Linear electric motor

Abstract

A linear electric motor according to the present invention comprises a primary-side armature and a secondary-side magnetic pole. An armature module (1) comprises: a stacked iron core that has a core back part and a tooth group (21) that comprises a plurality of tooth parts (21a, 21b); a coil group (3); an electrical circuit connection part (4); and a wire connection structure part (5). The tooth group (21) includes: an end tooth group (210) that comprises a group of tooth parts (21a); and a center tooth group (211) that comprises a group of tooth parts (21b). The electrical circuit connection part (4) is disposed in a space that is formed by the difference between the length of the tooth parts (21a) of the end tooth group (210) in the stacking direction of the stacked iron core and the length of the tooth parts (21b) of the center tooth group (211) in the stacking direction of the stacked iron core, and at least a portion is disposed inside an actual outer shape (7) that is a rectangular cuboid that contains a region formed by excluding the electrical circuit connection part (4) from the outer shape of the armature module (1).

Description

Linear motor

[0001] This disclosure relates to a linear motor.

[0002] Conventionally, linear motors comprising a primary armature and secondary magnetic poles are known. The primary armature is movable relative to the secondary magnetic poles in the direction of travel. For example, Patent Document 1 discloses a movable magnet type linear motor comprising an armature which is a stator, and permanent magnets and magnetic yokes which are movable parts. The armature is composed of a plurality of armature blocks. The armature block has a laminated core, armature coils, and connectors. The laminated core has a plurality of teeth. The plurality of teeth are arranged at intervals along the direction of travel of the movable part and extend toward the movable part. All teeth are formed to be the same length. Armature coils are wound around the teeth. Connectors are arranged at both ends of the laminated core in the direction of travel of the movable part and are provided to electrically connect adjacent armature blocks in the direction of travel. The connectors are provided protruding from both sides of the laminated core perpendicular to the direction of travel of the movable part.

[0003] Japanese Patent Publication No. 2004-23954

[0004] However, in the technology disclosed in Patent Document 1, if the actual outer shape is a rectangular parallelepiped encompassing the other parts of the armature block excluding the connector, and the enclosing outer shape is a rectangular parallelepiped of the armature block including the connector, the connector is positioned outside the actual outer shape, which increases the volume of the enclosing outer shape and may reduce the thrust relative to the enclosing outer shape.

[0005] This disclosure has been made in view of the above, and aims to provide a linear motor that can suppress an increase in the volume of the overall shape of the armature module and increase the thrust relative to the overall shape.

[0006] To solve the above-mentioned problems and achieve the objective, the linear motor according to this disclosure comprises 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 comprises a laminated core having a core back portion extending in the direction of travel of the primary armature, and a group of teeth 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 group of coils consisting of a plurality of coils wound around each tooth of the group of teeth, an electrical circuit connection portion arranged at the end of the group of teeth in the thickness direction of the laminated core and connecting adjacent armature modules in the direction of travel of the primary armature, and a connection structure portion that electrically connects the group of coils and the electrical circuit connection portion. The teeth group comprises an end teeth group consisting of one or more teeth located on both sides of the primary armature's direction of travel, and a central teeth group consisting of one or more teeth excluding the end teeth group. In at least one of the end teeth group and the central teeth group, two or more teeth are arranged consecutively along the direction of travel of the primary armature. The length of the tooth in the end teeth group that has the longest length in the stacking thickness direction of the laminated core is smaller than the length of the tooth in the central teeth group that has the longest length in the stacking 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 teeth portion of the end teeth group in the stacking thickness direction of the laminated core and the length of the teeth 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 encompasses the portion of the armature module excluding the electrical circuit connection portion.

[0007] The linear motor according to this disclosure has the effect of suppressing an increase in the volume of the overall shape of the armature module and increasing the thrust applied to the overall shape.

[0008] A perspective view showing a linear motor according to Embodiment 1. A cross-sectional view showing a linear motor according to Embodiment 1. A perspective view showing the armature module of the linear motor according to Embodiment 1 with the fixing members removed. A bottom view showing the armature module of the linear motor according to Embodiment 1 with the fixing members removed. A perspective view showing the armature module of the linear motor according to Embodiment 1 with the fixing members, electrical circuit connection part and wiring structure part of the armature module removed. A perspective view showing a linear motor of a comparative example. A bottom view showing the armature module of the linear motor of a comparative example with the fixing members removed. A graph showing the relationship between the length of the secondary magnetic poles, the length of the end teeth group and the length of the central teeth group in the stacking thickness direction of the laminated core and the thrust. A graph showing the relationship between the length of the secondary magnetic poles, the length of the end teeth group and the length of the central teeth group in the stacking thickness direction of the laminated core and the cogging thrust. The graph shows: A perspective view of a linear motor according to Embodiment 2; A perspective view of the armature module of the linear motor according to Embodiment 2, with the fixing member removed; A bottom view of the armature module of the linear motor according to Embodiment 2, with the fixing member removed; A perspective view of a linear motor according to Embodiment 3; A perspective view of the armature module of the linear motor according to Embodiment 3, with the fixing member removed; A bottom view of the armature module of the linear motor according to Embodiment 3, with the fixing member removed; A cross-sectional view of a linear motor according to Embodiment 4; A bottom view of the armature module of the linear motor according to Embodiment 4, with the fixing member removed; A cross-sectional view of a linear motor according to Embodiment 5; A bottom view of the armature module of the linear motor according to Embodiment 5, with the fixing member removed.

[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. Figure 1 is a perspective view showing a linear motor according to Embodiment 1. Figure 2 is a cross-sectional view showing a linear motor according to Embodiment 1. As shown in Figures 1 and 2, the linear motor 300 according to Embodiment 1 comprises a primary armature 100 and secondary poles 200. The secondary poles 200 are fixed by a magnetic yoke 201. The secondary poles 200 in the range of the primary armature 100 that faces the armature module 1 are, as an example, composed of a 3-phase concentrated winding with a combination of 4 poles and 6 slots. Note that the secondary poles 200 in the range of the armature module 1 that faces the armature module 1 are not limited to a 3-phase concentrated winding with a combination of 4 poles and 6 slots, but may also be a mixed-phase winding. As shown in Figure 2, the primary armature 100 and the secondary poles 200 are arranged facing each other with a predetermined magnetic gap S between them. The primary armature 100 is made movable relative to the secondary magnetic pole 200 in the direction of travel.

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

[0012] Figure 3 is a perspective view of the armature module of a linear motor according to Embodiment 1, with the fixing members removed. Figure 4 is a bottom view of the armature module of a linear motor according to Embodiment 1, with the fixing members removed. Figure 5 is a perspective view of the linear motor according to Embodiment 1, with the fixing members, electrical circuit connection part, and wiring structure part of the armature module removed. As shown in Figures 1 to 5, the armature module 1 comprises a laminated iron core 2, a coil group 3, an electrical circuit connection part 4, a wiring structure part 5, and a fixing member 6.

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

[0014] As shown in Figure 2, the tip surfaces of the teeth 21a and 21b face the secondary magnetic pole 200. The tips of the teeth 21a and 21b are provided with flanges that protrude in the direction of travel of the primary armature 100. The teeth group 21 is composed of multiple teeth 21a and 21b. Among the teeth group 21, a collection of one or more teeth 21a located at both ends in the direction of travel of the primary armature 100 is called an end teeth group 210. In Figures 2 to 5, as an example, each end teeth group 210 is composed of one tooth 21a. Among the teeth group 21, a collection of one or more teeth 21b excluding the end teeth groups 210 is called a central teeth group 211. As an example, the central teeth group 211 is composed of four teeth 21b. In at least one of the end tooth group 210 and the central tooth group 211, two or more teeth are arranged consecutively in the direction of travel of the primary armature 100.

[0015] Here, let t1 be the length of the tooth portion 21a of the end tooth group 210 in the thickness direction of the laminated core 2, and let t2 be the length of the tooth portion 21b of the central tooth group 211 in the thickness direction of the laminated core 2. Here, as an example, each tooth portion 21b of the central tooth group 211 is assumed to have the same length t2. Note that each end tooth group 210 is composed of one tooth portion 21a, but it may be composed of two or more tooth portions 21a. Furthermore, the lengths of the multiple tooth portions 21a may differ in the thickness direction of the laminated core 2. In this case, the length of the tooth portion 21a that has the longest length in the thickness direction of the laminated core 2 is set to t1. ｍａｘ The length of the tooth portion 21a that has the minimum length in the stacking thickness direction of the laminated core 2 is set to t1. ｍｉｎ Furthermore, the lengths of the multiple tooth portions 21b of the central tooth group 211 may differ in the thickness direction of the laminated core 2. In this case, the length of the tooth portion 21b that has the longest length in the thickness direction of the laminated core 2 is set to t2. ｍａｘ The length of the tooth portion 21b that has the minimum length in the stacking thickness direction of the laminated core 2 is set to t2. ｍｉｎ Let's assume that.

[0016] Among the teeth portions 21a of the end teeth group 210, the length t1 of the teeth portion 21a that has the maximum length in the stacking thickness direction of the laminated iron core 2 ｍａｘ This refers to the length t2 of the tooth portion 21b of the central tooth group 211 that has the maximum length in the stacking thickness direction of the laminated iron core 2. ｍａｘ Smaller than. Preferably, among the teeth portions 21a of the end teeth group 210, the length t1 of the teeth portion 21a that has the maximum length in the stacking thickness direction of the laminated iron core 2. ｍａｘ The length t2 of the tooth portion 21b of the central tooth group 211 is the length of the tooth portion 21b that has the minimum length in the thickness direction of the laminated iron core 2. ｍｉｎis smaller. In the cases shown in FIGS. 3 to 5, the number of tooth portions 21a of each end tooth group 210 is one, and the number of tooth portions 21b of the central tooth group 211 is four. And each tooth portion 21b of the central tooth group 211 has the same length t2. Therefore, the length t1 of the tooth portion 21a of the end tooth group 210 in the stacking thickness direction of the laminated core 2 is smaller than the length t2 of the tooth portion 21b of the central tooth group 211 in the stacking thickness direction of the laminated core 2. Thus, as shown in FIGS. 3 to 5, due to 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, a space for arranging the electric circuit connection portion 4 can be formed on one end side of the end tooth group 210 in the stacking thickness direction of the laminated core 2. Also, the length tmag of the secondary side magnetic pole 200 in the stacking thickness direction of the laminated core 2 is set to a length that satisfies t1 ≦ tmag ≦ t2. When there are a plurality of tooth portions 21a, 21b having different lengths in the stacking thickness direction of the laminated core 2, t1 ｍｉｎ ≦ tmag ≦ t2 ｍａｘ holds true.

[0017] Note that the plurality of tooth portions 21a, 21b are respectively provided on each divided piece of the divided core back portion 20. For this reason, even if the tooth portion 21a of the end tooth group 210 in the stacking thickness direction of the laminated core 2 and the tooth portion 21b of the central tooth group 211 in the stacking thickness direction of the laminated core 2 are different, it can be easily manufactured. However, the core back portion 20 is not limited to a configuration divided in the traveling direction of the primary side armature 100, and may be an integral configuration without being divided. When the core back portion 20 is not divided, no gap occurs in the divided portion, so the output of the motor can be improved.

[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 a multi-phase winding in which different phase coils are wound around the same tooth portion 21a, 21b, or it may be a concentrated winding. Each coil group 3 wound around each tooth portion 21a, 21b of the tooth group 21 is provided with coil ends 30 at both ends in the thickness direction of the laminated core 2.

[0019] As shown in Figures 3 and 4, the electrical circuit connection portion 4 is located at one end of the end teeth group 210 in the thickness direction of the laminated core 2, and is positioned in the space formed by the difference between the length of the teeth portion 21a of the end teeth group 210 in the thickness direction of the laminated core 2 and the length of the teeth portion 21b of the central teeth group 211 in the thickness direction of the laminated core 2. The electrical circuit connection portion 4 faces the coil end 30 of the coil wound around the teeth portion 21a. As shown in Figure 1, the electrical circuit connection portion 4 connects adjacent armature modules 1 in the direction of travel of the primary side armature 100.

[0020] As shown in Figures 3 and 4, the connection structure 5 is located at one end of the laminated core 2 in the thickness direction, facing the coil end 30 of the coil wound around the tooth portion 21b of the central tooth group 211. The connection structure 5 electrically connects the multiple phase coils to the electrical circuit connection portion 4.

[0021] The fixing member 6 is composed of members that mechanically fix the laminated iron core 2, the coil group 3, the electrical circuit connection part 4, and the wiring structure part 5.

[0022] Incidentally, as shown in Figure 4, in the armature module 1, the rectangular parallelepiped encompassing the portion of the armature module 1 excluding the electrical circuit connection portion 4 is defined as the actual outer shape 7, and the rectangular parallelepiped including the electrical circuit connection portion 4 is defined as the encompassing outer shape. In this case, if the electrical circuit connection portion 4 is positioned outside the actual outer shape 7, the volume of the encompassing outer shape increases, and the thrust relative to the encompassing outer shape decreases. Furthermore, in devices using a linear motor 300, if the volume of the encompassing outer shape of the armature module 1 is large, it becomes necessary to increase the space around the armature module 1 in order to avoid the armature module 1 moving relative to the secondary magnetic pole 200, which may lead to the overall size of the device increasing. Also, if the length of the stacking thickness of the laminated iron core 2 is reduced in order to reduce the volume of the encompassing outer shape, the flux linked with the secondary magnetic pole 200 decreases, which may lead to a decrease in thrust and thrust density.

[0023] Therefore, as shown in Figures 3 and 4, in the linear motor 300 according to Embodiment 1, the electrical circuit connection portion 4 is arranged 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 electrical circuit connection portion 4 to be placed inside the actual outer shape 7 of the armature module 1, thereby suppressing an increase in the volume of the overall outer shape, and thus suppressing a decrease in thrust relative to the overall outer shape. Although not shown in the figures, at least a part of the electrical circuit connection portion 4 may be placed inside the actual outer shape 7 of the armature module 1.

[0024] Furthermore, in the linear motor 300 according to Embodiment 1, the length t1 of the tooth portion 21a of the end tooth group 210 is the length of the tooth portion 21a that has the maximum length in the thickness direction of the laminated core 2. ｍａｘ However, among the teeth portions 21b of the central teeth group 211, the length t2 of the teeth portion 21b that has the maximum length in the stacking thickness direction of the laminated iron core 2 ｍａｘIt is smaller. That is, in the linear motor 300 according to the first embodiment, the stacking thickness of the tooth portions 21b of the central tooth group 211, which is the portion where the electrical circuit connection portion 4 is not arranged, is increased. Thereby, for example, compared with the case where all the tooth portions have the length t1 of the tooth portions 21a of the end tooth group 210, the magnetic flux linked with the secondary side magnetic pole 200 can be increased. That is, the induced power can be increased, and the thrust with respect to the overall outer shape can be increased.

[0025] Further, in the linear motor 300 according to the first embodiment, among the tooth portions 21a of the end tooth group 210, the length t1 of the tooth portion 21a having the maximum length in the stacking thickness direction of the laminated iron core 2 ｍａｘ is smaller than the length t2 of the tooth portion 21b of the central tooth group 211, which has the minimum length in the stacking thickness direction of the laminated iron core 2. ｍｉｎ It may be configured to be smaller. In this case, since the stacking thickness of the tooth portions 21b of the central tooth group 211, which is the portion where the electrical circuit connection portion 4 is not arranged, can be further increased, the thrust with respect to the overall outer shape can be further increased.

[0026] Further, the central tooth group 211 has two or more tooth portions 21b. The linear motor 300 can increase the thrust in accordance with the size of the electrical circuit connection portion 4 by arranging two or more tooth portions 21b of the central tooth group 211 continuously. That is, even if the electrical circuit connection portion 4 is small, the thrust can be increased by a plurality of tooth portions 21b. In addition, in the linear motor 300, the tooth portions 21a of the end tooth group 210 may be arranged continuously in two or more. In this case, since the space for arranging the electrical circuit connection portion 4 can be increased, the limitation on the size of the electrical circuit connection portion 4 can be relaxed. That is, even if a large electrical circuit connection portion 4 is arranged, the overall outer shape can be made small. Further, here, the lengths of the tooth portions 21b of the central tooth group 211 in the stacking thickness direction of the laminated iron core 2 are all the same. That is, in the actual outer shape 7 of the armature module 1, the lengths of all the tooth portions 21b are maximized, so that the thrust can be improved.

[0027] Also, generally in a linear motor, the higher the desired thrust, the greater the required current and the larger the electrical circuit connection part becomes. Therefore, in a linear motor, a large space is required for arranging the enlarged electrical circuit connection part. In the linear motor 300 according to Embodiment 1, by arranging the electrical circuit connection part 4 in the space formed on one end side of the end tooth group 210 in the stacking thickness direction of the laminated core 2, the difference between the length t1 of the tooth part 21a of the end tooth group 210 and the length t2 of the tooth part 21b of the central tooth group 211 in the stacking thickness direction of the laminated core 2 can be maximized, and while improving the thrust, the large electrical circuit connection part 4 can be arranged.

[0028] Also, in the linear motor 300 according to Embodiment 1, since the electrical circuit connection part 4 is arranged only on one end side of the end tooth group 210 in the stacking thickness direction of the laminated core 2, the insulation distance between the electrical circuit connection part 4 and other components is also only on one end side of the tooth group 21 in the stacking thickness direction of the laminated core 2. Thereby, in other components excluding the tooth group 21, the dimension in the stacking thickness direction of the laminated core 2 can be shortened. That is, since the lengths of the tooth parts 21a and 21b in the stacking thickness direction of the laminated core 2 can be increased, the thrust can be improved.

[0029] Next, the linear motor 300A of the comparative example will be described. FIG. 6 is a perspective view showing the linear motor of the comparative example. FIG. 7 is a bottom view showing the state of the armature module of the linear motor of the comparative example excluding the fixing member. As shown in FIGS. 6 and 7, the linear motor 300A of the comparative example includes a primary-side armature 100A and a secondary-side magnetic pole 200. The primary-side armature 100A and the secondary-side magnetic pole 200 are arranged to face each other with a predetermined magnetic gap therebetween. The primary-side armature 100A is relatively movable in the traveling direction with respect to the secondary-side magnetic pole 200.

[0030] The primary armature 100A has at least one armature module 1A. The armature module 1A comprises a laminated iron core 2A, a coil group 3A, an electrical circuit connection part 4A, a wiring structure part 5A, and a fixing member 6A. The tooth group 21A constituting the laminated iron core 2A is composed of a plurality of tooth sections. Each tooth section has the same length t in the thickness direction of the laminated iron core 2A. The coil group 3A is composed of a plurality of coils wound around each tooth section of the tooth group 21A. The electrical circuit connection part 4A is located at one end of the laminated iron core 2A in the thickness direction and is positioned opposite the coil end 30A of the coil wound around the tooth section. The electrical circuit connection part 4A connects adjacent armature modules 1A in the direction of travel of the primary armature 100A. The wiring structure part 5A is located at one end of the laminated iron core 2A in the thickness direction. The connection structure 5A electrically connects the multiple phase coils to the electrical circuit connection section 4A. The fixing member 6A is composed of members that mechanically fix the laminated iron core 2A, the coil group 3A, the electrical circuit connection section 4A, and the connection structure 5A. The secondary magnetic pole 200A is configured to have the same length t as the length of the teeth portion in the thickness direction of the laminated iron core 2A.

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

[0032] Figure 8 is a graph showing the relationship between the length of the secondary magnetic poles, the length of the end teeth group, and the length of the central teeth group in the thickness direction of the laminated core, and the thrust. Figure 8 shows a comparison of thrust at the same current and number of turns. The horizontal axis in Figure 8 shows the length of the secondary magnetic poles 200, the length of the teeth portion 21a of the end teeth group 210, and the length of the teeth portion 21b of the central teeth group 211 in the thickness direction of the laminated core 2. tmag = t1 = t2 is the case for the linear motor 300A of the comparative example shown in Figures 6 and 7. The vertical axis in Figure 8 shows the thrust. As shown in Figure 8, when tmag > t1 and t1 < t2, it can be seen that the thrust is improved compared to the linear motor 300A of the comparative example at the same number of turns and current. Furthermore, when tmag = t2 and t1 < t2, it can be seen that the thrust is improved even more compared to the linear motor 300A of the comparative example.

[0033] Figure 9 is a graph showing the relationship between the length of the secondary magnetic poles, the length of the end teeth group, and the length of the central teeth group in the thickness direction of the laminated core, and the cogging thrust. The horizontal axis in Figure 9 shows the length of the secondary magnetic poles 200, the length of the teeth portion 21a of the end teeth group 210, and the length of the teeth portion 21b of the central teeth group 211 in the thickness direction of the laminated core 2. tmag = t1 = t2 is the case for the linear motor 300A of the comparative example shown in Figures 6 and 7. The vertical axis in Figure 9 shows the cogging thrust. Cogging thrust is the pulsation of the magnetic attraction force between the secondary magnetic poles 200 and the teeth portion of the primary armature 100. Cogging thrust occurs when the magnetic flux generated in the magnetic air gap changes abruptly due to the difference between the length of the secondary magnetic pole 200 in the thickness direction of the laminated core 2 and the length of the teeth portion 21a of the end teeth group 210 of the primary armature 100 in the thickness direction of the laminated core 2. Therefore, by reducing the difference between the length tmag of the secondary magnetic pole 200 in the thickness direction of the laminated core 2 and the length t1 of the teeth portion 21a of the end teeth group 210, the magnetic flux generated in the magnetic air gap becomes smoother, and cogging thrust is reduced. In order to improve the positioning accuracy of the linear motor 300, it is desirable to have low cogging thrust.

[0034] As shown in Figures 8 and 9, when tmag = t1 and t1 < t2, the effect of improving thrust while suppressing the increase in cogging thrust can be obtained. Furthermore, when tmag = t1 and t1 < t2, it is possible to reduce the current for the same number of turns with respect to the desired thrust, thereby improving power efficiency.

[0035] Embodiment 2. Next, a linear motor 301 according to Embodiment 2 will be described. Note that components identical to those in Embodiment 1 are denoted by the same reference numerals, and their descriptions are omitted as appropriate. Figure 10 is a perspective view showing a linear motor according to Embodiment 2. Figure 11 is a perspective view showing the armature module of the linear motor according to Embodiment 2, with the fixing members removed. Figure 12 is a bottom view showing the armature module of the linear motor according to Embodiment 2, with the fixing members removed.

[0036] As shown in Figures 10 and 11, the linear motor 301 according to Embodiment 2 comprises a primary armature 101 and secondary magnetic poles 200. The secondary magnetic poles 200 in the range opposite to the armature module 11 are, for example, composed of a 3-phase mixed winding with a combination of 4 poles and 5 slots. However, the secondary magnetic poles 200 in the range opposite to the armature module 11 are not limited to a 3-phase mixed winding with a combination of 4 poles and 5 slots, but may also be concentrated windings. The primary armature 101 and the secondary magnetic poles 200 are arranged facing each other with a predetermined magnetic gap between them. The primary armature 101 is movable relative to the secondary magnetic poles 200 in the direction of travel.

[0037] The primary armature 101 has at least one armature module 11. In the linear motor 301 according to Embodiment 2, the configuration of the armature module 11 differs from the configuration of the armature module 1 in Embodiment 1. As shown in Figures 11 and 12, each end tooth group 210 is composed of, for example, one tooth section 21a. The central tooth group 211 is composed of, for example, three tooth sections 21b. Of the end tooth groups 210 and the central tooth group 211, at least one tooth group has two or more teeth sections arranged consecutively in the direction of travel of the primary armature 101.

[0038] Among the teeth portions 21a of the end teeth group 210, the length t1 of the teeth portion 21a that has the maximum length in the stacking thickness direction of the laminated iron core 2 ｍａｘ This refers to the length t2 of the tooth portion 21b of the central tooth group 211 that has the maximum length in the stacking thickness direction of the laminated iron core 2. ｍａｘ Smaller than. Preferably, among the teeth portions 21a of the end teeth group 210, the length t1 of the teeth portion 21a that has the maximum length in the stacking thickness direction of the laminated iron core 2. ｍａｘ The length t2 of the tooth portion 21b of the central tooth group 211 is the length of the tooth portion 21b that has the minimum length in the thickness direction of the laminated iron core 2. ｍｉｎ It is smaller than . In the case shown in Figures 11 and 12, each end tooth group 210 has one tooth portion 21a, and the central tooth group 211 has three tooth portions 21b. Each tooth portion 21b of the central tooth group 211 is all the same length t2. Therefore, the length t1 of the tooth portion 21a of the end tooth group 210 in the stacking thickness direction of the laminated core 2 is smaller than the length t2 of the tooth portion 21b of the central tooth group 211 in the stacking thickness direction of the laminated core 2. As a result, as shown in Figures 11 and 12, the difference between the length t1 of the tooth portion 21a of the end tooth group 210 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 allows for the formation of space for arranging electrical circuit connection portions 4 at both ends of the end tooth group 210 in the stacking thickness direction of the laminated core 2.

[0039] As shown in Figures 11 and 12, the electrical circuit connection portion 4 is located at both ends of the end teeth group 210 in the thickness direction of the laminated core 2, and is positioned opposite the coil ends 30 of the coil wound around the teeth portion 21a. The connection structure portion 5 is located at both ends of the central teeth group 211 in the thickness direction of the laminated core 2, and is positioned opposite the coil ends 30 of the coil wound around the teeth portion 21b.

[0040] As shown in Figures 11 and 12, in the linear motor 301 according to Embodiment 2, the electrical circuit connection portion 4 is arranged 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 each tooth portion 21b of the central tooth group 211 in the stacking thickness direction of the laminated core 2. This allows a part of the electrical circuit connection portion 4 to be placed inside the actual outer shape 7, thereby suppressing an increase in the volume of the encompassing outer shape 8, and thus suppressing a decrease in thrust relative to the encompassing outer shape 8. Although not shown in the figures, all of the electrical circuit connection portion 4 may also be placed inside the actual outer shape 7 of the armature module 11.

[0041] Furthermore, in the linear motor 301 according to Embodiment 2, the length t1 of the tooth portion 21a of the end tooth group 210 is the length of the tooth portion 21a that has the maximum length in the stacking thickness direction of the laminated iron core 2. ｍａｘ However, among the teeth portions 21b of the central teeth group 211, the length t2 of the teeth portion 21b that has the maximum length in the stacking thickness direction of the laminated iron core 2 ｍａｘ It is smaller than that. In other words, in the linear motor 301 according to Embodiment 2, the stacking thickness of the tooth portion 21b of the central tooth group 211, which is the portion where the electrical circuit connection portion 4 is not located, is increased. As a result, for example, compared to the case where all the tooth portions are the length t1 of the tooth portion 21a of the end tooth group 210, the flux linked with the secondary magnetic pole 200 can be increased. In other words, the induced power can be increased, and the thrust relative to the overall shape can be increased.

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

[0043] Furthermore, in linear motors, the higher the desired thrust, the greater the required current, and the larger the electrical circuit connection section becomes. In the linear motor 301 according to Embodiment 2, the electrical circuit connection sections 4 are arranged separately on both sides of the end teeth group 210 in the thickness direction of the laminated core 2, so that the current flowing through each electrical circuit connection section 4 can be reduced. As a result, the size of each electrical circuit connection section 4 can be reduced.

[0044] Embodiment 3. Next, a linear motor 302 according to Embodiment 3 will be described. Note that components identical to those in Embodiment 1 are denoted by the same reference numerals, and their descriptions are omitted as appropriate. Figure 13 is a perspective view showing the linear motor according to Embodiment 3. Figure 14 is a perspective view showing the armature module of the linear motor according to Embodiment 3, with the fixing members removed. Figure 15 is a bottom view showing the armature module of the linear motor according to Embodiment 3, with the fixing members removed.

[0045] As shown in Figure 13, the linear motor 302 according to Embodiment 3 comprises a primary armature 102 and secondary magnetic poles 200. The secondary magnetic poles 200 in the range opposite to the armature module 12 are, for example, composed of a 3-phase mixed winding with a combination of 4 poles and 5 slots. However, the secondary magnetic poles 200 in the range opposite to the armature module 12 are not limited to a 3-phase mixed winding with a combination of 4 poles and 5 slots, but may also be concentrated windings. The primary armature 102 and the secondary magnetic poles 200 are arranged facing each other with a predetermined magnetic gap between them. The primary armature 102 is movable relative to the secondary magnetic poles 200 in the direction of travel.

[0046] The primary armature 102 has at least one armature module 12. In the linear motor 302 according to Embodiment 3, the configuration of the armature module 12 differs from the configuration of the armature module 1 in Embodiment 1. As shown in Figures 14 and 15, each end tooth group 210 is composed of, for example, two tooth sections 21a. The central tooth group 211 is composed of, for example, one tooth section 21b. Of the end tooth groups 210 and the central tooth group 211, at least one tooth group has two or more teeth sections arranged consecutively in the direction of travel of the primary armature 102. Since the linear motor 302 has two or more teeth sections 21a arranged consecutively in the end tooth groups 210, the space for arranging the electrical circuit connection section 4 can be increased, and the size restrictions of the electrical circuit connection section 4 can be relaxed. That is, even if a large electrical circuit connection section 4 is arranged, the overall external dimensions can be reduced.

[0047] Among the teeth portions 21a of the end teeth group 210, the length t1 of the teeth portion 21a that has the maximum length in the stacking thickness direction of the laminated iron core 2 ｍａｘ This refers to the length t2 of the tooth portion 21b of the central tooth group 211 that has the maximum length in the stacking thickness direction of the laminated iron core 2. ｍａｘ Smaller than. Preferably, among the teeth portions 21a of the end teeth group 210, the length t1 of the teeth portion 21a that has the maximum length in the stacking thickness direction of the laminated iron core 2. ｍａｘ The length t2 of the tooth portion 21b of the central tooth group 211 is the length of the tooth portion 21b that has the minimum length in the thickness direction of the laminated iron core 2. ｍｉｎ It is smaller than . In the case shown in Figures 14 and 15, the end teeth group 210 has two teeth portions 21a, and the central teeth group 211 has one tooth portion 21b. The two teeth portions 21a of the end teeth group 210 have different lengths in the stacking thickness direction of the laminated core 2. Therefore, the length t1 of the teeth portion 21a of the end teeth group 210 in the stacking thickness direction of the laminated core 2 ｍａｘThis is 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 Figures 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 this 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 for the formation of space for arranging the electrical circuit connection portion 4 on one end side of the end tooth group 210 in the thickness direction of the laminated core 2.

[0048] As shown in Figures 14 and 15, the electrical circuit connection portion 4 is located at one end of the end teeth group 210 in the thickness direction of the laminated iron core 2, and is positioned opposite the coil end 30 of the coil wound around the teeth portion 21a. The connection structure portion 5 is located at one end of the central teeth group 211 in the thickness direction of the laminated iron core 2, and is positioned opposite the coil end 30 of the coil wound around the teeth portion 21b.

[0049] As shown in Figures 14 and 15, in the linear motor 302 according to Embodiment 3, the lengths t1, t1 of the teeth portion 21a of the end teeth group 210 in the thickness direction of the laminated core 2 ｍａｘ The electrical circuit connection section 4 is positioned in the space formed by the difference in length t2 between the central teeth group 211 and each tooth portion 21b in the stacking thickness direction of the laminated iron core 2. This allows the electrical circuit connection section 4 to be positioned inside the actual outer shape 7, thereby suppressing an increase in the volume of the encompassing outer shape, and thus suppressing a decrease in thrust relative to the encompassing outer shape. Although not shown in the figures, at least a portion of the electrical circuit connection section 4 may be positioned inside the actual outer shape 7 of the armature module 12.

[0050] Furthermore, in the linear motor 302 according to Embodiment 3, the length t1 of the tooth portion 21a of the end tooth group 210 is the length of the tooth portion 21a that has the maximum length in the stacking thickness direction of the laminated iron core 2. ｍａｘ However, among the teeth portions 21b of the central teeth group 211, the length t2 of the teeth portion 21b that has the maximum length in the stacking thickness direction of the laminated iron core 2 ｍａｘIt is smaller than that. In other words, in the linear motor 302 according to Embodiment 3, the stacking thickness of the tooth portion 21b of the central tooth group 211, which is the portion where the electrical circuit connection portion 4 is not located, is increased. As a result, for example, compared to the case where all the tooth portions are the length t1 of the tooth portion 21a of the end tooth group 210, the flux linked with the secondary magnetic pole 200 can be increased. That is, the induced power can be increased, and the thrust relative to the overall shape can be increased.

[0051] Furthermore, in linear motors, the higher the desired thrust, the greater the required current and the larger the electrical circuit connection section becomes. The linear motor 302 according to Embodiment 3 has a configuration in which two or more teeth 21a of different lengths are arranged in the thickness direction of the laminated iron core 2 to match the shape of the electrical circuit connection section 4. As a result, the induced power increases, and thus the thrust can be increased.

[0052] Embodiment 4. Next, a linear motor 303 according to Embodiment 4 will be described. Note that components identical to those in Embodiment 1 are denoted by the same reference numerals, and their descriptions are omitted as appropriate. Figure 16 is a cross-sectional view showing the linear motor according to Embodiment 4. Figure 17 is a bottom view of the armature module of the linear motor according to Embodiment 4, with the fixing members removed.

[0053] As shown in Figures 16 and 17, the linear motor 303 according to Embodiment 4 comprises a primary armature 103 and secondary magnetic poles 200. The secondary magnetic poles 200 in the range opposite to the armature module 13 are, for example, composed of a 3-phase mixed winding with a combination of 4 poles and 5 slots. However, the secondary magnetic poles 200 in the range opposite to the armature module 13 are not limited to a 3-phase mixed winding with a combination of 4 poles and 5 slots, but may also be concentrated windings. The primary armature 103 and the secondary magnetic poles 200 are arranged facing each other with a predetermined magnetic gap between them. The primary armature 103 is movable relative to the secondary magnetic poles 200 in the direction of travel.

[0054] The primary armature 103 has at least one armature module 13. In the linear motor 303 according to Embodiment 4, the configuration of the armature module 13 differs from the configuration of the armature module 1 in Embodiment 1. As shown in Figures 16 and 17, each end tooth group 210 is composed of, for example, one tooth section 21a. The central tooth group 211 is composed of, for example, three tooth sections 21b. Of the end tooth groups 210 and the central tooth group 211, at least one tooth group has two or more teeth sections arranged consecutively in the direction of travel of the primary armature 103.

[0055] Among the teeth portions 21a of the end teeth group 210, the length t1 of the teeth portion 21a that has the maximum length in the stacking thickness direction of the laminated iron core 2 ｍａｘ This refers to the length t2 of the tooth portion 21b of the central tooth group 211 that has the maximum length in the stacking thickness direction of the laminated iron core 2. ｍａｘ Smaller than. Preferably, among the teeth portions 21a of the end teeth group 210, the length t1 of the teeth portion 21a that has the maximum length in the stacking thickness direction of the laminated iron core 2. ｍａｘ The length t2 of the tooth portion 21b of the central tooth group 211 is the length of the tooth portion 21b that has the minimum length in the thickness direction of the laminated iron core 2. ｍｉｎ It is smaller than . In the cases shown in Figures 16 and 17, each end tooth group 210 has one tooth portion 21a, and the central tooth group 211 has three tooth portions 21b. Each tooth portion 21b of the central tooth group 211 is the same length t2. Therefore, the length t1 of the tooth portion 21a of the end tooth group 210 in the stacking thickness direction of the laminated core 2 is smaller than the length t2 of the tooth portion 21b of the central tooth group 211 in the stacking thickness direction of the laminated core 2. As a result, as shown in Figure 17, the difference between the length t1 of the tooth portion 21a of the end tooth group 210 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 creates space for arranging the electrical circuit connection portion 4 on one end side of the end tooth group 210 in the stacking thickness direction of the laminated core 2.

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

[0057] As shown in Figure 17, the electrical circuit connection portion 4 is located at one end of the end teeth group 210 in the thickness direction of the laminated iron core 2, and is positioned opposite the coil end 30 of the coil wound around the teeth portion 21a. The connection structure portion 5 is located at one end of the central teeth group 211 in the thickness direction of the laminated iron core 2, and is positioned opposite the coil end 30 of the coil wound around the teeth portion 21b.

[0058] As shown in Figures 16 and 17, in the linear motor 303 according to Embodiment 4, the electrical circuit connection portion 4 is positioned 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 each tooth portion 21b of the central tooth group 211 in the stacking thickness direction of the laminated core 2. This allows the electrical circuit connection portion 4 to be positioned inside the actual outer shape 7, thereby suppressing an increase in the volume of the encompassing outer shape, and thus suppressing a decrease in thrust relative to the encompassing outer shape. Although not shown in the figures, at least a part of the electrical circuit connection portion 4 may be positioned inside the actual outer shape 7 of the armature module 13.

[0059] Furthermore, in the linear motor 303 according to Embodiment 4, the length t1 of the tooth portion 21a of the end tooth group 210 is the length of the tooth portion 21a that has the maximum length in the stacking thickness direction of the laminated iron core 2. ｍａｘHowever, among the teeth portions 21b of the central teeth group 211, the length t2 of the teeth portion 21b that has the maximum length in the stacking thickness direction of the laminated iron core 2 ｍａｘ It is smaller than that. In other words, in the linear motor 303 according to Embodiment 4, the stacking thickness of the tooth portion 21b of the central tooth group 211, which is the portion where the electrical circuit connection portion 4 is not located, is increased. As a result, for example, compared to the case where all the tooth portions are the length t1 of the tooth portion 21a of the end tooth group 210, the flux linked with the secondary magnetic pole 200 can be increased. That is, the induced power can be increased, and the thrust relative to the overall shape can be increased.

[0060] Furthermore, generally, the flux linkage of the teeth 21a and 21b is proportional to the area of ​​the tip surface facing the secondary magnetic pole 200. Therefore, if the length of the teeth 21a of the end teeth group 210 in the thickness direction of the laminated core 2 is short, the flux linkage between the teeth 21a and the secondary magnetic pole 200 decreases, and the induced voltage decreases. Also, the cogging thrust increases due to the difference between the length tmag of the secondary magnetic pole 200 in the thickness direction of the laminated core 2 and the length t1 of the teeth 21a of the end teeth group 210. Therefore, in the linear motor 303 according to Embodiment 4, the size of the area S1 of the tip surface of the teeth 21a of the end teeth group 210 facing the secondary magnetic pole 200 is set to be greater than or equal to the size of the area S2 of the tip surface of the teeth 21b of the central teeth group 211 facing the secondary magnetic pole 200. As a result, the linear motor 303 according to Embodiment 4 can increase the flux linkage between the teeth portion 21a of the end teeth group 210 and the secondary magnetic pole 200. This can increase the induced power and thus increase the thrust. Furthermore, in the linear motor 303 according to Embodiment 4, the magnetic flux generated in the magnetic gap at the teeth portion 21a becomes smoother, thus reducing the cogging thrust of the slot order component or the pole slot order component.

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

[0062] Embodiment 5. Next, a linear motor 304 according to Embodiment 5 will be described. Note that components identical to those in Embodiment 1 are denoted by the same reference numerals, and their descriptions are omitted as appropriate. Figure 18 is a cross-sectional view showing the linear motor according to Embodiment 5. Figure 19 is a bottom view of the armature module of the linear motor according to Embodiment 5, with the fixing members removed.

[0063] As shown in Figures 18 and 19, the linear motor 304 according to Embodiment 5 comprises a primary armature 104 and secondary magnetic poles 200. The secondary magnetic poles 200 in the range opposite to the armature module 14 are, for example, composed of a 3-phase mixed winding with a combination of 4 poles and 5 slots. However, the secondary magnetic poles 200 in the range opposite to the armature module 14 are not limited to a 3-phase mixed winding with a combination of 4 poles and 5 slots, but may also be concentrated windings. The primary armature 104 and the secondary magnetic poles 200 are arranged facing each other with a predetermined magnetic gap between them. The primary armature 104 is movable relative to the secondary magnetic poles 200 in the direction of travel.

[0064] The primary armature 104 has at least one armature module 14. In the linear motor 304 according to Embodiment 5, the configuration of the armature module 14 differs from the configuration of the armature module 1 in Embodiment 1. As shown in Figures 18 and 19, each end tooth group 210 is composed of, for example, one tooth section 21a. The central tooth group 211 is composed of, for example, three tooth sections 21b. Of the end tooth groups 210 and the central tooth group 211, at least one tooth group has two or more teeth sections arranged consecutively in the direction of travel of the primary armature 104.

[0065] Among the teeth portions 21a of the end teeth group 210, the length t1 of the teeth portion 21a that has the maximum length in the stacking thickness direction of the laminated iron core 2 ｍａｘ This refers to the length t2 of the tooth portion 21b of the central tooth group 211 that has the maximum length in the stacking thickness direction of the laminated iron core 2. ｍａｘ Smaller than. Preferably, among the teeth portions 21a of the end teeth group 210, the length t1 of the teeth portion 21a that has the maximum length in the stacking thickness direction of the laminated iron core 2. ｍａｘ The length t2 of the tooth portion 21b of the central tooth group 211 is the length of the tooth portion 21b that has the minimum length in the thickness direction of the laminated iron core 2. ｍｉｎ It is smaller than . In the cases shown in Figures 18 and 19, each end tooth group 210 has one tooth portion 21a, and the central tooth group 211 has three tooth portions 21b. Each tooth portion 21b of the central tooth group 211 is the same length t2. Therefore, the length t1 of the tooth portion 21a of the end tooth group 210 in the stacking thickness direction of the laminated core 2 is smaller than the length t2 of the tooth portion 21b of the central tooth group 211 in the stacking thickness direction of the laminated core 2. As a result, as shown in Figure 19, the difference between the length t1 of the tooth portion 21a of the end tooth group 210 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 creates space for arranging the electrical circuit connection portion 4 on one end side of the end tooth group 210 in the stacking thickness direction of the laminated core 2.

[0066] Furthermore, the number of turns of the coil wound around each tooth portion 21a of the end tooth group 210 is greater than the number of turns of the coil wound around each tooth portion 21b of the central tooth group 211. Note that if either of the tooth portions 21a or 21b is a multiphase winding, the number of turns of the coil in the multiphase winding tooth portion is the sum of the turns of the non-multiphase coils.

[0067] As shown in Figure 19, the electrical circuit connection portion 4 is located at one end of the end teeth group 210 in the thickness direction of the laminated core 2, and is positioned opposite the coil end 30 of the coil wound around the teeth portion 21a. The connection structure portion 5 is located at one end of the central teeth group 211 in the thickness direction of the laminated core 2, and is positioned opposite the coil end 30 of the coil wound around the teeth portion 21b.

[0068] As shown in Figures 18 and 19, in the linear motor 304 according to Embodiment 5, the electrical circuit connection portion 4 is positioned in the space formed by the difference between the length t1 of the tooth portion 21a of the end tooth group 210 in the thickness direction of the laminated core 2 and the length t2 of each tooth portion 21b of the central tooth group 211 in the thickness direction of the laminated core 2. This allows the electrical circuit connection portion 4 to be positioned inside the actual outer shape 7, thereby suppressing an increase in the volume of the encompassing outer shape, and thus suppressing a decrease in thrust relative to the encompassing outer shape. Although not shown in the figures, at least a part of the electrical circuit connection portion 4 may be positioned inside the actual outer shape 7 of the armature module 14.

[0069] Furthermore, in the linear motor 304 according to Embodiment 5, the length t1 of the tooth portion 21a of the end tooth group 210 is the length of the tooth portion 21a that has the maximum length in the thickness direction of the laminated core 2. ｍａｘ However, among the teeth portions 21b of the central teeth group 211, the length t2 of the teeth portion 21b that has the maximum length in the stacking thickness direction of the laminated iron core 2 ｍａｘIt is smaller than that. In other words, in the linear motor 304 according to Embodiment 5, the stacking thickness of the tooth portion 21b of the central tooth group 211, which is the portion where the electrical circuit connection portion 4 is not located, is increased. As a result, for example, compared to the case where all the tooth portions are the length t1 of the tooth portion 21a of the end tooth group 210, the flux linked with the secondary magnetic pole 200 can be increased. That is, the induced power can be increased, and the thrust relative to the overall shape can be increased.

[0070] Furthermore, the flux linkage of the teeth 21a and 21b is proportional to the area of ​​the tip surface facing the secondary magnetic pole 200. Therefore, in the end teeth group 210, where the length in the stacking thickness direction of the laminated core 2 is short, the 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 coils wound around the teeth 21a and 21b. In the linear motor 304 according to Embodiment 5, the number of turns of the coils wound around each tooth 21a of the end teeth group 210 is greater than the number of turns of the coils wound around each tooth 21b of the central teeth group 211. Therefore, the induced voltage in the end teeth group 210 can be increased, and the thrust can be improved. Thus, by adjusting the lengths of the teeth 21a of the end teeth group 210 and the teeth 21b of the central teeth group 211 in the thickness direction of the laminated core 2, and the number of turns of the coil wound around each tooth 21a of the end teeth group 210 and each tooth 21b of the central teeth group 211, a higher effect can be obtained. Furthermore, since the induced voltage constants of each tooth 21a and 21b can be balanced, thrust ripple can be reduced. Similar effects can be obtained in multiphase windings where different phase coils are wound around the same tooth 21a and 21b.

[0071] The configurations shown in the above embodiments are merely examples and can be combined with other known technologies, or the embodiments themselves can be combined. Furthermore, it is possible to omit or modify parts of the configuration without departing from the gist of the invention.

[0072] 1, 1A, 11, 12, 13, 14 Armature module, 2, 2A Laminated iron core, 3, 3A Coil group, 4, 4A Electrical circuit connection part, 5, 5A Wiring structure part, 6, 6A Fixing member, 7, 7A Actual outer shape, 8, 8A Enclosed outer shape, 20 Core back part, 21, 21A Teeth group, 21a, 21b Teeth part, 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 Central teeth group, 300, 300A, 301, 302, 303, 304 Linear motor.

Claims

1. 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, wherein the armature module comprises a laminated core having a core back portion extending in the direction of travel of the primary armature, and a group of teeth 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 group of coils consisting of a plurality of coils wound around each of the teeth of the group of teeth, an electrical circuit connection portion arranged at the end of the group of teeth in the thickness direction of the laminated core and connecting adjacent armature modules in the direction of travel of the primary armature, and a connection structure portion that electrically connects the group of coils and the electrical circuit connection portion. The teeth group comprises an end teeth group consisting of one or more tooth portions located on both sides of the primary armature's direction of travel, and a central teeth group consisting of one or more tooth portions excluding the end teeth group, wherein at least one of the end teeth group and the central teeth group has two or more teeth portions arranged consecutively along the direction of travel of the primary armature, and the length of the tooth portion in the end teeth group that has the maximum length in the stacking thickness direction of the laminated core is smaller than the length of the tooth portion in the central teeth group that has the maximum length in the stacking thickness direction of the laminated core. A linear motor characterized in that 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 teeth portion of the end teeth group in the stacking thickness direction of the laminated core and the length of the teeth 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 encompasses the portion of the armature module excluding the electrical circuit connection portion.

2. The linear motor according to claim 1, characterized in that, among the teeth portions of the end teeth group, the length of the tooth portion having the maximum length in the thickness direction of the laminated core is smaller than the length of the tooth portion having the minimum length in the thickness direction of the laminated core among the teeth portions of the central teeth group.

3. The linear motor according to claim 1 or 2, characterized in that the central tooth group has two or more tooth portions, and the lengths of the tooth portions of the central tooth group in the stacking thickness direction of the laminated core are all the same.

4. The linear motor according to any one of claims 1 to 3, characterized in that the core back portion extends in the direction of travel of the primary armature and is divided into a plurality of parts along the direction of travel, and each of the teeth of the teeth group is provided on a divided piece of the divided core back portion.

5. The linear motor according to any one of claims 1 to 4, characterized in that the area of ​​the tip surface of the tooth portion of the end tooth group facing the secondary magnetic pole is greater than or equal to the area of ​​the tip surface of the tooth portion of the central tooth group facing the secondary magnetic pole.

6. The linear motor according to any one of claims 1 to 5, characterized in that the number of turns of the coil wound around each tooth of the end tooth group is greater than the number of turns of the coil wound around each tooth of the central tooth group.

7. The linear motor according to any one of claims 1 to 6, characterized in that the length of the secondary magnetic pole in the stacking thickness direction of the laminated core is equal to or greater than the length of the tooth portion of the end tooth group that has the minimum length in the stacking thickness direction of the laminated core.

8. The linear motor according to any one of claims 1 to 7, characterized in that the length of the secondary magnetic pole in the stacking thickness direction of the laminated core is less than or equal to the length of the tooth portion of the central tooth group that has the maximum length in the stacking thickness direction of the laminated core.

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