Electric Compressor

Abstract

To provide a motor compressor which is excellent in noise resistance.SOLUTION: A holder 40 holds a first metal plate 51 which shields noise radiated from a capacitor 35 to a circuit board 31. Thus, the noise radiated from the capacitor 35 to the circuit board 31 is shielded by the first metal plate 51. Further, the holder 40 holds a second metal plate 52 which shields noise radiated from each output bus bar 50 to the circuit board 31. Thus, the noise radiated from each output bus bar 50 to the circuit board 31 is shielded by the second metal plate 52.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] The electric compressor includes a compression section for compressing a fluid, an electric motor for driving the compression section, a motor control device having a circuit board on which a filter element for driving the electric motor and reducing noise contained in an input current from the outside is mounted, and a housing for accommodating the motor control device. The circuit board and the holder are fixed to the housing. Also, as disclosed in Patent Document 1, for example, an electric compressor is known that includes a resin holder for holding a filter element mounted on the circuit board. The holder is accommodated in the housing. Such an electric compressor includes a conductive member that penetrates the housing and electrically connects the electric motor and the motor control device, and an output bus bar that electrically connects the conductive member and the circuit board. Also, the holder may have an output bus bar built in. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-40538 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, noise may be emitted from the filter element or the output bus bar toward the circuit board, which may affect the circuits and elements on the circuit board.

[0005] The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide an electric compressor that is excellent in noise resistance. [Means for solving the problem]

[0006] An electric compressor that solves the above-mentioned problems comprises a compression section that compresses a fluid, an electric motor that drives the compression section, a motor control device that drives the electric motor and has a circuit board on which a filter element is mounted that reduces noise contained in an input current from an external source, a housing that accommodates the motor control device internally, and a resin holder that holds the filter element and is accommodated in the housing, wherein the circuit board and the holder are fixed to the housing, and the holder holds a metal plate that blocks noise radiated from the filter element toward the circuit board.

[0007] With this, noise radiated from the filter element toward the circuit board is blocked by the metal plate, thereby preventing the circuits and elements on the circuit board from being affected by noise, resulting in excellent noise resistance.

[0008] An electric compressor that solves the above-mentioned problems comprises a compression unit that compresses a fluid, an electric motor that drives the compression unit, a motor control device that drives the electric motor and has a circuit board on which a filter element is mounted that reduces noise contained in an input current from an external source, a housing that accommodates the motor control device, a conductive member that penetrates the housing and electrically connects the electric motor and the motor control device, an output bus bar that electrically connects the conductive member and the circuit board, and a resin holder that incorporates the output bus bar and is accommodated in the housing, wherein the circuit board and the holder are fixed to the housing, and the holder holds a metal plate that blocks noise radiated from the output bus bar towards the circuit board.

[0009] With this, noise radiated from the output bus bar toward the circuit board is shielded by the metal plate, thereby preventing the circuits and elements on the circuit board from being affected by noise, resulting in excellent noise resistance.

[0010] In the above electric compressor, the metal plate may have a ground bus bar electrically connected to a ground pattern mounted on the circuit board. According to this, noise blocked by the metal plate flows to the ground via the ground bus bar and the ground pattern, so that noise radiation from the metal plate is suppressed. Thus, a configuration in which the metal plate has a ground bus bar is suitable as a configuration for suppressing noise radiation from the metal plate. Effect of the Invention

[0011] According to the present invention, it is possible to provide an electric compressor having excellent noise resistance. [Brief description of the drawings]

[0012] [Figure 1] 1 is a side cross-sectional view of a motor-driven compressor according to an embodiment, with a portion cut away; [Diagram 2] FIG. 4 is an enlarged cross-sectional view showing the periphery of an inverter case. [Diagram 3] FIG. 4 is an enlarged cross-sectional view showing the periphery of a first metal plate. [Figure 4] FIG. 4 is an enlarged cross-sectional view showing the periphery of a second metal plate. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] An embodiment of an electric compressor will now be described with reference to Figures 1 to 4. The electric compressor of the present embodiment is used, for example, in a vehicle air conditioner. 1, the housing 11 of the electric compressor 10 includes a cylindrical discharge housing 12 with a bottom, a cylindrical motor housing 13 with a bottom connected to the discharge housing 12, and an inverter case 14 connected to the motor housing 13. The discharge housing 12, the motor housing 13, and the inverter case 14 are made of a metal material, for example, aluminum. The motor housing 13 has a bottom wall 13a and a peripheral wall 13b extending cylindrically from the outer periphery of the bottom wall 13a.

[0014] A rotating shaft 15 is accommodated in the motor housing 13. Also accommodated in the motor housing 13 are a compression section 16 that is driven by the rotation of the rotating shaft 15 to compress a refrigerant as a fluid, and an electric motor 17 that rotates the rotating shaft 15 to drive the compression section 16. The compression section 16 and the electric motor 17 are arranged side by side in the axial direction, which is the direction in which the rotation axis of the rotating shaft 15 extends. The electric motor 17 is arranged closer to the bottom wall 13a of the motor housing 13 than the compression section 16. A motor chamber 18 that accommodates the electric motor 17 is formed between the compression section 16 and the bottom wall 13a in the motor housing 13.

[0015] The compression section 16 is, for example, of a scroll type including a fixed scroll (not shown) fixed inside the motor housing 13 and a movable scroll (not shown) disposed opposite the fixed scroll.

[0016] The electric motor 17 has a cylindrical stator 19 and a rotor 20 arranged inside the stator 19. The rotor 20 rotates integrally with the rotating shaft 15. The stator 19 surrounds the rotor 20. The rotor 20 has a rotor core 20a fixed to the rotating shaft 15 and a plurality of permanent magnets (not shown) provided on the rotor core 20a. The stator 19 has a cylindrical stator core 19a and a motor coil 21 wound around the stator core 19a.

[0017] An intake port 13h is formed in the peripheral wall 13b. One end of an external refrigerant circuit 22 is connected to the intake port 13h. A discharge port 12h is formed in the discharge housing 12. The other end of the external refrigerant circuit 22 is connected to the discharge port 12h. The intake port 13h is formed in a portion of the peripheral wall 13b that is located on the bottom wall 13a side. The intake port 13h is in communication with the motor chamber 18.

[0018] The refrigerant sucked into the motor chamber 18 from the external refrigerant circuit 22 through the suction port 13h is compressed in the compression section 16 by driving the compression section 16, and flows out through the discharge port 12h to the external refrigerant circuit 22. The refrigerant that has flowed out to the external refrigerant circuit 22 passes through a heat exchanger and an expansion valve of the external refrigerant circuit 22, and returns to the motor chamber 18 through the suction port 13h. The electric compressor 10 and the external refrigerant circuit 22 constitute a vehicle air conditioning device 23.

[0019] The inverter case 14 is attached to the bottom wall 13a of the motor housing 13. An inverter accommodating chamber 14a that accommodates the motor control device 30 is formed inside the inverter case 14. Therefore, the housing 11 has the inverter accommodating chamber 14a, and accommodates the motor control device 30 therein. The compression unit 16, the electric motor 17, and the motor control device 30 are arranged side by side in this order in the axial direction of the rotating shaft 15.

[0020] 2, inverter case 14 has a cylindrical case body 24 with a bottom, and a cylindrical lid member 25 with a bottom that closes the opening of case body 24. Case body 24 has a disk-shaped case bottom wall 24a and a cylindrical case peripheral wall 24b extending from the outer periphery of case bottom wall 24a. Lid member 25 has a disk-shaped lid bottom wall 25a and a cylindrical lid peripheral wall 25b extending from the outer periphery of lid bottom wall 25a.

[0021] The case body 24 and the lid member 25 are arranged with the opening end face of the case peripheral wall 24b and the opening end face of the lid peripheral wall 25b butting against each other. The inverter accommodating chamber 14a is defined by the case body 24 and the lid member 25. The inverter case 14 is attached to the bottom wall 13a of the motor housing 13 with the outer surface of the case bottom wall 24a of the case body 24 in contact with the outer surface of the bottom wall 13a of the motor housing 13.

[0022] The area of ​​the outer surface of the case bottom wall 24a is larger than the area of ​​the outer surface of the bottom wall 13a of the motor housing 13. Therefore, a part of the case bottom wall 24a protrudes outward beyond the edge of the bottom wall 13a of the motor housing 13. A cylindrical connector connection portion 14f protrudes from a portion of the outer surface of the case bottom wall 24a that protrudes beyond the edge of the bottom wall 13a of the motor housing 13. An external connector of an external power source (not shown) is electrically connected to the connector connection portion 14f.

[0023] A plurality of case boss portions 24f are provided on the inner surface of the case bottom wall 24a. A plurality of bolt insertion holes 24h are formed in the case main body 24. Each bolt insertion hole 24h penetrates each case boss portion 24f. Each bolt insertion hole 24h opens to the outer surface of the case bottom wall 24a. Furthermore, a female thread hole 13c is formed in the bottom wall 13a of the motor housing 13, which is in communication with each bolt insertion hole 24h.

[0024] A hole 13d penetrating the bottom wall 13a is formed in the bottom wall 13a of the motor housing 13. A hole 24c penetrating the case bottom wall 24a of the case main body 24 is formed in the case bottom wall 24a. The two holes 13d and 24c communicate with each other.

[0025] A terminal pin 26 is attached to the case bottom wall 24a of the case body 24. The terminal pin 26 has three conductive members 27 and a support plate 28. Each conductive member 27 is cylindrical. For convenience of illustration, only one conductive member 27 is shown in Figs. 1 and 2. The support plate 28 is attached to the inner surface of the case bottom wall 24a with the hole 24c closed.

[0026] The three conductive members 27 are supported by the case bottom wall 24a via a support plate 28 while passing through both holes 13d and 24c. Therefore, one end of each conductive member 27 protrudes into the motor chamber 18, and the other end of each conductive member 27 protrudes into the inverter accommodating chamber 14a. Thus, each conductive member 27 passes through the housing 11. A cluster block 29 is disposed in the motor chamber 18. In addition, three motor wires 21a are drawn out from the motor coil 21. The three conductive members 27 and the three motor wires 21a are electrically connected to each other via the cluster block 29.

[0027] The motor control device 30 has a circuit board 31. The circuit board 31 is accommodated in the inverter accommodation chamber 14a. A power module 33 in which a plurality of switching elements 32 are modularized is mounted on the circuit board 31. Thus, a plurality of switching elements 32 are mounted on the circuit board 31. Each switching element 32 performs a switching operation to drive the electric motor 17. Furthermore, a control circuit 34 that controls the switching operation of each switching element 32 is mounted on the circuit board 31. More specifically, the circuit board 31 is divided into a high-voltage board (not shown) and a low-voltage board (not shown) depending on the voltage applied thereto, and the power module 33 is mounted on the high-voltage board, and the control circuit 34 is mounted on the low-voltage board.

[0028] A resin holder 40 is accommodated in the inverter accommodating chamber 14a. Therefore, the holder 40 is accommodated in the housing 11. The holder 40 incorporates an output bus bar 50 for electrically connecting each conductive member 27 to the circuit board 31. The holder 40 holds three output bus bars 50. Each output bus bar 50 is electrically connected to each conductive member 27. For convenience of illustration, only one output bus bar 50 is shown in Figs. 1 and 2. The holder 40 also holds a capacitor 35, which is a filter element that reduces noise contained in an input current from the outside. The capacitor 35 in this embodiment is a film capacitor and has a square block shape. The capacitor 35 is mounted on the circuit board 31. The holder 40 also holds a power module 33 and a coil (not shown) that constitutes a filter circuit together with the capacitor 35. The filter circuit is mounted on a high-voltage board.

[0029] The holder 40 has a plate-shaped holder body 41. The holder body 41 has a plurality of cylindrical holder bosses 41f. The axial direction of each holder boss 41f coincides with the thickness direction of the holder body 41. Each holder boss 41f protrudes from a first body surface 41a located on one side of the holder body 41 in the thickness direction. The holder 40 is disposed in the inverter accommodating chamber 14a with a second body surface 41b located on the other side of the holder body 41 in the thickness direction placed on each case boss 24f. The inside of each holder boss 41f is connected to each bolt insertion hole 24h of the case body 24.

[0030] The circuit board 31 has a plurality of bolt insertion holes 31h. The circuit board 31 is placed on the end of each holder boss portion 41f on the opposite side to the first main body surface 41a, with each bolt insertion hole 31h communicating with the inside of each holder boss portion 41f. Then, each bolt B1 that passes through each bolt insertion hole 31h of the circuit board 31, the inside of each holder boss portion 41f, and each bolt insertion hole 24h is screwed into each female threaded hole 13c of the bottom wall 13a of the motor housing 13, thereby fixing the circuit board 31 and the holder 40 to the motor housing 13.

[0031] Therefore, the holder 40 is attached to the motor housing 13 while being disposed in the inverter accommodating chamber 14a. The holder 40 is disposed overlapping the circuit board 31. In the following description, the direction in which the circuit board 31 and the holder 40 overlap is referred to as the stacking direction X1 of the circuit board 31 and the holder 40. The circuit board 31 is accommodated in the inverter accommodating chamber 14a and fixed to the holder 40 while being spaced from the first main body surface 41a of the holder main body portion 41 by the amount of protrusion of each holder boss portion 41f from the first main body surface 41a.

[0032] As shown in FIG. 3, a rectangular hole-shaped holding recess 42 for holding the capacitor 35 is formed on the second body surface 41b of the holder body 41. The capacitor 35 is held in the holding recess 42 with a portion of the capacitor 35 inserted in the holding recess 42 and the other portion protruding from the holding recess 42. The capacitor 35 has a lead portion 35a electrically connected to the circuit board 31. The lead portion 35a penetrates the holder body 41, protrudes from the first body surface 41a, and is electrically connected to the circuit board 31. In this way, the capacitor 35 is mounted on the circuit board 31. The capacitor 35 is disposed at a position overlapping the portion of the circuit board 31 where the control circuit 34 is mounted in the stacking direction X1 of the circuit board 31 and the holder 40.

[0033] The holder 40 holds a first metal plate 51, which is a metal plate that blocks noise radiated from the capacitor 35 toward the circuit board 31. The first metal plate 51 is interposed between the bottom surface of the holding recess 42 and the capacitor 35. The first metal plate 51 is a thin flat plate. The first metal plate 51 extends along the bottom surface of the holding recess 42. The first metal plate 51 is fitted into the holding recess 42 and is sandwiched between the bottom surface of the holding recess 42 and the capacitor 35. A portion of the holder main body 41 is disposed between the first metal plate 51 and the circuit board 31. The first metal plate 51 is disposed between the capacitor 35 and the part of the circuit board 31 where the control circuit 34 is mounted, in the stacking direction X1 of the circuit board 31 and the holder 40.

[0034] The first metal plate 51 has a first ground bus bar 51a as a ground bus bar. The first ground bus bar 51a is integrally formed with the first metal plate 51. The first ground bus bar 51a penetrates the holder main body 41 from the bottom surface of the holding recess 42, protrudes from the first main body surface 41a, and is electrically connected to a ground pattern 31a mounted on the circuit board 31. For convenience of illustration, the ground pattern 31a is shown diagrammatically by dot hatching. The ground pattern 31a is electrically connected to ground.

[0035] As shown in Fig. 4, busbar accommodating recesses 43 in which the output busbars 50 are respectively accommodated are formed on the first body surface 41a of the holder body 41. The holder 40 also has a lid 44 that closes the opening of the busbar accommodating recess 43. The lid 44 is made of resin. The lid 44 is plate-shaped. The thickness direction of the lid 44 coincides with the thickness direction of the holder body 41.

[0036] Each output busbar 50 has a cylindrical connection terminal 50a, a busbar connecting portion 50b extending from the connection terminal 50a, and a busbar lead wire 50c connected to the busbar connecting portion 50b. The connection terminal 50a and the busbar connecting portion 50b are integrally formed. The busbar connecting portion 50b and the busbar lead wire 50c are integrated with each other, for example, by joining by welding. The busbar lead wire 50c of each output busbar 50 protrudes from within the busbar accommodating recess 43 through the cover portion 44 toward the circuit board 31 and is soldered to the circuit board 31. Each output busbar 50 is disposed at a position where it overlaps with a portion of the circuit board 31 where the control circuit 34 is mounted, in the stacking direction X1 of the circuit board 31 and the holder 40.

[0037] The holder main body 41 has three terminal insertion holes 41h that communicate with the inside of the busbar accommodating recess 43. For convenience of illustration, only one terminal insertion hole 41h is shown. One end of each terminal insertion hole 41h opens to the bottom surface of the busbar accommodating recess 43, and the other end opens to the second main body surface 41b of the holder main body 41. Each terminal insertion hole 41h is disposed at a position corresponding to the connection terminal 50a of each output busbar 50. The axial direction of each terminal insertion hole 41h coincides with the axial direction of the connection terminal 50a of each output busbar 50.

[0038] The cover portion 44 holds the second metal plate 52, which is a metal plate that blocks noise radiated from each output bus bar 50 toward the circuit board 31. The second metal plate 52 is a thin flat plate. The thickness direction of the second metal plate 52 coincides with the thickness direction of the cover portion 44. The second metal plate 52 is integrated with the cover portion 44 by insert molding. The second metal plate 52 is embedded in the cover portion 44. A portion of the cover portion 44 is disposed between the second metal plate 52 and the circuit board 31. The second metal plate 52 is disposed between each output bus bar 50 and the portion of the circuit board 31 where the control circuit 34 is mounted in the stacking direction X1 of the circuit board 31 and the holder 40. Therefore, the second metal plate 52 is a metal plate disposed between each output bus bar 50 and the portion of the circuit board 31 where the control circuit 34 is mounted.

[0039] Second metal plate 52 has second ground busbar 52a serving as a ground busbar. Second ground busbar 52a is integrally formed with second metal plate 52. Second ground busbar 52a protrudes from a surface of lid 44 opposite to the bottom surface of busbar accommodating recess 43, and is electrically connected to ground pattern 31a.

[0040] The other end of each conductive member 27 can be inserted into and removed from each output bus bar 50 via each terminal insertion hole 41h. Then, the other end of each conductive member 27 passes through each terminal insertion hole 41h and is inserted into each output bus bar 50, whereby each conductive member 27 and each output bus bar 50 are electrically connected to each other.

[0041] The electric motor 17 and the circuit board 31 of the motor control device 30 are electrically connected via the motor wiring 21a, the cluster block 29, the conductive members 27, and the output bus bars 50. Therefore, the conductive members 27 are used to electrically connect the electric motor 17 and the motor control device 30.

[0042] Next, the operation of this embodiment will be described. A DC voltage from an external power supply connected to the connector connection portion 14f is converted to an AC voltage by the switching operation of each switching element 32, and the converted AC voltage is supplied as a drive voltage to the electric motor 17 via each output bus bar 50, each conductive member 27, the cluster block 29, and each motor wiring 21a. This drives the electric motor 17, and the rotation of the rotating shaft 15 accompanying the drive of the electric motor 17 drives the compression section 16, causing the refrigerant to be compressed by the compression section 16.

[0043] The control circuit 34 controls the PWM signal to variably control the duty ratio of the switching operation of each switching element 32. This controls the rotation speed of the electric motor 17. When the control circuit 34 receives information related to the target rotation speed of the electric motor 17 from an air conditioning ECU (not shown), it controls the switching operation of each switching element 32 so that the electric motor 17 rotates at the target rotation speed.

[0044] Noise radiated from capacitor 35 toward circuit board 31 is blocked by first metal plate 51. Specifically, since first metal plate 51 is disposed between capacitor 35 and a portion of circuit board 31 where control circuit 34 is mounted, noise traveling from capacitor 35 toward control circuit 34 is blocked by first metal plate 51. The noise blocked by first metal plate 51 flows to ground via first ground bus bar 51a and ground pattern 31a.

[0045] Furthermore, noise radiated from each output bus bar 50 toward the circuit board 31 is blocked by the second metal plate 52. Specifically, since the second metal plate 52 is disposed between each output bus bar 50 and a portion of the circuit board 31 where the control circuit 34 is mounted, the noise traveling from each output bus bar 50 toward the control circuit 34 is blocked by the second metal plate 52. The noise blocked by the second metal plate 52 flows to the ground via the second ground bus bar 52a and the ground pattern 31a.

[0046] The above embodiment can provide the following effects. (1) Holder 40 holds first metal plate 51 that blocks noise radiated from capacitor 35 toward circuit board 31. Since noise radiated from capacitor 35 toward circuit board 31 is blocked by first metal plate 51, it is possible to prevent circuits and elements on circuit board 31 from being affected by noise, resulting in excellent noise resistance.

[0047] (2) Holder 40 holds second metal plate 52 that blocks noise radiated from each output bus bar 50 toward circuit board 31. With this, noise radiated from each output bus bar 50 toward circuit board 31 is blocked by second metal plate 52, so that the circuits and elements on circuit board 31 can be prevented from being affected by noise, resulting in excellent noise resistance.

[0048] (3) The first metal plate 51 has a first ground bus bar 51a electrically connected to the ground pattern 31a mounted on the circuit board 31. With this, noise blocked by the first metal plate 51 flows to the ground via the first ground bus bar 51a and the ground pattern 31a, thereby suppressing noise radiation from the first metal plate 51. In this manner, the configuration in which the first metal plate 51 has the first ground bus bar 51a is suitable as a configuration for suppressing noise radiation from the first metal plate 51.

[0049] (4) The second metal plate 52 has a second ground bus bar 52a electrically connected to the ground pattern 31a mounted on the circuit board 31. With this, noise blocked by the second metal plate 52 flows to the ground via the second ground bus bar 52a and the ground pattern 31a, thereby suppressing noise radiation from the second metal plate 52. Thus, the configuration in which the second metal plate 52 has the second ground bus bar 52a is suitable as a configuration for suppressing noise radiation from the second metal plate 52.

[0050] (5) A portion of holder main body 41 is disposed between first metal plate 51 and circuit board 31. As a result, even if first metal plate 51 is disposed between each capacitor 35 and a portion of circuit board 31 where control circuit 34 is mounted, insulation between first metal plate 51 and circuit board 31 can be ensured by the portion of holder main body 41.

[0051] (6) A portion of the cover portion 44 is disposed between the second metal plate 52 and the circuit board 31. With this, even if the second metal plate 52 is disposed between each output bus bar 50 and the portion of the circuit board 31 on which the control circuit 34 is mounted, the portion of the cover portion 44 can ensure insulation between the second metal plate 52 and the circuit board 31.

[0052] (7) Even if the capacitor 35 is disposed at a position overlapping the portion of the circuit board 31 where the control circuit 34 is mounted in the stacking direction X1 of the circuit board 31 and the holder 40, the first metal plate 51 prevents the control circuit 34 from being affected by noise from the capacitor 35. This improves the degree of freedom in the layout of the capacitor 35 and the circuit board 31 in the inverter accommodating chamber 14a. In addition, since it is not necessary to dispose the capacitor 35 at a position not overlapping the portion of the circuit board 31 where the control circuit 34 is mounted in the stacking direction X1 of the circuit board 31 and the holder 40 in order to prevent the control circuit 34 from being affected by noise from the capacitor 35, the electric compressor 10 can be made smaller.

[0053] (8) Even if each output bus bar 50 is disposed at a position where it overlaps with the portion of the circuit board 31 where the control circuit 34 is mounted in the stacking direction X1 of the circuit board 31 and the holder 40, the second metal plate 52 prevents the control circuit 34 from being affected by noise from each output bus bar 50. This improves the degree of freedom in the layout of the output bus bars 50 and the circuit board 31 in the inverter accommodating chamber 14a. In addition, since it is not necessary to dispose each output bus bar 50 at a position where it does not overlap with the portion of the circuit board 31 where the control circuit 34 is mounted in the stacking direction X1 of the circuit board 31 in order to prevent the control circuit 34 from being affected by noise from each output bus bar 50, the electric compressor 10 can be made smaller.

[0054] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0055] In the above embodiment, the first ground bus bar 51a does not have to be integrally formed with the first metal plate 51. For example, the first ground bus bar 51a may be joined to the first metal plate 51 by welding.

[0056] In the above-mentioned embodiment, the second ground bus bar 52a does not have to be integrally formed with the second metal plate 52. For example, the second ground bus bar 52a may be joined to the second metal plate 52 by welding.

[0057] In the above embodiment, the first metal plate 51 may be embedded in the holder body 41 by being insert molded into the holder body 41 . In the above embodiment, the second metal plate 52 may be attached to the cover portion 44 by, for example, bolts.

[0058] In the above-mentioned embodiment, for example, each output bus bar 50 may be modularized in the holder 40 by insert molding. In the above-mentioned embodiment, for example, a holder for holding the capacitor 35 and a holder for holding each of the output bus bars 50 may be separate components.

[0059] In the embodiment, the capacitor 35 may be, for example, an electrolytic capacitor. In the above embodiment, the capacitor 35 is given as an example of a filter element. However, the present invention is not limited to this. For example, a coil may be given as an example of a filter element.

[0060] In the embodiment, the first metal plate 51 blocks noise traveling from the capacitor 35 to the control circuit 34, but this is not limited to the above. The first metal plate 51 may be held in the holder 40 so as to block noise traveling from the capacitor 35 to circuits or elements on the circuit board 31 other than the control circuit 34.

[0061] In the embodiment, the second metal plate 52 blocks noise traveling from each output bus bar 50 to the control circuit 34, but this is not limited to the above. The second metal plate 52 may be held in the holder 40 so as to block noise traveling from each output bus bar 50 to circuits or elements other than the control circuit 34 on the circuit board 31.

[0062] In the above embodiment, for example, a cylindrical cover member with a bottom may be attached to the bottom wall 13a of the motor housing 13, so that the inverter accommodating chamber 14a is defined by the bottom wall 13a of the motor housing 13 and the cover member.

[0063] In the embodiment, the electric compressor 10 may be configured, for example, such that the motor control device 30 is disposed radially outward of the rotating shaft 15 with respect to the housing 11. In other words, the compression unit 16, the electric motor 17, and the motor control device 30 do not have to be arranged side by side in this order in the axial direction of the rotating shaft 15.

[0064] In the above-mentioned embodiment, the compression section 16 is not limited to a scroll type, and may be, for example, a piston type or a vane type. In the embodiment, the electric compressor 10 constitutes the vehicle air conditioning device 23. However, the present invention is not limited to this. For example, the electric compressor 10 may be mounted on a fuel cell vehicle and compress air, which is a fluid supplied to the fuel cell, by the compression unit 16. [Explanation of symbols]

[0065] 10...electric compressor, 11...housing, 16...compression section, 17...electric motor, 27...conductive member, 30...motor control device, 31...circuit board, 31a...ground pattern, 35...capacitor as filter element, 40...holder, 50...output bus bar, 51...first metal plate which is a metal plate, 51a...first ground bus bar as a ground bus bar, 52...second metal plate which is a metal plate, 52a...second ground bus bar as a ground bus bar.

Claims

1. A compression section that compresses the fluid; an electric motor that drives the compression unit; a motor control device that drives the electric motor and has a circuit board on which a filter element is mounted to reduce noise contained in an input current from an external source; a housing that accommodates the motor control device therein; a conductive member that penetrates the housing and electrically connects the electric motor and the motor control device; an output bus bar that electrically connects the conductive member and the circuit board; a resin holder that incorporates the output bus bar and is accommodated in the housing, the circuit board and the holder are fixed to the housing, the output bus bar includes a cylindrical connection terminal connected to the conductive member, a bus bar lead wire connected to the circuit board, and a bus bar connection portion connecting the connection terminal and the bus bar lead wire, the holder is formed with a bus bar accommodating recess in which the output bus bar is accommodated, the holder has a lid portion that closes an opening of the bus bar accommodating recess, The lid portion is made of resin and has a plate shape, the cover portion holds a metal plate that blocks noise radiated from the output bus bar toward the circuit board, The metal plate is embedded in the lid portion, The metal plate has a thin flat plate shape and is integrated with the lid portion by insert molding, A plurality of switching elements that drive the electric motor and a control circuit that controls switching operations of the plurality of switching elements are mounted on the circuit board, the output bus bar is disposed at a position overlapping a portion of the circuit board on which the control circuit is mounted in a stacking direction of the circuit board and the holder, the metal plate is disposed between the connection terminal and the bus bar coupling portion, and a portion of the circuit board on which the control circuit is mounted, a portion of the lid portion is disposed between the metal plate and the circuit board, The other portion of the cover is disposed between the metal plate and a terminal pin connected to the connection terminal.

2. 2. The electric compressor according to claim 1, wherein the metal plate has a ground bus bar that is electrically connected to a ground pattern mounted on the circuit board.

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