Motor control device

Abstract

The present application provides a cheap motor control device capable of efficiently cooling a plurality of heat-generating bodies housed inside. As shown in (a) of Fig. 3, in the first air passage on the positive side of the x direction of the frame (10), the cooling air flows between the cooling fins (11) toward the positive side of the z direction as shown by arrow A3 as described above. On the other hand, as shown in (b) of Fig. 3 as viewed from the negative side of the x direction, in the second air passage on the negative side of the x direction, the cooling air is deflected toward the negative side of the y direction in the direction of travel as shown by arrow A4 due to the presence of the air guide portion (13). Therefore, the first heat-generating body is cooled by the cooling air. Since the first heat-generating body is present on the positive side of the y direction and the positive side of the z direction of the second substrate, a control IC or the like mounted on the second substrate is not exposed to the cooling air which becomes high temperature.

Description

Technical Field

[0001] This invention relates to the structure of a motor control device that uses a cooling fan. Background Technology

[0002] In motor control devices, power semiconductor components or resistors carrying large currents become heat-generating elements during operation. On the other hand, components with low heat resistance, such as capacitors or logic ICs, are also used. Furthermore, to miniaturize the motor control device, these components need to be arranged in high density (close proximity). Therefore, a structure is adopted in which a cooling fan is installed on the frame of the motor control device, and the cooling air generated by this fan efficiently cools these heat-generating elements without adversely affecting components other than the heat-generating elements. This is particularly important when multiple such heat-generating elements are located in different places, requiring efficient cooling of all of them.

[0003] In the technology described in Patent Document 1, heating elements are mounted on a frame, and a cover is installed on the frame to form an integral motor control device. At this time, many large cooling fins are formed on the frame side, and cooling air generated by a cooling fan flows between these fins. Furthermore, a guide plate is formed on the cover side to direct the cooling air in a direction different from the direction of flow between the cooling fins. With the cover installed, by combining the cooling fins with the guide plate, the cooling air also flows in a direction different from the direction between the cooling fins. Therefore, many heating elements located in different positions can be cooled efficiently.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2019-110220 Summary of the Invention

[0007] In the technology described in Patent Document 1, the structure combining cooling fins and air guides becomes large and complex. Therefore, when other large components (such as resistors used in regenerative resistors or dynamic brakes for emergency stops) are installed in the motor control device, such a cooling structure is difficult to apply, or even when such a cooling structure is implemented, it is sometimes impossible to install such large components.

[0008] In addition, the manufacturing cost of the frame or cover increases due to the addition of such complex cooling fins on the frame or cover.

[0009] Therefore, there is a need for an inexpensive motor control device that can efficiently cool multiple internally housed heating elements.

[0010] The present invention was made in view of the following situation, and its object is to provide an inexpensive motor control device that can efficiently cool multiple heating elements housed inside.

[0011] The motor control device of the present invention cools a heat-generating element that is part of an installed component by causing cooling air to flow inside. The motor control device includes: a cooling fan that generates cooling air from one end side to the other end side along a first direction; and a frame that extends along the first direction and a second direction perpendicular to the first direction, with the component fixed at multiple locations along the second direction, and the cooling fan fixed at one end side and one side in the second direction. The other end side of the cooling fan in the frame has a planar airflow separation portion that intersects a third direction perpendicular to the first direction and the second direction. At a position downstream of the cooling airflow from the airflow separation portion, the direction of the cooling airflow is different on the side and the other side in the third direction as viewed from the frame.

[0012] In this structure, the cooling airflow from a single cooling fan branches into two (a first airflow and a second airflow) on both sides of the frame via an airflow separator in a third direction (perpendicular to the direction from which the cooling airflow originates). Thus, the flow direction of the cooling air in each airflow is set differently, enabling efficient cooling of different heat-generating components using the cooling airflow flowing in each airflow.

[0013] Alternatively, the cooling fan cover, which is provided with the cooling air outlet (i.e., the cooling air exhaust outlet) on the other end side of the cooling fan, may be abutted against the airflow separation part.

[0014] Based on this structure, the cooling air path is separated in a particularly rigorous manner by the air path separation section. Therefore, it is especially efficient to cool each heat-generating element.

[0015] Alternatively, multiple cooling fins extending along the first direction may be formed parallel to each other on the frame on the third-direction side of the frame, on the other end side of the cooling fan.

[0016] According to this structure, since cooling air can flow between the cooling fins through the air passage on one side of the third direction (first air passage), the cooling efficiency of the area (heat dissipation part) where the cooling fins are formed in the frame can be particularly improved.

[0017] Alternatively, an air guide portion may be formed on the other side of the third direction of the frame, the air guide portion having a surface that deflects the cooling air after passing through the airflow separation portion to the other side in the second direction.

[0018] According to this structure, the flow of cooling air in the first and second air paths formed by the air path separation section is set differently. In particular, on the other side (second air path) in the third direction, the flow direction of the cooling air is deflected away from the heat dissipation part by the air guide. As a result, the heat-generating element in the downstream part away from the heat dissipation part can be cooled.

[0019] Alternatively, the air guide portion may be formed as a stepped portion that makes the surface of the third-facing side of the frame protrude further to that other side than the airflow separation portion.

[0020] Within the frame, the airflow guide can be easily formed into such a stepped section. Furthermore, with this structure, the heat dissipation section can be positioned further to the other side in a third-direction upward direction, thus allowing the cooling fins to be formed higher and improving the cooling efficiency of the heat dissipation section.

[0021] Alternatively, a first substrate equipped with a control IC (integrated circuit) for motor control may be fixed to the frame at a position on the other side in the second direction than the cooling fan.

[0022] In this structure, the control IC and cooling fan or adjacent heat dissipation part, which are objects protected from the heat emitted from the heat source, are set off from the ground.

[0023] Alternatively, a second substrate, which is equipped with a first heating element, may be fixed to the frame relative to the first substrate at a position on the other side of the third-direction direction, with the first heating element protruding from the other end of the second substrate and from the side of the second direction towards the side of the third-direction direction. A notch is provided on the first substrate that exposes the first heating element when viewed from the side of the third-direction direction.

[0024] In this structure, a large smooth capacitor or similar component that requires cooling when forming a rectifier circuit on the second substrate is used as the first heat source. According to this structure, the first heat source can be efficiently cooled using cooling air flowing in the second airflow path.

[0025] Alternatively, a second heating element, serving as the heating element, may be fixed to the third-direction opposite side of the region in the frame where the cooling fins are formed.

[0026] Alternatively, a third heating element, which serves as the heating element, can be fixed to the cooling fins.

[0027] With these structures, the second and third heating elements are fixed to the heat dissipation section with cooling fins and cooled. At this time, a thin-film heating element (switching element) can be used as the second heating element, and a resistor such as a regenerative resistor can be used as the third heating element, and they can be cooled efficiently in the heat dissipation section.

[0028] Alternatively, it may have a cover component that covers the frame from the third side upwards on one side and the other side respectively when the cooling air is flowing.

[0029] The structure formed by combining these cover components and the frame enables efficient cooling of the heating element as described above, and also improves assemblability and maintainability.

[0030] (Invention Effects)

[0031] According to the present invention, an inexpensive motor control device can be obtained that efficiently cools multiple heating elements housed inside. Attached Figure Description

[0032] Figure 1 This is a perspective view of the motor control device as described in the implementation method.

[0033] Figure 2 This is an exploded perspective view of the motor control device according to the embodiment.

[0034] Figure 3 This is a plan view of the frame used in the motor control device of the embodiment.

[0035] Figure 4 This is a perspective view of the frame used in the motor control device of the embodiment.

[0036] Figure 5 This is a perspective view of the frame used in the motor control device of the embodiment, with the components installed.

[0037] Figure 6 Is Figure 1 A cross-sectional view perpendicular to the second direction (y direction) of the frame used in the motor control device, showing the portion (a) with the airflow separation part and the portion (b) without the airflow separation part. Detailed Implementation

[0038] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 This is a perspective view showing the overall structure of the motor control device 1 according to this embodiment. Figure 2 It is its exploded three-dimensional diagram. Figure 1 The method is the same as that of the motor control device 1 described in Patent Document 1. Here, the x-axis, y-axis, and z-axis are as follows: Figure 1The definition shown is the same in subsequent diagrams. Additionally, as shown... Figure 2 As shown, the motor control device 1 is configured such that a first cover component 20 is mounted from the positive side of the x-direction in the figure, a second cover component 30 is mounted from the negative side of the x-direction in the figure, and a third cover component 40 is mounted from the negative side of the y-direction in the figure, respectively, relative to the frame 10. In reality, various components (capacitors, resistors, switching elements, etc.) are fixed directly to the frame 10 or via a substrate, but descriptions of components other than the cooling fan 50 and the first substrate 71, which will be described later, are omitted. Additionally, a locking structure (hook or opening) for mounting the first cover component 20, the second cover component 30, and the third cover component 40 onto the frame 10 is appropriately formed, but these are the same as in Patent Document 1 and are not essential to the present invention, therefore descriptions are omitted. Thus, by mounting the first cover component 20, the second cover component 30, and the third cover component 40 onto the frame 10 where the components are fixed, the motor control device 1 can be formed, thereby improving the maintainability of the motor control device 1.

[0039] Furthermore, a cooling fan 50 is installed on the negative side (one end) in the z-direction (first direction) and the positive side (one side) in the y-direction (second direction) of the frame 10. The cooling fan 50 blows cooling air from here towards the positive side (the other end) in the z-direction (first direction). Thus, the components that become heat sources, primarily those fixed to the side of the frame 10, are cooled by this cooling air. As described below, the flow of this cooling air is determined by the structure of the frame 10.

[0040] Figure 3 The views shown are of the frame 10 viewed from the positive side (a) and the negative side (b) in the x-direction, without any components or substrates installed. Figure 4 This is a perspective view taken from the positive x-direction and positive z-direction (a) and from the negative x-direction and negative z-direction (b). As shown, the frame 10 extends along the z-direction (first direction) and the y-direction (second direction). Components fixed relative to the frame 10 (including heating elements) are fixed directly or via a substrate, particularly at multiple locations along the y-direction.

[0041] As described above, since a cooling fan 50 is mounted on the frame 10, a cooling fan housing portion 10A for housing the cooling fan 50 is provided at the end side on the positive side in the y-direction and the negative side in the z-direction. The overall shape of the cooling fan 50 is a roughly rectangular shape with each side parallel to the x, y, and z axes. As described above, the cooling air flows towards its positive side in the z-direction. The cooling fan 50 is fixed to the frame 10 by screws or the like. In addition, a substrate housing portion 10C is provided on the negative side in the y-direction of the frame 10. This substrate housing portion 10C is a large hollow portion for housing the substrates (first substrate 71 and second substrate 72, described later). These substrates are also fixed to the frame 10 by small screws or the like.

[0042] Furthermore, on the z-direction positive side of the cooling fan housing 10A (cooling fan 50) on the x-direction positive side of the frame 10, six cooling fins 11 are formed parallel to each other, protruding towards the x-direction positive side and extending along the z-direction. Therefore, the frame 10 in this part is efficiently cooled by the cooling air flowing towards the z-direction positive side between the cooling fins 11. Thus, the area in the frame 10 where the cooling fins 11 are formed becomes a heat dissipation section 10B where heat is dissipated particularly efficiently by the cooling air.

[0043] In this motor control device 1, a control circuit for driving a motor (servo motor) is formed. This control circuit consists of a control IC (integrated circuit), such as a CPU, which controls the motor according to control commands input from an external source, and an inverter circuit, a rectifier circuit, etc., controlled by this control. In the inverter circuit, switching elements (such as IGBTs), capacitors, and resistive elements, etc., that are controlled to be turned on / off by the control IC, are used. Additionally, resistors for regenerative braking or dynamic brakes for emergency stops can also be used. The way these components are fixed relative to the frame 10 is the same as in the motor control device described in Patent Document 1. Figure 5 This is a three-dimensional view of the state of the frame 10, which is fixed as seen from the positive (a) and negative (b) sides of the x-direction.

[0044] Among these components, those that become heat sources due to the large current flowing through them during operation, or that require cooling during operation, include large capacitors (first heat source 61) used as smoothing capacitors in rectifier circuits, switching elements (second heat source 62), and resistors such as regenerative resistors (third heat source 63). Other components besides these heat sources include control ICs and small capacitors used in inverter circuits, which are required to be inefficient at transferring heat generated by the aforementioned heat sources.

[0045] exist Figure 5 In (a), a first substrate 71, which houses a control IC and the like, is positioned with a large area further away from the negative side in the y-direction than the heat dissipation section 10B of the frame 10. Here, the first substrate 71 is a flat plate with the yz plane as its main surface, and the control IC and the like are mounted on the negative side in the x-direction of the first substrate 71 (inside the figure). In addition, the third heat-generating element 63 is fixed to the cooling fins 11 in the heat dissipation section 10B.

[0046] exist Figure 5In (b), the second substrate 72, which houses small capacitors or resistors to form an inverter circuit, is also positioned with a large area further to the negative y-direction than the heat sink 10B. The second substrate 72 is a flat plate with the yz plane as its main surface, and the capacitors mounted on it are positioned on its positive x-direction side (inner side in the figure). The second substrate 72 is positioned opposite the first substrate 71. Furthermore, since the aforementioned first heat-generating elements 61 (two in the figure) are used in the rectifier circuit, they are also fixed to the positive y-direction and positive z-direction sides of the second substrate 72. Because they are large, they protrude from the second substrate 72 toward the side where the first substrate 71 is located (positive x-direction side). Here, as... Figure 5 As shown in (a), in order to improve the cooling efficiency of the two first heating elements 61, a notch is provided on the first substrate 71, in which the first heating elements 61 are exposed. This structure is the same as that described in Patent Document 1.

[0047] In addition, such as Figure 5 As shown in (b), the second heating element 62 is fixed near the end on the positive side of the y-direction on the negative side of the x-direction of the heat dissipation section 10B. In fact, the second heating element 62 is a switching element as described above, and multiple such switching elements are provided. Here, these switching elements are arranged along the z-direction and are described as a second heating element 62 that is elongated in the z-direction. The aforementioned cooling fins 11 are provided on the back side of the surface of the frame 10 on which the second heating element 62 is fixed.

[0048] Therefore, the heat generated by the second heating element 62 fixed to the heat dissipation section 10B is transferred to the heat dissipation section 10B (frame 10), and dissipated in the x-direction (inner side) by the cooling air flowing between the cooling fins 11. The heat dissipation of the third heating element 63 is also achieved by the cooling air flowing between the cooling fins 11. Thus, the cooling air, which becomes high-temperature after cooling the heat dissipation section 10B (second heating element 62, third heating element 63), is dissipated by the cooling air flowing between the cooling fins 11. Figure 1 , Figure 2 Multiple small openings (exhaust ports 20A) formed on the z-direction positive side surface (upper surface) of the first cover component 20 discharge to the outside. Therefore, control ICs and the like mounted on the first substrate 71 are not exposed to the cooling air that becomes high temperature.

[0049] Here, in the frame 10, the cooling airflow from the cooling fan 50 is branched into a first airflow path located on the positive side of the x-direction relative to the frame 10 and a second airflow path located on the negative side of the x-direction, with the flow directions of the cooling airflow in the first airflow path and the second airflow path being different. The second airflow path enables particularly efficient cooling of the first heat-generating element 61 mounted on the second substrate 72.

[0050] The structure of the frame 10 for this purpose will be described. This is to allow the cooling air to flow separately on the positive and negative sides of the x-direction of the frame 10. Figure 3 In (b), the airflow separation section 12 is located on the negative side of the heat dissipation section 10B in the y direction and on the positive side of the cooling fan 50 in the z direction. Airflow guide sections 13 are provided on the positive side of the airflow separation section 12 in the z direction (downstream of the cooling air) and on the negative side in the x direction. The airflow separation section 12 is a flat plate whose surfaces on both the positive and negative sides in the x direction are parallel to (or intersect with) the yz plane. The cooling air flows along the z direction towards the positive side in the z direction in both the first airflow path (which is on the positive side in the x direction) and the second airflow path (which is on the negative side) of the airflow separation section 12.

[0051] On the other hand, the air guide 13 is provided on the negative side of the x-direction and the positive side of the air path separation section 12 in the z-direction. The air guide 13 has a plane that is inclined towards the negative side of the y-direction. Figure 6 This is a sectional view of frame 10 perpendicular to the y-direction. Figure 6 (a) shows Figure 3 The cross-section in direction II (the part where the airflow separation section 12 and the air guide section 13 are provided) in (b) Figure 6 (b) shows Figure 3 The cross-section in direction II-II (the part without the airflow separation section 12 and the air guide section 13) in (b) is shown. In both cases, the cross-section between the cooling fins 11 is shown. In addition, the cooling fan 50, the first cover component 20, and the second cover component 30 are also described here.

[0052] Here, a cooling fan shroud 51 is provided on the positive side of the cooling fan 50 in the z-direction, and cooling air is blown out from the opening formed in the cooling fan shroud 51, i.e., the cooling air outlet 51A, in the positive side of the z-direction as described above. The cooling fan 50 is fixed relative to the frame 10 so that the airflow separation part 12 abuts against the cooling fan shroud 51. Therefore, as Figure 6 As shown in (a) and (b), regardless of the presence or absence of the airflow separation section 12, in the first airflow path on the positive side of the x-direction of the frame 10, as indicated by arrow A1, the cooling air flows on the positive side of the z-direction. Furthermore, in the case where the airflow separation section 12 is present ( Figure 6 (a) In the second air path on the negative side of the air path separation section 12 in the x direction, as shown by arrow A2, the cooling air also flows towards the positive side in the z direction. Furthermore, as viewed from the positive side in the x direction... Figure 3 As shown in (a), in the first airflow path on the positive side of the x-direction of the frame 10, the cooling air flows towards the positive side of the z-direction between the cooling fins 11 as indicated by arrow A3, as described above, from... Figure 1 , Figure 2The exhaust port 20A of the first cover component 20 discharges to the outside. Furthermore, as described above, the airflow separation section 12 abuts against the cooling fan 50 (cooling fan cover 51), but the cooling fins 11 formed on the frame 10 (heat dissipation section 10B) side do not abut against the cooling fan cover 51. Therefore, the formation of a gap between the airflow separation section 12 and the cooling fan cover 51 can be suppressed, and the first airflow and the second airflow can be reliably branched into one.

[0053] On the other hand, as observed from the negative side of the x-direction Figure 3 As shown in (b), in the second airflow path on the negative side of the x-direction, the cooling airflow is deflected towards the negative side of the y-direction due to the presence of the air guide 13, as indicated by arrow A4. Therefore, Figure 5 The first heating element 61 in (b) is cooled by the cooling air. After cooling the first heating element 61, the cooling air, now at a high temperature, passes through the cooling air formed in... Figure 1 , Figure 2 Multiple small openings (exhaust ports 30A) on the positive z-direction side (upper surface) of the second cover component 30, or an exhaust port 20B located further to the negative y-direction side than the exhaust port 20A of the first cover component 20, discharge to the outside. At this time, as... Figure 5 As shown in (b), since the first heating element 61 is located on the positive side of the y direction and the positive side of the z direction of the second substrate 72, the control IC and the like mounted on the second substrate 72 will not be exposed to the cooling air that becomes high temperature.

[0054] On the other hand, in this framework 10, such as Figure 6 As shown in (a), the air guide 13 is configured as a stepped portion in the frame 10, therefore, Figure 6 In (a), the surface of the frame 10, which is closer to the positive side in the z-direction or y-direction than the airflow separation section 13, protrudes further to the negative side in the x-direction than the airflow separation section 12. Therefore, the height of the cooling fins 11 in this section along the x-direction can be increased. Figure 6 As shown in (a) and (b), because the gap between the heat dissipation section 10B and the second cover member 30 narrows in this part, cooling air is difficult to flow in this part. However, instead, the cooling fins 11 can be raised as described above, so that cooling air can be utilized along the... Figure 3 The cooling airflow flowing according to arrow A3 in (a) dissipates heat. Furthermore, due to the narrowing of the gap, it is difficult to place large components such as the first heating element 61 (a large capacitor) on the negative side of the heat sink 10B in the x-direction. In contrast, semiconductor elements such as switching elements (the second heating element 62) are thinner than the first heating element 61; therefore, as... Figure 5 As shown in (b), it can be installed on the negative side of the heat dissipation unit 10B in the x direction.

[0055] Therefore, by changing the flow direction of the cooling air relative to the frame 10 on the positive and negative sides in the x direction as described above, even when the heat-generating element and other components are densely fixed to the frame as described above, the cooling fan 50 can efficiently dissipate heat from each heat-generating element. At this time, it is also possible to prevent components other than the heat-generating element from being exposed to the cooling air that becomes hot due to their heat dissipation.

[0056] Furthermore, compared to the technology described in Patent Document 1, the cooling structure (airflow separation section 12, airflow guide section 13) described above is provided on the frame 10, and the only cooling-related component in the cover members (first cover member 20, second cover member 30) is the exhaust port of the cooling air. This type of frame 10 can be easily mass-produced by casting aluminum. Therefore, compared to the structure described in Patent Document 1, the above structure can be implemented at a lower cost.

[0057] Furthermore, in the example above, cooling fins 11 are formed in the first airflow path on the positive x-direction side of the frame 10 (heat dissipation section 10B). Therefore, on this side, cooling air needs to flow along the cooling fins 11 (z-direction). In contrast, in the second airflow path on the negative x-direction side of the frame 10, it is particularly preferable to appropriately set the flow according to the position of the heat-generating element (first heat-generating element 61 in the example above) or other components (such as control ICs in the example above) cooled by the cooling air on this side. The structure of the air guide can also achieve such flow in other examples, and can be appropriately set to a shape that can be easily formed.

[0058] Furthermore, the cooling airflow of the first and second air paths can be adjusted, for example, by setting the position of the air path separator in the x-direction. For example, in Figure 6 In (a), by placing the airflow separation section 12 further towards the positive side in the x-direction, the flow rate of the cooling air in the second airflow (negative side in the x-direction) can be increased, enabling more efficient cooling of the first heat-generating element 61. Conversely, in Figure 6 In (a), by placing the airflow separation section further away from the negative side in the x-direction, the flow rate of the cooling air in the first airflow path (positive side in the x-direction) can be increased, thereby enabling more efficient cooling of the heat dissipation section 10B (second heating element 62, third heating element 63). This setting can be appropriately adjusted according to the characteristics of the heating elements.

[0059] (Key features of this embodiment)

[0060] The features of this implementation can be summarized as follows.

[0061] (1) The motor control device 1 cools the heat-generating element, which is part of the installed components, by causing cooling air to flow inside. It includes: a cooling fan 50 that generates cooling air from one end side (negative side of z direction) along a first direction toward the other end side (positive side of z direction); and a frame 10 that extends along the first direction (z direction) and a second direction (y direction) perpendicular to the first direction (z direction). Components are fixed at multiple locations along the second direction (y direction), and the cooling fan 50 is fixed on one end side (negative side of z direction) and one side of the second direction (positive side of y direction). A planar airflow separation section 12 is provided on the other end side (positive side of z direction) of the cooling fan 50 of the frame 10, intersecting a third direction (x direction) perpendicular to the first direction (z direction) and the second direction (y direction). At a position downstream of the airflow separation section 12, the direction of cooling air flow is different on the positive and negative sides of the third direction (x direction) as viewed from the frame 10.

[0062] In this structure, the cooling airflow from a single cooling fan 50 branches into two (a first airflow and a second airflow) on both sides of the clamping frame 10 in the x-direction (perpendicular to the direction in which the cooling airflow originates from the cooling fan) via the airflow separation section 12. Thus, the flow direction of the cooling air in each airflow is set differently, enabling efficient cooling of different heat-generating components using the cooling airflow flowing in each airflow.

[0063] (2) The cooling fan cover 51, which has a cooling air outlet 51A on the positive side of the z-direction of the cooling fan 50, is abutted against the air duct separation part 12.

[0064] According to this structure, the separation of the cooling air path by the air path separation section 12 is performed with particularly strict control. Therefore, it is particularly efficient to cool each heat-generating element.

[0065] (3) On the frame 10 on the positive side of the frame 10 in the x direction and on the positive side of the cooling fan 50 in the z direction, a plurality of cooling fins 11 extending in the z direction are formed in parallel.

[0066] According to this structure, since the cooling air can flow between the cooling fins 11 by utilizing the air passage on one side in the x direction (first air passage), the cooling efficiency of the area (heat dissipation part 10B) in which the cooling fins 11 are formed in the frame 10 can be particularly improved.

[0067] (4) An air guide 13 is formed on the negative side of the x direction of the frame 10. The air guide 13 has a surface that deflects the cooling air after passing through the air separation section 12 to the negative side of the y direction.

[0068] According to this structure, the flow of cooling air in the first and second air paths formed by the air path separation section 12 is set to be different. In particular, on the negative side of the x-direction (second air path), the flow direction of the cooling air is deflected away from the heat dissipation section 10B by the air guide section 13. As a result, the heat-generating element in the downstream part away from the heat dissipation section 10B can be cooled.

[0069] (5) The air guide 13 is formed as a stepped part that makes the surface of the frame 10 on the negative side of the x direction protrude further on the negative side of the x direction than the air separation part 12.

[0070] In the frame 10, the air guide 13 can be formed into such a stepped portion particularly easily. In addition, with this structure, the heat dissipation section 10B can be placed on the more negative side in the x direction, so the cooling fins 11 can be formed higher, and the cooling efficiency of the heat dissipation section 10B can be improved.

[0071] (6) A first board 71, which is equipped with a control IC for motor control, is fixed to the frame 10 at a position on the negative side of the y direction relative to the cooling fan 50.

[0072] In this structure, the control IC, which is used to protect the object from the heat emitted from the heat source, is set separately from the cooling fan 50 or the heat sink 10B adjacent to it.

[0073] (7) The second substrate 72, on which the first heating element 61 is mounted, is fixed to the frame 10 relative to the first substrate 71 at a position on the negative side of the x direction, and the first heating element 61 is mounted in such a way that it protrudes from the positive side of the z direction and the positive side of the y direction toward the positive side of the x direction. A notch is provided on the first substrate 71 so that the first heating element 61 is exposed when viewed from the positive side of the x direction.

[0074] In this structure, a large smooth capacitor or similar component that requires cooling when forming a rectifier circuit on the second substrate 72 is used as the first heat source 61. According to this structure, the first heat source 61 can be efficiently cooled using cooling air flowing in the second airflow path.

[0075] (8) The second heating element 62 is fixed in the negative x-direction side of the region in the frame 10 where the cooling fins 11 are formed.

[0076] (9) The third heating element 63 is fixed relative to the cooling fins 11.

[0077] With these structures, the second heating element 62 and the third heating element 63 are fixed to the heat dissipation section 10B, which has cooling fins 11, and are thus cooled. At this time, a thin-film heating element (switching element) can be used as the second heating element 62, and a resistor such as a regenerative resistor can be used as the third heating element 63, and they can be cooled efficiently in the heat dissipation section 10B.

[0078] (10) It has a first cover component 20 and a second cover component 30 that cover the frame 10 from the positive and negative sides in the x direction respectively when the cooling air is flowing.

[0079] By combining these cover components and frame 10 as described above, the heating element can be cooled efficiently, and assemblability and maintainability can be improved.

[0080] The present invention has been described based on embodiments and their variations, but these embodiments are merely examples. Those skilled in the art will understand that the combination of these constituent elements, etc., can have various variations, and such variations are also within the scope of the present invention.

[0081] Figure Labels

[0082] 1. Motor control device

[0083] 10 Framework

[0084] 10A Cooling Fan Storage Section

[0085] 10B Heatsink

[0086] 10C substrate storage section

[0087] 11 Cooling fins

[0088] 12. Airflow separation section

[0089] 13 Air guide section

[0090] 20 First Cover Component

[0091] 20A, 20B, 30A exhaust ports

[0092] 30 Second Cover Component

[0093] 40 Third Cover Component

[0094] 50 Cooling Fans

[0095] 51 Cooling Fan Cover

[0096] 51A Cooling air exhaust outlet

[0097] 61 First heating element

[0098] 62 Second heating element

[0099] 63 Third heating element

[0100] 71 First substrate

[0101] 72 Second substrate.

Claims

1. A motor control device that cools a heat-generating element that is part of an installed component by circulating cooling air inside, characterized in that, have: A cooling fan that generates cooling air from one end side towards the other end side along a first direction; and A frame extending along a first direction and a second direction perpendicular to the first direction, with the component fixed at multiple locations along the second direction, and the cooling fan fixed at one end and one side along the second direction. At the other end of the cooling fan in the frame, a planar airflow separation section is provided that intersects with a third direction perpendicular to the first and second directions. At a location downstream of the cooling airflow section, on the third upward side as viewed from the frame, the direction of the cooling airflow differs between the two sides. A cooling fan shroud with a cooling air outlet is abutted against the air duct separation part, and the cooling air outlet is the outlet of the cooling air at the other end of the cooling fan.

2. The motor control device according to claim 1, characterized in that, On the third-direction upward side of the frame, a plurality of cooling fins extending in parallel along the first direction are formed on the other end side of the frame of the cooling fan.

3. The motor control device according to claim 2, characterized in that, An air guide is formed on the other side of the third direction of the frame, the air guide having a surface that deflects the cooling air after passing through the air path separation section to the other side in the second direction.

4. The motor control device according to claim 3, characterized in that, The air guide portion is formed as a stepped portion that makes the surface of the third upward side of the frame protrude to the other side than the airflow separation portion.

5. The motor control device according to claim 3, characterized in that, A first substrate equipped with a control IC for controlling the motor is fixed to the frame at a position on the other side in the second direction, relative to the cooling fan.

6. The motor control device according to claim 5, characterized in that, A second substrate, which is equipped with a first heating element, is fixed to the frame at a position opposite to the first substrate on the third upward side. The first heating element is mounted such that it protrudes from the other end of the second substrate and from the side in the second direction toward the side in the third direction. The first substrate has a notch that exposes the first heating element when viewed from the side upward from the third.

7. The motor control device according to any one of claims 2 to 6, characterized in that, The second heating element, serving as the heating element, is fixed to the third-facing side of the region in the frame where the cooling fins are formed.

8. The motor control device according to any one of claims 2 to 6, characterized in that, The third heating element, which serves as the heating element, is fixed to the cooling fins.

9. The motor control device according to any one of claims 1 to 6, characterized in that, The frame is provided with a cover component that covers the frame from the third upward side and the other side respectively when the cooling air flows through it.

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