SERVOANTRIEB

Abstract

Servo drive (1) for controlling the operation of a servo motor, comprising: a capacitor (27) forming a smoothing circuit of an inverter and having a substantially cylindrical external shape; a container body (21) in which the capacitor (27) is stored; and a housing (10) that accommodates the capacitor (27) and the container body (21), wherein the housing (10) comprises a lid body (11) which includes a section in which a closure section (14) is provided, and a box body having an opening, closed by the lid body (11), wherein the container body (21) has an essentially box-like shape, which is formed by being provided with an opening section (21a) that makes it possible to insert and remove the capacitor (27) in relation to the container body (21) along a direction orthogonal to an axial direction of the capacitor (27), wherein the container body (21) is mounted on the box body of the housing (10) such that the opening section (21a) is covered by the closing section (14), which is part of the housing (10), and wherein the capacitor (27) is sandwich-like enclosed and held between the closure section (14) and a bottom section (21b) of the container body (21) which is arranged on a side opposite the side with the opening section (21a), wherein the capacitor (27) is elastically prestressed against the bottom section (21b) by a damping material (40) which is elastically deformable and is arranged between the closure section (14) and the capacitor (27).

Description

Technical field

[0001] The present disclosure relates to a servo driver or servo drive for controlling the operation of a servo motor. State of the art

[0002] A servo drive controls the operation of a servo motor in accordance with a command from a host controller and, in particular, controls the servo motor's output torque, rotational speed, position, or similar parameters. The servo drive includes an inverter equipped with a converter circuit, a smoothing circuit, an inverter circuit, a control circuit, a recuperation resistor or regenerative resistor, and the like, to supply the servo motor with an appropriate amount of electrical current at a suitable time, thus providing the servo motor with an alternating current adapted to exhibit any desired frequency.

[0003] Here in the inverter, the capacitor, which forms the smoothing circuit, is a large electrical component compared to others and occupies a significant portion of the space within its housing. Generally, the capacitor has a substantially cylindrical shape and a configuration where a pair of connection terminals are provided on one end face in the axial direction. Therefore, when designing a servo drive, the question of how to reliably hold this capacitor within the housing is a critical one.

[0004] For example, Japanese patent publication no. 2012-39047 (Patent Reference 1: JP 2012-39047A) and Japanese patent publication no. 2013-110317 (Patent Reference 2: JP 2013-110317A) disclose a capacitor device that is modularized in such a way that a storage container, designed in a tubular form, is provided so that a capacitor can be inserted and removed axially, and the capacitor is held by the storage container. Patent Reference 3 discloses an energy storage module that reduces costs and allows for easy attachment of a storage element.

[0005] The capacitor device uses a configuration in which the storage container is made of a metal element, so that the heat generated in the capacitor can be efficiently dissipated to the outside, and a gap is provided between an outer circumferential surface of the capacitor and an inner circumferential surface of the storage container and is filled with a filler having high thermal conductivity.

[0006] If the housing of the capacitor device is attached to the housing with the configuration described in these publications, the capacitor can be held relatively reliably in the housing. Citation list for patent literature Patent Literature 1: Japanese Patent Publication No. 2012-39047, JP 2012 - 39 047 A Patent literature 2: Japanese publication no. 2013-110317, JP 2013 - 110 317 A Patent literature 3: JP 2015 - 88 634 A Summary of the invention: Technical problem

[0007] However, all configurations described in the aforementioned publications assume that a section between the condenser and the storage container is filled with a material of high thermal conductivity. Therefore, these configurations are suitable when the heat generation of the condenser is extremely high. However, in cases where the heat generation of the condenser is not extremely high, or where the heat generation of the condenser is high and the heat generated in the condenser can be adequately dissipated by another alternative means, different from the heat dissipation method disclosed in the aforementioned publications, these configurations are not always suitable.

[0008] This means that in a case where the heat dissipation medium, as disclosed in the above-mentioned publications, is not used, it is possible to facilitate the assembly work by using a simpler configuration in the modularization of the capacitor device by storing the capacitor in the storage container.

[0009] Therefore, the present disclosure was made with regard to the problems described above, and one objective of the present disclosure is to provide a servo drive in which a capacitor forming a smoothing circuit of an inverter can be reliably held in a housing and the capacitor can be easily mounted to the housing. Solution to the problem

[0010] A servo drive according to one aspect of the present disclosure serves to control the operation of a servo motor and comprises a capacitor, a container body, and a housing. The capacitor forms a smoothing circuit of an inverter and has a substantially cylindrical outer shape. The capacitor is housed in the container body, and the capacitor and the container body are housed in the housing. The container body has a substantially box-like shape, formed by providing it with an opening section that allows the capacitor to be inserted into and removed from the container body along a direction orthogonal to an axial direction of the capacitor. The container body is mounted to the housing such that the opening section is covered by a closure section that is part of the housing.In the servo drive according to the above aspect of the present disclosure, the capacitor is sandwiched and held between the closure section and a bottom section of the container body, which is located on a side opposite to a side on which the opening section is provided, while it is elastically prestressed to the bottom section by means of a damping material that is elastically deformable and is intermediately positioned between the closure section and the capacitor.

[0011] With this configuration, when the capacitor is housed within the container body and the capacitor module is modularized, not only can the capacitor be easily fitted into the container body, but the capacitor, housed within the container body, can also be sandwiched and held in place between the bottom section of the container body and the closure section, which is part of the housing. This significantly simplifies assembly. Furthermore, by inserting damping material between the capacitor and the closure section, the capacitor is reliably held in place by the container body and the housing. Therefore, using the above configuration makes it possible to provide a servo drive where the capacitor is reliably held within the housing and can be easily mounted to the housing.

[0012] In the servo drive according to the above aspect of the present disclosure, it is advantageous that the damping material is attached either to the closure section or to the capacitor.

[0013] With such a configuration, the damping material can be positioned much more easily between the closure section and the condenser, and the assembly work can be further simplified.

[0014] In the servo drive according to the above aspect of the present disclosure, the housing can comprise a lid body including a section in which the closing section is provided, and a container body having an opening closed by the lid body. In this case, the container body can have a plurality of projections extending in a direction perpendicular to the direction in which the opening section and the bottom section are oriented relative to each other, and a plurality of holes can be provided in a section of the housing body facing the container body in a direction perpendicular to the direction in which the opening section and the bottom section are oriented relative to each other. Furthermore, in this case, the container body can be fastened to the container body by the plurality of projections that fit into the plurality of holes.

[0015] In this configuration, the capacitor module is attached to the housing body by pre-mounting it, and then the opening section of the housing body is covered with the housing lid. This simple assembly process allows the capacitor to be mounted to the housing, further simplifying the installation process.

[0016] The servo drive according to the above aspect of the present disclosure can include an electricity storage state sensing unit provided with a sensing circuit that detects the electricity storage state of the capacitor by measuring a potential difference between a pair of connection terminals of the capacitor and a light-emitting body, which indicates a sensing result obtained by the sensing circuit by illuminating or remaining off. In this case, the electricity storage state sensing unit can be mounted on the container body, and a display window part, which allows visual detection from the outside as to whether the light-emitting body is illuminated or off, can be provided in the housing.

[0017] With this configuration, the energy storage status monitoring unit can be integrated into the capacitor module. Furthermore, a simple configuration, where the display window is located in part of the housing, allows for visual confirmation from the outside of whether the light-emitting element in the energy storage status monitoring unit is illuminated. This significantly simplifies the configuration for notifying the user of the energy storage status and greatly facilitates the assembly of the servo drive.

[0018] In the servo drive according to the above aspect of the present disclosure, the capacitor and a circuit element to be electrically connected to the capacitor can be connected by a bus rail. In this case, the bus rail can be divided into a capacitor-side bus rail, having one end connected to the capacitor, and a circuit-element-side bus rail, one end of which is connected to the circuit element and the other end of which is connected to the other end of the capacitor-side bus rail.

[0019] In this configuration, part of the bus rail is integrated into the capacitor module. Therefore, when the capacitor module is mounted to the housing, the bus rail of the integrated section is connected to the bus rail of the section connected to the circuit element previously mounted to the housing. This simple process allows the capacitor to be electrically connected to the circuit element. Thus, even in cases where the capacitor is stored and modularized within the housing, the electrical connection can be made reliably and easily.

[0020] In the servo drive according to the above aspect of the present disclosure, the container body can be made of an insulating resin element.

[0021] With this configuration, compared to a housing where the container body is made from a single metal part, it is not only possible to prevent short circuits, but also to significantly reduce the overall weight of the servo drive. Furthermore, because the degree of freedom in designing the shape of the container body is increased, the capacitor can be held more reliably by the container body.

[0022] In the servo drive according to the above aspect of the present disclosure, the damping material can be made from a damping sheet with high thermal conductivity.

[0023] In this configuration, the heat generated in the capacitor is efficiently dissipated to the housing through the damping material, thus achieving a good configuration in terms of the heat dissipation efficiency of the capacitor. Effects of the invention

[0024] According to the present disclosure, it is possible to provide a servo drive in which a capacitor forming a smoothing circuit of an inverter can be reliably held in a housing and the capacitor can be easily mounted to the housing. Brief description of the drawings Fig. Figure 1 is a perspective view of a servo drive according to one embodiment. Fig. 2 is a perspective view of the in Fig. 1 servo drive shown from a different direction. Fig. 3 is a perspective view of the in Fig. Figure 1 shows a servo drive, in which the illustration of part of the housing and part of the internal components is omitted. Fig. 4 is a perspective view of the in Fig. Figure 1 shows a servo drive, in which the representation of part of a housing and part of the internal components is omitted. Fig. 5 is a perspective view of a Fig. 3 and Fig. 4 capacitor modules shown. Fig. 6 is a perspective view of the in Fig. 5 capacitor module shown from a different direction. Fig. Figure 7 is a perspective exploded view showing an assembly structure of the in Fig. The capacitor module shown in section 5 is shown. Fig. Figure 8 is a partially broken perspective view showing a configuration near an electricity storage state monitoring unit in the area shown in Fig. Figure 1 shows the servo drive depicted. Fig. Figure 9 is a perspective view showing a method for mounting the capacitor module to the housing of the in Fig. The servo drive shown in Figure 1 is shown. Fig. Figure 10 is a partially broken perspective view showing an enlarged main part of the scene. Fig. The servo drive shown in section 9 is used during assembly work. Fig. Figure 11 is a perspective view showing a method for assembling the capacitor module with the housing of the in Fig. The servo drive shown in Figure 1 is shown. Fig. Figure 12 is a partially broken perspective view showing an enlarged main part of the scene. Fig. Figure 11 shows the servo drive during assembly. Description of the embodiments.

[0025] One embodiment is described in detail below with reference to the drawings. In the embodiment shown below, identical or common parts in the drawings are designated with the same reference numerals, and the description is not repeated. <A. Schematischer Aufbau des Servoantriebs>

[0026] Fig. Figure 1 is a perspective view of a servo drive according to one embodiment, seen from an oblique angle from above right in front, and Fig. Figure 2 is a perspective view of the servo drive, seen from a low angle at the bottom left from behind. Fig. 3 and Fig. 4 are perspective views of the in Fig. Figure 1 shows a servo drive, in which the illustration of part of a housing and part of the internal components has been omitted. First, a schematic diagram of the servo drive 1 according to the present embodiment is shown with reference to the Fig. 1, Fig. 2, Fig. 3 to Fig. 4 described.

[0027] The internal components that are in the Fig. 3 and Fig. The components not shown in Figure 4 are mainly electrical parts and the like, with the exception of a capacitor module 20 and a mainboard 30, which will be described later. Part of the housing, which is located in Fig. 3 is not shown, it is a front wall 10a, part of a right side wall 10d and a lower wall 10f (see Fig. 1 and Fig. 2), which will be described later, and part of the housing 10, which is in Fig. 4 is not shown, the front wall is 10a, part of a left side wall is 10c, part of the right side wall is 10d and the lower wall is 10f (see Fig. 1 and Fig. 2), which will be described later.

[0028] As in the Fig. 1, Fig. 2, Fig. 3 to Fig. As shown in Figure 4, the servo drive 1 is an electrical device with a substantially rectangular, parallelepiped outer shape and is composed of a housing 10 and various internal components located inside the housing 10. The servo drive 1 controls the operation of a servo motor (not shown) in accordance with a command from a host controller (not shown) and, in particular, controls an output torque, rotational speed, position, or similar parameter of the servo motor.

[0029] The servo drive 1 contains an inverter equipped with a converter circuit, a smoothing circuit, an inverter circuit, a control circuit, a regenerative resistor, and the like. The various internal components housed in the enclosure 10 described above include the converter circuit, the smoothing circuit, the inverter circuit, the control circuit, the regenerative resistors, and the like, which together form the inverter. The smoothing circuit consists of two capacitors 27, which will be described later.

[0030] As in the Fig. 1 and Fig. As shown in Figure 2, the housing 10 has a front wall 10a and a rear wall 10b located at the front and rear, a left side wall 10c and a right side wall 10d located at the left and right sides, and a top wall 10e and a bottom wall 10f located at the top and bottom. The servo drive 1 is to be installed on a wall surface of a control panel or the like in a wall-mounted configuration, and therefore the rear wall 10b of the housing 10 is provided with a mounting hole or the like for attaching the servo drive 1 to the wall surface.

[0031] In the following description, the directions in which the front wall 10a and the rear wall 10b are located, as seen from a central section of the servo drive 1, are referred to as the X1 direction and the X2 direction, and a front-to-back direction corresponding to the X1 and X2 directions is also referred to as the X-axis direction. Furthermore, the directions in which the left side wall 10c and the right side wall 10d are located, as seen from a central section of the servo drive 1, are referred to as the Y1 direction and the Y2 direction, and a left-to-right direction corresponding to the Y1 and Y2 directions is also referred to as the Y-axis direction.Furthermore, the directions in which the upper wall 10e and the lower wall 10f are located as seen from a central section of the servo drive 1 are called the Z1 direction and Z2 direction, and a vertical direction which is a direction corresponding to the Z1 direction and the Z2 direction is also called the Z-axis direction.

[0032] The housing 10 is composed of a lid body with the front wall 10a described above and a box body with the rear wall 10b, left side wall 10c, right side wall 10d, upper wall 10e and lower wall 10f described above. The housing 10 has a substantially rectangular, parallelepiped outer shape by virtue of the lid body being attached to the box body to close an opening provided in the box body described above.

[0033] The front wall 10a, the upper wall 10e, and the lower wall 10f are provided with various connection ports for connecting to the host controller, servo motor, or similar device, as described above. Furthermore, the left side wall 10c, the right side wall 10d, the upper wall 10e, and the lower wall 10f of the enclosure 10 are provided with a large number of ventilation holes, and a space inside the enclosure 10 and a space outside the enclosure 10 are connected to each other through these ventilation holes.

[0034] The housing 10 is formed by the combination of a multitude of elements. Among these, the front wall 10a, which is the lid body described above, is formed from an essentially flat, plate-shaped front housing 11; part of the left side wall 10c, which is part of the box body described above, is formed from an essentially flat, plate-shaped left side housing 12; and part of the right side wall 10d and part of the top wall 10e, each of which is part of the box body described above, are formed from a curved, plate-shaped right side housing 13 (see Fig. 1, Fig. 2, Fig. 3 to Fig. 4, Fig. 9 and Fig. 11 and the like).

[0035] As in Fig. As shown in Figure 1, part of the front wall 10a of the housing 10 forms a closure section 14, which forms an opening section 21a (see Figure 1). Fig. 3 and Fig. 4) covers a container body 21, which will be described later, and a capacitor module 20 (see Fig. 3 and Fig. 4), which contains the container body 21, is located behind the closure section 14.

[0036] Furthermore, a display window part 15 for indicating the electricity storage state of the two capacitors 27 described above is provided at a predetermined position on the front wall 10a of the housing 10. Behind the display window part 15 is a light-emitting body 29b (see Fig. 3 and Fig. 4) provided, which consists, for example, of a light-emitting diode (LED) or similar. It is configured so that when the light-emitting body 29b is illuminated, the light emitted by the light-emitting body 29b is projected outwards through the display window part 15, and a user can visually determine whether the light-emitting body 29b is illuminated or not. Details of the light-emitting body 29b and an electricity storage state sensing unit 29 provided with the light-emitting body 29b (see Fig. 3 and Fig. 4) will be described later.

[0037] As in the Fig. 3 and Fig. As shown in Figure 4, a space is provided inside the housing 10 in which the various internal components described above are located. The capacitor module 20, which contains the two capacitors 27 and the container body 21, is arranged in this space, and the capacitor module 20 is located behind the closure section 14, which is provided in the front wall 10a of the housing 10, as described above. More precisely, the capacitor module 20 is arranged in a front upper section of the space inside the housing 10, bordering the front wall 10a, the left side wall 10c, the right side wall 10d, and the upper wall 10e of the housing 10.

[0038] As in the Fig. 1, Fig. 2, Fig. 3 to Fig. As shown in Figure 4, the capacitor module 20 is mounted to the housing 10 by a first projection 23 and a second projection 25, which will be described later, provided at predetermined positions on the container body 21 and inserted into a first hole 16 and a second hole 18 (see Figure 4). Fig. 9, Fig. 10, Fig. 11 to Fig. 12) fit, which will be described later and are provided in the left side wall 10c and the right side wall 10d of the housing 10, respectively. This accommodates the two capacitors 27 and the container body 21, which form the capacitor module 20, within the space inside the housing 10. The detailed configuration of this point will be described later.

[0039] As in the Fig. 3 and Fig. As shown in Figure 4, the mainboard 30 is located in the space within the housing 10 and behind a section in which the capacitor module 20 is located, such that the mainboard 30 extends along a YZ plane. The mainboard 30 is a relay board for connecting the various circuits and the like mentioned above that form the inverter.

[0040] Here, the two capacitors 27 mentioned above, which form the smoothing circuit of the inverter, are connected to the main board 30 via a bus rail and are each electrically connected to the inverter circuit and the converter circuit, which together form the inverter, via the main board 30 for further distribution. The inverter circuit consists of a power module with packaging components such as an intelligent power module (IPM), and the converter circuit consists of a diode module with packaging components.

[0041] In the present embodiment, the aforementioned bus rail is divided into capacitor-side bus rails 28A and 28B, which are integrated into the capacitor module 20, and mainboard-side bus rails 31A and 31B, which are mounted on the mainboard side 30. When the capacitor-side bus rails 28A and 28B and the mainboard-side bus rails 31A and 31B are connected to each other, a smoothing circuit consisting of the two capacitors 27 is electrically connected to the inverter circuit and the converter circuit.

[0042] The inverter circuit and converter circuit mentioned above correspond to the circuit element components to be electrically connected to the two capacitors 27, and the mainboard-side bus rails 31A and 31B mentioned above correspond to the circuit element component-side bus rails. <B. Konfiguration des Kondensatormoduls und Konfiguration in der Nähe davon>

[0043] Fig. 5 and Fig. Figure 6 shows perspective views of the aforementioned capacitor module from a low angle on the front and from a low angle on the back. Furthermore, Fig. 7 a perspective exploded view showing an assembly structure of the capacitor module, and Fig. Figure 8 is a partially broken perspective view showing a configuration near the electricity storage state sensing unit in the servo drive 1 according to the present embodiment. The following refers to the above-described Fig. 3 and Fig. 4 and the Fig. 5, Fig. 6, Fig. 7 to Fig. 8 a configuration of the capacitor module 20 in the servo drive 1 according to the present embodiment and a configuration close to it are described in detail.

[0044] As in the Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. As shown in Figure 7, the capacitor module 20 consists mainly of the container body 21, the two capacitors 27, each having a substantially cylindrical outer shape, and the capacitor-side bus rails 28A and 28B. The capacitor module 20 is configured such that the container body 21 serves as a base, the two capacitors 27 are mounted in the container body 21, and a pair of capacitor-side bus rails 28A and 28B are attached to the two capacitors 27 housed in the container body 21. Furthermore, in the present embodiment, the electricity storage state detection unit 29 is mounted at a predetermined position on the capacitor module 20.

[0045] The container body 21 has a box-like shape with an opening section 21a provided in a surface and is made of an insulating resin element. More precisely, the container body 21 has a bottom section 21b and a left frame section 21c, a right frame section 21d, an upper frame section 21e, and a lower frame section 21f extending from a circumferential edge of the bottom section 21b. By providing the bottom section 21b, the left frame section 21c, the right frame section 21d, the upper frame section 21e, and the lower frame section 21f in the container body 21, a storage section 22 (see in particular) is formed. Fig. 5 and Fig. 7) provided within the container body 21. Here, the opening section 21a mentioned above is defined by end sections of the left frame section 21c, the right frame section 21d, the upper frame section 21e and the lower frame section 21f of a section located on a side opposite the bottom section 21b.

[0046] As in the Fig. 3 and Fig. As shown in Figure 4, the opening section 21a of the container body 21 is arranged so that it faces the front wall 10a in order to be covered by the closure section 14, which is provided in the front wall 10a of the housing 10 as described above (see Figure 4). Fig. 1, Fig. 11 and the like), and the upper frame section 21e of the container body 21 is arranged to face the upper wall 10e of the housing 10. On the other hand, the left frame section 21c of the container body 21 is arranged to face the left side wall 10c of the housing 10, and the right frame section 21d of the container body 21 is arranged to face the right side wall 10d of the housing 10.

[0047] As in the Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. As shown in Figure 7, the container body 21 is provided with a subdivision section 21g to bridge the left frame section 21c and the right frame section 21d. The subdivision section 21g, provided in the container body 21, divides the storage section 22 inside the container body 21 into two compartments: one compartment located on one side of the upper frame section 21e and one compartment located on one side of the lower frame section 21f. The two capacitors 27 mentioned above are stored in conjunction with each other in the compartments divided by the subdivision section 21g.

[0048] Here, each of the two capacitors 27 is stored in the storage section 22 via the opening section 21a provided in the container body 21 described above. More precisely, the opening section 21a is designed to extend along the YZ plane, so that the capacitor 27 can be inserted into and removed from the storage section 22 of the container body 21 in one direction (i.e., the X-axis direction) orthogonal to an axial direction (i.e., the Y-axis direction) of the capacitor 27.

[0049] With this configuration, the capacitor 27 can be easily inserted into the container body 21. Therefore, the assembly work is considerably simplified compared to a case in which the capacitor 27 is configured to be inserted into the container body 21 in the axial direction of the capacitor 27.

[0050] As in the Fig. 5 and Fig. As shown in Figure 6, the right frame section 21d of the container body 21 is provided with a plurality of first projections 23 and a plurality of locking projections 24, and the left frame section 21c of the container body 21 is provided with a plurality of second projections 25. The plurality of first projections 23, the plurality of locking projections 24, and the plurality of second projections 25 are sections for mounting the container body 21 to the housing 10.

[0051] The plurality of first projections 23 is arranged such that it projects outwards (i.e., in the Y2 direction) from an outer surface of the right frame section 21d (i.e., a surface facing the right side wall 10d of the housing 10) and each has a rectangular shape in plan view. One direction in which the plurality of first projections 23 project corresponds to a direction orthogonal to a direction in which the opening section 21a and the bottom section 21b of the container body 21 are oriented relative to each other.

[0052] In the present embodiment, the container body 21 has a total of three first projections 23, including two first projections 23 located at positions on a front end (i.e., a side in the X1 direction) of the right frame section 21d, and one first projection 23 located at a rear end (i.e., a side in the X2 direction) of the right frame section 21d. Below these, recesses 23a are provided adjacent to the two first projections 23 located near each of the two first projections 23 located at the front end of the right frame section 21d. Each of the recesses 23a has a shape that extends inward (i.e., in the Y1 direction) from the outer surface of the right frame section 21d.

[0053] The plurality of locking projections 24 are arranged to project outwards (i.e., in the X1 direction) from a front end face of the right frame section 21d (i.e., a surface facing the front wall 10a of the housing 10) and each has a hook-shaped locking claw 24a at a pointed end portion thereof. In the present embodiment, two locking projections 24 are provided in the container body 21.

[0054] On the other hand, the plurality of second projections 25 are arranged to project outwards (i.e., in the Y1 direction) from an outer surface of the left frame section 21c (i.e., a surface facing the left side wall 10c of the housing 10) and each have a rectangular shape in plan view. One direction in which the plurality of second projections 25 project is orthogonal to the direction in which the opening section 21a and the bottom section 21b of the container body 21 are oriented relative to each other. In the present embodiment, two second projections 25 are provided at positions on a front end face (i.e., a side in the X1 direction) of the left frame section 21c.

[0055] As in the Fig. 5, Fig. 7 and Fig. As shown in Figure 8, two through-holes, which are essentially T-shaped in plan view, are provided at predetermined positions in the left frame section 21c of the container body 21. A pair of connecting terminals 27a, provided in each of the two capacitors 27 mounted in the bearing section 22, are inserted into each of the two through-holes.

[0056] The capacitor-side bus rails 28A and 28B are connected to each other at the pair of connecting terminals 27a on an outside of the container body 21, and thus electrical current is routed from the two capacitors 27 to the outside of the container body 21 via the capacitor-side bus rails 28A and 28B. Bolts 50 are used to fasten the pair of connecting terminals 27a of each of the two capacitors 27 and the capacitor-side bus rails 28A and 28B to each other.

[0057] As described above, one end of each of the capacitor-side bus rails 28A and 28B is connected to each of the two connection terminals 27a of each of the two capacitors 27, and the other end of each of the capacitor-side bus rails 28A and 28B is brought out from a position on the left frame section 21c of the container body 21 towards an outside on one side of the lower frame section 21f of the container body 21. As shown in the Fig. 4 and Fig. As shown in Figure 8, the other ends of the capacitor-side bus rails 28A and 28B, which are the brought-out sections, are connected to the mainboard-side bus rails 31A and 31B using bolts 51.

[0058] As in the Fig. As shown in Figures 3 to 5, 7 and 8, a retaining section 26 is provided for holding the electricity storage state-sensing unit 29 in a predetermined position on an outer surface of the lower frame section 21f of the container body 21. The retaining section 26 has a hook-shaped locking section and holds the electricity storage state-sensing unit 29 by locking the electricity storage state-sensing unit 29 using the locking section.

[0059] The electricity storage state detection unit 29 comprises a sub-board 29a, a light-emitting body 29b mounted on the sub-board 29a, and a pair of connecting wires 29c extending from the sub-board 29a. The sub-board 29a is equipped with a detection circuit that detects the electricity storage state of the two capacitors 27 by measuring a potential difference between each pair of connecting terminals 27a of the two capacitors 27.

[0060] One end of each pair of leads 29c is connected to the aforementioned sensing circuit, and one end of each of these leads is connected to each of the aforementioned capacitor-side bus rails 28A and 28B by screws 60. The light-emitting body 29b indicates a sensing result of the aforementioned sensing circuit by illuminating or remaining silent. The light-emitting body 29b illuminates when the two capacitors 27 are in a fully charged state and does not illuminate when the two capacitors 27 are in a sufficiently discharged state.

[0061] As above in Fig. As described in Figure 8, the servo drive 1 is configured according to the present embodiment such that the display window part 15 is provided at a predetermined position on the front wall 10a of the housing 10, and the light-emitting body 29b mentioned above is arranged behind the display window part 15. That is, the retaining section 26, which is provided in the lower frame section 21f of the container body 21 described above for holding the electricity storage state sensing unit 29, is arranged to be located behind the display window part 15.

[0062] Therefore, in such a configuration, the electricity storage status sensing unit 29 can be integrated into the capacitor module 20. Furthermore, in a simple configuration where the display window part 15 is provided in a part of the housing 10, it is possible to visually determine from the outside whether the light-emitting body 29b provided in the electricity storage status sensing unit 29 is illuminated or not. This greatly simplifies the configuration for notifying the user about the electricity storage status, and in this respect, the assembly of the servo drive 1 is significantly facilitated.

[0063] As in the Fig. As shown in Figures 3 to 5 and 7, a damping material 40 is attached to a circumferential surface of each of the two capacitors 27, which have a substantially cylindrical outer shape. More precisely, the damping material 40 is attached to a section of the circumferential surface of the capacitor 27 that faces the opening section 21a (i.e., a section located on one side of the closure section 14 provided in the front wall 10a of the housing 10). The damping material 40 consists of an elastically deformable element comprising an adhesive or a pressure-sensitive adhesive applied to a surface (i.e., a major surface on one side of the capacitor 27).

[0064] In this case, by appropriately adjusting the thickness of the damping material 40, a main surface of the damping material 40, located on a side facing the main surface of a side of the capacitor 27, is covered by the sealing section 14 provided in the front wall 10a of the housing 10 and comes into pressure contact with the sealing section 14. That is, the damping material 40 is in a compressed state by being positioned between the sealing section 14 and the capacitor 27.

[0065] As a result, the elastically deformable damping material 40 is intermediately positioned between the closure section 14 and the capacitor 27. The capacitor 27 is then brought into a state in which it is elastically pre-stressed against the bottom section 21b of the container body 21, and in this state, the capacitor 27 is sandwiched and held between the closure section 14 and the bottom section 21b. Therefore, by using this configuration, it is possible to reliably hold the pair of capacitors 27 mounted in the container body 21.

[0066] A damping sheet with high thermal conductivity is preferably used as the damping material 40. Consequently, the heat generated in the capacitor 27 can be efficiently transferred to the housing 10, and a temperature rise of the capacitor 27 can be suppressed. <C. Montagestruktur und Montageverfahren des Kondensatormoduls an dem Gehäuse>

[0067] Fig. 9 and Fig. Figure 11 shows perspective views illustrating a method for mounting the capacitor module with the housing in the servo drive according to the present embodiment. Fig. 10 and Fig. 12 are partially broken perspective views showing an enlarged main part of the servo drive during the in Fig. 9 and Fig. The assembly work shown in section 11 is shown. The following sections refer to the assembly work shown in section 11. Fig. 9, Fig. 10, Fig. 11 to Fig. 12 a mounting structure and a mounting method of the capacitor module 20 on the housing 10 in the servo drive 1 according to the present embodiment is described in detail.

[0068] Furthermore, in the Fig. 9, Fig. 10, Fig. 11 to Fig. Figure 12 shows only one section of the servo drive 1, which is related to the mounting of the capacitor module 20 on the housing 10, and the illustration of the other sections is omitted for better understanding.

[0069] Before explaining the mounting structure and the mounting process of the capacitor module 20 on the housing 10, the configuration of a section of the housing 10 on which the capacitor module 20 is mounted will first be described (i.e. the left side wall 10c and the right side wall 10d, each of which is part of the container body described above).

[0070] As in the Fig. 9, Fig. 10, Fig. 11 to Fig. As shown in Figure 12, the right side wall 10d of the housing 10 is provided with a plurality of first holes 16 and a plurality of locking holes 17, and the left side wall 10c of the housing 10 is provided with a plurality of second holes 18. Among these, the plurality of locking holes 17 is provided in a curved section 13a formed by bending a portion of a front end side section of the right side wall 10d. The plurality of first holes 16, the plurality of locking holes 17, and the plurality of second holes 18 are sections for mounting the container body 21 to the housing 10.

[0071] The plurality of first holes 16 are configured to penetrate the right side wall 10d in the direction of the Y-axis, and each has a rectangular shape in plan view. In the present embodiment, a total of three first holes 16 are provided in the housing 10, including two first holes 16 located at positions on a front end (i.e., a side in the X1 direction) of the right side wall 10d, and one first hole 16 located at a rear end (i.e., a side in the X2 direction) of the right side wall 10d with respect to the two first holes 16. The plurality of first holes 16 corresponds to the plurality of first projections 23 provided in the container body 21 described above.

[0072] This includes a first support projection 16a (see Fig. 10), which has a cut-out and raised shape, near each of the first two holes 16 provided on the front end of the right side wall 10d. The first support projection 16a has a shape that projects inward (i.e., in the Y1 direction) from the right side wall 10d out of the housing 10. The first support projection 16a is provided in the container body 21 corresponding to the recess 23a described above.

[0073] The plurality of locking holes 17 are configured to penetrate the aforementioned curved section 13a of the right side wall 10d in the direction of the X-axis and each has an elongated rectangular shape in plan view. In the present embodiment, two locking holes 17 are provided in the housing 10. The plurality of locking holes 17 corresponds to the plurality of locking projections 24 provided in the container body 21 described above.

[0074] On the other hand, the plurality of second holes 18 are configured such that they penetrate the left side wall 10c in the direction of the Y-axis and each has a rectangular shape in plan view. In the present embodiment, two second holes 18 are provided at positions on a front end (i.e., a side in the X1 direction) of the left frame section 21c. The plurality of second holes 18 corresponds to the plurality of second projections 25 provided in the container body 21 described above.

[0075] A second supporting projection 18a (see Fig. 12) A cut-out and raised form is provided near each of the two second holes 18. The second support projection 18a has a shape that extends inward (i.e., in the Y2 direction) from the left side wall 10c out of the housing 10. The second support projection 18a corresponds to the second projection 25 provided in the container body 21 described above.

[0076] As described above, the capacitor module 20 is mounted to the housing 10 by fitting the first projection 23 and the second projection 25, which are provided at predetermined positions of the container body 21, into the first hole 16 and the second hole 18, which are provided in the left side wall 10c and the right side wall 10d of the housing 10, respectively.

[0077] The capacitor module 20 is mounted on the housing 10 as shown in the Fig. 9, Fig. 10, Fig. 11 to Fig. 12 shown in a position in which the front wall 10a of the housing 10 is vertically upwards and the rear wall 10b of the housing 10 is vertically downwards.

[0078] Specifically, it will first be explained how in Fig. Figure 9 shows the capacitor module 20, in which the two capacitors 27 are pre-stored in the container body 21 and the capacitor-side bus rails 28A and 28B and the electricity storage state detection unit 29 are mounted together, in the direction of the right side wall 10d (i.e. the right side housing 13) of the housing 10 from an arrow direction shown in the drawing (i.e. the Y2 direction).

[0079] At this point, as in Fig. Figure 10 shows the plurality of first projections 23 provided in the right frame section 21d of the container body 21 being fitted into the plurality of first holes 16 provided in conjunction with each other in the right side wall 10d of the housing 10, and the locking claws 24a of the plurality of locking projections 24 provided in the right frame section 21d of the container body 21 being locked with the plurality of locking holes 17 provided in the curved part 13a of the right side wall 10d of the housing 10 by being fitted into conjunction with each other. At this point, the plurality of first support projections 16a, which are provided in the right side wall 10d of the housing 10, are inserted into the plurality of recesses 23a, which are provided in the right frame section 21d of the container body 21, in conjunction with each other.

[0080] As a result, the plurality of first projections 23 and the plurality of first holes 16 are fitted together, and the plurality of first support projections 16a and the plurality of recesses 23a are fitted together, and thus the capacitor module 20 is supported by the right side wall 10d. In addition, the plurality of locking claws 24a are locked with the plurality of locking holes 17 to prevent the capacitor module 20 from falling off the right side wall 10d.

[0081] Next, as in Fig. 11 shows the left side wall 10c (i.e. the left side housing 12) of the housing 10 mounted in the direction of the right side housing 13 including the capacitor module 20, which is supported by the right side wall 10d of the housing 10 and the right side wall 10d from an arrow direction shown in the drawing (i.e. the Y2 direction).

[0082] At this point, as in Fig. Figure 12 shows the plurality of second projections 25, provided in the left frame section 21c of the container body 21, being inserted into the plurality of second holes 18, provided in the left side wall 10c of the housing 10, in conjunction with one another. At this point, the plurality of second support projections 18a, provided on the left side wall 10c of the housing 10, come into contact with the rear faces of the plurality of second projections 25, provided in the left frame section 21c of the container body 21.

[0083] Then the left side housing 12 is attached to the right side housing 13 with the right side wall 10d of the housing 10 using screws (not shown), thus sandwiching and holding the capacitor module 20 between the right side wall 10d and the left side wall 10c.

[0084] Next, as in Fig. As shown in Figure 11, the front wall 10a (i.e., the front side case 11) of the case 10 is mounted in the direction of the right side case 13 and the left side case 12 of the case 10 to cover the opening section 21a of the container body 21 of the capacitor module 20, which is held by the right side wall 10d and the left side wall 10c of the case 10 from an arrow direction shown in the drawing (i.e., the X2 direction).

[0085] In particular, the front side housing 11 is attached to the front wall 10a of the housing 10, to the right side housing 13 to the right side wall 10d of the housing 10, and to the left side housing 12 to the left side wall 10c of the housing 10 by screws (not shown). This covers the opening section 21a of the container body 21 with the closure section 14, which is provided on the front wall 10a of the housing 10, and the closure section 14 comes into contact with the damping materials 40, which were previously attached to the two capacitors 27 stored in the container body 21.

[0086] Therefore, the damping material 40 is positioned and compressed between the capacitor 27 and the closure section 14. The capacitor 27 is thereby sandwiched and held between the closure section 14 and the bottom section 21b, while being elastically prestressed against the bottom section 21b of the container body 21. <D. Schlussfolgerung>

[0087] As described above, in the servo drive 1 according to the present embodiment, when the capacitor 27 is housed in the container body 21 and modularized as a capacitor module 20, not only can the capacitor 27 be easily fitted into the container body 21, but the capacitor 27, stored in the container body 21, can also be sandwiched and held in place between the bottom section 21b of the container body 21 and the closure section 14, which is part of the housing 10. This significantly simplifies assembly. Furthermore, by placing the damping material 40 between the capacitor 27 and the closure section 14, it is possible to reliably hold the capacitor 27 in place between the container body 21 and the housing 10.

[0088] The above configuration therefore makes it possible to provide a servo drive 1 in which the capacitor 27 can be reliably held in the housing 10 and the capacitor 27 can be easily mounted on the housing 10.

[0089] Since the servo drive 1 according to the present embodiment has a configuration in which the damping material 40 is attached to the capacitor 27 in advance, it is possible to insert the damping material 40 much more easily between the closure section 14 and the capacitor 27, and the assembly work can also be made easier in this respect.

[0090] Furthermore, according to the present embodiment, the servo drive 1 is configured such that the housing 10 is divided into the cover body (i.e., the front housing 11), which is a section in which the closure section 14 is provided, and the container body (i.e., the other housing besides the front housing 11), which is provided with the opening closed by the cover body. The cover body is then attached to the container body after the capacitor module 20 has been attached to the container body by means of a snap-on fitting. Thus, the closure section 14 covers the opening section 21a of the container body 21. Therefore, it is possible to mount the capacitor to the housing with significantly simpler assembly effort. In this respect as well, the assembly work can be simplified.

[0091] Furthermore, according to the present embodiment, the servo drive 1 is configured such that the bus rail connected to the capacitor 27 is split, and thus the capacitor-side bus rails 28A and 28B are integrated into the capacitor module 20. When the capacitor module 20 is mounted to the housing 10, the capacitor-side bus rails 28A and 28B are connected to the mainboard-side bus rails 31A and 31B, which are the remaining bus rails previously mounted together on the housing 10. In this simple way, it is possible to electrically connect the capacitor 27 to other circuit components. Therefore, with such a configuration, even in a case where the capacitor 27 is housed in the container body 21 and modularized, the electrical connection can be carried out reliably and easily.

[0092] Furthermore, the housing 21 of the servo drive 1, according to the present embodiment, is made of an insulating resin element. Therefore, compared to a case where the housing 21 is made of a metal element, it is not only possible to prevent the occurrence of a short circuit, but also to significantly reduce the weight of the servo drive 1 as a whole. Since the degree of freedom in shaping the housing 21 is increased, the capacitor 27 can also be held more reliably by the housing 21.

[0093] Since the damping material 40 of the servo drive 1 is made from a damping sheet with high thermal conductivity according to the present embodiment, the heat generated in the capacitor 27 is efficiently dissipated to the housing 10 by the damping material 40, thereby achieving a good configuration with regard to the heat dissipation efficiency of the capacitor 27. <E. Anhang>

[0094] The characteristic configuration of the servo drive 1 according to the embodiment described above is summarized as follows. [Configuration 1]

[0095] A servo drive for controlling the operation of a servo motor, which includes: a capacitor (27) which forms a smoothing circuit of an inverter and has a substantially cylindrical outer shape; a container body (21) in which the capacitor is stored; and a housing (10) that accommodates the capacitor and the container body, wherein the container body has an essentially box-like shape formed by providing it with an opening section (21a) which makes it possible to insert and remove the capacitor in relation to the container body along a direction orthogonal to an axial direction of the capacitor, wherein the container body is mounted to the housing such that the opening section is covered by a closing section (14) which is part of the housing, and wherein the condenser is enclosed and held between the closure section and a bottom section (21b) of the container body, which is located on a side opposite a side on which the opening section is provided, while being elastically prestressed to the bottom section by a damping material (40) which is elastically deformable and is arranged between the closure section and the condenser. [Configuration 2]

[0096] The servo drive according to configuration 1, wherein the damping material is attached either to the closure section or to the capacitor. [Configuration 3]

[0097] The servo drive according to configuration 1 or 2, wherein the housing comprises a lid body (11) with a section in which the closure section is provided and a box body with an opening closed by the lid body, wherein the container body has a plurality of projections (23, 25) which project in a direction orthogonal to a direction in which the opening section and the bottom section are aligned with each other, wherein a plurality of holes (16, 18) is provided in a section of the container body which is orthogonal to the container body in the direction in which the opening section and the bottom section are aligned to each other, and wherein the container body is attached to the box body by the plurality of projections which are fitted into the plurality of holes. [Configuration 4]

[0098] The servo drive according to one of configurations 1 to 3, comprising: an electricity storage state detection unit (29) provided with a detection circuit that detects an electricity storage state of the capacitor by measuring a potential difference between a pair of connection terminals (27a) of the capacitor and a light-emitting body (29b) that indicates a detection result obtained from the detection circuit by lighting up or not lighting up, wherein the electricity storage state detection unit is mounted on the container body and a display window part (15) which allows visual detection from the outside as to whether the light-emitting body is illuminated or not is provided in the housing. [Configuration 5]

[0099] The servo drive according to one of the configurations 1 to 4, wherein the capacitor and a circuit element that is to be electrically connected to the capacitor are connected by a bus rail, and wherein the bus rail is divided into a capacitor-side bus rail (28A, 28b), one end of which is connected to the capacitor, and a circuit-element component-side bus rail (31A, 31B), having one end connected to the circuit element component and having another end connected to the other end of the capacitor-side bus rail. [Configuration 6]

[0100] The servo drive according to one of configurations 1 to 5, wherein the container body consists of an insulating resin element. [Configuration 7]

[0101] The servo drive according to one of the configurations 1 to 6, wherein the damping material is made from a damping sheet, having a high thermal conductivity. <F. Andere Formen und dergleichen>

[0102] In the embodiment described above, the case in which the damping material is attached to the capacitor has been described as an example, but the damping material can be attached to the closure section of the housing, or the damping material can simply be arranged between the capacitor and the closure section in a state in which the closure section is not attached to the capacitor.

[0103] Furthermore, the configuration of the housing, the configuration of the container body, the configuration of the bus rail and the like, shown in the embodiment described above, can be changed as required and are not limited to the configurations shown in the embodiment described above.

[0104] Furthermore, in the embodiment described above, the case in which a plurality of projections are provided in the container body and a plurality of holes into which these projections can be fitted are provided in the box body of the housing, and thus the capacitor module is attached to the housing, has been described as an example, but the capacitor module can be mounted on the housing by using a different mounting structure.

[0105] As described above, the embodiment disclosed here is an example in every respect and is not limiting. The technical scope of the present invention is defined by the scope of the claims and includes all modifications within the meaning and scope of the description of the claims and the equivalent. Reference symbol list

[0106] 1 Servo drive; 10: Housing; 10a: Front wall; 10b: Rear wall; 10c: Left side wall; 10d: Right side wall; 10e: Top wall; 10f: Bottom wall; 11: Front side housing; 12: Left side housing; 13: Right side housing; 13a: Curved section; 14: Closure section; 15: Display window section; 16: First hole; 16a: First support projection; 17: Locking hole; 18: Second hole; 18a: Second support projection; 20: Capacitor module; 21: Container body; 21a: Opening section; 21b: Bottom section; 21c: Left frame section; 21d: Right frame section; 21e: Top frame section; 21f: Bottom frame section; 21g: Subdivision section; 22: Bearing section; 23: First projection; 23a: Recess; 24: Locking projection; 24a: Locking claw; 25: Second projection; 26: Retaining section; 27: Capacitor; 27a: Connection terminal; 28A, 28B: Capacitor-side bus rail; 29: Energy storage state sensing unit; 29a: Sub-board; 29b: Light-emitting body;29c: Conductor wire; 30: Mainboard; 31A, 31B: Mainboard-side bus rail; 40: Damping material; 50, 51: Bolt; 60: Screw.

Claims

[1] Servo drive (1) for controlling the operation of a servo motor, comprising: a capacitor (27) forming a smoothing circuit of an inverter and having a substantially cylindrical external shape; a container body (21) in which the capacitor (27) is stored; and a housing (10) that accommodates the capacitor (27) and the container body (21), wherein the housing (10) comprises a lid body (11) which includes a section in which a closure section (14) is provided, and a box body having an opening, closed by the lid body (11), wherein the container body (21) has an essentially box-like shape, which is formed by being provided with an opening section (21a) that makes it possible to insert and remove the capacitor (27) in relation to the container body (21) along a direction orthogonal to an axial direction of the capacitor (27), wherein the container body (21) is mounted on the box body of the housing (10) such that the opening section (21a) is covered by the closing section (14), which is part of the housing (10), and wherein the capacitor (27) is sandwich-like enclosed and held between the closure section (14) and a bottom section (21b) of the container body (21) which is arranged on a side opposite the side with the opening section (21a), wherein the capacitor (27) is elastically prestressed against the bottom section (21b) by a damping material (40) which is elastically deformable and is arranged between the closure section (14) and the capacitor (27). [2] Servo drive (1) according to claim 1, wherein the damping material (40) is attached either to the closure section (14) or to the capacitor (27). [3] Servo drive (1) according to claim 1 or 2, wherein the container body (21) has a plurality of projections (23, 25) which project in a direction orthogonal to a direction in which the opening section (21a) and the bottom section (21b) are aligned with each other, wherein a plurality of holes (16, 18) are provided in a section of the box body, facing the container body (21) in the direction orthogonal to the direction in which the opening section (21a) and the bottom section (21b) are oriented to each other, and wherein the container body (21) is attached to the box body by the plurality of projections (23, 25) which are fitted into the plurality of holes (16, 18). [4] Servo drive (1) according to one of claims 1 to 3, comprising: an electricity storage state detection unit (29) provided with a detection circuit that detects an electricity storage state of the capacitor (27) by measuring a potential difference between a pair of connecting terminals (27a) of the capacitor (27), and a light-emitting body (29b) that indicates a detection result obtained from the detection circuit by lighting up or not lighting up, wherein the electricity storage state detection unit (29) is mounted on the container body (21) and a display window part (15) which allows visual detection from the outside as to whether the light-emitting body (29b) is illuminated or not is provided in the housing (10). [5] Servo drive (1) according to one of claims 1 to 4, wherein the capacitor (27) and a circuit element component that is to be electrically connected to the capacitor (27) are connected by a bus rail, and wherein the bus rail is divided into a capacitor-side bus rail (28A, 28B) having one end connected to the capacitor (27) and a circuit-element-side bus rail (31A, 31B) having one end connected to the circuit-element component and the other end connected to the other end of the capacitor-side bus rail (28A, 28B). [6] Servo drive (1) according to one of claims 1 to 5, wherein the container body (21) is made of an insulating resin element. [7] Servo drive (1) according to one of claims 1 to 6, wherein the damping material (40) is made from a damping sheet with high thermal conductivity.

Images