ELECTRIC COMPRESSOR

Abstract

An electric compressor (1), with: a control device (4) which is accommodated in a receiving section (9) formed in a housing (3), wherein the receiving section (9) is closed by a cover element (12) which forms part of the housing (3), and wherein an earthing pattern (26, 27, 28) formed in the control device (4) is conductively connected to the cover element (12) or a wall of the receiving section (9) in the vicinity of the earthing pattern (26, 27, 28), and wherein the grounding pattern (26, 27, 28) is conductively connected to the cover element (12) or the wall of the receiving portion (9) in the vicinity of the grounding pattern (26, 27, 28) by a conductive, elastic grounding material (67, 68).

Description

Technical area

[0001] The present invention relates to an electric compressor having a control unit accommodated in a receiving portion of a housing. State of the art

[0002] Due to the current global environmental problems, hybrid cars and electric vehicles have been developed in recent years. However, in the air conditioning systems for these vehicles, instead of engine-driven compressors, electric compressors, each with a motor, are used. In this case, the vehicle is equipped with a high-voltage power supply consisting of a high-voltage battery of approximately 300 V, for example, and a low-voltage power supply consisting of a conventional battery of approximately 12 V. The voltage obtained by converting the DC voltage of the high-voltage power supply into AC voltage using an inverter circuit, is supplied to the motor of the electric compressor via a control unit. A voltage (e.g.15 V or the like), which is obtained by switching a DC voltage of the low-voltage power supply, is supplied to the control unit as a power supply.

[0003] Therefore, a high-voltage side circuit pattern and a low-voltage side circuit pattern, independent of the high-voltage side circuit pattern, are configured on a control unit circuit board. Furthermore, a housing section was formed on the outer surface of a casing (shell) of the electric compressor, and the control unit circuit boards were housed in this housing section.

[0004] On the other hand, a measure has been taken to ground each of the ground patterns on the high-voltage side and the low-voltage side by conductively connecting each of the ground patterns to the case (GND) via a capacitor (Y capacitor: line bypass capacitor) using any board fixing screw, thereby reducing EMI noise generated by switching in an inverter circuit or the like (see, for example, Patent Document 1). Patent Document 3 discloses a motor-driven compressor including a case housing a compression mechanism and an electric motor, a drive circuit unit controlling the electric motor, a cover body covering the drive circuit unit, and a shield. The drive circuit unit includes a multilayer board having a ground layer and electronic components mounted on the multilayer board.The shield encloses at least some of the electronic components and is electrically connected to the ground layer of the multilayer board. Patent Document 4 discloses a board mounting device for vehicle installation, including a board mounted with electronic components, a non-conductive housing covering one surface of the board, and a conductive back cover covering the other surface of the board. The board mounting device further includes a shielding object circuit disposed on the other surface of the board and intended to be shielded from external noise, and a peripheral electrode circumferentially disposed on the board around the outer edge portion of the board and surrounding the shielding object circuit. The peripheral electrode and the back cover contact each other and are electrically connected to extend around the outer edge of the board. Document listPatent documents Patent document 1: JP 3 473 853 B2 Patent document 2: JP 5 289 697 B2 Patent document 3: DE 10 2016 102 724 A1 Patent document 4: DE 21 2013 000 221 U1 Summary of the inventionProblems to be solved by the invention

[0005] However, a problem arises in that when the grounding pattern of the circuit board is conductively connected to the case by the circuit board fixing screw as in the prior art, the screw has a structure that is screwed into a metal column protruding from the bottom wall of the receiving portion, which results in the distance to the case becoming longer, the impedance with respect to the potential of the case cannot be sufficiently reduced, and thus a noise suppression effect is hindered.

[0006] Furthermore, there is the problem that the grounding potential of the board is not stabilized because other screws for fastening the board, which are not conductively connected to the grounding pattern, fall completely out of the grounding pattern of the board.

[0007] The present invention was conceived to solve such conventional technical problems, and an object thereof is to provide an electric compressor capable of achieving an effective and stable noise reduction effect by conductively connecting a ground pattern (ground) of a control device to a housing at a short distance. This object is achieved by an electric compressor according to one of claims 1 or 3. Advantageous embodiments are subject to the dependent claims. Advantageous effect of the invention

[0008] According to the present invention, in an electric compressor configured such that a control device is housed in a housing portion formed in a casing, and the housing portion is closed by a cover member forming part of the casing, a ground pattern configured in the control device is conductively connected to the cover member or a wall of the housing portion near the ground pattern. Therefore, the ground pattern of the control device can be connected to the casing at a shorter distance than before. This makes it possible to sufficiently reduce the impedance with respect to the potential of the casing and achieve a high noise reduction effect.

[0009] In this case, the grounding pattern in the peripheral portion of the receiving portion is located near a side wall of the receiving portion, and the grounding pattern in the central portion of the receiving portion is far from the side wall. However, since the cover member or a bottom wall of the receiving portion is located nearby, as in the invention according to claim 2, the grounding pattern located in the peripheral portion of the receiving portion is connected to the side wall of the receiving portion, and the grounding pattern located in the central portion of the receiving portion is connected to the cover member or the bottom wall of the receiving portion, thereby making it possible to connect the grounding patterns of the control device to the housing with the shortest pitch or a short pitch depending on the position in the receiving portion.

[0010] Furthermore, the control unit is secured to the housing with a screw, with the screw protruding from the control unit. Therefore, as in the invention according to claim 3, for example, the screw is conductively connected to the grounding pattern and conductively connected to the cover member or the wall of the receiving portion near the grounding pattern, thereby easily connecting the grounding pattern of the control unit to the housing.

[0011] Specifically, in the invention according to claim 4, when the control device is fixed to the housing with a plurality of the screws, each of the screws is conductively connected to the grounding pattern, and the screw located in the edge portion of the receiving portion is conductively connected to the side wall of the receiving portion, and the screw located in the central portion of the receiving portion is conductively connected to the cover member or the bottom wall of the receiving portion, whereby the respective screws can be smoothly conductively connected to the housing at the shortest distance or short distance, and further, the stabilization of a grounding potential of the control device can also be achieved.

[0012] Furthermore, as in the invention according to claim 5, when the grounding pattern is conductively connected to the cover part or the wall of the receiving portion near the grounding pattern by a conductive grounding material having elasticity, the grounding pattern of the control device can be reliably conductively connected to the cover part or the wall of the receiving portion near the grounding pattern. Specifically, as in the inventions according to claims 3 and 4, when the screw is used to fix the control device to the housing, the grounding material can be brought into contact with the screw, or the grounding material can be fixed to the control device by the screw and conductively connected thereto, so that the grounding pattern can be more reliably and effectively conductively connected to the housing.

[0013] Furthermore, as in the invention according to claim 6, when the ground pattern is conductively connected to the cover member or the wall of the accommodating portion in the vicinity of the ground pattern through a Y capacitor, an extremely high EMI noise suppression effect can be realized.

[0014] In this case, as in the invention according to claim 7, when the ground pattern is conductively connected to the cover member or the wall of the accommodating portion in the vicinity of the ground pattern via a plurality of the Y capacitors corresponding to a frequency band of the noise to be reduced based on noise regulation value characteristics, it is possible to make appropriate adjustment according to the noise frequency band and achieve a higher EMI noise reduction effect. Brief description of the drawings Fig. 1 is a perspective view of an electric compressor of an embodiment to which the present invention is applied; Fig. 2 is a schematic block diagram of an electrical circuit of the Fig. 1 electric compressor; Fig. 3 is a plan view of the electric compressor of Fig. 1 with a cover element removed therefrom, seen from one side of the receiving section; Fig. 4 is a sectional view along the line AA of Fig. 3; Fig. 5 is a sectional view along the line BB of Fig. 3; Fig. 6 is a view showing the structure of a screw portion of a board made of Fig. 3 describes; and Fig. 7 is a sectional view showing an accommodating portion of an electric compressor of another embodiment of the present invention. Mode for carrying out the invention

[0015] Embodiments of the present invention will be described in detail below with reference to the drawings. In the drawings, reference numeral 1 denotes a so-called inverter-integrated electric compressor, which is mounted on a vehicle, such as an electric vehicle or a hybrid vehicle, and forms a refrigerant circuit of a vehicle air conditioner for air conditioning a vehicle interior, and which includes a motor 2 (shown in Fig. 2), a housing 3 made of metal (conductive metal such as aluminum or iron, in the embodiment aluminum) containing therein a compression mechanism (not shown) driven by the motor 2, and a control unit 4 (shown in Fig. 2) which supplies the motor 2 with energy to drive it.

[0016] The housing 3 comprises a motor housing 6 containing the motor 2 therein, a compression mechanism housing 7 connected to one side of the motor housing 6 in its axial direction and containing the compression mechanism, a compression mechanism cover 8 closing an opening on one side of this compression mechanism housing 7, a receiving portion 9 (in Fig. 3) formed on the outer surface of the motor housing 6 on the other side thereof in the axial direction, and a cover member 12 that closes an opening 11 on the other side of the accommodation portion 9 so that it can be opened and closed. After the control device 4 is housed in the accommodation portion 9, the accommodation portion 9 is closed by the cover member 12, and the cover member 12 is detachably fixed to the motor housing 6 by screws 13. That is, in the present invention, the cover member 12 is also a part of the housing 3 and is also made of a metal (a conductive metal such as aluminum or iron. In the embodiment, aluminum).

[0017] Furthermore, the electric compressor 1 of the embodiment in the Fig. 1 and Fig. 3 with the receiving section 9 upwards and the compression mechanism cover 8 downwards, but is in reality arranged in the lateral direction so that the compression mechanism cover 8 is on one side and the receiving section 9 on the other side.

[0018] The motor 2 of the embodiment is composed of a three-phase synchronous motor (brushless DC motor), and the compression mechanism is, for example, a scroll-type compression mechanism. The compression mechanism is driven by the motor 2 to compress a refrigerant and discharge it into the refrigerant cycle. Subsequently, a low-temperature refrigerant gas, which is sucked in by an evaporator (also called a heat absorber), which also forms part of the refrigerant cycle, flows through the motor housing 6. This cools the interior of the motor housing 6. Then, the accommodation portion 9 is separated from the interior of the motor housing 6, in which the motor 2 is housed, by a partition wall 14 formed in the motor housing 6 (housing 3) (which is shown in Fig. 4 and Fig. 5, the bottom wall of the receiving section 9 is separated. The partition wall 14 is also cooled by the low-temperature refrigerant gas.

[0019] Furthermore, the vehicle is equipped with a high-voltage (HV) power supply 21, consisting of a high-voltage battery of approximately DC 300V for supplying power and driving the motor 2 of the electric compressor 1 and a motor (not shown) for driving, and a low-voltage (LV) power supply 22, consisting of a battery of approximately DC 12V. Furthermore, the housing 3 of the electric compressor 1 is conductively connected to a vehicle body (ground / grounding).

[0020] The control unit 4 consists, for example, of a control board 17 and an HV filter board (EMI filter) 18. This control board 17 and the HV filter board 18, which form the control unit 4, are housed in the receiving section 9, which is arranged on the outer surface of the housing 3 (motor housing 6) on the other side thereof, as shown in Fig. 3. The DC voltage from the high-voltage power supply 21 is supplied to the control board 17 via the HV filter board 18. The control board 17 is equipped with an inverter circuit. The inverter circuit supplies the DC voltage from the high-voltage power supply 21 as AC current to the motor 2 to operate the motor 2.

[0021] Furthermore, the control board 17 is also supplied with the DC voltage of the low-voltage power supply 22. The control board 17 is equipped with a switching power supply with a switching transformer (isolation transformer). The switching power supply switches the voltage of the low-voltage power supply 22 to generate a voltage for driving the gate of the inverter circuit (e.g., DC 15V) and a supply voltage for the control unit 4 itself (e.g., DC 5V).

[0022] That is, on the control board 17, a circuit pattern on the high-voltage side and a circuit pattern on the low-voltage side are formed independently of the circuit pattern on the high-voltage side. Therefore, a grounding pattern 26 for the high voltage and a grounding pattern 27 for the low voltage are formed on the control board 17, which are isolated ( Fig. 3). In addition, a grounding pattern 28 for high voltage is also formed on the HV filter board 18 ( Fig. 3).

[0023] Furthermore, the control board 17 is secured to the housing 3 (motor housing 6) from the side of the opening 11 with several screws 31 to 37 (seven in the embodiment). The HV filter board 18 is also secured to the housing 3 from the side of the opening 11 with several screws 41 to 45 (five in the embodiment). The screw heads of the screws 31 to 37 and 41 to 45 protrude from the boards 17 and 18 in the direction of the cover element 12.

[0024] Fig. Figure 4 shows a cross section of a screw section 41 that fastens the HV filter board 18 (cross section along the line AA in Fig. 3), and Fig. Figure 5 shows a cross section of a screw portion 31 that fixes the control board 17 (cross section along the line BB in Fig. 3). Incidentally, each drawing shows a state in which the receiving portion 9 is closed by the cover member 12. Each of the screws 31 to 37 and 41 to 45 penetrates each of the circuit boards 17 and 18, and each of them is screwed to a screw fixing column (metal column) 51 that stands upright integrally with the partition wall 14. Accordingly, the screws 31 to 37 and 41 to 45 are conductively connected to the casing 3 (motor casing 6).

[0025] Furthermore, in the embodiment, the screws 31 to 35, 37, and 42 to 45 are arranged in the edge portion of the receiving portion 9. Accordingly, each of the screws 31 to 35, 37, and 42 to 45 is arranged near a side wall 3A (wall constituting the receiving portion 9) of the receiving portion 9, and the distance therebetween is assumed to be smaller than the vertical dimension of the column 51 in the embodiment. Incidentally, the edge portions of the grounding patterns 26 to 28 on the side wall 3A side, which become the sides of these screws 31 to 35, 37, 42 to 45, are close to the side wall 3A. Furthermore, in this embodiment, the side wall 3A is formed as a part of the housing 3 (motor housing 6). On the other hand, the screws 36 and 41 are located in the center of the receiving portion 9.Therefore, the screws 36 and 41 are separated from the side wall 3A, but the distance between each of the screws 36 and 41 and the cover member 12 is assumed to be smaller than the vertical dimension of the column 51.

[0026] Furthermore, screws 31, 32, 36, and 37 are each connected to the high-voltage grounding pattern 26 of the control board 17 via Y capacitors 52 to 55. Screws 41 to 45 are each connected to the grounding pattern 28 of the HV filter board 18 via Y capacitors 56 to 60. Furthermore, screw 41 is conductively connected to the grounding pattern 28 via a grounding pattern 61 and the Y capacitor 56.

[0027] On the other hand, screws 33 to 35 are each conductively connected to the low-voltage grounding pattern 27 of the control board 17 via grounding patterns 62 to 64. This means that all screws 31 to 37 for securing the control board 17 to the housing 3 are conductively connected to the grounding pattern 26 and the grounding pattern 27, respectively. All screws 41 to 45 for securing the HV filter board 18 to the housing 3 are also conductively connected to the grounding pattern 28.

[0028] Here shows Fig. 6 shows the structure of the control board 17 in the area of the screw 31, e.g., in a plane (top) and a cross-section (bottom). In this embodiment, the control board 17 has a four-layer structure from L1 to L4. The high-voltage grounding patterns 26 of the respective phases L1 to L4 are conductively connected at mutually facing locations with a number of vias 66 along the shortest possible path. Such a structure is also considered the same for the low-voltage grounding pattern 27.

[0029] In addition, several (in this embodiment, two) Y-capacitors 52A and 52B are provided in parallel between the column 51, to which the screw 31 is screwed, and the grounding pattern 26. These parallel Y-capacitors 52A and 52B form the Y-capacitor 52 in Fig. 3. Each of the Y capacitors 52A and 52B has a capacitance corresponding to the frequency band of the noise to be reduced based on the noise control value characteristics. In this embodiment, the Y capacitor 52A is provided for low frequencies, and the Y capacitor 52B for high frequencies. Consequently, the grounding pattern 26 is conductively connected to the screw 31 screwed to the column 51 via the parallel Y capacitors 52A and 52B. Incidentally, such a structure is also used for the other screws 32, 36, and 37 and Y capacitors 53, 54, and 55, as well as the screws 41 to 45 and the Y capacitors 56 to 60 of the HV filter board 18 in Fig. 3 are considered equal.

[0030] In this embodiment, each of the screws 36 and 41 located in the center of the receiving section 9 is then connected to the cover element 12 by a finger 67, as shown in Fig. 4. Each of the screws 31 to 35, 37 and 42 to 45 located in the edge portion of the receiving portion 9 is connected to the side wall 3A by a seal 68, as shown in Fig. 5 shown.

[0031] Each of the fingers 67 is a conductive elastic grounding material, and they are attached to the inner surface of the cover member 12 (the surface on the side of the receiving portion 9) in advance according to the positions of the screws 36 and 41, respectively. Thus, when the receiving portion 9 is closed by the cover member 12, the finger 67 abuts and contacts the screw head of each of the screws 36 and 41, conductively connecting the cover member 12 and each of the screws 36 and 41.

[0032] Thus, the high-voltage grounding pattern 26 of the control board 17, located in the center of the receiving section 9, and the grounding pattern 28 of the HV filter board 18 are connected to the cover member 12 by the screws 36 and 41 and the fingers 67. However, as described above, since the distance between each of the screws 36 and 41 and the cover member 12 is smaller than the vertical dimension of the column 51, each of the grounding patterns 26 and 28 is conductively connected to the cover member 12 (housing 3) at the shortest distance in the embodiment.

[0033] On the other hand, the gasket 68 is a member that seals between the side wall 3A of the receiving portion 9 and the cover member 12 and serves as a conductive grounding material with elasticity. In the embodiment, only the portions corresponding to the respective screws 31 to 35, 37, and 42 to 45 protrude and extend inward, and are tightened and fixed to the respective grounding patterns 26, 27, and 28 by the screws 31 to 35, 37, and 42 to 45, and are conductively connected thereto. Thus, the side wall 3A and the respective screws 31 to 35, 37, and 42 to 45 are conductively connected.

[0034] Thus, the high-voltage grounding pattern 26 and the low-voltage grounding pattern 27 of the control board 17, located in the edge portion of the receiving portion 9, and the grounding pattern 28 of the HV filter board 18 are connected to the side wall 3A by the screws 31 to 35, 37, and 42 to 45 and the gaskets 68. However, as described above, since the distance between each of the screws 31 to 35, 37, and 42 to 45 and the side wall 3A is smaller than the vertical dimension of the column 51, each of the grounding patterns 26 to 28 is conductively connected to the side wall 3A (case 3) at a shorter distance than when the gasket 68 is not used (where conduction occurs only through the column 51).

[0035] Furthermore, the screws 31 to 35, 37 and 42 to 45 can also be brought into contact with the cover element 12 by the fingers 67, without this being dependent on this embodiment. In particular, in the example of Fig. 5, since the screw 31 is closer to the cover part 12 than the side wall 3A, the finger 67 can be brought into contact with the cover part 12 in a similar way to the screws 36 and 41 in order to be conductively connected thereto.

[0036] As described above, in the present invention, the grounding patterns 26 to 28 formed on the control board 17 and the HV filter board 18 of the control device 4 are conductively connected to the cover member 12 or the side wall 3A of the housing portion 9 in the vicinity of the grounding patterns 26 to 28. Therefore, the grounding patterns 26 to 28 of the control board 17 and the HV filter board 18 of the control device 4 can be conductively connected to the housing 3 at a shorter distance than before. This makes it possible to sufficiently reduce the impedance with respect to the potential of the housing 3 and achieve a high noise suppression effect.

[0037] Here, as in the embodiment, the grounding patterns 26 to 28 located in the edge portion of the accommodating portion 9 are close to the side wall 3A of the accommodating portion 9, and the grounding patterns 26 and 28 located in the center of the accommodating portion 9 are far from the side wall 3A. However, when the cover member 12 is located nearby, the grounding patterns 26 to 28 located in the edge portion of the accommodating portion 9 are connected to the side wall 3A, and the grounding patterns 26 and 28 located in the center of the accommodating portion 9 are connected to the cover member 12, thereby making it possible to smoothly connect the grounding patterns 26 to 28 of the control board 17 and the HV filter board 18 to the housing 3 with the shortest distance or a short distance depending on the position in the accommodating portion 9.

[0038] Furthermore, as in the embodiment, when the control board 17 and the HV filter board 18 of the control device 4 are fixed to the housing 3 with the screws 31 to 37 and 41 to 45, these screws 31 to 37 and 41 to 45 protrude from the boards 17 and 18. The screws 31 to 37 and 41 to 45 are therefore conductively connected to the ground patterns 26 to 28 and are conductively connected to the cover member 12 and the side wall 3A, respectively, so that the ground patterns 26 to 28 of the respective boards 17 and 18 can be easily connected to the housing 3.

[0039] Specifically, as in the embodiment, when the control board 17 and the HV filter board 18 of the control device 4 are fixed to the housing 3 with the plurality of screws 31 to 37 and 41 to 45, the screws 31 to 37 and 41 to 45 are connected to the grounding patterns 26 to 28, the screws 31 to 35, 37, and 42 to 45 located in the edge portion of the receiving portion 9 are connected to the side wall 3A, and the screws 36 and 41 located in the center of the receiving portion 9 are conductively connected to the cover member 12, whereby the screws 31 to 37 and 41 to 45 can be smoothly conductively connected to the housing 3 at the shortest distance or the short distance, and further, the stabilization of the ground potential of each of the boards 17 and 18 can also be achieved.

[0040] Furthermore, as in the embodiment, the grounding patterns 26 to 28 of the control board 17 and the HV filter board 18 can be reliably connected to the cover member 12 and the side wall 3A, respectively, when the grounding patterns 26 to 28 are reliably conductively connected to the cover member 12 and the side wall 3A, respectively, by the fingers 67 or the gaskets 68 (conductive grounding material having elasticity). Specifically, as in the embodiment, when the screws 31 to 37 and 41 to 45 are used to fix the respective circuit boards 17 and 18 for conduction to the housing 3, the fingers 67 (grounding materials) can be brought into contact with the screws 36 and 41 or the gaskets 68 (grounding materials) can be fixed and conductively connected to the circuit boards 17 and 18 by the screws 31 to 35, 37 and 42 to 45, so that the grounding patterns 26 to 28 can be conductively connected to the housing 3 more reliably and effectively.

[0041] Furthermore, as in the embodiment, when the control device 4 is connected to the high-voltage power supply 21 and the low-voltage power supply 22, and both the high-voltage ground pattern 26 and the low-voltage ground pattern 27 are arranged on the control board 17 and the high-voltage ground pattern 28 is arranged on the HV filter board 18, an extremely high EMI noise suppression effect can be achieved if the high-voltage ground patterns 26 and 28 are connected to the cover member 12 or the side wall 3A via the Y capacitors 52 to 60.

[0042] In this case, as in the embodiment, if the grounding patterns 26 and 28 are conductively connected to the cover member 12 or the side wall 3A via the plurality of Y capacitors 52A and 52B corresponding to the frequency band of the noise to be reduced based on the noise regulation value characteristics, it is possible to perform appropriate matching according to the noise frequency band and achieve a higher EMI noise reduction effect. That is, in the structure of the embodiment, a noise reduction effect of about 5 dB was achieved in the entire frequency band of 30 to 300 MHz of a Biconi antenna.

[0043] Incidentally, in the embodiment, the grounding patterns 26 to 28 are conductively connected to the cover member 12 or the side wall 3A via the screws 31 to 37 and 41 to 45, respectively, but the inventions other than claims 3 and 4 are not limited to this. The respective grounding patterns 26 to 28 may be conductively connected directly to the cover member 12 or the side wall 3A via the fingers or the gaskets shown in the embodiment.

[0044] Furthermore, in this embodiment, the high-voltage grounding patterns 26 and 28 are connected to the cover member 12 or the side wall 3A via the Y capacitors 52 to 60. However, the low-voltage grounding pattern 27 may also be connected to the cover member 12 or the side wall 3A via the Y capacitor to achieve EMI noise reduction.

[0045] In addition, the Fig. 4 and Fig. In the embodiment shown in Fig. 5, the side wall 3A is arranged on the motor housing 6 side of the housing 3, and the receiving portion 9 is arranged inside the side wall 3A, and the receiving portion 9 is closed by the flat, plate-like cover member 12. However, a structure may also be adopted in which side walls are formed on both the cover member 12 side and the motor housing 6 side, and both sides form the side wall of the receiving portion 9. In this case, the side wall of the receiving portion 9 corresponds to the side wall of the cover member 12 and the side wall of the motor housing 6.

[0046] Alternatively, a structure may be provided in which the side wall is formed only on the cover member 12, and the motor housing 6 of the casing 3 has no side wall. In this case, only the position of the receiving portion 9 on the outer surface of the other side of the motor housing 6 in the axial direction is fixed, and the space surrounded by the cover member 12 (contained in a part of the casing 3) and the motor housing 6 in a state where the cover member 12 is fixed to the motor housing 6 becomes the receiving portion 9. Furthermore, the side wall of the receiving portion 9 also serves as the side wall of the cover member 12.

[0047] In addition, Fig. 7 the structure of another embodiment of a section according to Fig. 4. In this embodiment, a structure is provided in which the control unit 4 (the part of the HV filter board 18 is in Fig.7) is attached to the side of the cover member 12. Incidentally, in this example, as described above, the side wall of the receiving portion 9 is formed by the side wall of the cover member 12 and the side wall of the motor housing 6.

[0048] With such a structure, since the screw head of the screw 41 (the ground pattern 28) faces downward, the wall of the receiving portion 9 near the screw 41 becomes a bottom wall 3B of the receiving portion 9 (a part of the motor housing 6). Therefore, in this case, the finger 67 is fixed to the bottom wall 3B, and when the receiving portion 9 is closed by the cover member 12, the finger 67 abuts and contacts the screw head of the screw 41, so that the bottom wall 3B and the screw 41 are conductively connected. Even with such a structure, the ground patterns 26 to 28 of the control board 17 and the HV filter board 18 can be easily conductively connected to the housing 3 via the shortest route or at a short distance. Description of reference numbers 1 electric compressor 2 engines 3 housings 3A side wall 3B lower wall 4 Control unit 6 Engine housing 9 Recording section 12 Cover element 17 Control board 18 HV filter board 21 High-voltage power supply 22 Low-voltage power supply 26 to 28 grounding patterns 31 to 37, 41 to 45 screw 52 to 60, 52A, 52B Y capacitor 67 fingers (grounding material) 68 Gasket (grounding material).

Claims

[1] An electric compressor (1), with: a control device (4) which is accommodated in a receiving section (9) formed in a housing (3), wherein the receiving section (9) is closed by a cover element (12) which forms part of the housing (3), and wherein an earthing pattern (26, 27, 28) formed in the control device (4) is conductively connected to the cover element (12) or a wall of the receiving section (9) in the vicinity of the earthing pattern (26, 27, 28), and wherein the grounding pattern (26, 27, 28) is conductively connected to the cover element (12) or the wall of the receiving portion (9) in the vicinity of the grounding pattern (26, 27, 28) by a conductive, elastic grounding material (67, 68). [2] The electric compressor (1) according to claim 1, wherein the grounding pattern (26, 27, 28) is conductively connected to the cover member (12) or the wall of the accommodating portion (9) in the vicinity of the grounding pattern (26, 27, 28) through a Y capacitor (52-60, 52A, 52B). [3] An electric compressor (1), with: a control device (4) which is accommodated in a receiving section (9) formed in a housing (3), wherein the receiving section (9) is closed by a cover element (12) which forms part of the housing (3), and wherein an earthing pattern (26, 27, 28) formed in the control unit (4) is conductively connected to the cover element (12) or a wall of the receiving section (9) in the vicinity of the earthing pattern (26, 27, 28), wherein the grounding pattern (26, 27, 28) is conductively connected to the cover element (12) or the wall of the receiving portion (9) in the vicinity of the grounding pattern (26, 27, 28) by a Y capacitor (52 - 60, 52A, 52B). [4] The electric compressor (1) according to any one of claims 2 or 3, wherein the grounding pattern (26, 27, 28) is conductively connected to the cover member (12) or the wall of the accommodating portion (9) in the vicinity of the grounding pattern (26, 27, 28) through a plurality of Y capacitors (52-60, 52A, 52B) corresponding to a frequency band of the noise to be reduced based on noise regulation value characteristics. [5] The electric compressor (1) according to any one of claims 1 to 4, wherein the grounding pattern (26, 27, 28) arranged in an edge portion of the accommodating portion (9) is conductively connected to a side wall (3a) of the accommodating portion (9), and wherein the grounding pattern (26, 27, 28) located in the central portion of the accommodating portion (9) is conductively connected to the cover member (12) or a bottom wall (3b) of the accommodating portion (9). [6] The electric compressor (1) according to any one of claims 1 to 5, comprising a screw (31-37, 41-45) for fixing the control device (4) to the housing (3), the screw (31-37, 41-45) being conductively connected to the grounding pattern (26, 27, 28) and being conductively connected to the cover member (12) or the wall of the receiving portion (9) in the vicinity of the grounding pattern (26, 27, 28). [7] The electric compressor (1) according to claim 6, comprising a plurality of said screws (31 - 37, 41 - 45), wherein each of the screws (31 - 37, 41 - 45) is conductively connected to the earthing pattern (26, 27, 28), wherein the screw (31 - 37, 41 - 45) located in the edge portion of the receiving portion (9) is conductively connected to the side wall (3a) of the receiving portion (9), and wherein the screw (31 - 37, 41 - 45) located in the central portion of the receiving portion is conductively connected to the cover element (12) or the bottom wall (3b) of the receiving portion (9).

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