27 inserted into the through hole 39 of one bobbin 27 of the two bobbins 27 adjacent in the axial direction. The wire connection pins 35a and 35b of the assembly 20 are electrically connected. That is, the V1-phase coil in FIG. 4 is connected to the V2-phase coil via the relay fitting 37 provided between W1 and U2. The U1 phase coil and the W1 phase coil are not shown in FIG. 4, but are the same.

As shown in FIG. 1A, when 18 coil assemblies 20 are arranged in a straight line and the coils 32 are U1, V1, and W1 from the left side in the drawing, coils having the same phase respectively. Are connected via the relay unit.

A common plate 41 is disposed at one end of the rod 17 as shown in FIG. The common plate 41 is formed with a fitting hole into which the wire connection pin 35a of the U1-phase coil assembly 20 adjacent to the common plate 41 is fitted. As shown in FIG. 4, the contact pin 42 fitted to the wire connection pin 35 a is attached to the through coupling portion 33 c, and the relay coupling portion 33 b is fitted to the fitting portion 38 a of the relay metal fitting 37. Contact pins not attached. The common plate 41 is formed with a fitting hole into which each contact pin is fitted, and the wire connection pin 35 a and the two contact pins are electrically connected by a metal fitting provided on the common plate 41. In this way, one ends of the U phase, V phase, and W phase are connected to each other by the conductive common plate to form a star connection. The common plate 41 and the rod 17 are insulated by an insulating plate 43.

An insulating wiring board 44 is disposed at the other end of the rod 17. As shown in FIG. 5B, the wiring board 44 is provided with three

power supply terminals

45u, 45v, and 45w. The wiring board 44 is formed with a fitting hole into which the wire connection pin 35 a of the W6 phase coil assembly 20 adjacent to the wiring board 44 is fitted. As shown in FIG. 4, a contact pin 46 fitted to the wire connection pin 35 b is attached to the through coupling portion 33 c, and the relay coupling portion 33 b is fitted to the fitting portion 38 a of the relay metal fitting 37. Contact pins not attached. The wiring board 44 is formed with a fitting hole into which each contact pin is fitted, and the wire connection pin 35 a and the two contact pins are fed to the wiring board 44 by metal fittings provided on the wiring board 44. Connected to the terminal.

Between the common plate 41 and the coil assembly 20 adjacent thereto, annular spacers 47 that are respectively attached to the wire connection pins 35a and the contact pins 42 are arranged. Similarly, annular spacers that are respectively attached to the wire connection pins 35b and the contact pins 46 are arranged between the wiring board 44 and the coil assembly 20 adjacent thereto.

Under the condition that all the coil assemblies 20 are abutted against each other and are attached to the outside of the rod 17 as shown in FIG. 4, a fixing plate 48 is abutted against the wiring board 44. A nut 49 is screwed to the end of the rod 17. Thereby, the three-phase coil unit 21 is assembled by the plurality of coil assemblies 20 and the rod 17. Further, the coil unit 21 can be easily assembled by abutting the coil assembly 20 between end faces. The coils 32 can be easily connected to each other by fitting the

wire connecting pins

35a and 35b and the relay fitting 37 without soldering the magnet wire 31.

FIG. 8 is a connection diagram of the coil unit 21 shown in FIG. 1 (A), and the coils 32 adjacent in the axial direction have opposite polarities or reverse windings. For example, if the U1 phase coil is forward wound, the adjacent V1 phase coil is reversely wound, and the adjacent W1 phase coil is forward wound.

Therefore, in order to assemble the coil unit 21, first, the coil assembly 20 that becomes the forward winding coil 32 and the coil assembly 20 of the reverse winding coil 32 are manufactured. Next, the forward winding coil assembly 20 and the reverse winding coil assembly 20 are alternately arranged while changing the angle by 120 degrees. For example, as shown in FIG. 1A, 18 coil assemblies 20 are arranged outside the rod 17 in a straight line. At this time, the end surfaces of the bobbins 27 of the two coil assemblies 20 adjacent in the axial direction are abutted against each other. As a result, as shown in the connection diagram of FIG. 8, the wire connection pins 35 a and 35 b of the coil 32 having the same phase mutually jump the two coil assemblies 20 and serve as a relay portion radially inward of the coil 32. Are connected via a relay bracket 37.

As described above, the relay fitting 37 serving as a relay portion for connecting the coils 32 having the same phase is provided on the inner side of the coil 32, so that the relay fitting 37 functioning as a jumper is not disposed outside the coil 32. . As a result, the gap between the outer peripheral surface of the coil and the inner peripheral surface of the permanent magnet 26 can be reduced as much as possible, a strong attractive force can be generated between the coil and the permanent magnet, and a large axial thrust can be generated. It can be added to the moving table 13. In order to supply electric power to each of the three-phase coils, a power supply cable 40 connected to each of the

power supply terminals

45u, 45v, 45w is attached to the wiring board 44 as shown in FIG.

As shown in FIG. 7, three connecting portions 33a to 33c are provided at intervals of 120 degrees in the circumferential direction, and 120 degrees clockwise relative to the wire pin connecting section 33a on which the

wire connecting pins

35a and 35b are provided. A relay connecting portion 33b to which the relay metal fitting 37 is attached is provided at a position separated by a distance. A through-connecting portion 33c in which a through-hole 39 is formed is provided at a position separated by 120 degrees counterclockwise from the wire pin connecting portion 33a. Each of the coil assemblies 20 constituting the coil unit 21 has the same shape of the bobbin 27 before the magnet wire is wound, and all the coil assemblies 20 can be manufactured with one type of bobbin 27. Since the coil wound around the bobbin 27 includes forward winding and reverse winding, there are two types of coil assemblies 20 after the magnet wire 31 is wound. In the illustrated coil assembly 20, the wire connection pins 35a and 35b are linearly attached to the bobbin 27. However, the wire connection pins 35a and 35b may be attached while being shifted in the circumferential direction.

9 is an exploded perspective view showing a part of a coil unit of a linear motor according to another embodiment of the present invention, FIG. 10 is a development view of FIG. 9, and FIG. 11 shows one end of the coil unit. It is sectional drawing. In FIGS. 9 to 11, members that are the same as those described above are given the same reference numerals.

Similar to the coil assembly 20 described above, three coupling portions 50a to 50c are arranged inward in the radial direction inside the bobbin 27 of the coil assembly 30 shown in FIG. 9 at intervals of 120 degrees in the circumferential direction. Protrusively provided. Each of the connecting portions 50a to 50c extends in the axial direction, and through holes 51 to 53 are formed, respectively. The connecting portion 50a is a wire connecting portion, and the other two connecting

portions

50b and 50c are relay connecting portions.

Similar to the coil assembly 20 described above, wire connection pins 54a and 54b made of metal pins are attached to both ends of the wire connecting portion 50a so as to protrude from the end face of the bobbin 27. Both ends of the magnet wire 31 are connected to the root of 54b. Large diameter portions 55 provided at the base end portions of the respective wire connection pins 54a and 54b are fitted into the through holes 51, and insulating members 56 are provided between the respective large diameter portions 55, and the wire connection pins 54a. And the wire connection pin 54b are insulated.

A first relay fitting 57 is attached to the through hole 52 formed in the first connecting portion 50b for relay. The relay fitting 57 has a large-diameter inner fitting portion 57a fitted in the through hole 52 and an outer fitting portion 57b that has a smaller diameter than the inner fitting portion 57a and protrudes to the outside. . A fitting hole 58 into which the wire connection pin 54b or the contact pin 42 is fitted is formed in the inner fitting portion 57a. A second relay fitting 59 is attached to the through hole 53 formed in the second connecting portion 50c for relay. The relay fitting 59 is embedded in the through-hole 53, and

fitting holes

60a and 60b as inner fitting portions are formed at both ends.

Therefore, when the plurality of coil assemblies 30 are arranged outside the rod 17 so that the end faces are abutted against each other, the wire connection pin 54a is fitted into the fitting hole 60b of the second relay fitting 59, and the wire connection pin 54b. Is fitted into the fitting hole 58 of the first relay fitting 57. Further, the outer fitting portion 57b of the first relay fitting 57 is fitted into the fitting hole 60a of the second relay fitting 59, and the wire connection pin 54a is fitted into the fitting hole 60b of the second relay fitting 59. Combined. Thus, the first relay fitting 57 of one coil assembly 30 of the two coil assemblies 30 adjacent to each other in the axial direction, and the second relay of the other coil assembly 30 fitted to the first relay fitting 57. The wire connection pins 54 a and 54 b of the coil assembly 30 having the same phase are electrically connected via the metal fitting 59.

9 and 10, the common plate 41 has a fitting hole 41a into which the wire connection pin 54a of the U1-phase coil assembly 30 adjacent to the common plate 41 is fitted. Contact pins 42 are respectively attached to the fitting holes 58 provided in the relay fitting 57 of the coil assembly 30 and the fitting holes 60 a provided in the relay fitting 59. Fitting

holes

41 b and 41 c into which the respective contact pins 42 are fitted are formed in the common plate 41. With the common plate 41, the wire connection pin 54a and the two contact pins 42 are electrically connected. In this way, one ends of the U phase, V phase, and W phase are connected to each other by the conductive common plate to form a star connection. The common plate 41 and the rod 17 are insulated by an insulating plate 43.

The wiring board 44 includes a fitting hole 44 a into which the wire connection pin 54 b of the W6 phase coil assembly 30 adjacent to the wiring board 44 is fitted, and a fitting hole 44 b into which the outer fitting portion 57 b of the relay fitting 59 is fitted. Is formed. A contact pin 46 is fitted into the fitting hole 60 b provided in the relay fitting 59 of the coil assembly 30, and a fitting hole 44 c into which the contact pin 46 is fitted is formed in the wiring board 44. The wire connection pin 54b, the outer fitting portion 57b, and the contact pin 46 are independently connected to the power supply terminal by three metal fittings provided on the insulating wiring board 44. The connection state of the coils is the same as that shown in FIG.

FIG. 12 is a cross-sectional view showing a modified example of the rod 17. As shown in FIG. 5A, the rod 17 described above is formed with three engagement grooves 34 corresponding to the connecting portions 33a to 33c, whereas the rod 17 shown in FIG. It is almost a triangle.

In each of the

coil assemblies

20 and 30 described above, the connecting portions 33a to 33c (50a to 50c) are provided 120 degrees apart in the circumferential direction. The coils 32 having the same phase are connected to each other through the two relay portions by matching the circumferential angle by shifting by 120 degrees. However, the connecting portions 33a to 33c and the connecting portions 50a to 50c may be provided so as to be gathered around a part of the bobbin 27.

FIG. 13 is a cross-sectional view showing a modified example of the rod 17. The rod 17 has a circular portion 17a and a flat portion 17b in cross-sectional shape, and the three connecting portions 33a to 33c (50a to 50c) are gathered to a part of the bobbin 27 so as to be adjacent to the flat portion. . In order to assemble the coil unit 21 using the

coil assemblies

20 and 30 having such a configuration, three types of coil assemblies 20 in which the positions of the wire connecting pins are made to correspond to the U phase, the V phase, and the W phase, respectively. , 30 and the three types of the

coil assemblies

20, 30 of the forward winding and the reverse winding, respectively. That is, a total of six types of

coil assemblies

20 and 30 are manufactured.

Each coil assembly 20 and coil assembly 30 described above is a three-phase type coil unit, but is not limited to three phases, and may be a multi-phase coil unit such as two-phase or five-phase. In the case of two phases, the bobbin 27 is provided with a wire connecting pin and one relay portion, for example, shifted by 180 degrees in the circumferential direction. In the case of five phases, the bobbin 27 is provided with wire connection pins and four relay portions, for example, shifted by 72 degrees in the circumferential direction.

The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the invention. For example, the above-described linear motor moves the magnet unit 22 relative to the coil unit 21, but the magnet unit is fixed to the motor case 11, and the rod 17 to which the coil unit 21 is attached is reciprocated in the axial direction. You may make it let it. In that case, both ends of the rod 17 are supported by a bearing so as to be reciprocally movable.

This linear motor is used to reciprocate the moving table in a straight line and move the members arranged on the moving table.

Claims

A linear motor having a rod to which a plurality of coil assemblies are fixed on the outside and a permanent magnet disposed on the outside of the coil assembly, and reciprocating one of the rod and the permanent magnet in the axial direction. And
Each of the coil assemblies is
A cylindrical bobbin provided with a coil formed by winding a magnet wire and disposed outside the rod;
A wire connection pin on one end side provided on one end surface of the bobbin and positioned on the radially inner side of the coil, to which one end of the magnet wire is connected;
A wire connecting pin on the other end side provided on the other end surface of the bobbin and positioned on the radially inner side of the coil and connected to the other end of the magnet wire;
A relay portion provided on the bobbin inwardly in the radial direction of the coil;
The wire connection pin of each coil assembly is connected to the wire connection pin of the other coil assembly of the same phase via the relay portion of the coil assembly of at least one other phase. A linear motor characterized by
2. The linear motor according to claim 1, wherein a plurality of relay portions are provided on the bobbin.
3. The linear motor according to claim 1, wherein the relay portion is disposed in a through-hole formed in the bobbin, and a relay fitting that electrically connects the wire connection pins of the coil assembly in the same phase. A linear motor comprising:
3. The linear motor according to claim 2, wherein the relay portion includes a through hole formed in the bobbin and a through hole to which a relay metal fitting having fitting portions provided at both ends is fixed. Of the two bobbins adjacent to each other in the axial direction under the state where the coil assembly is disposed, the same phase is obtained via the relay fitting of the other bobbin inserted into the through hole of the one bobbin. A linear motor characterized by electrically connecting the wire connection pins of the coil assembly.
The linear motor according to claim 2, wherein the relay portion is disposed in a through hole formed in the bobbin, and an inner fitting portion located inside the through hole and an outer fitting portion protruding from an end surface of the bobbin. A first relay fitting having a plurality of coil assemblies, and a second relay fitting having inner fitting portions provided at both ends inside the through-holes, respectively. In the two phases of the bobbins adjacent in the axial direction, the first relay fitting of one of the bobbins and the second relay fitting of the other bobbin fitted thereto are in the same phase. A linear motor characterized by electrically connecting the wire connection pins of a coil assembly.
6. The linear motor according to claim 1, wherein the one end side wire connection pin and the other end side wire connection pin are formed in a straight line on the bobbin.
7. The linear motor according to claim 1, wherein a common connection plate connected to all phase coils is disposed on one end side of the rod, and power is supplied to each phase coil on the other end side. A linear motor comprising a wiring board to which terminals are connected.