JP2011067064A - Inverter integrated electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inverter integrated electric compressor that increases a tightening force for a switching element, allows for easy removal of the switching element even after components up to a control board are assembled into a housing, and has high cooling performance for the switching element. <P>SOLUTION: The inverter integrated electric compressor is equipped with: a semiconductor switching element module 21 for power application from which a plurality of terminals 22 are extracted; and a power board 23 that has a plurality of connection holes to insert the terminals 22 and is mounted with a circuit for operating the module 21. The module 21 is held in an inverter storing section 10 while being in contact with a holding surface 14 by means of a metal- or resin-made presser piece 25 that is provided across the holding surface 14 and the module 21 and is fastened to the holding surface 14. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

Recently, in response to the energy environment, development of vehicles that use electric power, such as hybrid vehicles, electric vehicles, and fuel cell vehicles, and their introduction into the market are proceeding at a rapid pace.
Unlike conventional air conditioners, these vehicles are equipped with air conditioners that include an electric compressor driven by an electric motor powered by electricity. This electric compressor with built-in compressor and electric motor in a hermetically sealed housing supplies the electric motor with electric power converted into three-phase alternating current via an inverter device, and the rotation speed of the compressor can be changed according to the air conditioning load. Control.
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 so far. This inverter-integrated electric compressor has a power semiconductor switching element (hereinafter simply referred to as a switching element) such as an IGBT (Insulated Gate Bipolar Transistor) or a power MOS transistor on the outer peripheral surface of the housing. Install. Further, a control board on which a circuit for operating the switching element is mounted is disposed above the switching element.

  The switching element is fixed to the outer peripheral surface of the housing by a screw as a single unit or a module. However, the screw fixing holes that are typically formed in the small switching elements accompanying the miniaturization of the electric compressor are small and a large screw cannot be used, so that the force for fastening the switching elements is weak. In a high vibration environment such as an automobile, if the fastening force is weak, the screw may be loosened, and there is a concern that the reliability of the inverter device may be reduced. In the case of a module type switching element, since the element weight is large, there is a particular concern about loosening of screws.

Moreover, since it is necessary to rotate the screw which fixes a switching element after installation of a control board, the control board arrange | positioned above a switching element is provided with the insertion hole which lets a tool pass. For example, in Patent Document 1, as shown in FIG. 17, a switching element module 102 for a main circuit attached to the surface of a heat sink 100 with screws 101, a drive circuit for the module 102, and a control circuit for controlling the circuit A switching element mounting structure is disclosed that includes a control board 103 on which is mounted, and an insertion hole 104 through which a tool that turns the screw 101 passes above the screw 101 in the control board 103. The module 102 and the control board 103 are pin-connector joined, and the control board 103 is provided so as to cover the module 102.
However, if the insertion hole 104 is formed in the control board 103, an area where components can be mounted (hereinafter referred to as an effective area) decreases. In particular, when a hole is formed in the center of the substrate, the effective area may be lost around the hole in order to prevent the circuit wiring from being cut off.

As a measure for avoiding the insertion hole, in Patent Document 2 and Patent Document 3, as shown in FIGS. 18 and 19, after the switching element 201 is screwed to the metal plate 200, the control board 203 and the terminal 202 of the switching element 201 are used. An inverter device for soldering is disclosed. In this inverter device, the metal plate 200 on which the switching element 201 and the control board 203 are placed is fixed to the outer peripheral surface of the housing by screws. The metal plate 200 has a surface area equivalent to that of the control board 203.
However, the mounting structure of the switching element 201 using the metal plate 200 increases the distance from the lower surface of the switching element 201 to the outer peripheral surface of the housing, which is the cooling surface, by the thickness of the metal plate. As a result, the cooling performance of the switching element is insufficient. Further, the cost increases by the amount of the metal plate.
In this mounting structure, the metal plate may be omitted and the switching element may be directly fixed to the housing with a screw. However, if the soldering between the control board 203 and the terminal 202 of the switching element 201 is not removed, the control element can be controlled. Since the switching element 201 cannot be removed from the housing as well as the substrate 203, the maintainability is low.

JP 2000-245171 A JP 2008-128142 A JP 2008-215089 A

  The present invention has been made on the basis of the technical problems described above. The fastening force of the switching element can be increased, and the switching element can be easily removed even after the control board is assembled on the switching element. It is an object of the present invention to provide an electric compressor integrally provided with an inverter device having a high element cooling performance.

  If the switching element is fixed to the housing with the presser piece, the size of the screw to be used can be set arbitrarily, so that the fastening force of the switching element can be increased. In addition, when the presser piece is fixed to the housing using a screw, a portion to be screwed can be provided outside the area of the projection surface of the control board. If it does so, an effective area will not be reduced by making the control board the hole which the tool which turns a screw to a control board passes. Furthermore, when the switching element is fixed to the housing with the holding piece, the cooling surface of the switching element can be in direct contact with the surface of the housing, which is the cooling surface, so the cooling performance of the switching element is higher than when a metal plate is interposed. .

  The present invention is based on such knowledge, and is provided with an inverter accommodating portion having a holding surface on the outer periphery of the housing in which the electric compressor is accommodated, and converts DC power into three-phase AC power in the inverter accommodating portion. In the inverter-integrated electric compressor in which the inverter device that supplies power to the electric motor is incorporated, the inverter device has a power semiconductor switching element from which a plurality of terminals are extended, and a plurality of connection holes into which the terminals are fitted, And a control board on which a circuit for operating the power semiconductor switching element is mounted. A feature of the present invention resides in that the switching element is held by a pressing piece that is provided across the holding surface and the switching element and is fixed to the holding surface. The switching element is held in the inverter housing portion while being in contact with the holding surface.

  The presser piece according to the present invention can be composed of a fixing part and a presser part. A pair of fixing portions are provided at both ends in the length direction, and are fixed to the holding surface by appropriate means. The presser part is connected to the fixed part and presses the switching element toward the holding surface.

  As for the above-mentioned presser piece, it is preferred that the fixed part is formed wider than the presser part. As will be described later, the presser piece has a function of assisting heat dissipation from the switching element, and the heat dissipation function is improved as the area of the fixing portion in contact with the holding surface of the housing increases.

The fixing part according to the present invention is preferably fixed to the holding surface outside the area of the projection surface of the control board. Even after the control board is assembled, the presser piece that has been screwed can be removed, so that the maintenance is excellent.
In the present invention, by providing a cutout in the control board, the fixing portion can be fixed to the holding surface outside the area of the projection surface of the control board. Since the cutout is formed at the periphery of the control board, it has little effect on the effective area.

  In the present invention, the presser piece is preferably fixed to the holding surface by screwing together with the control board. Compared to screwing the holding piece and the control board with individual screws, the number of screwing work steps and the number of screws to be used can be reduced.

  The switching element in the present invention is preferably a switching element module that includes a plurality of switching elements and is structurally integrated. In the present invention, a discrete type IGBT or the like can also be used as a switching element. However, a modularized switching element is advantageous because a module including a large number of switching elements can be fixed by a single pressing piece.

  According to the present invention, the switching element is held by the pressing piece, but since the screw hole that is vacated in the pressing piece, that is, the size of the screw to be used can be arbitrarily set, the fastening force of the switching element can be improved.

It is a perspective view which shows the inverter integrated electric compressor by this embodiment. It is sectional drawing which shows the attachment structure of the switching element module by 1-1st embodiment. It is a top view which shows the attachment structure of the switching element module by 1-1st embodiment. It is a top view which shows the attachment structure of the switching element module by 1st-2 embodiment. It is a top view which shows the attachment structure of the switching element module by 1-3 embodiment. It is a top view which shows the attachment structure of the switching element module by 1-4th embodiment. It is sectional drawing which shows the attachment structure of the switching element module by 1-5th embodiment. It is sectional drawing which shows the attachment structure of the switching element module by 2nd-1 embodiment. It is a top view which shows the attachment structure of the switching element module by 2nd-1 embodiment. It is a top view which shows the attachment structure of the switching element module by 2nd-2 embodiment. It is sectional drawing which shows the attachment structure of the switching element module by 3rd Embodiment. It is a top view which shows the attachment structure of the switching element module by 3rd Embodiment. It is a top view which shows the attachment structure of the switching element module by 4th-1 embodiment. It is a top view which shows the attachment structure of the switching element module by 4th-2 embodiment. It is a top view which shows the attachment structure of the switching element module by 4-3 embodiment. It is a top view which shows the attachment structure of the switching element module by 4th-4 embodiment. It is a perspective view which shows the attachment structure of the switching element disclosed by patent document 1. FIG. It is the perspective view which looked at the inverter apparatus disclosed by patent document 2 from the power board side. It is a perspective view of the state which mounted IGBT and the guide member on the metal plate which comprises the inverter apparatus disclosed by patent document 2. FIG.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
<First Embodiment>
An inverter-integrated electric compressor (hereinafter simply referred to as a compressor) 1 according to this embodiment includes 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 (not shown). The 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 5 is provided at the rear end side of the motor housing 3, and the low-pressure refrigerant gas sucked into the motor housing 3 from the suction port 5 flows around the electric motor and is then sucked into the compressor. 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 6 provided on the front end side of the compressor housing 4 to the external refrigeration cycle. .

  An inverter housing portion 10 is integrally formed on the upper outer peripheral surface of the motor housing 3 at the upper portion thereof. The inverter accommodating portion 10 has a box structure surrounded by a peripheral wall 11 having a predetermined height with an upper surface opened. A power cable outlet 12 is provided in a part of the peripheral wall 11, and a motor terminal mounting hole 13 and a power semiconductor switching element holding surface (hereinafter simply referred to as a holding surface) 14 are provided in the inverter housing 10. Provided. In addition to the inverter device 20, the inverter accommodating portion 10 accommodates and installs a motor terminal, a head capacitor, an inductor, and the like (all not shown) that are attached to the motor terminal attaching hole 13, and the upper surface thereof is a lid that is not shown It is set as the structure covered by screwing and fixing a member.

  The holding surface 14 also functions as a heat radiating surface that radiates heat from a power semiconductor switching element module (hereinafter simply referred to as module) 21, which will be described later, to a low-temperature refrigerant gas flowing in the motor housing 3. Most of the other inner surface of the inverter accommodating portion 10 is left as the casting surface of die casting, whereas the holding surface 14 is a machined surface that has been machined. This is because the contact area between the module 21 and the presser piece 25 is increased to increase the heat dissipation efficiency from the holding surface 14.

The inverter device 20 includes a module 21 including a power semiconductor switching element, and a power board (control board) 23 on which a power system control circuit for operating the module 21 is mounted and installed above the module 21.
The module 21 includes, for example, six IGBTs constituting the upper arm side switching element and the lower arm side switching element of each phase of the three-phase inverter. In addition to these switching elements, the module 21 is a metal heat radiating plate (not shown) that radiates heat generated by operation of the power semiconductor switching element, wiring for signal transmission / reception with the outside and internal signal transmission / reception. A plurality of terminals 22 for transmitting and receiving signals to and from the power board 23. The module 21 is configured by resin molding these elements. The heat radiating plate is provided exposed on the lower surface side of the module 21, and the surface of the heat radiating plate is processed to be flat and in close contact with the holding surface 14.
The inverter device 20 includes a bus bar assembly in which a plurality of bus bars forming wiring are integrated by insert molding with a resin as an insulating material, a CPU board on which a circuit having elements operating at a low voltage such as a CPU is mounted, and the like These are not shown in the figure.

In the inverter device 20, the module 21 is fixed to the holding surface 14 by the pressing piece 25, and the power board 23 is disposed above the module 21. The terminal 22 of the module 21 is inserted into the connection hole 24 of the power board 23 and soldered to the surrounding conductive pattern, whereby the power board 23 is electrically connected to the module 21. In place of or in addition to fixing the power board 23 to the module 21 by soldering, a boss for fixing the power board 23 may be provided in the inverter accommodating portion 10 and screwed to the boss.
Hereinafter, the mounting structure of the module 21 by the presser piece 25 will be described with reference to FIGS.

First, the module 21 is installed on the holding surface 14 of the inverter accommodating portion 10 provided on the upper outer peripheral surface of the motor housing 3.
The presser piece 25 that is provided across the holding surface 14 and the module 21 and fixes the module 21 to the holding surface 14 is formed of a band-shaped metal plate. The presser piece 25 has a total length longer than the length of the power board 23 (horizontal direction in FIG. 3), a pair of fixing portions 26 fixed to the holding surface 14 at both ends in the length direction, and a module 21 and a presser portion 27 that presses 21. Further, the presser piece 25 is set to be sufficiently narrower than the width of the module 21 (the vertical direction in FIG. 3), and the presser part 27 presses the center part in the width direction of the power board 23. The material of the metal constituting the presser piece 25 is not limited, but copper, aluminum, or an alloy thereof may be used from the viewpoint of thermal conductivity, elasticity required for the presser piece 25, corrosion resistance, cost, and the like. preferable. However, the present invention allows the presser piece 25 to be made of, for example, resin other than metal.
The fixing part 26 has a screw hole SH through which the screw S passes. The screw hole SH is located outside the region of the projection surface of the power substrate 23 (the region indicated by the dotted line in FIG. 3) in a state where the module 21 and the power substrate 23 are disposed at predetermined positions.

  The presser 27 is connected to the pair of fixed portions 26 and is arranged at the center in the length direction. The presser part 27 is formed so as to protrude above the fixed part 26 in order to secure a space in which the module 21 is disposed. The holding part 27 connected to the fixing part 26 presses the module 21 toward the holding surface 14 by fixing the fixing part 26 to the holding surface 14 with the screw S. Note that the presser portion 27 does not have to have a uniform width.

In the above configuration, since the screw hole SH is formed in the holding piece 25, there is no restriction on the diameter in a range less than the width of the holding piece 25. Therefore, according to this embodiment, since the screw S itself can be enlarged accordingly, the fastening force by the screw S can be improved and the loosening of the screw S can be suppressed.
Further, in this embodiment, the position where the screw S passes through the screw hole SH and fixes the fixing portion 26 to the holding surface 14 is outside the region of the projection surface of the power board 23, so that the inverter device 20 is assembled. In addition, the module 21 can be easily detached from the holding surface 14 together with the power board 23 by operating the screw S.
Further, in the present embodiment, since it is not necessary to make a hole for operating the screw S in the power board 23, the entire surface of the power board 23 can be used as an effective area where components can be mounted.
Furthermore, according to the present embodiment, the heat radiating surface of the module 21 can be brought into direct contact with the holding surface 14 that functions as the heat radiating surface, so that the cooling performance is improved as compared with the metal plate disclosed in Patent Documents 2 and 3. It can be improved. In particular, in the present embodiment, the pressing piece 25 is indicated by a white arrow in FIG. 2 because the pressing portion 27 is in contact with the upper surface of the module 21 and the fixing portion 26 connected to the pressing portion 27 is in contact with the holding surface 14. As described above, in addition to the lower surface of the module 21, a path for transferring heat from the upper surface of the module 21 to the holding surface 14 is newly formed, which contributes to improving the cooling performance of the module 21.
Furthermore, since the presser piece 25 is smaller than the metal plate used in Patent Documents 2 and 3 and has a simple shape, the cost of the inverter-integrated electric compressor is reduced compared to Patent Documents 2 and 3. Contribute.
The above effects also apply to the embodiments described later.

<First and Second Embodiments 1-3>
The presser piece 25 according to the first to first embodiments is formed of a metal plate having the same width over the entire length, but the presser piece according to the present invention is not limited to this form as shown below.
The holding piece 35 (see FIG. 4) according to the first to second embodiments is provided with fixing portions 36 extending in a flange shape at both ends of the holding portion 37, and has an H-shaped planar shape. Thus, the fixing portion 36 is formed wider than the pressing portion 37 and the fixing portion 36 can be fixed to the holding surface 14 with a plurality of screws S, so that the fastening force of the pressing piece 35 to the holding surface 14 can be increased. Further, since the contact area between the holding surface 14 and the fixing portion 36 is increased, the heat radiation efficiency to the holding surface 14 via the pressing piece 35 can be improved.
The presser piece 45 (see FIG. 5) according to the first to third embodiments is intended to maximize the fastening force to the holding surface 14 of the presser piece 45 and the heat radiation to the holding surface 14 via the presser piece 45. It is composed of a belt-like presser portion 47 and a rectangular ring-shaped fixing portion 46 surrounding it.

<First to Fourth Embodiment>
In the first to first to third embodiments, the holding portions 27, 37, and 47 press the module 21 through both edge portions opposed to the longitudinal direction of the module 21, but the holding piece 55 (see FIG. 6). ) Can be shortened, and the module 21 can be pressed toward the holding surface 14 by the pressing portion 57 from each edge of the opposing module 21 to a predetermined range. By fixing the fixing portion 56 connected to the presser portion 57 with the screw S, the presser piece 55 is fixed to the holding surface 14. The presser piece 55 is effective for further reducing the cost.

<1-5 embodiment>
In the above embodiment, the fixing portions 26, 36, 46, 56 are fixed on the same plane as the installation surface of the module 21, but are inclined with respect to the installation surface of the module 21 as shown in FIG. 7. The fixing portion 66 can be fixed on the surface. The pressing piece 65 is configured such that a fixing portion 66 is tapered with respect to the pressing portion 67.
By using such a pressing piece 66, the module 21 can be installed on the holding surface 14 in various forms as well as on a flat surface, so that the degree of freedom of the shape of the installation surface of the module 21 can be improved.

<Embodiments 2-1 and 2-2>
Next, a structure according to the 2-1 embodiment capable of accommodating the inverter accommodating portion 10 having a small size will be described with reference to FIGS. 8 and 9, the same components as those in the first to first embodiments are denoted by the same reference numerals as those in FIGS. 2 and 3, and description thereof may be omitted.

  The inverter-integrated electric compressor 1 is required to be reduced in size, and in this case, it is required to reduce the width of the inverter accommodating portion 10. On the other hand, since the power board 23 has a limited area reduction in order to exhibit its function, the power board 23 may occupy the full width of the inverter accommodating portion 10 defined by the inner wall surface of the peripheral wall 11. In this case, the structure in which the fixing portion 26 of the pressing piece 25 protrudes from the power board 23 as in the first to first embodiments cannot be employed. Therefore, the power board 23 according to the 2-1 embodiment is provided with a notch 23c. The notch 23 c is provided at a position corresponding to the screw S that fixes the presser piece 25. Further, the notch 23 c is provided on the periphery of the power board 23 corresponding to the screw S. When the notch 23c is provided in the power board 23, the surface area of the power board 23 is reduced. However, since the peripheral part is less used for component mounting than the central part of the board, the reduction of the effective area can be suppressed as much as possible. . Therefore, the effective area can be widened as compared with Patent Document 1 in which the screw hole is provided at the center of the substrate. This also means that the width of the inverter-integrated electric compressor 1 can be reduced.

  As shown in FIG. 10, the 2-2 embodiment in which the reduction of the effective area can be minimized while providing the notches 23 c is provided with the notches 23 c at the four corners of the power substrate 23. Since the four corners of the power board 23 are hardly used for component mounting, the effective area does not decrease or can be minimized even if it decreases. In the second to second embodiments, an H-type presser piece 35 is used as in the first to second embodiments, and a structure in which both ends of the fixing portion 36 are fixed with screws S is employed.

<Third Embodiment>
As described above, the power board 23 can be screwed to the inverter accommodating portion 10. However, in the third embodiment, as shown in FIG. 11 and FIG. Propose a fixed structure.

The inverter accommodating portion 10 according to the third embodiment includes the boss portion 14b protruding from the holding surface 14 at a position facing the peripheral wall 11, and the upper surface of the boss portion 14b also forms the holding surface 14.
The pressing piece 75 is disposed between a pair of fixing portions 76 fixed in contact with the upper surface (holding surface 14) of the boss portion 14 b and the fixing portion 76, and presses the module 21 toward the holding surface 14. Is provided. Since the fixing portion 76 is placed on the upper surface of the boss 14b, the fixing portion 76 is positioned above the presser portion 77 via the bent portion. The fixing portion 76 has a screw hole SH into which the screw S is inserted.
The power board 23 is placed on the fixing portion 76 of the pressing piece 75. The power board 23 has a screw hole SH at a position corresponding to the screw hole SH of the fixing portion 76.

  The presser piece 75 and the power board 23 are screwed to the boss portion 14b with the screw S in a state where the presser piece 75 and the power board 23 are laminated and the screw holes SH are aligned in the vertical direction. Then, the pressing part 77 presses the module 21 toward the holding surface 14, so that the module 21 is fixed to the inverter accommodating part 10.

In the third embodiment, since the power board 23 and the presser piece 75 are screwed with the same screw S, the man-hours for screwing or unscrewing can be reduced by half as compared with screwing each individually, and the screw S The number can be halved. In the third embodiment, since the presser piece 75 is screwed from above the power board 23 with a common screw S, the power board can be removed by removing the screw S even after the power board 23 is assembled. Of course, the module 21 can also be removed.
Furthermore, in the third embodiment, even if the power board 23 occupies the full width of the inverter accommodating portion 10, the screw board SH may be provided on the periphery of the power board 23, so that the effective area of the power board 23 is increased. Reduction can be suppressed as much as possible.

<4-1 to 4-4 Embodiments>
In the above embodiment, the module type IGBT is used as the switching element. However, the present invention can also use a discrete type IGBT.
For example, when six discrete-type IGBTs 30 are used as power semiconductor switching elements, a set of three IGBTs 30 arranged in one column is arranged in two columns as shown in FIG. 13 (fourth embodiment). . The IGBT 30 can be fixed to the holding surface 14 by the pressing pieces 25 one by one.

Further, as shown in FIG. 14 (fourth embodiment), even when a discrete IGBT 30 is used, even when the power board 23 occupies the full width of the inverter housing portion 10, the notch 23c is used. By providing at the periphery, the reduction of the effective area of the power substrate 23 can be suppressed as much as possible.
Similarly, as shown in FIG. 15 (fourth embodiment), even when a discrete type IGBT 30 is used, a boss portion 14b is provided and the power board 23 and the presser piece 25 are screwed with the same screw S. be able to. Therefore, the same effect as the third embodiment can be enjoyed.

  Further, as shown in FIG. 16, the positioning plate 28 having the terminal positioning holes 29 and the presser piece 25 are integrated. By inserting the terminal 31 of the IGBT 30 into the terminal positioning hole 29, the discrete type IGBT 30 can be accurately aligned.

Although the presser piece is screwed in the above embodiment, other fixing means such as an adhesive can be used in the present invention.
The presser piece can be manufactured by punching or pressing, but may be manufactured by welding or another joining method.
In addition to this, as long as it does not depart from the gist of the present invention, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Inverter integrated electric compressor 2 ... Housing, 3 ... Motor housing, 4 ... Compressor housing 10 ... Inverter accommodating part, 14 ... Holding surface, 14b ... Boss 20 ... Inverter device 21 ... Module, 22 ... Terminal, 23 ... Power board (control board) 24 ... Connection hole 25, 35, 45, 55, 65, 75 ... Presser piece 26, 36, 46, 56, 66, 76 ... Fixing part 27, 37, 47, 57, 67, 77 ... Presser part S ... Screw, SH ... Screw hole

Claims (7)

An inverter housing portion having a holding surface is provided on the outer periphery of the housing in which the electric compressor is housed, and an inverter device that incorporates an inverter device that converts DC power into three-phase AC power and supplies the electric motor to the inverter housing portion. In the body type electric compressor,
The inverter device is
A power semiconductor switching element from which the plurality of terminals extend;
A plurality of connection holes into which the terminals are fitted, and a control board on which a circuit for operating the switching element is mounted,
The switching element is
An inverter-integrated electric compressor, wherein the inverter-integrated electric compressor is held across the holding surface and in contact with the holding surface by a pressing piece that is provided across the holding surface and the switching element and is fixed to the holding surface. The presser piece is
A pair of fixing portions provided at both ends in the length direction and fixed to the holding surface;
A presser part that continues to the fixed part and presses the power semiconductor switching element toward the holding surface;
An inverter-integrated electric compressor according to claim 1. The presser piece is
The inverter-integrated electric compressor according to claim 2, wherein the fixing portion is formed wider than the pressing portion. The fixing part is
The inverter-integrated electric compressor according to claim 1, wherein the inverter-integrated electric compressor is fixed to the holding surface outside a region of a projection surface of the control board. The presser piece is
The inverter-integrated electric compressor according to claim 4, wherein the control board is fixed to the holding surface outside a projection surface area of the control board by providing a cutout in the control board. The presser piece is
The inverter-integrated electric compressor according to any one of claims 1 to 5, which is fixed to the holding surface by screwing together with the control board. The switching element is
The inverter-integrated electric compressor according to any one of claims 1 to 6, which is a switching element module that includes a plurality of switching elements and is structurally integrated.

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