Stator and cylindrical linear motor

Abstract

The present invention provides a cylindrical linear motor and its stator that suppress performance degradation caused by magnetic flux leakage and enable higher efficiency than conventional models. [Solution] The device comprises a long cylindrical yoke 110 and a coil group 120 consisting of a plurality of short cylindrical coils 121 arranged axially on the inner diameter side of the yoke 110. The yoke 110 has a first yoke portion 111 having an opening 111b cut out in a part of the circumferential region from one end to the other along the axial direction, and a second yoke portion 112 configured to match the shape of the opening 111b and provided with a plurality of holes 112b through which the respective lead wires 122 of the plurality of coils 121 pass. The second yoke portion 112 is fixed to the opening 111b of the first yoke portion 111 with the respective lead wires 122 of the plurality of coils 121 passed through each of the plurality of holes 112b.

Description

Technical Field

[0005] , ,

[0001] The present invention relates to a stator of a tubular linear motor and a tubular linear motor, and particularly to a stator of a tubular linear motor and a tubular linear motor in which leakage magnetic flux is reduced.

Background Art

[0002] In a tubular linear motor, there is one that includes a long tubular yoke and a coil group composed of a plurality of coils each having a short tubular shape and arranged along the axial direction on the inner diameter side of the yoke as a stator. In this type of tubular linear motor, the plurality of coils included in the coil group are assigned to a plurality of different phases, and the coils of the same phase at separated positions among the plurality of different phases are connected to each other by jumper wires.

[0003] The coil group is provided with lead-out wires for use as jumper wires when connecting the coils of each phase. For this reason, there is a problem that the coil group having the lead-out wires cannot be directly inserted into the tubular yoke. Regarding the problem of the jumper wires in this type of linear motor, an improvement plan has been proposed in Patent Document 1.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In Patent Document 1, the jumper wires connecting the plurality of coils are not led out outside the yoke but are passed between the coils and the yoke. In this case, insertion of the coil group into the inside of the tubular yoke and connection of the jumper wires can be easily performed. However, a gap for passing the jumper wires is required between the coil and the yoke. For this reason, there is a problem that the performance of the motor deteriorates.

[0006] On the other hand, by cutting a portion of the cylindrical yoke axially from one end to the other, creating a C-shaped cross-section, it becomes easier to insert the coil group with lead wires into the cylindrical yoke and connect the jumper wires. In this case, however, magnetic flux from the coils and the movable magnets leak from the cut-out portion of the cylindrical yoke, reducing the efficiency of the linear motor and causing various problems such as reduced thrust and cogging. Therefore, in cylindrical linear motors that require lead wires for multiple coils, there has been a desire to realize a cylindrical linear motor that can suppress performance degradation caused by magnetic flux leakage.

[0007] The present invention aims to provide a stator for a cylindrical linear motor and a cylindrical linear motor that can suppress performance degradation caused by magnetic flux leakage in a cylindrical linear motor that requires lead wires to multiple coils. [Means for solving the problem]

[0008] The stator of the cylindrical linear motor according to this invention comprises a long cylindrical yoke and a coil group consisting of a plurality of short cylindrical coils arranged axially on the inner diameter side of the yoke. The yoke has a first yoke portion having an opening cut out in a part of the circumferential region from one end to the other along the axial direction, and a second yoke portion configured to match the shape of the opening and provided with a plurality of holes through which the lead wires of the plurality of coils pass. The second yoke portion is fixed to the opening of the first yoke portion with the lead wires of the plurality of coils passing through each of the plurality of holes.

[0009] In the stator of the cylindrical linear motor according to this invention, the coil group may be press-fitted into the first yoke portion such that the lead wires of each of the multiple coils are located at the opening.

[0010] In the stator of the cylindrical linear motor according to this invention, a plurality of coils are assigned to a plurality of different phases, and the respective lead wires passing through the respective holes of each coil of the same phase located at different positions among the plurality of different phases may be connected to each other as jumper wires.

[0011] The cylindrical linear motor according to this invention comprises a stator having a long cylindrical yoke and a group of coils, each being a short cylindrical shape and arranged axially on the inner diameter side of the yoke; and a movable element having a magnet positioned inside the stator, facing it via a magnetic gap and movable in the axial direction. The yoke has a first yoke portion having an opening cut out in a part of its circumferential region from one end to the other along the axial direction, and a second yoke portion configured to match the shape of the opening and provided with a plurality of holes through which the lead wires of each coil group pass. The second yoke portion is fixed to the opening of the first yoke portion with the lead wires of each coil passing through each of the plurality of holes.

[0012] In the cylindrical linear motor according to this invention, the coil group may be press-fitted into the first yoke portion such that the lead wires of each of the multiple coils are located at the opening.

[0013] In the cylindrical linear motor according to this invention, a plurality of coils are assigned to a plurality of different phases, and the respective lead wires passing through the respective holes of each coil of the same phase located at different positions among the plurality of different phases may be connected to each other as jumper wires. [Effects of the Invention]

[0014] In this invention, in the stator of a cylindrical linear motor, a group of coils having lead wires is inserted into a first yoke section that uses an opening, and the second yoke section is fixed to the opening of the first yoke section with the lead wires of each of the multiple coils passing through each of the multiple holes. Therefore, in a cylindrical linear motor that requires lead wires for multiple coils, it is possible to suppress the deterioration of performance caused by magnetic flux leakage. [Brief explanation of the drawing]

[0015] [Figure 1] It is an exploded perspective view showing the stator of the tubular linear motor in Embodiment 1 in an exploded state. [Figure 2] It is an exploded perspective view showing the yoke of the stator of the tubular linear motor in Embodiment 1 in an exploded state. [Figure 3] It is a perspective view showing the stator of the tubular linear motor in Embodiment 1. [Figure 4] It is a cross-sectional view showing the cross-sectional configuration of the stator of the tubular linear motor in Embodiment 1 together with lead lines. [Figure 5] It is a perspective view showing another example of the stator of the tubular linear motor in Embodiment 1. [Figure 6] It is a perspective view showing another example of the stator of the tubular linear motor in Embodiment 1 together with a crossing line. [Figure 7] It is a cross-sectional view showing the cross-sectional configuration of the stator of the tubular linear motor in Embodiment 1 together with lead lines. [Figure 8] It is a cross-sectional view showing the cross-sectional configuration of the tubular linear motor in Embodiment 1. [Figure 9] It is a perspective view showing the stator of the tubular linear motor in Comparative Example 1. [Figure 10] It is a perspective view showing the stator of the tubular linear motor in Comparative Example 2.

Mode for Carrying Out the Invention

[0016] Hereinafter, embodiments of the tubular linear motor and its stator of the present invention will be described with reference to the drawings. In each figure, the same parts are denoted by the same reference numerals.

[0017] Embodiment 1. First, the basic overall configuration of the stator 100 used in the tubular linear motor 10 in Embodiment 1 will be described with reference to FIGS. 1 to 7. FIG. 1 is an exploded perspective view showing the stator 100 of the cylindrical linear motor 10 in Embodiment 1 in an exploded state. FIG. 2 is an exploded perspective view showing the yoke of the stator 100 of the cylindrical linear motor 10 in Embodiment 1 in an exploded state. FIG. 3 is a perspective view showing the stator 100 of the cylindrical linear motor 10 in Embodiment 1. FIG. 4 is a cross-sectional view showing the cross-sectional configuration of the stator 100 of the cylindrical linear motor 10 in Embodiment 1 together with leader lines. FIG. 5 is a perspective view showing another example of the stator 100 of the cylindrical linear motor 10 in Embodiment 1. FIG. 6 is a perspective view showing another example of the stator 100 of the cylindrical linear motor 10 in Embodiment 1 together with a passing line. FIG. 7 is a cross-sectional view showing the cross-sectional configuration of the stator 100 of the cylindrical linear motor 10 in Embodiment 1 together with leader lines.

[0018] [Configuration of Stator 100] The stator 100 of the cylindrical linear motor 10 in Embodiment 1 mainly includes a yoke 110 and a coil group 120. The yoke 110 is a magnetic path configured in a long cylindrical shape by a first yoke portion 111 and a second yoke portion 112. The coil group 120 is composed of a plurality of coils 121 each having a short cylindrical shape and arranged along the axial direction on the inner diameter side of the yoke 110. Here, the direction along the axis of the cylinder constituting the yoke 110 is defined as the axial direction. Note that the yoke 110 and the coil group 120 are configured in a cylindrical shape, either a circular cylinder or a rectangular cylinder. It is desirable that the coil group 120 be arranged so as to closely adhere to the inner cylindrical surface on the inner diameter side of the yoke 110 with as little gap as possible.

[0019] The first yoke portion 111 has an opening 111b in which a part of the circumferential region is cut out from one end to the other end along the axial direction. The second yoke portion 112 is configured to match the shape of the opening 111b. The second yoke portion 112 is provided with a plurality of holes 112b for passing the respective lead wires 122 of the plurality of coils 121 constituting the coil group 120.

[0020] The coil group 120 consists of multiple coils 121, each assigned to a different phase. As an example, as shown in Figure 7, there are three sets of coils 121 corresponding to the U, V, and W phases of a three-phase AC system. Lead wires 122 are drawn from both ends of each of the multiple coils 121. In Figure 7, the letters u, v, and w following the reference numeral 121 represent the phase, and the numbers 1, 2, and 3 at the end indicate which coil it is for each phase.

[0021] [Assembly of stator 100] The assembly process for the stator 100 will be explained below in two steps: Step 1 and Step 2. Step 1: As shown by the dashed line A in Figure 1, the coil group 120 is inserted into the first yoke portion 111 with the lead wires 122 of each of the coils 121 constituting the coil group 120 aligned so that they are located at the opening 111b. It is preferable that the coil group 120 be inserted into the first yoke portion 111 by press-fitting. Here, by passing the lead wires 122 of the coil group 120 through the opening 111b of the first yoke portion 111, the coil group 120 can be easily press-fitted into the first yoke portion 111. Figure 2 shows the state after the work of inserting the coil group 120 into the first yoke portion 111 has been completed.

[0022] Step 2: When inserting the second yoke portion 112 into the opening 111b of the first yoke portion 111, as shown by the dashed line B in Figure 1, the lead wires 122 of each of the multiple coils 121 are passed through each of the multiple holes 112b of the second yoke portion 112, as shown in Figures 2 to 4. Two lead wires 122 from adjacent coils 121 are drawn out through each of the holes 112b. Then, the second yoke portion 112 is fixed to the opening 111b of the first yoke portion 111. The second yoke portion 112 can be fixed to the opening 111b of the first yoke portion 111 by fitting or by adhesive.

[0023] When the second yoke portion 112 is fixed to the opening 111b of the first yoke portion 111, a cylindrical yoke 110 without any missing parts is formed. As a result, the magnetic flux generated by the coil group 120 is less likely to leak out of the yoke 110. Furthermore, by configuring the second yoke portion 112 to be fixed to the opening 111b of the first yoke portion 111, the insertion of the coil group 120 into the first yoke portion 111 having the opening 111b becomes easier, and the assembly of the cylindrical yoke 110 without any defects becomes easier.

[0024] As shown in Figure 5, in the second yoke section 112, which is provided with two holes 112b1 and 112b2 for two lead wires 122 from an adjacent coil 121, the two lead wires 122 from the adjacent coil 121 may be drawn out from other holes 112b1 and 112b2.

[0025] [Coil connection] As shown in Figure 7, a specific example is provided in which three sets of coils 121 are provided, each consisting of U-phase, V-phase, and W-phase coils 121 corresponding to three-phase AC. The three sets of three-phase coils 121 are provided as 121u1, 121v1, 121w1, 121u2, 121v2, 121w2, 121u3, 121v3, and 121w3.

[0026] The U-phase coils 121u1, 121u2, and 121u3, located at different distances from each other, are connected by a jumper wire 122b. Similarly, the V-phase coils 121v1, 121v2, and 121v3, located at different distances from each other, are connected by a jumper wire 122b. Furthermore, the W-phase coils 121w1, 121w2, and 121w3, located at different distances from each other, are connected by a jumper wire 122b. In other words, the respective lead wires 122 passing through the respective holes 112b of each coil 121 of the same phase located at different positions among multiple different phases are connected to each other as jumper wires 122b, as shown in Figures 6 and 7. The jumper wires 122b can be connected using the lead wires 122 as they are, but if the lead wires 122 alone are insufficient, connecting lead wires may be added.

[0027] The drive currents Iu, Iv, and Iw for the U, V, and W phases are supplied to the current supply lines 122a at both ends of coil 121. The drive current Iu flows through the U-phase coils 121u1, 121u2, and 121u3 connected by the jumper wire 122b. The drive current Iv flows through the V-phase coils 121v1, 121v2, and 121v3 connected by the jumper wire 122b. The drive current Iw flows through the W-phase coils 121w1, 121w2, and 121w3 connected by the jumper wire 122b. If the drive currents Iu, Iv, and Iw for the U, V, and W phases are three-phase alternating current, a moving magnetic field is generated in the multiple coils 121 within the coil group 120.

[0028] [Cylindrical Linear Motor 10] The configuration of the cylindrical linear motor 10 using the stator 100 in Embodiment 1 will be described below with reference to Figure 8. Figure 8 is a cross-sectional view showing the cross-sectional configuration of the cylindrical linear motor 10 in Embodiment 1. In Figure 8, the same reference numerals are used for parts that are the same as those in Figures 1 to 7, and redundant explanations will be omitted, with the focus being on the different parts.

[0029] The cylindrical linear motor 10 mainly comprises a stator 100 and a movable element 200. The stator 100 generates a moving magnetic field internally in response to externally supplied drive currents Iu, Iv, and Iw. The movable element 200 is configured to have a magnetic material that is movable in the axial direction and is configured to move in the axial direction in response to the moving magnetic field.

[0030] The stator 100 mainly comprises a yoke 110, a cylindrical section 140, and a cylindrical section 150. The cylindrical portion 140 is configured to have the same shape and diameter as the yoke 110 and is attached to one end of the yoke 110. A shaft retaining portion 141 is provided at the tip of the cylindrical portion 140. The shaft retaining portion 141 is provided to support the movable shaft 240 which is attached to one end of the movable element 200. The cylindrical portion 150 is located at the other end of the yoke 110 and has the same shape and diameter as the yoke 110. A shaft retaining portion 151 is provided at the tip of the cylindrical portion 150. The shaft retaining portion 151 is provided to support the movable shaft 250 which is located at the other end of the movable element 200.

[0031] The movable element 200 comprises a plurality of magnets 210 and a plurality of pole pieces 220. The movable element 200 is composed of a movable magnet section 201, a movable shaft 240, and a movable shaft 250. The movable magnet section 201 is composed of a plurality of magnets 210 and a plurality of pole pieces 220 arranged alternately in the axial direction. The movable magnet section 201 has an outer diameter close to the inner diameter of the coil group 120, and is configured as either a cylindrical or rectangular columnar shape to match the cross-sectional shape of the coil group 120 so as not to contact the inner circumferential surface of the coil group 120. The multiple magnets 210 are permanent magnets that are magnetized in the axial direction and arranged so that their magnetic poles alternately reverse. The pole piece 220 is a soft magnetic material that directs the magnetic field generated by the magnets 210.

[0032] The movable shaft 240 is connected to one end of the movable magnet section 201 and transmits the movement of the movable magnet section 201 to the outside while being supported by the shaft retaining section 141. Similarly, the movable shaft 250 is connected to the other end of the movable magnet section 201 and transmits the movement of the movable magnet section 201 to the outside while being supported by the shaft retaining section 151. Since the second yoke portion 112 is fixed to the opening 111b of the first yoke portion 111, the yoke 110 is cylindrical without any gaps. Therefore, the magnetic flux from the coil group 120 and the magnetic flux from the magnet 210 do not leak to the outside. As a result, it is possible to suppress the performance degradation caused by magnetic flux leakage in the cylindrical linear motor 10. Furthermore, by configuring the second yoke portion 112 to be fixed to the opening 111b of the first yoke portion 111, it becomes easier to insert the coil group 120 into the first yoke portion 111 which has the opening 111b, and it also becomes easier to assemble the cylindrical yoke 110 without any defects.

[0033] Comparative Example 1. The yoke 110A of the stator 100A of Comparative Example 1, which does not have the features of Embodiment 1, will be described with reference to Figure 9. Figure 9 is a perspective view showing the stator 100A of the cylindrical linear motor in Comparative Example 1. In Figure 9, the same reference numerals are used for parts that are the same as in Figures 1 to 8, and redundant explanations are omitted, with the focus being on the different parts. Figure 9 corresponds to Figure 3 of Embodiment 1 and shows the state just before the work of inserting the coil group 120 into the yoke 110A is completed and the lead wire 122 is connected as a jumper wire.

[0034] The yoke 110A of Comparative Example 1 has an opening 110Ab in which a portion of the circumferential region is cut out along the axial direction from one end to the other. Because this yoke 110A has an opening 110Ab, it becomes easy to insert the coil group 120 having the lead wires 122 into the yoke 110A and to connect the jumper wires. However, the opening 110Ab in the yoke 110A remains open and is not sealed. As a result, magnetic flux from the coil group 120 and magnetic flux from the magnets of the movable element leak out from the opening 110Ab of the yoke 110A. Consequently, the efficiency of the cylindrical linear motor of Comparative Example 1 decreases compared to the cylindrical linear motor 10 of Embodiment 1, leading to various problems such as reduced thrust and cogging.

[0035] [Comparative Example 2] The yoke 110B in the stator 100B of Comparative Example 2, which does not have the features of Embodiment 1, will be described with reference to Figure 10. Figure 10 is a perspective view showing the stator 100B of the cylindrical linear motor in Comparative Example 2. In Figure 10, the same parts as in Figures 1 to 8 are denoted by the same reference numerals, redundant explanations are omitted, and the explanation will focus on the different parts. Figure 10 corresponds to Figure 6 of Embodiment 1 and shows the state after the work of inserting the coil group 120 into the yoke 110B has been completed and the lead wires have been connected as jumper wires.

[0036] The yoke 110B of Comparative Example 2 has a cylindrical main yoke portion 110B1 having a C-shaped cross-section due to an opening cut out in a part of the circumferential region from one end to the other along the axial direction, and a cylindrical auxiliary yoke portion 110B2 having a U-shaped cross-section and being smaller than the main yoke portion 110B1, with the openings of the main yoke portion 110B1 and the auxiliary yoke portion 110B2 joined together. In this yoke 110B, a space is formed by the auxiliary yoke portion 110B2 near the opening of the main yoke portion 110B1, making it easy to insert the coil group 120 with lead wires into the main yoke portion 110B1. Note that the cross-sectional shape of the auxiliary yoke portion 110B2 may be a V-shape, C-shape, semicircular shape, or U-shape with an opening, in addition to a U-shape. However, magnetic flux from the coil group 120 and the movable element magnet leaks from the opening of the main yoke section 110B1 into the space of the auxiliary yoke section 110B2. As a result, although the yoke 110B of the stator 100B of Comparative Example 2 leaks less magnetic flux than that of Comparative Example 1, it leaks more magnetic flux than the yoke 110 of Embodiment 1. In other words, compared to the cylindrical linear motor 10 of Embodiment 1, the cylindrical linear motor of Comparative Example 2 suffers from reduced efficiency, reduced thrust, and various problems such as cogging. Furthermore, the yoke 110B has the problem of being larger because it uses both the main yoke section 110B1 and the auxiliary yoke section 110B2. In addition, the troublesome work of joining the main yoke section 110B1 and the auxiliary yoke section 110B2 is required.

[0037] [Effects of Embodiment 1] The stator 100 of the cylindrical linear motor 10 of Embodiment 1, and the cylindrical linear motor 10 using the stator 100, can provide the following effects.

[0038] The stator 100 of the cylindrical linear motor 10 of Embodiment 1 includes a long cylindrical yoke 110 and a coil group 120 composed of a plurality of short cylindrical coils 121 arranged axially on the inner diameter side of the yoke 110. The yoke 110 has a first yoke portion 111 having an opening 111b cut out in a part of the circumferential region from one end to the other along the axial direction, and a second yoke portion 112 configured to match the shape of the opening 111b and provided with a plurality of holes 112b through which the respective lead wires 122 of the plurality of coils 121 pass. Here, the second yoke portion 112 is fixed to the opening 111b of the first yoke portion 111 with the respective lead wires 122 of the plurality of coils 121 passed through each of the plurality of holes 112b. As a result, in the stator 100 of the cylindrical linear motor 10, a group of coils 120 having lead wires 122 is inserted into a first yoke section 111 using an opening 111b, and the second yoke section 112 is fixed to the opening of the first yoke section with the lead wires of each of the multiple coils passing through each of the multiple holes 112b. Therefore, in the stator 100 of the cylindrical linear motor 10, which requires lead wires 122 for multiple coils 121, it becomes possible to suppress the performance degradation caused by magnetic flux leakage through the yoke 110.

[0039] In the stator 100 of the cylindrical linear motor 10 of Embodiment 1, the coil group 120 is press-fitted into the first yoke portion 111 such that the lead wires 122 of each of the multiple coils 121 are located at the opening 111b. Therefore, with multiple lead wires 122 passing through multiple holes 112b in the second yoke portion 112, the coil group 120 is in close contact with the yoke 110. As a result, a magnetically highly efficient stator 100 can be realized.

[0040] In the stator 100 of the cylindrical linear motor 10 of Embodiment 1, a plurality of coils 121 are assigned to a plurality of different phases, and each lead wire 122 passing through each hole 112b of each coil 121 of the same phase located at a distance from each other among the plurality of different phases is interconnected as a jumper wire 122b. By connecting the jumper wire 122b in this manner, a moving magnetic field can be generated inside the coil group 120 in response to the multi-phase drive current supplied from the outside.

[0041] The cylindrical linear motor 10 of Embodiment 1 includes a stator 100 having a long cylindrical yoke 110, a coil group 120 composed of a plurality of short cylindrical coils 121 arranged axially on the inner diameter side of the yoke 110, and a movable element 200 having magnets 210 arranged axially movable opposite to the stator 100 with a magnetic gap between them. The yoke 110 has a first yoke portion 111 having an opening 111b cut out in a part of the circumferential region from one end to the other along the axial direction, and a second yoke portion 112 configured to match the shape of the opening 111b and provided with a plurality of holes 112b through which the respective lead wires 122 of the plurality of coils 121 pass. Here, the second yoke portion 112 is fixed to the opening 111b of the first yoke portion 111 with the respective lead wires 122 of the plurality of coils 121 passed through each of the plurality of holes 112b. As a result, in the cylindrical linear motor 10, a group of coils 120 having lead wires 122 is inserted into a first yoke section 111 using an opening 111b, and the second yoke section 112 is fixed to the opening of the first yoke section with the lead wires of each of the multiple coils passing through each of the multiple holes 112b. Therefore, in a cylindrical linear motor 10 that requires lead wires 122 for multiple coils 121, it becomes possible to suppress the deterioration of performance caused by leakage of magnetic flux through the yoke 110.

[0042] In the cylindrical linear motor 10 of Embodiment 1, the coil group 120 is press-fitted into the first yoke portion 111 such that the lead wires 122 of each of the multiple coils 121 are located at the opening 111b. Therefore, with multiple lead wires 122 passing through multiple holes 112b in the second yoke portion 112, the coil group 120 is in close contact with the yoke 110. As a result, a cylindrical linear motor 10 equipped with a magnetically efficient stator 100 can be realized.

[0043] In the cylindrical linear motor 10 of Embodiment 1, a plurality of coils 121 are assigned to a plurality of different phases, and each lead wire 122 passing through each hole 112b in each coil 121 of the same phase located at a distance from each other among the plurality of different phases is connected to each other as a jumper wire 122b. By connecting the jumper wire 122b in this manner, a moving magnetic field is generated inside the coil group 120 in response to the multi-phase drive current supplied from the outside, making it possible to realize a cylindrical linear motor 10 equipped with a magnetically efficient stator 100.

[0044] [Other effects] By making the yoke 110 a divided structure consisting of a first yoke section 111 and a second yoke section 112, it becomes easier to apply insulating coating or other processing to the inner surfaces of the first yoke section 111 and the second yoke section 112 before inserting the coil group 120 into the first yoke section 111. [Explanation of Symbols]

[0045] 10 Cylindrical linear motor, 100 Stator, 110 Yoke, 111 First yoke section, 111b Opening, 112 Second yoke section, 112b, 112b1, 112b2 Holes, 120 Coil group, 121 Coil, 122 Lead wire, 122a Current supply wire, 122b Jumper wire, 140 Cylindrical section, 141 Shaft retainer section, 150 Cylindrical section, 151 Shaft retainer section, 200 Movable element, 201 Movable magnet section, 210 Magnet, 220 Pole piece, 240, 250 Movable shaft.

Claims

1. A long, cylindrical yoke (110), The device comprises a coil group (120) consisting of a plurality of coils (121) that are each short cylindrical in shape and arranged axially on the inner diameter side of the yoke (110), The aforementioned yoke (110) is A first yoke portion (111) having an opening (111b) in which a portion of the circumferential region is cut out along the axial direction from one end to the other, The second yoke portion (112) is configured to conform to the shape of the opening (111b) and has a plurality of holes (112b) through which the lead wires (122) of each of the plurality of coils (121) pass, The second yoke portion (112) is fixed to the opening (111b) of the first yoke portion (111) with the respective lead wires (122) of the plurality of coils (121) passing through each of the plurality of holes (112b). Stator of a cylindrical linear motor.

2. The coil group (120) is press-fitted into the first yoke portion (111) such that the lead wires (122) of each of the plurality of coils (121) are positioned in the opening (111b). A stator for a cylindrical linear motor according to claim 1.

3. The aforementioned multiple coils (121) are assigned to multiple different phases, Each of the lead wires (122) passing through each of the holes (112b) in each of the coils (121) of the same phase located at a distance from each of the plurality of different phases are connected to each other as jumper wires (122b). A stator for a cylindrical linear motor according to claim 1 or claim 2.

4. A stator (100) having a long cylindrical yoke (110) and a coil group (120) composed of a plurality of short cylindrical coils (121) arranged axially on the inner diameter side of the yoke (110), The system comprises a movable element (200) having a magnet (210) positioned inside the stator (100) facing it via a magnetic gap and movable in the axial direction, The aforementioned yoke (110) is A first yoke portion (111) having an opening (111b) in which a portion of the circumferential region is cut out along the axial direction from one end to the other, The second yoke portion (112) is configured to match the shape of the opening (111b) and has a plurality of holes (112b) through which each of the lead wires (122) of the coil group (120) passes, The second yoke portion (112) is fixed to the opening (111b) of the first yoke portion (111) with the respective lead wires (122) of the plurality of coils (121) passing through each of the plurality of holes (112b). Cylindrical linear motor.

5. The coil group (120) is press-fitted into the first yoke portion (111) such that the lead wires (122) of each of the plurality of coils (121) are positioned in the opening (111b). The cylindrical linear motor according to claim 4.

6. The aforementioned multiple coils (121) are assigned to multiple different phases, Each of the lead wires (122) passing through each of the holes (112b) in each of the coils (121) of the same phase located at a distance from each of the plurality of different phases are connected to each other as jumper wires (122b). A cylindrical linear motor according to claim 4 or claim 5.

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