electric compressor

Abstract

An electric compressor is provided that can suppress deformation in the circuit board caused by the fastening connection to the housing and busbar and effectively reduce noise components in the circuit board. The converter section includes a circuit board, a busbar fixed to the converter housing and electrically connecting an external power supply to the circuit board, a noise reduction circuit mounted on the circuit board, a first fastening connection member fastening the circuit board to the converter housing, and a second fastening connection member fastening the circuit board to the busbar. The circuit board has a first fastening connection hole through which the first fastening connection member is inserted, a second fastening connection hole disposed adjacent to the first fastening connection hole and through which the second fastening connection member is inserted, and a slit extending from the outer edge of the circuit board between the first fastening connection hole and the second fastening connection hole. Through the fastening connection of the first fastening connection hole, the circuit board is electrically connected to the converter housing as ground for the noise reduction circuit.

Description

Technical Field

[0001] This invention relates to electric compressors. Background Technology

[0002] As a conventional electric compressor, such as the electric compressor disclosed in Patent Document 1, the electric compressor disclosed in Patent Document 1 includes a motor, an inverter device, a housing with a partition wall, and a connecting member. The inverter device has a base plate. The housing has a partition wall separating a motor housing chamber that houses the motor and an inverter housing chamber that houses the inverter device. The connecting member has: a through terminal having a motor-side end disposed in the motor housing chamber and an inverter-side end disposed in the inverter housing chamber; and a busbar that electrically connects the base plate and the inverter-side end. The base plate is fixed to the inverter housing chamber by bolts.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-122426 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In the electric compressor disclosed in Patent Document 1, a plurality of fastening connection holes (hereinafter referred to as "busbar fastening connection holes") for fastening to a busbar on the power supply side and a plurality of fastening connection holes (hereinafter referred to as "housing fastening connection holes") for fastening to a housing are provided on the substrate. These fastening connection holes are for bolts to be inserted. The fastening connection portions in the substrate that are fastened by these bolts have design tolerances relative to the thickness direction of the substrate. Therefore, there is a problem that when the tolerances of adjacent bolt fastening connection portions are different, deformation will occur in the substrate that is fastened by bolts. In particular, when the busbar fastening connection holes and the housing fastening connection holes are adjacent to each other, the tolerances are different, and deformation will occur between the busbar fastening connection holes and the housing fastening connection holes in the substrate. When deformation caused by bolt fastening occurs in the circuit board, damage to the circuit board and poor conductivity of the installed electronic components due to solder breakage may occur. In particular, the closer the busbar fastening connection holes in the substrate are to the housing fastening connection holes, the greater the deformation in the substrate.

[0008] On the other hand, if the busbar fastening connection holes in the substrate and the housing fastening connection holes are sufficiently separated, deformation in the substrate can be suppressed. However, when the arrangement conditions of the electronic components on the substrate and the space constraints of the substrate are strict, it is not possible to fully separate the two fastening connection holes. Furthermore, there are cases where a noise filter that removes noise components from the current passing through the busbar is mounted on the substrate, and the grounding wire of the substrate and the housing are electrically connected by bolts inserted into the housing fastening connection holes. In this case, from the viewpoint of noise removal, it is preferable to mount the noise filter in the substrate near the busbar fastening connection holes and the housing fastening connection holes. As a result, the busbar fastening connection holes and the housing fastening connection holes are actually placed close together in the substrate. Moreover, even in pursuit of miniaturization of the electric compressor, it is preferable to place the two fastening connection holes close to each other.

[0009] The present invention was made in view of the above-mentioned problems. The object of the present invention is to provide an electric compressor that can suppress deformation in the circuit board caused by the fastening connection to the housing and busbar and effectively reduce the noise component in the circuit board.

[0010] Methods for solving problems

[0011] To address the aforementioned issues, the present invention provides an electric compressor comprising: a compression section that compresses and discharges drawn-in refrigerant; an electric motor that drives the compression section; a converter section that controls the drive of the electric motor; and a converter housing that houses the converter section. The electric compressor is characterized in that the converter section comprises: a circuit board; a busbar fixed to the converter housing and electrically connecting an external power source to the circuit board; a noise reduction circuit mounted on the circuit board that reduces noise components contained in the current flowing through the busbar; and a first fastening connection structure. The circuit board is provided with a first fastening connection member that fastens the circuit board to the converter housing; and a second fastening connection member that fastens the circuit board to the busbar. The circuit board has: a first fastening connection hole through which the first fastening connection member is inserted; a second fastening connection hole adjacent to the first fastening connection hole for insertion; and a gap extending from the outer edge of the circuit board between the first fastening connection hole and the second fastening connection hole. Through the first fastening connection member, the circuit board is electrically connected to the converter housing as ground for the noise reduction circuit.

[0012] In this invention, the circuit board has a gap extending from its outer edge and located between the first and second fastening connection holes. Therefore, even if the first and second fastening connection holes are close to each other, deformation between them can be reduced by the gap. Furthermore, by providing the gap, the first and second fastening connection holes are brought closer together, thus enabling effective absorption of noise components in the circuit board suppressed by the noise reduction circuit from the circuit board through the first fastening connection member into the housing. In other words, by providing the gap, deformation suppression and effective reduction of noise components in the circuit board can be achieved.

[0013] Alternatively, the electric compressor described above may also have the following structure: the length of the gap extending from the outer edge of the circuit board is greater than or equal to the distance between the first fastening connection hole and the second fastening connection hole.

[0014] In this case, by making the gap extend from the outer edge of the circuit board by a length greater than the distance between the first fastening connection hole and the second fastening connection hole, the deformation between the first fastening connection hole and the second fastening connection hole is reduced more appropriately.

[0015] Alternatively, the electric compressor described above can also have the following structure: the insulating member is located between the busbar and the converter housing.

[0016] In this case, an insulating member is positioned between the busbar and the converter housing. In a circuit board without gaps, the insulating member positioned between the busbar and the converter housing may contribute to deformation between the first and second fastening connection holes in the circuit board. However, since the circuit board has gaps, the deformation in the circuit board will not increase.

[0017] Invention Effects

[0018] According to the present invention, an electric compressor is provided that can suppress deformation in the circuit board caused by the fastening connection to the housing and busbar and effectively reduce noise components in the circuit board. Attached Figure Description

[0019] Figure 1 This is a schematic longitudinal sectional view of an electric compressor according to an embodiment of the present invention.

[0020] Figure 2 This is an exploded perspective view of the main parts of the electric compressor according to an embodiment of the present invention.

[0021] Figure 3 This is a front view of the circuit board of the electric compressor according to an embodiment of the present invention.

[0022] Figure 4 This is an explanatory diagram illustrating the electrical structure of the electric compressor according to an embodiment of the present invention.

[0023] Figure 5 This is a front view showing the main parts of the circuit board of the electric compressor according to an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures

[0025] 10 Electric compressors

[0026] 11. Shell

[0027] 12 Compression Section

[0028] 13 Electric motors

[0029] 14. Converter Section

[0030] 18. Converter housing

[0031] 33 Circuit board

[0032] 35 First Filter Circuit

[0033] 36. Second filter circuit

[0034] 37. Drive Circuit

[0035] 50 bolts (first fastening connection component)

[0036] 51. First through hole (first fastening connection hole)

[0037] 52 Second through hole (Second fastening connection hole)

[0038] 53 Bolt (Second Fastening Connection Component)

[0039] 57 busbar

[0040] 58. Resin section (insulating component)

[0041] 59 Grommet section (insulating component)

[0042] 62 Nut (Second Fastening Connection Component)

[0043] 63 Noise Reduction Circuit

[0044] 74, 75, 78, 79 Y capacitor banks

[0045] 76, 80 grounding wire

[0046] 82 gaps

[0047] CY1, CY2 Y capacitors

[0048] L1, L2 distance

[0049] L3 Gap Length Detailed Implementation

[0050] Hereinafter, an electric compressor according to an embodiment of the present invention will be described with reference to the accompanying drawings. The electric compressor of this embodiment is an on-board electric compressor installed in a vehicle as part of a vehicle air conditioning system.

[0051] like Figure 1 As shown, the electric compressor 10 includes a housing 11, a compression section 12, an electric motor 13, and a converter section 14. The housing 11 includes a motor housing 15 that houses the compression section 12 and the electric motor 13, a discharge housing 16 that is connected to the motor housing 15 and has a discharge port 17, and a converter housing 18 that houses the converter section 14. The motor housing 15, the discharge housing 16, and the converter housing 18 are made of aluminum alloy.

[0052] The motor housing 15 has a cylindrical peripheral wall portion 19 and a partition wall portion 20 that closes one end of the peripheral wall portion 19. The peripheral wall portion 19 and the partition wall portion 20 form a space for accommodating the compressor portion 12 and the electric motor 13. The partition wall portion 20 is engaged with the converter housing 18. In the peripheral wall portion 19, near the partition wall portion 20, a refrigerant intake port 21 is provided. The discharge housing 16 is engaged with the other end of the peripheral wall portion 19. The refrigerant drawn in through the intake port 21 is drawn into the compressor portion 12 and compressed by the compressor portion 12. The compressed refrigerant is discharged from the discharge port 17.

[0053] The converter housing 18 has a bottom wall portion 22 that engages with the partition wall portion 20 of the motor housing 15, and an outer wall portion 23 that protrudes to one side along the outer periphery of the bottom wall portion 22. The bottom wall portion 22 and the outer wall portion 23 of the converter housing 18 form a space for accommodating the converter portion 14. The converter cover 24 engages with the end face of the outer wall portion 23 to close the opening of the converter housing 18. Figure 2 As shown, a plurality of threaded holes 25 are provided on the end face of the outer wall portion 23. The threaded holes 25 are for screwing in fastening bolts (not shown) to engage the converter cover 24 with the end face of the outer wall portion 23.

[0054] A three-phase terminal section 26 is provided on the bottom wall portion 22, supplying three-phase AC power from the converter portion 14 to the electric motor 13. The three-phase terminal section 26 has rod-shaped U-phase terminal 26U, V-phase terminal 26V, and W-phase terminal 26W, and the three-phase terminal section 26 passes through the partition wall portion 20 and the bottom wall portion 22, facing the electric motor 13. Furthermore, as... Figure 2As shown, a plurality of pedestal portions 27 for mounting the circuit board 33 (described later) are formed on the inner side of the bottom wall portion 22 and the outer wall portion 23. Threaded holes 28 are provided on the end faces of the pedestal portions 27.

[0055] The compression section 12 compresses the refrigerant drawn in through the suction port 21. The refrigerant drawn in through the suction port 21 is drawn into the compression section 12 and compressed by it. The compressed refrigerant is discharged from the discharge port 17. The compression section 12 is, for example, a scroll-type compression section, or it can be a piston-type or vane-type compression section other than a scroll-type. The compression section 12 is connected to a rotating shaft 29 that is rotatably supported on the motor housing 15 and is driven by the rotation of the electric motor 13. One end of the rotating shaft 29 is rotatably supported on the partition wall 20, and the other end of the rotating shaft 29 is connected to the compression section 12.

[0056] The electric motor 13 drives the compression unit 12. The electric motor 13 includes a stator 31 fixed to the inner circumferential surface of the peripheral wall 19 of the motor housing 15, and a rotor 32 fixed to the rotating shaft 29. The electric motor 13 drives the compression unit 12 by rotating the rotating shaft 29. The electric motor 13 receives a three-phase AC power supply from the converter unit 14 and is driven by the converter unit 14.

[0057] The converter section 14 is housed within the converter housing 18. For example... Figure 2 As shown, the converter section 14 includes a circuit board 33, a power supply assembly 34, a first filter circuit 35, and a second filter circuit 36. Further, as... Figure 3 As shown, the converter section 14 includes a drive circuit 37 and a control circuit 38. The circuit board 33 is a multilayer board with a multilayer wiring pattern and has an outer periphery that is substantially similar to the outer wall portion 23 of the converter housing 18. Various electronic components, such as the first filter circuit 35 and the second filter circuit 36, are mounted on the circuit board 33 by soldering.

[0058] The outer edge of the circuit board 33 has a first outer edge portion 41 located near the power supply component 34, a second outer edge portion 42 located near the second filter circuit 36, and a third outer edge portion 43 located on the extension line of the second outer edge portion 42 and near the three-phase terminal portion 26. Additionally, the outer edge of the circuit board 33 has a fourth outer edge portion 44 located opposite to the first outer edge portion 41, a fifth outer edge portion 45 located opposite to the second outer edge portion 42, and a sixth outer edge portion 46 located opposite to the third outer edge portion 43. The first outer edge portions 41 to 46 are generally straight outer edge portions. The outer edge portions of the circuit board 33, except for the first outer edge portions 41 to 46, are respectively formed as curves. The circuit board 33 has a first surface 47 facing the converter cover 24 and a second surface 48 facing the bottom wall portion 22, the second surface 48 being the side opposite to the first surface 47.

[0059] A plurality of first through holes 51, serving as first fastening connection holes, are provided near the outer edge of the circuit board 33. The first through holes 51 are positioned in the circuit board 33 corresponding to the position of the pedestal portion 27. Each first through hole 51 is a through hole through which a bolt 50 is inserted. The circuit board 33 is fixed to the converter housing 18 by screwing the bolt 50, which is inserted into the first through hole 51, into the threaded hole 28 of the converter housing 18. The bolt 50 acts as a first fastening connection for fixing the circuit board 33 to the converter housing 18. Flat washers or spring washers can also be used for the fastening connection of the bolt 50. When differentiating the plurality of first through holes 51, the first through hole 51A is defined as a through hole located near the outer edge portion between the first outer edge portion 41 and the fifth outer edge portion 45, and the first through hole 51B is defined as a through hole located near the second outer edge portion 42. Furthermore, the first through hole 51C is defined as a through hole located near the fourth outer edge portion 44, and the first through hole 51D is defined as a through hole located near the outer edge portion between the fifth outer edge portion 45 and the sixth outer edge portion 46. When the bolts 50 are also distinguished, bolts 50A to 50D are defined as bolts corresponding to the first through holes 51A to 51D.

[0060] A pair of second through holes 52 for connecting to a power supply assembly 34 are provided on the circuit board 33. These second through holes 52 correspond to second fastening connection holes and are located near the first outer edge 41, matching the position of the power supply assembly 34. Bolts 53, connecting the circuit board 33 and the power supply assembly 34, are inserted through these second through holes 52. When distinguishing between the two second through holes 52, second through hole 52A is defined as a through hole near first through hole 51A, and second through hole 52B is defined as a through hole near first through hole 51B. Similarly, when distinguishing between bolts 53, bolt 53A is defined as a bolt inserted into second through hole 52A, and bolt 53B is defined as a bolt inserted into second through hole 52B. The bolts 53 correspond to second fastening connection members for fixing the busbar 57 (described later) to the circuit board 33.

[0061] The circuit board 33 has three through holes 54 for the U-phase terminal 26U, V-phase terminal 26V, and W-phase terminal 26W of the three-phase terminal section 26 to be inserted. The three through holes 54 are arranged in a position close to the third outer edge 43, matching the position of the three-phase terminal section 26. The three-phase terminal section 26 and the circuit board 33 are electrically connected by bolts 55 through which the U-phase terminal 26U, V-phase terminal 26V, and W-phase terminal 26W are inserted into the through holes 54.

[0062] Next, when describing the power supply component 34, the power supply component 34 is held by the converter housing 18 (see reference). Figure 1 The power supply assembly 34 has a pair of busbars 57, a resin section 58, and a loop section 59. The busbars 57 are plate-shaped conductive members that supply power to the circuit board 33 via a power connector section, capable of carrying large currents. The busbars 57 electrically connect a battery (not shown) serving as an external power source to the circuit board 33. The pair of busbars 57 are held by the resin section 58, which passes through the partition wall section 20 and the bottom wall section 22. Insulation between the busbars 57 and the housing 11 is maintained by the resin section 58 and the loop section 59, formed of a rubber-based material, which covers the periphery of the resin section 58. That is, the resin section 58 and the loop section 59 are positioned between the busbars 57 and the converter housing 18. The resin section 58 and the loop section 59 act as insulating members. When distinguishing the busbars 57, we define busbar 57A as the busbar corresponding to the second through-hole 52A, and busbar 57B as the busbar corresponding to the second through-hole 52B.

[0063] The end of the busbar 57 protruding from the resin portion 58 on the circuit board 33 side is bent to make surface contact with the pattern of the circuit board 33 and is easily elastically deformable relative to the thickness direction of the circuit board 33. The end of the busbar 57 on the opposite side of the circuit board 33 side protrudes from the resin portion 58 and is connected to the rod terminal 60 of the battery (not shown) which serves as an external power source (see reference). Figure 1 ).like Figure 2 As shown, a through hole 61 for inserting a bolt 53 is formed at the end of the busbar 57 that makes surface contact with the pattern of the circuit board 33. The busbar 57 is securely connected and electrically connected to the circuit board 33 by a bolt 53 inserted into the second through hole 52 of the circuit board 33 and the through hole 61 of the busbar 57, and by a nut 62 screwed into the bolt 53. (Ref.) Figure 1 In the case of distinguishing through holes 61, through hole 61A is designated as a through hole for bolt 53A to be inserted, and through hole 61B is designated as a through hole for bolt 53B to be inserted. Nut 62, together with bolt 53, serves as a second fastening connection component. Furthermore, the fastening connection of bolt 53 and nut 62 can also utilize flat washers or spring washers.

[0064] Next, the first filter circuit 35 and the second filter circuit 36 ​​will be described. For example... Figure 3 As shown, the first filter circuit 35 and the second filter circuit 36 ​​are disposed on the first surface 47 of the circuit board 33. The first filter circuit 35 is disposed on the first surface 47 near the first through hole 51A and the second through hole 52A. The second filter circuit 36 ​​is disposed near the second outer edge 42 and the first through hole 51B. The first filter circuit 35 and the second filter circuit 36 ​​constitute... Figure 4 This is a portion of the noise reduction circuit 63 shown. For ease of illustration, in Figure 3 In the diagram, the first filter circuit 35 and the second filter circuit 36 ​​are represented by rectangles.

[0065] Next, the drive circuit 37 and control circuit 38 will be described. The drive circuit 37 and control circuit 38 are disposed on the second surface 48 of the circuit board 33. The drive circuit 37 is a circuit for converting direct current (DC) power into alternating current (AC) power and supplying AC power to the electric motor 13. The drive circuit 37 includes multiple switching elements (not shown) to convert DC power into AC power. The control circuit 38 is a circuit for controlling the drive circuit 37. The control circuit 38 has a microprocessor (not shown) that operates according to a program. The microprocessor includes a CPU for performing calculations and a memory (not shown) for storing the program. The control circuit 38 controls the drive circuit 37 based on instructions from the air conditioning ECU (not shown). For ease of explanation, in... Figure 3 In the diagram, the driving circuit 37 and the control circuit 38 are represented by rectangles.

[0066] Next, the electrical structure of the converter section 14 will be described. For example... Figure 4As shown, in addition to the drive circuit 37 and the control circuit 38, the converter section 14 also includes a noise reduction circuit 63. This noise reduction circuit 63 is mounted on the circuit board 33 and reduces the noise component contained in the DC power flowing through the bus 57. A positive input line 67 is connected to the positive input terminal 66 of the noise reduction circuit 63. The output side of the positive input line 67 is connected to the positive output line 68 via a common-mode choke 69. The output side of the positive output line 68 is connected to the positive input terminal of the drive circuit 37. The common-mode choke 69 is used to suppress high-frequency noise propagating to the drive circuit 37.

[0067] The negative input line 72 is connected to the negative input terminal 71 of the noise reduction circuit 63. The output side of the negative input line 72 is connected to the negative output line 73 via the common-mode choke 69. Furthermore, the output side of the negative output line 73 is connected to the negative input terminal of the drive circuit 37.

[0068] The positive input line 67 and the negative input line 72 are connected in series via two Y capacitor banks 74 and 75. Two Y capacitors CY1 are connected in series in each of the Y capacitor banks 74 and 75. The Y capacitor banks 74 and 75 constitute the first filter circuit 35. A ground wire 76 is connected between the two series-connected Y capacitor banks 74 and 75. The ground wire 76 is electrically connected to the housing 11 in the circuit board 33 via a bolt 50A closest to the first filter circuit 35. The positive input line 67 and the negative input line 72 are connected via a smoothing capacitor 77.

[0069] The positive output line 68 and the negative output line 73 are connected via two Y capacitor banks 78 and 79 connected in series. Two Y capacitors CY2 are connected in series with each of the Y capacitor banks 78 and 79. The Y capacitor banks 78 and 79 constitute the second filter circuit 36. A ground wire 80 is connected between the two series-connected Y capacitor banks 78 and 79. The ground wire 80 is electrically connected to the housing 11 in the circuit board 33 via a bolt 50B closest to the second filter circuit 36. An X capacitor bank 81 is connected to the positive output line 68 and the negative output line 73. The X capacitor bank 81 consists of n X capacitors CX1 to CXn connected in parallel.

[0070] like Figure 5As shown, a straight gap 82 is formed in the circuit board 33, extending parallel to the outer edge of the first outer edge 41 and the second outer edge 42 of the circuit board 33, passing between the first through hole 51B and the second through hole 52B closest to the first through hole 51B. The gap 82 is formed so as not to interfere with the pattern of the circuit board 33 or the electronic components mounted thereon. The distance L1 between the center of the first through hole 51B and the center of the second through hole 52B is shorter than the distance L2 between the center of the first through hole 51A and the center of the second through hole 52A. This is because it is desirable to position the ground wire 80 physically close to the busbar 57.

[0071] With the circuit board 33 fixed to the converter housing 18 and the busbar 57 connected to the circuit board 33, a difference in tolerance in the thickness direction will occur between the first through hole 51B and the second through hole 52B in the circuit board 33. In particular, the busbar 57 of the power supply assembly 34 is held in the converter housing 18 via the resin portion 58 and the cable loop portion 59. Therefore, the tolerance in the second through hole 52B is likely to be larger than the tolerance of the first through hole 51B due to the sum of the tolerances of each component. As a result, the area near the bolts 53A and 53B in the circuit board 33 is higher or lower in the thickness direction of the circuit board 33 than the area near the bolt 50B. The height difference in the thickness direction of the circuit board 33 will cause deformation between the first through hole 51B and the second through hole 52B in the circuit board 33, but the gap 82 formed between the first through hole 51B and the second through hole 52B reduces the deformation caused by the difference in tolerance in the circuit board 33.

[0072] The gap 82 sufficiently ensures the creepage distance between the bolt 50B of the first through hole 51B and the bolt 53B of the second through hole 52B. By sufficiently ensuring this creepage distance, the insulation of the bolt 50B of the first through hole 51B and the bolt 53B of the second through hole 52B is improved compared to the case without the gap 82. The longer the length L3 of the gap 82, the greater the reduction in deformation in the circuit board 33, and the greater the creepage distance between the bolt 50B of the first through hole 51B and the bolt 53B of the second through hole 52B. The length L3 of the gap 82 extending from the outer edge of the circuit board 33 should be at least equal to or greater than the distance L1 between the center of the first through hole 51B and the center of the second through hole 52B (L3≥L1). The length L3 is preferably larger, especially when a large current flows in the circuit board 33. Furthermore, the bottom of the gap 82 is formed as an arc surface to easily disperse stress in order to reduce stress concentration. The dimensions of the gap 82 can be set in such a way that the stress dispersed by the arc surface of the gap 82 does not affect the pattern or the installed electronic components.

[0073] Next, the operation of the electric compressor 10 in this embodiment will be explained. When the electric compressor 10 is driven, DC power from a power source such as a battery is supplied to the circuit board 33 of the converter section 14 via the power supply assembly 34. In the circuit board 33, the noise component contained in the DC current is reduced by a noise reduction circuit 63 including a first filter circuit 35 and a second filter circuit 36. The noise component is effectively absorbed by the housing 11, for example, through grounding wires 76 and 80. The DC power with reduced noise component is converted into AC power by the drive circuit 37 and supplied to the electric motor 13. The drive circuit 37 controls the AC power supplied to the electric motor 13 based on the instructions of the control circuit 38.

[0074] The circuit board 33 is secured to the converter housing 18 by a bolt 50 inserted into the first through hole 51. The busbar 57 is secured to the circuit board 33 by a bolt 53 and a nut 62 inserted into the second through hole 52. The circuit board 33 is electrically connected to the converter housing 18 as ground for the noise reduction circuit 63 by a bolt 50B in the first through hole 51B. The thickness tolerance of the circuit board 33 in the first through hole 51B differs from the thickness tolerance of the circuit board 33 in the second through hole 52B caused by the fastening connection. Therefore, the area near bolt 53B in the circuit board 33 is either higher or lower in the thickness direction than the area near bolt 50B. The gap 82 of the circuit board 33 adds a spring function to the circuit board 33, which is easy to elastically deform, and reduces the deformation between the first through hole 51B and the second through hole 52B in the circuit board 33 caused by the height difference in the thickness direction of the circuit board 33.

[0075] The electric compressor 10 described in this embodiment achieves the following effects.

[0076] (1) The circuit board 33 has a gap 82 extending from the outer edge of the circuit board 33 and located between the first through hole 51B and the second through hole 52B. Therefore, even if the first through hole 51B and the second through hole 52B are close to each other, the deformation between the first through hole 51B and the second through hole 52B in the circuit board 33 is reduced by the gap 82, and the deformation caused by the bolt fastening connection in the circuit board 33 is also suppressed. As a result, damage to the circuit board 33 caused by deformation and poor conductivity of electronic components in the circuit board 33 due to solder breakage can be prevented. In addition, by providing the gap 82, the first through hole 51B and the second through hole 52B are brought closer to each other. Therefore, the noise components in the circuit board 33 suppressed by the noise reduction circuit 63 can be effectively absorbed from the ground wire 80 through the bolt 50B located near the busbar 57 and into the housing 11. In other words, by setting the gap 82, it is possible to suppress deformation and effectively reduce noise components in the circuit board 33.

[0077] (2) The length L3 of the gap 82 extending from the outer edge of the circuit board 33 is greater than the distance L1 between the first through hole 51B and the second through hole 52B. Therefore, the deformation between the first through hole 51B and the second through hole 52B in the circuit board 33 is reduced more appropriately.

[0078] (3) The resin part 58 and the cable ring part 59 are positioned between the busbar 57 and the converter housing 18. Since the resin part 58 and the cable ring part 59 are positioned between them, it may increase the tolerance of the second through hole 52 in the circuit board 33, but by forming the gap 82, the deformation caused by the bolt fastening connection in the circuit board 33 can be suppressed more effectively.

[0079] (4) By providing the gap 82, the noise components reduced by the second filter circuit 36 ​​of the noise reduction circuit 63 can be effectively absorbed from the ground wire 80 through the bolt 50B located near the gap 82 into the housing 11.

[0080] (5) By setting the gap 82, the first through hole 51B and the second through hole 52B become closer to each other. Therefore, in addition to improving the vibration resistance of the electric compressor 10 compared to the case where the first through hole 51B and the second through hole 52B are separated, the electric compressor 10 can also be miniaturized.

[0081] This invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention's intent, for example, as follows.

[0082] In the above embodiment, a common-mode choke, an X capacitor, and a Y capacitor are used as a noise reduction circuit, but the circuit is not limited to this. For example, the noise reduction circuit may also have a normal-mode choke in addition to the common-mode choke, and the number of Y capacitors is not particularly limited.

[0083] In the above embodiment, the length of the gap is set to be greater than or equal to the distance between the centers of the first fastening connection hole and the second fastening connection hole, but it is not limited to this. Alternatively, the length of the gap may be less than the distance between the centers of the first fastening connection hole and the second fastening connection hole.

[0084] In the above embodiment, the gap is provided to be parallel to a portion of the outer edge of the circuit board, but it is not limited to this. The gap can be provided regardless of the orientation of the outer edge of the circuit board. In addition, the gap is not limited to being straight, but can also be curved, and the width of the gap is not only constant, but can also be gradually varied.

[0085] In the above embodiment, the resin portion and the loop portion that hold the busbar are exemplified as insulating members, but the embodiment is not limited to this. The insulating member may be a single member, or it may be three or more members.

[0086] In the above embodiments, the motor housing 15 and the converter housing 18 are separate, but they can also be formed as one piece.

Claims

1. An electric compressor, said electric compressor being mounted in a vehicle and comprising: A compression section that compresses and discharges the intake refrigerant; An electric motor drives the compression section; A converter section that controls the drive of the electric motor; and A converter housing that houses the converter section. The electric compressor is characterized in that... The converter unit includes: Circuit board; Busbar, which is fixed to the converter housing, electrically connects the external power supply to the circuit board. A noise reduction circuit, mounted on the circuit board, reduces the noise component contained in the current flowing through the busbar; The first fastening connection component fastens the circuit board to the converter housing. as well as The second fastening connection component securely connects the circuit board to the busbar. The circuit board has: The first fastening connection hole is for the first fastening connection component to be inserted through; The second fastening connection hole is provided adjacent to the first fastening connection hole, and is used for the insertion of the second fastening connection component. as well as A single gap extending from the outer edge of the circuit board between the first fastening connection hole and the second fastening connection hole. The length of the single gap extending from the outer edge of the circuit board is greater than or equal to the distance between the first fastening connection hole and the second fastening connection hole. The single gap extends from the outer edge of the circuit board in the direction toward the noise reduction circuit. The noise reduction circuit is located near the first fastening connection hole. The circuit board is electrically connected to the converter housing via the first fastening connection to serve as the ground for the noise reduction circuit.

2. The electric compressor according to claim 1, characterized in that, The insulating component is positioned between the busbar and the converter housing.

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