Armature and linear motor

Abstract

The armature (2) includes an iron core (3) having a core back (30) and a plurality of teeth (31) extending from the core back (30) toward the field magnet (1), an insulator (4) provided on the iron core (3), a coil (5) wound around the teeth (31) via the insulator (4), a resin mold (6) sealing the periphery of the core back (30) and the teeth (31), and a temperature detection member (7) for detecting the temperature of heat generated inside the resin mold (6). The resin mold (6) has an accommodation groove (61) formed on its top surface (60) facing the mounting destination (300) for accommodating the temperature detection member (7). The temperature detection member (7) is accommodated in the accommodation groove (61), and is sandwiched and fixed between the mounting destination (300) and the resin mold (6) when the armature (2) is attached to the mounting destination (300).

Description

[Technical Field]

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

[0002] Conventionally, electric motors equipped with a temperature detection member for detecting temperature have been known. For example, the electric motor disclosed in Patent Document 1 includes a stator integrally molded with a resin mold, a rotor, and a shaft rotatably fixed to the rotor. The shaft is supported by a bearing held by a bracket. A recess is formed on the side of the resin mold to accommodate an overheat prevention device. The overheat prevention device housed in the recess is held by the bracket to prevent it from protruding from the recess. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 07-312850 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the technology disclosed in Patent Document 1, if the overtemperature protection device needs to be replaced due to, for example, a malfunction, it is necessary to disassemble the motor, remove the bracket, and then remove the overtemperature protection device. Generally, users are prohibited from disassembling electric motors, which are products, and disassembling the motor voids the manufacturer's warranty. Therefore, the user must send the motor to the manufacturer, where the overtemperature protection device is replaced, which can result in a very long lead time.

[0005] The present disclosure has been made in view of the above, and has an object to provide an armature in which a temperature detection member can be easily attached or detached. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the armature according to the present disclosure is an armature that is arranged facing a field magnet across an air gap when attached to a mounting target and is movable relative to the field magnet, and includes an iron core having a core back extending in the direction of movement and a plurality of teeth arranged in parallel along the direction of movement and extending from the core back toward the field magnet, an insulator provided on the iron core, coils wound around the teeth via the insulator, a resin mold having an upper surface facing the mounting target and sealing the periphery of the core back and the teeth, and a temperature detection member that detects the temperature of heat generated inside the resin mold. The resin mold has an accommodation groove formed on its upper surface facing the mounting target for accommodating the temperature detection member. The temperature detection member is accommodated in the accommodation groove and is fixed by being sandwiched between the mounting target and the resin mold when the armature is attached to the mounting target. [Effects of the Invention]

[0007] The armature according to the present disclosure has the advantage that the temperature detection member can be easily attached or detached. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view schematically showing a linear motor according to a first embodiment; [Figure 2] FIG. 1 is a perspective view schematically showing an armature that constitutes a linear motor according to a first embodiment; [Figure 3] FIG. 1 is a top view schematically showing an armature that constitutes a linear motor according to a first embodiment; [Figure 4] Cross-sectional view taken along the line IV-IV in Figure 3 [Figure 5] An enlarged cross-sectional view of the V portion of FIG. 1 taken from the x direction. [Figure 6] FIG. 10 is a perspective view schematically showing a modified example of an armature that configures the linear motor according to the first embodiment; [Figure 7] FIG. 10 is a front view schematically showing a linear motor according to a second embodiment; [Figure 8]8 is an enlarged cross-sectional view of a main part of FIG. 7 showing part VIII in the x direction; [Figure 9] FIG. 10 is an enlarged cross-sectional view of a main portion of a modified example of an armature constituting the linear motor according to the second embodiment; [Figure 10] FIG. 10 is a perspective view of a pressing member used in a modified example of an armature constituting the linear motor according to the second embodiment; [Figure 11] FIG. 11 is a perspective view schematically showing an armature that constitutes a linear motor according to a third embodiment. [Figure 12] FIG. 11 is a plan view schematically showing a modified example of an armature constituting the linear motor according to the third embodiment; DETAILED DESCRIPTION OF THE INVENTION

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

[0010] Embodiment 1 FIG. 1 is a front view schematically illustrating a linear motor according to a first embodiment. FIG. 1 illustrates a linear motor 100 mounted on a base member 200 and a mounting location 300. As shown in FIG. 1, the linear motor 100 includes a field 1 and an armature 2 that is disposed opposite the field 1 via an air gap and is movable relative to the field 1. As shown in FIG. 1, in the linear motor 100, the field 1 is mounted on the base member 200, and the armature 2 is mounted on the mounting location 300. The base member 200 has a bottom surface portion 200a that extends along the direction of travel of the armature 2 (y direction), and side surface portions 200b that rise upward from both side edges of the bottom surface portion 200a and extend along the direction of travel of the armature 2 (y direction), and has a concave cross-sectional shape. Rail members 200c are provided on the upper surfaces of the side surface portions 200b along the direction of travel of the armature 2 (y direction). The attachment 300 is, for example, a user's device, a slider mechanism, or a gantry mechanism configured in combination with the base member 200. The attachment 300 is provided with a plate-shaped portion 300a to which the armature 2 is attached, and a guide portion 300b such as a bearing attached to the plate-shaped portion 300a and movably fitted into the rail member 200c.

[0011] The field magnet 1 includes a mounting seat 10 and a plurality of permanent magnets 11 whose south and north poles are arranged alternately along the direction of travel (y direction) of the armature 2. The mounting seat 10 is fixed to the upper surface of a bottom surface portion 200a, which is the inner bottom surface of the base member 200, using a joining member such as a bolt. The permanent magnets 11 are provided on the upper surface of the mounting seat 10. The armature 2 is attached to a plate-shaped portion 300a provided on the attachment 300. An object 400 to be transported is placed on the upper surface of the plate-shaped portion 300a.

[0012] Fig. 2 is a perspective view schematically showing an armature constituting the linear motor according to the first embodiment. Fig. 3 is a top view schematically showing an armature constituting the linear motor according to the first embodiment. Fig. 4 is a cross-sectional view taken along the line IV-IV shown in Fig. 3. As shown in Figs. 2 to 4, the armature 2 includes an iron core 3, an insulator 4, a coil 5, a resin mold 6, and a temperature detection member 7.

[0013] The iron core 3 is formed by laminating a plurality of iron core pieces, for example, thin electromagnetic steel sheets, which are magnetic materials, into one layer. As shown in FIG. 4, the iron core 3 includes a core back 30 and a plurality of teeth 31. The core back 30 extends in the direction of travel (y direction) of the armature 2, and its upper surface 30a is attached to a plate-shaped portion 300a of the attachment 300 using a joining member such as a bolt. As shown in FIGS. 2 and 3, a plurality of screw holes 32 are formed in the upper surface 30a of the core back 30 for attachment to the plate-shaped portion 300a of the attachment 300. As shown in FIG. 4, the core back 30 is divided into a plurality of pieces along the direction of travel (y direction). The plurality of teeth 31 are arranged in parallel along the direction of travel (y direction) of the armature 2 and extend from the core back 30 toward the field 1. Each tooth 31 is provided on one of the divided pieces of the core back 30. The tip surfaces 31a of the teeth 31 face the field 1. The core back 30 is not limited to being divided in the direction of travel (y direction) of the armature 2, but may be an integrated structure without being divided. If the core back 30 is not divided, no gaps will be generated in the divided parts, thereby improving the output of the motor.

[0014] The insulator 4 is provided on the iron core 3 to ensure electrical insulation between the iron core 3 and the coil 5. This is because contact between the iron core 3 and the coil 5 causes a ground fault. The insulator 4 is made of a material with excellent electrical insulation properties, such as polyimide, polyethylene terephthalate (PET), polyphenylene sulfide (PPS), or polybutylene terephthalate (PBT).

[0015] The coil 5 is formed by winding a conductive wire made of, for example, copper or aluminum around each tooth 31 with an insulator 4 interposed therebetween.

[0016] As shown in FIGS. 2 to 4 , the resin mold 6 has an upper surface 60 facing the attachment destination 300, and seals the peripheries of the core back 30 and the teeth 31 while leaving the upper surface 30a of the core back 30 and the tip surfaces 31a of the teeth 31 facing the field magnet 1 exposed. However, the resin mold 6 may be thinly adhered to the tip surfaces 31a of the teeth 31 facing the field magnet 1. In some cases, the resin mold 6 seals the entire periphery, including the upper surface 30a of the core back 30 and the tip surfaces 31a of the teeth 31 facing the field magnet 1. The resin mold 6 has a concave accommodation groove 61 for accommodating the temperature detection member 7 formed on the upper surface 60 facing the attachment destination 300, adjacent to the upper surface 30a of the core back 30. The accommodation groove 61 is, for example, a rectangular groove that matches the shape of the temperature detection member 7.

[0017] Fig. 5 is an enlarged cross-sectional view of a main part of portion V in Fig. 1, taken from the x direction. As shown in Fig. 5, the housing groove 61 has a first groove portion 61a formed by cutting out the upper surface 60 of the resin mold 6, and a second groove portion 61b recessed further from the first groove portion 61a, and is configured so that the size of the groove gradually decreases downward. The dashed dotted line in Fig. 5 indicates the boundary between the first groove portion 61a and the second groove portion 61b.

[0018] The upper part of the temperature detection member 7 is disposed in the first groove 61a. The first groove 61a is formed by opening one of both end faces of the resin mold 6 aligned in the direction of travel of the armature 2 (y direction). That is, the first groove 61a has one opening 62 and is a recessed shape surrounded by three walls. The opening 62 of the first groove 61a is used to draw out the lead wire 7a of the temperature detection member 7. Note that the first groove 61a has the opening 62 for drawing out the lead wire 7a formed in the end face of the resin mold 6 aligned in the direction of travel of the armature 2 (y direction). However, if the lead wire 7a is to be drawn out from the end face of the resin mold 6 aligned in the direction perpendicular to the direction of travel of the armature 2 (x direction), an opening may be formed in the end face of the resin mold 6 aligned in the perpendicular direction (x direction).

[0019] The second groove 61b is formed within the size range of the first groove 61a and has a recessed shape surrounded by four walls. The lower part of the temperature detection member 7 is fitted into the second groove 61b. A step 63 formed by the difference in size between the first groove 61a and the second groove 61b is provided where the opening 62 of the first groove 61a is formed. The step 63 has the function of hooking the temperature detection member 7 to prevent it from slipping out of the accommodating groove 61 to the outside of the resin mold 6, and also has the function of preventing the temperature detection member 7 from shifting position.

[0020] The accommodation groove 61 having the above configuration can be easily formed during the molding of the resin mold 6 by inserting a piece for forming the groove into the molding die for the resin mold 6. In other words, there is no need to prepare an additional process or additional parts for forming the accommodation groove 61. The accommodation groove 61 may also be formed by cutting after the resin mold 6 is molded. Furthermore, the accommodation groove 61 is not limited to the configuration shown in the figure, and may be, for example, a single rectangular groove portion or any other shape.

[0021] If the temperature detection member 7 is placed too close to the coil 5, there is a risk that the temperature detection member 7 may short-circuit and break down. Therefore, the depth H of the accommodating groove 61, which is the sum of the depths of the first groove portion 61a and the second groove portion 61b, is set to be smaller than the thickness t of the core back 30 shown in Fig. 4. This allows the temperature detection member 7 placed in the accommodating groove 61 to be placed at a position away from the coil 5, and the temperature detection member 7 can be insulated from the coil 5 to protect it.

[0022] The temperature detection member 7 detects the temperature of heat generated inside the resin mold 6. The temperature detection member 7 is, for example, a temperature sensor. The temperature detection member 7 is accommodated in the accommodation groove 61 so that a portion of the upper part protrudes from the upper surface 60 of the resin mold 6, with the lower part fitted in the second groove portion 61b and the upper part disposed in the first groove portion 61a. The temperature detection member 7 is positioned by fitting the lower part into the second groove portion 61b. The lead wires 7a of the temperature detection member 7 are drawn out from the opening 62 of the first groove portion 61a. The temperature detection member 7 is accommodated in the accommodation groove 61, and when the core back 30 is attached to the plate-shaped portion 300a of the attachment destination 300, the temperature detection member 7 is sandwiched and fixed between the plate-shaped portion 300a and the resin mold 6. The depth of the accommodation groove 61 and the thickness of the temperature detection member 7 are designed so that when the armature 2 is attached to the attachment 300 , the temperature detection member 7 is sandwiched and fixed between the attachment 300 and the resin mold 6 .

[0023] As described above, the armature 2 constituting the linear motor 100 according to the first embodiment includes the iron core 3 having the core back 30 extending in the direction of travel (y direction) and the plurality of teeth 31 arranged in parallel along the direction of travel (y direction) and extending from the core back 30 toward the field 1, the insulator 4 provided on the iron core 3, the coil 5 wound around the teeth 31 via the insulator 4, the resin mold 6 having the upper surface 60 facing the attachment 300 and sealing the periphery of the core back 30 and the teeth 31, and the temperature detecting member 7 for detecting the temperature of heat generated inside the resin mold 6. The resin mold 6 has an accommodating groove 61 formed on the upper surface 60 facing the attachment 300 to accommodate the temperature detecting member 7. The temperature detecting member 7 is accommodated in the accommodating groove 61, and is fixed by being sandwiched between the attachment 300 and the resin mold 6 when the armature 2 is attached to the attachment 300.

[0024] Therefore, when the armature 2 constituting the linear motor 100 according to the first embodiment is attached to the mounting location 300, the temperature detecting member 7 is sandwiched and fixed between the mounting location 300 and the resin mold 6. Therefore, the temperature detecting member 7 can be removed simply by removing the armature 2 from the mounting location 300. That is, there is no need to disassemble the components of the armature 2 to remove the temperature detecting member 7. In particular, if the temperature detecting member 7 breaks down, anyone can easily remove the temperature detecting member 7 and replace it with a new one without requiring specialized knowledge. In this way, even a user can easily attach or remove the temperature detecting member 7. Therefore, for example, if the temperature detecting member 7 breaks down, there is no need to replace the entire linear motor 100 or to request repairs from the manufacturer. Furthermore, the armature 2 according to the first embodiment does not require a part for holding the temperature detecting member 7 housed in the housing groove 61. This reduces the number of parts and simplifies manufacturing, thereby reducing material costs and processing costs.

[0025] The armature 2 in the first embodiment is not limited to a configuration in which the upper surface 30a of the core back 30 is attached to the plate-shaped portion 300a of the attachment portion 300. FIG. 6 is a perspective view schematically illustrating a modified example of the armature constituting the linear motor according to the first embodiment. As shown in FIG. 6, the armature 2 may be configured such that, for example, a fastening rod 33 extending along the direction of travel (y direction) of the armature 2 is provided on the upper surface 30a of the core back 30, and the fastening rod 33 is attached to the plate-shaped portion 300a of the attachment portion 300 using a joining member such as a bolt. The fastening rod 33 is made of, for example, the same material as the iron core 3. The fastening rod 33 is fitted into a recess formed in the upper surface 30a of the core back 30 and fixed by welding or the like. A plurality of screw holes 34 are formed on the upper surface of the fastening rod 33 for attachment to the plate-shaped portion 300a of the attachment portion 300. The fastening rod 33 is easier to design and machine than the core back 30 in terms of the screw holes 34, and a joining member screwed into the screw holes 34 can increase the fastening force between the fastening rod 33 and the attachment target 300. The fastening rod 33 is not limited to the rectangular parallelepiped shape shown in the figure, and may have other shapes as long as it is provided on the upper surface 30a of the core back 30 and can be attached to the plate-shaped portion 300a of the attachment target 300. The upper surface 30a of the core back 30 may be exposed or may be sealed by the resin mold 6. The temperature detection member 7 is accommodated in the accommodation groove 61, and when the fastening rod 33 is attached to the plate-shaped portion 300a of the attachment target 300, it is sandwiched and fixed between the plate-shaped portion 300a and the resin mold 6. Although not shown, the plate-shaped portion 300a may have, for example, a flat portion to which the fastening rod 33 is attached and a protruding portion protruding from the flat portion toward the upper surface 60 of the resin mold 6. The temperature detecting member 7 is sandwiched and fixed between the protruding portion and the resin mold 6 in a state where the fastening rod 33 is attached to the plate-shaped portion 300a.

[0026] Embodiment 2 Next, a linear motor 101 according to a second embodiment will be described. Note that the same components as those in the first embodiment will be assigned the same reference numerals, and their description will be omitted where appropriate. Fig. 7 is a front view schematically showing a linear motor according to the second embodiment. Fig. 8 is an enlarged cross-sectional view of a main part showing part VIII in Fig. 7 from the x direction. As shown in Figs. 7 and 8, the linear motor 101 according to the second embodiment differs from the linear motor 100 according to the first embodiment in the configuration of the temperature detection member 7A of the armature 2A. The other configurations are the same as those of the linear motor 100 according to the first embodiment.

[0027] As shown in FIGS. 7 and 8 , the temperature detection member 7A includes a sensor member 70 and a pressing member 71. The sensor member 70 is accommodated in the accommodation groove 61 and detects the temperature of heat generated inside the resin mold 6. The pressing member 71 is separate from the sensor member 70 and is disposed between the sensor member 70 and the attachment destination 300. The pressing member 71 is, for example, flat. The pressing member 71 is made of a material that is elastic and has low thermal conductivity. For example, silicone rubber is suitable for the pressing member 71, but other materials may also be used. The temperature detection member 7A is accommodated in the accommodation groove 61, and when the core back 30 is attached to the plate-shaped portion 300a of the attachment destination 300, the sensor member 70 and the pressing member 71 are sandwiched and fixed between the plate-shaped portion 300a and the resin mold 6. The thickness of the sensor member 70 , the thickness of the pressing member 71 , and the depth of the accommodation groove 61 are designed so that the sensor member 70 is fixed in close contact with the accommodation groove 61 .

[0028] In the armature 2A, it is desirable to fit the sensor member 70 into the accommodating groove 61 in order to accurately measure the temperature of the coil 5. In this case, the design of the depth of the accommodating groove 61 and the thickness of the sensor member 70 is very important, but there is a problem in that it is difficult to design the dimensional tolerances. For example, if the pressing member 71 is not provided and the accommodating groove 61 is shallow, when the armature 2A is attached to the attachment 300, a large pressure is applied to the sensor member 70 from the attachment 300, which may damage the sensor member 70. To address this issue, it is conceivable to make the accommodating groove 61 deeper, but this may prevent the sensor member 70 from being sandwiched between the attachment 300 and the resin mold 6. In this case, the sensor member 70 may become misaligned, making it impossible to accurately detect the heat inside the resin mold 6, or the sensor member 70 may slip out of the accommodating groove 61.

[0029] Therefore, in the armature 2A according to the second embodiment, the temperature detecting member 7A includes a sensor member 70 that detects the temperature of heat generated inside the resin mold 6, and a pressing member 71 that is separate from the sensor member 70 and has elasticity and is disposed between the sensor member 70 and the mounting destination 300. That is, in the armature 2A according to the second embodiment, the temperature detecting member 7A is sandwiched and fixed between the mounting destination 300 and the resin mold 6, with the pressing member 71 pressing the sensor member 70. In the armature 2A according to the second embodiment, it is only necessary to use a pressing member 71 that matches the dimensions of the depth of the accommodating groove 61 and the thickness of the sensor member 70, which makes it very easy to design the depth of the accommodating groove 61 and the thickness of the sensor member 70. That is, even if the depth of the accommodating groove 61 is designed to be slightly shallow or a thick sensor member 70 is selected, resulting in a slight error in the distance from the bottom surface of the accommodating groove 61 to the mounting surface of the mounting destination 300, by sandwiching the sensor member 70 together with the elastic pressing member 71, the elasticity of the pressing member 71 can absorb the dimensional error, allowing the sensor member 70 to be tightly attached to the accommodating groove 61. Furthermore, because the elastic force of the pressing member 71 absorbs the dimensional error, it is easy to design the depth tolerance of the accommodating groove 61 and the thickness tolerance of the sensor member 70, and these tolerances can be set to be wide. Furthermore, the elasticity of the pressing member 71 reduces the stress acting on the sensor member 70, preventing failure of the sensor member 70 when the temperature detection member 7A is fixed. It is desirable to design the thickness of the pressing member 71 to be thick enough to firmly attach the sensor member 70 to the accommodating groove 61 and to prevent failure of the sensor member 70, taking into consideration the distance from the plate-like portion 300a of the attachment destination 300 to the inner bottom surface of the accommodating groove 61 and the thickness of the sensor member 70.

[0030] Furthermore, by making the pressing member 71 out of a material with a lower thermal conductivity than the attachment destination 300, it is possible to suppress heat transfer from the attachment destination 300 to the sensor member 70. Furthermore, the pressing member 71 can prevent heat from the accommodating groove 61 and the sensor member 70 from leaking to the attachment destination 300. As a result, it is possible to improve the measurement accuracy of the sensor member 70. Furthermore, by using an elastic material such as silicone rubber for the pressing member 71, the coefficient of friction becomes large, making it possible to suppress displacement of the sensor member 70 while the linear motor 100 is in operation.

[0031] FIG. 9 is an enlarged cross-sectional view of a main portion of a modified armature constituting the linear motor according to the second embodiment. FIG. 10 is a perspective view of a pressing member used in the modified armature constituting the linear motor according to the second embodiment. The armature 2A shown in FIG. 9 differs from the configurations shown in FIGS. 7 and 8 in the configuration of the pressing member 71. As shown in FIGS. 9 and 10, the pressing member 71 has a concave shape and includes a rectangular parallelepiped flat plate portion 71a placed on the upper surface of the sensor member 70 and side wall portions 71b and 71c protruding from opposite ends of the flat plate portion 71a and disposed on the front and rear end surfaces of the sensor member 70 in the direction of travel (y direction) of the armature 2A. The length of the flat plate portion 71a between the side wall portions 71b and 71c is approximately equal to the length of the sensor member 70 along the direction of travel (y direction) of the armature 2A. The outer dimensions of the flat surface of the flat plate portion 71a of the pressing member 71 are approximately the same as or slightly larger than the size of the first groove portion 61a. The pressing member 71 is made of silicone rubber, for example, but may be made of other materials.

[0032] The accommodation groove 61 also has a step portion 64 formed by the difference in size between the first groove portion 61a and the second groove portion 61b on the front end surface side of the sensor member 70. With the pressing member 71 fitted onto the upper part of the sensor member 70, the temperature detection member 7A accommodates the sensor member 70 in the accommodation groove 61, and the pressing member 71 is accommodated in the first groove portion 61a. The front end surface of one side wall portion 71b of the pressing member 71 may abut against the upper surface of the step portion 64. The front end surface of the other side wall portion 71c of the pressing member 71 faces the upper surface of the step portion 63 with the opening 62 between them. As a result, the flat portion 71a of the pressing member 71 is disposed on the top surface of the sensor member 70, and the side wall portions 71b and 71c are disposed on the front end surface and rear end surface of the sensor member 70, respectively. The pressing member 71 is temporarily fixed to the sensor member 70 by fitting it into the upper part of the sensor member 70. In this state, the sensor member 70 is housed in the second groove portion 61b, and the pressing member 71 is housed in the first groove portion 61a. Then, by attaching the armature 2A to the plate-shaped portion 300a of the attachment destination 300, the temperature detection member 7A is sandwiched between the plate-shaped portion 300a of the attachment destination 300 and the resin mold 6, and the sensor member 70 and the pressing member 71 are both permanently fixed. In other words, when attaching the armature 2A to the attachment destination 300, it is possible to prevent the sensor member 70 and the pressing member 71 from coming off or becoming misaligned from the accommodating groove 61, thereby enabling the attachment work of the armature 2A to be performed smoothly.

[0033] Note that the armature 2A in the second embodiment is not limited to a configuration in which the upper surface 30a of the core back 30 is attached to the plate-shaped portion 300a of the attachment target 300. The armature 2A in the second embodiment may be configured, for example, as in the armature 2 shown in Fig. 6, in which a fastening rod 33 extending along the traveling direction (y direction) of the armature 2 is provided on the upper surface 30a of the core back 30, and the fastening rod 33 is attached to the plate-shaped portion 300a of the attachment target 300 using a joining member such as a bolt.

[0034] Embodiment 3 Next, an armature 2B according to the third embodiment will be described. Note that 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. 11 is a perspective view schematically showing an armature constituting the linear motor according to the third embodiment.

[0035] As shown in FIG. 11 , the armature 2B is configured by arranging a plurality of armature modules 20 having the same configuration along the direction of travel (y direction) and connecting them to form a single armature. Adjacent armature modules 20 are connected in contact with each other. While adjacent armature modules 20 do not necessarily need to be in contact with each other, it is desirable that they be in contact in order to transfer heat generated in the armature modules 20. The armature module 20 includes an iron core 3, an insulator 4, a coil 5, and a resin mold 6. The iron core 3, the insulator 4, the coil 5, and the resin mold 6 have the same configurations as those of the armature 2 described in the first embodiment.

[0036] Of the multiple connected armature modules 20, a temperature detecting member 7 that detects the temperature of heat generated inside the resin mold 6 is accommodated in the accommodating groove 61 of one armature module 20. The temperature detecting member 7 is accommodated in the accommodating groove 61 so that its upper portion protrudes from the upper surface 60 of the resin mold 6. Lead wires 7a of the temperature detecting member 7 are drawn out from openings 62 of the first groove portions 61a (see FIG. 5, etc.). The temperature detecting member 7 is accommodated in the accommodating groove 61, and when the core back 30 is attached to the plate-shaped portion 300a of the attachment destination 300, the temperature detecting member 7 is sandwiched and fixed between the plate-shaped portion 300a and the resin mold 6.

[0037] The selection of the armature module 20 to house the temperature detection member 7 can be decided by the user, but considering the extraction of the lead wire 7a of the temperature detection member 7, it is desirable to select an armature module 20 that is positioned so that the opening 62 of the first groove portion 61a is on the outer periphery of the armature 2B.

[0038] The temperature detecting member 7 may be the temperature detecting member 7A described in the second embodiment. The temperature detecting member 7 may be housed in the housing grooves 61 of two or more of the multiple armature modules 20. The number of armature modules 20 shown in FIG. 11 is an example and is not limited to the number shown. There may be two or more armature modules 20.

[0039] The armature 2B is configured by connecting multiple armature modules 20 to form a single armature, so multiple small motors can be driven as one large motor. The heat generated in each armature module 20 is transferred to adjacent armature modules 20 and can be detected by the temperature detecting member 7. In other words, the armature 2B does not require a temperature detecting member 7 to be housed in every armature module 20, and the temperatures of all armature modules 20 can be managed with one temperature detecting member 7 housed in one armature module 20.

[0040] As described above, with the armature 2B according to the third embodiment, a large motor can be formed by using only one type of armature module 20 and connecting as many armature modules 20 as the user requires for the required thrust. In this case, since only one type of armature module 20 is required, inventory management of the armature modules 20 is easy for both the manufacturer and the user. Furthermore, the manufacturer can significantly reduce investment in manufacturing equipment and can reduce the types and sizes of manufacturing facilities to be prepared. Furthermore, manufacturing errors in the armature modules 20 are reduced, and the lead time for delivery of the armature modules 20 can be shortened. Furthermore, the number of temperature detection members 7 can be reduced, thereby reducing manufacturing costs. On the other hand, the user can easily select the armature modules 20.

[0041] FIG. 12 is a plan view schematically showing a modified example of the armature constituting the linear motor according to the third embodiment. The armature 2B is not limited to a configuration in which the armature modules 20 are arranged and connected only in the direction of travel of the armature 2B (y direction). For example, as shown in FIG. 12, the armature modules 20 may be arranged and connected in a direction (x direction) perpendicular to the direction of travel of the armature 2B (y direction). Of the multiple connected armature modules 20, a temperature detecting member 7, 7A that detects the temperature of heat generated inside the resin mold 6 is housed in the housing groove 61 of one armature module 20. Note that the temperature detecting member 7, 7A may be housed in the housing groove 61 of two or more armature modules 20 out of the multiple armature modules 20. The number of armature modules 20 shown in FIG. 12 is merely an example and is not limited to the number shown.

[0042] The armature 2B in the third embodiment is not limited to a configuration in which the upper surface 30a of the core back 30 is attached to the plate-shaped portion 300a of the attachment target 300. The armature 2B in the third embodiment may be configured, for example, as in the armature 2 shown in Fig. 6, in which a fastening rod 33 extending along the direction of travel (y direction) of the armature 2 is provided on the upper surface 30a of the core back 30, and the fastening rod 33 is attached to the plate-shaped portion 300a of the attachment target 300 using a joining member such as a bolt.

[0043] 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]

[0044] 1 field magnet, 2, 2A, 2B armature, 3 iron core, 4 insulator, 5 coil, 6 resin mold, 7, 7A temperature detection member, 7a lead wire, 10 mounting seat, 11 permanent magnet, 20 armature module, 30 core back, 30a, 60 upper surface, 31 teeth, 31a tip surface, 32, 34 screw hole, 33 fastening rod, 61 accommodation groove, 61a first groove portion, 61b second groove portion, 62 opening, 63, 64 step portion, 70 sensor member, 71 pressing member, 71a flat plate portion, 71b, 71c side wall portion, 100, 101 linear motion motor, 200 base member, 200a bottom portion, 200b side portion, 200c rail member, 300 mounting destination, 300a Plate-shaped portion, 300b guide portion, 400 conveyed object.

Claims

1. An armature that is disposed opposite to a field magnet via an air gap when attached to a mounting target and is movable relative to the field magnet, an iron core having a core back extending in a traveling direction and a plurality of teeth arranged in parallel along the traveling direction and extending from the core back toward the field magnet; an insulator provided on the iron core; a coil wound around the teeth via the insulator; a resin mold having an upper surface facing the attachment destination and sealing the periphery of the core back and the teeth; a temperature detection member for detecting the temperature of heat generated inside the resin mold, an accommodation groove for accommodating the temperature detection member is formed on an upper surface of the resin mold facing the attachment portion; The temperature detection member is accommodated in the accommodation groove, and is fixed by being sandwiched between the attachment and the resin mold when the armature is attached to the attachment. An armature characterized by:

2. An armature that is disposed opposite to a field magnet via an air gap when attached to a mounting target and is movable relative to the field magnet, The armature is configured by connecting a plurality of armature modules, The armature module includes: an iron core having a core back extending in a traveling direction and a plurality of teeth arranged in parallel along the traveling direction and extending from the core back toward the field magnet; an insulator provided on the iron core; a coil wound around the teeth via the insulator; a resin mold having an upper surface facing the attachment destination and sealing the periphery of the core back and the teeth, The resin mold has an accommodation groove formed on an upper surface facing the attachment destination, a temperature detection member that detects the temperature of heat generated inside the resin mold is accommodated in the accommodation groove of at least one of the armature modules, The temperature detection member is accommodated in the accommodation groove, and is fixed by being sandwiched between the attachment and the resin mold when the armature is attached to the attachment. An armature characterized by:

3. the temperature detecting member is accommodated in the accommodation groove of one of the armature modules, 3. The armature according to claim 2.

4. The depth of the accommodation groove is smaller than the thickness of the core back in the depth direction of the accommodation groove.

4. The armature according to claim 1, wherein the armature is a stator.

5. The temperature detecting member is a sensor member for detecting the temperature of heat generated inside the resin mold; a pressing member having elasticity, which is separate from the sensor member and is disposed between the sensor member and the mounting destination; 4. The armature according to claim 1, wherein the armature is a stator.

6. the pressing member has a concave shape with a flat plate portion disposed on the upper surface of the sensor member and side wall portions protruding from opposite ends of the flat plate portion and disposed on the front and rear end surfaces of the sensor member, and is fitted into and fixed to the accommodating groove; 6. The armature according to claim 5.

7. The pressing member is made of a material having a lower thermal conductivity than the attachment portion.

6. The armature according to claim 5.

8. The field magnet and and the armature according to any one of claims 1 to 3. A linear motor characterized by:

Images