Motor control device

Abstract

To provide a motor control device that is easy to assemble while keeping its size down. [Solution] The motor control device 1 comprises a first substrate 51 having a first mounting surface 51a on which electronic components 60 are mounted, a second substrate 52 extending parallel to the first substrate 51 and having a second mounting surface 52a larger than the first mounting surface 51a, a die-cast frame 10 supporting the first substrate 51 and the second substrate 52, and an attachment 100 for attaching the motor control device 1 to a fixing member, wherein the die-cast frame 10 is provided with a first screw hole H1 for mounting the first substrate 51, a second screw hole H2 for mounting the second substrate 52, and a third screw hole H3 for mounting the attachment 100, and when viewed from a direction perpendicular to the first mounting surface 51a, the first screw hole H1 and the second screw hole H2 are positioned so as not to overlap, and the second screw hole H2 and the third screw hole H3 are positioned so as to overlap.

Description

[[Technical Field]]

[0001] The present disclosure relates to a motor control device. [[Background Art]]

[0002] Patent Document 1 discloses an electronic device having a plurality of printed wiring boards. [[Prior Art Documents]] [[Patent Documents]]

[0003] [[Patent Document 1]] Japanese Unexamined Patent Application Publication No. 2008-311468 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0004] When a plurality of substrates are provided in an electronic device, there has been a problem that mounting the substrate becomes complicated in the assembly process depending on the arrangement of screw holes.

[0005] Further, among electronic devices, particularly motor control devices are sometimes used while being fixed to other devices, wall surfaces, or the like. In this case, a separate screw hole for attaching the motor control device is required, which also causes a problem that the entire motor control device increases in size.

[0006] An object of the present disclosure is to provide a motor control device that suppresses an increase in size and is easy to assemble. [[Means for Solving the Problem]]

[0007] A motor control device according to an embodiment of the present disclosure includes: a first substrate having a first mounting surface on which electronic components are mounted; a second substrate extending parallel to the first substrate and having a second mounting surface larger than the first mounting surface; and a die-cast frame that supports the first substrate and the second substrate. The motor control device has an attachment for mounting it to a fixed member, In a direction perpendicular to the first mounting surface, the first substrate is positioned between the second substrate and the die-cast frame. Viewed from a direction perpendicular to the first mounting surface, at least a portion of the second substrate is provided so as to cover the first substrate. The die-cast frame includes: A first screw hole for attaching the first substrate, A second screw hole for attaching the second substrate, A third screw hole for attaching the aforementioned attachment is provided, Viewed from a direction perpendicular to the first mounting surface, The first screw hole and the second screw hole are provided in positions that do not overlap. The second screw hole and the third screw hole are located in overlapping positions. [Effects of the Invention]

[0008] According to this disclosure, it is possible to provide a motor control device that is easy to assemble and can be made larger. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view showing the motor control device according to this disclosure. [Figure 2] Figure 2 is a cross-sectional view taken along line II-II in Figure 1. [Figure 3] Figure 3 is a top view showing a motor control device according to this disclosure. [Modes for carrying out the invention]

[0010] [Details of the embodiments of this disclosure] Specific examples of motor control devices according to the embodiments of this disclosure will be described below with reference to the drawings. This disclosure is not limited to these examples, but is intended to include all modifications within the meaning and scope of the claims as indicated by the claims. For the sake of clarity, the description of components having the same reference numerals as components already described in the description of embodiments will be omitted. Also, for the sake of clarity, the dimensions of the components shown in these drawings may differ from the actual dimensions of the components. In Figure 1, etc., U, D, R, L, F, and B indicate directions in the motor control device 1, where U is up, D is down, R is to the right, L is to the left, F is forward, and B is to the rear.

[0011] The motor control device 1 according to this embodiment will be described in detail with reference to Figures 1 to 3. Figure 1 is a perspective view showing the motor control device 1 according to this disclosure.

[0012] As shown in Figure 1, the motor control device 1 has a rectangular box-shaped frame 2 and an attachment 100.

[0013] Frame 2 is a member that supports the members installed inside it. Furthermore, a storage space for housing the members is formed inside frame 2. Frame 2 comprises a die-cast frame 10 made of die-cast metal and a resin frame 20 made of resin. Frame 2 is constructed by fitting the die-cast frame 10 and the resin frame 20 together.

[0014] The die-cast frame 10 has a plate-like portion 11 that forms the lower surface (the surface in the downward direction D) of the frame 2, and a rear portion 12 that forms the rear surface (the surface in the rearward direction B) of the frame 2. The plate-like portion 11 is a plate-like part that extends in the front-to-back direction and the left-to-right direction. The rear portion 12 is a plate-like part that extends in the up-to-down direction and the left-to-right direction. The lower part of the rear portion 12 and the rear part of the plate-like portion 11 are fixed to each other. The die-cast frame 10 is configured in a roughly L-shape when viewed from the left-to-right direction.

[0015] The resin frame 20 is a member that forms a part of the top surface, front surface, and left and right side surfaces of the frame 2. The resin frame 20 includes a side member 21 that forms a part of the top surface and left-right direction side surfaces of the frame 2, and a cover member 22 that forms the front surface of the frame 2. The side member 21 is fixed to the die-cast frame 10, and the cover member 22 is fixed to the side member 21 via a fitting portion 22a.

[0016] The attachment 100 is a member provided for fixing and using the motor control device 1 to a fixing member such as another device or a wall surface. The attachment 100 is made of metal, for example. The attachment 100 is fixed to the lower surface (the surface on the downward D side) of the frame 2. In the example shown in FIG. 1, by fixing the attachment 100 to another device, a wall surface, or the like, the motor control device 1 can be fixed to another device, a wall surface, or the like such that the lower surface of the frame 2 faces the other device, wall surface, or the like.

[0017] The attachment 100 includes a base plate portion 101, a mounting plate portion 102, and an extending portion 103.

[0018] The base plate portion 101 is a plate-shaped portion of the attachment 100 that is fixed to the frame 2 side. The base plate portion 101 is configured to extend substantially parallel to the lower surface of the frame 2. The base plate portion 101 has a screw hole through which a screw for fixing to the frame 2 can be inserted. The base plate portion 101 is fixed to the lower surface of the frame 2 with a screw.

[0019] The extending portion 103 is a plate-shaped portion that connects the base plate portion 101 and the mounting plate portion 102. The extending portion 103 is configured to extend downward from both left-right direction ends of the base plate portion 101.

[0020] The mounting plate portion 102 is a plate-shaped part of the attachment 100 that is fixed to other devices, walls, etc. The mounting plate portion 102 is provided at both ends of the attachment 100 in the left-right direction. The mounting plate portion 102 located to the left of the base plate portion 101 extends to the left from the lower end of the left extension portion 103, substantially parallel to the lower surface of the base plate portion 101 and the frame 2. The mounting plate portion 102 located to the right of the base plate portion 101 extends to the right from the lower end of the right extension portion 103, substantially parallel to the lower surface of the base plate portion 101 and the frame 2.

[0021] The mounting plate portion 102 has mounting holes 110 into which screws for attaching the attachment 100 to a wall or the like can be inserted. In Figure 1, the mounting holes 110 penetrate vertically. In this embodiment, the mounting holes 110 open in one direction, either left or right. With this configuration, the attachment 100 can fix the frame 2 at a distance from other devices or walls to which it is attached by the extension portion 103, thereby reducing vibrations and heat that the motor control device 1 receives from other devices to which it is attached.

[0022] Figure 2 is a cross-sectional view taken along line II-II in Figure 1. As shown in Figure 2, the motor control device 1 further includes a first substrate 51 and a second substrate 52 in a housing space covered by the frame 2.

[0023] The first substrate 51 and the second substrate 52 are resin printed circuit boards with wiring patterns formed on their surfaces. The first substrate 51 is positioned between the die-cast frame 10 and the second substrate 52. Electronic components 60 are provided on the first substrate 51 and the second substrate 52. The first substrate 51 has a first mounting surface 51a on which electronic components 60 can be attached and through holes 51b through which screws for fixing the first substrate 51 can be inserted. The second substrate 52 has a second mounting surface 52a on which electronic components 60 can be attached and through holes 52b through which screws for fixing the second substrate 52 can be inserted. The second mounting surface 52a of the second substrate 52 is larger than the first mounting surface 51a of the first substrate 51 in the front-to-back and left-to-right directions.

[0024] In this embodiment, the electronic components 60 mounted on the first substrate 51 and the second substrate 52 are, for example, switching elements such as IGBTs (Insulated Gate Bipolar Transistors), capacitors, transformers, diodes, resistors, etc. In this embodiment, the distance between the first substrate 51 and the second substrate 52 is longer than the distance between the second substrate 52 and the top surface of the frame 2. Therefore, the first substrate 51 is provided with electronic components 60 such as transformers and capacitors that have a greater height dimension than other electronic components 60.

[0025] Next, the support configuration of the first substrate 51 and the second substrate 52 by the frame 2 will be described in detail. As shown in Figure 2, the die-cast frame 10 of the frame 2 has a first boss portion 71 and a second boss portion 72 that extend upward from the plate-shaped portion 11. The first boss portion 71 supports the first substrate 51. The second boss portion 72 supports the second substrate 52.

[0026] The first boss portion 71 has a first screw hole H1 for attaching the first substrate 51. The first screw hole H1 opens at the upper end of the first boss portion 71 and penetrates the first boss portion 71 and the plate-like portion 11 in the vertical direction. The first substrate 51 is fixed to the first boss portion 71 by a through hole 51b in the first substrate 51 and a screw inserted through the first screw hole H1.

[0027] The second boss portion 72 has a second screw hole H2 for attaching the second substrate 52. The second screw hole H2 opens at the upper end of the second boss portion 72 and extends downward toward the second boss portion. The second substrate 52 is fixed to the second boss portion 72 by a through hole 52b in the second substrate and a screw inserted into the second screw hole H2. Furthermore, the second boss portion 72 has a third screw hole H3 into which a screw for fixing the attachment 100 can be inserted. As shown in Figure 2, the second boss portion 72 has a second screw hole H2 at its upper end and a third screw hole H3 at its lower end. The third screw hole H3 opens on the lower surface of the plate-shaped portion 11 and extends upward from the plate-shaped portion 11 to the second boss portion 72. The base plate portion 101 of the attachment 100 is fixed to the frame 2 by a screw inserted into the third screw hole H3.

[0028] Figure 3 is a top view showing the motor control device 1 according to the present disclosure. As shown in Figure 3, the die-cast frame 10 has four first screw holes H1, four second screw holes H2, and four third screw holes H3.

[0029] As shown in Figure 3, when viewed from above, the first screw hole H1 is positioned so as not to overlap with the second screw hole H2. In other words, as shown in Figure 3, the first boss portion 71 and the second boss portion 72 are positioned so as not to overlap when viewed from above. As shown in Figure 3, the third screw hole H3 provided in the second boss portion 72 is located in a position that overlaps with the second screw hole H2, also provided in the second boss portion 72, when viewed from above. Note that the centers of the third screw hole H3 and the second screw hole H2 do not necessarily coincide when viewed from above.

[0030] As shown in Figure 2, the first boss portion 71 is shorter in the vertical direction than the second boss portion 72. In other words, the upper tip surface 71a of the first boss portion 71 is located closer to the plate-like portion 11 than the tip surface 72a of the second boss portion 72. With this configuration, the first substrate 51 supported by the first boss portion 71 is supported at a position closer to the plate-like portion 11 of the die-cast frame 10 than the second substrate 52 supported by the second boss portion 72.

[0031] As shown in Figure 3, the first substrate 51 is provided so as to be covered by the second substrate 52 when viewed from above. The first substrate 51 is cut out at arbitrary positions so as not to interfere with the second boss portion 72 that supports the second substrate 52. For example, in this embodiment, as shown in Figure 3, the four corners of the first substrate 51 are cut out so as not to interfere with the second boss portion 72.

[0032] Conventionally, motor control devices are known that use a configuration in which multiple circuit boards are mounted on a die-cast frame for the purpose of miniaturization. In the above motor control devices, the screw holes for fixing the first circuit board and the screw holes for fixing the second circuit board were sometimes located in overlapping positions when viewed from a direction perpendicular to the mounting surface of the electronic components. However, in this configuration, additional members such as spacing tubes or spacers are required for mounting the circuit boards, which could reduce ease of assembly.

[0033] In the motor control device 1 according to this disclosure, when attaching the first substrate 51 and the second substrate 52 to the die-cast frame 10, the first substrate 51 is first screwed into the first screw hole H1 of the first boss portion 71, and then the second substrate 52 is screwed into the second screw hole H2 of the second boss portion 72. According to the configuration of this disclosure, the first screw hole H1 for attaching the first substrate 51 and the second screw hole H2 for attaching the second substrate 52 are located in positions that do not overlap when viewed from a direction perpendicular to the first mounting surface 51a of the first substrate 51. This makes it easier to screw the substrates to the die-cast frame 10, and thus facilitates the attachment of multiple substrates.

[0034] Furthermore, it has been known that motor control devices can be used by attaching an attachment to the motor control device, thereby mounting the motor control device frame to other devices or walls. In this configuration, it is necessary to screw the attachment to one of the outer surfaces of the frame. However, since the surface of the frame that extends parallel to the substrate has multiple screw holes for attaching the substrate, it was difficult to provide screw holes for attaching the attachment due to limited space. Therefore, in conventional motor control devices, the attachment was sometimes provided on the outer surface of the frame that is perpendicular to the direction in which the circuit board extends. However, with the above configuration, when the motor control device is mounted on a wall or the like, it is mounted in a direction that causes the circuit board to stand perpendicular to the wall or the like, so the motor control device protrudes from the mounted wall or the like by at least the length of the circuit board. This could potentially cause the motor control device to take up space in the surrounding area.

[0035] According to the configuration of this disclosure, when viewed from a direction perpendicular to the first mounting surface 51a, the second screw hole H2 for mounting the second substrate 52 and the third screw hole H3 for mounting the attachment 100 are located in overlapping positions. This allows the attachment 100 to be mounted parallel to the substrate. As a result, the protrusion length when the motor control device 1 is mounted to other devices or walls can be reduced, and the surrounding space is not compressed.

[0036] Furthermore, in this embodiment, the second screw hole H2 is positioned so as not to overlap with the first substrate 51 when viewed from a direction perpendicular to the first mounting surface 51a. With this configuration, the second substrate 52 can be easily attached even after the first substrate 51 has been attached to the frame 2 during the assembly of the motor control device 1. This makes it possible to provide a motor control device 1 that is easy to assemble.

[0037] Furthermore, as shown in Figure 2, in the motor control device 1 according to this disclosure, the attachment 100 may be attached to a movable device 200. The motor control device 1 according to this disclosure allows the attachment 100 to be attached along a plane parallel to the first substrate 51 and the second substrate 52, and can be attached so that the first substrate 51 and the second substrate 52 of the motor control device 1 are substantially parallel to a wall or the like. This brings the center of gravity of the motor control device 1 closer to the object to which it is attached, thus stabilizing the attachment of the motor control device 1. The motor control device 1 with the above configuration is particularly effective when attached to a moving device.

[0038] In the embodiments described above, examples were given in which four first bosses 71 and four second bosses 72 are provided, but the number of first bosses 71 and second bosses 72 is not limited to the above-described configuration. The number of first bosses 71 is sufficient to support the first substrate 51. Similarly, the number of second bosses 72 is not particularly limited as long as it is sufficient to support the second substrate 52.

[0039] In the embodiments described above, an example was described in which the die-cast frame 10 has a plate-shaped portion 11 and a back portion 12 integrally molded, but the disclosure is not limited to this. For example, the plate-shaped portion 11 and the back portion 12 may each be die-cast and fixed to each other by screws or fitting.

[0040] In the embodiments described above, an example was described in which the second mounting surface 52a of the second substrate 52 is larger than the first mounting surface 51a of the first substrate 51 in the front-rear and left-right directions, but the disclosure is not limited thereto. For example, the first mounting surface 51a may be larger than the second mounting surface 52a in at least one of the front-rear and left-right directions, as long as the first screw hole H1 and the second screw hole H2 do not overlap in a top view. In the configuration described above, the first substrate 51 may be provided with notches or holes that pass through the second boss portion 72 at arbitrary positions so as not to interfere with the second boss portion 72 that indicates the second substrate 52.

[0041] While embodiments of this disclosure have been described above, it goes without saying that the technical scope of this disclosure should not be interpreted restrictively by the description of these embodiments. These embodiments are merely examples, and it will be understood by those skilled in the art that various modifications to the embodiments are possible within the scope of the invention described in the claims. The technical scope of this disclosure should be determined based on the scope of the invention described in the claims and the scope of its equivalents. [Explanation of Symbols]

[0042] 1. Motor control device 2 frames 10 die-cast frames 11 Plate-shaped part 12 Back section 20 resin frame 21 Side members 22 Cover component 22a Mating part 51 First board 51a First mounting surface 51b Through hole 52 Second board 52a Second mounting surface 52b Through hole 60 Electronic Components 71 First Boss Section 71a,72a Tip surface 72 Second Boss Section 100 Attachments 101 Base plate section 102 Mounting plate section 103 Stretching section 110 Mounting holes 200 equipment H1 First threaded hole H2 Second threaded hole H3 Third threaded hole

Claims

1. A motor control device, A first substrate having a first mounting surface on which electronic components are mounted, A second substrate extending parallel to the first substrate and having a second mounting surface larger than the first mounting surface, A die-cast frame supporting the first substrate and the second substrate, The motor control device has an attachment for mounting it to a fixed member, In a direction perpendicular to the first mounting surface, the first substrate is positioned between the second substrate and the die-cast frame. Viewed from a direction perpendicular to the first mounting surface, at least a portion of the second substrate is provided so as to cover the first substrate. The die-cast frame includes: A first screw hole for attaching the first substrate, A second screw hole for attaching the second substrate, A third screw hole for attaching the aforementioned attachment is provided, Viewed from a direction perpendicular to the first mounting surface, The first screw hole and the second screw hole are provided in positions that do not overlap. A motor control device in which the second screw hole and the third screw hole are located in an overlapping position.

2. The motor control device according to claim 1, wherein, when viewed from a direction perpendicular to the first mounting surface, the second screw hole is provided in a position that does not overlap with the first substrate.

3. The die-cast frame has a plate-like portion extending parallel to the first substrate, The first screw hole is provided on the tip surface of the first boss portion that protrudes from the plate-like portion toward the first substrate, The motor control device according to claim 1, wherein the second screw hole is provided on the tip surface of the second boss portion that protrudes from the plate-like portion toward the second substrate.

4. The motor control device according to claim 3, wherein the tip surface of the first boss portion is located closer to the plate-like portion than the tip surface of the second boss portion.

5. The motor control device according to claim 1, wherein the attachment is mounted on a movable device.

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