Control device

Abstract

To provide a control device capable of improving heat dissipation of a capacitor and improving efficiency of fixing work of the capacitor to a capacitor mounting wall.SOLUTION: A control device includes a capacitor 12, a case 10, an insulating member, and a heat conductive adhesive 38 having high heat conductivity. The case 10 has a capacitor mounting wall 32 with high thermal conductivity, and houses the capacitor 12 inside in a state where the capacitor 12 is mounted on the capacitor mounting wall 32. The insulating member is interposed between the capacitor mounting wall 32 and a part of the capacitor 12. The thermally conductive adhesive 38 is interposed in a region between the capacitor placement wall 32 and the capacitor 12 where the insulating member is not disposed.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a control device in which a capacitor is housed in a case. [Background technology]

[0002] A known motor drive control device converts DC power supplied from a battery into AC power and drives the motor with the converted AC power. This type of control device houses a circuit board with electronic components mounted and a capacitor for current smoothing within a case. The capacitor used here is typically an aluminum electrolytic capacitor, but this type of capacitor is prone to heat generation due to the ripple current generated. Therefore, efficient heat dissipation is desirable to prevent capacitor degradation due to heat. For this reason, in this type of control device, the capacitor mounting wall of the case may be formed from a metal with high heat dissipation properties (for example, aluminum), and the capacitor may be mounted on the capacitor mounting wall.

[0003] However, although the outer surface of the capacitor is coated, the insulation provided by the coating is often insufficient. To address this issue, a method has been proposed in which an insulating member is placed between the capacitor mounting wall and the capacitor (see, for example, Patent Document 1).

[0004] In the technology described in Patent Document 1, insulating paper is placed on the upper surface of a metal capacitor mounting wall, and a capacitor is mounted on the insulating paper. In this state, the capacitor is resin-molded inside the case. With this technology, heat from the capacitor is dissipated to the outside through the insulating paper and the metal capacitor mounting wall, and the capacitor and the capacitor mounting wall are electrically insulated by the insulating paper. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2018 / 128005 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the technology described in Patent Document 1, insulating paper is placed over the entire area of ​​the capacitor mounting wall where the capacitors are mounted, which tends to significantly hinder heat transfer from the capacitors to the metal capacitor mounting wall. For this reason, further improvement in the heat dissipation of the capacitors through the capacitor mounting wall is desired.

[0007] Furthermore, in the technology described in Patent Document 1, the capacitor and insulating paper are fixed to the capacitor mounting wall by the molding resin filled in the case, which makes the process of fixing the capacitor to the capacitor mounting wall quite complex, and further improvements are desired in terms of production efficiency.

[0008] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a control device that can improve the heat dissipation of a capacitor and increase the efficiency of the process of fixing the capacitor to a capacitor mounting wall. [Means for solving the problem]

[0009] In order to solve the above problems, a control device according to one aspect of the present invention employs the following configuration. That is, a control device according to one aspect of the present invention is characterized by comprising a capacitor, a case having a capacitor mounting wall with high thermal conductivity and accommodating the capacitor inside with the capacitor mounted on the capacitor mounting wall, an insulating member interposed between the capacitor mounting wall and a portion of the capacitor, and a thermally conductive adhesive with high thermal conductivity interposed in an area between the capacitor mounting wall and the capacitor where the insulating member is not located.

[0010] With the above configuration, the capacitor and the capacitor mounting wall are electrically insulated by the insulating member. The capacitor is fixed to the capacitor mounting wall by a thermally conductive adhesive applied to an area between the capacitor and the capacitor where no insulating member is placed. When fixing the capacitor, if the thermally conductive adhesive is applied to the area of ​​the capacitor mounting wall where no insulating member is placed, the capacitor fixing process can be completed by simply placing the capacitor on the insulating member and waiting for the adhesive to harden. Furthermore, the thickness of the thermally conductive adhesive interposed between the capacitor and the capacitor mounting wall can be made approximately constant by the insulating member. Furthermore, heat generated by the capacitors during use of the control device is transferred to the capacitor mounting wall through the thermally conductive adhesive, which has high thermal conductivity, and as a result, the heat from the capacitors is efficiently dissipated to the outside.

[0011] It is desirable that a plurality of insulating members be arranged so as to support the capacitor at a plurality of locations spaced apart in the extending direction of the capacitor.

[0012] In this case, the capacitor is supported by a plurality of insulating members arranged at a distance from each other, allowing the capacitor to be maintained in a stable position while waiting for the thermally conductive adhesive to harden. This configuration also facilitates maintaining a constant gap between the capacitor and the capacitor mounting wall, through which the thermally conductive adhesive is applied. Therefore, this configuration facilitates the process of fixing the capacitor with the thermally conductive adhesive and makes it easier to achieve a uniform thickness of the thermally conductive adhesive.

[0013] The capacitors may be cylindrical capacitors, and multiple capacitors may be arranged in parallel in a direction intersecting the axial direction of the capacitors. The insulating member may be arranged at a position spanning one axial end side of each of the multiple capacitors and at a position spanning the other axial end side of each of the multiple capacitors. The thermally conductive adhesive may be arranged between the capacitor mounting wall and each of the capacitors in a region between the insulating member arranged at the position spanning the one end side and the insulating member arranged at the position spanning the other end side.

[0014] In this case, one axial end and the other axial end of each of the capacitors are supported by a corresponding insulating member. This allows the capacitors to be stably supported by two insulating members, one at the front and one at the back, in the axial direction while remaining electrically insulated. Furthermore, the parallel-arranged capacitors are stably bonded and fixed to the capacitor mounting wall in the region between the two insulating members with a thermally conductive adhesive.

[0015] The insulating member is preferably insulating paper.

[0016] In this case, the easy-to-handle insulating paper can electrically insulate the capacitor from the capacitor mounting wall, and because the insulating paper is thin, the capacitor can be placed closer to the capacitor mounting wall, further improving the heat dissipation of the capacitor.

[0017] The insulating member arranged at a position spanning one end side and the insulating member arranged at a position spanning the other end side may be formed into a congruent trapezoidal shape, and a positioning portion may be arranged at the position where the two insulating members are placed on the capacitor mounting wall, into which the corners of each insulating member engage.

[0018] In this case, by engaging the corners of the two insulating members with the positioning portions on the capacitor mounting wall, the two insulating members can be installed in specified positions on the capacitor mounting wall. Furthermore, because the two insulating members have a congruent trapezoidal shape, insulating members with the same specifications can be used in two locations. [Effects of the Invention]

[0019] The control device described above ensures insulation of the capacitors by using an insulating member disposed between the capacitors and the capacitor mounting wall, and also secures the capacitors to the capacitor mounting wall and provides good heat transfer by using a thermally conductive adhesive disposed between the capacitors and the capacitor mounting wall. Therefore, the control device described above can improve the heat dissipation of the capacitors and increase the efficiency of the process of securing the capacitors to the capacitor mounting wall. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 2 is a perspective view of a control device according to the embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the control device according to the embodiment. [Figure 3] FIG. 2 is a perspective view of the control device according to the embodiment with some components removed. [Figure 4] FIG. 2 is a plan view of the control device according to the embodiment with some components removed. [Figure 5] 5 is a cross-sectional view of the control device according to the embodiment taken along line VV in FIG. 4. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0022] Fig. 1 is a perspective view of a control device 1 of this embodiment, and Fig. 2 is an exploded perspective view of the control device 1. Fig. 3 is a perspective view of the control device 1 with some components removed. The control device 1 has an inverter function that converts DC power supplied from a battery (not shown) into AC power and drives a motor (not shown) (AC motor) with the converted AC power. As shown in FIG. 2, the control device 1 has a thin, rectangular parallelepiped case 10 with one open side. A plurality of fins 10a for heat dissipation protrude from the outer surface of the case 10. An opening 10b of the case 10 is closed by a cover 31, as shown in FIG. 1. The cover 31 is detachably attached to the case 10 with a plurality of screws 50. In the following description, for convenience of explanation, the side of the case 10 where the opening 10b is located will be referred to as the "upper" side, and the opposite side will be referred to as the "lower" side.

[0023] <Overall configuration of the control device> The case 10 includes a base member 10A made of aluminum alloy (metal) formed by aluminum die-casting or the like, and a resin case body 10B fixed to the top of the base member 10A. The base member 10A is formed in a substantially rectangular shape when viewed from above. A first substrate 11, a plurality of capacitors 12 (see FIG. 3), and the like, which will be described in detail later, are attached to the top surface of the base member 10A. A plurality of fins 10a for heat dissipation are formed on the bottom surface of the base member 10A.

[0024] The case body 10B includes a main body block portion 10Ba having a rectangular frame shape when viewed from above, and a bus bar support portion 10Bb connected to one side of the main body block portion 10Ba. The main body block portion 10Ba has the opening 10b that opens upward. The first substrate 11 and the plurality of capacitors 12 attached to the upper surface of the base member 10A are surrounded by a peripheral wall of the main body block portion 10Ba. One end of each of the plurality of bus bars (battery-side bus bars 17A, 17B and motor-side bus bars 18A, 18B, 18C) is supported by the bus bar support portion 10Bb. FIG. 3 shows a state in which the case body 10B and the cover 31 have been removed together with the second substrate 14, which will be described later.

[0025] As shown in Fig. 3, a plurality of support pillars 13A, 13B, and 13C are provided on the upper surface of base member 10A, protruding upward. As shown in Fig. 2, a second substrate 14 is supported on the upper portions of the plurality of support pillars 13A, 13B, and 13C. Second substrate 14 is disposed above first substrate 11 and the plurality of capacitors 12 so as to be substantially parallel to first substrate 11. As shown in Fig. 3, first substrate 11 is disposed near one side of the upper surface of base member 10A, which has a substantially rectangular shape when viewed from above, and the plurality of capacitors 12 are disposed near the other side of the upper surface of base member 10A.

[0026] The first substrate 11 is a printed circuit board (PWB) on which a plurality of electronic components including switching elements 15 are mounted. A plurality of switching elements 15 are combined together to form the main part of a power control circuit 16 together with the capacitor 12. The power control circuit 16 performs ON / OFF operation by controlling the switching elements 15 using a control unit (not shown), thereby converting the DC power of the battery into three-phase AC power.

[0027] A pair of battery-side bus bars 17A, 17B, which are electrodes for supplying current to the battery, and three motor-side bus bars 18A, 18B, 18C, which are electrodes for supplying current to the motor, are connected to the power control circuit 16. The pair of battery-side bus bars 17A, 17B can be connected to the positive and negative poles of the battery via connection cables (not shown). The three motor-side bus bars 18A, 18B, 18C can be connected to the U-phase, V-phase, and W-phase power supply parts of the motor via connection cables (not shown).

[0028] As shown in Fig. 3, capacitor 12 arranged near the other side of base member 10A is formed in a substantially cylindrical shape. These multiple capacitors 12 are arranged in parallel in a direction perpendicular to the longitudinal direction (axial direction). The multiple capacitors 12 are connected to the circuit on first substrate 11 via connection bus bars 19A, 19B that are surface-mounted on first substrate 11. Capacitor 12 is formed, for example, from an aluminum electrolytic capacitor. The specific structure of the mounting portion of capacitor 12 on base member 10A will be described in detail later.

[0029] Hereinafter, the direction along the longitudinal direction (axial direction) of capacitor 12 will be referred to as the X direction. The direction in which capacitors 12 are arranged in parallel will be referred to as the Y direction, and the direction perpendicular to the X and Y directions will be referred to as the Z direction. Arrows indicating the X direction, Y direction, and Z direction are shown at appropriate positions in the drawings.

[0030] Positive and negative circuit terminals (not shown), which are power input sections from a battery, are mounted on the top surface of first substrate 11. These circuit terminals are arranged near both ends in the Y direction of first substrate 11. Battery-side bus bars 17A and 17B, which are electrodes for supplying current, are connected to the positive and negative circuit terminals on first substrate 11, respectively.

[0031] Each of the battery-side busbars 17A and 17B is formed from a long, conductive metal plate. One longitudinal end of each of the battery-side busbars 17A and 17B is a terminal fixing portion 17Aa or 17Ba attached to the upper surface of one end of the case 10 in the X direction, and the other longitudinal end is a circuit fixing portion 17Ab or 17Bb connected to the positive circuit terminal and the negative circuit terminal on the first circuit board 11. The terminal fixing portions 17Aa or 17Ba and the circuit fixing portions 17Ab or 17Bb of the battery-side busbars 17A and 17B are fixed to the busbar support portion 10Bb and the first circuit board 11, respectively, so that the longitudinal direction of each of the battery-side busbars 17A and 17B is aligned with the X direction. A portion of each of the battery-side busbars 17A and 17B penetrates and is embedded in the peripheral wall of the main body block portion 10Ba.

[0032] Furthermore, three output circuit terminals (not shown) for the U phase, V phase, and W phase, which are power output sections to the motor, are mounted on the upper surface of first substrate 11. These output circuit terminals are arranged in the central region in the Y direction of first substrate 11, spaced apart approximately evenly in the Y direction. Motor side bus bars 18A, 18B, and 18C, which are current-carrying electrodes, are connected to each of these output circuit terminals.

[0033] Like the battery-side busbars 17A and 17B, the motor-side busbars 18A, 18B, and 18C are formed from long, plate-like conductive metal plates. One longitudinal end of each of the motor-side busbars 18A, 18B, and 18C is a terminal fixing portion 18Aa, 18Ba, or 18Ca attached to the upper surface of one end of the case 10 in the X direction, and the other longitudinal end is a circuit fixing portion 18Ab, 18Bb, or 18Cb connected to the output-side circuit terminals on the first circuit board 11. The terminal fixing portions 18Aa, 18Ba, or 18Ca and the circuit fixing portions 18Ab, 18Bb, or 18Cb of each of the motor-side busbars 18A, 18B, and 18C are fixed to the busbar support portion 10Bb and the first circuit board 11, respectively, so that the longitudinal direction of each of the motor-side busbars 18A, 18B, and 18C is aligned with the X direction. A portion of each of motor-side bus bars 18A, 18B, 18C penetrates the peripheral wall of main body block portion 10Ba and is embedded in the peripheral wall, similar to terminal fixing portions 17Aa, 17Ba.

[0034] The second substrate 14 is a printed circuit board (PWB) on which electronic components are mounted. The circuit printed on the second substrate 14 is connected to the circuit on the first substrate 11 via an inter-board connector 21 (see FIG. 3). A signal connector 22 is coupled to the other end of the second substrate 14 in the X direction. The signal connector 22 is sandwiched between the case body 10B and the cover 31 from above and below, and is fixed to the case body 10B and the cover 31 in this state. A plurality of signal terminals protruding from the signal connector 22 are also connected to the circuit on the second substrate 14.

[0035] <Capacitor mounting area> Fig. 4 is a plan view of the control device 1 with some components removed. As with Fig. 3, Fig. 4 shows the state in which the case body 10B and the cover 31 have been removed together with the second substrate 14. Also, in Fig. 4, some of the capacitors 12 mounted on the base member 10A are shown by virtual lines. Fig. 5 is a cross-sectional view taken along line VV in Fig. 4. As shown in Fig. 4, an accommodating recess 40 is formed in the other end region in the X direction of the top surface of the base member 10A, for accommodating and arranging multiple capacitors 12. The accommodating recess 40 is formed in a substantially rectangular shape when viewed from above. The short sides of the accommodating recess 40 extend along the X direction, and the long sides of the accommodating recess 40 extend along the Y direction. Multiple capacitors 12 are accommodated in the accommodating recess 40, with the axial direction of the capacitors 12 aligned with the X direction (the short sides of the accommodating recess 40).

[0036] Recesses 45a, 45b, each having a substantially right-angled triangular shape in top view, are provided at the left and right corners (left and right in FIG. 4 ) of one end and the other end of the accommodating recess 40 in the X direction and extend outward in the left-right direction beyond the short sides of the accommodating recess 40. The left and right recesses 45a at one end in the X direction are formed so that one side of the substantially triangular shape is continuous with the long side of the accommodating recess 40 at one end in the X direction. Similarly, the left and right recesses 45b at the other end in the X direction are formed so that one side of the substantially triangular shape is continuous with the long side of the accommodating recess 40 at the other end in the X direction. In other words, the recesses 45a, 45b at the four corners are formed so as to extend each corner of the accommodating recess 40 in the left-right direction (Y direction). In addition, a plurality of capacitors 12 are arranged in parallel in the Y direction in the accommodation recess 40.

[0037] In this embodiment, the bottom walls of the accommodating recess 40 and the recessed portions 45b, 45a at the four corners form the capacitor mounting wall 32. The capacitor mounting wall 32 is made of a metal material with high thermal conductivity, similar to other portions of the base member 10A.

[0038] Two strip-shaped insulating papers 35A and 35B are attached to the capacitor mounting wall 32, spaced apart in the X direction. The two insulating papers 35A and 35B are formed into a congruent trapezoidal shape when viewed from above. Each of the insulating papers 35A and 35B has an acute-angled corner 35a at its longitudinal end. One of the insulating papers 35A is placed on the capacitor mounting wall 32 with one of its long sides aligned with one end of the accommodating recess 40 in the X direction. At this time, the left and right corners 35a of the insulating paper 35A are engaged with the corresponding left and right recesses 45a. Meanwhile, the other insulating paper 35B is placed on the capacitor mounting wall 32 with one of its long sides aligned with the other end of the accommodating recess 40 in the X direction. At this time, the left and right corners 35a of the insulating paper 35B are engaged with the corresponding left and right recesses 45b. In this embodiment, the insulating papers 35A and 35B form an insulating member.

[0039] The two insulating papers 35A and 35B are positioned on the capacitor mounting wall 32 by engaging the corners 35a with the corresponding recesses 45a and 45b. In this embodiment, the recesses 45a and 45b form positioning portions with which the corners of the insulating members (insulating papers 35A and 35B) are engaged.

[0040] The two insulating papers 35A, 35B attached to the capacitor mounting wall 32 are spaced a predetermined distance apart in the X direction. In this state, the plurality of capacitors 12 are mounted on the two insulating papers 35A, 35B. At this time, one axial end of each of the plurality of capacitors 12 is mounted on the upper surface of one insulating paper 35A, and the other axial end of each of the plurality of capacitors 12 is mounted on the upper surface of the other insulating paper 35B. This means that when viewed from the side of the insulating papers 35A, 35B (insulating members), the insulating papers 35A, 35B are arranged at a position spanning one axial end side of each of the multiple capacitors 12 and a position spanning the other axial end side of each of the multiple capacitors 12.

[0041] As a preliminary step before the multiple capacitors 12 are placed on the upper surfaces of the two insulating papers 35A, 35B as described above, a thermally conductive adhesive 38 with high thermal conductivity is applied to the area between the two insulating papers 35A, 35B on the capacitor mounting wall 32 where no insulating paper is present.

[0042] As shown in Fig. 4, the thermally conductive adhesive 38 is applied along the X direction on the capacitor mounting wall 32 directly below the position where each capacitor 12 will be placed. The thermally conductive adhesive 38 is applied to a fixed width on the capacitor mounting wall 32, and when each capacitor 12 is placed on the two insulating papers 35A, 35B, the central region in the width direction is crushed by the outer peripheral surface of each capacitor 12 (see Fig. 5). At this time, the thickness of the thermally conductive adhesive 38 in the portion crushed by the outer peripheral surface of the capacitor 12 is the same as the thickness of the insulating papers 35A, 35B.

[0043] After each capacitor 12 is placed on the two insulating papers 35A, 35B in this manner, when the thermally conductive adhesive 38 hardens, each capacitor 12 is fixed onto the capacitor mounting wall 32 by the thermally conductive adhesive 38. It is preferable to use an ultraviolet-curing type thermally conductive adhesive 38. When an ultraviolet-curing type thermally conductive adhesive 38 is used, it becomes possible to quickly fix the capacitor 12 to the capacitor mounting wall 32 by irradiating the adhesive application area with ultraviolet light without applying heat to the capacitor 12.

[0044] (Action and effect) As described above, in the control device 1 of this embodiment, insulating papers 35A, 35B (insulating members) are interposed between the capacitor mounting wall 32 of the case 10 and a part of the capacitor 12, and thermally conductive adhesive 38 is interposed in the area between the capacitor mounting wall 32 and the capacitor 12 where the insulating papers 35A, 35B are not placed. Therefore, the capacitor 12 and the capacitor mounting wall 32 are electrically insulated by the insulating papers 35A, 35B, and the capacitor 12 is fixed onto the capacitor mounting wall 32 in the area where the insulating papers 35A, 35B are not present.

[0045] When fixing the capacitor 12 to the capacitor mounting wall 32, the thermally conductive adhesive 38 is applied to the areas where the insulating papers 35A and 35B are not arranged, and then the capacitor 12 is placed on the insulating papers 35A and 35B in this state. In this state, the fixing work of the capacitor 12 can be completed by simply waiting for the thermally conductive adhesive 38 to harden. This allows the fixing work of the capacitor 12 to the capacitor mounting wall 32 to be performed efficiently.

[0046] Furthermore, in the control device 1 of this embodiment, heat generated by the capacitor 12 can be efficiently transferred to the capacitor mounting wall 32 through the thermally conductive adhesive 38. Furthermore, the thickness of the thermally conductive adhesive 38 interposed between the capacitor 12 and the capacitor mounting wall 32 can be controlled to be approximately constant by the thickness of the insulating papers 35A and 35B.

[0047] Therefore, when the control device 1 of this embodiment is adopted, it is possible to improve the heat dissipation of the condenser 12 and to improve the efficiency of the work of fixing the condenser 12 to the condenser mounting wall 32. As a result, it is possible to contribute to Goal 7 "Ensure access to affordable, reliable, sustainable and modern energy for all" and Goal 8 "Promote sustained, inclusive and sustainable economic growth, full and productive employment and decent work for all" of the Sustainable Development Goals (SDGs) led by the United Nations.

[0048] Furthermore, in the control device 1 of this embodiment, a plurality of insulating members (insulating papers 35A, 35B) are arranged so as to support the capacitor 12 at a plurality of spaced locations in the extension direction. This allows the capacitor 12 to be maintained in a stable position until the thermally conductive adhesive 38 hardens. Furthermore, this configuration makes it easier to maintain a constant gap between the capacitor 12 and the capacitor mounting wall 32, between which the thermally conductive adhesive 38 is interposed. Therefore, when the control device 1 of this embodiment is adopted, it becomes possible to more easily fix the capacitor 12 with the thermally conductive adhesive 38, and it is also possible to make the thickness of the thermally conductive adhesive 38 uniform, thereby enabling efficient dissipation of heat from the outer surface of the capacitor 12 to the outside. In this embodiment, the capacitor 12 is supported on the capacitor mounting wall 32 at two points spaced apart in the axial direction by two pieces of insulating paper 35A, 35B (insulating members), but the capacitor 12 may also be supported by insulating members at three or more points spaced apart in the extension direction.

[0049] In addition, in the control device 1 of this embodiment, multiple cylindrical capacitors 12 are arranged in parallel in a direction intersecting the axial direction of the capacitors 12, and two insulating papers 35A, 35B (insulating members) are arranged at a position spanning one axial end of each of the multiple capacitors 12 and a position spanning the other axial end of each of the multiple capacitors 12. Thermally conductive adhesive 38 is arranged between the capacitor mounting wall 32 and each capacitor 12 in a region between one insulating paper 35A (insulating member) and the other insulating paper 35B (insulating member). This allows one axial end and the other axial end of each of the multiple capacitors 12 to be supported by the corresponding insulating papers 35A, 35B. Therefore, while the axial central regions of the multiple capacitors 12 are electrically insulated by the thermally conductive adhesive 38, both axial ends of each of the multiple capacitors 12 can be stably supported by the two insulating papers 35A, 35B.

[0050] Furthermore, the control device 1 of this embodiment can stably adhere and fix multiple capacitors 12 arranged in parallel to the capacitor mounting wall 32 using the thermally conductive adhesive 38 in the area between the two insulating papers 35A and 35B.

[0051] Furthermore, the control device 1 of this embodiment employs insulating papers 35A and 35B as insulating members. Therefore, the easy-to-handle insulating papers 35A and 35B can electrically insulate the capacitor 12 from the capacitor mounting wall 32. Furthermore, in this configuration, the insulating papers 35A and 35B, which are insulating members, are thin, so that the capacitor 12 can be placed closer to the capacitor mounting wall 32, thereby further improving the heat dissipation of the capacitor 12.

[0052] Furthermore, in the control device 1 of this embodiment, the two insulating papers 35A, 35B are formed in a congruent trapezoidal shape, and recesses 45a, 45b (positioning portions) into which the corners 35a of each insulating paper 35A, 35B engage are formed at positions on the capacitor mounting wall 32 where the two insulating papers 35A, 35B are to be placed. Therefore, by engaging the corners 35a of the two insulating papers 35A, 35B with the recesses 45a, 45b on the capacitor mounting wall 32, the two insulating papers 35A, 35B can be accurately placed in specified positions on the capacitor mounting wall 32.

[0053] Furthermore, in this configuration, since the two insulating papers 35A, 35B have a congruent trapezoidal shape, the insulating papers 35A, 35B with common specifications can be used in two corresponding locations on the capacitor mounting wall 32. This makes it possible to reduce the number of components used.

[0054] The present invention is not limited to the above-described embodiment, and various design modifications are possible without departing from the spirit of the present invention. For example, in the above-described embodiment, an aluminum electrolytic capacitor is used as the capacitor 12, but the type of capacitor is not limited to this. Various other types of capacitors may also be used.

[0055] Furthermore, in the above embodiment, insulating paper 35A, 35B is used as the insulating member, but the insulating member is not limited to insulating paper. The insulating member may be, for example, an insulating resin or ceramic. Even when the insulating member is a member other than insulating paper 35A, 35B, it is desirable that the insulating member be a thin, sheet-like member with a uniform thickness.

[0056] In the above embodiment, the entire base member 10A, including the capacitor mounting wall 32, is formed of a metal material with high thermal conductivity. However, the configuration of the base member is not limited to this, and only a portion of the base member, including the capacitor mounting wall 32, may be formed of a metal material. [Explanation of symbols]

[0057] 1...control device, 10...case, 10a...fin, 10b...opening, 10A...base member, 10B...case body, 10Ba...body block portion, 10Bb...bus bar support portion, 11...first board, 12...capacitor, 13A, 13B, 13C...support portion, 14...second board, 17A, 17B...battery side bus bar, 17Aa, 17Ba...terminal fixing portion, 17Ab, 17Bb...circuit fixing portion, 18A, 18B, 18C... Motor side bus bars, 18Aa, 18Ba, 18Ca... Terminal fixing portion, 18Ab, 18Bb, 18Cb... Circuit fixing portion, 21... Board-to-board connector, 22... Signal connector, 31... Cover, 32... Capacitor mounting wall, 35A, 35B... Insulating paper (insulating member), 35a... Corner portion, 38... Thermally conductive adhesive, 40... Storage recess, 45a, 45b... Recessed portion (positioning portion)

Claims

1. A capacitor, a case having a capacitor mounting wall with high thermal conductivity and accommodating the capacitor in a state in which the capacitor is mounted on the capacitor mounting wall; an insulating member interposed between the capacitor mounting wall and a portion of the capacitor; a thermally conductive adhesive having high thermal conductivity that is applied to an area between the capacitor mounting wall and the capacitor where the insulating member is not disposed; A control device comprising:

2. 2. The control device according to claim 1, wherein a plurality of the insulating members are arranged so as to support the capacitor at a plurality of locations spaced apart in the extending direction of the capacitor.

3. the capacitor is a cylindrical capacitor, A plurality of the capacitors are arranged in parallel in a direction intersecting the axial direction of the capacitors, the insulating member is disposed at a position spanning one end side of each of the plurality of capacitors in the axial direction and at a position spanning the other end side of each of the plurality of capacitors in the axial direction, 3. The control device according to claim 2, characterized in that the thermally conductive adhesive is arranged between the capacitor mounting wall and each of the capacitors in the region between the insulating member arranged in a position spanning the one end side and the insulating member arranged in a position spanning the other end side.

4. 4. The control device according to claim 3, wherein the insulating member is insulating paper.

5. the insulating member arranged at a position spanning the one end side and the insulating member arranged at a position spanning the other end side are formed in a congruent trapezoidal shape, 5. The control device according to claim 3, wherein positioning portions are disposed on the capacitor mounting wall at positions where the two insulating members are mounted, with which corners of each insulating member are engaged.

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