JP2016077063A - Installation structure for power transistor, inverter, and inverter integrated motor compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation structure for a power transistor which reduces thermal interference between a plurality of power transistors, making improvement of reliability by suppressing temperature rise compatible with reduction of an arrangement space, shortens an installation time and is capable of improving manufacture efficiency, an inverter and an inverter integrated motor compressor employing the same.SOLUTION: In the installation structure for the power transistor, a plurality of power transistors 25 are disposed in a stationary manner while longitudinally and laterally approaching each other on an installation surface of a heat sink 29. The installation surface at a side of the heat sink 29 on which the power transistor 25 is disposed in the stationary manner is an inclined plane 30 where a side of a lead terminal 25A of each of the power transistors 25 to be installed becomes a higher order and an opposite side becomes a lower order. The inclined planes 30 are in parallel with each other in one direction. On the inclined plane 30, each of the power transistors 25 is disposed in the stationary manner, such that the power transistor is neighboring in an extension direction of the lead terminal 25A and the side of the lead terminal 25A becomes the higher order.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an installation structure of power transistors such as IGBTs constituting an inverter switching circuit, an inverter, and an inverter-integrated electric compressor using the same.

  In electric vehicles, hybrid vehicles, and the like, various devices that are driven by inverter-driven motors are mounted. A vehicle air conditioner is one of them, and an inverter-integrated electric compressor in which an inverter is accommodated in an inverter accommodating portion of a housing is used. An inverter-integrated electric compressor converts DC power supplied from a battery mounted on a vehicle to the inverter into three-phase AC power of a required frequency by the inverter, and converts the power into a motor built in the housing. By applying the voltage via the sealed terminal, the motor is driven and the compressor is driven.

  The inverter is equipped with a substrate on which a switching circuit composed of a plurality of power transistors such as IGBTs is mounted. However, the power transistor is a heat-generating electrical component that maintains its performance and function to ensure reliability. Therefore, it is necessary to dissipate heat appropriately. Therefore, in order to dissipate the heat generated by the low-pressure refrigerant gas flowing in the housing of the electric compressor, a part of the housing wall constituting the inverter housing portion or a heat conductive metal member installed on the housing wall is used as a heat sink, Conventionally, a configuration in which the power transistor is cooled by bringing the power transistor into contact with each other has been adopted (see Patent Documents 1-4 and the like).

Japanese Patent No. 4538359 JP 2007-198341 A JP 2014-101823 A JP 2014-131445 A

  As described above, a plurality of (for example, six) power transistors are used in the inverter switching circuit. However, there is a great need for downsizing and compacting the inverter and the electric compressor. Often done. For this reason, in addition to self-heating, there is a tendency that the temperature easily rises due to thermal interference from the adjacent power transistor, and there is a concern that the reliability of the power transistor is lowered due to thermal stress. In other words, the arrangement interval of the plurality of power transistors has a trade-off relationship between the magnitude of thermal interference and the arrangement space.

  On the other hand, as shown in Patent Document 4, a heat dissipation block is provided, and power transistors are dispersedly arranged on both side surfaces and angled inclined surfaces. However, when fixing the power transistors to the installation surface, the power transistors are viewed from different directions. It must be screwed with screws, and the screwing direction and angle of the driver must be changed each time. For this reason, not only the moving distance of the tool becomes long, but also the moving path becomes complicated, so that it takes time to install and the manufacturing efficiency is lowered.

  The present invention has been made in view of such circumstances, and reduces thermal interference between a plurality of power transistors arranged close to each other, improving reliability by suppressing temperature rise and reducing arrangement space. An object of the present invention is to provide a power transistor installation structure, an inverter, and an inverter-integrated electric compressor using the power transistor, which can reduce the installation time and increase the manufacturing efficiency while making space compatible.

In order to solve the above-described problems, the power transistor installation structure, the inverter, and the inverter-integrated electric compressor using the power transistor of the present invention employ the following means.
That is, the power transistor installation structure according to the present invention is a power transistor installation structure in which a plurality of power transistors are fixedly arranged close to each other on the installation surface of the heat sink. The installation surface on the heat sink side is an inclined surface in which the lead terminal side of each installed power transistor is high and the opposite side is low, and each inclined surface is a surface parallel to one direction, and the inclined surface is On the other hand, each of the power transistors is fixedly disposed adjacent to the extending direction of the lead terminal so that the lead terminal side is at a high level.

  According to the present invention, the installation surface on the heat sink side where the plurality of power transistors are fixedly arranged is an inclined surface in which the lead terminal side of each installed power transistor is high and the opposite side is low, and each inclined surface is The power transistors are arranged in parallel with each other, and each power transistor is fixedly arranged so that the lead terminal side is at a high level adjacent to the extending direction of the lead terminal with respect to the inclined surface. A plurality of power transistors are arranged adjacent to each other in the extension direction of the lead terminal by fixing and arranging each power transistor so that the lead terminal side is high with respect to the inclined surfaces parallel to one direction which are low on the opposite side. Longer heat conduction paths between adjacent power transistors while maintaining a narrow spacing between power transistors, reducing mutual heat interference It is possible. Therefore, the temperature rise of each power transistor can be suppressed, the reliability against thermal stress can be improved, the arrangement interval can be made as narrow as possible, and the arrangement space can be reduced. In addition, since a plurality of power transistors can be screwed to the inclined surface from one direction, the installation time can be shortened and the manufacturing efficiency can be increased by simplifying the movement distance and path of the tool to be short.

  Furthermore, the power transistor installation structure of the present invention is characterized in that, in the power transistor installation structure described above, a space for screwing the power transistor is provided on the lower side of the inclined surface.

  According to the present invention, since the space for screwing the power transistor is provided on the lower side of the inclined surface, when the power transistor is screwed to the inclined surface via a screw or the like, the screwing space is operated by a tool. Workability can be secured as a space. Therefore, it is possible to facilitate the installation of the power transistor on the inclined surface and increase the manufacturing efficiency.

  Furthermore, in the power transistor installation structure of the present invention, in any one of the power transistor installation structures described above, the inclination angle of the inclined surface ranges from 15 ° to 45 ° with respect to the installation surface of the heat sink. It is characterized by being.

  According to the present invention, since the inclination angle of the inclined surface is in the range of 15 ° or more and 45 ° or less with respect to the installation surface of the heat sink, the inclination angle of the inclined surface is a heat conduction path between adjacent power transistors. It is possible to reduce the mutual interference of heat by extending the length of the power source, and at the same time, the angle can be set to an appropriate angle that satisfies both conditions, which should ensure workability when installing each power transistor. Accordingly, it is possible to prevent the installation property from being deteriorated due to the inclined installation surface of the power transistor.

  Furthermore, the installation structure of the power transistor of the present invention is the installation structure of any of the power transistors described above, between the plurality of power transistors arranged adjacent to each other in the direction orthogonal to the extension direction of the lead terminal, A groove having a predetermined depth is provided on the installation surface side of the heat sink.

  According to the present invention, a groove having a predetermined depth is provided on the heat sink installation surface side between the plurality of power transistors arranged adjacent to each other in a direction orthogonal to the extension direction of the lead terminal. Mutual interference of heat between a plurality of power transistors arranged in a direction orthogonal to the extension direction can be reduced by lengthening the heat conduction path through a groove provided therebetween. Therefore, it is possible to reliably reduce the mutual heat interference between the plurality of power transistors arranged vertically and horizontally on the heat sink, suppress the temperature rise of each power transistor, improve the reliability against thermal stress, and the arrangement. The interval can be made as narrow as possible, and the arrangement space can be reduced.

  Furthermore, an inverter according to the present invention includes a substrate on which a switching circuit including a plurality of power transistors and a control circuit are mounted, and converts the power from a power source into required power and applies it to a motor. Is one of the above-described installation structures.

  According to the present invention, in an inverter that includes a substrate on which a switching circuit and a control circuit including a plurality of power transistors are mounted, and that converts power from a power source into required power and applies it to a motor, Therefore, it is possible to improve the reliability against thermal stress of multiple power transistors that constitute the inverter switching circuit, and to reduce the arrangement space as much as possible to reduce the arrangement space. It can be made into a space. Therefore, the heat resistance performance of the inverter can be further improved, and the substrate on which the power transistor is mounted can be reduced in size, and thus the inverter can be reduced in size.

  Further, the inverter-integrated electric compressor according to the present invention is provided with an inverter housing portion provided in a housing in which a compression mechanism and a motor are built, and an inverter for driving the motor is integrally incorporated in the inverter housing portion. In the integrated electric compressor, the inverter is the above-described inverter.

  According to the present invention, in the inverter-integrated electric compressor in which the inverter housing portion is provided in the housing in which the compression mechanism and the motor are built, and the inverter for driving the motor is integrally incorporated in the inverter housing portion. Is the above-mentioned inverter, improving the heat resistance performance of inverters used in harsh heat-resistant environments, improving its reliability and controllability, and further downsizing the inverter housing by downsizing the inverter be able to. Therefore, the inverter-integrated electric compressor can be improved in performance and size, and its mounting property can be improved.

  According to the power transistor installation structure of the present invention, each power transistor is fixedly arranged so that the lead terminal side is high with respect to the inclined surfaces parallel to one direction where the lead terminal side is high and the opposite side is low. The heat conduction path between a plurality of adjacent power transistors is lengthened while the arrangement interval of the plurality of power transistors arranged adjacent to each other in the extension direction of the lead terminal is maintained at a narrow interval, thereby reducing mutual heat interference. Therefore, the temperature rise of each power transistor can be suppressed, the reliability against thermal stress can be improved, the arrangement interval can be made as narrow as possible, and the arrangement space can be reduced. In addition, since a plurality of power transistors can be screwed to the inclined surface from one direction, the installation time can be shortened and the manufacturing efficiency can be increased by simplifying the movement distance and path of the tool to be short.

  Further, according to the inverter of the present invention, the reliability against thermal stress of the plurality of power transistors constituting the inverter switching circuit can be improved, and the arrangement interval is made as narrow as possible, thereby reducing the arrangement space. Therefore, the heat resistance performance of the inverter can be further improved, and the substrate on which the power transistor is mounted can be reduced in size, and thus the inverter can be reduced in size.

  Further, according to the inverter-integrated electric compressor of the present invention, the heat resistance performance of the inverter used in a severe heat-resistant environment is improved, the reliability and controllability are improved, and the inverter housing is reduced by downsizing the inverter. Since it can be made more compact, the inverter-integrated electric compressor can be improved in performance and size, and its mountability can be improved.

It is sectional drawing of the inverter integrated electric compressor which concerns on one Embodiment of this invention. They are the front view (A) which shows the installation structure of the power transistor adjacent to the lead terminal direction of the inverter in the said electric compressor, and its side view (B). They are the front view (A) which shows the installation structure of the power transistor adjacent to the lead terminal direction of the said inverter orthogonally, the side view (B), and the top view (C).

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a sectional view of an inverter-integrated electric compressor according to an embodiment of the present invention, and FIGS. 2 and 3 are front views (A) showing a power transistor installation structure in the inverter. A side view (B) and a top view (C) thereof are shown.
The inverter-integrated electric compressor 1 includes a cylindrical housing 2, one end of which is sealed by a compressor-side end housing 3 and the other end is sealed by a motor-side end housing 4.

  A known scroll compression mechanism (compression mechanism) 7 including a pair of fixed scroll 5 and orbiting scroll 6 is incorporated on one end side of the cylindrical housing 2, and the high-pressure refrigerant gas compressed by the compression mechanism 7. Is discharged into the discharge chamber 10 via the discharge port 8 and the discharge valve 9 and discharged from there. The fixed scroll 5 of the scroll compression mechanism 7 is fixed to the compressor-side end housing 3 with bolts 11, and the orbiting scroll 6 is supported by the thrust bearing 12 so as to be orbitable via rotation prevention means such as an Oldham link 13. ing.

  A motor 16 including a stator 14 and a rotor 15 is incorporated on the other end side of the cylindrical housing 2, and a drive shaft 17 is integrally coupled to the rotor 15 of the motor 16. The drive shaft 17 is rotatably supported by a bearing 19 installed near the center in the housing 2 and a bearing 20 provided on the inner surface of the motor-side end housing 4, and a crank provided at one end thereof. The pin 18 is connected to the orbiting scroll 6 via the drive bush 21 and the orbiting bearing 22, so that the orbiting scroll 6, that is, the scroll compression mechanism 7 can be driven.

  On the other hand, an inverter accommodating portion 23 is integrally formed on the outer surface side of the motor-side end housing 4, and an inverter 24 that drives the motor 16 is accommodated and installed therein. The inverter 24 converts DC power supplied from an external battery or the like into three-phase AC power having a required frequency, and applies it to the motor 16 via a sealed terminal (not shown) penetrating the motor-side end housing 4. Thus, the motor 16 is driven.

  The inverter 24 itself is based on a power board 26 on which a switching circuit composed of a plurality of (six) power transistors 25 such as an IGBT which is a semiconductor switching element for power, for example, and a control signal input from the outside. A control board 27 on which a control circuit composed of elements operating at a low voltage, such as a CPU for controlling the switching circuit, and the like, and electrical components such as a smoothing capacitor and a coil constituting a filter circuit for noise removal 28, which are known per se.

  In the inverter 24 in this embodiment, the power board 26 and the control board 27 are separately provided in two layers and arranged in two layers. However, in the present invention, the above-described circuit is provided in one sheet. Needless to say, those mounted on a substrate are included.

  The plurality of power transistors 25 constituting the switching circuit of the inverter 24 are exothermic electrical components, and in order to maintain the performance and function, it is necessary to ensure heat dissipation and suppress the temperature rise. In this type of inverter-integrated electric compressor 1, a refrigerant suction port is provided at one end portion of the housing 2 on the motor 16 side, low-pressure refrigerant gas is sucked into the housing 2 from the suction port, and the refrigerant is supplied to the housing 2 and the stator. By adopting a configuration in which the scroll compression mechanism 7 is sucked through the flow path between 14 and the motor gap, a part of the housing wall constituting the inverter accommodating portion 23 or a heat conductive metal member provided on the housing wall is used as a heat sink. The heat generated by the power transistor 25 is usually dissipated to the refrigerant.

  Also in the present embodiment, the heat sink 29 is formed by a part of a housing wall such as the housing 2 and the motor side end housing 4 whose inner side surface is a flow surface of the low-pressure refrigerant gas or a heat conductive metal member provided on the housing wall. The power transistor 25 is brought into contact with the installation surface of the heat sink 29 and fixedly arranged so that the power transistor 25 can be cooled with the low-pressure refrigerant gas.

  At this time, it is desirable that the plurality of power transistors 25 be arranged as close as possible in order to reduce the arrangement space and the size of the substrate 26, and in turn to make the inverter 24 small and compact. However, the closer the power transistors 25 are arranged, the greater the mutual thermal interference during heat generation. In particular, the power transistors 25 adjacent to each other in the extending direction of the lead terminal 25A are susceptible to thermal interference.

  Therefore, in the embodiment, as shown in FIG. 2, the installation surface on the heat sink 29 side of the plurality of power transistors 25 arranged adjacent to each other in the extending direction of the lead terminal 25 </ b> A is arranged on the lead terminal 25 </ b> A side of each power transistor 25. The inclined surface 30 is a high level and the opposite side is a low level, and the inclined surfaces 30 are parallel to each other in one direction, and each power transistor 25 is connected to each inclined surface 30 at the high level on the lead terminal 25A side. Thus, it is set as the structure fixedly arranged by screwing via screws 31 or the like.

  As described above, the plurality of power transistors 25 arranged adjacent to each other in the extending direction of the lead terminal 25A are inclined surfaces 30 having a sawtooth-shaped cross section with the lead terminal 25A side of the installation surface on the heat sink 29 side being higher. It is possible to suppress the mutual interference of the generated heat by using a structure in which the heat conduction path between the adjacent power transistors 25 is lengthened.

  The angle of the inclined surface 30 is not particularly limited, but the heat conduction path between the power transistors 25 is lengthened to reduce mutual heat interference, and at the same time, each power transistor 25 is screwed with a screw 31. It is desirable to make the angle within an appropriate range that can satisfy both conditions, which should ensure workability when fixing, and set the angle within the range of 15 ° to 45 ° with respect to the installation surface of the heat sink 29. ing.

  Further, each power transistor 25 is fixed with screws via screws 31, but is tightened and fixed using a tool such as a screwdriver. At this time, since the inclined surfaces 30 are parallel to each other in one direction, it is possible to shorten and simplify the moving distance and path of the tool, but depending on the inclination angle, the lower side of the inclined surface 30 may be Since it may be difficult to operate the tool because it is lowered, it is desirable to provide a screw fixing space 32 of a certain size on the lower side of the inclined surface 30.

  Further, as described above, among the plurality of power transistors 25, the thermal interference between the power transistors 25 arranged adjacent to each other in the extending direction of the lead terminal 25A is particularly large. Reducing the thermal interference between the power transistors 25 adjacent to each other in a direction orthogonal to the power transistor 25 is also beneficial in arranging the power transistors 25 closer to each other. In the present embodiment, as shown in FIG. 3, a groove (gap) 33 having a predetermined depth is provided on the installation surface on the heat sink 29 side between the power transistors 25 adjacent to each other in the direction orthogonal to the extending direction of the lead terminal 25A. The heat conduction path between the power transistors 25 is lengthened to suppress mutual heat interference.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
The inverter-integrated electric compressor 1 converts DC power supplied from an external power source into three-phase AC power having a required frequency by an inverter 24 and applies the three-phase AC power to the motor 16 to rotate the motor 16. Driven, the scroll compression mechanism 7 is driven. By driving the motor 16 and the scroll compression mechanism 7, the low-pressure refrigerant gas is sucked into the housing 2 from the refrigeration cycle side, and the low-pressure refrigerant gas flows along the motor-side end housing 4 and the inner surface side of the housing 2. And compressed into a high-temperature and high-pressure gas and then discharged to the outside.

  In the meantime, in the inverter 24, the plurality of power transistors 25 constituting the switching circuit repeats the switching operation. At this time, heat is generated and the temperature rises. In the present embodiment, this heat is radiated to a heat sink 29 constituted by a part of the housing wall of the motor side end housing 4 or a heat conductive metal member provided on the housing wall, and further from the heat sink 29 to the motor side end. The plurality of power transistors 25 are cooled by dissipating heat to the low-pressure refrigerant gas flowing along the inner surface of the housing 4.

  Here, the plurality of power transistors 25 are fixedly arranged on the installation surface of the heat sink 29 in a state where they are close to each other in the vertical and horizontal directions. As the arrangement interval is reduced, the arrangement space and the size of the substrate 26 are reduced. Although the inverter 24 can be reduced in size and size, if the arrangement interval is made too close and close to each other, the mutual thermal interference between the adjacent power transistors 25 becomes large, and the temperature of the power transistors 25 easily rises.

  However, in this embodiment, the installation surface on the heat sink 29 side where the plurality of power transistors 25 are fixedly arranged is an inclined surface 30 in which the lead terminal side 25A of each installed power transistor 25 is high and the opposite side is low. In addition, the inclined surfaces 30 are parallel to each other in one direction, and a plurality of power transistors 25 are adjacent to the inclined surface 30 in the extending direction of the lead terminal 25A, and the lead terminal side 25A is at a high level. It is set as the structure fixedly arranged through the screw | thread 31 so that it may become.

  Thus, each power transistor 25 is fixedly arranged so that the lead terminal 25A side is at a high level with respect to the inclined surfaces 30 parallel to one direction, the lead terminal 25A side being at a high level and the opposite side being at a low level. Thus, the heat conduction path between the plurality of power transistors 25 adjacent to each other in the direction of the lead terminal 25A is lengthened while the interval between the plurality of power transistors 25 disposed adjacent to the extension direction of the lead terminal 25A is kept narrow. In addition, the mutual interference of heat can be reduced.

  For this reason, the temperature rise of each power transistor 25 can be suppressed, the reliability against thermal stress can be improved, and the arrangement interval can be made as narrow as possible to reduce the arrangement space of the power transistor 25. And the size of the substrate 26 can be reduced. In addition, since a plurality of power transistors 25 can be screwed to the inclined surface 30 parallel to one direction with a screw 31 from one direction, the installation time can be shortened by simplifying the moving distance and path of the tool. Efficiency can be increased.

  In addition, a screwing space 32 for the power transistor 25 is provided on the lower side of the inclined surface 30. For this reason, when the power transistor 25 is screwed to the inclined surface 30 via the screw 31, workability can be ensured by using the screwing space 32 as an operation space for a tool such as a screwdriver. Therefore, the installation of the power transistor 25 with respect to the inclined surface 30 can be facilitated and the manufacturing efficiency can be increased.

  Furthermore, in this embodiment, since the inclination angle of the inclined surface 30 is in the range of 15 ° or more and 45 ° or less with respect to the installation surface of the heat sink 29, the inclination angle of the inclined surface 30 is set to the adjacent power transistor 25. The heat conduction path between them can be lengthened to reduce the mutual interference of heat, and at the same time, the workability when installing each power transistor 25 should be ensured at an appropriate angle that satisfies both conditions. . As a result, it is possible to prevent a decrease in installation property due to the installation surface of the power transistor 25 being the inclined surface 30.

  In the present embodiment, a groove 33 having a predetermined depth is provided on the installation surface side of the heat sink 29 between the plurality of power transistors 25 arranged adjacent to each other in the direction orthogonal to the extending direction of the lead terminal 25A. The mutual heat interference between the plurality of power transistors 25 arranged in the direction orthogonal to the extending direction of 25A can be reduced by lengthening the heat conduction path through the groove 33. For this reason, the mutual interference of heat between the plurality of power transistors 25 arranged vertically and horizontally on the heat sink 29 can be reliably reduced, the temperature rise of each power transistor 25 can be suppressed, and the reliability against thermal stress can be improved. In addition, the arrangement interval can be made as narrow as possible, and the arrangement space can be reduced.

  In addition, it is possible to improve the reliability against thermal stress of the plurality of power transistors 25 that constitute the switching circuit of the inverter 24 that converts the power from the power source into the required power and applies it to the motor, and allows the arrangement interval to be varied. Since the arrangement space can be reduced as much as possible, the heat resistance performance of the inverter 24 can be further improved, and the substrate 26 on which the power transistor 25 is mounted can be downsized. Miniaturization can be achieved.

  In addition, in the inverter-integrated electric compressor 1 having a configuration in which the inverter 2 is provided in the housing 2 and the inverter 24 for driving the motor 16 is integrally incorporated in the inverter housing 23. By adopting the above configuration, the heat resistance performance of the inverter 24 used in a severe heat-resistant environment can be improved and the reliability and controllability can be improved. At the same time, the inverter housing 23 is made more compact by downsizing the inverter 24. Therefore, the inverter-integrated electric compressor 1 can be improved in performance and size, and its mounting property can be improved.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the above-described embodiment, the groove 33 having a predetermined depth is provided on the installation surface side of the heat sink 29 between the plurality of power transistors 25 arranged adjacent to each other in the direction orthogonal to the extending direction of the lead terminal 25A. However, in addition to or instead of the groove 33, the inclined surface 30 is one side in the direction orthogonal to the extending direction of the lead terminal 25A. It is good also as a structure inclined to.

  Moreover, although the said embodiment demonstrated the example of the inverter integrated electric compressor 1 provided with the scroll compression mechanism 7, the compression mechanism 7 is not limited to a scroll type, The compression mechanism of various types was used. Of course, it may be a thing. Furthermore, the position of the inverter accommodating portion 23 provided on the housing 2 side of the electric compressor 1 is not limited to the end face side of the cylindrical housing 2 but may be the outer peripheral position of the cylindrical housing 2.

1 Inverter-integrated electric compressor 2 Housing 4 Motor side end housing 7 Scroll compression mechanism (compression mechanism)
16 Motor 23 Inverter receiving portion 24 Inverter 25 Power transistor 25A Lead terminal 26 Power substrate (substrate)
29 Heat sink 30 Inclined surface 31 Screw 32 Screw fixing space 33 Groove

Claims (6)

In the power transistor installation structure in which a plurality of power transistors are fixedly arranged close to each other vertically and horizontally on the installation surface of the heat sink,
The installation surface on the heat sink side where the power transistor is fixedly arranged is an inclined surface in which the lead terminal side of each installed power transistor is high and the opposite side is low, and the inclined surfaces are parallel to each other in one direction. Face and
An installation structure of a power transistor, wherein each power transistor is fixedly disposed adjacent to the inclined surface in the extension direction of the lead terminal so that the lead terminal side is at a high level.   The power transistor installation structure according to claim 1, wherein a space for screwing the power transistor is provided on a lower side of the inclined surface.   3. The power transistor installation structure according to claim 1, wherein an inclination angle of the inclined surface is in a range of 15 ° to 45 ° with respect to an installation surface of the heat sink.   The groove having a predetermined depth is provided on the installation surface side of the heat sink between the plurality of power transistors arranged adjacent to each other in a direction orthogonal to the extension direction of the lead terminal. 4. An installation structure of the power transistor according to any one of 1 to 3. In an inverter that includes a substrate on which a switching circuit and a control circuit including a plurality of power transistors are mounted, converts power from a power source into required power, and applies it to a motor.
An inverter characterized in that the power transistor has the installation structure according to any one of claims 1 to 4. In an inverter-integrated electric compressor in which an inverter accommodating portion is provided in a housing incorporating a compression mechanism and a motor, and an inverter that drives the motor is integrally incorporated in the inverter accommodating portion.
An inverter-integrated electric compressor, wherein the inverter is the inverter according to claim 5.

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