WO2021053844A1 - Servo driver - Google Patents

Abstract

Provided is a servo driver (1) comprising first through third heat emitting components (30, 40, 50), a heat sink (20), and a casing (10). The heat sink (20) comprises a first plate-shaped part (21), a second plate-shaped part (22) rising up from one end part of the first plate-shaped part (21), and a third plate-shaped part (23) rising up from the other end part of the first plate-shaped part (21). An inner space is disposed to the inner side of the heat sink (20). The first heat emitting component (30) is mounted so as to make thermal contact with the first plate-shaped part (21). The second heat emitting component (40) is mounted so as to make thermal contact with the second plate-shaped part (22). The third heat emitting component (50) is mounted so as to make thermal contact with the third plate-shaped part (23). Radiator fins are disposed on at least one of the first through third plate-shaped parts (21, 22, 23) so as to protrude toward the inner space.

Description

Servo driver

The present disclosure relates to a servo driver for controlling the operation of a servo motor.

The servo driver controls the operation of the servomotor according to the command from the host controller, and more specifically, it controls the output torque, rotation speed, position, etc. of the servomotor. The servo driver is equipped with an inverter equipped with a converter circuit, a smoothing circuit, an inverter circuit, a control circuit, a regenerative resistor, etc. in order to supply an appropriate amount of electric power to the servomotor at an appropriate timing. The AC power adjusted to an arbitrary frequency is supplied to the servomotor.

Here, among the inverters, the power module that constitutes the inverter circuit, the diode module that constitutes the converter circuit, and the regenerative resistor are heat-generating components that generate a particularly large amount of heat when energized, and dissipate heat appropriately. Is indispensable. Therefore, in order to efficiently dissipate the heat generated by these power modules, diode modules and regenerative resistors, a heat sink is usually installed in the servo driver.

Generally, in a servo driver, a power module and a diode module made of package parts are assembled on one surface of a heat sink so as to be arranged side by side, and on a peripheral portion (for example, a fin portion) which is a portion adjacent to the one surface of the heat sink. , Regenerative resistors consisting of package parts are often placed. By adopting this configuration, the heat generated in the power module, the diode module and the regenerative resistor is appropriately dissipated to the outside through the heat sink.

Documents in which such a configuration is disclosed include, for example, Japanese Patent Application Laid-Open No. 2012-138485 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2019-12772 (Patent Document 2). Here, the servo driver disclosed in Japanese Patent Application Laid-Open No. 2012-138485 uses a part of the wall portion of the housing as a heat sink, and the servo driver disclosed in Japanese Patent Application Laid-Open No. 2019-12772 is a servo driver disclosed in JP-A-2019-12772. A heat sink is installed inside the housing.

Japanese Unexamined Patent Publication No. 2012-138485 Japanese Unexamined Patent Publication No. 2019-12772

However, when the above-mentioned conventionally known configurations are adopted, the occupied volume of the structure including the power module, the diode module, the regenerative resistor and the heat sink becomes large, and the servo driver can be downsized. It becomes a big obstacle. That is, the conventionally known configuration still has room for improvement from the viewpoint of occupied volume and heat dissipation efficiency, and improvement thereof is strongly demanded.

Therefore, the present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide a servo driver whose heat dissipation efficiency is kept good and whose size is reduced as compared with the conventional one.

A servo driver according to an aspect of the present disclosure is for controlling the operation of a servomotor, and includes a first heat generating component, a second heat generating component, a third heat generating component, a heat sink, and a housing. ing. Each of the first heat-generating component, the second heat-generating component, and the third heat-generating component generates heat when energized. The heat sink is for dissipating heat generated by the first heat generating component, the second heat generating component, and the third heat generating component. The heat sink, the first heat-generating component, the second heat-generating component, and the third heat-generating component are housed in the housing. The heat sink includes a first plate-shaped portion, a second plate-shaped portion, and a third plate-shaped portion. The second plate-shaped portion is erected from one end of the first plate-shaped portion in the second direction orthogonal to the first direction, which is the thickness direction of the first plate-shaped portion, and the above-mentioned in the second direction. By erection of the third plate-shaped portion from the other end of the first plate-shaped portion, at least the first plate-shaped portion, the second plate-shaped portion, and the third plate are inside the heat sink. In addition to being defined by the shape portion, an internal space is provided in which both ends are open in the third direction orthogonal to both the first direction and the second direction. The first heat generating component is assembled to the first plate-shaped portion so as to be in thermal contact with the first main surface of the first plate-shaped portion located on the side opposite to the main surface defining the internal space. It is attached. The second heat generating component is assembled to the second plate-shaped portion so as to be in thermal contact with the second main surface of the second plate-shaped portion located on the side opposite to the main surface defining the internal space. It is attached. The third heat generating component is assembled to the third plate-shaped portion so as to be in thermal contact with the third main surface of the third plate-shaped portion located on the side opposite to the main surface defining the internal space. It is attached. At least one of the first plate-shaped portion, the second plate-shaped portion, and the third plate-shaped portion is provided with heat-dissipating fins so as to project toward the internal space.

With this configuration, the first heat-generating component, the second heat-generating component, and the third heat-generating component can be assembled to the heat sink on the three surfaces of the first main surface, the second main surface, and the third main surface provided on the heat sink. The heat dissipation fins are arranged inside the first plate-shaped portion, the second plate-shaped portion, and the third plate-shaped portion that define each of the first main surface, the second main surface, and the third main surface. It becomes possible to form an internal space, which is a space for the heat sink. Therefore, it is possible to reduce the occupied volume of the structure including the first heat generating component, the second heat generating component, the third heat generating component, and the heat sink. Therefore, it is possible to obtain a servo driver that is smaller than the conventional one while maintaining good heat dissipation efficiency.

In the servo driver according to the above-described aspect of the present disclosure, the heat-dissipating fin may include the first heat-dissipating fin provided in the first plate-shaped portion, and in that case, the first heat-dissipating fin may be included. The amount of heat generated by the heat-generating component may be larger than the amount of heat generated by each of the second heat-generating component and the third heat-generating component.

In this way, by providing the heat radiating fins in the first plate-shaped portion to which the first heat generating component having the largest heat generating amount is assembled, the heat generated by the first heat generating component can be radiated more efficiently. It will be possible. Here, since the first plate-shaped portion is directly connected to both the second plate-shaped portion and the third plate-shaped portion, a part of the heat generated by the first heat generating component is the first plate. Heat is also transferred to the second plate-shaped portion and the third plate-shaped portion via the shaped portion. Therefore, heat can be dissipated more efficiently than when the first heat generating component having the largest heat generation amount is attached to either the second plate-shaped portion or the third plate-shaped portion.

In the servo driver according to the above-described aspect of the present disclosure, the heat-dissipating fins are the second heat-dissipating fins provided on the second plate-shaped portion and the third heat-dissipating fins provided on the third plate-shaped portion. In that case, the surface area of the first heat radiation fin may be larger than the surface area of each of the second heat radiation fin and the third heat radiation fin.

In this way, the surface area of the heat radiating fins provided in the first plate-shaped portion to which the first heat generating component having the largest heat generation is assembled is relatively large, and the second heat generating component and the second heat generating component having a relatively small heat generation amount are relatively large. 3 By relatively reducing the surface area of the heat-dissipating fins provided on the second plate-shaped portion and the third plate-shaped portion to which the heat-generating components are assembled, heat can be dissipated more efficiently.

In the servo driver according to the above aspect of the present disclosure, the second plate-shaped portion and the third plate-shaped portion may both be positioned so as to be orthogonal to the first plate-shaped portion. ..

With this configuration, the occupied volume of the structure including the first heat generating component, the second heat generating component, the third heat generating component, and the heat sink can be reliably reduced, and the rigidity of the heat sink itself can be increased. You can also.

In the servo driver according to the above aspect of the present disclosure, the heat radiation fin may have a plurality of fin portions extending along the third direction.

With this configuration, it is possible to form a plurality of air flow paths extending along the third direction in the internal space in which both ends are open in the third direction, so that the surface area of the heat sink can be increased. While increasing the number, smooth air flow in the internal space can be realized, and efficient heat dissipation can be performed.

In the servo driver according to the above aspect of the present disclosure, the internal space may have an accommodation space in which the heat radiation fin is not provided on one end side in the third direction. In some cases, a blower may be installed in the accommodation space.

With such a configuration, the air is forced to flow in the internal space by the blower, so that the heat dissipation performance can be further improved.

In the servo driver according to the above aspect of the present disclosure, the heat sink may be assembled to the housing so that the third direction coincides with the vertical direction of the housing.

With this configuration, the air warmed by receiving the heat from the heat sink becomes an updraft and flows through the internal space, so the air efficiently flows from the vertical lower side with respect to the internal space. The air flows in and the air efficiently flows out from the internal space toward the vertically upper side, so that efficient heat dissipation can be performed.

In the servo driver according to the above aspect of the present disclosure, the housing of the portion facing the internal space in the third direction may be provided with a vent leading to the outside of the housing. ..

With this configuration, it is possible to prevent the air flow along the third direction from being blocked by the housing, and efficient heat dissipation can be performed.

In the servo driver according to the above aspect of the present disclosure, the internal space is closed by the housing of the portion located on the side opposite to the side where the first plate-shaped portion is located when viewed from the internal space. The heat sink may be attached to the housing so as to be used.

With this configuration, the internal space can be closed in the circumferential direction of the heat sink in which the first plate-shaped portion, the second plate-shaped portion, and the third plate-shaped portion are lined up, so that the air flowing through the internal space can be closed. It becomes possible to rectify this without causing disturbance in the air, and efficient heat dissipation can be performed.

In the servo driver according to the above aspect of the present disclosure, at least the first plate-shaped portion, the second plate-shaped portion, and the third plate-shaped portion of the heat sink are formed by extrusion molding. It may be composed of a single member.

With this configuration, the heat sink can be manufactured easily and at low cost, and the manufacturing cost of the servo driver can be reduced.

In the servo driver according to the above aspect of the present disclosure, the first heat generating component may be a power module constituting an inverter circuit, and the second heat generating component may be a diode module constituting a converter circuit. The third heat generating component may be a regenerative resistor.

With this configuration, the heat generated by the power module, diode module, and regenerative resistor, which are heat-generating components that generate a particularly large amount of heat, can be efficiently dissipated using a heat sink, resulting in good heat dissipation. It can be a servo driver with performance.

In the servo driver according to the above aspect of the present disclosure, even if a recess is provided in the third main surface and a cover member is assembled in the third plate-shaped portion so as to cover the recess. In that case, the resistor main body of the regenerative resistor may be housed in the recess so as to abut the bottom surface of the recess.

In this way, by configuring the resistor body of the regenerative resistor to be in direct thermal contact with the heat sink, the package of the regenerative resistor is compared to the case where the regenerative resistor consisting of package parts is assembled to the heat sink. It is possible to improve the heat dissipation performance by the amount that does not intervene, and more efficient heat dissipation can be realized.

According to the present disclosure, it is possible to obtain a servo driver that is smaller than the conventional one while maintaining good heat dissipation efficiency.

It is a perspective view of the servo driver which concerns on embodiment. It is a perspective view when the servo driver shown in FIG. 1 is seen from another direction. It is a perspective view which omitted the illustration of a part of the housing of the servo driver shown in FIG. 1 and a part of internal components. It is a top view which omitted the illustration of a part of the housing of the servo driver shown in FIG. 1 and a part of internal components. It is a left side view which omitted the illustration of a part of the housing of the servo driver shown in FIG. 1 and a part of internal components. 3 is a perspective view of a structure including a heat sink, a power module, a diode module, and a regenerative resistor shown in FIGS. 3 to 5. It is a top view of the structure shown in FIG. It is an exploded perspective view which shows the assembly structure of the main part of the servo driver shown in FIG.

Hereinafter, the embodiment will be described in detail with reference to the figure. In the embodiments shown below, the same or common parts are designated by the same reference numerals in the drawings, and the description thereof will not be repeated.

<A. Approximate configuration of servo driver>
FIG. 1 is a perspective view of the servo driver according to the embodiment as viewed from diagonally upper right on the front side, and FIG. 2 is a perspective view of the servo driver as viewed from diagonally lower left on the rear side. 3 to 5 are a perspective view, a plan view, and a left side view, respectively, in which a part of the housing of the servo driver shown in FIG. 1 and a part of internal components are not shown. First, a schematic configuration of the servo driver 1 according to the present embodiment will be described with reference to FIGS. 1 to 5.

Here, the internal components (not shown) in FIGS. 3 to 5 are mainly electronic parts and the like excluding the power module 30 and the diode module 40, which will be described later, and the housings (not shown) in FIGS. 3 and 5. A part of the front wall 10a, the left side wall 10c, the right side wall 10d and the upper wall 10e (see FIGS. 1 and 2), which will be described later, and a part of the housing 10 (not shown in FIG. 4) will be described later. The right side wall 10d and the upper wall 10e (see FIGS. 1 and 2).

As shown in FIGS. 1 to 5, the servo driver 1 is an electronic device having a substantially rectangular parallelepiped outer shape, and is composed of a housing 10 and various internal components housed inside the housing 10. ing. The servo driver 1 controls the operation of a servomotor (not shown) by following a command from a host controller (not shown), and more specifically, controls the output torque, rotation speed, position, etc. of the servomotor. Is.

The servo driver 1 includes 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 inside the housing 10 described above include these converter circuits, smoothing circuits, inverter circuits, control circuits, regenerative resistors, and the like that make up the inverter. The inverter circuit is mainly composed of the power module 30 described later, and the converter circuit is mainly composed of the diode module 40 described later.

As shown in FIGS. 1 and 2, the housing 10 has a front wall 10a and a rear wall 10b located in the front and rear, a left side wall 10c and a right side wall 10d located in the left and right, and an upper wall 10e and a lower wall located in the upper and lower sides. It has a wall 10f. It is intended that the servo driver 1 is installed on a wall surface of a control panel or the like in a wall-mounted state. Therefore, the rear wall 10b of the housing 10 has a fixing hole for fixing the servo driver 1 to the wall surface. The part etc. are provided.

Here, in the following description, the directions in which the front wall 10a and the rear wall 10b are located when viewed from the central portion of the servo driver 1 are referred to as the X1 direction and the X2 direction, respectively, and are directions that match the X1 direction and the X2 direction, respectively. A certain front-back direction is also referred to as an X-axis direction. Further, the directions in which the left side wall 10c and the right side wall 10d are located when viewed from the central portion of the servo driver 1 are referred to as the Y1 direction and the Y2 direction, respectively, and the left-right direction, which is a direction matching these Y1 and Y2 directions, is the Y-axis direction. Also called. Further, the directions in which the upper wall 10e and the lower wall 10f are located when viewed from the central portion of the servo driver 1 are referred to as the Z1 direction and the Z2 direction, respectively, and the vertical direction, which is a direction corresponding to the Z1 direction and the Z2 direction, is the Z axis direction. Also called.

In the present embodiment, the first direction, which is the thickness direction of the first plate-shaped portion 21 of the heat sink 20 (see FIGS. 3 to 5 and the like) described later, coincides with the Y-axis direction and is the first. In the present embodiment, the second direction orthogonal to the direction coincides with the X-axis direction, and the third direction orthogonal to both the first direction and the second direction is Z in the present embodiment. It matches the axial direction.

The housing 10 is composed of a box body including the front wall 10a, the rear wall 10b, the left side wall 10c, the right side wall 10d, the upper wall 10e and the lower wall 10f, and the front wall 10a, the upper wall 10e and the lower wall 10e. The wall 10f is provided with various connection terminals for connecting to the above-mentioned host controller, servomotor, or the like. Further, the upper wall 10e and the lower wall 10f of the housing 10 are provided with a large number of vents 11 over the entire surface thereof, and the space inside the housing 10 and the outside of the housing 10 are provided through the vents 11. It communicates with the space of.

At a predetermined position on the front wall 10a of the housing 10, a display window portion 12 for indicating the storage state of the capacitors constituting the smoothing circuit of the inverter described above is provided. Behind the display window portion 12, for example, a light emitting body made of an LED (Light Emitting Diode) or the like is provided. As a result, when the light emitting body is turned on, the light emitted from the light emitting body is emitted to the outside through the display window portion 12, and the user can determine whether or not the light emitting body is turned on. It is configured to be visible. The illuminant turns on when the capacitor is in a stored state, and turns off when the capacitor is in a sufficiently discharged state.

As shown in FIGS. 3 to 5, a space in which the above-mentioned various internal components are housed is provided inside the housing 10. A heat sink 20 is arranged in the space, and the power module 30 constituting the above-mentioned inverter circuit, the diode module 40 constituting the above-mentioned converter circuit, and the above-mentioned regenerative resistor 50 are arranged in the heat sink. It is assembled.

By assembling the power module 30, the diode module 40 and the regenerative resistor 50 to the heat sink 20 in this way, the heat sink 20, the power module 30, the diode module 40 and the regenerative resistor 50 are combined into one structure (subassembly). ). The structure is arranged in the left back part of the space inside the housing 10 so as to be adjacent to the rear wall 10b and the left side wall 10c of the housing 10.

The power module 30 corresponds to the first heat generating component that generates heat when energized, and is configured as a package component including a switching element and a diode element inside. The power module 30 constitutes an inverter circuit that converts DC power into AC power, has a heat radiating plate at the bottom thereof, and has a plurality of connection terminals on the top surface thereof. The power module 30 may be an IPM (Intelligent Power Module) provided with a control board provided with a control circuit for controlling the on / off operation of the switching element.

The diode module 40 corresponds to a second heat generating component that generates heat when energized, and is configured as a package component containing a diode element inside. The diode module 40 constitutes a converter circuit that converts AC power into DC power, has a heat dissipation plate at the bottom thereof, and has a plurality of connection terminals on the top surface thereof.

The regenerative resistor 50 corresponds to a third heat generating component that generates heat when energized, and is composed of, for example, a cement resistor. The regenerative resistor 50 is for absorbing the surplus portion of the regenerative energy generated by the servomotor (that is, the surplus regenerative energy that cannot be completely absorbed by the regenerative processing circuit separately provided in the servo driver 1). It has a resistor body in which a metal winding is sealed with cement, and a connection terminal drawn from the resistor body.

As the regenerative resistor 50, one made of package parts (that is, one in which the above-mentioned resistor main body is housed inside a package provided with a heat sink, etc.) can also be used, but the present embodiment In, the above-mentioned resistor main body is directly assembled to the heat sink 20, so that the package is omitted. The detailed structure will be described later.

The heat sink 20 is for dissipating heat generated by the power module 30, the diode module 40, and the regenerative resistor 50. The power module 30, the diode module 40, and the regenerative resistor 50 generate remarkably heat when energized as compared with other electronic components included in the servo driver 1, and heat dissipation by the heat sink 20 is indispensable.

Therefore, as described above, the power module 30, the diode module 40, and the regenerative resistor 50 are assembled to the heat sink 20, and the heat sink 20 dissipates heat. Therefore, the heat sink 20 is preferably made of a metal member having excellent thermal conductivity, and in the present embodiment, it is made of an aluminum alloy member.

Normally, the power module 30 has the largest calorific value among the power module 30, the diode module 40, and the regenerative resistor 50. Therefore, when designing the heat dissipation of the power module 30, the diode module 40, and the regenerative resistor 50, it is important to consider that the power module 30 dissipates heat particularly efficiently.

<B. Heat sink structure and its vicinity>
FIG. 6 is a perspective view of a structure including the above-mentioned heat sink, power module, diode module, and regenerative resistor. Here, FIG. 6A is a perspective view of the structure viewed from diagonally upper right on the front side, and FIG. 6B is a perspective view of the structure viewed from diagonally lower left on the rear side. FIG. 7 is a plan view of the structure shown in FIG. Further, FIG. 8 is an exploded perspective view showing an assembled structure of a main part of the servo driver shown in FIG. Next, with reference to FIGS. 3 to 5 and FIGS. 6 to 8 described above, the structure of the heat sink 20 in the servo driver 1 according to the present embodiment and the configuration in the vicinity thereof will be described in detail.

As shown in FIGS. 3 to 8, the heat sink 20 includes a first plate-shaped portion 21, a second plate-shaped portion 22, and a third plate-shaped portion 23. The first plate-shaped portion 21 extends along the XZ plane so that its thickness direction coincides with the Y-axis direction (that is, the first direction). The second plate-shaped portion 22 is erected from one end portion (that is, the end portion on the X1 direction side) of the first plate-shaped portion 21 in the X-axis direction (that is, the second direction) toward the Y2 direction, and has a thickness thereof. It extends along the YZ plane so that the direction coincides with the X-axis direction. The third plate-shaped portion 23 is erected from the other end portion (that is, the end portion on the X2 direction side) of the first plate-shaped portion 21 in the X-axis direction (that is, the second direction) toward the Y2 direction. It extends along the YZ plane so that the thickness direction coincides with the X-axis direction. That is, the second plate-shaped portion 22 and the third plate-shaped portion 23 are both positioned so as to be orthogonal to the first plate-shaped portion 21.

As a result, the inside of the heat sink 20 is defined by the first plate-shaped portion 21, the second plate-shaped portion 22, and the third plate-shaped portion 23, and both ends in the Z-axis direction (that is, the third direction) are opened. The internal space is formed. Further, although the heat sink 20 of the portion located on the side opposite to the side where the first plate-shaped portion 21 is located when viewed from the internal space is open to the outside, the housing 10 covers the portion. Due to the location of the left side wall 10c, it is closed by the left side wall 10c (see FIG. 4).

Therefore, in the servo driver 1 according to the present embodiment, the third direction, which is the direction in which the internal space provided inside the heat sink 20 extends, coincides with the Z-axis direction, which is the vertical direction of the servo driver 1. As described above, the heat sink 20 is housed inside the housing 10.

Here, a plurality of screw holes are provided on the rear end surface of the heat sink 20 (that is, the end surface on the X2 direction side of both end surfaces located in the X-axis direction), and the upper end surface and the lower end surface (that is, the end surface of the heat sink 20). That is, a plurality of screw holes are provided on both end faces located in the Z-axis direction, respectively, and the left end face of the heat sink 20 (that is, the end face on the Y1 direction side of both end faces located in the Y-axis direction). Is provided with a plurality of screw holes. Further, the rear wall 10b, the upper wall 10e, the lower wall 10f, and the left side wall 10c of the housing 10 are provided with through holes corresponding to these screw holes provided in the heat sink 20.

As a result, screws are inserted from the outside of the housing 10 so as to insert these through holes, and the screws are screwed into the screw holes described above, so that the heat sink 20 is fixed to the housing 10 and the housing is formed. It will be assembled for 10. The screws indicated by reference numerals 60 in FIGS. 1, 2, 4, 5 and 8 described later correspond to the screws for fixing the heat sink 20 to the housing 10.

The first plate-shaped portion 21 of the heat sink 20 has an inner main surface that defines the internal space of the heat sink 20 described above, and a first main surface 21a that is an outer main surface located on the opposite side of the inner main surface. are doing. A power module 30 is fixed to the first main surface 21a, whereby the power module 30 is assembled to the first plate-shaped portion 21 of the heat sink 20.

More specifically, the first main surface 21a is provided with a pair of screw holes so that the heat radiating plate provided at the bottom of the power module 30 is in thermal contact with the first main surface 21a. Is addressed to the first plate-shaped portion 21, and in this state, the power module 30 is fixed to the first main surface 21a by screwing the screws 31 into the pair of screw holes (see particularly FIG. 8 and the like). ).

A heat radiating grease or a heat radiating sheet may be interposed between the heat radiating plate of the power module 30 and the first plate-shaped portion 21 of the heat sink 20. With this configuration, the heat sink 20 can more efficiently dissipate the heat generated by the power module 30.

The second plate-shaped portion 22 of the heat sink 20 has an inner main surface that defines the internal space of the heat sink 20 described above, and a second main surface 22a that is an outer main surface located on the opposite side of the inner main surface. are doing. A diode module 40 is fixed to the second main surface 22a, whereby the diode module 40 is assembled to the second plate-shaped portion 22 of the heat sink 20.

More specifically, the second main surface 22a is provided with a pair of screw holes so that the heat radiating plate provided at the bottom of the diode module 40 is in thermal contact with the second main surface 22a. Is addressed to the second plate-shaped portion 22, and in this state, the diode module 40 is fixed to the second main surface 22a by screwing the screws 41 into the pair of screw holes (see particularly FIG. 8 and the like). ).

A heat radiating grease or a heat radiating sheet may be interposed between the heat radiating plate of the diode module 40 and the second plate-shaped portion 22 of the heat sink 20. With this configuration, the heat sink 20 can more efficiently dissipate the heat generated by the diode module 40.

The third plate-shaped portion 23 of the heat sink 20 has an inner main surface that defines the internal space of the heat sink 20 described above, and a third main surface 23a that is an outer main surface located on the opposite side of the inner main surface. are doing. The third main surface 23a contains a recess 23d (not shown in FIGS. 3 to 7 and not shown in FIG. 8) of the regenerative resistor 50 described above. (See FIG. 8) is provided, whereby the regenerative resistor 50 is assembled to the third plate-shaped portion 23 of the heat sink 20.

More specifically, a pair of standing wall portions 23c extending along the Z-axis direction are provided at both ends of the third main surface 23a of the third plate-shaped portion 23 in the Y-axis direction. A groove-shaped recess 23d located between the pair of standing wall portions 23c is formed on the three main surfaces 23a (see particularly FIG. 8 and the like). Cover members 24a to 24c are assembled to the third plate-shaped portion 23 by screws 51 so as to close the groove-shaped recess 23d, whereby the recess 23d is configured as a substantially closed space. (In particular, see FIG. 6 (B) and FIG. 8 and the like). The cover members 24a and 24b close a pair of open ends located in the extending direction of the groove-shaped recess 23d (that is, a pair of open ends located in the Z-axis direction of the recess 23d), and the cover member The 24c closes the open end on the top surface side facing the bottom surface of the recess 23d (that is, the open end located on the X2 direction side of the recess 23d).

The resistor main body of the regenerative resistor 50 is housed in a recess 23d provided on the third main surface 23a of the third plate-shaped portion 23, and is pressed by the cover member 24c to press the bottom surface of the recess 23d. It is in contact with the third main surface 23a of the specified portion. As a result, the regenerative resistor 50 is integrally assembled to the third plate-shaped portion 23 of the heat sink 20, and the regenerative resistor 50 (strictly speaking, the resistor main body) is attached to the third plate-shaped portion 23. It will come into thermal contact with the third main surface 23a. In the present embodiment, the connection terminal of the regenerative resistor 50 described above is pulled out from the through hole provided in the cover member 24b toward the outside (see FIGS. 6B and 8).

Here, in the recess 23d of the heat sink 20 in which the resistor body of the regenerative resistor 50 described above is housed, in addition to the resistor body of the regenerative resistor 50, other heat generating parts may be housed. Examples of the other heat generating component include a dynamic brake resistor and the like.

The above-mentioned inner main surface of the first plate-shaped portion 21 of the heat sink 20 (that is, the main surface opposite to the first main surface 21a to which the power module 30 is assembled) faces the internal space of the heat sink 20. The first heat radiating fin 21b is provided so as to project. The first heat radiation fin 21b has a plurality of fin portions extending along the Z-axis direction (that is, the third direction).

The above-mentioned inner main surface of the second plate-shaped portion 22 of the heat sink 20 (that is, the main surface opposite to the second main surface 22a to which the diode module 40 is assembled) faces the internal space of the heat sink 20. A second heat radiating fin 22b is provided so as to project. The second heat radiation fin 22b has a plurality of fin portions extending along the Z-axis direction (that is, the third direction).

The above-mentioned inner main surface of the third plate-shaped portion 23 of the heat sink 20 (that is, the main surface opposite to the third main surface 23a to which the regenerative resistor 50 is assembled) faces the internal space of the heat sink 20. A third heat radiating fin 23b is provided so as to project. The third heat radiation fin 23b has a plurality of fin portions extending along the Z-axis direction (that is, the third direction).

In this way, by providing the first heat radiation fin 21b, the second heat radiation fin 22b, and the third heat radiation fin 23b protruding toward the internal space of the heat sink 20, the internal space of the heat sink 20 is provided in the Z-axis direction (that is, that is). A plurality of air flow paths extending along the third direction) are formed. With this configuration, smooth air flow in the internal space can be realized while increasing the surface area of the heat sink 20, and efficient heat dissipation can be performed.

Here, the protruding amount of each of the plurality of fin portions included in the first heat radiating fin 21b is significantly larger than the protruding amount of each of the plurality of fin portions included in the second heat radiating fin 22b and the third heat radiating fin 23b. Each of the tip portions of the plurality of fin portions included in the first heat radiation fin 21b is a portion located on the side opposite to the side on which the first plate-shaped portion 21 is located when viewed from the internal space of the heat sink 20. It reaches the open end of the heat sink 20 of.

With this configuration, the surface area of the first heat radiating fin 21b can be made significantly larger than the surface area of each of the second heat radiating fin 22b and the third heat radiating fin 23b, and the heat sink 20 is assembled. The heat generated by the power module 30, which is the heat generating component having the largest heat generation amount among the power module 30, the diode module 40, and the regenerative resistor 50, can be effectively dissipated.

The heat sink 20 is preferably made of an extruded product formed by extruding. With this configuration, the heat sink 20 can be easily manufactured at low cost, and the manufacturing cost of the servo driver 1 can be reduced. However, it may be difficult to form a fin portion having an extremely large amount of protrusion by extrusion molding.

Therefore, in the present embodiment, among the heat sinks 20, the first plate-shaped portion 21, the second plate-shaped portion 22, and the third plate-shaped portion 23, and the second heat-dissipating fin 22b and the second heat-dissipating fin 22b having a relatively small protrusion amount. The three heat radiating fins 23b are composed of a single member formed by extrusion molding, and each of the plurality of fin portions included in the first heat radiating fin 21b having an extremely large protrusion amount is formed of the single member. It is composed of a plurality of plate-shaped members that are separate from the members of the above, and each of the plurality of plate-shaped members is inserted into a plurality of groove-shaped portions provided on the inner main surface of the first plate-shaped portion 21. By crimping and fixing these individually, it is possible to manufacture the heat sink 20 having the above-mentioned shape. In this way, the manufacturing cost can be significantly reduced as compared with the case where the heat sink 20 is manufactured based on another manufacturing method (for example, cutting).

On the one end side in the Z-axis direction of the internal space of the heat sink 20 (more strictly, the end side on the Z2 direction side where the lower wall 10f of the housing 10 is located), the above-mentioned first heat radiation fins 21b, A storage space 25 is provided in which neither the second heat radiating fin 22b nor the third heat radiating fin 23b is provided. A blower 26 is installed in the accommodation space 25. More specifically, the blower 26 is fixed to the lower wall 10f of the housing 10 by screws 61, and the heat sink 20 is assembled to the housing 10 so as to cover the blower 26 (FIGS. 5 and 8). Etc.).

As a result, the blower 26 is arranged on one end side of the above-mentioned plurality of air flow paths provided in the internal space of the heat sink 20 by providing the plurality of fin portions, and the blower 26 is driven. As a result, air is forced to flow in the internal space of the heat sink 20. Therefore, with such a configuration, the heat dissipation efficiency can be further improved.

Here, as described above, the upper wall 10e and the lower wall 10f of the housing 10 are provided with a large number of vents 11 above the portion facing the internal space of the heat sink 20 along the Z-axis direction. The wall 10e and the lower wall 10f are also provided with a plurality of vents 11. With such a configuration, it is possible to prevent the air flow along the Z-axis direction from being blocked by the housing 10, and efficient heat dissipation can be performed.

Further, as described above, the heat sink 20 is provided in the housing 10 so that the extending direction of the plurality of air flow paths formed in the internal space of the heat sink 20 matches the Z-axis direction which is the vertical direction of the servo driver 1. It is assembled. With this configuration, the air warmed by receiving the heat from the heat sink 20 becomes an updraft and flows through the internal space, so that the air is efficient from the vertically lower side with respect to the internal space. Inflow, and the air efficiently flows out from the internal space toward the vertically upper side. Therefore, heat can be dissipated more efficiently.

Further, as described above, the open end of the heat sink 20 at the portion located on the side opposite to the side where the first plate-shaped portion 21 is located when viewed from the internal space of the heat sink 20 is formed by the left side wall 10c of the housing 10. It is closed. With this configuration, the internal space of the heat sink 20 can be completely closed in the circumferential direction of the heat sink 20 in which the first plate-shaped portion 21, the second plate-shaped portion 22, and the third plate-shaped portion 23 are arranged. Therefore, it is possible to rectify the air flowing in the internal space without causing turbulence, and efficient heat dissipation can be performed in this respect as well.

<C. Summary>
As described above, by using the servo driver 1 according to the present embodiment, the power module 30 is provided on the three surfaces of the first main surface 21a, the second main surface 22a, and the third main surface 23a provided on the heat sink 20. The diode module 40 and the regenerative resistor 50 can be assembled to the heat sink 20, respectively, and the first plate-shaped portion that defines each of the first main surface 21a, the second main surface 22a, and the third main surface 23a. 21, It is possible to form an internal space that is a space for arranging the first heat radiating fin 21b, the second heat radiating fin 22b, and the third heat radiating fin 23b inside the second plate-shaped portion 22 and the third plate-shaped portion 23. It will be possible. Therefore, the occupied volume of the structure including the power module 30, the diode module 40, the regenerative resistor 50, and the heat sink 20 can be made small, and the size of the structure can be reduced as compared with the conventional one while maintaining good heat dissipation efficiency. Can be the servo driver 1 designed with the above.

Further, in the servo driver 1 according to the present embodiment, as described above, the heat sink 20 in which the second plate-shaped portion 22 and the third plate-shaped portion 23 are both orthogonal to the first plate-shaped portion 21 is used. It is supposed to be. With this configuration, the occupied volume of the structure including the power module 30, the diode module 40, the regenerative resistor 50, and the heat sink 20 can be reliably reduced, and the rigidity of the heat sink 20 itself can be increased. You can also.

Further, in the servo driver 1 according to the present embodiment, as described above, the first heat dissipation is formed on the first plate-shaped portion 21 to which the power module 30 having the largest heat generation amount is assembled. The fins 21b are provided so that the heat generated by the power module 30 can be efficiently dissipated. Here, since the first plate-shaped portion 21 has a configuration in which it is directly connected to both the second plate-shaped portion 22 and the third plate-shaped portion 23, a part of the heat generated by the power module 30 is generated. The heat is also transferred to the second plate-shaped portion 22 and the third plate-shaped portion 23 via the first plate-shaped portion 21, and more efficient heat dissipation can be realized in this respect as well.

<D. Addendum>
The characteristic configuration of the servo driver 1 according to the present embodiment described above can be summarized as follows.
[Structure 1]
A servo driver for controlling the operation of the servo motor.
The first heat-generating component (30), the second heat-generating component (40), and the third heat-generating component (50), each of which generates heat when energized,
A heat sink (20) for dissipating heat generated by the first heat-generating component, the second heat-generating component, and the third heat-generating component.
The heat sink, the first heat-generating component, the second heat-generating component, and the housing (10) in which the third heat-generating component is housed are provided.
The heat sink includes a first plate-shaped portion (21), a second plate-shaped portion (22), and a third plate-shaped portion (23).
The second plate-shaped portion is erected from one end of the first plate-shaped portion in a second direction orthogonal to the first direction, which is the thickness direction of the first plate-shaped portion, and the second plate-shaped portion is erected from the one end portion. By erection of the third plate-shaped portion from the other end of the first plate-shaped portion, at least the first plate-shaped portion, the second plate-shaped portion, and the third plate are inside the heat sink. In addition to being defined by the shape, an internal space is provided in which both ends are open in the third direction orthogonal to both the first direction and the second direction.
The first plate shape is such that the first heat generating component is in thermal contact with the first main surface (21a) located on the opposite side of the first plate shape portion from the main surface defining the internal space. Assembled in the department,
The second plate shape is such that the second heat generating component is in thermal contact with the second main surface (22a) of the second plate shape portion located on the side opposite to the main surface defining the internal space. Assembled in the department,
The third plate shape is such that the third heat generating component is in thermal contact with the third main surface (23a) located on the side opposite to the main surface defining the internal space of the third plate shape portion. Assembled in the department,
A servo driver in which at least one of the first plate-shaped portion, the second plate-shaped portion, and the third plate-shaped portion is provided with heat-dissipating fins so as to project toward the internal space. ..
[Structure 2]
The heat radiating fin includes a first heat radiating fin (21b) provided in the first plate-shaped portion.
The servo driver according to configuration 1, wherein the heat generation amount of the first heat generation component is larger than the heat generation amount of each of the second heat generation component and the third heat generation component.
[Structure 3]
The radiating fins include a second radiating fin (22b) provided on the second plate-shaped portion and a third radiating fin (23b) provided on the third plate-shaped portion.
The servo driver according to configuration 2, wherein the surface area of the first heat radiation fin is larger than the surface area of each of the second heat radiation fin and the third heat radiation fin.
[Structure 4]
The servo driver according to any one of configurations 1 to 3, wherein the second plate-shaped portion and the third plate-shaped portion are both located so as to be orthogonal to the first plate-shaped portion.
[Structure 5]
The servo driver according to any one of configurations 1 to 4, wherein the heat radiating fin has a plurality of fin portions extending along the third direction.
[Structure 6]
The internal space has an accommodation space (25) in which the heat radiation fin is not provided on one end side in the third direction.
The servo driver according to any one of configurations 1 to 5, wherein a blower (26) is installed in the accommodation space.
[Structure 7]
The servo driver according to any one of configurations 1 to 6, wherein the heat sink is assembled to the housing so that the third direction coincides with the vertical direction of the housing.
[Structure 8]
The servo driver according to any one of configurations 1 to 7, wherein a vent (11) leading to the outside of the housing is provided in the housing of a portion facing the internal space in the third direction.
[Structure 9]
The heat sink is assembled to the housing so that the internal space is closed by the housing of the portion located on the side opposite to the side where the first plate-shaped portion is located when viewed from the internal space. The servo driver according to any one of configurations 1 to 8.
[Structure 10]
Configurations 1 to 9 in which at least the first plate-shaped portion, the second plate-shaped portion, and the third plate-shaped portion of the heat sink are composed of a single member formed by extrusion molding. Servo driver described in any of.
[Structure 11]
The first heat generating component is a power module constituting an inverter circuit.
The second heat generating component is a diode module constituting a converter circuit.
The servo driver according to any one of configurations 1 to 10, wherein the third heat generating component is a regenerative resistor.
[Structure 12]
A recess (23d) is provided on the third main surface, and a cover member (24a to 24c) is assembled to the third plate-shaped portion so as to cover the recess.
The servo driver according to configuration 11, wherein the resistor main body of the regenerative resistor is housed in the recess so as to abut on the bottom surface of the recess.

<E. Other forms, etc.>
In the above-described embodiment, the case where the second plate-shaped portion and the third plate-shaped portion provided on the heat sink are both configured to be orthogonal to the first plate-shaped portion will be described as an example. However, they do not necessarily have to be orthogonal to the first plate-like portion, nor do they need to be arranged parallel to each other. However, from the viewpoint of space efficiency, it is preferable that these are orthogonal to the first plate-shaped portion.

Further, in the above-described embodiment, a case where heat sinks are provided with heat radiating fins in each of the first plate-shaped portion, the second plate-shaped portion, and the third plate-shaped portion of the heat sink will be described as an example. However, it is not always necessary that all of these are provided with heat sink fins, and it is sufficient that any of these is provided with heat sink fins. Further, when two or more of these heat radiation fins are provided, it is possible to make the protrusion amount of these two or more heat radiation fins the same or have a difference as long as the layout allows. This makes it possible to freely design the heat dissipation performance.

Further, in the above-described embodiment, the case where the blower is installed adjacent to the heat sink has been described as an example, but the installation of the blower is omitted when the amount of heat generated is relatively small. Is also possible. Further, even when the blower is installed, it is not always necessary to provide a storage chamber for accommodating the blower in the internal space of the heat sink, and these may be arranged so that the heat sink and the blower are adjacent to each other.

Further, in the above-described embodiment, the case where the extending direction of the air flow path formed in the internal space of the heat sink is configured to match the vertical direction of the servo driver has been described as an example. , The extending direction of the air flow path may be configured to match the horizontal direction or the diagonal direction of the servo driver.

As described above, the above-described embodiment disclosed this time is an example in all respects and is not restrictive. The technical scope of the present invention is defined by the claims and includes all modifications within the meaning and scope equivalent to the description of the claims.

1 Servo driver, 10 housing, 10a front wall, 10b rear wall, 10c left wall, 10d right wall, 10e upper wall, 10f lower wall, 11 vent, 12 display window, 20 heat sink, 21 first plate Part, 21a 1st main surface, 21b 1st heat sink fin, 22 2nd plate-shaped part, 22a 2nd main surface, 22b 2nd heat radiation fin, 23 3rd plate-shaped part, 23a 3rd main surface, 23b 3rd heat dissipation Fins, 23c vertical wall, 23d recess, 24a to 24c cover member, 25 accommodation space, 26 blower, 30 power module, 31 screw, 40 diode module, 41 screw, 50 regenerative resistor, 51 screw, 60, 61 screw.

Claims (12)

1. A servo driver for controlling the operation of the servo motor.
   The first heat-generating component, the second heat-generating component, and the third heat-generating component, each of which generates heat when energized,
   A heat sink for dissipating heat generated by the first heat-generating component, the second heat-generating component, and the third heat-generating component.
   The heat sink, the first heat-generating component, the second heat-generating component, and the housing in which the third heat-generating component is housed are provided.
   The heat sink includes a first plate-shaped portion, a second plate-shaped portion, and a third plate-shaped portion.
   The second plate-shaped portion is erected from one end of the first plate-shaped portion in a second direction orthogonal to the first direction, which is the thickness direction of the first plate-shaped portion, and the second plate-shaped portion is erected from the one end portion. By erection of the third plate-shaped portion from the other end of the first plate-shaped portion, at least the first plate-shaped portion, the second plate-shaped portion, and the third plate are inside the heat sink. In addition to being defined by the shape, an internal space is provided in which both ends are open in the third direction orthogonal to both the first direction and the second direction.
   The first heat generating component is assembled to the first plate-shaped portion so as to be in thermal contact with the first main surface of the first plate-shaped portion located on the side opposite to the main surface defining the internal space. Attached,
   The second heat generating component is assembled to the second plate-shaped portion so as to be in thermal contact with the second main surface of the second plate-shaped portion located on the side opposite to the main surface defining the internal space. Attached,
   The third heat generating component is assembled to the third plate-shaped portion so as to be in thermal contact with the third main surface of the third plate-shaped portion located on the side opposite to the main surface defining the internal space. Attached,
   A servo driver in which at least one of the first plate-shaped portion, the second plate-shaped portion, and the third plate-shaped portion is provided with heat-dissipating fins so as to project toward the internal space. ..
2. The heat radiating fin includes a first heat radiating fin provided in the first plate-shaped portion.
   The servo driver according to claim 1, wherein the heat generation amount of the first heat generation component is larger than the heat generation amount of each of the second heat generation component and the third heat generation component.
3. The radiating fin includes a second radiating fin provided in the second plate-shaped portion and a third radiating fin provided in the third plate-shaped portion.
   The servo driver according to claim 2, wherein the surface area of the first heat radiation fin is larger than the surface area of each of the second heat radiation fin and the third heat radiation fin.
4. The servo driver according to any one of claims 1 to 3, wherein the second plate-shaped portion and the third plate-shaped portion are both located so as to be orthogonal to the first plate-shaped portion.
5. The servo driver according to any one of claims 1 to 4, wherein the heat radiating fin has a plurality of fin portions extending along the third direction.
6. The internal space has an accommodation space in which the heat radiation fins are not provided on one end side in the third direction.
   The servo driver according to any one of claims 1 to 5, wherein a blower is installed in the accommodation space.
7. The servo driver according to any one of claims 1 to 6, wherein the heat sink is assembled to the housing so that the third direction matches the vertical direction of the housing.
8. The servo driver according to any one of claims 1 to 7, wherein the housing of the portion facing the internal space in the third direction is provided with a vent leading to the outside of the housing.
9. The heat sink is assembled to the housing so that the internal space is closed by the housing of the portion located on the side opposite to the side where the first plate-shaped portion is located when viewed from the internal space. The servo driver according to any one of claims 1 to 8.
10. According to claim 1, at least the first plate-shaped portion, the second plate-shaped portion, and the third plate-shaped portion of the heat sink are composed of a single member formed by extrusion molding. The servo driver according to any one of 9.
11. The first heat generating component is a power module constituting an inverter circuit.
    The second heat generating component is a diode module constituting a converter circuit.
    The servo driver according to any one of claims 1 to 10, wherein the third heat generating component is a regenerative resistor.
12. A recess is provided on the third main surface, and a cover member is assembled to the third plate-shaped portion so as to cover the recess.
    The servo driver according to claim 11, wherein the resistor main body of the regenerative resistor is housed in the recess so as to abut on the bottom surface of the recess.

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