JP2008128142A - Inverter-integrated electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inverter-integrated electric compressor enhancing vibration resistance of an inverter apparatus integrally assembled with a housing of the electric compressor without degrading cooling performance, reduction in weight and assemble property. <P>SOLUTION: An inverter-integrated electric compressor 1 has the inverter apparatus 22 integrated with an inverter storage part 11 of the housing 3. The inverter apparatus 22 includes a metal plate 23 secured in an inverter storage part 11; a plurality of power semiconductor switching elements 24 mounted on the metal plate 23; a power substrate 25 on which a power-related control circuit for operating the power semiconductor switching elements 24 is mounted; and a bus bar assembly 26 formed by integrating a plurality of bus bars with an insulating material. The metal plate 23 includes a protrusion part 33 extending in a width direction perpendicular to a motor shaft direction L of an electric motor of the compressor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inverter-integrated electric compressor suitable mainly for use in a vehicle air conditioner.

In recent years, in the automobile industry, in order to respond to the energy environment, development and introduction of vehicles that use electric power, such as hybrid cars, electric cars, and fuel cell cars, have progressed at a rapid pace. It has been.
On the other hand, unlike conventional air conditioners, these vehicles are equipped with an air conditioner including an electric compressor driven by an electric motor powered by electricity.
Further, the above electric compressor is a hermetic type electric compressor in which a compressor and an electric motor are incorporated in a housing, and converts DC power from a power source into three-phase AC power via an inverter device. Thus, an electric compressor that can supply power to the electric motor and variably control the rotation speed of the compressor according to the air conditioning load is employed.

Inverter-driven electric compressors, many inverter-integrated electric compressors having a configuration in which an inverter device is integrated into a housing of an electric compressor have been proposed.
Further, as the inverter-integrated electric compressor, a metal base plate, a power semiconductor module, a smoothing capacitor, a bus bar assembly, and a printed board are integrally formed in advance as an inverter assembly, and the base plate of the inverter assembly is electrically driven. There has been known one in which an inverter device is assembled to an electric compressor by fastening to an upper surface of the outer periphery of a housing of the compressor (see, for example, Patent Document 1).

JP 2004-190547 A

By the way, as described above, when the inverter device is integrated into the outer periphery of the housing of the electric compressor, cooling of the power semiconductor module configured by a heating element such as an IGBT (Insulated Gate Bipolar Transistor) used for the inverter device; Vibration resistance against vibration propagated from the vehicle side is an issue.
The heat generating element is cooled by using the metal base plate (aluminum plate) as a heat sink and utilizing the heat absorption action of the low-temperature intake refrigerant gas flowing inside the housing of the electric compressor.
In terms of vibration resistance, from the viewpoint of cost and weight reduction, an aluminum alloy thick plate is used for the metal base plate, and the aluminum alloy thick plate is firmly screwed to the housing side at multiple locations (usually 4 locations). However, a method of improving the natural frequency by exclusively increasing the rigidity is employed.

However, when the inverter-integrated electric compressor is mounted on a vehicle, generally, the motor shaft is directed in the front-rear direction of the vehicle, and one side of the inverter-integrated electric compressor is placed along a bracket fixed to the side of the prime mover or the like. The upper and lower three places of the lower part and the upper part are fastened and fixed with bolts. For this reason, when vertical vibration is propagated from the vehicle side, vibration around the motor axis is applied to the inverter-integrated electric compressor, and the inverter device may resonate via the metal base plate.
As countermeasures, it is conceivable to increase the rigidity by increasing the thickness of the metal base plate or increasing the number of fastening points on the housing side. This is not preferable because it deteriorates the cooling performance, weight reduction, and assembling performance of the heating element, and the vibration resistance of the inverter device is still a problem.

  This invention is made in view of such a situation, Comprising: The vibration resistance of the inverter apparatus integrated in the housing of an electric compressor is improved, without impairing cooling performance, weight reduction, and assembly property. An object of the present invention is to provide an inverter-integrated electric compressor.

In order to solve the above problems, the inverter-integrated electric compressor of the present invention employs the following means.
That is, the inverter-integrated electric compressor according to the present invention is provided with an inverter accommodating portion on the outer periphery of the housing in which the electric compressor is accommodated, and the inverter accommodating portion converts the DC power into three-phase AC power to be electrically In an inverter-integrated electric compressor in which an inverter device for supplying power to a motor is incorporated, the inverter device includes a metal plate fixedly installed in the inverter accommodating portion, and a plurality of power semiconductor switching elements installed on the metal plate And a power board mounted on the metal plate and mounted with a power system control circuit for operating the power semiconductor switching element, and a plurality of bus bars forming wiring of the inverter device, each bus bar being an insulating material An integrated bus bar assembly, and the metal plate has the electric mode. Characterized in that it comprises a projecting portion extending in the width direction in a direction orthogonal to the motor axis direction.

  According to the present invention, a plurality of power semiconductor switching elements, a power board, a bus bar assembly, and the like constituting the inverter device are installed on the metal plate, and the metal plate is fixedly installed in the inverter accommodating portion of the housing. In addition, the metal plate has a protruding portion extending in the width direction perpendicular to the motor axis direction of the electric motor, so that the metal plate has increased rigidity against vibration around the motor axis line and improved vibration resistance. Can be made. Accordingly, the vibration resistance of the metal plate, and hence the inverter device, can be easily improved without increasing the plate thickness and the fastening location of the metal plate, and the cooling performance, weight reduction, and assemblability of the inverter device can be ensured. .

  Furthermore, the inverter-integrated electric compressor according to the present invention is characterized in that, in the inverter-integrated electric compressor, a plurality of the projecting portions are provided on the metal plate at predetermined intervals along the motor axial direction. To do.

  According to the present invention, since a plurality of protrusions are provided at predetermined intervals along the motor axis direction, the rigidity of the metal plate against vibration around the motor axis can be significantly increased. Therefore, the vibration resistance of the metal plate and the inverter device can be further improved.

  Furthermore, in the inverter-integrated electric compressor according to the present invention, in any one of the inverter-integrated electric compressors, the protruding portion is formed by bending both end portions of the metal plate in a direction orthogonal to the motor axial direction. It is characterized by being configured.

  According to the present invention, since the projecting portion is formed by bending both end portions of the metal plate in the direction orthogonal to the motor axial direction, the number of bent portions in the metal plate is increased by two places, particularly the processing man-hour and the plate. Protrusions can be provided without increasing the amount of material. Therefore, the rigidity can be significantly increased while suppressing the manufacturing cost, and the vibration resistance of the inverter device can be improved.

  Furthermore, in the inverter-integrated electric compressor according to the present invention, in any one of the inverter-integrated electric compressors described above, the power board is screwed to a boss portion provided on the metal plate at at least three locations. It is characterized by that.

  According to the present invention, the power substrate is screwed to the boss portion of the metal plate at at least three locations, so that the power substrate is not loosened by vibration and is integrated with the metal plate to be firmly attached to the boss portion. Fixed installation. Accordingly, the rigidity of the inverter device can be increased and the vibration resistance can be improved.

  Furthermore, in the inverter-integrated electric compressor according to the present invention, in the inverter-integrated electric compressor, the boss portion is provided in at least three or more locations by bending a part of the metal plate upward, and at least One bent portion is bent in a direction parallel to the protruding portion.

  According to the present invention, the boss part is provided in at least three or more places, and the at least one bent part is bent in a direction parallel to the projecting part. A bending part can be contributed to the rigidity improvement with respect to the vibration around the motor axis line of a metal plate with a protruding part. Therefore, this also increases the rigidity of the metal plate against vibration around the motor axis, and improves the vibration resistance of the metal plate and the inverter device.

  Furthermore, the inverter-integrated electric compressor according to the present invention is any one of the above-described inverter-integrated electric compressors, wherein the bus bar assembly is fixed to the power board, and is screwed to fix the power board to the metal plate. It is arranged between the positions.

  According to the present invention, since the bus bar assembly is disposed between the screwing positions where the power board is fixed to the metal plate, the bus bar assembly serves as a beam and increases the rigidity of the power board in the assembled state. Can do. Thereby, the rigidity of an inverter apparatus can be improved and the vibration resistance can be improved more.

  Furthermore, the inverter-integrated electric compressor of the present invention is the above-described inverter-integrated electric compressor, wherein the bus bar assembly is configured in an L shape and is fixed along two adjacent sides of the power board. It is characterized by.

  According to the present invention, since the L-shaped bus bar assembly is fixed along two adjacent sides of the power board, not only can a plurality of bus bars be assembled as one component, but also the power board can be twisted. The strength against can be increased. For this reason, the assembly property and vibration resistance of the inverter device can be improved.

  Furthermore, the inverter-integrated electric compressor according to the present invention is any one of the above-described inverter-integrated electric compressors, wherein the plurality of power semiconductor switching elements are bent upward in an L shape from the side surface of each element. The plurality of extended terminals are arranged in a straight line.

  According to the present invention, since the plurality of terminals bent and extended upward from the side surface of the power semiconductor switching element are arranged in a straight line, the bending vibrations applied to each terminal are arranged. The stress due to can be equalized. Accordingly, it is possible to further improve the vibration resistance of the power semiconductor switching element, and hence the inverter device.

  Furthermore, the inverter-integrated electric compressor according to the present invention is the above-described inverter-integrated electric compressor, wherein the plurality of terminals extending from the respective elements are arranged in a straight line in a direction parallel to the protruding portion. It is installed.

  According to the present invention, since a plurality of terminals extending from each element are arranged in a straight line in a direction parallel to the projecting portion, each terminal that easily breaks when subjected to vibration in the bending direction is projected. It can be installed in the direction where the rigidity is increased by the part. Therefore, the vibration resistance of the power semiconductor switching element, and hence the inverter device, can be further improved.

  Furthermore, in the inverter-integrated electric compressor according to the present invention, in any one of the inverter-integrated electric compressors described above, the metal plate is screwed and fixed to the installation surface of the inverter accommodating portion at least at four corners. It is characterized by.

  According to the present invention, the metal plate is fixed to the installation surface of the inverter accommodating portion with screws at least at four corners, so that the rigidity with respect to vibration around the motor axis is enhanced by the protruding portion, The inverter device can be firmly fixed to the installation surface of the housing on the inverter accommodating portion side with screws at the four corners. Therefore, it is possible to ensure the cooling performance, weight reduction, and assembly of the inverter device while improving the vibration resistance of the inverter device.

  Furthermore, the inverter-integrated electric compressor according to the present invention is the above-described inverter-integrated electric compressor, wherein the metal plate is screwed to the installation surface of the inverter accommodating portion at least at substantially the center other than the four corners. It is fixed.

  According to the present invention, since the metal plate is screwed and fixed to the installation surface of the inverter accommodating portion at least at substantially the center other than the four corners, the rigidity of the metal plate can be improved at a high rate. Thereby, the stress applied to the terminal of the power semiconductor switching element installed on the metal plate can be reduced, and the vibration resistance of the inverter device can be further improved.

  Furthermore, the inverter-integrated electric compressor according to the present invention is characterized in that in any of the above-described inverter-integrated electric compressors, the metal plate is made of an aluminum alloy.

  According to the present invention, since the metal plate is made of an aluminum alloy, the cooling performance of the inverter device can be improved and the weight can be reduced by the good heat transfer characteristics and light weight of the aluminum alloy.

  According to the present invention, the metal plate is provided with a protruding portion extending in the width direction perpendicular to the motor axis direction of the electric motor, thereby increasing the rigidity of the metal plate against vibration around the motor axis. Can be improved. For this reason, it is possible to easily improve the vibration resistance of the metal plate, and thus the inverter device, without increasing the plate thickness and the fastening location of the metal plate, and to ensure the cooling performance, weight reduction and assembly property of the inverter device. it can.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is an external side view of an inverter-integrated electric compressor 1 according to an embodiment of the present invention. The inverter-integrated electric compressor 1 has a housing 2 that constitutes an outer shell thereof. The housing 2 is configured by integrally fastening and fixing a motor housing 3 in which an electric motor (not shown) is accommodated and a compressor housing 4 in which a compressor (not shown) is accommodated via a bolt 5. The motor housing 3 and the compressor housing 4 are made of aluminum die casting.

  An electric motor and a compressor (not shown) accommodated and installed in the motor housing 3 and the compressor housing 4 are connected via a motor shaft, and the compressor is driven by the rotation of the electric motor. A suction port 6 is provided on the rear end side (right side in FIG. 1) of the motor housing 3, and the low-pressure refrigerant gas sucked into the motor housing 3 from the suction port 6 flows around the electric motor. It is sucked into the compressor and compressed. The high-temperature and high-pressure refrigerant gas compressed by the compressor is discharged into the compressor housing 4 and then discharged from the discharge port 7 provided on the front end side (left side in FIG. 1) of the compressor housing 4 to the outside. It is supposed to be configured.

  The housing 2 includes two parts, a lower part on the rear end side (right side in FIG. 1) of the motor housing 3 and a lower part on the front end side (left side in FIG. 1) of the compressor housing 4, and one place on the upper side of the compressor housing 4. Mounting legs 8A, 8B, 8C are provided at a total of three locations. As shown in FIG. 2, the inverter-integrated electric compressor 1 is attached to a cantilever bracket 10 installed on the side wall or the like of the vehicle driving motor 9 via the mounting legs 8A, 8B, and 8C. It is fixedly installed with bolts and mounted on the vehicle. As described above, the inverter-integrated electric compressor 1 is generally cantilevered at three points in the vertical direction with one side faced along the cantilevered bracket 10 and the motor axial direction L directed in the longitudinal direction of the vehicle. Is normal.

  Further, a box-shaped inverter accommodating portion 11 is integrally formed on the outer peripheral surface of the motor housing 3 at the upper portion thereof. As shown in FIGS. 3 and 4, the inverter accommodating portion 11 has a box structure surrounded by a peripheral wall having a predetermined height and having an open upper surface. Two power cable outlets 12 are provided on the side surface of the inverter housing 11, and the DC power PN terminal 13 and the motor terminal mounting hole 14 to which the power cable is connected are provided inside the inverter housing 11. A metal plate installation surface 15, a metal plate installation boss 16 and a CPU board installation boss 17 are provided. The inverter accommodating portion 11 accommodates and installs a motor terminal 19, a head capacitor 20, an inductor 21, an inverter device 22 and the like attached to the motor terminal attachment hole 14, and a lid member 18 is fixed to the upper surface of the inverter accommodating portion 11 with screws. It is set as the structure covered by this.

  As shown in FIGS. 3 and 5, the inverter device 22 is in contact with the installation surface 15 of the inverter accommodating portion 11, the four corners are fixedly installed on the boss portion 16, and an aluminum alloy metal plate 23 that functions as a heat sink. And six power semiconductor switching elements (hereinafter referred to as “IGBT”; “Insulated Gate”) constituting the upper arm side switching element and the lower arm side switching element of each phase of the three-phase inverter installed on the metal plate 23. (Referred to as Bipolar Transistor) 24) (see FIGS. 5 and 8), a power system control circuit for operating the IGBT 24 is mounted, and the power board 25 installed on the boss portion on the metal plate 23 and the wiring of the inverter device 20 A plurality of bus bars, and each bus bar is inserted with an insulating resin. A bus bar assembly 26 which is integrated by molding, are circuit implemented with a device operating at low voltage, such as a CPU, four corners is provided with a CPU board 27 fixedly installed to the boss portion 17, a.

As shown in FIGS. 5 and 6, the aluminum alloy-made metal plate 23 is a rectangular press-made plate, and the four corners thereof are screwed to the boss portion 16 of the inverter accommodating portion 9 with screws 34. The screwing hole 30 is drilled. The metal plate 23 is provided with a plurality of holes 31 for installing six IGPTs 24 and a plurality of boss portions 32A to 32D for installing the power board 25. Further, the metal plate 23 has ribs (protruding portions) 33 formed by bending both ends of the motor axial direction L upward in order to increase the rigidity in the direction orthogonal to the motor axial direction L in the width direction. It is extended and provided.
In addition to the screw holes 30 at the four corners, the metal plate 23 may be provided with screw holes 30A at substantially the center thereof.

The boss portions 32A to 32D are provided by bending a part of the metal plate 23 upward at least at three or more (four in this embodiment) in order to firmly fix the power substrate 25. The bent portion of the boss portion 32A at least one of the boss portions 32A to 32D is provided by being bent in a direction orthogonal to the motor axial direction L, that is, in a direction parallel to the rib (projecting portion) 33.
The ribs (protrusions) 33 are not limited to those provided by bending both ends of the metal plate 23. The ribs (protrusions) are formed at a plurality of locations (two locations) in parallel with a predetermined interval in the middle of the plate. And so on).

  As shown in FIG. 5 and FIG. 8, each of the six IGPTs 24 is formed in a rectangular shape by a resin mold, extends from one side to the side, and is bent upward. There are a total of three terminals 40, two main electrode terminals and one control electrode terminal. The six IGBTs 24 are arranged in two rows of three in the direction orthogonal to the motor axial direction L, with the three IGBTs 24A on the upper arm side and the three IGBTs 24B on the lower arm side facing each other. Then, it is fixedly installed on the metal plate 23 with screws or the like through an insulating sheet (not shown). In addition, each of the three IGBTs 24 </ b> A and IGBTs 24 </ b> B has terminals 40 arranged in a straight line in a direction orthogonal to the motor axial direction L.

  The power board 25 on which the power system control circuit is mounted has connection holes into which 18 terminals 40 of 6 IGBTs 24 are fitted, as shown in FIG. 3, FIG. 7, and FIG. The terminal 40 is fitted into the hole and soldered to the surrounding conductive pattern. The circuit of the power board 25 has a function of intermittently controlling the IGBT 24 based on a command from the outside to supply power to the electric motor, a function of communicating the driving state of the electric motor to the outside, and the like. The power board 25 is fixedly installed on the four boss portions 32 </ b> A to 32 </ b> D of the metal plate 23 via screws 45 and integrated with the metal plate 23.

  As shown in FIGS. 5 and 7, the bus bar assembly 26 includes a PN bus bar 50 that connects the IGBT 24 and the PN terminal 13 of DC power, and a U-VW that connects the IGBT 24 and the motor terminal 19. A plurality of bus bars such as the bus bar 51 are integrated by insert resin molding to form a single part. The insert resin 52 of the bus bar assembly 26 maintains good electrical insulation between the bus bars even if the gaps between the bus bars are small. The bus bar assembly 26 is formed in an L shape so as to face the PN terminal 13 and the motor terminal 19 of DC power, and is integrated with the power board 25 by screws 53 along two adjacent sides of the power board 25. Fixed to. Further, the bus bar assembly 26 is arranged between the screwing positions when the power board 25 is fixed to the metal plate 23 with screws.

  As described above, the inverter device 22 is configured by installing the six IGBTs 24, the power board 25, and the bus bar assembly 26 on the metal plate 23, and the inverter device 22 is placed in the inverter accommodating portion 11 of the motor housing 3. The metal plate 23 is accommodated and installed with the bottom surface of the metal plate 23 in contact with the installation surface 15. Further, a CPU board 27 constituting the inverter device 22 is installed on the upper part of the CPU board 27 by being screwed to the CPU board installation boss part 17, and the upper part is covered with the lid member 18.

According to this embodiment described above, the following operational effects are obtained.
The inverter device 22 is housed and installed in the inverter housing portion 11 of the motor housing 3 and integrated with the electric compressor 1. This inverter device 22 is provided with a metal plate 23 made of aluminum alloy, and the bottom surface of the metal plate 23 is installed in contact with the installation surface 15 of the inverter housing portion 11, and a power heating element such as an IGBT 24 is provided thereon. Is installed. For this reason, the metal plate 23 made of aluminum alloy is cooled through the motor housing 3 by the low-temperature and low-pressure refrigerant gas sucked into the motor housing 3 from the suction port 6 and circulated around the electric motor. As a result, the metal plate 23 becomes a heat sink, and the heat generated by the IGBT 24 or the like is dissipated, so that the heating element such as the IGBT 24 can be cooled.
Therefore, the heat generating system components (elements) that require cooling that constitute the inverter device 22 can be surely forcibly cooled by the low-temperature refrigerant gas, and the cooling function of the inverter device 22 can be ensured.

Further, vibration on the vehicle side is directly transmitted to the inverter-integrated electric compressor 1 via the bracket 10. This vibration is propagated as it is to the inverter device 22 housed and installed in the inverter housing portion 11 of the motor housing 3 and acts as an excitation force on the inverter device 22. In particular, the vertical vibration of the vehicle originates from the mounting structure of the inverter-integrated electric compressor 1 with respect to the vehicle, and becomes a vibration around the motor axis of the electric compressor 1, and thus the inverter-integrated electric compressor 1, that is, the inverter device. 22 and the inverter device 22 is likely to resonate.
However, the inverter device 22 is installed on the metal plate 23 made of an aluminum alloy as described above, and the metal plate 23 has both ends of the motor axial direction L upward in a direction orthogonal to the motor axial direction L. Ribs (protruding portions) 33 formed by being bent in a direction extending in the width direction are provided. Thereby, since the rigidity of the metal plate 23 is significantly increased with respect to vibration around the motor axis and the natural frequency is increased, the resonance of the inverter device 22 due to the above can be suppressed.

  Therefore, it is possible to easily improve the vibration resistance of the metal plate 23 and thus the inverter device 22 without increasing the thickness of the metal plate 23 or increasing the number of fastening points. Further, since the metal plate 23 is brought into contact with the installation surface 15 of the inverter accommodating portion 11 and is fixed with screws at at least four corners, the rib (protruding portion) 33 increases the rigidity against vibration around the motor axis. The inverter device 22 can be firmly fixed to the inverter accommodating portion 11 of the motor housing 3 with screws at the four corners via the metal plate. Therefore, it is possible to secure the cooling performance, weight reduction, and assemblability of the inverter device 22 while improving the vibration resistance by increasing the rigidity of the entire inverter device 22.

Further, since the metal plate 23 is made of an aluminum alloy, the cooling performance of the inverter device 22 can be improved and the weight thereof can be reduced by the good heat transfer characteristics and light weight of the aluminum alloy.
Further, since the ribs (protruding portions) 33 are formed at both ends of the metal plate 23 by bending the end portions upward, the ribs (protruding portions) are for improving rigidity without increasing the number of processing steps and the amount of plate material. Ribs (projections) 33 can be provided. Therefore, the rigidity of the whole width direction orthogonal to the motor axial direction L of the metal plate 23 can be increased while suppressing the manufacturing cost.

  In addition, the power board 25 installed on the metal plate 23 is also firmly screwed and fixed to the boss portions 32A to 32D of the metal plate 23 at at least three locations (four locations in the present embodiment) and integrated with the metal plate 23. It becomes. Thereby, the rigidity with respect to the vibration of the whole inverter apparatus 22 can be improved, and vibration resistance can be improved. In particular, a bent portion of at least one boss portion 32A of the boss portions 32A to 32D for fixing the power board 25 is bent in a direction orthogonal to the motor axial direction L, that is, in a direction parallel to the rib (projecting portion) 33. Therefore, the bent portion can contribute to the increase in rigidity against vibration around the motor axis, and the vibration resistance of the inverter device 22 can be further improved.

  In addition, an L-shaped bus bar assembly 26 that is integrally insert-molded with an insulating material (resin material) is integrally fixed to the power board 25 between two adjacent sides. Since the bus bar assembly 26 is disposed between the plurality of screws 45 that screw the power board 25 onto the metal plate 23, the bus bar assembly 26 acts as a beam. This also increases the assembly strength and torsional strength of the power board 25, and improves the vibration resistance of the inverter device 22. In addition, since the bus bar assembly 26 integrates a plurality of bus bars and is integrated to form the wiring of the inverter device 22 as one component, it is a matter of course that the assemblability of the inverter device 22 can be improved.

  Further, the IGBT 24 is orthogonal to the motor axial direction L with three terminals 24A extending from the side surfaces of the three IGBTs 24A on the upper arm side and the three IGBTs 24B on the lower arm side facing each other. Three terminals are arranged in two rows in the direction, and each terminal 40 is arranged in a straight line in a direction orthogonal to the motor axial direction L. Therefore, the stress applied to each terminal 40 due to the vibration in the bending direction can be made uniform, and the vibration resistance strength of each terminal 40 can be increased by utilizing the rigidity of the rib (protruding portion) 33. Therefore, the vibration resistance of the IGBT 24, and hence the inverter device 22, can be improved.

  In addition to the above four corners, the metal plate 23 is provided with a screw hole 30A in the substantially central portion thereof and fixed to the inverter accommodating portion 11 with screws, thereby improving the rigidity of the metal plate 23 at a high rate. Can be made. For this reason, the stress concerning the terminal 40 of IGBT24 installed in the metal plate 23 can be reduced, and the vibration resistance of the inverter apparatus 22 can be improved further.

In the above embodiment, the metal plate 23 is made of press, but it can also be made of die casting.
Further, the suction port 6 provided on the side surface of the motor housing 3 may be provided on the rear end surface.
The power semiconductor switching element 24 is not limited to a resin-molded discrete product, but may be a bare chip product or a MOS (Metal Oxide Semiconductor).
Further, the description of the configuration of the compressor is omitted, but any type of compressor may be used.

1 is an external side view of an inverter-integrated electric compressor according to an embodiment of the present invention. It is a front view of the attachment state with respect to the vehicle of the inverter integrated electric compressor shown in FIG. It is the disassembled perspective view seen from the motor housing side of the inverter integrated electric compressor shown in FIG. FIG. 2 is a top perspective view of a motor housing of the inverter-integrated electric compressor shown in FIG. 1. FIG. 2 is a top perspective view of a motor housing in a state where an inverter device of the inverter-integrated electric compressor shown in FIG. 1 is incorporated. It is a perspective view of the metal plate which comprises the inverter apparatus of the inverter integrated electric compressor shown in FIG. It is a perspective view of the state which isolate | separated the power board part of the inverter apparatus of the inverter integrated electric compressor shown in FIG. It is a side view of the direction orthogonal to the motor shaft direction of the inverter apparatus of the inverter integrated electric compressor shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inverter integrated electric compressor 2 Housing 3 Motor housing 4 Compressor housing 11 Inverter accommodating part 22 Inverter apparatus 23 Metal plate 24 IGBT (Power semiconductor switching element)
25 Power board 26 Bus bar assembly 32A, 32B, 32C, 32D Boss part 33 Rib (protruding part)
40 IGBT terminal 45 Screw 50, 51 Bus bar 52 Insert resin L Motor axial direction

Claims (12)

Inverter-integrated electric compression in which an inverter accommodating portion is provided on the outer periphery of a housing in which the electric compressor is accommodated, and an inverter device that converts DC power into three-phase AC power and supplies the electric motor is incorporated in the inverter accommodating portion. In the machine
The inverter device includes a metal plate fixedly installed in the inverter accommodating portion, a plurality of power semiconductor switching elements installed on the metal plate, and the power semiconductor switching element installed on the metal plate. A power board on which a power system control circuit to be operated is mounted, and a bus bar assembly including a plurality of bus bars forming wiring of the inverter device, and each bus bar integrated with an insulating material,
The inverter-integrated electric compressor according to claim 1, wherein the metal plate includes a protruding portion extending in a width direction perpendicular to a motor axial direction of the electric motor.   2. The inverter-integrated electric compressor according to claim 1, wherein a plurality of the protruding portions are provided on the metal plate at a predetermined interval along the motor axis direction.   3. The inverter-integrated electric compressor according to claim 1, wherein the projecting portion is configured by bending both end portions of the metal plate in a direction orthogonal to the motor axial direction.   The inverter-integrated electric compressor according to any one of claims 1 to 3, wherein the power board is screwed to a boss portion provided on the metal plate at at least three locations.   The boss portion is provided in at least three or more places by bending a part of the metal plate upward, and at least one of the bent portions is bent in a direction parallel to the projecting portion. The inverter-integrated electric compressor according to claim 4.   6. The inverter-integrated electric compression according to claim 4, wherein the bus bar assembly is fixed to the power board and disposed between screwing positions for fixing the power board to the metal plate. Machine.   The inverter-integrated electric compressor according to claim 6, wherein the bus bar assembly is configured in an L shape and is fixed along two adjacent sides of the power board.   2. The plurality of power semiconductor switching elements, wherein a plurality of terminals that are bent and extended upward from a side surface of each element are arranged in a straight line. The inverter-integrated electric compressor according to claim 7.   9. The inverter-integrated electric compressor according to claim 8, wherein the plurality of terminals extending from each of the elements are arranged in a straight line in a direction parallel to the projecting portion.   The inverter-integrated electric compressor according to any one of claims 1 to 9, wherein the metal plate is screwed and fixed to at least four corners on the installation surface of the inverter accommodating portion.   11. The inverter-integrated electric compressor according to claim 10, wherein the metal plate is screwed and fixed to the installation surface of the inverter accommodating portion at least at substantially the center other than the four corners. The inverter-integrated electric compressor according to any one of claims 1 to 11, wherein the metal plate is made of an aluminum alloy.

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