Motor control device

Abstract

To provide a motor control device including a filter cover portion, with a simple configuration while restraining an increase in the number of components and assembly man-hours.SOLUTION: A motor control device 1 includes: a printed circuit board 20; a terminal connection member 80 having an element connection portion 81 connected to a switching element 22 and also having a terminal portion 82 to which an external wire is detachably connected; and a case 10. The case 10 includes: a base member 11; a main cover 12 covering a portion where the printed circuit board 20 is provided, and attached to the base member 11 while the terminal portion 82 is projected in a first direction X; a filter 128 provided so as to cover a communication hole 125 formed in the main cover 12; and a sub-cover 13 detachably provided on the base member 11 so as to cover the terminal portion 82. The sub-cover 13 integrally has a filter cover portion 138 provided so as to cover the filter 128.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] Cases for housing electronic devices such as circuit boards are often provided with a communication hole (breathing hole) that connects the inside and outside of the case to suppress fluctuations in the internal pressure of the case due to temperature changes. In this case, a filter is provided in the communication hole to prevent rainwater and foreign objects from entering the case from the outside.

[0003] Patent Document 1 discloses a waterproof case having a bottom plate on which an electronic device is mounted and a top lid that covers the bottom plate. The waterproof case includes a ventilation hole that passes through the top lid, a filter that covers the ventilation hole, and a filter cover that is formed on the outer surface of the top lid and covers the filter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-5162 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, as disclosed in Patent Document 1, when a filter cover part that covers a filter is provided on a top lid having a communication hole, if the filter cover part is integrally formed with the top lid, the structure of the top lid becomes complicated. In contrast, if the filter cover part is to be detachably attached to the top lid, this leads to an increase in the number of parts and assembly steps. An object of the present invention is to provide a motor control device that has a filter cover portion with a simple configuration while suppressing an increase in the number of parts and assembly man-hours. [Means for solving the problem]

[0006] In order to solve the above problems, in a first aspect of the present invention, a motor control device comprises a substrate on which a switching element that drives a motor is mounted, a terminal connection member having an element connection portion connected to the switching element and a terminal portion to which external wiring is detachably connected, and extending in a first direction along a main surface of the substrate, and a case that accommodates the switching element, the substrate, and the terminal connection member, wherein the case comprises a base member having a first surface to which the substrate is fixed, a main cover that covers at least a portion of the first surface of the base member on which the substrate is provided and is attached to the base member with the terminal portion protruding in the first direction, an air-permeable filter that is provided to cover a communication hole formed in the main cover that connects the inside and outside of the case, and a sub-cover that is detachably provided on the base member to cover the terminal portion, and the sub-cover has an integral filter cover portion that is provided to cover the filter.

[0007] With this configuration, since the filter cover part is provided to cover the filter, it is possible to prevent the filter from being subjected to external forces such as high-pressure water or flying stones, and it is possible to prevent water and dust from entering the case and to allow gas to enter and exit due to pressure changes within the case without using a special filter that provides measures against the above-mentioned external forces. Furthermore, since the sub-cover has the filter cover part integrally therewith, the filter cover part that covers the filter is set by attaching the main cover and the sub-cover to the base member. Therefore, it is possible to provide a motor control device equipped with a filter cover part with a simple configuration while suppressing an increase in the number of parts and assembly man-hours.

[0008] A second aspect of the present invention is directed to the motor control device of the first aspect, wherein the main cover has an outer surface facing a first side in the thickness direction of the substrate and a bottom wall into which the communicating hole opens, and a recess in the outer surface opening to the first side in the thickness direction, and it is preferable that the filter is arranged within the recess so as to cover the communicating hole, and the filter cover part is arranged within the recess so as to face the bottom wall in the thickness direction across the filter.

[0009] With this configuration, the filter and the filter cover part are provided in the recess formed in the main cover, so that the filter cover part that covers the filter can be provided with a simple configuration. Also, by providing the filter cover part in the recess, the motor control device can be configured compactly in the plate thickness direction.

[0010] A third aspect of the present invention is a motor control device according to the first or second aspect, wherein the filter cover portion is spaced apart from the filter on a first side in the plate thickness direction, and when viewed from the plate thickness direction, a gap is formed between the filter cover portion and the recess.

[0011] With this configuration, the filter cover portion is spaced apart from the filter on the first side in the plate thickness direction, so that with a simple configuration, good ventilation is achieved between the inside and outside of the main cover through the filter, while the filter cover portion effectively prevents rainwater and foreign objects from the outside from reaching the filter. Effect of the Invention

[0012] According to one aspect of the present invention, it is possible to provide a motor control device having a filter cover portion with a simple configuration while suppressing an increase in the number of parts and assembly steps. [Brief description of the drawings]

[0013] [Figure 1] 1 is a perspective view showing a motor control device according to an embodiment of the present invention; [Diagram 2] 2 is a perspective view of the motor control device in FIG. 1, as seen from a different direction than in FIG. 1. [Diagram 3] 2 is a perspective view showing a state in which a main cover and a sub cover are removed from the motor control device of FIG. 1. [Figure 4] FIG. 2 is a cross-sectional view of the motor control device of FIG. [Diagram 5] FIG. 2 is a plan view of the motor control device of FIG. [Figure 6] 2 is a perspective view showing a state in which a sub-cover is removed from the motor control device of FIG. 1. [Figure 7] 4 is an enlarged cross-sectional view showing a contact portion between the main cover and the sub-cover. FIG. [Figure 8] 5 is a cross-sectional view taken along the line II in FIG. 4. [Figure 9] 4 is an enlarged cross-sectional view showing a filter and a filter cover of the motor control device. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a motor control device according to the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to this embodiment.

[0015] <Motor control device 1> Fig. 1 is a perspective view showing a motor control device 1 in an embodiment. Fig. 2 is a perspective view of the motor control device 1 in Fig. 1, seen from a different direction than in Fig. 1. Fig. 3 is a perspective view showing a state in which a main cover 12 and a sub-cover 13 have been removed from the motor control device 1 in Fig. 1. Fig. 4 is a cross-sectional view of the motor control device in Fig. 1. The motor control device 1 shown in Figures 1 to 4 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 in this embodiment is mounted on a vehicle such as a motorcycle, a motorized bicycle, or an automobile. The motor control device 1 has a case 10. As shown in Figures 3 and 4, the motor control device 1 has a printed circuit board (substrate) 20, a plurality of electrolytic capacitors 60, and a plurality of terminal connection members 80 within the case 10.

[0016] As shown in Figures 1, 2 and 4, the case 10 mainly includes a base member 11, a main cover 12 and a sub-cover 13. As shown in Figures 3 and 4, the base member 11 is formed in a box shape with one side open. The printed circuit board 20, a plurality of electrolytic capacitors 60 and a plurality of terminal connection members 80 are mounted on the base member 11.

[0017] <Printed circuit board 20> The printed circuit board 20 is plate-shaped, and has a surface (main surface) 20a on which a plurality of switching elements 22 are mounted. The printed circuit board 20 is formed in a rectangular shape when viewed from a thickness direction Z of the printed circuit board 20 that is perpendicular to the surface 20a. The printed circuit board 20 is fixed to a first surface 11f of the base member 11. In the following description, a direction perpendicular to the plate thickness direction Z and along the surface 20a of the printed circuit board 20 is defined as a first direction X, and a direction perpendicular to the plate thickness direction Z and the first direction X is defined as a second direction Y.

[0018] The printed circuit board 20 is a PWB (Printed Wiring Board). The ON / OFF operation of the multiple 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.

[0019] A plurality of first pattern terminals (not shown) and a plurality of second pattern terminals (not shown) are provided on the front surface 20a of the printed circuit board 20 on one side X1 in the first direction X with respect to the plurality of switching elements 22. The first pattern terminal 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 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.

[0020] The printed circuit board 20 is provided with a bus bar 30 on one side X1 in the first direction X with respect to the multiple switching elements 22. The bus bar 30 is connected to the multiple first pattern terminals and the multiple second pattern terminals of the printed circuit board 20. The bus bar 30 is mounted on the front surface 20a of the printed circuit board 20 by being connected to the multiple first pattern terminals and the multiple second pattern terminals. The bus bar 30 electrically connects the multiple electrolytic capacitors 60 and the multiple switching elements 22.

[0021] The bus bar 30 includes a first bus bar 31 and a second bus bar 32. Each of the first bus bar 31 and the second bus bar 32 is in the shape of a plate extending in the second direction Y and is made of a conductive material. The first bus bar 31 is electrically connected to the positive electrode of the switching element 22 via a first pattern terminal and a wiring pattern (not shown). The second bus bar 32 is electrically connected to the negative electrode of the switching element 22 via a second pattern terminal and a wiring pattern (not shown).

[0022] <Electrolytic capacitor 60> The electrolytic capacitors 60 are disposed on one side X1 in the first direction X with respect to the printed circuit board 20. The electrolytic capacitors 60 are accommodated in an accommodating recess 11z formed in the base member 11. Each electrolytic capacitor 60 is formed, for example, in a cylindrical shape. Each electrolytic capacitor 60 is arranged with its axial direction aligned with the first direction X. The electrolytic capacitors 60 are arranged in parallel in the second direction Y. In this embodiment, for example, eight electrolytic capacitors 60 are arranged in parallel in the second direction Y.

[0023] 3, each electrolytic capacitor 60 has a first lead terminal 61 and a second lead terminal 62. The first lead terminal 61 and the second lead terminal 62 are provided at an interval in the second direction Y. The first lead terminal 61 is connected to the first bus bar 31. The second lead terminal 62 is connected to the second bus bar 32. In this manner, the electrolytic capacitor 60 is electrically connected to the switching element 22 via the bus bar 30. The electrolytic capacitor 60 suppresses 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.

[0024] <Terminal connection member 80> 3 and 4, the terminal connection member 80 is provided on the other side X2 in the first direction X with respect to the multiple switching elements 22. The multiple terminal connection members 80 are provided in parallel in the second direction Y. In the present embodiment, five terminal connection members 80 are provided lined up in the second direction Y.

[0025] Each terminal connection member 80 extends in the first direction X. Each terminal connection member 80 has an element connection portion 81 on one side X1 in the first direction X. As shown in FIG. 3, among the five terminal connection members 80, the element connection portions 81 of three terminal connection members 80A arranged in the center in the second direction Y are fixed to the printed circuit board 20 by screws 88 and connected to the multiple switching elements 22 via a wiring pattern (not shown) formed on the front surface 20a of the printed circuit board 20. Among the five terminal connection members 80, the element connection portions 81 of two terminal connection members 80B provided at both ends in the second direction Y are fixed to the printed circuit board 20 by screws 88 and connected to a wiring pattern (not shown) formed on the front surface 20a of the printed circuit board 20.

[0026] As shown in FIG. 3 and FIG. 4, each terminal connection member 80 has a terminal portion 82 on the other side X2 in the first direction X. The terminal portion 82 of each terminal connection member 80 is fixed to a spacer 15 attached to the first surface 11f of the base member 11. The spacer 15 extends in the second direction Y when viewed from the plate thickness direction Z. The spacer 15 has a predetermined thickness in the plate thickness direction Z. The spacer 15 is formed with an accommodation groove 15m that extends in the first direction X and accommodates the terminal portion 82. The accommodation groove 15m is recessed from the surface 15f of the spacer 15 to the second side Z2 in the plate thickness direction Z. The surface 15f of the spacer 15 and the surface 82f of the terminal portion 82 accommodated in the accommodation groove 15m are along the same plane that intersects with the plate thickness direction Z.

[0027] The spacer 15 has, at both ends in the second direction Y, locked portions 15s protruding toward the second side Z2 in the plate thickness direction Z. The spacer 15 is so-called snap-fitted by locking the locked portions 15s to locking claws 11t formed on the base member 11.

[0028] An external wiring (not shown) is detachably connected to the terminal portion 82 by a bolt 83 and a nut (not shown). As shown in Fig. 4, the spacer 15 is formed with a bolt accommodating hole 15h that accommodates a head 83a of the bolt 83. A shaft portion 83b of the bolt 83 penetrates the terminal portion 82 and protrudes toward a first side Z1 in the plate thickness direction Z relative to the terminal portion 82.

[0029] Here, among the five terminal connection members 80, the terminal portions 82 of the three terminal connection members 80A arranged in the center in the second direction Y are connected to external wiring for supplying U-phase, V-phase, and W-phase drive currents to a motor (not shown). Among the five terminal connection members 80, the terminal portions 82 of the two terminal connection members 80B arranged at both ends in the second direction Y are connected to external wiring for connection to a power source and ground.

[0030] <Base member 11> 1, 2, and 4, the base member 11 is provided with a plurality of heat dissipation fins 14 in a portion in which the printed circuit board 20 and the plurality of electrolytic capacitors 60 are housed. The plurality of fins 14 are provided at intervals in the second direction Y. Each fin 14 protrudes from the base member 11 to the second side Z2 in the plate thickness direction Z and extends in the first direction X. The plurality of fins 14 dissipate heat generated by the plurality of electrolytic capacitors 60, the bus bar 30 mounted on the printed circuit board 20, the plurality of switching elements 22, the plurality of terminal connection members 80, etc., to the outside of the base member 11.

[0031] FIG. 5 is a plan view of the motor control device 1 of FIG. 1, 2, and 5, the base member 11 is provided with stays 16 protruding on both sides in the second direction Y. The base member 11 (the motor control device 1) is fixed to a vehicle body equipped with a motor (not shown) by bolts (not shown) inserted through the stays 16.

[0032] <Main cover 12> FIG. 6 is a perspective view showing a state in which the sub-cover 13 is removed from the motor control device 1 of FIG. 4 and 6, the main cover 12 is provided to cover the multiple electrolytic capacitors 60 housed in the base member 11 and the printed circuit board 20. As shown in Figures 1, 2 and 5, the main cover 12 integrally has a plate-like portion 121 and a peripheral wall portion 122, and is formed in a box shape that opens to a second side Z2 in the plate thickness direction Z.

[0033] The plate-shaped portion 121 extends along a plane intersecting with the plate thickness direction Z. The plate-shaped portion 121 is formed in a rectangular shape when viewed from the plate thickness direction Z. The dimension of the plate-shaped portion 121 in the Y direction is equal to that of the base member 11. The dimension of the plate-shaped portion 121 in the X direction is smaller than that of the base member 11. Therefore, when viewed from the plate thickness direction Z, the base member 11 protrudes toward the other side X2 in the first direction X relative to the plate-shaped portion 121.

[0034] The peripheral wall portion 122 rises from the four sides of the plate-shaped portion 121 toward the second side Z2 in the plate thickness direction Z. Here, in the peripheral wall portion 122, the wall portion 122a provided on one side X1 in the first direction X and the wall portions 122b, 122c provided on both sides in the second direction Y are provided at positions overlapping with the three side surfaces 11a, 11b, 11c along the outer periphery of the base member 11, respectively, as viewed from the plate thickness direction Z. As shown in FIG. 4 and FIG. 6, in the peripheral wall portion 122, the wall portion 122d provided on the other side X2 in the first direction X is provided at a position shifted toward the one side X1 in the first direction X with respect to the remaining one side surface 11d along the outer periphery of the base member 11. As a result, the terminal portions 82 of the multiple terminal connection members 80 protrude from the wall portion 122d toward the other side X2 in the first direction X.

[0035] 1, 2, and 5, the peripheral wall portion 122 has a flange portion 123 formed at a tip portion of the second side Z2 in the plate thickness direction Z, the flange portion 123 extending outward from the peripheral wall portion 122. The flange portions 123a, 123b, and 123c of the walls 122a, 122b, and 122c are in close contact with the outer peripheral edge portion of the first surface 11f of the base member 11 via a sealant such as a liquid gasket. In this case, the space surrounded by the base member 11 and the main cover 12 in the case 10 constitutes the first space 100A.

[0036] As shown in FIG. 6, a flange portion 123d continuous with the wall portion 122d is in close contact with a surface 15f of the spacer 15 and the surface of the terminal portion 82 via a sealant such as a liquid gasket. In this manner, the multiple electrolytic capacitors 60 and the printed circuit board 20 are housed in a space sealed by the base member 11, the spacer 15, and the main cover 12.

[0037] 1 and 2, the main cover 12 has, at both ends in the second direction Y, locked portions 12s that protrude toward the second side Z2 in the plate thickness direction Z. The main cover 12 is so-called snap-fitted by locking claws 11k formed on the side surfaces 11b and 11c of the base member 11 with the locked portions 12s.

[0038] <Sub-cover 13> As shown in FIG. 2 and FIG. 4, the sub-cover 13 is provided on the other side X2 in the first direction X with respect to the main cover 12. The sub-cover 13 is formed in a box shape that opens to the second side Z2 in the plate thickness direction Z and one side X1 in the first direction. The sub-cover 13 is provided so as to cover the terminal portions 82 of the terminal connection members 80 that protrude from the wall portion 122d of the main cover 12 to the other side X2 in the first direction X. The sub-cover 13 integrally includes a base portion 131 and a side wall portion 132. The base portion 131 extends along a plane that intersects with the plate thickness direction Z. The base portion 131 is formed in a rectangular shape when viewed from the plate thickness direction Z. The base portion 131 is provided on the same plane as the plate-shaped portion 121 of the main cover 12.

[0039] The side wall portion 132 rises from the outer circumferential edge of the base portion 131 toward a second side Z2 in the plate thickness direction Z. The side wall portion 132 has a wall portion 132a provided on the other side X2 in the first direction X, and walls 132b, 132c provided on both sides in the second direction Y. Such a sub-cover 13 is open toward the second side Z2 in the plate thickness direction Z and one side X1 in the first direction X by the base portion 131 and the side wall portion 132.

[0040] The sub-cover 13 has a plurality of protruding portions 134 that protrude toward the other side X2 in the first direction X on the second side Z2 in the plate thickness direction Z with respect to the wall portion 132a. The protruding portions 134 are arranged at intervals in the second direction Y. As shown in FIG. 4, the protruding portions 134 have wiring insertion holes 134h through which external wiring is inserted on the surface facing the second side Z2 in the plate thickness direction Z. The ends of the external wiring are drawn into the sub-cover 13 through the wiring insertion holes 134h, and then connected to the terminal portions 82 in the sub-cover 13, respectively. As shown in FIG. 5, the sub-cover 13 is detachably fixed to the side surface 11d of the base member 11 by screws 135.

[0041] FIG. 7 is an enlarged cross-sectional view showing a contact portion between the main cover 12 and the sub-cover 13. As shown in FIG. 5 and 7, an edge 131s on one side X1 in the first direction X of the base 131 of the sub-cover 13 contacts the wall portion 122d of the main cover 12. Specifically, the edge 131s abuts against the wall portion 122d from the other side X2 in the first direction X. However, the edge 131s may overlap the wall portion 122d or the plate-shaped portion 121 from the first side Z1 in the plate thickness direction Z as long as the main cover 12 and the sub-cover 13 are configured to be in close contact with each other.

[0042] In the case 10, a space surrounded by the base member 11 and the sub-cover 13 constitutes the second space 100B. The first space 100A and the second space 100B are partitioned by a wall portion 122d.

[0043] <Filter 128> Fig. 8 is a cross-sectional view taken along the line II in Fig. 4. Fig. 9 is an enlarged cross-sectional view showing the filter 128 and the filter cover portion 138 of the motor control device 1. As shown in Figures 4, 6, 8 and 9, a filter 128 is provided on the main cover 12. A communication hole 125 is formed in the end of the plate-shaped portion 121 on the other side X2 in the first direction X. The communication hole 125 is formed in the center of the plate-shaped portion 121 in the second direction Y. The communication hole 125 is formed in a bottom wall 126b of a recess 126 formed in the plate-shaped portion 121.

[0044] The recess 126 is recessed from an outer surface 121f facing a first side Z1 in the plate thickness direction Z in the plate-shaped portion 121 to a second side Z2 in the plate thickness direction Z. The recess 126 is formed, for example, in a U-shape when viewed from the plate thickness direction Z. The recess 126 has a bottom wall 126b and a peripheral wall 126s. The bottom wall 126b is provided on the second side Z2 in the plate thickness direction Z with respect to the plate-shaped portion 121. The bottom wall 126b extends along a plane intersecting the plate thickness direction Z. An end of the bottom wall 126b on the other side X2 in the first direction X is connected to the wall portion 122d. The peripheral wall 126s extends in a U-shape along the outer peripheral edge of the bottom wall 126b when viewed from the plate thickness direction Z. The peripheral wall 126s connects the outer peripheral edge of the bottom wall 126b and the plate-shaped portion 121. The recess 126 opens onto the outer surface 121f and onto a surface of the wall portion 122d facing the other side X2 in the first direction X.

[0045] The communication hole 125 penetrates the bottom wall 126b of the recess 126 in the plate thickness direction Z. As a result, the communication hole 125 communicates the inside and outside of the case 10 (first space 100A). The peripheral wall 126s also has a step portion 126d at an end of a first side Z1 in the plate thickness direction Z, in which the inner diameter dimension of the recess 126 in a direction intersecting the plate thickness direction Z of the recess 126 is enlarged with respect to an end of a second side Z2 in the plate thickness direction Z. The inner peripheral surface of the step portion 126d has a vertical surface 126g extending from an opening edge of the first side Z1 in the plate thickness direction Z of the recess 126 to the second side Z2 in the plate thickness direction Z, and a step surface 126f extending from an end of the vertical surface 126g on the second side Z2 in the plate thickness direction Z toward the inside of the recess 126.

[0046] The filter 128 is provided in the recess 126 so as to cover the communication hole 125. The filter 128 is formed of a material that allows air to pass through but prevents the passage of rainwater and foreign matter. In this embodiment, the communication hole 125 and the filter 128 are formed, for example, in a circular shape when viewed from the plate thickness direction Z. The filter 128 may be bonded or welded to a portion of the bottom wall 126b that is located around the communication hole 125, or may simply be placed on the bottom wall 126b.

[0047] As shown in Figs. 1, 2, 4, 5, and 9, the sub-cover 13 is provided with a filter cover portion 138. The filter cover portion 138 is integrally formed at an end portion of the base portion 131 on one side X1 in the first direction X. The filter cover portion 138 is provided at a central portion in the second direction Y. The filter cover portion 138 is provided so as to protrude from the base portion 131 to one side X1 in the first direction X. The filter cover portion 138 is provided on the same plane as the base portion 131. The filter cover portion 138 is formed, for example, in a substantially U-shape when viewed from the plate thickness direction Z. In the illustrated example, the plate thickness of the filter cover portion 138 gradually becomes thinner toward the one side X1 in the first direction X.

[0048] 4, 8 and 9, the filter cover part 138 is provided in the recess 126 so as to face the bottom wall 126b in the plate thickness direction Z with the filter 128 in between. The filter cover part 138 is spaced from the filter 128 on one side X1 in the plate thickness direction Z.

[0049] A small gap S is provided between the filter cover part 138 and the recess 126 when viewed from the plate thickness direction Z. The gap S is set to a dimension that allows gas to pass through but does not allow liquid or dust to pass through easily. More specifically, as shown in FIG. 9, when viewed from the second direction Y, a tip part 138s on one side X1 in the first direction X of the outer periphery of the filter cover part 138 is disposed within the step part 126d (when viewed from the plate thickness direction Z, it overlaps with the step part 126d). Within the step part 126d, the tip part 138s is spaced apart from the hanging surface 126g in the first direction X. Within the step part 126d, the tip part 138s is spaced apart from the step surface 126f on the first side Z1 in the plate thickness direction Z.

[0050] As shown in FIG. 8, the ends 138e on both sides of the outer periphery of the filter cover portion 138 in the second direction Y are disposed in the step portion 126d (overlapping the step portion 126d when viewed from the plate thickness direction Z). The ends 138e are spaced apart from the hanging surface 126g in the first direction X in the step portion 126. The ends 138e are spaced apart from the step surface 126f on the first side Z1 in the plate thickness direction Z in the step portion 126d. Therefore, the gap S extends in an L-shape in cross section all around the circumference between the outer periphery of the filter cover portion 138 and the inner periphery of the peripheral wall 126s. For this reason, it is difficult for rainwater or foreign matter to enter from the outside through the gap S. Moreover, since the outer peripheral edge (tip portion 138s and end portion 138e) of the filter cover portion 138 faces the step surface 126f in the plate thickness direction Z, when the filter cover portion 138 is deformed toward the second side Z2 in the plate thickness direction Z due to an external force or the like, the outer peripheral edge of the filter cover portion 138 abuts against the step surface 126f. This prevents the filter cover portion 138 from being excessively deformed. However, it is sufficient that at least a partial gap S is provided between the outer peripheral surface of the filter cover portion 138 and the inner peripheral surface of the peripheral wall 126s.

[0051] By providing such a filter cover portion 138, the first space 100A covered by the main cover 12 communicates with the outside through the communication hole 125, the filter 128, the space between the filter 128 and the filter cover portion 138, and the gap S.

[0052] In this manner, in this embodiment, the filter 128 is provided so as to cover the communication hole 125 formed in the main cover 12 , and the filter cover portion 138 covering the filter 128 is provided on the sub-cover 13 . According to this configuration, since the filter cover portion 138 is provided so as to cover the filter 128, it is possible to prevent the filter 128 from being subjected to external forces such as high-pressure water or flying stones, and it is possible to prevent the intrusion of water and dust into the case 10 and allow gas to flow in and out due to pressure changes within the case 10 without using a special filter that provides measures against the above-mentioned external forces. Furthermore, since the sub-cover 13 is integral with the filter cover portion 138, the filter cover portion 138 that covers the filter 128 is set by attaching the main cover 12 and the sub-cover 13 to the base member 11. Therefore, it is possible to provide a motor control device 1 that is equipped with the filter cover portion 138 in a simple configuration while suppressing an increase in the number of parts and assembly man-hours. In addition, since the motor control device 1 can be provided with a simple configuration while minimizing increases in the number of parts and assembly labor, it will be possible to contribute to Goal 7 of the Sustainable Development Goals (SDGs) led by the United Nations, "Ensure access to affordable, reliable, sustainable and modern energy for all," and Goal 9, "Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation."

[0053] In this embodiment, a filter 128 and a filter cover portion 138 are provided in a recess 126 formed in the main cover 12 . This configuration makes it possible to provide, with a simple structure, the filter cover portion 138 that covers the filter 128. Furthermore, by providing the filter cover portion 138 inside the recess 126, the motor control device 1 can be configured compactly in the plate thickness direction Z.

[0054] In this embodiment, the filter cover portion 138 is provided at a distance from the filter 128 on the first side Z1 in the plate thickness direction Z, and when viewed from the plate thickness direction Z, a gap S is formed between the filter cover portion 138 and the recess 126. With this simple configuration, it is possible to ensure good ventilation between the inside and outside of the main cover 12 through the filter 128, while the filter cover portion 138 effectively prevents rainwater and foreign matter from the outside from reaching the filter 128.

[0055] 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-described embodiment, the case 10 is provided with a plurality of electrolytic capacitors 60, a printed circuit board 20 having a plurality of switching elements 22 mounted thereon, and a terminal connecting member 80, but the number, positions, etc. of these components can be changed as appropriate.

[0056] In the above embodiment, the communication hole 125 opens in the bottom wall 126b of the recess 126, but the present invention is not limited to this configuration. The communication hole 125 may be formed in the plate-like portion 121 or the peripheral wall portion 122, for example. In the above embodiment, the configuration in which the communication hole 125 is provided at only one location has been described, but the present invention is not limited to this configuration. The communication hole 125 may be provided at multiple locations. In the above embodiment, the filter cover portion 138 is provided inside the recess 126, but the present invention is not limited to this configuration. The filter cover portion 138 may be provided in a state where it bulges out from the main cover 12.

[0057] 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]

[0058] 1...motor control device 10...case 11...base member 11a to 11d...side surface 11f...first surface 11k, 11t...locking claw 11z...accommodating recess 12...main cover 12s...locked portion 13...sub-cover 14...fin 15...spacer 15f...surface 15h...bolt accommodating hole 15m...accommodating groove 15s...locked portion 16...stay 20...printed circuit board (circuit board) 20a...surface 22...switching element 30...bus bar 31...first bus bar 32...second bus bar 60...electrolytic capacitor 61...first lead terminal 62...second lead terminal 80, 80A, 80B...terminal connecting member 81...element connecting portion 82...terminal portion 82f...surface 83...bolt 83a...head 83b...shaft portion 88...screw 100A...first space 100B...second space 121...plate-like portion 121f...outer surface 122...circumferential wall portion 122a-122d...wall portion 123, 123a-123d...flange portion 125...communication hole 126...recess 126b...bottom wall 126d...step portion 126f...surface 126g...surface 126s...circumferential wall 128...filter 131...base portion 131s...edge 132...side wall portion 132a-132c...wall portion 134...projection portion 134h...wiring insertion hole 135...screw 138...filter cover portion 138e...end portion 138s...tip portion S...gap X...first direction X1...one side X2...other side Y...second direction Z...plate thickness direction Z1...first side Z2…Second side

Claims

1. A substrate on which switching elements for driving a motor are mounted; a terminal connection member having an element connection portion connected to the switching element and a terminal portion to which an external wiring is detachably connected, the terminal connection member extending in a first direction along a main surface of the substrate; a case that accommodates the switching element, the substrate, and the terminal connection member, The case is a base member having a first surface to which the substrate is fixed; a main cover that covers at least a portion of the first surface of the base member where the substrate is provided and is attached to the base member in a state in which the terminal portion protrudes in the first direction; a filter that is provided to cover a communication hole that is formed in the main cover and that communicates between the inside and the outside of the case and that allows air to pass through; a sub-cover detachably provided on the base member so as to cover the terminal portion, The sub-cover has an integral filter cover portion provided to cover the filter. A motor control device comprising:

2. The main cover is An outer surface facing a first side in a thickness direction of the substrate; The communication hole has a bottom wall through which the communication hole opens, and a recess is provided on the outer surface, the recess opening to a first side in the plate thickness direction, the filter is provided in the recess so as to cover the communication hole, The filter cover portion is provided in the recess so as to face the bottom wall in the plate thickness direction with the filter therebetween.

2. The motor control device according to claim 1 .

3. The filter cover portion is provided on a first side in the plate thickness direction away from the filter, and a gap is formed between the filter cover portion and the recess when viewed from the plate thickness direction.

3. The motor control device according to claim 2 .

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