JP2019110220A - Motor control device - Google Patents

Abstract

To provide a motor control device including radiating fins and capable of inhibiting a component arranged around the radiating fins from becoming a high temperature.SOLUTION: A radiation unit 2 is formed in a frame 10 of a motor control device 1. A first substrate 40 and a second substrate 50 are fixed to the frame. The radiation unit 2 comprises a plurality of radiating fins 30, a first flow channel 33 formed between adjacent radiating fins 30 and extending in a vertical direction Y, and a second flow channel 60 crossing the first flow channel 33. The second flow channel 60 lies along an air intake guide 62 arranged in a notch 61 formed in the radiating fins 30, and extends in a direction crossing the first flow channel 33. The air intake guide 62 is formed in a first cover member 21 fixed to the frame 10. The second flow channel 60 communicates with a space S located at one side (+Z direction) in an arrangement direction (Z direction) of the radiating fins 30 with respect to the radiating unit 2, and blows cooling air toward a first heating element 5 arranged in the space S.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a motor control device provided with a radiation fin for cooling a heat generating body.

  An electronic device such as an inverter device or a servo amplifier is provided with a heat radiating structure for cooling because it includes a heat generating body that becomes high temperature when current flows. Patent Document 1 discloses a servo amplifier provided with a radiation fin and a fan for cooling. In patent document 1, the heat | fever of regeneration resistance is transmitted to a radiation fin, and is thermally radiated. Air sucked into the fan flows between the radiation fins and is discharged above and below the servo amplifier.

JP 2012-138485 A

  The cooling structure by the heat dissipating fins transfers the heat from the heat generating body to the heat dissipating fins and blows it along the heat dissipating fins to dissipate the heat. Therefore, there is a problem that components disposed around the heat dissipating fins are exposed to the heat of the heat dissipating fins. In particular, when the heat generating body is disposed around the heat dissipating fins, there is a problem that the heat from the heat dissipating fins is easily transmitted to the heat generating body and the temperature tends to be high.

  In view of the above problems, it is an object of the present invention to suppress the temperature of parts disposed around the radiation fin from becoming high.

  In order to solve the above-mentioned subject, the present invention is a motor which has a circuit board provided with a motor control circuit, a frame provided with a radiating part which arranged a plurality of radiating fins, and a fan which blows air toward the radiating fins. In the control device, the heat dissipation unit includes a first flow path formed between adjacent heat dissipation fins, and a second flow path intersecting the first flow path, and the second flow path includes It is a flow path along the baffle plate which is disposed in the notch formed in the heat dissipation fin or connected to the edge of the notch and extends in the direction intersecting the first flow path, with respect to the heat dissipation portion It communicates with a space located on one side of the radiation fins in the arrangement direction.

  According to the present invention, the air guide plate is disposed or connected to the notch formed in the heat dissipating fin, and the second flow path intersecting the first air flow path formed between the heat dissipating fins is the air guide plate It is formed along the By providing such a baffle plate, the cooling air sent into the first flow passage is diverted by the baffle plate to flow in the direction intersecting the first flow passage, and the heat radiation portion It can be sent out to a space located on one side of the arrangement direction. Therefore, since a part of the cooling air blown into the first flow passage can be blown toward the parts around the heat dissipation part, the parts around the heat dissipation part can be cooled directly by applying the cooling air, It is possible to suppress the temperature of parts around the heat dissipation unit from becoming high. Therefore, while being able to suppress that a product life becomes short by heat, the upper limit of operating environment temperature can be set highly.

  In the present invention, it is preferable that a first heat generating body mounted on the circuit board is provided, and the second flow path communicate with a side where the first heat generating body is located with respect to the heat dissipation portion. In this case, part of the air blown into the first flow passage can be blown toward the first heat generating body, so that the first heat generating body can be prevented from having a high temperature.

  In the present invention, preferably, the notch is formed by notching a part in the height direction of the radiation fin. In this case, the baffle plate is disposed only at a part of the first flow path in the height direction. Therefore, it is possible to suppress the diffusion of the cooling air flowing through the remaining part in the height direction from the first flow path, so it is possible to suppress the reduction of the cooling efficiency and to cool efficiently. Further, the flow rate of the cooling air in the first flow passage and the second flow passage can be adjusted by adjusting the depth of the notch and the height of the air guide plate.

  In the present invention, the notches are formed in two or more of the heat dissipating fins including the heat dissipating fin located closest to the one side among the plurality of heat dissipating fins, and the two or more notches are directed to the one side The fans are arranged in the downstream direction of the air blowing direction by the fan as the fans are directed, and the air guide plate is directed in the downstream direction toward the one side in a range in which the two or more notches are arranged. It is preferable to extend at an angle. As described above, by arranging the notches in the direction in which the air guide plate extends, it is not necessary to make the notches unnecessarily large. Therefore, the reduction of the surface area of the radiation fin can be suppressed, and the reduction of the cooling efficiency can be suppressed.

  In this case, a first virtual line connecting the downstream edges of the two or more notches and a second virtual line connecting the upstream edge of the two or more notches in the blowing direction are substantially the same. Preferably, the air guide plate is parallel and extends substantially parallel to the first imaginary line and the second imaginary line. In this way, the size of the notch can be minimized. Therefore, the reduction of the surface area of the radiation fin can be suppressed, and the reduction of the cooling efficiency can be suppressed.

  In the present invention, a cover member fixed to the frame is provided, and the cover member includes a plate-like portion facing the heat dissipating fins in a height direction orthogonal to the extending direction and the arranging direction of the heat dissipating fins, It is preferable that the air guide plate protrudes from the plate-like portion toward the radiation fin. In this case, the plate-like portion of the cover member can suppress the diffusion of the cooling air from the first flow passage. Therefore, the cooling efficiency can be improved. In addition, since the air guide plate can be installed at an appropriate position by attaching the cover member to the frame, the installation of the air guide plate is easy. Furthermore, since it is not necessary to use a fixing member, it is possible to suppress an increase in the number of parts.

  In the present invention, the fan is disposed on one side in the extending direction of the first flow path with respect to the heat dissipation fin, and the notch is on the fan side from the center in the extension direction of the heat dissipation fin Preferably, it is formed in position. Thus, the air can be sent to the second flow path on the side close to the fan, so that the cooling air can be turned by the air guide plate before the cooling air is diffused from the first flow path. Therefore, even if the area of the air guide plate is small, the flow rate of the second flow path can be secured. In addition, before the cooling air is diffused, it can be introduced into the second flow path and sent out to the targeted location.

  In the present invention, the heat dissipating part includes a plate-like heat dissipating fin forming part and a plurality of the heat dissipating fins projecting from the heat dissipating fin forming part, and the side from which the heat dissipating fin protrudes with respect to the heat dissipating fin forming part Preferably, the second heating element is disposed on the opposite side. In this case, the second heat generating body can be efficiently cooled by the heat dissipating fins.

  In the present invention, it is preferable that a regenerative resistor connected to the circuit board is provided, and the regenerative resistor is located on the opposite side to the one side with respect to the heat radiating portion. In this case, since the regenerative resistance is disposed at a position far from the first heating element, heat is less likely to be transmitted between the first heating element and the regenerative resistance. Accordingly, it is possible to suppress the temperature rise of the first heat generating body due to the heat generation of the regenerative resistance and the temperature rise of the regenerative resistance due to the heat generation of the first heat generating body.

In the present invention, the frame includes a back plate opposed to the heat dissipation surface of the heat dissipation fin with a gap, the regenerative resistor is disposed in the gap between the back plate and the heat dissipation surface, and the heat dissipation fin forming portion It is preferable to be disposed with a gap therebetween. In this way, the regenerative resistance can be disposed at a position not interfering with the second flow path, and the heat of the regenerative resistance can be suppressed from being transmitted to the cooling air passing through the second flow path. In addition, it is possible to suppress a decrease in the heat radiation area due to the arrangement of the regenerative resistor, and to suppress a decrease in cooling efficiency. Furthermore, since heat is not easily transmitted between the heat radiation fin forming portion and the regenerative resistance, it is possible to suppress the temperature rise of the second heat generating body due to the heat generation of the regenerative resistance and the temperature rise of the regenerative resistance due to the heat generation of the second heat generating body.

  According to the present invention, the air guide plate is disposed in the notch formed in the heat dissipating fin, and the second flow path intersecting the first flow path for air flow formed between the heat dissipating fins is along the air guide plate. It is formed. By providing such an air guide plate, the air sent into the first flow path is changed in direction by the air guide plate, and flows in the direction intersecting the first flow path, and the arrangement of the heat dissipating fins with respect to the heat dissipation portion It can be sent out to the space located on one side of the direction. Therefore, since a part of the air blown into the first flow passage can be blown toward the parts around the heat dissipation part, it is possible to apply cooling air directly to the parts around the heat dissipation part, thus the heat dissipation It can control that the parts around the part become high temperature. Therefore, while being able to suppress that a product life becomes short by heat, the upper limit of operating environment temperature can be set highly.

It is the perspective view which looked at the motor control device to which the present invention is applied from the diagonal back side. It is a disassembled perspective view of the motor control apparatus of FIG. It is the perspective view which looked at the flame | frame to which the regeneration resistance, the 1st board | substrate, and the 2nd board | substrate were fixed from diagonally front side. It is sectional drawing (AA sectional drawing of FIG. 1) of the motor control apparatus of FIG. It is the perspective view which looked at the 1st cover member from inside. It is explanatory drawing of the attachment structure of the regeneration resistance and fan with respect to a flame | frame. It is a side view of the frame where the regeneration resistance, the 1st substrate, and the 2nd substrate were fixed. It is sectional drawing (BB sectional drawing of FIG. 1) of the motor control apparatus of FIG.

  Hereinafter, an embodiment of a motor control device to which the present invention is applied will be described with reference to the drawings. The motor control device of this embodiment is a servo amplifier used to control a servo motor.

  FIG. 1 is a perspective view of a motor control device 1 to which the present invention is applied as viewed obliquely from the rear, and FIG. 2 is an exploded perspective view of the motor control device 1 of FIG. In the present specification, three directions of XYZ are directions orthogonal to each other. Hereinafter, in the present specification, an example in which the motor control device 1 is installed with the Y direction as the vertical direction will be described, however, the motor control device 1 of the present invention is used in an installation posture with the Y direction as the vertical direction. It is not limited to

  In the present specification, the X direction is the width direction (left-right direction) of the motor control device 1, the Y direction is the vertical direction of the motor control device 1, and the Z direction is the front-rear direction of the motor control device 1. Further, “left” and “right” in the left-right direction are “left” and “right” when the motor control device 1 is viewed from the front side. One side (right side) in the X direction is indicated by + X, the other side (left side) is indicated by -X, one side (upper side) in the Y direction is indicated by + Y, and the other side (lower side) is indicated by -Y, Z One side (front side) of the direction is indicated by + Z, and the other side (back side) is indicated by -Z.

As shown in FIG. 1, the motor control device 1 has a rectangular parallelepiped shape as a whole. The motor control device 1 includes a frame 10 disposed substantially at the center in the width direction X, and a cover member 20 fixed to the frame 10. The cover member 20 includes a first cover member 21 disposed on the right side (+ X direction) of the frame 10, a second cover member 22 disposed on the left side (−X direction) of the frame 10, and a front side (+ Z) of the frame 10. A third cover member 23 disposed in the As shown in FIG. 2, the motor control device 1 includes a first substrate 40 disposed inside the first cover member 21 and a second substrate 50 disposed inside the second cover member 22. The first substrate 40 and the second substrate 50 are fixed to the frame 10.

(flame)
FIG. 3 is a perspective view of the frame 10 to which the regenerative resistor 7, the first substrate 40, and the second substrate 50 are fixed, viewed obliquely from the front side. As shown in FIGS. 2 and 3, the frame 10 is a plate-like frame main body 11 disposed substantially at the center in the width direction X of the motor control device 1 and a rear end of the frame main body 11 (end portion in the −Z direction And a rectangular back plate 12 provided in FIG. The frame body 11 extends forward from the heat dissipating fin forming portion 13 connected to the back plate 12 and the upper end (end portion in the + Y direction) and the lower end (end portion in the −Y direction) of the heat dissipating fin forming portion 13 An upper frame 14 and a lower frame 15 (see FIG. 6) are provided.

  In the frame main body 11, the radiation fin 30 extended in the up-down direction Y is integrally formed. The frame 10 of the present embodiment is formed of a metal having a good thermal conductivity such as aluminum. Therefore, the heat dissipation effect by the heat dissipation fins 30 can be enhanced. Moreover, since aluminum has good processability, the formation of the radiation fin 30 is easy. On the front side (the + Z direction) of the back plate 12, a plurality of the radiation fins 30 are arranged at a substantially constant pitch in the Z direction. The heat dissipating fins 30 project from the heat dissipating fin forming portion 13 of the frame body 11 to the right (in the + X direction). The heat dissipating fins 30 and the heat dissipating fin forming portion 13 constitute a heat dissipating portion 2 for efficiently dissipating the heat generated in the motor control device 1.

  A cooling fan 3 is disposed on the lower side (−Y direction) of the heat radiating portion 2. The frame body 11 is formed with a frame portion 16 (see FIGS. 4 and 6) for attaching the fan 3. The frame portion 16 is provided on the lower side (−Y direction) of the heat dissipation unit 2. The fan 3 sucks in air from the lower side (−Y direction) and blows a cooling air toward the heat dissipation unit 2. In the heat dissipation unit 2, a first flow path 33 is formed between adjacent heat dissipation fins 30. The first flow path 33 extends linearly in the vertical direction Y. The lower end of the first flow path 33 communicates with the side where the fan 3 is disposed. Further, the upper end of the first flow path 33 opens at the upper end surface of the motor control device 1 (see FIG. 1). Accordingly, the cooling air sent from the fan 3 to the heat radiating portion 2 passes through the first flow path 33 and is discharged to the upper side (+ Y direction) of the motor control device 1.

  The first substrate 40 is screwed to bosses 141 and 151 (see FIG. 5) protruding in the + X direction from the upper frame 14 and the lower frame 15, respectively. Similarly, the second substrate 50 is screwed to bosses projecting in the -X direction from the upper frame 14 and the lower frame 15, respectively. FIG. 4 is a cross-sectional view (a cross-sectional perspective view of the position AA of FIG. 1) of the motor control device of FIG. As shown in FIG. 4, the second substrate 50 is in contact with the radiation fin forming portion 13 from the −X direction side, and is screwed to the radiation fin forming portion 13.

  As shown in FIG. 1, in the back plate 12, fixing holes 121 are formed in one of two corner portions at diagonal positions, and a notch 122 is formed in the other. The fixing hole 121 is formed at the corner on the left side (−X direction) of the upper side (+ Y direction) of the back plate 12. The notch 122 is formed at the corner on the right side (+ X direction) of the edge on the lower side (−Y direction) of the back plate 12. By screwing fixing screws in the fixing holes 121 and the notches 122, the back plate 12 can be fixed to the support member at two diagonal positions. Thus, the motor control device 1 can be fixed to the support member via the back plate 12.

(Cover member)
The front surface of the motor control device 1 is constituted by a third cover member 23. A connector (not shown) and a terminal for input and output are provided on the front of the motor control device 1. The third cover member 23 includes a front plate portion 231 provided with an opening for disposing the connector portion and an open / close lid covering the terminal portion, and an upper plate portion 232 connected to the edge of the front plate portion 231 in the + Y direction. Bottom plate portion 233 connected to the edge of the front plate portion 231 in the -Y direction, the front plate portion 231, and the right side plate portion 234 connected to the edge in the + X direction of the front plate portion 231; The left side plate portion 235 connected to the edge in the X direction is provided.

  FIG. 5 is a perspective view of the first cover member 21 as viewed from the inside (−X direction). As shown in FIG. 2 and FIG. 5, the first cover member 21 has a right side plate portion 211 constituting a side surface of the motor control device 1 on the right side (+ X direction) and an upper end edge (an edge of the right side plate portion 211 (+ Y direction edge) And the bottom plate portion 213 (see FIG. 5) connected to the lower end edge (the edge in the −Y direction) of the right side plate portion 211. As shown in FIG. 5, the upper plate portion 212 and the bottom plate portion 213 are provided in a portion from the front end of the first cover member 21 to an intermediate position in the front-rear direction Z. In the right side plate portion 211 of the first cover member 21, the portion on the rear side (−Z direction) from the upper plate portion 212 and the bottom plate portion 213 constitutes a plate-like portion 216 covering the radiation fin 30 from the right side (+ X direction). ing. As shown in FIG. 4, the heat dissipating fins 30 project to a position in contact with the plate-like portion 216. For this reason, the first flow path 33 formed between the heat radiation fins 30 adjacent to each other in the heat radiation portion 2 is closed on the + X direction side by the plate portion 216.

  As shown in FIG. 5, the plate-like portion 216 is formed with a baffle plate 62 projecting toward the side where the heat dissipating fins 30 are disposed (in the −X direction). The baffle plate 62 linearly extends in a direction inclined with respect to the vertical direction Y and the longitudinal direction Z. The function of the baffle plate 62 will be described later.

  As shown in FIG. 2, the second cover member 22 is located on the left side plate portion 221 that constitutes the side surface of the left side (−X direction) of the motor control device 1 and the upper end edge (edge in the + Y direction) of the left side plate portion 221 It has an upper plate portion 222 connected and a bottom plate portion 223 connected to the lower end edge (the edge in the −Y direction) of the left side plate portion 221. In the rear portion of the bottom plate portion 223, an air inlet formation portion 228 which covers the lower side of the fan 3 is formed.

  The top surface (surface in the + Y direction) of the motor control device 1 includes the frame 10, the upper plate portion 212 of the first cover member 21 and the upper plate portion 222 of the second cover member 22, and the upper plate of the third cover member 23. It is constituted by the part 232. Heat dissipation holes 26 are formed in the upper plate portions 212 and 222. The heat radiation holes 26 are long holes long in the width direction X, and are arranged in the front-rear direction Z. The bottom surface of the motor control device 1 is configured by the frame 10, the bottom plate portion 213 of the first cover member 21 and the bottom plate portion 223 of the second cover member 22, and the bottom plate portion 233 of the third cover member 23. The heat dissipation holes 26 are formed in the bottom plate portions 213 and 223 in the same manner as the upper plate portions 212 and 222. The internal space of the motor control device 1 communicates with the outside through the heat dissipation holes 26 formed in the first cover member 21 and the second cover member 22.

  As shown in FIGS. 1 and 2, hooks 19 are formed in the upper frame 14 at three places separated in the Z direction. The upper plate portion 212 of the first cover member 21 is provided with an engagement hole 214 with which the central hook 19 engages. Further, the upper plate portion 222 of the second cover member 22 is provided with engagement holes 214 with which the hooks 19 at the other two places except the hook 19 at the center are engaged. A similar hook mechanism is also formed between the lower frame 15 and the bottom plate (not shown) of the first cover member 21 and the bottom plate 223 of the second cover member 22. The first cover member 21 and the second cover member 22 are fixed to the frame 10 by these hook mechanisms.

In the third cover member 23, the rear side (-Z direction) from the right side plate portion 234 and the left side plate portion 235
The hooks 236 are formed to project. The hook 236 is engaged with an engagement hole 215 formed in the right side plate portion 211 of the first cover member 21 and an engagement hole 225 formed in the left side plate portion 221 of the second cover member 22. The third cover member 23 is fixed to the first cover member 21 and the second cover member 22 by the hook mechanism. The fixing structure of the cover member 20 may be a structure other than the hook mechanism.

  The upper plate portion 222 of the second cover member 22 is formed with a recess 229 having an inclined surface which is inclined downward (in the -Y direction) as it goes back (in the -Z direction). The fixing hole 121 formed in the back plate 12 is disposed inside the recess 229, so a screwing tool is inserted into the recess 229, and the fixing screw inserted in the fixing hole 121 is inserted into the fixing hole 121. It can be screwed from the front side (+ Z direction). Similarly, on the front side (+ Z direction) of the notch 122 of the back plate 12, a recess 32 (see FIG. 6) formed by the end surface of the lower side (-Y direction) of the radiation fin 30 and the side surface of the frame 16. ) Is formed. The recess 32 formed in the heat dissipating fin 30 is continuous with the recess 219 (see FIG. 5) formed in the bottom plate portion 213 of the first cover member 21. Therefore, a screwing tool can be inserted into the recesses 219 and 32, and the fixing screw inserted into the notch 122 of the back plate 12 can be screwed from the front side (+ Z direction) of the back plate 12.

(Heating element)
The first substrate 40 and the second substrate 50 are circuit boards on which electronic components are mounted. The first substrate 40 is a control substrate, and a first command is input based on a control command input from the outside through a connector portion provided to the third cover member 23 and a signal from an encoder mounted on the servomotor. The drive signal is supplied to the two substrates 50. The second substrate 50 is a driver substrate. A circuit pattern constituting a servomotor control circuit for generating U-phase, V-phase and W-phase alternating currents from the power supply current according to the drive signal from the first substrate 40 and supplying the same to the servomotor in the second substrate 50 And electronic components are mounted.

  The motor control device 1 includes a first heating element 5 and a second heating element 6 disposed inside the cover member 20. The first heating element 5 and the second heating element 6 are electronic components that constitute a servomotor control circuit. The servomotor control circuit includes a rectifier circuit that rectifies a power supply current supplied from an AC power supply, a capacitor connected to the rectifier circuit, and an inverter circuit connected to the capacitor. The first heating element 5 is a capacitor and is mounted on the second substrate 50. As shown in FIG. 2, the first substrate 40 disposed on the front side (+ Z direction) of the radiation fin 30 is formed with a notch 41 in which an end portion on the radiation fin 30 side (−Z direction) is cut out. There is. The first heat generating body 5 is disposed on the front side (+ Z direction) of the heat dissipating fin 30 and disposed in the notch 41 of the first substrate 40.

  The second heating element 6 is an IGBT transistor that constitutes an inverter circuit. The second heating element 6 may be an IPM (intelligent power module) in which an inverter circuit is modularized. As shown in FIG. 4, in the heat dissipating fin forming portion 13 of the frame main body 11, the second substrate 50 is in contact with the surface facing the side (−X direction) opposite to the side where the heat dissipating fin 30 protrudes. The second heat generating body 6 is fixed to the portion of the second substrate 50 that abuts on the formation portion 13. The second heat generating body 6 is disposed in the gap between the second substrate 50 and the second cover member 22. The heat generated from the second heat generating body 6 is transmitted to the heat dissipating fin 30 via the heat dissipating fin forming portion 13 and dissipated from the surface of the heat dissipating fin 30. The second heat generator 6 may be fixed to the heat dissipating fin forming portion 13 directly or through an insulator.

The motor control device 1 includes a regenerative resistor 7 connected to a servo motor control circuit mounted on the second substrate 50. The regenerative resistor 7 is a heating element that converts regenerative energy generated at the time of deceleration of the servomotor connected to the servomotor control circuit into heat. In the present embodiment, the regenerative resistor 7 is disposed in the gap between the back plate 12 and the radiation fin 30 and is fixed to the radiation fin 30.

(Mounting structure for regenerative resistor)
FIG. 5 is an explanatory view of a mounting structure of the regenerative resistor and the fan with respect to the frame. As shown in FIG. 5, a plurality of radiation fins 30 are arranged in the front-rear direction Z, and extend in the up-down direction Y. The lower ends (ends in the −Y direction) of the heat radiation fins 30 project from the frame 16 in the + X direction, and are located above the lower ends of the frames 16. The side surface of the frame portion 16 in the + X direction and the lower end surface of each of the heat radiation fins 30 form a recess 32 whose height increases toward the back plate 12. In the plurality of heat dissipating fins 30, a first flow path 33, which is a blowing path extending in the vertical direction Y, is formed between the adjacent heat dissipating fins 30. In the present embodiment, the plate thickness of the plurality of heat dissipating fins 30 is the same, and the width of the first flow path 33 between the adjacent heat dissipating fins 30 is also the same. Each radiation fin 30 is provided with the radiation surface 34 which faces + Z direction and-Z direction.

  Hereinafter, the radiation fin 30 closest to the back plate 12 among the plurality of radiation fins 30 is referred to as a first radiation fin 30A. In the present embodiment, six radiation fins 30 are provided, and the second radiation fins 30B, the third radiation fins 30C, the fourth radiation fins 30D, and the fourth radiation fins 30B are sequentially arranged from the first radiation fins 30A toward the front side (-Z direction). 5 heat radiation fins 30E, sixth heat radiation fins 30F, and seventh heat radiation fins 30G. The first heat dissipating fins 30A are the heat dissipating fins farthest from the first heat generating body 5 mounted on the second substrate 50. Further, the second heat dissipating fins 30B are heat dissipating fins that are the second most distant from the first heat generating body 5.

  The first heat dissipating fins 30 </ b> A are disposed at a position closest to the back plate 12. The first heat radiation fin 30A is formed with a notch 35 which is cut away from the edge in the + X direction toward the -X direction. The regenerative resistor 7 is disposed in the notch 35. When the regenerative resistor 7 is removed, the heat dissipating surface 34 of the second heat dissipating fin 30B located next to the first heat dissipating fin 30A and the back plate 12 face each other with a predetermined gap in the range where the notch 35 is formed. The regenerative resistor 7 is disposed between the heat radiation surface 34 facing the −X direction of the second heat radiation fin 30B and the back plate 12, and is fixed to the heat radiation surface 34 of the second heat radiation fin 30B.

  As shown in FIG. 4, the notch 35 formed in the first heat dissipating fin 30A is formed by cutting out the first heat dissipating fin 30A to an intermediate position in the X direction. Therefore, a gap D in the X direction is formed between the regenerative resistor 7 disposed in the notch 35 and the radiation fin forming portion 13. The second heat generating body 6 is fixed to the heat dissipating fin forming portion 13 via the second substrate 50 on the side opposite to the side on which the heat dissipating fins 30 are formed. That is, the regenerative resistor 7 is disposed so as to form a layer of air between it and the portion (the radiation fin forming portion 13) to which the second heating element 6 is fixed.

  The regenerative resistor 7 is fixed to the heat dissipating surface 34 of the second heat dissipating fin 30 B via the fixing member 8. The fixed members 8 are disposed one by one at both ends of the regenerative resistor 7 in the Y direction. Each fixing member 8 is a bending member provided with a plate-shaped first fixing portion 81 and a plate-shaped second fixing portion 82 connected substantially at right angles to the first fixing portion 81. The first fixing portion 81 abuts on the side surface of the regenerative resistor 7 and is fixed to the regenerative resistor 7. The second fixing portion 82 abuts on the heat dissipating surface 34 and is screwed to the second heat dissipating fin 30 B by the fixing screw 9. As shown in FIG. 5, a fixing hole 83 is formed in the second fixing portion 82, and a screw hole 36 is formed in the second radiation fin 30 </ b> B at a position overlapping the fixing hole 83. In the second radiation fin 30B, the portion where the screw hole 36 is formed is a thick portion 37 whose plate thickness is thicker than the other portions. Through holes 123 are formed in the back plate 12 at positions overlapping with the screw holes 36 of the second heat dissipating fins 30B. The through hole 123 is a hole into which a tool for screwing the fixing screw 9 is inserted.

Wiring notches 39 are formed in the plurality of heat dissipating fins 30 below the mounting position of the regenerative resistor 7 (in the −Y direction). The wiring notch portions 39 formed in the seven heat radiation fins 30 are arranged in the front-rear direction Z, which is the arrangement direction of the heat radiation fins 30, and constitute wiring notch grooves 38 extending in the front-rear direction Z ing. A wire (not shown) connected to the regenerative resistor 7 is disposed in the wiring notch groove 38.

(Cooling structure by the second channel)
A second flow passage 60 is formed in the heat dissipating portion 2 at an intermediate position in the vertical direction Y of the heat dissipating fins 30. The second flow path changes the direction of the cooling air directed upward (in the + Y direction) along the first flow path 33 extending in the vertical direction Y into a direction intersecting the first flow path 33 to form the first flow path 33. Is a flow path for releasing the cooling failure in a different direction. The second flow passage 60 is configured by the notches 61 formed in the plurality of heat dissipating fins 30 and the air guide plate 62 (see FIGS. 5 and 8) disposed in the notches 61.

  FIG. 7 is a side view of the frame 10 to which the regenerative resistor 7, the first substrate 40, and the second substrate 50 are fixed. 8 is a cross-sectional view of the motor control device 1 of FIG. 1 (B-B cross-sectional view of FIG. 1) and shows the cross-sectional configuration of the heat dissipation portion 2 at the position where the air guide plate 62 and the notch 61 are provided . As shown in FIG. 5, the air guide plate 62 protrudes from the plate-like portion 216 of the first cover member 21 toward the radiation fin 30. When the first cover member 21 is attached to the frame 10, the air guide plate 62 is disposed in the notch 61, as shown in FIG. Thus, a second flow passage 60 in which the cooling air flows along the air guide plate 62 is formed inside the notch 61. The second flow passage 60 is configured to send the cooling air toward the first heating element 5 positioned on the front side (+ Z direction) with respect to the heat dissipation part 2. The side (+ Z direction) where the first heat generating body 5 is located with respect to the heat radiating portion 2 is one side in the front-rear direction Z which is the arrangement direction of the heat radiating fins 30 in the heat radiating portion 2.

  As shown in FIGS. 3 and 7, among the plurality of heat dissipating fins 30, the fifth heat dissipating fins 30G from the seventh heat dissipating fin 30G to the third heat dissipating fin 30C located on the most front side (+ Z direction) Notches 61 for forming the two flow paths 60 are formed at one place. The five notches 61 are arranged obliquely in the direction toward the upper side (+ Y direction) as the first heat generating body 5 is disposed on the side (i.e., the + Z direction). In the first flow path 33, the cooling air supplied from the fan 3 flows upward (in the + Y direction). That is, the arrangement direction of the five notches 61 is the downstream direction (+ Y direction) of the blowing direction by the fan 3 as it goes to the side (+ Z direction) in which the first heat generating body 5 is disposed.

  The five notches 61 have the same shape, and are notched at the same height (the same depth) in the −X direction from the tip of the radiation fin 30. Further, the five notches 61 have the same notch width in the vertical direction Y, and are offset in the vertical direction Y and arranged. As shown in FIG. 3, the depth of the notch 61 in the −X direction is smaller than the protruding height of the radiation fin 30 in the + X direction. That is, the notch 61 is formed by notching a part of the tip end side, not all of the height direction of the radiation fin 30. Therefore, the air guide plate 62 shields part of the cooling air in a part in the height direction (X direction) of the first flow path 33 and changes its direction. However, the bottom portion of the first flow path 33 A flow passage space in which the cooling air flows in the vertical direction Y is left in the region on the base end side of the

  As shown in FIG. 7, the five notches 61 are linearly arranged in a direction inclined with respect to the vertical direction Y and the longitudinal direction Z. A first imaginary line LA connecting the edge on the downstream side (that is, the + Y direction) of each notch 61 and a second imaginary line LB connecting the edge on the upstream side (that is, the −Y direction) of each notch 61 are parallel And inclined with respect to the vertical direction Y and the longitudinal direction Z. As shown in FIG. 8, the baffle plate 62 is disposed in parallel to the first imaginary line LA and the second imaginary line LB. The air guide plate 62 is disposed near the edge on the downstream side (+ Y direction) of each notch 61, and a gap is formed between the edge on the upstream side (−Y direction). Thereby, the second flow passage 60 for flowing the cooling air along the air guide plate 62 is formed on the upstream side (−Y direction) of the air guide plate 62.

  Since the second flow passage 60 is inclined in the direction toward the downstream side (+ Y direction) in the blowing direction as it goes to the front side (+ Z direction), the cooling air flowing through the second flow passage 60 is the front side of the heat dissipation portion 2 It is emitted toward the upper (+ Y direction) region of the space S in the (+ Z direction). Of the notches 61 constituting the second flow passage 60, the notches 61 formed in the seventh radiation fin 30G located on the frontmost side (+ Z direction) serve as the cooling air discharge port of the second flow passage 60. And faces the space S on the front side (+ Z direction) of the heat radiating portion 2. The space S on the front side of the heat dissipation portion 2 is a space on one side of the arrangement direction of the heat dissipation fins 30, and is a space in which the first heat generating body 5 is disposed. That is, the second flow passage 60 includes a cooling air discharge port in communication with the space in which the first heat generating body 5 is disposed. The cooling air discharge port (the notch 61 formed in the seventh heat dissipating fin 30G) opens at a position lower than the first heating element 5 (in the −Y direction). Therefore, the cooling air discharged from the second flow passage 60 is discharged toward the first heating element 5 from the obliquely lower side of the first heating element 5.

  The fan 3 for blowing the cooling air to the heat radiating portion 2 is disposed on the lower side (−Y direction) of the heat radiation fin 30. In the present embodiment, the second flow path 60 is formed below the center of the first flow path 33 in the vertical direction Y (−Y direction). That is, the second flow passage 60 is formed on the first flow passage 33 on the upstream side in the blowing direction of the cooling air, that is, on the fan 3 side. Therefore, the notch 61 forming the second flow passage 60 is formed at a position closer to the fan 3 (i.e., the -Y direction) than the center of the radiation fin 30 in the vertical direction Y. In this embodiment, the five notches 61 are arranged in a direction inclined with respect to the vertical direction Y and the longitudinal direction Z, but all of them are below the center of the vertical direction Y of the radiation fin 30 (−Y Direction). Therefore, the second flow passage 60 can change the direction of the cooling air on the upstream side of the first flow passage 33 and send it out to the space S on the front side of the heat dissipation unit 2.

(Main effects of this form)
As described above, in the motor control device 1 of the present embodiment, the heat dissipation unit 2 is formed in the frame 10, and the heat dissipation unit 2 is formed between the adjacent heat dissipation fins 30 and extends in the vertical direction Y A first flow path 33 and a second flow path 60 intersecting the first flow path 33 are provided. The second flow passage 60 is a flow passage along the air guide plate 62 which is disposed in the notch 61 formed in the radiation fin 30 and extends in a direction intersecting the first flow passage 33. These communicate with the space S located on one side (+ Z direction) of the heat radiation portion 2 in the arrangement direction (Z direction) of the heat radiation fins 30. By providing such an air guide plate 62, the cooling air sent into the first flow path 33 is diverted by the air guide plate 62 and is made to flow in the direction intersecting the first flow path 33 to the heat dissipation unit 2. In contrast, it can be sent out to the space S located on one side (+ Z direction) of the radiation fins 30 in the arrangement direction (Z direction). Therefore, since a part of the cooling air blown into the first flow path 33 can be blown towards the parts around the heat dissipation part 2, the parts around the heat dissipation part 2 are directly hit with the cooling air to be cooled be able to. Therefore, it can suppress that the components around the thermal radiation part 2 become high temperature. As a result, shortening of the product life of the motor control device 1 due to heat can be suppressed, and the upper limit of the use environment temperature of the motor control device 1 can be set high.

  In this embodiment, since the first heating element 5 mounted on the second substrate 50 is disposed in the space S where the cooling air is discharged from the second flow passage 60, the cooling air is directed toward the first heating element 5 The air can be blown to directly cool the first heating element 5. Therefore, it can suppress that the 1st heat generating body 5 becomes high temperature. Further, since the amount of heat accumulated in the frame 10 can be reduced by directly lowering the temperature of the first heat generating body 5 as described above, the temperature of the entire motor control device 1 can be lowered.

In the present embodiment, the notch 61 that constitutes the second flow passage 60 is formed by cutting out a part of the radiation fin 30 in the height direction (X direction). Therefore, since the air guide plate 62 is disposed only in a part of the first flow path 33 in the height direction (X direction), a flow passage space not blocked by the wind guide plate 62 remains in the first flow path 33. The cooling air is blown to the upper side of the air guide plate 62. Therefore, the radiation fin 3
The reduction of the cooling efficiency due to 0 can be suppressed. Further, since the cooling air flowing through the first flow passage 33 flows through the bottom of the first flow passage 33, the cooling air can be suppressed from diffusing from the first flow passage 33. Therefore, the reduction of the cooling efficiency can be suppressed and the cooling can be performed efficiently. Further, by adjusting the depth of the notches 61 and the height of the air guide plate 62, it is possible to adjust the flow rate of the cooling air in the first flow passage 33 and the second flow passage 60.

  In the present embodiment, the notches 61 are formed in the five heat dissipating fins 30 including the seventh heat dissipating fin 30G positioned on the frontmost side (+ Z direction) of the plurality of heat dissipating fins 30, and the range of the five heat dissipating fins 30 is The second flow passage 60 is formed in the In such a configuration, five notches 61 for forming a space for arranging the air guide plate 62 are arranged diagonally in the flow channel direction of the second flow channel 60, so that It is configured not to increase the size unnecessarily. Therefore, the reduction of the surface area of the radiation fin 30 can be suppressed, and the reduction of the cooling efficiency can be suppressed. In particular, in this embodiment, a first virtual line LA connecting the downstream side (+ Y direction) edges of the five notches 61 and a second virtual line LA connecting the upstream side (-Y direction) of the five notches 61 A configuration is employed in which the virtual line LB is substantially parallel and the air guide plate 62 extends substantially parallel to the first virtual line LA and the second virtual line LB. Therefore, since the width of the notch 61 in the X direction can be minimized, the reduction of the surface area of the heat dissipating fin can be suppressed, and the reduction of the cooling efficiency can be suppressed.

  In the present embodiment, the first cover member 21 fixed to the frame 10 includes a plate-like portion 216 that covers the heat dissipation portion 2. The plate-like portion 216 faces the heat dissipating fins 30 in a height direction (X direction) orthogonal to the extending direction (Y direction) of the heat dissipating fins 30 and the arrangement direction (Z direction). The plate-like portion 216 abuts on the tip of the heat radiation fin 30, so that the cooling air can be prevented from diffusing from the first flow path 33. Therefore, the cooling efficiency can be improved. In addition, you may employ | adopt the structure which has a clearance gap between the plate-like-part 216 and the front-end | tip of the radiation fin 30. FIG. Further, the air guide plate 62 constituting the second flow passage 60 is integrally formed with the first cover member 21 and protrudes from the plate-like portion 216 to the side of the radiation fin 30. Therefore, by attaching the first cover member 21 to the frame 10, the air guide plate 62 can be installed at an appropriate position in the notch 61 of the heat dissipating fin 30, so installation of the air guide plate 62 is easy. Moreover, since it is not necessary to separately use a fixing member as in the case where the air guide plate 62 is a separate member, an increase in the number of parts can be suppressed.

  In this embodiment, in order to provide the second flow passage 60 at a position on the fan 3 side in the first flow passage 33, the notch 61 is formed on the lower side (−Y direction) from the center of the heat dissipation fin 30 in the vertical direction Y. There is. Thus, by providing the second flow passage 60 on the side close to the fan 3, the cooling air can be turned by the air guide plate 62 before the cooling air is diffused from the first flow passage 33. Therefore, even if the area of the air guide plate is small, the flow rate of the second flow passage 60 can be secured. In addition, before the cooling air is diffused, it can be introduced into the second flow passage 60 and sent out to the target location.

  The heat dissipating portion 2 of the present embodiment includes a plate-like heat dissipating fin forming portion 13 and a plurality of heat dissipating fins 30 projecting from the heat dissipating fin forming portion 13, and the heat dissipating fin 30 protrudes relative to the heat dissipating fin forming portion 13. The second heating element 6 is disposed on the side (−X direction) opposite to the side. Therefore, the heat of the second heat generating body 6 can be dissipated efficiently by the heat dissipating fins 30, so that the second heat generating body 6 can be efficiently cooled.

  In the present embodiment, the regenerative resistor 7 connected to the second substrate 50 is provided, and the regenerative resistor 7 is on the side (−Z direction) opposite to the side (+ Z direction) where the first heat generating body 5 is disposed with respect to the heat radiating portion 2 Orientation). As described above, by arranging the regenerative resistor 7 as the heating element at a position far from the first heating element 5, heat is less likely to be transmitted between the first heating element 5 and the regenerative resistance 7. Therefore, it is possible to suppress the temperature rise of the first heat generating body 5 due to the heat generation of the regenerative resistance 7 and the temperature rise of the regenerative resistance 7 due to the heat generation of the first heat generating body 5.

  In the present embodiment, the back plate 12 is formed on the frame 10 in which the heat radiation portion 2 is integrally formed. The regenerative resistor 7 is disposed in the gap between the back plate 12 and the radiation fin 30. Therefore, since the regenerative resistor 7 can be disposed so as not to interfere with the second flow passage 60, the heat of the regenerative resistor 7 is not easily transmitted to the cooling air introduced to the second flow passage 60. Therefore, it is possible to suppress a decrease in the cooling efficiency due to the cooling air discharged from the second flow passage 60. Further, since the gap D is provided between the heat dissipating fin forming portion 13 and the regenerative resistor 7, the regenerative resistance due to the temperature rise of the second heat generating body 6 due to the heat generation of the regenerative resistance 7 and the heat generation of the second heat generating body 6 The temperature rise of 7 can be suppressed.

  Further, in the arrangement of the regenerative resistor 7 as in this embodiment, the size of the motor control device 1 in the width direction (X direction) is increased compared to the case where the regenerative resistor 7 is arranged on the tip end side of the radiation fin 30. It can be suppressed. Further, as compared with the case where the plurality of heat dissipating fins 30 are cut out and the regenerative resistor 7 is disposed so as to be in contact with the tip of the heat dissipating fins 30, the surface area of the heat dissipating fins 30 is less reduced. . Furthermore, compared with the case where the back plate is cut out and the regenerative resistance is disposed, the reduction in the strength of the frame 10 can be suppressed. In addition, although the regenerative resistor 7 may be fixed to either the radiation fin 30 or the back plate 12, in the present embodiment, the regenerative resistor 7 is fixed to the side of the radiation fin 30. In this case, the regenerative resistor 7 can be attached and detached from the back plate 12 side. That is, the through holes 123 can be formed in the back plate 12, and the regenerative resistor 7 can be attached and detached from the outside of the back plate 12. As a result, the workability at the time of attaching and detaching the regenerative resistor 7 can be improved, and the maintainability can be improved.

  The regenerative resistor 7 of the present embodiment is fixed to the heat dissipating surface 34 of the second heat dissipating fin 30 B via the fixing member 8. The fixing member 8 includes a first fixing portion 81 in contact with the regenerative resistor 7 and a second fixing portion 82 in contact with the heat dissipation surface. Therefore, since the transmission path via the fixing member 8 is added as a path for transmitting the heat of the regenerative resistor 7 to the second radiation fin 30B, the cooling efficiency of the regenerative resistor 7 can be improved. The shape of the fixing member 8 is not limited to that of the present embodiment. For example, it can also be fixed using a fixing member that covers the entire regenerative resistor 7. In addition, without using the fixing member 8, a fixing hole can be provided in the regenerative resistor 7 and fixed. Alternatively, the regenerative resistor 7 can be fixed to the heat dissipation surface 34 using an adhesive.

  In the present embodiment, the wiring notch portions 39 are formed in the plurality of heat radiation fins 30, and the wiring notch grooves 38 extending in the front-rear direction Z, which is the arrangement direction of the heat radiation fins 30, are provided. Therefore, the wiring connecting the second substrate 50 and the regenerative resistor 7 can be accommodated and routed in the wiring notch groove 38. As a result, since the wiring is not drawn around the outside of the frame 10, disconnection of the wiring connecting the second substrate 50 and the regenerative resistor 7 can be suppressed.

(Other embodiments)
(1) The air guide plate 62 may not be formed on the first cover member 21 but may be formed on the heat dissipating fins 30. For example, with respect to each of the five notches 61 formed in the heat dissipating fins 30, the edges of the respective notches 61 on the downstream side (the + Y direction) are connected at the same angle as the air guide plate 62. A windplate can be provided.

(2) The baffle plate 62 may be a member different from the first cover member 21 and the frame 10.

(3) In the above embodiment, the five notches 61 are arranged at the same angle as the direction of the air guide plate 62, but the arrangement and size of the notches 61 are not limited to such an embodiment.

(4) In the above embodiment, the first heat generating body 5 is a capacitor, the second heat generating body 6 is an IGBT transistor, and a regenerative resistor 7 is provided separately from these two heat generating bodies. It is not limited to such a combination. In addition, the regenerative resistor 7 at the position of the second heating element 6
May be arranged.

DESCRIPTION OF SYMBOLS 1 ... Motor control apparatus, 2 ... Heat dissipation part, 3 ... Fan, 5 ... 1st heat generating body, 6 ... 2nd heat generating body, 7 ... Regeneration resistance, 8 ... Fixing member, 9 ... Fixing screw, 10 ... Frame, 11 ... Frame body 12 Rear plate 13 Heat radiation fin forming portion 14 Upper frame 15 Lower frame 16 Frame portion 19 Hook 19 Cover member 21 First cover member 22 Second Cover member 23 third cover member 26 heat radiation hole 30 heat radiation fin 30A first radiation fin 30B second radiation fin 30C third radiation fin 30D fourth radiation fin 30E Fifth radiation fin, 30F: sixth radiation fin, 30G: seventh radiation fin, 32: recess, 33: first flow passage, 34: radiation surface, 35: notch, 36: screw hole, 37: thick portion , 38: notch for wiring, 39: notch for wiring, DESCRIPTION OF SYMBOLS 0 ... 1st board | substrate, 41 ... notch, 50 ... 2nd board | substrate, 60 ... 2nd flow path, 61 ... notch, 62 ... baffle plate, 81 ... 1st fixing | fixed part, 82 ... 2nd fixing | fixed part, 83 ... fixed hole 121 fixed hole 122 notched 123 through hole 141, 151 boss portion 211 right side plate portion 212 upper plate portion 213 bottom plate portion 214, 215 engagement hole , 216: plate-like portion, 219: concave portion, 221: left side plate portion, 222: upper plate portion, 223: bottom plate portion, 224, 225: engagement hole, 228: intake port forming portion, 229: concave portion, 231: front Plate portion 232 Upper plate portion 233 Bottom plate portion 234 Right side plate portion 235 Left plate portion 236 Hook D gap LA first virtual line LB second virtual line S Space X on the front side of the heat radiation portion: width direction Y: up and down direction Z: front and back direction

Claims (10)

A motor control device comprising: a circuit board provided with a motor control circuit; a frame provided with a heat dissipating unit in which a plurality of heat dissipating fins are arranged; and a fan for blowing air toward the heat dissipating fins,
The heat dissipation unit includes a first flow path formed between adjacent heat dissipation fins, and a second flow path intersecting the first flow path.
The second flow path is a flow path which is disposed in a notch formed in the heat dissipating fin or is connected to an edge of the notch and extends along a baffle plate extending in a direction intersecting the first flow path. A motor control device characterized in that it communicates with a space located on one side in the arrangement direction of the heat dissipation fins with respect to the heat dissipation portion. A first heating element mounted on the circuit board;
The motor control device according to claim 1, wherein the second flow path communicates with the heat radiation portion on the side where the first heat generating body is positioned.   The motor control device according to claim 1, wherein the notch is formed by notching a part in the height direction of the heat dissipating fin. The notches are formed in two or more of the heat dissipating fins including the heat dissipating fin located closest to the one side among the plurality of heat dissipating fins,
The two or more notches are arranged in the downstream direction of the blowing direction by the fan as it goes to the one side,
4. The air guide plate according to claim 1, wherein the air guide plate extends obliquely in a direction toward the downstream side toward the one side in a range in which the two or more notches are arranged. The motor control device according to any one of the preceding claims. A first imaginary line connecting the downstream edges of the two or more notches and a second imaginary line connecting the upstream edge of the two or more notches in the blowing direction are substantially parallel.
The motor control device according to claim 4, wherein the air guide plate extends substantially in parallel with the first virtual line and the second virtual line. A cover member fixed to the frame;
The cover member includes a plate-like portion facing the heat dissipating fins in a height direction orthogonal to the extending direction and the arranging direction of the heat dissipating fins,
The motor control device according to any one of claims 1 to 5, wherein the air guide plate protrudes from the plate portion toward the heat radiation fin. The fan is disposed on one side in the extending direction of the first flow path with respect to the radiation fin,
The motor control device according to any one of claims 1 to 6, wherein the notch is formed at a position closer to the fan than a center of the radiation fin in the extending direction. The heat dissipating unit includes a plate-like heat dissipating fin forming portion and a plurality of the heat dissipating fins projecting from the heat dissipating fin forming portion.
The motor control device according to any one of claims 1 to 7, wherein a second heat generating body is disposed on the side of the heat dissipating fin forming portion opposite to the side where the heat dissipating fin protrudes. . A regenerative resistor connected to the circuit board,
The motor control device according to claim 8, wherein the regenerative resistance is located on the opposite side to the one side with respect to the heat dissipation unit. The frame includes a back plate that faces the heat dissipating surface of the heat dissipating fin with a gap.
10. The motor control device according to claim 9, wherein the regenerative resistor is disposed in a gap between the back plate and the heat dissipating surface, and is disposed with a gap between the heat dissipating fin forming portion.

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