Motor-driven compressor

Abstract

To provide a motor-driven compressor that can suppress emission of vibration and noise.SOLUTION: In a motor-driven compressor 10, a projected area of the capacitor main body 57 to a circuit board 51 in the axial direction X is smaller than a projected area of the capacitor main body 57 to the outer peripheral surface 24a of the motor housing 24 in the radial direction R.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an electric compressor. [Background technology]

[0002] For example, the electric compressor described in Patent Document 1 has a compression mechanism as a compression unit, an electric motor as a motor, an inverter control device as an inverter, and a housing. The housing has a compressor housing that houses the compression mechanism, a motor housing that houses the electric motor, an inverter housing that houses the inverter control device, and a cover connected to the inverter housing.

[0003] The inverter housing has a cylindrical side wall and a partition wall that closes the side wall on the rear side of the electric compressor. The space defined by the side wall and the partition wall is closed by a cover, and an inverter chamber that houses an inverter control device is defined in the space defined by the side wall, the partition wall, and the cover.

[0004] Furthermore, in the electric compressor of Patent Document 1, each of the inverter housing and the cover is provided with a protrusion that protrudes radially outward beyond the outer peripheral surface of the motor housing when viewed from the side in the axial direction of the motor housing, and these protrusions expand the inverter chamber. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2020 / 090701 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the electric compressor of Patent Document 1, there is a risk that the inverter housing and the protruding portion of the cover may vibrate. Furthermore, there is a risk that the vibration of the inverter housing and the protruding portion of the cover may generate noise. [Means for solving the problem]

[0007] An electric compressor for solving the above problems includes a rotating shaft, a motor for rotating the rotating shaft, a compression unit for compressing a fluid by rotation of the rotating shaft, an inverter for driving the motor, and a housing for accommodating the rotating shaft, the compression unit, the motor, and the inverter, wherein the inverter has a drive element for driving the motor and a circuit board on which electronic components for removing noise are mounted, and the housing includes a motor housing for accommodating the motor and defining a suction chamber for sucking in fluid, a compression unit housing for accommodating the compression unit and discharging compressed fluid, an inverter housing for defining an inverter accommodating chamber for accommodating the inverter, and a drive element for driving the motor and a circuit board on which electronic components for removing noise are mounted, and the housing includes a motor housing for accommodating the motor and defining a suction chamber for sucking in fluid, a compression unit housing for accommodating the compression unit and discharging compressed fluid, and a drive element for driving the motor and a circuit board on which electronic components for removing noise are mounted. The present invention relates to an electric compressor having a partition wall separating a chamber and the inverter accommodating chamber, wherein the electronic components have a main body portion having a noise removal function and a connection portion that electrically connects the main body portion and the circuit board, and the inverter accommodating chamber has a first accommodating space in which the circuit board is arranged to face the partition wall, and a second accommodating space that opens in the axial direction of the rotating shaft and is arranged so that the main body portion faces an outer peripheral surface of the motor housing in the radial direction of the rotating shaft, and wherein a projected area of ​​the main body portion relative to the circuit board in the axial direction is smaller than a projected area of ​​the main body portion relative to the outer peripheral surface of the motor housing in the radial direction.

[0008] This reduces the area of ​​the circuit board where the main body is located compared to when the axial projected area of ​​the main body onto the circuit board is larger than the radial projected area of ​​the main body onto the outer peripheral surface of the motor housing. This allows the inverter housing to reduce the size of the portion defining the second accommodating space in the radial direction of the rotating shaft. As a result, vibration of the inverter housing portion defining the second accommodating space can be suppressed, and noise caused by vibration can be reduced.

[0009] In the electric compressor, the electronic component may have a capacitor, the capacitor may be accommodated in the second accommodation space, the main body may be a capacitor main body having a pair of electrodes of the capacitor and a case that accommodates the pair of electrodes, and a projected area of ​​the capacitor main body onto the circuit board in the axial direction may be smaller than a projected area of ​​the capacitor main body onto the outer peripheral surface of the motor housing in the radial direction of the rotating shaft.

[0010] According to this, the projected area of ​​the capacitor body onto the circuit board in the axial direction is smaller than the projected area of ​​the capacitor body onto the outer peripheral surface of the motor housing in the radial direction of the rotating shaft. This reduces the area of ​​the portion of the circuit board where the capacitor body is disposed. As a result, the portion of the inverter housing that defines the second accommodating space where the capacitor body is disposed can be made smaller in the radial direction of the rotating shaft.

[0011] In the electric compressor, the electronic component has a magnetic component, and the magnetic component is accommodated in the second accommodation space; the main body is a magnetic component main body having a magnetic core formed from the magnetic material of the magnetic component and a coil wound around the magnetic core; and the projected area of ​​the magnetic component main body onto the circuit board in the axial direction may be smaller than the projected area of ​​the magnetic component main body onto the outer peripheral surface of the motor housing in the radial direction of the rotating shaft.

[0012] According to this, the projected area of ​​the magnetic component body on the circuit board in the axial direction is smaller than the projected area of ​​the magnetic component body on the outer circumferential surface of the motor housing in the radial direction of the rotating shaft. This reduces the area of ​​the circuit board where the magnetic component body is disposed. As a result, the area of ​​the inverter housing that defines the second accommodating space where the magnetic component body is disposed can be reduced in the radial direction of the rotating shaft.

[0013] In an electric compressor, the connection portion may be a lead wire, and the lead wire may extend so that the projected area of ​​the main body portion relative to the circuit board in the axial direction is smaller than the projected area of ​​the main body portion relative to the outer peripheral surface of the motor housing in the radial direction of the rotating shaft.

[0014] This reduces the area of ​​the circuit board where all the electronic components are arranged, and therefore the area of ​​the inverter housing that defines the second accommodating space can be reduced in the radial direction of the rotation shaft.

[0015] In the electric compressor, a heat transfer member may be provided between the main body and an outer peripheral surface of the motor housing. According to this, the heat transfer component can increase the heat dissipation area of ​​the main body, thereby allowing the electronic components to be cooled efficiently. [Effects of the Invention]

[0016] According to the present invention, the generation of vibrations and noise can be suppressed. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a partially cutaway view of an electric compressor. [Figure 2] FIG. 2 is a cross-sectional view showing a part of the electric compressor. [Figure 3] FIG. 3 is a perspective view of the housing body and the inverter. [Figure 4] FIG. 4 is a perspective view of the magnetic component. [Figure 5] FIG. 5 is a cross-sectional view illustrating the operation of the electric compressor. DETAILED DESCRIPTION OF THE INVENTION

[0018] An embodiment of an electric compressor will now be described with reference to Figures 1 to 5. The electric compressor of this embodiment is used in a vehicle air conditioner. As shown in Fig. 1, the electric compressor 10 has a housing 11, a rotating shaft 13, a compression unit 14, a motor 15, and an inverter 16. The housing 11 accommodates the rotating shaft 13, the compression unit 14, the motor 15, and the inverter 16. The motor 15 rotates the rotating shaft 13. The compression unit 14 compresses a refrigerant fluid by the rotation of the rotating shaft 13. The inverter 16 drives the motor 15.

[0019] <Housing> The housing 11 has a housing main body 20, a first cover 21, and a second cover 22. The housing main body 20, the first cover 21, and the second cover 22 are each made of metal. The housing main body 20, the first cover 21, and the second cover 22 are each made of aluminum.

[0020] 2 and 3, the housing main body 20 has a plate-like partition wall 23, a cylindrical motor housing 24, and a cylindrical inverter housing 25. The motor housing 24 extends cylindrically from the outer periphery of the partition wall 23 to one side in the thickness direction of the partition wall 23, and the inverter housing 25 extends from a part of the outer periphery of the partition wall 23 to the other side in the thickness direction of the partition wall 23.

[0021] 1, if the direction in which the central axis L of the rotating shaft 13 extends is defined as the axial direction X, the axial direction of the motor housing 24 coincides with the axial direction X of the rotating shaft 13 and also coincides with the thickness direction of the partition wall 23. Therefore, the motor housing 24 is cylindrical and extends in the axial direction X of the rotating shaft 13.

[0022] As shown in FIG. 3, the motor housing 24 is provided with a passage forming portion 12. The passage forming portion 12 protrudes from the outer peripheral surface 24a of the motor housing 24. The passage forming portion 12 is provided closer to the partition wall 23 than the axial center of the motor housing 24. A suction passage 12a is defined in the passage forming portion 12. The suction passage 12a is connected to a first end of an external refrigerant circuit (not shown). As shown in FIG. 1, the motor housing 24 and the partition wall 23 define a suction chamber S1.

[0023] As shown in FIG. 3 , the inverter housing 25 has an outer shape larger than that of the motor housing 24. The inverter housing 25 has a base portion 27 that is continuous with the outer edge of the partition wall 23, and an extension portion 28 that is not continuous with the partition wall 23. The extension portion 28 is located outward from the outer peripheral surface 24a of the motor housing 24 in a first direction Y that is perpendicular to the axial direction X. The first direction Y coincides with one of the radial directions R of the rotating shaft 13. In a side view of the motor housing 24 seen in the axial direction X, the extension portion 28 protrudes outward from the outer peripheral surface 24a of the motor housing 24. In other words, the extension portion 28 protrudes outward from the outer peripheral surface 24a of the motor housing 24 in the radial direction R of the rotating shaft 13.

[0024] As shown in FIG. 2 , unlike the base portion 27, the extension portion 28 extends further toward the motor housing 24 in the axial direction X than the partition wall 23. Due to the portion of the extension portion 28 extending toward the motor housing 24 from the partition wall 23, the dimension of the extension portion 28 in the axial direction X is larger than the dimension of the base portion 27 in the axial direction X. The extension portion 28 has a first end portion 28a and a second end portion 28b. The first end portion 28a and the second end portion 28b are each end portions of the extension portion 28 in the axial direction X. The first end portion 28a of the extension portion 28 is located at the same position as the tip portion 27a of the base portion 27 in the axial direction X. The second end portion 28b of the extension portion 28 is located on the opposite side of the first end portion 28a in the axial direction X, across the partition wall 23. The portion of the extension portion 28 that is located closer to the motor housing 24 than the partition wall 23 in the axial direction X is located on the outer periphery of the motor housing 24.

[0025] The extension portion 28 includes a blocking wall 26 that connects the outer peripheral surface 24a of the motor housing 24 and the second end 28b of the inverter housing 25. The blocking wall 26 is located closer to the motor housing 24 than the partition wall 23 in the axial direction X. That is, the blocking wall 26 is connected to the outer peripheral surface 24a of the motor housing 24 at a position that is farther toward the motor housing 24 than the partition wall 23 in the axial direction X. Therefore, inside the extension portion 28, a space S is defined by the outer peripheral surface 24a of the motor housing 24, the inner peripheral surface of the extension portion 28, and the inner surface of the blocking wall 26. This space S is defined so as to be recessed toward the motor housing 24 than the partition wall 23. Therefore, the space S is open in the axial direction X of the rotating shaft 13.

[0026] A connector 17 is provided on the closing wall 26. The connector 17 extends from the closing wall 26 to the opposite side of the inverter housing 25 in the axial direction X. The connector 17 is electrically connected to a power source (not shown) mounted on a vehicle (not shown). The connector 17 is electrically connected to a circuit board 51 (described later) by a wire 17a.

[0027] 1, the partition wall 23 has a boss 29. The boss 29 extends in the same direction as the extension direction of the motor housing 24 from the partition wall 23. The boss 29 has a recess 29a. The recess 29a is recessed from the center of the tip surface of the boss 29.

[0028] The outer shape of the first cover 21 corresponds to the outer shape of the inverter housing 25. As shown in FIG. 2 , the first cover 21 is connected to the inverter housing 25. Specifically, the first cover 21 is connected to the tip end 27a of the base 27 and the first end 28a of the extension 28. The first cover 21 closes the opening of the inverter housing 25. The first cover 21 also closes the opening of the extension 28 in the inverter housing 25. The extension 28 and the portion of the inverter housing 25 that closes the opening of the extension 28 form a protruding wall 111. As described above, in a side view of the motor housing 24 seen in the axial direction X, the extension 28 protrudes outward from the outer peripheral surface 24a of the motor housing 24. Therefore, the housing 11 has the protruding wall 111 that protrudes outward from the outer peripheral surface 24a of the motor housing 24 in a side view of the motor housing 24 seen in the axial direction X. In a side view of the motor housing 24 from the axial direction X, the direction in which the protruding wall portion 111 protrudes beyond the outer surface 24a of the motor housing 24 is defined as a first direction Y, and the direction perpendicular to the axial direction X and the first direction Y is defined as a second direction Z.

[0029] An inverter accommodating chamber S2 that accommodates the inverter 16 is defined by the partition wall 23, the extension portion 28, a portion of the outer peripheral surface 24a of the motor housing 24, the inner peripheral surface of the inverter housing 25, and the inner surface of the first cover 21. Therefore, the inverter housing 25 defines the inverter accommodating chamber S2. The inverter accommodating chamber S2 is also defined inside the protruding wall portion 111. The partition wall 23 separates the suction chamber S1 and the inverter accommodating chamber S2 in the axial direction X.

[0030] The inverter accommodating chamber S2 has a first accommodating space S21 facing the partition wall 23 in the axial direction X, and a second accommodating space S22 located outside the outer peripheral surface 24a of the motor housing 24 in a side view of the motor housing 24 seen from the axial direction X. The second accommodating space S22 is formed by closing the space S defined inside the protruding wall portion 111 with the first cover 21. Therefore, the second accommodating space S22 is an accommodating space defined inside the protruding wall portion 111.

[0031] The second accommodating space S22 is aligned with the suction chamber S1 via the motor housing 24 in the first direction Y. Therefore, the second accommodating space S22 is provided outside the outer peripheral surface 24a of the motor housing 24 in the radial direction R of the rotating shaft 13. In the following description, the surface of the outer peripheral surface 24a of the motor housing 24 that defines the second accommodating space S22 is referred to as a defining surface 240.

[0032] 1, the second cover 22 is connected to the tip end of the motor housing 24. The second cover 22 closes the opening of the motor housing 24. The second cover 22 is provided with a discharge port 22a. The discharge port 22a is connected to a second end of an external refrigerant circuit (not shown), which is the end opposite to the first end.

[0033] The electric compressor 10 is mounted on the vehicle in an orientation in which the suction chamber S1 and the first accommodation space S21 of the inverter accommodation chamber S2 are aligned horizontally, but the mounting orientation of the electric compressor 10 relative to the vehicle may be changed as appropriate. In addition, the first accommodation space S21 of the inverter accommodation chamber S2 is located above or below the second accommodation space S22 in the vertical direction.

[0034] The rotating shaft 13 is accommodated in the motor housing 24 of the housing 11. The rotating shaft 13 extends in the axial direction of the motor housing 24. A first shaft end of the rotating shaft 13 is inserted into a recess 29a of a boss 29. The first shaft end of the rotating shaft 13 is rotatably supported by the boss 29 via a bearing 18a. A second shaft end of the rotating shaft 13, located on the opposite side to the first shaft end, is rotatably supported by a shaft support member (not shown).

[0035] The compression unit 14 is accommodated in a motor housing 24 in the housing 11. The compression unit 14 is disposed between the motor 15 and the second cover 22 in the axial direction X. Therefore, the motor housing 24 also serves as a compression unit housing that accommodates the compression unit 14.

[0036] The motor 15 is accommodated in the suction chamber S1. That is, the suction chamber S1 also serves as a motor accommodating chamber that accommodates the motor 15. Therefore, the motor housing 24 defines the suction chamber S1 that accommodates the motor 15 and draws in fluid. The motor 15 has a rotor 41 and a stator 42. The rotor 41 has a cylindrical rotor core 41a and multiple permanent magnets 41b. The rotor core 41a is fixed to the rotating shaft 13. The multiple permanent magnets 41b are embedded in the rotor core 41a. The multiple permanent magnets 41b are arranged at equal intervals around the rotor core 41a. The stator 42 surrounds the rotor 41. The stator 42 has a cylindrical stator core 42a and a motor coil 42b. The stator core 42a is fixed to the inner circumferential surface of the motor housing 24. The motor coil 42b is wound around the stator core 42a.

[0037] When the motor coil 42b is energized, the rotor 41 rotates. The rotary shaft 13 rotates integrally with the rotor 41. When the rotary shaft 13 rotates, the compression section 14 is driven. When the compression section 14 is driven, refrigerant is drawn from the external refrigerant circuit through the suction passage 12a into the suction chamber S1. The refrigerant drawn into the suction chamber S1 is compressed by the compression section 14. The refrigerant compressed by the compression section 14 is discharged into a discharge chamber (not shown) defined within the motor housing 24, and also discharged from the discharge port 22a into the external refrigerant circuit. The compression section 14 may be of a scroll, piston, or vane type. As described above, the housing 11 has a motor housing 24 that accommodates the motor 15 and defines a suction chamber S1 that draws in the refrigerant, a compression section housing that accommodates the compression section 14 and discharges the compressed fluid, an inverter housing 25 that defines an inverter accommodating chamber S2 that accommodates the inverter 16, and a partition wall 23 that separates the suction chamber S1 and the inverter accommodating chamber S2.

[0038] <Inverter> 2 and 3, the inverter 16 accommodated in the inverter accommodation chamber S2 has a circuit board 51 on which an inverter circuit 52 including a drive element 52a that drives the motor 15, a magnetic component 53, and two capacitors 54 are mounted. The magnetic component 53 has a choke coil 55 and a conductive ring 56. The magnetic component 53 and the capacitor 54 are electronic components that eliminate noise.

[0039] The thickness direction of the circuit board 51 coincides with the axial direction X. The circuit board 51 has a first mounting surface 511 on one surface in the thickness direction and a second mounting surface 512 on the other surface in the thickness direction. The outer shape of the circuit board 51 is larger than the outer shape of the motor housing 24. The circuit board 51 has a first board portion 51a accommodated in the first accommodating space S21 of the inverter accommodating chamber S2 and a second board portion 51b accommodated in the second accommodating space S22 of the inverter accommodating chamber S2. In the first accommodating space S21 of the inverter accommodating chamber S2, the first board portion 51a of the circuit board 51 is disposed opposite the partition wall 23. Therefore, the inverter accommodating chamber S2 has the first accommodating space S21 in which the circuit board 51 is disposed opposite the partition wall 23.

[0040] The second housing space S22, which houses the second substrate portion 51b of the circuit board 51, opens in the axial direction X of the rotating shaft 13. The second substrate portion 51b, which is a part of the circuit board 51, is housed in the second housing space S22 of the inverter housing chamber S2 with the first mounting surface 511 perpendicular to the axial direction X of the rotating shaft 13. The first substrate portion 51a extends over the entire first housing space S21 in the first direction Y and also extends over the entire second housing space S21 in the second direction Z. The second substrate portion 51b extends over the entire second housing space S22 in the first direction Y and also extends over the entire second housing space S22 in the second direction Z. The two capacitors 54 and the magnetic component 53 are each housed in the second housing space S22.

[0041] The driving element 52a of the inverter circuit 52 performs a switching operation to drive the motor 15. The driving element 52a of the inverter circuit 52 is mounted on a first mounting surface 511 of the first board portion 51a of the circuit board 51.

[0042] <Magnetic parts> 4, the magnetic component 53 has a choke coil 55 and a conductive ring 56. The magnetic component 53 also has the choke coil 55 as a magnetic component main body 551. The magnetic component main body 551 has a magnetic core 60 formed from the magnetic material of the magnetic component 53, and a first coil 61 and a second coil 62 wound around the magnetic core 60.

[0043] The magnetic core 60 has a track shape. Therefore, the magnetic core 60 is a component extending in the longitudinal direction. The magnetic core 60 is formed of a ferromagnetic material, such as a ferrite core. The magnetic core 60 has a first winding portion 601, a second winding portion 602, and a pair of connecting portions 603. Each of the first winding portion 601 and the second winding portion 602 is rectangular parallelepiped-shaped. The first winding portion 601 and the second winding portion 602 extend parallel to each other. One connecting portion 603 connects one longitudinal end of the first winding portion 601 to one longitudinal end of the second winding portion 602, and the other connecting portion 603 connects the other longitudinal end of the first winding portion 601 to the other longitudinal end of the second winding portion 602.

[0044] The magnetic core 60 has a pair of core main surfaces 60a. The pair of core main surfaces 60a are end surfaces in the axial direction of the magnetic core 60 and also both surfaces in the thickness direction of the magnetic core 60. The magnetic core 60 also has a pair of core side surfaces 60b. The core side surfaces 60b are formed by the outer surfaces of the connecting portions 603. The core side surfaces 60b are end surfaces in the longitudinal direction of the magnetic core 60 that are sandwiched between the windings of the first coil 61 and the second coil 62 wound around the connecting portions 603. One of the pair of core side surfaces 60b is the surface that faces the circuit board 51, which will be described later.

[0045] Of the pair of core side surfaces 60b, one core side surface 60b connects one end of the pair of core main surfaces 60a, and the other core side surface 60b connects the other end of the pair of core main surfaces 60a. The area of ​​the core side surface 60b is smaller than the area of ​​the core main surfaces 60a.

[0046] The first coil 61 is wound around a first winding portion 601 of the magnetic core 60. Both ends of the first coil 61 are drawn out from the magnetic core 60 as a pair of first lead wires 61a. The second coil 62 is wound around a second winding portion 602 of the magnetic core 60. Both ends of the second coil 62 are drawn out from the magnetic core 60 as a pair of second lead wires 62a. Each of the pair of first lead wires 61a and the pair of second lead wires 62a is drawn out so as to follow the core main surface 60a at one of the connecting portions 603, and protrudes outward beyond the core side surface 60b of that one of the connecting portions 603.

[0047] 2, in the magnetic component main body 551, the dimension in the thickness direction of the magnetic core 60, including the first coil 61 and the second coil 62, is defined as a first dimension M1. The dimension in the longitudinal direction of the core main surface 60a is defined as a second dimension M2. The first dimension M1 is smaller than the second dimension M2. Therefore, the magnetic component main body 551 is a component that extends in the longitudinal direction.

[0048] Consider an imaginary plane T that extends along one of the core side surfaces 60b. The imaginary plane T is a plane that includes the core side surface 60b and is perpendicular to the longitudinal direction of the magnetic core 60. The first lead wire 61a and the second lead wire 62a each extend linearly from the imaginary plane T. Furthermore, the first lead wire 61a and the second lead wire 62a extend from the imaginary plane T in the axial direction X so as to overlap with the core side surface 60b.

[0049] As indicated by the two-dot chain line in Figure 4, the conductive ring 56 is annular. The conductive ring 56 is made of a conductive material, such as copper or aluminum. The conductive ring 56 has a pair of first plate portions 56a and a pair of second plate portions 56b.

[0050] The pair of first plate portions 56a and the pair of second plate portions 56b are each shaped like a rectangular flat plate. The pair of first plate portions 56a face each other with the magnetic core 60, the first coil 61, and the second coil 62 sandwiched between them. Of the pair of first plate portions 56a, one first plate portion 56a connects one end of the pair of second plate portions 56b, and the other first plate portion 56a connects the other end of the pair of second plate portions 56b. The pair of second plate portions 56b face each other. The direction in which the pair of first plate portions 56a face each other is perpendicular to the direction in which the pair of second plate portions 56b face each other.

[0051] A portion of the magnetic component main body 551 is disposed inside the conductive ring 56. The axial direction of the magnetic core 60 and the axial direction of the conductive ring 56 are perpendicular to each other. The axial direction of the magnetic core 60 coincides with the first direction Y, and the axial direction of the conductive ring 56 coincides with the axial direction X. The first winding portion 601 and the second winding portion 602 of the magnetic core 60, the portion of the first coil 61 wound around the first winding portion 601, and the portion of the second coil 62 wound around the second winding portion 602 are located inside the conductive ring 56. The pair of first plate portions 56a of the conductive ring 56 are disposed so as to sandwich the magnetic component main body 551 in the axial direction. The pair of second plate portions 56b of the conductive ring 56 are disposed so as to sandwich the magnetic component main body 551 in the direction in which the first coil 61 and the second coil 62 are arranged.

[0052] When a normal mode current flows through the first coil 61 and the second coil 62, magnetic flux leaks from the magnetic core 60. An induced current flows through the conductive ring 56 so as to generate a magnetic flux that resists the change in the leakage magnetic flux leaking from the magnetic core 60. The induced current flowing through the conductive ring 56 is then converted into thermal energy, thereby reducing normal mode noise. Therefore, the magnetic component 53 is an electronic component that removes noise. The magnetic component 53 also has a magnetic component main body 551 that has the function of removing noise.

[0053] 2, the magnetic component 53 is mounted on a first mounting surface 511 of the second substrate portion 51b of the circuit board 51. The magnetic component body portion 551 of the magnetic component 53 is provided in the second accommodating space S22 so as to face the outer peripheral surface 24a of the motor housing 24. Therefore, the inverter accommodating chamber S2 has the second accommodating space S22 in which the magnetic component body portion 551 is provided so as to face the outer peripheral surface 24a of the motor housing 24 in the radial direction R of the rotating shaft 13.

[0054] Each of the pair of first lead wires 61a and the pair of second lead wires 62a of the magnetic component main body 551 is electrically connected to the circuit board 51. Therefore, each of the pair of first lead wires 61a and the pair of second lead wires 62a is a connection portion that electrically connects the magnetic component main body 551 and the circuit board 51. Each of the pair of first lead wires 61a and the pair of second lead wires 62a is connected to the circuit board 51 without being bent in a portion that extends outward beyond the core side surface 60b included in the imaginary plane T.

[0055] The magnetic component 53 is mounted on the second substrate portion 51b of the circuit board 51 and accommodated in the second accommodation space S22. That is, the magnetic component main body 551 of the magnetic component 53 is disposed inside the protruding wall portion 111. The axial direction of the magnetic core 60 is perpendicular to the axial direction X and coincides with the first direction Y. The magnetic component main body 551 is disposed inside the protruding wall portion 111 with the thickness direction of the magnetic core 60 perpendicular to the axial direction X. One of the pair of core main surfaces 60a faces the demarcating surface 240, which is the outer circumferential surface 24a of the motor housing 24.

[0056] Of the pair of first plate portions 56a of the conductive ring 56, one first plate portion 56a is located between the motor housing 24 and the magnetic component main body 551. Furthermore, of the pair of core side surfaces 60b of the magnetic core 60, the core side surface 60b included in the imaginary plane T along which the first lead wire 61a and the second lead wire 62a extend faces the first mounting surface 511 in the second substrate portion 51b of the circuit board 51.

[0057] <Capacitor> As shown in Figures 3 and 5, each capacitor 54 serving as an electronic component has a capacitor body 57 and lead wires 58. Each capacitor 54 has the capacitor body 57, which serves as a body for eliminating noise. The capacitor body 57 has a pair of electrodes 541 of the capacitor 54 and a case 542 that houses the pair of electrodes 541. The capacitor body 57 is rectangular. The capacitor body 57 has a pair of capacitor main surfaces 57a. The capacitor main surfaces 57a are the outer surfaces with the largest area among the six outer surfaces of the capacitor body 57. The direction in which the pair of capacitor main surfaces 57a form a pair is the thickness direction of the capacitor body 57. The capacitor body 57 also has a pair of capacitor end surfaces 57b. The capacitor end surfaces 57b are the outer surfaces with the smallest area among the six outer surfaces of the capacitor body 57 and are outer surfaces that are continuous with both longitudinal ends of the capacitor main surfaces 57a. A dimension N1 of the capacitor end surface 57b in the thickness direction of the capacitor body 57 is smaller than a dimension N2 of the capacitor main surface 57a in the longitudinal direction.

[0058] The lead wires 58 extend straight from one of the pair of capacitor end faces 57b. Of the pair of capacitor end faces 57b of each capacitor body 57, the capacitor end face 57b included in the imaginary plane T along which the lead wires 58 extend faces the first mounting surface 511 of the second substrate portion 51b of the circuit board 51.

[0059] Each capacitor 54 is mounted on the second substrate portion 51b of the circuit board 51. Specifically, each capacitor 54 is mounted on the circuit board 51 with a capacitor end surface 57b, from which the lead wires 58 extend, facing the first mounting surface 511 of the second substrate portion 51b.

[0060] Each capacitor 54 is mounted on the circuit board 51 with the longitudinal direction of the capacitor main surface 57a orthogonal to the first mounting surface 511 of the circuit board 51. That is, each capacitor 54 is mounted on the circuit board 51 with the longitudinal direction of the capacitor main surface 57a aligned with the axial direction X of the motor housing 24. The thickness direction of the capacitor body 57 also coincides with the first direction Y. Therefore, the thickness direction of the capacitor body 57 is orthogonal to the axial direction X of the motor housing 24. Thus, each capacitor 54 is disposed inside the protruding wall portion 111 with the thickness direction of the capacitor body 57 aligned with the axial direction X. Furthermore, one of the pair of capacitor main surfaces 57a faces the demarcating plane 240 on the outer circumferential surface 24a of the motor housing 24. Therefore, each capacitor 54 is accommodated in the second accommodation space S22. Therefore, the inverter accommodating chamber S2 has a second accommodating space S22 in which the capacitor body 57 is provided so as to face the outer peripheral surface 24a of the motor housing 24 in the radial direction R of the rotating shaft 13.

[0061] 3, the two capacitors 54 are arranged to sandwich the magnetic component 53 in the second direction Z. In other words, the magnetic component 53 is located between the two capacitors 54 in the second direction Z. Therefore, the two capacitors 54 and the magnetic component 53 are arranged side by side in the second direction Z inside the protruding wall portion 111. In other words, the two capacitors 54 and the magnetic component 53 are arranged side by side in the second direction Z at the same position in the first direction Y.

[0062] 2 and 5, the connector 17 and the wiring 17a are disposed at a position farther from the motor housing 24 in the first direction Y than the two capacitors 54 and the magnetic component 53. In other words, the two capacitors 54 and the magnetic component 53 are disposed at a position closer to the motor housing 24 in the first direction Y than the connector 17 and the wiring 17a.

[0063] A potting material P serving as a heat transfer member is provided between the magnetic component body 551, the conductive ring 56, and the capacitor 54 and the outer peripheral surface 24a of the motor housing 24. The potting material P may also be provided between the blocking wall 26 and the core side surface 60b of the magnetic component body 551 from which the first lead wire 61a and the second lead wire 62a are not drawn, and between the capacitor end surface 57b of the capacitor 54 from which the lead wire 58 is not drawn.

[0064] [Operation of this embodiment] The operation of this embodiment will be described below. In the following explanation of the operation, the capacitor 54 will be used as a specific example.

[0065] A comparative example is shown by the two-dot chain line in FIG. 5 . In the comparative example, the lead wires 58 of the capacitor 54 are bent, and one capacitor main surface 57a of the capacitor 54 is disposed facing the first mounting surface 511 of the second substrate portion 51b. In this case, the projected area of ​​the capacitor main surface 57a onto the circuit board 51 in the axial direction X of the rotating shaft 13 is the same as the size of the capacitor main surface 57a. Furthermore, the projected area of ​​the capacitor main surface 57 onto the outer peripheral surface 24a of the motor housing 24 in the radial direction R of the rotating shaft 13 is the same as the size of the capacitor end surface 57b. Therefore, the projected area of ​​the capacitor main surface 57 onto the circuit board 51 in the axial direction X is larger than the projected area of ​​the capacitor main surface 57 onto the outer peripheral surface 24a of the motor housing 24 in the radial direction R.

[0066] As shown by the solid lines in FIG. 5 , in this embodiment, the lead wires 58 of the capacitor 54 extend straight without being bent, and one capacitor end face 57b of the capacitor 54 is disposed facing the first mounting surface 511 of the second substrate portion 51b. In this case, the projected area of ​​the capacitor body 57 onto the circuit board 51 in the axial direction X of the rotating shaft 13 is the same as the size of the capacitor end face 57b. Furthermore, the projected area of ​​the capacitor body 57 onto the outer peripheral surface 24a of the motor housing 24 in the radial direction R of the rotating shaft 13 is the same as the size of the capacitor main surface 57a. Therefore, the projected area of ​​the capacitor body 57 onto the circuit board 51 in the axial direction X is smaller than the projected area of ​​the capacitor body 57 onto the outer peripheral surface 24a of the motor housing 24 in the radial direction R.

[0067] Furthermore, the lead wires 58 are arranged to overlap the capacitor end faces 57b in the axial direction X of the rotating shaft 13. Therefore, the lead wires 58 extend such that the projected area of ​​the capacitor body 57 onto the circuit board 51 in the axial direction X is smaller than the projected area of ​​the capacitor body 57 onto the outer peripheral surface 24a of the motor housing 24 in the radial direction R of the rotating shaft 13.

[0068] In this embodiment, as shown by the solid lines in FIG. 2 , the first lead wire 61a and the second lead wire 62a of the magnetic component 53 extend straight without being bent. The magnetic component main body 551 is disposed such that one core side surface 60b of the magnetic core 60 faces the first mounting surface 511 of the second substrate portion 51b. In this case, the projected area of ​​the magnetic component main body 551 onto the circuit board 51 in the axial direction X of the rotating shaft 13 is substantially the same as the size of the core side surface 60b. The projected area of ​​the magnetic component main body 551 onto the outer peripheral surface 24a of the motor housing 24 in the radial direction R of the rotating shaft 13 is substantially the same as the size of the core main surface 60a. Therefore, the projected area of ​​the magnetic component main body 551 onto the circuit board 51 in the axial direction X is smaller than the projected area of ​​the magnetic component main body 551 onto the outer peripheral surface 24a of the motor housing 24 in the radial direction R.

[0069] Furthermore, the first lead wire 61a and the second lead wire 62a are arranged to overlap the core side surface 60b in the axial direction X of the rotating shaft 13. Therefore, the first lead wire 61a and the second lead wire 62a extend such that the projected area of ​​the magnetic component main body 551 onto the circuit board 51 in the axial direction X is smaller than the projected area of ​​the magnetic component main body 551 onto the outer peripheral surface 24a of the motor housing 24 in the radial direction R of the rotating shaft 13.

[0070] The connector 17 and the wiring 17a are disposed at a position farther from the motor housing 24 in the first direction Y than the two capacitors 54 and the magnetic components 53. That is, in the inverter accommodating chamber S2, an area W for arranging the connector 17 and connecting the wiring 17a is provided outside the capacitors 54 and the magnetic components 53 in the first direction Y. Therefore, in the comparative example, when the area W is provided outside the capacitors 54 and the magnetic components 53 in the first direction Y, the connector 17 and the wiring 17a are disposed at a position farther from the motor housing 24 in the first direction Y than in the embodiment, as shown by the two-dot chain line in FIG. 5 . In contrast, in the present embodiment, the area in which the capacitors 54 and the magnetic components 53 are disposed in the second substrate portion 51b of the circuit board 51 is smaller. Therefore, even if the area W for arranging the connector 17 and connecting the wiring 17a is provided in the second substrate portion 51b, the dimension of the second substrate portion 51b in the first direction Y is smaller than in the comparative example. Therefore, the dimension in the first direction Y of the protruding wall portion 111 that houses the second substrate portion 51b can also be made smaller than that of the comparative example.

[0071] [Effects of this embodiment] The effects of this embodiment will be described. (1) The capacitor 54 disposed in the second accommodating space S22 inside the inverter housing 25 is mounted on the circuit board 51 so that the projected area of ​​the capacitor body 57 onto the second board portion 51b in the axial direction X is smaller than the projected area of ​​the capacitor body 57 onto the outer peripheral surface 24a of the motor housing 24 in the radial direction R. In other words, the longitudinal direction of the capacitor body 57 extends in the axial direction X. Therefore, when the housing 11 is viewed from the axial direction X, the portion of the inverter housing 25 that defines the second accommodating space S22 can be made smaller in the radial direction R of the rotating shaft 13. As a result, vibration of the portion of the inverter housing 25 that defines the second accommodating space S22 can be suppressed, and noise caused by vibration can be suppressed.

[0072] (2) The magnetic component 53 arranged in the second accommodation space S22 inside the inverter housing 25 is mounted on the circuit board 51 so that the projected area of ​​the magnetic component main body 551 onto the second board portion 51b in the axial direction X is smaller than the projected area of ​​the magnetic component main body 551 onto the outer peripheral surface 24a of the motor housing 24 in the radial direction R. In other words, the longitudinal direction of the magnetic component main body 551 extends in the axial direction X. Therefore, when the housing 11 is viewed from the axial direction X, the portion of the inverter housing 25 that defines the second accommodation space S22 can be made smaller in the radial direction R of the rotating shaft 13. As a result, it is possible to suppress vibration of the portion of the inverter housing 25 that defines the second accommodation space S22, and to suppress noise caused by vibration.

[0073] (3) The inverter housing 25 of the housing 11 defines a second housing space S22 that accommodates two capacitors 54 and a magnetic component 53. The extensions 28 that define the second housing space S22 that accommodates these three components function as ribs of the housing 11. This further suppresses vibration of the portion of the inverter housing 25 that defines the second housing space S22.

[0074] (4) The capacitor body 57 of the capacitor 54 is a component in which the longitudinal dimension N2 of the capacitor main surface 57a is larger than the dimension N1 of the capacitor end surface 57b. Furthermore, the magnetic component body 551 of the magnetic component 53 is a component in which the second longitudinal dimension M2 is larger than the first longitudinal dimension M1. Even if the magnetic component 53 and the capacitor 54 having such longitudinal dimensions are disposed in the second accommodating space S22 of the inverter housing 25, the electric compressor 10 can further reduce the size of the portion of the inverter housing 25 that defines the second accommodating space S22. As a result, noise caused by the vibration of the inverter housing 25 can be reduced.

[0075] (5) The capacitor 54 is disposed such that the thickness direction of the capacitor body 57 is perpendicular to the axial direction X. The magnetic component 53 is disposed such that the axial direction of the magnetic core 60 in the magnetic component body 551 is perpendicular to the axial direction X. The two capacitors 54 and the magnetic components 53 are disposed side by side in the second direction Z. For example, compared to when the two capacitors 54 and the magnetic components 53 are disposed side by side in the first direction Y, i.e., the radial direction R, the second substrate portion 51b for mounting the two capacitors 54 and the magnetic components 53 can be made smaller in the radial direction R. Therefore, when the housing 11 is viewed from the axial direction X, the portion of the inverter housing 25 that defines the second accommodating space S22 can be made smaller in the radial direction R of the rotating shaft 13. As a result, vibration of the portion of the inverter housing 25 that defines the second accommodating space S22 can be suppressed, and noise caused by the vibration can be suppressed.

[0076] (6) The capacitor 54 is disposed such that the thickness direction of the capacitor body 57 is perpendicular to the axial direction X. As a result, the capacitor end face 57b faces the circuit board 51, and the lead wires 58 extending from the capacitor end face 57b extend straight. The magnetic component body 551 of the magnetic component 53 is disposed such that the axial direction of the magnetic core 60 is perpendicular to the axial direction X. The first lead wire 61a and the second lead wire 62a of the magnetic component 53 extend straight toward the circuit board 51 after passing the core side surface 60b. Therefore, the lead wires 58, 61a, and 62a are not bent for connection to the circuit board 51. Therefore, compared to when the lead wires 58, 61a, and 62a are provided with bent portions, the number of locations where stress concentrates can be reduced in the lead wires 58, 61a, and 62a.

[0077] (7) The lead wires 58 of the capacitor 54 extend such that the projected area of ​​the capacitor body 57 on the circuit board 51 in the axial direction X is smaller than the projected area of ​​the capacitor body 57 on the outer peripheral surface 24a of the motor housing 24 in the radial direction R of the rotating shaft 13. Furthermore, the first lead wires 61a and the second lead wires 62a of the magnetic component 53 extend such that the projected area of ​​the magnetic component body 551 on the circuit board 51 in the axial direction X is smaller than the projected area of ​​the magnetic component body 551 on the outer peripheral surface 24a of the motor housing 24 in the radial direction R of the rotating shaft 13. This reduces the area of ​​the portion of the circuit board 51 where the capacitor 54 and the magnetic component body 551 are disposed. Therefore, the portion of the inverter housing 25 that defines the second accommodation space S22 can be reduced in size in the radial direction R of the rotating shaft 13.

[0078] (8) A potting material P is provided between the capacitor body 57 and the outer peripheral surface 24a of the motor housing 24. In addition, a potting material P is also provided between the magnetic component body 551 and the outer peripheral surface 24a of the motor housing 24. This allows the potting material P to increase the heat dissipation area of ​​the capacitor body 57 and the magnetic component body 551, thereby enabling the capacitor body 57 and the magnetic component body 551 to be cooled efficiently.

[0079] [Example of change] The above-described embodiments can be modified as follows: The above-described embodiments and the following modifications can be combined with each other within the scope of technical compatibility.

[0080] The configuration of the housing 11 may be changed as appropriate. For example, in the above embodiment, the partition wall 23, the motor housing 24, the inverter housing 25, and the extension portion 28 are integrally formed as the housing main body 20, but they do not have to be integrally formed. Specifically, the motor housing 24 and the inverter housing 25 are separate bodies, and the extension portion 28 is integrally formed with the motor housing 24. Then, when the motor housing 24 and the inverter housing 25 are integrated, the motor housing 24 and the inverter housing 25 may define the second accommodating space S22.

[0081] The second housing space S22 may house only one of the magnetic component 53 and the two capacitors 54 as electronic components. The second housing space S22 may house an electronic component other than the magnetic component 53 and the two capacitors 54, such as the drive element 52a that constitutes the inverter circuit 52.

[0082] The magnetic component 53 of the inverter 16 does not have to include the conductive ring 56 . Of the magnetic component 53 and the two capacitors 54, the magnetic component 53 and one capacitor 54 may be arranged side by side in the second direction Z, and the remaining capacitor 54 may be arranged further outward in the first direction Y than the capacitor 54 and the magnetic component 53 arranged side by side in the second direction Z.

[0083] Alternatively, of the magnetic component 53 and the two capacitors 54, two capacitors 54 may be arranged side by side in the second direction Z, and the remaining magnetic component 53 may be arranged further outward in the first direction Y than the capacitors 54 arranged side by side in the second direction Z.

[0084] Furthermore, the magnetic component 53 and the two capacitors 54 may all be arranged side by side in the first direction Y. The lead wire 58 may have a bent portion if the projected area of ​​the capacitor body 57 on the second substrate portion 51b in the axial direction X is smaller than the projected area of ​​the capacitor body 57 on the outer peripheral surface 24a of the motor housing 24 in the radial direction R of the rotating shaft 13. Furthermore, the first lead wire 61a and the second lead wire 62a may have a bent portion if the projected area of ​​the magnetic component body 551 on the second substrate portion 51b in the axial direction X is smaller than the projected area of ​​the magnetic component body 551 on the outer peripheral surface 24a of the motor housing 24 in the radial direction R of the rotating shaft 13.

[0085] The heat transfer member may be a heat dissipation grease or a heat dissipation sheet other than the potting material P. The electric compressor 10 may be used for purposes other than vehicle air conditioning systems. For example, the electric compressor 10 may be installed in a fuel cell vehicle. The electric compressor 10 is used to compress air, which serves as a fluid to be supplied to a fuel cell, using the compression unit 14. [Explanation of symbols]

[0086] P...potting material as heat transfer member, R...radial direction, S1...suction chamber, S2...inverter accommodating chamber, S21...first accommodating space, S22...second accommodating space, X...axial direction, 10...electric compressor, 11...housing, 13...rotating shaft, 14...compression section, 15...motor, 16...inverter, 23...partition wall, 24...motor housing, 24a...outer surface, 25...inverter housing, 51...circuit board, 52a...driving element, 53...magnetic component as electronic component, 54...capacitor as electronic component, 57...capacitor main body as main body, 58...lead wire as connecting section, 60...magnetic core, 61...first coil, 61a...first lead wire as connecting section, 62...second coil, 62a...second lead wire as connecting section, 541...electrode, 542...case, 551...magnetic component main body as main body.

Claims

1. A rotation axis; a motor that rotates the rotary shaft; a compression unit that compresses a fluid by rotation of the rotary shaft; an inverter that drives the motor; a housing that accommodates the rotating shaft, the compression unit, the motor, and the inverter, the inverter has a circuit board on which a drive element for driving the motor and an electronic component for removing noise are mounted, The housing includes: an electric compressor having a motor housing that accommodates the motor and defines a suction chamber that draws in fluid; a compression unit housing that accommodates the compression unit and discharges compressed fluid; an inverter housing that defines an inverter accommodating chamber that accommodates the inverter; and a partition wall that separates the suction chamber and the inverter accommodating chamber, the electronic component has a main body having a function of removing noise and a connection portion that electrically connects the main body and the circuit board, the inverter accommodating chamber includes a first accommodating space in which the circuit board is disposed so as to face the partition wall, and a second accommodating space that opens in the axial direction of the rotating shaft and is provided so that the main body portion faces an outer peripheral surface of the motor housing in the radial direction of the rotating shaft, 10. The electric compressor, wherein a projected area of ​​the main body portion on the circuit board in the axial direction is smaller than a projected area of ​​the main body portion on an outer peripheral surface of the motor housing in the radial direction.

2. the electronic component includes a capacitor; The capacitor is accommodated in the second accommodation space, the main body is a capacitor main body having a pair of electrodes of the capacitor and a case that houses the pair of electrodes, 2. The electric compressor according to claim 1, wherein a projected area of ​​the capacitor body on the circuit board in the axial direction is smaller than a projected area of ​​the capacitor body on an outer peripheral surface of the motor housing in a radial direction of the rotary shaft.

3. the electronic component has a magnetic component, The magnetic component is accommodated in the second accommodation space, the main body is a magnetic component main body having a magnetic core formed of the magnetic material of the magnetic component and a coil wound around the magnetic core, 2. The electric compressor according to claim 1, wherein a projected area of ​​the magnetic component body onto the circuit board in the axial direction is smaller than a projected area of ​​the magnetic component body onto an outer peripheral surface of the motor housing in a radial direction of the rotary shaft.

4. the connection portion is a lead wire, 2. The electric compressor according to claim 1, wherein the lead wires extend such that a projected area of ​​the main body portion relative to the circuit board in the axial direction is smaller than a projected area of ​​the main body portion relative to an outer peripheral surface of the motor housing in a radial direction of the rotating shaft.

5. The electric compressor according to claim 1, wherein a heat transfer member is provided between the main body and an outer peripheral surface of the motor housing.

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