Motor controller

Abstract

To provide a motor controller that can be easily miniaturized while ensuring the insulation distance of a bus bar from a substrate.SOLUTION: A motor controller includes a printed circuit board 20 on which a switching element 22 is surface-mounted, bus bars 31, 32 surface-mounted on the printed circuit board 20 and connected to the switching element 22, and an electrolytic capacitor 60 electrically connected to the switching element 22 via the bus bars 31, 32. The bus bars 31, 32 have main body portions 41, 51 connected to the printed circuit board 20, and bus bar terminals 42, 52 connected to the main body portions 41, 51 and connected to the electrolytic capacitor 60. The bus bar terminals 42, 52 have rising portions rising from the surface 20b of the printed circuit board 20, and capacitor connection portions 47, 57 bent and extended from the tips of the rising portions toward the electrolytic capacitor 60 and connected to the electrolytic capacitor 60.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a motor control device. [Background technology]

[0002] Conventionally, there has been known a motor control device that converts DC power supplied from a battery into AC power and drives an AC motor (hereinafter also referred to as a motor) with the converted AC power. The motor control device includes a substrate (switching module) on which switching elements are surface-mounted. In addition to the switching elements, an electrolytic capacitor (hereinafter also referred to as a capacitor) for smoothing the current flowing to the motor is surface-mounted (SMT: Surface Mount Technology) on the substrate. Here, if the inductance of the current flow path (current flow distance) is large, the ripple current flowing in the capacitor becomes large, and there is a risk of thermal damage to the capacitor.

[0003] As a countermeasure, for example, selecting a capacitor that can absorb ripple current or increasing the number of capacitors is known. However, from the viewpoint of miniaturization and cost reduction of the motor control device, it is preferable to implement a measure to reduce inductance. In order to reduce inductance, it is effective to shorten the current path and to arrange the input and output in parallel facing each other with a wide area.

[0004] As a motor control device that has a wide area between input and output, there is known a device in which a switching element, which is a heat generating element, and a capacitor are connected by a bus bar. The bus bar is integrally formed with a first terminal connected to the switching element, a second terminal connected to the capacitor, and a connecting part that connects the first terminal and the second terminal. The first terminal is bent toward the capacitor. The busbars are provided for positive and negative electrodes, with the connecting portion for the positive electrode and the connecting portion for the negative electrode arranged opposite each other. The busbars are bent into an L shape so that the end of the first terminal on the capacitor side rises from the substrate. A second terminal is formed at the tip of the bent busbar. This ensures an insulation distance between the substrate and the connection point (second terminal) of the busbar with the capacitor (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2003-319665 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, the bus bar in the motor control device described above is simply bent into an L shape so as to rise from the board, which limits the degree of freedom in the layout of the capacitors, resulting in a problem that the motor control device tends to become large in size.

[0007] Therefore, the present invention provides a motor control device that can be easily downsized while ensuring the insulation distance between the bus bar and the substrate. [Means for solving the problem]

[0008] In order to solve the above problems, in a first aspect of the present invention, a motor control device comprises a substrate having a heat-generating element surface-mounted thereon, a busbar surface-mounted on the substrate and connected to the heat-generating element, and a capacitor arranged alongside the substrate along the extension direction of the substrate and electrically connected to the heat-generating element via the busbar, wherein the busbar has a main body portion connected to the substrate, and a busbar terminal coupled to the main body portion and connected to the capacitor, and the busbar terminal has a rising portion rising from the surface of the substrate, and a connection portion bent and extended from an end of the rising portion opposite the substrate towards the capacitor and connected to the capacitor.

[0009] In this way, by configuring the bus bar terminals with the rising portions and the connection portions, the degree of freedom in the layout of the capacitors in the normal direction to the substrate can be increased, which makes it easier to miniaturize the motor control device while ensuring the insulation distance between the substrate and the connection portions of the bus bars.

[0010] A second aspect of the present invention is a motor control device according to the first aspect, which includes a plurality of the capacitors, each of which has a lead terminal connected to the connection portion, and which is arranged so that the lead terminals are lined up in one direction, and the bus bar has a plurality of the bus bar terminals connected to the plurality of capacitors, and each of the connection portions is arranged in a row in the same direction as the arrangement direction of the lead terminals.

[0011] With this configuration, the motor control device can be made smaller while facilitating the connection work between the lead terminals and the bus bar terminals, thereby improving the productivity of the motor control device.

[0012] A third aspect of the present invention is a motor control device according to the first or second aspect, wherein the busbar includes a first busbar and a second busbar, each connected to one of the capacitors, and the main body portion includes a first body portion provided on the first busbar and a second body portion provided on the second busbar, and the first body portion and the second body portion are arranged opposite each other in the arrangement direction of the heat generating element and the capacitor, between the heat generating element and the capacitor.

[0013] In this way, by arranging the first body and the second body opposite each other in the arrangement direction of the heating element and the capacitor, it is possible to reduce the size of the motor control device while shortening the current paths between each bus bar terminal and the heating element, thereby reducing inductance and ensuring an insulation distance between the heating element and the capacitor via the bus bar.

[0014] A fourth aspect of the present invention is the motor control device according to any one of the first to third aspects, wherein the main body has a tongue portion extending from an end of the main body on an opposite side to the board.

[0015] With this configuration, for example, when assembling a motor control device, the bus bar can be easily transported to a desired position by gripping the tongue portion, thereby improving the ease of assembly of the motor control device while miniaturizing the motor control device.

[0016] A fifth aspect of the present invention relates to the motor control device of the fourth aspect, wherein the tongue portion extends in a direction parallel to the substrate.

[0017] With this configuration, for example, when transporting the bus bar, it is possible to lift it up by suction, for example, with the main body kept aligned along the normal direction of the board, which further improves the ease of assembly of the motor control device.

[0018] A sixth aspect of the present invention is the motor control device according to any one of the first to fifth aspects, wherein the main body has legs that protrude from side surfaces of the main body and come into contact with the board.

[0019] Here, if the main body is arranged so as to be aligned along the normal direction of the substrate, the posture of the busbar becomes unstable. In this state, the legs protrude from the side surfaces of the main body and abut against the substrate. This allows the legs to function as a means for preventing the busbar from falling over. This makes it possible to miniaturize the motor control device while improving the reliability of the motor control device.

[0020] A seventh aspect of the present invention is the motor control device according to the sixth aspect, wherein the legs are connected to the board.

[0021] With this configuration, the position of the bus bar relative to the circuit board can be reliably maintained without increasing the size of the bus bar, thereby further improving the reliability of the motor control device. Effect of the Invention

[0022] According to the present invention, a motor control device is provided that can be easily downsized while ensuring the insulation distance between the bus bar and the substrate. [Brief description of the drawings]

[0023] [Figure 1] 1 is a perspective view showing a motor control device according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a view taken along the arrow II in FIG. [Diagram 3] 1 is a perspective view of a motor control device according to an embodiment of the present invention with a case removed; [Figure 4] FIG. 4 is an exploded perspective view of the motor control device shown in FIG. [Diagram 5] 5A and 5B are diagrams illustrating a connection state between a bus bar and a capacitor in an embodiment of the present invention. [Figure 6] 6 is a plan view showing the electrolytic capacitor and its periphery in a view taken along the arrow VI in FIG. [Figure 7] FIG. 11 is a perspective view of a motor control device according to a modified embodiment of the present invention with the case removed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Next, an embodiment of the present invention will be described with reference to the drawings.

[0025] <Motor control device> Fig. 1 is a perspective view of a motor control device according to an embodiment of the present invention, and Fig. 2 is a side view of the motor control device of Fig. 1. 1 and 2, the motor control device 1 has an inverter function that converts DC power supplied from a battery (not shown), for example, into AC power and drives an AC motor (not shown) with the converted AC power. The motor control device 1 has a case 10, a plate-shaped printed circuit board (substrate) 20 and a plurality of (e.g., eight in this embodiment) cylindrical electrolytic capacitors (capacitors) 60 housed in the case 10, and a bus bar 30 surface-mounted (SMT) on a surface 20b of the printed circuit board 20.

[0026] The electrolytic capacitors 60 are arranged in parallel in a direction perpendicular to the longitudinal direction (axial direction). Hereinafter, the longitudinal direction (axial direction) of the electrolytic capacitors 60 will be referred to as the X-direction. The direction in which the electrolytic capacitors 60 are arranged in parallel will be referred to as the Y-direction. The direction perpendicular to the front surface 20b of the printed circuit board 20 (normal direction) will be referred to as the Z-direction. The printed circuit board 20 and the electrolytic capacitor 60 are arranged side by side along the extension direction of the printed circuit board 20 and along the X direction. That is, the electrolytic capacitor 60 is arranged at one end 20a of the printed circuit board 20 in the X direction. The electrolytic capacitor 60 will be described in detail later.

[0027] <Case> The case 10 is formed in a box shape with one side open. The case 10 houses the printed circuit board 20, the bus bar 30, and a plurality of electrolytic capacitors 60 together with a cover (not shown) that closes the opening of the case 10. The case 10 is provided with a plurality of heat dissipation fins 12 on an outer surface 10a of the area where the printed circuit board 20 and the plurality of electrolytic capacitors 60 are housed. Hereinafter, the heat dissipation fins 12 may be referred to as "heat dissipation fins 12."

[0028] The multiple heat dissipation fins 12 are arranged, for example, at intervals in the Y direction on the outer surface 10a of the case 10. The multiple heat dissipation fins 12 extend in the X direction from the end 10b side where the electrolytic capacitors 60 are housed to the side where the printed circuit board 20 is housed. The multiple heat dissipation fins 12 protrude outward in the Z direction from the outer surface 10a of the case 10. The multiple heat dissipation fins 12 dissipate heat from the printed circuit board 20, the bus bar 30, and the multiple electrolytic capacitors 60 to the outside of the case 10.

[0029] <Printed circuit board> Fig. 3 is a perspective view of the motor control device of Fig. 1 with a case removed. Fig. 4 is an exploded perspective view of the motor control device of Fig. 3. 3 and 4, the printed circuit board 20 is formed, for example, in a rectangular shape when viewed from the Z direction. The printed circuit board 20 is a PWB (Printed Wiring Board) on which a plurality of switching elements 22 are surface-mounted. The ON / OFF operation of the switching elements 22 is controlled by a switching control circuit (not shown), thereby operating the motor control device 1 under optimal conditions according to the driving state of the AC motor.

[0030] The printed circuit board 20 is provided with a plurality of first pattern terminals 23 and a plurality of second pattern terminals 24 at one end 20a on the side where the bus bar 30 is arranged. The plurality of first pattern terminals 23 and the plurality of second pattern terminals 24 are alternately arranged at intervals in the Y direction. The plurality of first pattern terminals 23 and the plurality of second pattern terminals 24 are exposed on a surface 20b of the printed circuit board 20.

[0031] The first pattern terminal 23 is electrically connected to the positive electrode of the switching element 22, for example, via a wiring pattern (not shown) formed on the printed circuit board 20. The second pattern terminal 24 is electrically connected to the negative electrode of the switching element 22, for example, via a wiring pattern (not shown) formed on the printed circuit board 20. In the embodiment, the first pattern terminal 23 is described as a positive electrode and the second pattern terminal 24 is a negative electrode, but this is not limited to this. As another example, the first pattern terminal 23 may be a negative electrode and the second pattern terminal 24 may be a positive electrode.

[0032] <Busbar> FIG. 5 is a diagram showing a connection state between the bus bar 30 and the electrolytic capacitor 60, and corresponds to the above-mentioned FIG. 3 to 5, a bus bar 30 is connected to the plurality of first pattern terminals 23 and the plurality of second pattern terminals 24 of the printed circuit board 20. The bus bar 30 is connected to the plurality of first pattern terminals 23 and the plurality of second pattern terminals 24, and is thereby surface-mounted on the front surface 20b of the printed circuit board 20. The bus bar 30 electrically connects the plurality of electrolytic capacitors 60 and the plurality of switching elements 22. The bus bar 30 includes a first bus bar 31 and a second bus bar 32. In the embodiment, for example, the first bus bar 31 is described as a positive electrode and the second bus bar 32 is described as a negative electrode, but this is not limited to this. As another example, for example, the first bus bar 31 may be a negative electrode and the second bus bar 32 may be a positive electrode.

[0033] The first bus bar 31 is formed of a plate-shaped conductive material. The first bus bar 31 has a first body portion 41 extending in the Y direction along the multiple first pattern terminals 23 and the multiple second pattern terminals 24 of the printed circuit board 20, and multiple first bus bar terminals 42 and first leg portions 43 connected to the first body portion 41. For example, the number of each of the pattern terminals 23, 24 is four, totaling eight. The number of the first bus bar terminals 42 is also eight. The total number of these pattern terminals 23, 24 and the number of the first bus bar terminals 42 correspond to the number of the electrolytic capacitors 60.

[0034] The first body portion 41 is formed in a plate shape long in the Y direction. That is, the first body portion 41 is formed in a rectangular shape by extending at a constant height from one side 20c to the other side 20d in the Y direction of the printed circuit board 20. The first body portion 41 is disposed so as to be perpendicular to the surface 20b of the printed circuit board 20. That is, the thickness direction of the first body portion 41 coincides with the X direction. Therefore, the first body portion 41 is formed to have an area as large as possible by the width dimension in the Y direction and the height dimension in the Z direction.

[0035] In the embodiment, an example in which the first body portion 41 is perpendicular to the printed circuit board 20 will be described, but the present invention is not limited to this. As another example, the first body portion 41 may cross the printed circuit board 20. That is, the first body portion 41 may be disposed so as to be aligned along the normal direction (Z direction) of the front surface 20b of the printed circuit board 20. The first body portion 41 is disposed between one end portion 20a of the printed circuit board 20 and the multiple switching elements 22. The first body portion 41 is disposed close to the multiple switching elements 22 and toward the multiple switching elements 22.

[0036] The multiple first bus bar terminals 42 are bent and extended from an edge 41a of the first body portion 41 on the printed circuit board 20 side toward the electrolytic capacitor 60. In other words, the multiple first bus bar terminals 42 are bent and extended from the edge 41a of the first body portion 41 toward the opposite side to the switching element 22. The multiple first bus bar terminals 42 are arranged at equal intervals in the Y direction.

[0037] The first bus bar terminal 42 has a first pattern connecting portion 45 bent and extended from the first main body portion 41, a first rising portion 46 extended from a tip (the end opposite to the first main body portion 41) of the first pattern connecting portion 45, and a first capacitor connecting portion 47 extended from a tip (the end opposite to the first pattern connecting portion 45) of the first rising portion 46. The first pattern connecting portion 45 extends along the first pattern terminal 23. The first pattern connecting portion 45 is connected to the first pattern terminal 23 of the printed circuit board 20 by soldering through surface mounting.

[0038] The first pattern connection portion 45 is electrically connected to the positive electrode of the switching element 22 via the first pattern terminal 23 and a wiring pattern (not shown). That is, the first body portion 41 is electrically connected to the positive electrode of the switching element 22 via the first pattern connection portion 45, the first pattern terminal 23, and the wiring pattern.

[0039] The first rising portion 46 is bent and extended from the tip of the first pattern connection portion 45 so as to be separated in the Z direction with respect to the printed circuit board 20. In other words, the first rising portion 46 rises from the front surface 20b of the printed circuit board 20. The first capacitor connection portion 47 is bent and extended from the tip of the first rising portion 46 toward the electrolytic capacitor 60 in parallel to the first pattern connection portion 45. That is, the first capacitor connection portion 47 is disposed with a gap therebetween with respect to the printed circuit board 20 in the Z direction. A recess 48 is formed at the tip of the first capacitor connection portion 47. A first lead terminal 61 of the electrolytic capacitor 60, which will be described later, is fitted into the recess 48.

[0040] The first leg portion 43 is bent and extended from an end portion 41b of the first body portion 41 on one side edge 20c side of the printed circuit board 20 toward the switching element 22. In other words, the first leg portion 43 protrudes from a side surface 41c of the first body portion 41 on the switching element 22 side. A protruding piece 43a that protrudes toward the printed circuit board 20 is integrally formed at the end of the first leg 43 on the printed circuit board 20 side. The protruding piece 43a is connected to the surface 20b of the printed circuit board 20. In other words, the first leg 43 abuts against the surface 20b of the printed circuit board 20.

[0041] The basic configuration of the second busbar 32 is similar to that of the first busbar 31. Therefore, in the following description of each part of the second busbar 32, the names of each part of the first busbar 31 will be changed from "first" to "second" and the reference numerals will be changed, and the description will be omitted. Only the points of the configuration of the second busbar 32 that differ from the first busbar 31 will be described.

[0042] The second bus bar 32 is formed from a plate-shaped conductive material, and has a second main body portion 51, a plurality of second bus bar terminals 52, and a second leg portion 53. The second body portion 51 is disposed between one end portion 20a of the printed circuit board 20 and the multiple switching elements 22. The second body portion 51 is disposed closer to the one end portion 20a of the printed circuit board 20 than the first body portion 41. The second body portion 51 faces the first body portion 41 in the X direction.

[0043] The second bus bar terminals 52 each have a second pattern connection portion 55, a second rising portion 56, and a second capacitor connection portion 57. The second pattern connection portion 55 is connected to the second pattern terminal 24 of the printed circuit board 20 by surface mounting with solder. The second pattern connection portion 55 is electrically connected to the negative electrode of the switching element 22 via the second pattern terminal 24 and a wiring pattern (not shown). In other words, the second main body portion 51 is electrically connected to the negative electrode of the switching element 22 via the second pattern connection portion 55, the second pattern terminal 24, and the wiring pattern.

[0044] The first busbar 31 and the second busbar 32 are arranged with the first main body portion 41 and the second main body portion 51 slightly misaligned in the Y direction. In this state, the multiple second busbar terminals 52 are arranged between the multiple first busbar terminals 42 in the Y direction. The arrangement of the first busbar terminals 42 and the second busbar terminals 52 will be described in detail later. A recess 58 is formed at the tip of the second capacitor connecting portion 57. A second lead terminal 62 of the electrolytic capacitor 60, which will be described later, is fitted into the recess 58. The second leg portion 53 is bent and extended from an end portion 51b of the other side edge 20d of the printed circuit board 20 of the second main body portion 51 toward the switching element 22. In other words, the second leg portion 53 protrudes from a side surface 51c of the second main body portion 51 on the switching element 22 side. The protruding piece 53a of the second leg portion 53 is connected to the surface 20b of the printed circuit board 20. In other words, the second leg portion 53 abuts against the surface 20b of the printed circuit board 20.

[0045] FIG. 6 is a plan view showing the electrolytic capacitor 60 and its periphery, taken along the line VI in FIG. 5 and 6, the first capacitor connection portions 47 of the first bus bar terminals 42 and the second capacitor connection portions 57 of the second bus bar terminals 52 are alternately arranged in a row in the Y direction. In other words, the first capacitor connection portions 47 and the second capacitor connection portions 57 are linearly arranged along a straight line L extending in the Y direction. In particular, the recesses 48 of the first capacitor connection portions 47 and the recesses 58 of the second capacitor connection portions 57 are linearly arranged along the straight line L extending in the Y direction. Furthermore, the first capacitor connection portions 47 and the second capacitor connection portions 57 are arranged at the same height H in the direction away from the printed circuit board 20.

[0046] <Electrolytic capacitor> Electrolytic capacitor 60 is disposed such that end face 60a facing bus bar 30 is at the same distance D from first capacitor connecting portion 47 and second capacitor connecting portion 57. 3, 5, and 6, the electrolytic capacitor 60 has a first lead terminal 61 protruding from an end face 60a and a second lead terminal 62 protruding from the end face 60a. The first lead terminal 61 and the second lead terminal 62 protrude from the end face 60a of the electrolytic capacitor 60 toward the printed circuit board 20 with a gap therebetween in the Y direction.

[0047] The first lead terminal 61 and the second lead terminal 62 protrude from the end face 60a and are bent and extended halfway to the opposite side of the case 10 (see FIG. 1). The first lead terminal 61 and the second lead terminal 62 are arranged alternately in a line in the Y direction. In other words, the first lead terminal 61 and the second lead terminal 62 are arranged linearly along a straight line L extending in the Y direction. The height of the tip of each lead terminal 61, 62 is the same.

[0048] With this configuration, the first capacitor connection portion 47 provided on the first bus bar 31 and the second capacitor connection portion 57 provided on the second bus bar 32 are disposed near the tips of the respective lead terminals 61, 62. As a result, the first lead terminal 61 is inserted into the recess 48 of the first capacitor connection portion 47. In this state, the first lead terminal 61 is directly connected to the first capacitor connection portion 47 by solder. The second lead terminal 62 is inserted into the recess 58 of the second capacitor connection portion 57. In this state, the second lead terminal 62 is directly connected to the second capacitor connection portion 57 by solder.

[0049] As a result, the electrolytic capacitor 60 is electrically connected to the switching element 22 via the bus bar 30. The electrolytic capacitor 60 has a function of suppressing fluctuations in DC voltage caused by the switching operation of the switching element 22. In the embodiment, the electrolytic capacitor 60 is described as an example of the capacitor, but the capacitor is not limited to the electrolytic capacitor 60. As another example, for example, a capacitor having a sufficiently large capacitance capable of suppressing the fluctuation of the DC voltage within a target value may be used.

[0050] As described above, the motor control device 1 includes the printed circuit board 20 on which the switching elements 22 are surface-mounted, the bus bar 30 that is surface-mounted on the printed circuit board 20 and connected to the switching elements 22, and the electrolytic capacitor 60 that is arranged alongside the printed circuit board 20 along the extension direction of the printed circuit board 20. Each bus bar 31, 32 of the bus bar 30 includes a main body portion 41, 51 and a plurality of bus bar terminals 42, 52 that are connected to the main body portion 41, 51. Each bus bar terminal 42, 52 has a pattern connection portion 45, 55, a rising portion 46, 56, and a capacitor connection portion 47, 57. Each rising portion 46, 56 rises from the surface 20b of the printed circuit board 20. Each capacitor connection portion 47, 57 is bent and extended from the tip of each rising portion 46, 56 toward the electrolytic capacitor 60 side in parallel with each pattern connection portion 45, 55.

[0051] In this way, since each bus bar terminal 42, 52 has the rising portion 46, 56 and the capacitor connection portion 47, 57, the degree of freedom in layout of the electrolytic capacitor 60 in the normal direction of the printed circuit board 20 can be increased. This makes it easier to miniaturize the motor control device 1 while ensuring the insulation distance between the printed circuit board 20 and the capacitor connection portion 47, 57. For example, when it is desired to increase the fin height of the heat dissipation fins 12 (see FIGS. 1 and 2) formed along the electrolytic capacitor 60, it is possible to ensure a large fin height by moving the electrolytic capacitor 60 in the Z direction intersecting the printed circuit board 20.

[0052] The first capacitor connection portion 47 of the first busbar terminal 42 and the second capacitor connection portion 57 of the second busbar terminal 52 are alternately arranged in a row in the Y direction. In other words, the first capacitor connection portion 47 and the second capacitor connection portion 57 are linearly arranged along a straight line L extending in the Y direction. In particular, the recess 48 of the first capacitor connection portion 47 and the recess 58 of the second capacitor connection portion 57 are linearly arranged along the straight line L extending in the Y direction. In particular, the recess 48 of the first capacitor connection portion 47 and the recess 58 of the second capacitor connection portion 57 are linearly arranged along the straight line L. The recess 48 is fitted into the first lead terminal 61 of the electrolytic capacitor 60. The recess 58 is fitted into the second lead terminal 62 of the electrolytic capacitor 60. In this way, the first lead terminal 61 and the second lead terminal 62 are linearly arranged along the straight line L.

[0053] This improves the workability of soldering when connecting the capacitor connecting portions 47, 57 corresponding to the lead terminals 61, 62 with solder. This makes it possible to facilitate the soldering work. For example, the soldering work can be performed by an automated machine such as a robot, thereby improving productivity. In addition, the first capacitor connection portion 47 and the second capacitor connection portion 57 are disposed at the same height H relative to the printed circuit board 20. This allows the soldering operation to be more suitably performed by an automated machine such as a robot.

[0054] Each end face 60a of the electrolytic capacitor 60 is disposed at an equal distance D from the first capacitor connection portion 47 of the first bus bar terminal 42 and the second capacitor connection portion 57 of the second bus bar terminal 52. This makes it possible to uniformize the charge / discharge distance of the electrolytic capacitor 60. This makes it possible to uniformize the usage rate of the electrolytic capacitor 60.

[0055] The main body portions 41, 51 of the bus bars 31, 32 are arranged to face each other in the X direction (the direction in which the switching element 22 and the electrolytic capacitor 60 are arranged). Therefore, the area required for mounting the bus bars 31, 32 on the printed circuit board 20 can be made as small as possible, and the motor control device 1 can be made compact. Since the current path between the bus bar terminals 42, 52 and the switching element 22 can be shortened, the inductance can be reduced. In addition, the switching element 22 and the electrolytic capacitor 60 are connected via the bus bar 30. The bus bar 30 is arranged at one end 20a in the X direction of the printed circuit board 20 on which the switching element 22 is surface-mounted. Therefore, the insulation distance between the switching element 22 and the electrolytic capacitor 60 can be ensured.

[0056] The main body portions 41, 51 of the bus bars 31, 32 are arranged to face each other in the X direction, and are formed to have as large an area as possible. The pattern connection portions 45, 55 of the bus bars 31, 32 are connected by soldering to the pattern terminals 23, 24 surface-mounted on the front surface 20b of the printed circuit board 20. This minimizes the area required for surface mounting each of the bus bars 31, 32 on the printed circuit board 20. It also shortens the current path from the switching element 22 to each of the bus bars 31, 32 (first pattern connection portion 45, second pattern connection portion 55).

[0057] Furthermore, the first pattern connection portion 45 and the second pattern connection portion 55, which are surface-mounted on the front surface 20b of the printed circuit board 20, are connected to the electrolytic capacitor 60. Therefore, the current path from the switching element 22 to the electrolytic capacitor 60 can be shortened. By arranging the first body portion 41 and the second body portion 51, each having a large area, facing each other and further shortening the current path, the inductance of the motor control device 1 can be reduced.

[0058] The first pattern connection portion 45 of the first bus bar 31 and the second pattern connection portion 55 of the second bus bar 32 are surface-mounted on the front surface 20b of the printed circuit board 20. Furthermore, the first pattern connection portion 45 and the first pattern connection portion 45 surface-mounted on the front surface 20b of the printed circuit board 20 are connected to an electrolytic capacitor 60, thereby shortening the current path. This allows the motor control device 1 to be made more compact.

[0059] A first leg 43 is formed to protrude from a side surface 41c of the first main body 41, and a second leg 53 is formed to protrude from a side surface 51c of the second main body 51. These legs 43, 53 are connected (in contact) with a surface 20b of the printed circuit board 20 via protruding pieces 43a, 53a, respectively. Each of the main bodies 41, 51 is disposed so as to be perpendicular to the surface 20b of the printed circuit board 20. Therefore, the posture of each of the main bodies 41, 51 alone becomes unstable. In such a posture, each of the legs 43, 53 functions to prevent each of the main bodies 41, 52 from falling over. Therefore, the reliability of the motor control device 1 can be improved.

[0060] [Variations] Next, a modification of the motor control device 1 will be described with reference to FIG. Fig. 6 is a perspective view of the motor control device 1 according to the modified example with the case 10 removed. Fig. 6 corresponds to Fig. 3 described above. 6, a first tongue portion 44 may be integrally formed with the first main body portion 41 of the first busbar 31. A second tongue portion 54 may be integrally formed with the second main body portion 51 of the second busbar 32.

[0061] The first tongue portion 44 is disposed in the center in the Y direction of an edge 41d of the first body portion 41 opposite to the printed circuit board 20. The first tongue portion 44 is bent and extended from the edge 41d of the first body portion 41 toward the switching element 22. That is, the first tongue portion 44 extends in a direction perpendicular to the first body portion 41. In other words, the first tongue portion 44 extends in a direction parallel to the surface 20b of the printed circuit board 20.

[0062] The second tongue portion 54 is disposed in the center in the Y direction of an edge 51d of the second main body portion 51 on the opposite side to the printed circuit board 20. The second tongue portion 54 is bent and extended from the edge 51d of the second main body portion 51 toward the switching element 22. That is, the second tongue portion 54 extends in a direction perpendicular to the second main body portion 51. In other words, the second tongue portion 54 extends in a direction parallel to the surface 20b of the printed circuit board 20.

[0063] The second tongue portion 54 is disposed so as to overlap the first tongue portion 44. Here, the first bus bar 31 and the second bus bar 32 are disposed in a state in which the first main body portion 41 and the second main body portion 51 are slightly misaligned in the Y direction. For this reason, a portion of the first tongue portion 44 is exposed from the second tongue portion 54 when viewed from the Z direction.

[0064] With this configuration, when placing each bus bar 31, 32 on printed circuit board 20 in assembling motor control device 1, an industrial robot (not shown) or the like sucks and transports each bus bar 31, 32 by sucking each tongue portion 44, 54. When sucking, upper surfaces 44a, 54a of each tongue portion 44, 54, which are the surfaces opposite to printed circuit board 20, are sucked.

[0065] Here, each of the tongue portions 44, 54 is bent 90° relative to the corresponding main body portions 41, 52. Therefore, when each of the tongue portions 44, 54 is sucked and transported onto the printed circuit board 20, the main body portions 41, 51 are transported in a position where they are perpendicular to the surface 20b of the printed circuit board 20. In this position, the protruding pieces 43a, 53a of the legs 43, 53 are inserted into the printed circuit board 20 for connection. This completes the assembly of the bus bars 31, 32 to the printed circuit board 20. Therefore, according to the above-described modified example, the assembly workability of the motor control device 1 can be improved.

[0066] The present invention is not limited to the above-described embodiment, and includes various modifications to the above-described embodiment without departing from the spirit of the present invention. For example, in the above embodiment, the number of electrolytic capacitors 60 is eight, and the total number of pattern terminals 23, 24 and the number of each of the bus bar terminals 42, 52 correspond to the number of electrolytic capacitors 60. However, this is not limited to this, and the number of electrolytic capacitors 60 can be any number. The total number of pattern terminals 23, 24 and the number of each of the bus bar terminals 42, 52 can be determined accordingly.

[0067] In the above embodiment, the first leg 43 is bent and extended from the end 41b of the first body 41 on one side 20c of the printed circuit board 20 toward the switching element 22. The second leg 53 is bent and extended from the end 51b of the second body 51 on the other side 20d of the printed circuit board 20 toward the switching element 22. The protruding pieces 43a, 53a of the legs 43, 53 are connected to the surface 20b of the printed circuit board 20. However, this is not limited to the above, and each leg 43, 53 may protrude from the side of each body 41, 51 and may be in contact with the surface 20b of the printed circuit board 20. By configuring in this manner, each leg 43, 53 can function to prevent each bus bar 31, 32 from falling over.

[0068] In the above-described modified example, the first tongue portion 44 is bent and extended from the center in the Y direction of the edge 41d of the first main body portion 41 toward the switching element 22 side. The second tongue portion 54 is bent and extended from the center in the Y direction of the edge 51d of the second main body portion 51 toward the switching element 22 side. However, this is not limited to the above, and each tongue portion 44, 54 may extend from the edge 41d, 51d of each main body portion 41, 51. The tongue portions 44, 54 may not be bent and extended from each main body portion 41, 51. It is sufficient that each tongue portion 44, 54 can be transported by being gripped or sucked by an industrial robot (not shown).

[0069] In addition, within the scope of the invention, the components in the above-described embodiments may be replaced with well-known components, and the above-described modified examples may be combined as appropriate. [Explanation of symbols]

[0070] 1...motor control device, 10...case, 10a...outer surface, 10b...end, 12...heat dissipation fin, 12...fin, 20...printed circuit board (circuit board), 20a...one end, 20b...surface, 20c...side edge, 20d...side edge, 22...switching element (heat generating element), 23...first pattern terminal, 24...second pattern terminal, 30...bus bar, 31...first bus bar, 32...second bus bar, 41...first main body portion (main body portion), 41a...edge, 41b...end, 42...first bus bar terminal (bus bar terminal), 43...first leg portion, 43a...projecting piece, 45...first panel Turn connection portion, 46...first rising portion (rising portion), 47...first capacitor connection portion (connection portion), 48...recess, 51...second main body portion (main body portion), 51b...end portion, 52...second bus bar terminal (bus bar terminal), 53...second leg portion, 53a...projecting piece, 55...second pattern connection portion, 56...second rising portion (rising portion), 57...second capacitor connection portion (connection portion), 58...recess, 60...electrolytic capacitor (capacitor), 60a...end surface, 61...first lead terminal (lead terminal), 62...second lead terminal (lead terminal), D...distance, H...height, L...straight line,

Claims

1. A substrate having a heat generating element surface mounted thereon; a bus bar that is surface-mounted on the substrate and connected to the heat generating element; a capacitor disposed alongside the substrate along an extension direction of the substrate and electrically connected to the heat generating element via the bus bar; Equipped with The bus bar is A main body portion connected to the substrate; a bus bar terminal connected to the main body and to the capacitor; having The bus bar terminal is a rising portion rising from a surface of the substrate; a connection portion that is bent and extended from an end of the rising portion opposite to the substrate toward the capacitor and is connected to the capacitor; having A motor control device comprising:

2. A plurality of the capacitors are provided, Each of the capacitors has a lead terminal connected to the connection portion, and the lead terminals are arranged in one direction; the bus bar has a plurality of the bus bar terminals connected to a plurality of the capacitors, The connection portions are arranged in the same direction as the arrangement direction of the lead terminals.

2. The motor control device according to claim 1 .

3. the bus bars include a first bus bar and a second bus bar each connected to one of the capacitors, the main body portion includes a first main body portion provided on the first bus bar and a second main body portion provided on the second bus bar, the first body portion and the second body portion are disposed between the heat generating element and the capacitor and opposed to each other in an arrangement direction of the heat generating element and the capacitor.

3. The motor control device according to claim 1 or 2.

4. The main body portion has a tongue portion extending from an end portion of the main body portion opposite to the substrate.

2. The motor control device according to claim 1 .

5. The tongue portion extends in a direction parallel to the substrate.

5. The motor control device according to claim 4.

6. The main body has a leg portion protruding from a side surface of the main body and abutting against the substrate.

2. The motor control device according to claim 1 .

7. The legs are connected to the substrate.

7. The motor control device according to claim 6.

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