Linear motor

Abstract

The linear motor includes a primary armature and secondary magnetic poles. The armature module (1) includes a laminated core having a core back portion and a teeth group (21) consisting of a plurality of teeth portions (21a, 21b), a coil group (3), an electric circuit connection portion (4), and a wiring structure portion (5). The teeth group (21) includes an end teeth group (210) consisting of a group of teeth portions (21a) and a central teeth group (211) consisting of a group of teeth portions (21b). The electrical circuit connection portion (4) is arranged in a space formed by the difference between the length of the tooth portion (21a) of the end tooth group (210) in the stacking thickness direction of the laminated core and the length of the tooth portion (21b) of the central tooth group (211) in the stacking thickness direction of the laminated core, and at least a portion of it is arranged inside the actual outer shape (7) which is a rectangular parallelepiped that includes the outer shape of the armature module (1) excluding the electrical circuit connection portion (4).

Description

[Technical Field]

[0001] The present disclosure relates to a linear motor. [Background technology]

[0002] Conventionally, a linear motor including a primary armature and secondary magnetic poles has been known. The primary armature is movable relative to the secondary magnetic poles in the direction of travel. For example, Patent Document 1 discloses a moving magnet linear motor including an armature as a stator and a mover including a permanent magnet and a magnetic yoke. The armature is composed of multiple armature blocks. The armature blocks include a laminated core, an armature coil, and a connector. The laminated core includes multiple teeth. The multiple teeth are spaced apart along the direction of travel of the mover and extend toward the mover. All of the teeth are formed with the same length. Armature coils are wound around the teeth. Connectors are disposed on both ends of the laminated core in the direction of travel of the mover to electrically connect adjacent electronic blocks in the direction of travel. The connectors protrude from both side surfaces of the laminated core perpendicular to the direction of travel of the mover. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-23954 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the technology disclosed in Patent Document 1, if a rectangular parallelepiped that includes the other parts of the armature block excluding the connector is used as the actual outer shape, and the rectangular parallelepiped of the armature block including the connector is used as the inclusive outer shape, the connector is placed outside the actual outer shape, which increases the volume of the inclusive outer shape and may result in a decrease in thrust force relative to the inclusive outer shape.

[0005] The present disclosure has been made in consideration of the above, and aims to provide a linear motor that can suppress an increase in the volume of the overall outline of the armature module and can increase the thrust force relative to the overall outline. [Means for solving the problem]

[0006] To solve the above-mentioned problems and achieve the object, a linear motor according to the present disclosure includes a primary armature having at least one armature module, and a secondary magnetic pole facing the primary armature and separated by a predetermined magnetic gap. The armature module includes a laminated core having a core back portion extending in the direction of travel of the primary armature and a teeth group consisting of a plurality of teeth arranged in parallel along the direction of travel of the primary armature and extending from the core back portion toward the secondary magnetic pole, a coil group consisting of a plurality of coils wound around each tooth of the teeth group, an electric circuit connection portion arranged at an end of the teeth group in the thickness direction of the laminated core and connecting adjacent armature modules in the direction of travel of the primary armature, and a wiring structure portion electrically connecting the coil group and the electric circuit connection portion. The teeth groups include end teeth groups consisting of a group of one or more teeth located on both sides of the primary armature in the direction of travel, and a central teeth group consisting of a group of one or more teeth excluding the end teeth groups. At least one of the end teeth groups and the central teeth group has two or more consecutive teeth arranged along the direction of travel of the primary armature. Of the teeth groups in the end teeth group, the length of the teeth group that is longest in the stacking thickness direction of the laminated core is shorter than the length of the teeth group in the central teeth group that is longest in the stacking thickness direction of the laminated core. The length of the secondary pole in the thickness direction of the laminated core is greater than the length of the tooth portion of the end teeth group that has the shortest length in the thickness direction of the laminated core.The electrical circuit connection portion is located on one or both ends of the end teeth group in the stacking thickness direction of the laminated core, in a space formed by the difference between the length of the tooth portion of the end teeth group in the stacking thickness direction of the laminated core and the length of the tooth portion of the central teeth group in the stacking thickness direction of the laminated core, and at least a portion of it is located inside the actual outer shape which is a rectangular parallelepiped that includes the outer shape of the armature module excluding the electrical circuit connection portion. [Effects of the Invention]

[0007] The linear motor according to the present disclosure has the advantage that it is possible to suppress an increase in the volume of the overall outline of the armature module and to increase the thrust force relative to the overall outline. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a linear motor according to a first embodiment; [Figure 2] 1 is a cross-sectional view showing a linear motor according to a first embodiment; [Figure 3] FIG. 1 is a perspective view of an armature module of a linear motor according to a first embodiment, showing a state in which a fixing member is removed; [Figure 4] 1 is a bottom view of an armature module of a linear motor according to a first embodiment, showing a state in which a fixing member is removed; FIG. [Figure 5] FIG. 1 is a perspective view of a linear motor according to a first embodiment, showing a state in which a fixing member of an armature module, an electric circuit connection portion, and a wiring structure portion are removed; [Figure 6] FIG. 1 is a perspective view showing a linear motor of a comparative example; [Figure 7] FIG. 10 is a bottom view of an armature module of a linear motor according to a comparative example, showing a state in which a fixing member has been removed. [Figure 8] A graph showing the relationship between the length of the secondary magnetic pole in the lamination thickness direction of the laminated core, the length of the end teeth group, and the length of the center teeth group, and the thrust force. [Figure 9] A graph showing the relationship between the length of the secondary magnetic pole in the lamination thickness direction of the laminated core, the length of the end teeth group, and the length of the center teeth group, and the cogging thrust. [Figure 10] FIG. 10 is a perspective view showing a linear motor according to a second embodiment; [Figure 11] FIG. 10 is a perspective view showing an armature module of a linear motor according to a second embodiment, with a fixing member removed; [Figure 12] FIG. 10 is a bottom view of the armature module of the linear motor according to the second embodiment, showing a state in which a fixing member is removed. [Figure 13] FIG. 10 is a perspective view showing a linear motor according to a third embodiment; [Figure 14] FIG. 11 is a perspective view showing an armature module of a linear motor according to a third embodiment, with a fixing member removed; [Figure 15] FIG. 10 is a bottom view of the armature module of the linear motor according to the third embodiment, showing a state in which a fixing member is removed. [Figure 16] FIG. 10 is a cross-sectional view showing a linear motor according to a fourth embodiment. [Figure 17] FIG. 10 is a bottom view of the armature module of the linear motor according to the fourth embodiment, showing a state in which a fixing member is removed. [Figure 18] FIG. 10 is a cross-sectional view showing a linear motor according to a fifth embodiment. [Figure 19] 13 is a bottom view of the armature module of the linear motor according to the fifth embodiment, showing a state in which a fixing member is removed. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a linear motor according to an embodiment of the present disclosure will be described in detail with reference to the drawings.

[0010] Embodiment 1 FIG. 1 is a perspective view of a linear motor according to a first embodiment. FIG. 2 is a cross-sectional view of the linear motor according to the first embodiment. As shown in FIGS. 1 and 2, a linear motor 300 according to the first embodiment includes a primary armature 100 and a secondary magnetic pole 200. The secondary magnetic pole 200 is fixed by a magnetic yoke 201. The secondary magnetic pole 200 in the area facing the armature module 1 of the primary armature 100 is configured, for example, with a three-phase concentrated winding with a combination of four poles and six slots. Note that the secondary magnetic pole 200 in the area facing the armature module 1 is not limited to a three-phase concentrated winding with a combination of four poles and six slots, and may be a mixed-phase winding. As shown in FIG. 2, the primary armature 100 and the secondary magnetic pole 200 are arranged opposite each other with a predetermined magnetic gap S between them. The primary armature 100 is movable relative to the secondary magnetic pole 200 in the direction of travel.

[0011] As shown in Fig. 1, the primary armature 100 has at least one armature module 1. As an example, the primary armature 100 shown in Fig. 1 has a configuration in which two armature modules 1 arranged side by side along the traveling direction are electrically connected by an electric circuit connection part 4.

[0012] Fig. 3 is a perspective view of the armature module of the linear motor according to the first embodiment, showing a state in which a fixing member has been removed. Fig. 4 is a bottom view of the armature module of the linear motor according to the first embodiment, showing a state in which a fixing member has been removed. Fig. 5 is a perspective view of the linear motor according to the first embodiment, showing a state in which a fixing member, an electric circuit connection portion, and a wiring structure portion of the armature module have been removed. As shown in Figs. 1 to 5, the armature module 1 includes a laminated core 2, a coil group 3, an electric circuit connection portion 4, a wiring structure portion 5, and a fixing member 6.

[0013] The laminated core 2 is formed by laminating, for example, a plurality of thin electromagnetic steel sheets, which are magnetic materials. In the following description, the direction in which the electromagnetic steel sheets are stacked is referred to as the lamination thickness direction of the laminated core 2. As shown in FIG. 2 , the laminated core 2 has a core back portion 20 and a teeth group 21. The core back portion 20 extends in the direction of travel of the primary armature 100 and is divided into multiple portions along this direction. The teeth group 21 is composed of multiple teeth 21 a, 21 b arranged in parallel along the direction of travel of the primary armature 100 and extending from the core back portion 20 toward the secondary magnetic pole 200. Each of the teeth 21 a, 21 b of the teeth group 21 is provided on a separate piece of the divided core back portion 20.

[0014] As shown in FIG. 2, the tip surfaces of the teeth 21a, 21b face the secondary magnetic pole 200. The tips of the teeth 21a, 21b are provided with flanges that protrude in the traveling direction of the primary armature 100. The teeth group 21 is made up of a plurality of teeth 21a, 21b. Of the teeth group 21, a group of one or more teeth 21a located at both ends of the primary armature 100 in the traveling direction is called an end teeth group 210. In FIGS. 2 to 5, as an example, each end teeth group 210 is made up of one tooth 21a. Of the teeth group 21, a group of one or more teeth 21b excluding the end teeth group 210 is called a central teeth group 211. As an example, the central teeth group 211 is made up of four teeth 21b. At least one of the end teeth group 210 and the central teeth group 211 has two or more consecutive teeth portions arranged in the direction in which the primary armature 100 travels.

[0015] Here, the length of the teeth 21a of the end teeth group 210 in the lamination thickness direction of the laminated core 2 is defined as t1, and the length of the teeth 21b of the central teeth group 211 in the lamination thickness direction of the laminated core 2 is defined as t2. Here, as an example, all of the teeth 21b of the central teeth group 211 have the same length t2. Note that each end teeth group 210 is made up of one tooth 21a, but it may be made up of two or more teeth 21a. The multiple teeth 21a may have different lengths in the lamination thickness direction of the laminated core 2. In this case, the length of the tooth 21a that is the longest in the lamination thickness direction of the laminated core 2 among the multiple teeth 21a is defined as t1. max The length of the tooth portion 21a that is the shortest in the thickness direction of the laminated core 2 among the plurality of tooth portions 21a is defined as t1. min Furthermore, the multiple teeth 21b of the central teeth group 211 may have different lengths in the lamination thickness direction of the laminated core 2. In this case, the length of the teeth 21b that is the longest in the lamination thickness direction of the laminated core 2 among the multiple teeth 21b is defined as t2 max The length of the tooth portion 21b that is the shortest in the thickness direction of the laminated core 2 among the plurality of tooth portions 21b is defined as t2 min Let's say.

[0016] The length t1 of the tooth portion 21a of the end tooth group 210, which is the longest in the lamination thickness direction of the laminated core 2, is max is the length t2 of the tooth portion 21b of the central tooth group 211, which is the longest in the lamination thickness direction of the laminated core 2. max Preferably, the length t1 of the teeth 21a of the end teeth group 210, which is the longest in the thickness direction of the laminated core 2, is smaller than max is the length t2 of the tooth portion 21b of the central tooth group 211, which is the shortest in the thickness direction of the laminated core 2. min3 to 5, each end teeth group 210 has one tooth 21a, and the central teeth group 211 has four tooth portions 21b. The teeth 21b of the central teeth group 211 all have the same length t2. Therefore, the length t1 of the teeth 21a of the end teeth group 210 in the lamination thickness direction of the laminated core 2 is smaller than the length t2 of the teeth 21b of the central teeth group 211 in the lamination thickness direction of the laminated core 2. As a result, as shown in FIGS. 3 to 5, the difference between the length t1 of the teeth 21a of the end teeth group 210 in the lamination thickness direction of the laminated core 2 and the length t2 of the teeth 21b of the central teeth group 211 in the lamination thickness direction of the laminated core 2 allows space to be formed on one end of the end teeth group 210 in the lamination thickness direction of the laminated core 2 for arranging the electrical circuit connection part 4. Furthermore, the length tmag of the secondary magnetic pole 200 in the thickness direction of the laminated core 2 is set to a length that satisfies t1≦tmag≦t2. Note that, when the laminated core 2 has a plurality of teeth 21a, 21b with different lengths in the thickness direction, t1 min ≦tmag≦t2 max is.

[0017] The plurality of teeth 21a, 21b are provided on each of the divided segments of the divided core back portion 20. Therefore, even if the teeth 21a of the end teeth group 210 in the lamination thickness direction of the laminated core 2 are different from the teeth 21b of the central teeth group 211 in the lamination thickness direction of the laminated core 2, the laminated core 2 can be easily manufactured. However, the core back portion 20 is not limited to a configuration divided in the traveling direction of the primary armature 100, and may be an undivided, integrated configuration. If the core back portion 20 is not divided, no gaps are generated in the divided portions, thereby improving the motor output.

[0018] The coil group 3 is composed of multiple coils wound around each tooth portion 21a, 21b of the tooth group 21. The coil group 3 may be, for example, a mixed-phase winding in which different-phase coils are wound around the same tooth portion 21a, 21b, or may be a concentrated winding. Each coil group 3 wound around each tooth portion 21a, 21b of the tooth group 21 has coil ends 30 at both ends in the lamination thickness direction of the laminated core 2.

[0019] 3 and 4, the electric circuit connection part 4 is disposed on one end side of the end teeth group 210 in the stacking thickness direction of the laminated core 2, in a space formed by the difference between the length of the tooth portion 21a of the end teeth group 210 in the stacking thickness direction of the laminated core 2 and the length of the tooth portion 21b of the central teeth group 211 in the stacking thickness direction of the laminated core 2. The electric circuit connection part 4 faces the coil end 30 of the coil wound around the tooth portion 21a. As shown in FIG. 1, the electric circuit connection part 4 connects adjacent armature modules 1 in the traveling direction of the primary armature 100 to each other.

[0020] 3 and 4, the wiring structure 5 is provided at one end in the lamination thickness direction of the laminated core 2, facing the coil end 30 of the coil wound around the teeth 21b of the central teeth group 211. The wiring structure 5 electrically connects the multiple phase coils to the electric circuit connection part 4.

[0021] The fixing member 6 is composed of a member that mechanically fixes the laminated core 2, the coil group 3, the electric circuit connection portion 4, and the wiring structure portion 5 together.

[0022] As shown in FIG. 4 , the armature module 1 has an actual outer shape 7, which is a rectangular parallelepiped that encompasses the outer shape of the armature module 1 excluding the electric circuit connection portion 4, and an inclusive outer shape that includes the electric circuit connection portion 4. In this case, if the electric circuit connection portion 4 is located outside the actual outer shape 7, the volume of the inclusive outer shape increases, and the thrust force relative to the inclusive outer shape decreases. Furthermore, in a device using a linear motor 300, if the volume of the inclusive outer shape of the armature module 1 is large, it is necessary to increase the space around the armature module 1 to prevent the armature module 1 from moving relative to the secondary magnetic pole 200, which may increase the overall size of the device. Furthermore, if the lamination thickness of the laminated core 2 is reduced to reduce the volume of the inclusive outer shape, the magnetic flux linkage with the secondary magnetic pole 200 may decrease, resulting in reduced thrust and thrust density.

[0023] 3 and 4, in the linear motor 300 according to the first embodiment, the electric circuit connection part 4 is disposed in the space formed by the difference between the length t1 of the tooth portion 21a of the end tooth group 210 in the stacking thickness direction of the laminated core 2 and the length t2 of the tooth portion 21b of the central tooth group 211 in the stacking thickness direction of the laminated core 2. This allows the electric circuit connection part 4 to be disposed inside the actual outer shape 7 of the armature module 1, which prevents an increase in the volume of the overall outer shape and therefore prevents a decrease in thrust relative to the overall outer shape. Although not shown, at least a portion of the electric circuit connection part 4 may be disposed inside the actual outer shape 7 of the armature module 1.

[0024] Furthermore, in the linear motor 300 according to the first embodiment, the length t1 of the tooth portion 21a of the end teeth group 210, which is the maximum length in the lamination thickness direction of the laminated core 2, is max However, among the teeth 21b of the central teeth group 211, the length of the teeth 21b in the thickness direction of the laminated core 2 is the maximum. maxThat is, in the linear motor 300 according to the first embodiment, the lamination thickness of the teeth 21b of the central teeth group 211, which is a portion where the electric circuit connection portion 4 is not arranged, is increased. This makes it possible to increase the magnetic flux linkage with the secondary magnetic pole 200, compared to, for example, a case where all teeth have the length t1 of the teeth 21a of the end teeth group 210. That is, it is possible to increase the induced power, and therefore the thrust force relative to the overall outer shape.

[0025] Furthermore, in the linear motor 300 according to the first embodiment, the length t1 of the tooth portion 21a of the end teeth group 210, which is the maximum length in the lamination thickness direction of the laminated core 2, is max However, among the teeth 21b of the central teeth group 211, the length of the teeth 21b in the thickness direction of the laminated core 2 is the shortest. min In this case, the thickness of the teeth 21b of the central teeth group 211, which is the portion where the electric circuit connection portion 4 is not arranged, can be further increased, thereby further increasing the thrust force against the overall outer shape.

[0026] Furthermore, the central teeth group 211 has two or more teeth 21b. In the linear motor 300, two or more teeth 21b of the central teeth group 211 are arranged in a row, thereby enabling the thrust to be increased in accordance with the size of the electric circuit connection portion 4. In other words, even with a small electric circuit connection portion 4, the thrust can be increased by using multiple teeth 21b. Note that the linear motor 300 may have two or more teeth 21a of the end teeth group 210 arranged in a row. In this case, the space for arranging the electric circuit connection portion 4 can be increased, thereby easing the size restrictions on the electric circuit connection portion 4. In other words, even if a large electric circuit connection portion 4 is arranged, the overall outline can be reduced. Furthermore, in this example, the length of all teeth 21b of the central teeth group 211 in the lamination thickness direction of the laminated core 2 is the same. In other words, the length of all teeth 21b is maximized in the actual outline 7 of the armature module 1, thereby enabling the thrust to be improved.

[0027] Furthermore, in general, in a linear motor, the higher the desired thrust, the larger the required current, resulting in a larger electric circuit connection portion. Therefore, a linear motor requires a large space to accommodate the larger electric circuit connection portion. In the linear motor 300 according to the first embodiment, the electric circuit connection portion 4 is arranged in a space formed on one end side of the end teeth group 210 in the thickness direction of the laminated core 2. This maximizes the difference between the length t1 of the teeth 21a of the end teeth group 210 in the thickness direction of the laminated core 2 and the length t2 of the teeth 21b of the central teeth group 211 in the thickness direction of the laminated core 2. This allows the arrangement of a large electric circuit connection portion 4 while improving thrust.

[0028] Furthermore, in the linear motor 300 according to the first embodiment, the electric circuit connection part 4 is disposed only on one end side of the end teeth group 210 in the lamination thickness direction of the laminated core 2, and therefore the insulation distance between the electric circuit connection part 4 and the other components is also only on one end side of the teeth group 21 in the lamination thickness direction of the laminated core 2. This makes it possible to reduce the dimensions of the components other than the teeth group 21 in the lamination thickness direction of the laminated core 2. In other words, the length of the teeth portions 21a, 21b in the lamination thickness direction of the laminated core 2 can be increased, thereby improving thrust.

[0029] Next, a comparative example of a linear motor 300A will be described. Fig. 6 is a perspective view showing the comparative example of a linear motor. Fig. 7 is a bottom view showing the armature module of the comparative example of a linear motor with fixing members removed. As shown in Figs. 6 and 7, the comparative example of a linear motor 300A includes a primary armature 100A and a secondary magnetic pole 200. The primary armature 100A and the secondary magnetic pole 200 are arranged facing each other with a predetermined magnetic gap between them. The primary armature 100A is movable relative to the secondary magnetic pole 200 in the direction of travel.

[0030] The primary armature 100A has at least one armature module 1A. The armature module 1A includes a laminated core 2A, a coil group 3A, an electric circuit connection portion 4A, a wiring structure portion 5A, and a fixing member 6A. The tooth group 21A constituting the laminated core 2A is composed of multiple tooth portions. All of the tooth portions have the same length t in the lamination thickness direction of the laminated core 2A. The coil group 3A is composed of multiple coils wound around each tooth portion of the tooth group 21A. The electric circuit connection portion 4A is disposed at one end of the laminated core 2A in the lamination thickness direction, facing the coil ends 30A of the coils wound around the teeth portions. The electric circuit connection portion 4A connects adjacent armature modules 1A in the traveling direction of the primary armature 100A. The wiring structure portion 5A is disposed at one end of the laminated core 2A in the lamination thickness direction. The wiring structure 5A electrically connects the multiple phase coils to the electric circuit connection portion 4A. The fixing member 6A is composed of a member that mechanically fixes the laminated core 2A, coil group 3A, electric circuit connection portion 4A, and wiring structure 5A. The secondary magnetic pole 200A is configured to have the same length as the length t of the teeth portion in the lamination thickness direction of the laminated core 2A.

[0031] As shown in Figures 6 and 7, in the linear motor 300A of the comparative example, the electrical circuit connection part 4A is arranged outside the actual outer shape 7A of the armature module 1A, and the volume of the overall outer shape 8A is increased compared to the linear motor 300 of the first embodiment.

[0032] FIG. 8 is a graph showing the relationship between the length of the secondary side poles, the length of the end tooth group, and the length of the central tooth group in the stacking thickness direction of the laminated core, and the thrust. In FIG. 8, a comparison of the thrusts at the same current and the same number of turns is shown. The horizontal axis shown in FIG. 8 indicates the length of the secondary side poles 200, the length of the tooth portions 21a of the end tooth group 210, and the length of the tooth portions 21b of the central tooth group 211 in the stacking thickness direction of the laminated core 2. tmag = t1 = t2 is the case of the linear motor 300A of the comparative example shown in FIGS. 6 and 7. The vertical axis shown in FIG. 8 indicates the thrust. As shown in FIG. 8, when tmag > t1 and t1 < t2, it can be seen that an effect of improving the thrust at the same number of turns and the same current is obtained as compared with the linear motor 300A of the comparative example. Also, when tmag = t2 and t1 < t2, it can be seen that an effect of further improving the thrust is obtained as compared with the linear motor 300A of the comparative example.

[0033] FIG. 9 is a graph showing the relationship between the length of the secondary side poles, the length of the end tooth group, and the length of the central tooth group in the stacking thickness direction of the laminated core, and the cogging thrust. The horizontal axis shown in FIG. 9 indicates the length of the secondary side poles 200, the length of the tooth portions 21a of the end tooth group 210, and the length of the tooth portions 21b of the central tooth group 211 in the stacking thickness direction of the laminated core 2. tmag = t1 = t2 is the case of the linear motor 300A of the comparative example shown in FIGS. 6 and 7. The vertical axis shown in FIG. 9 indicates the cogging thrust. The cogging thrust is the pulsation of the magnetic attraction force between the secondary side poles 200 and the tooth portions of the primary side armature 100. The cogging thrust is generated by the abrupt change of the magnetic flux generated in the magnetic gap due to the difference between the length of the secondary side poles 200 in the stacking thickness direction of the laminated core 2 and the length of the tooth portions 21a of the end tooth group 210 of the primary side armature 100 in the stacking thickness direction of the laminated core 2. Therefore, by reducing the difference between the length tmag of the secondary side poles 200 in the stacking thickness direction of the laminated core 2 and the length t1 of the tooth portions 21a of the end tooth group 210, the magnetic flux generated in the magnetic gap becomes smooth, and the cogging thrust is reduced. In order to improve the positioning accuracy in the linear motor 300, it is desirable that the cogging thrust is low.

[0034] As shown in FIGS. 8 and 9, when tmag = t1 and t1 < t2, an effect of improving the thrust can be obtained while suppressing an increase in the cogging thrust. Also, when tmag = t1 and t1 < t2, it is possible to reduce the current at the same number of turns with respect to a desired thrust, and it is also possible to improve the power efficiency.

[0035] Embodiment 2. Next, the linear motor 301 according to Embodiment 2 will be described. Components that are the same as those in Embodiment 1 are denoted by the same reference numerals, and the description thereof will be omitted as appropriate. FIG. 10 is a perspective view showing the linear motor according to Embodiment 2. FIG. 11 is a perspective view showing a state of the armature module of the linear motor according to Embodiment 2 excluding the fixed member. FIG. 12 is a bottom view showing a state of the armature module of the linear motor according to Embodiment 2 excluding the fixed member.

[0036] As shown in FIGS. 10 and 11, the linear motor 301 according to Embodiment 2 includes a primary-side armature 101 and a secondary-side magnetic pole 200. The secondary-side magnetic pole 200 in the range facing the armature module 11 is configured by a three-phase mixed-phase winding with a combination of 4 poles and 5 slots as an example. Note that the secondary-side magnetic pole 200 in the range facing the armature module 11 is not limited to a three-phase mixed-phase winding with a combination of 4 poles and 5 slots, and a concentrated winding may also be used. The primary-side armature 101 and the secondary-side magnetic pole 200 are arranged to face each other with a predetermined magnetic gap therebetween. The primary-side armature 101 is relatively movable in the traveling direction with respect to the secondary-side magnetic pole 200.

[0037] The primary armature 101 has at least one armature module 11. In a linear motor 301 according to the second embodiment, the configuration of the armature module 11 differs from the configuration of the armature module 11 according to the first embodiment. As shown in FIGS. 11 and 12 , as an example, each end teeth group 210 is made up of one teeth portion 21a. As an example, the central teeth group 211 is made up of three teeth portions 21b. At least one of the end teeth group 210 and the central teeth group 211 has two or more consecutive teeth portions arranged in the direction of travel of the primary armature 101.

[0038] The length t1 of the tooth portion 21a of the end tooth group 210, which is the longest in the lamination thickness direction of the laminated core 2, is max is the length t2 of the tooth portion 21b of the central tooth group 211, which is the longest in the lamination thickness direction of the laminated core 2. max Preferably, the length t1 of the teeth 21a of the end teeth group 210, which is the longest in the thickness direction of the laminated core 2, is smaller than max is the length t2 of the tooth portion 21b of the central tooth group 211, which is the shortest in the thickness direction of the laminated core 2. min 11 and 12, each end tooth group 210 has one tooth 21a, and the central tooth group 211 has three tooth portions 21b. The teeth 21b of the central tooth group 211 all have the same length t2. Therefore, the length t1 of the teeth 21a of the end tooth group 210 in the lamination thickness direction of the laminated core 2 is smaller than the length t2 of the teeth 21b of the central tooth group 211 in the lamination thickness direction of the laminated core 2. As a result, as shown in FIGS. 11 and 12, the difference between the length t1 of the teeth 21a of the end tooth group 210 in the lamination thickness direction of the laminated core 2 and the length t2 of the teeth 21b of the central tooth group 211 in the lamination thickness direction of the laminated core 2 allows space to be formed at both ends of the end tooth group 210 in the lamination thickness direction of the laminated core 2 for arranging the electrical circuit connection portion 4.

[0039] 11 and 12, the electric circuit connection parts 4 are disposed at both ends of the end teeth group 210 in the thickness direction of the laminated core 2, facing the coil ends 30 of the coil wound around the teeth portion 21 a. The wiring structure parts 5 are disposed at both ends of the central teeth group 211 in the thickness direction of the laminated core 2, facing the coil ends 30 of the coil wound around the teeth portion 21 b.

[0040] 11 and 12 , in a linear motor 301 according to the second embodiment, the electric circuit connection part 4 is disposed in a space formed by the difference between the length t1 of the tooth portion 21a of the end teeth group 210 in the stacking thickness direction of the laminated core 2 and the length t2 of each tooth portion 21b of the central teeth group 211 in the stacking thickness direction of the laminated core 2. This allows a portion of the electric circuit connection part 4 to be disposed inside the actual outer shape 7, which prevents an increase in the volume of the overall outer shape 8 and therefore prevents a decrease in thrust relative to the overall outer shape 8. Although not shown, the entire electric circuit connection part 4 may be disposed inside the actual outer shape 7 of the armature module 11.

[0041] In addition, in the linear motor 301 according to the second embodiment, the length t1 of the tooth portion 21a of the end teeth group 210, which is the maximum length in the lamination thickness direction of the laminated core 2, is max However, among the teeth 21b of the central teeth group 211, the length of the teeth 21b in the thickness direction of the laminated core 2 is the maximum. max That is, in the linear motor 301 according to the second embodiment, the lamination thickness of the teeth 21b of the central teeth group 211, which is a portion where the electric circuit connection portion 4 is not arranged, is increased. This makes it possible to increase the magnetic flux linkage with the secondary magnetic pole 200, compared to, for example, a case where all teeth have the length t1 of the teeth 21a of the end teeth group 210. That is, it is possible to increase the induced power, and therefore the thrust force relative to the overall outer shape.

[0042] Furthermore, in the linear motor 301 according to the second embodiment, the tooth portions 21a, 21b are arranged so that the lengths of the tooth group 21 are symmetrical in the stacking thickness direction of the laminated core 2. This makes it possible to suppress bias in the magnetic attraction force at the tip surfaces of the tooth portions 21a, 21b facing the secondary magnetic pole 200, and also reduces the load on the guides that support the linear motor 301.

[0043] Furthermore, in a linear motor, the higher the desired thrust, the larger the required current becomes, and the larger the electric circuit connection portion becomes. In the linear motor 301 according to the second embodiment, the electric circuit connection portion 4 is arranged separately on both sides of the end teeth group 210 in the lamination thickness direction of the laminated core 2, so the current flowing through each electric circuit connection portion 4 can be reduced. This allows the size of each electric circuit connection portion 4 to be reduced.

[0044] Embodiment 3 Next, a linear motor 302 according to a third embodiment will be described. Note that the same components as those in the first embodiment will be given the same reference numerals, and descriptions thereof will be omitted where appropriate. Fig. 13 is a perspective view showing a linear motor according to the third embodiment. Fig. 14 is a perspective view showing an armature module of a linear motor according to the third embodiment, with a fixing member removed. Fig. 15 is a bottom view showing an armature module of a linear motor according to the third embodiment, with a fixing member removed.

[0045] As shown in FIG. 13 , a linear motor 302 according to the third embodiment includes a primary armature 102 and a secondary magnetic pole 200. The secondary magnetic pole 200 in the area facing the armature module 12 is configured, for example, with a three-phase mixed-phase winding of four poles and five slots. Note that the secondary magnetic pole 200 in the area facing the armature module 12 is not limited to a three-phase mixed-phase winding of four poles and five slots, and may be a concentrated winding. The primary armature 102 and the secondary magnetic pole 200 are disposed opposite each other with a predetermined magnetic gap between them. The primary armature 102 is movable relative to the secondary magnetic pole 200 in the direction of travel.

[0046] The primary armature 102 has at least one armature module 12. In a linear motor 302 according to the third embodiment, the configuration of the armature module 12 differs from the configuration of the armature module 12 according to the first embodiment. As shown in FIGS. 14 and 15 , as an example, each end teeth group 210 is composed of two teeth portions 21a. As an example, the central teeth group 211 is composed of one tooth portion 21b. At least one of the end teeth group 210 and the central teeth group 211 has two or more consecutive teeth portions arranged in the direction of travel of the primary armature 102. In the linear motor 302, because two or more teeth portions 21a of the end teeth group 210 are arranged in succession, the space for arranging the electric circuit connection portion 4 can be increased, and restrictions on the size of the electric circuit connection portion 4 can be alleviated. In other words, even if a large electric circuit connection portion 4 is arranged, the overall outer shape can be reduced.

[0047] The length t1 of the tooth portion 21a of the end tooth group 210, which is the longest in the lamination thickness direction of the laminated core 2, is max is the length t2 of the tooth portion 21b of the central tooth group 211, which is the longest in the lamination thickness direction of the laminated core 2. max Preferably, the length t1 of the teeth 21a of the end teeth group 210, which is the longest in the thickness direction of the laminated core 2, is smaller than max is the length t2 of the tooth portion 21b of the central tooth group 211, which is the shortest in the thickness direction of the laminated core 2. min 14 and 15, the end teeth group 210 has two teeth 21a, and the central teeth group 211 has one tooth 21b. The two teeth 21a of the end teeth group 210 have different lengths in the thickness direction of the laminated core 2. Therefore, the length t1 of the teeth 21a of the end teeth group 210 in the thickness direction of the laminated core 2 is maxis smaller than the length t2 of the tooth portion 21b of the central tooth group 211 in the thickness direction of the laminated core 2. As a result, as shown in FIGS. 14 and 15, the lengths t1, t1 of the tooth portion 21a of the end tooth group 210 in the thickness direction of the laminated core 2 max The difference between the length t1 of the tooth portion 21b of the central tooth group 211 in the thickness direction of the laminated core 2 and the length t2 of the tooth portion 21b of the central tooth group 211 in the thickness direction of the laminated core 2 allows space to be created at one end side of the end tooth group 210 in the thickness direction of the laminated core 2 for arranging the electrical circuit connection portion 4.

[0048] 14 and 15, the electric circuit connection portion 4 is disposed on one end side of the end teeth group 210 in the stacking thickness direction of the laminated core 2, facing the coil end 30 of the coil wound around the tooth portion 21 a. The wiring structure portion 5 is disposed on one end side of the central teeth group 211 in the stacking thickness direction of the laminated core 2, facing the coil end 30 of the coil wound around the tooth portion 21 b.

[0049] As shown in FIGS. 14 and 15, in a linear motor 302 according to the third embodiment, the lengths t1 and t1 of the tooth portions 21a of the end teeth group 210 in the lamination thickness direction of the laminated core 2 are max and the length t2 of each tooth portion 21b of the central teeth group 211 in the lamination thickness direction of the laminated core 2, the electric circuit connection portion 4 is disposed in the space formed by this difference. This allows the electric circuit connection portion 4 to be disposed inside the actual outer shape 7, which prevents an increase in the volume of the overall outer shape and therefore prevents a decrease in thrust relative to the overall outer shape. Although not shown in the drawings, at least a portion of the electric circuit connection portion 4 may be disposed inside the actual outer shape 7 of the armature module 12.

[0050] In addition, in the linear motor 302 according to the third embodiment, the length t1 of the tooth portion 21a of the end teeth group 210, which is the maximum length in the lamination thickness direction of the laminated core 2, is max However, among the teeth 21b of the central teeth group 211, the length of the teeth 21b in the thickness direction of the laminated core 2 is the maximum. maxThat is, in the linear motor 302 according to the third embodiment, the lamination thickness of the teeth 21b of the central teeth group 211, which is a portion where the electric circuit connection portion 4 is not arranged, is increased. This makes it possible to increase the magnetic flux linkage with the secondary magnetic pole 200, compared to, for example, a case where all teeth have the length t1 of the teeth 21a of the end teeth group 210. That is, it is possible to increase the induced power, and therefore the thrust force relative to the overall outer shape.

[0051] Furthermore, in a linear motor, the higher the desired thrust, the larger the required current becomes, and the larger the electric circuit connection part becomes. A linear motor 302 according to the third embodiment has a configuration in which two or more teeth 21a of different lengths in the lamination thickness direction of the laminated core 2 are arranged to match the shape of the electric circuit connection part 4. This increases the induced power, and therefore the thrust force can be increased.

[0052] Embodiment 4 Next, a linear motor 303 according to a fourth embodiment will be described. The same components as those in the first embodiment will be given the same reference numerals, and their description will be omitted where appropriate. Fig. 16 is a cross-sectional view showing a linear motor according to the fourth embodiment. Fig. 17 is a bottom view showing an armature module of the linear motor according to the fourth embodiment with fixing members removed.

[0053] As shown in FIGS. 16 and 17 , a linear motor 303 according to the fourth embodiment includes a primary armature 103 and a secondary magnetic pole 200. The secondary magnetic pole 200 in the area facing the armature module 13 is configured, for example, with a three-phase mixed-phase winding of four poles and five slots. Note that the secondary magnetic pole 200 in the area facing the armature module 13 is not limited to a three-phase mixed-phase winding of four poles and five slots, and may be a concentrated winding. The primary armature 103 and the secondary magnetic pole 200 are arranged opposite each other with a predetermined magnetic gap between them. The primary armature 103 is movable relative to the secondary magnetic pole 200 in the direction of travel.

[0054] The primary armature 103 has at least one armature module 13. In a linear motor 303 according to the fourth embodiment, the configuration of the armature module 13 differs from the configuration of the armature module 1 in the first embodiment. As shown in FIGS. 16 and 17 , as an example, each end teeth group 210 is made up of one teeth portion 21a. As an example, the central teeth group 211 is made up of three teeth portions 21b. At least one of the end teeth group 210 and the central teeth group 211 has two or more consecutive teeth portions arranged in the traveling direction of the primary armature 103.

[0055] The length t1 of the tooth portion 21a of the end tooth group 210, which is the longest in the lamination thickness direction of the laminated core 2, is max is the length t2 of the tooth portion 21b of the central tooth group 211, which is the longest in the lamination thickness direction of the laminated core 2. max Preferably, the length t1 of the teeth 21a of the end teeth group 210, which is the longest in the thickness direction of the laminated core 2, is smaller than max is the length t2 of the tooth portion 21b of the central tooth group 211, which is the shortest in the thickness direction of the laminated core 2. min 16 and 17, each end tooth group 210 has one tooth 21a, and the central tooth group 211 has three tooth portions 21b. The teeth 21b of the central tooth group 211 all have the same length t2. Therefore, the length t1 of the teeth 21a of the end tooth group 210 in the lamination thickness direction of the laminated core 2 is smaller than the length t2 of the teeth 21b of the central tooth group 211 in the lamination thickness direction of the laminated core 2. As a result, as shown in FIG. 17, the difference between the length t1 of the teeth 21a of the end tooth group 210 in the lamination thickness direction of the laminated core 2 and the length t2 of the teeth 21b of the central tooth group 211 in the lamination thickness direction of the laminated core 2 allows space to be formed on one end of the end tooth group 210 in the lamination thickness direction of the laminated core 2 for arranging an electrical circuit connection portion 4.

[0056] Furthermore, the tip surfaces of the teeth 21a of the end teeth group 210 facing the secondary magnetic pole 200 have a width x1 in the direction of travel of the primary armature 103. On the other hand, the tip surfaces of the teeth 21b of the central teeth group 211 facing the secondary magnetic pole 200 have a width x2 in the direction of travel of the primary armature 103. The width x1 of the tip surfaces of the teeth 21a of the end teeth group 210 is larger than the width x2 of the tip surfaces of the teeth 21b of the central teeth group 211. The area S1 of the tip surfaces of the teeth 21a of the end teeth group 210 is x1×t1. The area S2 of the tip surfaces of the teeth 21b of the central teeth group 211 is x2×t2. The area S1 of the tip end surface of the tooth portion 21a of the end teeth group 210 is equal to or larger than the area S2 of the tip end surface of each tooth portion 21b of the central teeth group 211.

[0057] 17, the electric circuit connection portion 4 is disposed on one end side of the end teeth group 210 in the stacking thickness direction of the laminated core 2, facing the coil end 30 of the coil wound around the tooth portion 21 a. The wiring structure portion 5 is disposed on one end side of the central teeth group 211 in the stacking thickness direction of the laminated core 2, facing the coil end 30 of the coil wound around the tooth portion 21 b.

[0058] 16 and 17 , in a linear motor 303 according to the fourth embodiment, the electric circuit connection part 4 is disposed in a space formed by the difference between the length t1 of the tooth portion 21a of the end teeth group 210 in the stacking thickness direction of the laminated core 2 and the length t2 of each tooth portion 21b of the central teeth group 211 in the stacking thickness direction of the laminated core 2. This allows the electric circuit connection part 4 to be disposed inside the actual outer shape 7, which prevents an increase in the volume of the overall outer shape and therefore prevents a decrease in thrust relative to the overall outer shape. Although not shown, at least a portion of the electric circuit connection part 4 may be disposed inside the actual outer shape 7 of the armature module 13.

[0059] Furthermore, in the linear motor 303 according to the fourth embodiment, the length t1 of the tooth portion 21a of the end teeth group 210, which is the maximum length in the lamination thickness direction of the laminated core 2, is max However, among the teeth 21b of the central teeth group 211, the length of the teeth 21b in the thickness direction of the laminated core 2 is the maximum. max That is, in the linear motor 303 according to the fourth embodiment, the lamination thickness of the teeth 21b of the central teeth group 211, which is a portion where the electric circuit connection portion 4 is not arranged, is increased. This makes it possible to increase the magnetic flux linkage with the secondary magnetic pole 200, compared to, for example, a case where all teeth have the length t1 of the teeth 21a of the end teeth group 210. That is, it is possible to increase the induced power, and therefore the thrust force relative to the overall outer shape.

[0060] Furthermore, in general, the flux linkage of the teeth 21 a, 21 b is proportional to the area of ​​the tip surface facing the secondary magnetic pole 200. Therefore, if the length of the teeth 21 a of the end teeth group 210 in the lamination thickness direction of the laminated core 2 is short, the flux linkage between the teeth 21 a and the secondary magnetic pole 200 decreases, and the induced voltage decreases. Furthermore, the cogging thrust increases depending on the difference between the length tmag of the secondary magnetic pole 200 in the lamination thickness direction of the laminated core 2 and the length t1 of the teeth 21 a of the end teeth group 210. Therefore, in the linear motor 303 according to the fourth embodiment, the area S1 of the tip surface of the teeth 21 a of the end teeth group 210 facing the secondary magnetic pole 200 is set to be equal to or larger than the area S2 of the tip surface of the teeth 21 b of the central teeth group 211 facing the secondary magnetic pole 200. As a result, the linear motor 303 according to the fourth embodiment can increase the magnetic flux linkage between the tooth portion 21a of the end teeth group 210 and the secondary magnetic pole 200. This increases the induced power and increases the thrust. Furthermore, the linear motor 303 according to the fourth embodiment can reduce the cogging thrust of the slot order component or the pole slot order component because the magnetic flux generated in the magnetic gap in the tooth portion 21a is smoothed.

[0061] The configuration in which area S1 of the tip surface of tooth portion 21a of end teeth group 210 facing secondary pole 200 is equal to or larger than area S2 of the tip surface of tooth portion 21b of central teeth group 211 facing secondary pole 200 is not limited to the above configuration. For example, by making the tip surfaces of tooth portions 21a, 21b have different shapes or positions, area S1 of the tip surface of tooth portion 21a of end teeth group 210 may be equal to or larger than area S2 of the tip surface of tooth portion 21b of central teeth group 211.

[0062] Embodiment 5. Next, a linear motor 304 according to a fifth embodiment will be described. The same components as those in the first embodiment will be given the same reference numerals, and the description thereof will be omitted as appropriate. Fig. 18 is a cross-sectional view showing a linear motor according to the fifth embodiment. Fig. 19 is a bottom view showing an armature module of the linear motor according to the fifth embodiment with fixing members removed.

[0063] As shown in FIGS. 18 and 19 , a linear motor 304 according to the fifth embodiment includes a primary armature 104 and a secondary magnetic pole 200. The secondary magnetic pole 200 in the area facing the armature module 14 is configured, for example, with a three-phase mixed-phase winding of four poles and five slots. Note that the secondary magnetic pole 200 in the area facing the armature module 14 is not limited to a three-phase mixed-phase winding of four poles and five slots, and may be a concentrated winding. The primary armature 104 and the secondary magnetic pole 200 are disposed opposite each other with a predetermined magnetic gap between them. The primary armature 104 is movable relative to the secondary magnetic pole 200 in the direction of travel.

[0064] The primary armature 104 has at least one armature module 14. In a linear motor 304 according to the fifth embodiment, the configuration of the armature module 14 differs from the configuration of the armature module 1 in the first embodiment. As shown in FIGS. 18 and 19 , as an example, each end teeth group 210 is made up of one teeth portion 21a. As an example, the central teeth group 211 is made up of three teeth portions 21b. At least one of the end teeth group 210 and the central teeth group 211 has two or more consecutive teeth portions arranged in the traveling direction of the primary armature 104.

[0065] The length t1 of the tooth portion 21a of the end tooth group 210, which is the longest in the lamination thickness direction of the laminated core 2, is max is the length t2 of the tooth portion 21b of the central tooth group 211, which is the longest in the lamination thickness direction of the laminated core 2. max Preferably, the length t1 of the teeth 21a of the end teeth group 210, which is the longest in the thickness direction of the laminated core 2, is smaller than max is the length t2 of the tooth portion 21b of the central tooth group 211, which is the shortest in the thickness direction of the laminated core 2. min 18 and 19, each end tooth group 210 has one tooth 21a, and the central tooth group 211 has three tooth portions 21b. The teeth 21b of the central tooth group 211 all have the same length t2. Therefore, the length t1 of the teeth 21a of the end tooth group 210 in the lamination thickness direction of the laminated core 2 is smaller than the length t2 of the teeth 21b of the central tooth group 211 in the lamination thickness direction of the laminated core 2. As a result, as shown in FIG. 19, the difference between the length t1 of the teeth 21a of the end tooth group 210 in the lamination thickness direction of the laminated core 2 and the length t2 of the teeth 21b of the central tooth group 211 in the lamination thickness direction of the laminated core 2 allows space to be formed on one end of the end tooth group 210 in the lamination thickness direction of the laminated core 2 for arranging an electrical circuit connection portion 4.

[0066] Furthermore, the number of turns of the coil wound around each tooth 21a of the end teeth group 210 is greater than the number of turns of the coil wound around each tooth 21b of the central teeth group 211. If either of the teeth 21a, 21b is a mixed-phase winding, the number of turns of the coil of the tooth that is a mixed-phase winding is the sum of the turns of the different-phase coils.

[0067] 19, the electric circuit connection portion 4 is disposed on one end side of the end teeth group 210 in the stacking thickness direction of the laminated core 2, facing the coil end 30 of the coil wound around the tooth portion 21 a. The wiring structure portion 5 is disposed on one end side of the central teeth group 211 in the stacking thickness direction of the laminated core 2, facing the coil end 30 of the coil wound around the tooth portion 21 b.

[0068] 18 and 19 , in a linear motor 304 according to the fifth embodiment, the electric circuit connection part 4 is disposed in a space formed by the difference between the length t1 of the tooth portion 21a of the end tooth group 210 in the stacking thickness direction of the laminated core 2 and the length t2 of each tooth portion 21b of the central tooth group 211 in the stacking thickness direction of the laminated core 2. This allows the electric circuit connection part 4 to be disposed inside the actual outer shape 7, which prevents an increase in the volume of the overall outer shape and therefore prevents a decrease in thrust relative to the overall outer shape. Although not shown, at least a portion of the electric circuit connection part 4 may be disposed inside the actual outer shape 7 of the armature module 14.

[0069] Furthermore, in the linear motor 304 according to the fifth embodiment, the length t1 of the tooth portion 21a of the end teeth group 210, which is the maximum length in the lamination thickness direction of the laminated core 2, is max However, among the teeth 21b of the central teeth group 211, the length of the teeth 21b in the thickness direction of the laminated core 2 is the maximum. maxThat is, in the linear motor 304 according to the fifth embodiment, the lamination thickness of the teeth 21b of the central teeth group 211, which is a portion where the electric circuit connection portion 4 is not arranged, is increased. This makes it possible to increase the magnetic flux linkage with the secondary magnetic pole 200, compared to, for example, a case where all teeth have the length t1 of the teeth 21a of the end teeth group 210. That is, it is possible to increase the induced power, and therefore the thrust force relative to the overall outer shape.

[0070] Furthermore, the magnetic flux linkage of the teeth 21 a, 21 b is proportional to the area of ​​the tip end surface facing the secondary magnetic pole 200. Therefore, in the end teeth group 210 where the length in the lamination thickness direction of the laminated core 2 is short, the magnetic flux linkage with the secondary magnetic pole 200 decreases, and the induced voltage decreases. This induced voltage is proportional to the number of turns of the coil wound around the teeth 21 a, 21 b. In the linear motor 304 according to the fifth embodiment, the number of turns of the coil wound around each tooth 21 a of the end teeth group 210 is greater than the number of turns of the coil wound around each tooth 21 b of the central teeth group 211. Therefore, the induced voltage in the end teeth group 210 can be increased, and thrust can be improved. In this way, by adjusting the lengths of the teeth 21 a of the end teeth group 210 and the teeth 21 b of the central teeth group 211 in the lamination thickness direction of the laminated core 2, and the number of turns of the coil wound around each tooth 21 a of the end teeth group 210 and each tooth 21 b of the central teeth group 211, a greater effect can be achieved. Furthermore, the induced voltage constants of the teeth 21 a, 21 b can be balanced, thereby reducing thrust ripple. A similar effect can also be achieved in mixed-phase winding, in which different-phase coils are wound around the same teeth 21 a, 21 b.

[0071] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies or may be combined with other embodiments. Furthermore, it is also possible to omit or modify part of the configurations without departing from the spirit of the invention. [Explanation of symbols]

[0072] 1,1A,11,12,13,14 armature module, 2,2A laminated core, 3,3A coil group, 4,4A electrical circuit connection portion, 5,5A wiring structure portion, 6,6A fixing member, 7,7A actual outline, 8,8A comprehensive outline, 20 core back portion, 21,21A teeth group, 21a,21b teeth portion, 30,30A coil end, 100,100A,101,102,103,104 primary side armature, 200,200A secondary side magnetic pole, 201 magnetic yoke, 210 end teeth group, 211 center teeth group, 300,300A,301,302,303,304 linear motor.

Claims

1. a primary armature having at least one armature module; a secondary magnetic pole disposed opposite the primary armature with a predetermined magnetic gap therebetween, The armature module includes: a laminated core having a core back portion extending in the direction of travel of the primary armature, and a teeth group consisting of a plurality of teeth portions arranged in parallel along the direction of travel of the primary armature and extending from the core back portion toward the secondary magnetic pole; a coil group consisting of a plurality of coils wound around each of the teeth of the tooth group; an electric circuit connection portion that is arranged at an end of a tooth group in a lamination thickness direction of the laminated core and connects the armature modules that are adjacent to each other in a traveling direction of the primary armature; a wiring structure portion that electrically connects the coil group and the electric circuit connection portion, the teeth group includes an end teeth group consisting of one or more groups of the teeth portions located on both sides of the primary armature in the direction of travel, and a central teeth group consisting of one or more groups of the teeth portions excluding the end teeth group, at least one of the end teeth group and the central teeth group has two or more consecutive teeth portions arranged along the direction of travel of the primary armature, Among the tooth portions of the end tooth group, the length of the tooth portion that is maximum in the lamination thickness direction of the laminated core is shorter than the length of the tooth portion of the central tooth group that is maximum in the lamination thickness direction of the laminated core, a length of the secondary magnetic pole in the thickness direction of the laminated core is greater than a length of the tooth portion of the end teeth group that has a minimum length in the thickness direction of the laminated core, The electrical circuit connection portion is disposed on one or both ends of the end teeth group in the thickness direction of the laminated core, in a space formed by the difference between the length of the tooth portion of the end teeth group in the thickness direction of the laminated core and the length of the tooth portion of the central teeth group in the thickness direction of the laminated core, and at least a portion of the electrical circuit connection portion is disposed inside the actual outer shape of the armature module, which is a rectangular parallelepiped that includes the outer shape of the armature module excluding the electrical circuit connection portion. A linear motor characterized by:

2. Among the tooth portions of the end tooth group, the length of the tooth portion that is maximum in the lamination thickness direction of the laminated core is shorter than the length of the tooth portion of the central tooth group that is minimum in the lamination thickness direction of the laminated core.

2. The linear motor according to claim 1.

3. the central teeth group includes two or more of the teeth portions, The lengths of the tooth portions of the central teeth group in the lamination thickness direction of the laminated core are all the same.

3. The linear motor according to claim 1 or 2.

4. the core back portion extends in a direction of travel of the primary armature and is divided into a plurality of portions along the direction of travel, Each of the tooth portions of the tooth group is provided on a separate piece of the divided core back portion.

3. The linear motor according to claim 1 or 2.

5. an area of ​​a tip end surface of the tooth portion of the end teeth group facing the secondary magnetic pole is equal to or larger than an area of ​​a tip end surface of the tooth portion of the central teeth group facing the secondary magnetic pole; 3. The linear motor according to claim 1 or 2.

6. the number of turns of the coil wound around each of the teeth of the end teeth group is greater than the number of turns of the coil wound around each of the teeth of the central teeth group; 3. The linear motor according to claim 1 or 2.

7. the length of the secondary magnetic pole in the thickness direction of the laminated core is shorter than the length of the tooth portion of the central teeth group that has the longest length in the thickness direction of the laminated core; 3. The linear motor according to claim 1 or 2.

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