WO2019194311A1

WO2019194311A1 - Power conversion device

Info

Publication number: WO2019194311A1
Application number: PCT/JP2019/015190
Authority: WO
Inventors: 恒之齋藤; 直記岩上; 山口　康夫; 久嗣藤原; 中村　圭吾
Original assignee: 日本電産株式会社; 日本電産エレシス株式会社
Priority date: 2018-04-06
Filing date: 2019-04-05
Publication date: 2019-10-10
Also published as: CN112005483A; JPWO2019194311A1; JP7264159B2; DE112019001813T5

Abstract

[Problem] To provide a power conversion device including a cooling structure that can reduce the weight of the power conversion device. [Solution] This power conversion device according to one embodiment is provided with a power module, a capacitor disposed above the power module, an accessory drive unit disposed above the capacitor, and a housing that accommodates the power module, the capacitor, and the accessory drive unit, wherein: the housing comprises a base section, a side section erected on the base section, and a cover section that closes an upper opening section of the side section; the power module is mounted on the base section of the housing; and the base section of the housing is provided with a cooling channel through which a coolant that cools the power module flows.

Description

Power converter

The present invention relates to a power conversion device.

Since the power converter has a component that generates heat (for example, an inverter circuit), it often has a cooling structure to cool the component that generates heat. For example, Patent Document 1 discloses a power conversion device having a relay flow path forming body in order to configure a cooling water channel that cools a power module that converts a direct current into an alternating current.

JP 2012-249482 A

However, in the power conversion device of Patent Document 1, the volume occupied by the relay flow path forming body in the power conversion device is large, and the weight of the relay flow path forming body is also large. Therefore, the weight of the power conversion device increases.

In view of the above problems, an object of the present invention is to provide a power converter having a cooling structure that can reduce the weight of the power converter.

One aspect of the power conversion device of the present invention includes a power module, a capacitor disposed on the power module, an auxiliary drive unit disposed on the capacitor, the power module, the capacitor, and A power conversion device comprising a housing for housing the auxiliary drive unit, wherein the housing covers a bottom portion, a side portion standing up from the bottom portion, and an upper opening of the side portion. The power module is placed on the bottom of the casing, and a refrigerant flow path through which a refrigerant that cools the power module flows is provided at the bottom of the casing.

According to the present invention, the number of parts can be reduced and the weight of the power converter can be reduced.

FIG. 1 is a perspective view showing a power conversion device according to an embodiment of the present invention together with a motor unit, a gear unit, and a generator. FIG. 2 is a perspective view of the state of FIG. 1 viewed from the back of the power converter. FIG. 3 is a perspective view of the state of FIG. 1 as viewed from above. FIG. 4 is a perspective view of the state of FIG. 1 viewed from the generator side. FIG. 5 is a perspective view of the state of FIG. 1 viewed from below. FIG. 6 is a perspective view showing a state where the generator is removed from the state of FIG. FIG. 7 is a perspective view showing a state where the second housing of the generator is removed from the state of FIG. FIG. 8 is a perspective view showing a state in which the gear portion is removed from the state of FIG. FIG. 9 is a perspective view of the power converter as viewed from the front. FIG. 10 is a plan view of the power conversion device in a state where the lid is removed from the state of FIG. FIG. 11 is a perspective view of the power converter as viewed from the right side. FIG. 12 is a perspective view of the power converter as viewed from the left side. FIG. 13 is a perspective view of the power converter as viewed from below. FIG. 14 is a bottom view of the power converter. FIG. 15 is a cross-sectional view taken along the line AA of the power converter. FIG. 16 is a perspective view of the top cover of the housing. FIG. 17 is a perspective view of the top cover viewed from another direction. FIG. 18 is a perspective view of the top cover as viewed from below. FIG. 19 is a perspective view of the power converter with the top cover removed from the state of FIG. FIG. 20 is a perspective view showing a state where the motor three-phase wire and the actuator driving unit are removed from the state shown in FIG. FIG. 21 shows the same state as FIG. 20, but is a perspective view seen from a different direction. FIG. 22 is a perspective view of the power conversion apparatus with the bus bar and the control board removed from the state of FIG. FIG. 23 is a cross-sectional view of the power conversion device taken along the line BB. FIG. 24 is a perspective view showing the housing body and the power module. FIG. 25 is a perspective view showing the housing body. FIG. 26 is a perspective view of the housing body viewed from another direction.

Hereinafter, a power converter according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. In the following drawings, the scale and number of each structure may be different from the scale and number of the actual structure in order to make each configuration easy to understand.

In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction, and is the height direction of the power converter in FIGS. 1 and 2. The X-axis direction is a direction orthogonal to the Z-axis direction. The Y-axis direction is the width direction (left-right direction) of the power converter in FIGS. 1 and 2. The X-axis direction is a direction orthogonal to both the Y-axis direction and the Z-axis direction.

In the following description, the height direction (Z-axis direction) of the power conversion device is the vertical direction. The positive side (+ Z side) in the Z-axis direction with respect to a certain object is sometimes referred to as “upper side”, and the negative side (−Z side) in the Z-axis direction with respect to a certain object is referred to as “lower side”. There is a case. The front-rear direction, the front side, and the rear side are names used for explanation only, and do not limit the actual positional relationship and direction. In this embodiment, a case where the −Z side is viewed from above (+ Z side) in the Z-axis direction is referred to as a plan view.

FIG. 1 is a perspective view showing a state in which the power conversion device 10 of the present embodiment is attached to a motor unit 20 and a gear unit (gear mechanism) 30 together with a generator 40. FIG. 2 is a perspective view of the state of FIG. FIG. 3 is a perspective view of the state of FIG. 1 as viewed from above. FIG. 4 is a perspective view of the state of FIG. 1 viewed from the generator 40 side. FIG. 5 is a perspective view of the state of FIG. 1 viewed from below.

Suppose that the power converter device 10 is arrange | positioned with the motor part 20, the gear part 30, and the generator 40 in the engine room of a motor vehicle in this embodiment. The power conversion device 10 is disposed under the motor unit (vehicle drive motor) 20. An arrow F indicates the front direction of the automobile. With reference to the arrow F, the gear unit 30 is positioned in front of the motor unit 20, and the generator 40 is positioned in front of the gear unit 30. The gear unit 30 is provided with an auxiliary actuator 35 and a parking brake mechanism 60. Arrow F is in the −X direction. In this embodiment, the auxiliary machine is an electric oil pump (not shown), and the auxiliary machine actuator 35 is an actuator that drives the electric oil pump. The generator 40 is disposed adjacent to the gear unit 30. It can be considered that the power conversion device 10, the motor unit 20, the gear unit 30, and the generator 40 constitute a drive system (sometimes simply referred to as "system").

The power converter 10 is connected to the motor unit 20 by a cable 46 and is connected to the generator 40 by a cable 47. Further, the power conversion device 10 is connected to the auxiliary actuator 35 by a cable 48. Reference symbol J indicates the axis of the generator 40. The bottom 24 of the casing 18 of the power conversion device 10 is provided with a refrigerant inlet pipe portion 37 for introducing cooling water (for example, LLC) for cooling the power conversion device 10. LLC is an abbreviation for Long Life Coolant. The refrigerant inlet pipe portion 37 extends from the housing main body 14 in the Y direction. In addition, a refrigerant outlet pipe 38 through which cooling water that has cooled the power conversion device 10 flows is provided at the bottom 24 of the casing 18 of the power conversion device 10. The refrigerant outlet pipe 38 is an S-shaped pipe and extends from the power conversion device 10 to the gear unit 30. The cooling water is an example of a refrigerant, and a refrigerant other than the cooling water (for example, cooling oil) may be used.
The generator 40 includes a first housing 41 including a circular portion 41a from which the shaft J projects and a portion 41b associated with the circular portion 41a, and a second housing 43 to which the first housing 41 is attached. The power conversion device 10 is connected to the generator 40 by a three-phase wire 45.

FIG. 6 is a perspective view showing a state where the generator 40 is removed from the state of FIG. FIG. 6 shows the housing 31 of the gear unit 30, the second housing 43 of the generator 40 attached to the housing 31, and the planetary gear mechanism 32 provided in the housing 31. FIG. 7 is a perspective view showing a state where the second housing 43 of the generator 40 is removed from the state of FIG. FIG. 8 is a perspective view showing a state in which the gear unit 30 is removed from the state of FIG. In FIG. 8, only the casing 21 of the motor unit 30 is shown, and the motor accommodated in the casing 21 is not shown.

FIG. 9 is a perspective view of the power converter 10 as viewed from the front. FIG. 10 is a plan view of the power converter with the lid 27 removed from the state of FIG. FIG. 11 is a perspective view of the power converter as viewed from the right side. FIG. 12 is a perspective view of the power converter 10 viewed from the left side. FIG. 13 is a perspective view of the power converter 10 as viewed from below. FIG. 14 is a bottom view of the power converter 10.
The power conversion device 10 includes a top cover 12 and a housing body 14. The top cover 12 is provided on the housing main body 14, and the top cover 12 and the housing main body 14 constitute a casing 18 of the power conversion device 10. The top cover 12 is fixed to the housing body 14 with bolts 22. The top cover 12 may be referred to as a cover part.

A refrigerant outlet pipe 38 is attached to the front surface 14 a of the housing body 14. Further, the front surface 14a has a cubical convex portion 15 protruding in the direction of the arrow F (front direction). Hereinafter, the convex portion 15 is referred to as a front convex portion 15. A three-phase wire 45 extends from the front surface 15 b of the front convex portion 15. An oblong lid portion 26 is attached to the upper surface 15a of the front convex portion 15 in plan view. The front protrusion 15 is a protrusion that protrudes in the horizontal direction.

The top cover 12 has a flat annular outer peripheral portion (peripheral portion) 12a, a low first convex portion 12b that rises in the Z direction from the inner edge of the annular outer peripheral portion 12a, and a high that rises in the Z direction from the first convex portion 12b. And a second convex portion 16. The first convex portion 12b has a substantially rectangular parallelepiped shape that is long in the Y direction. The second convex portion 16 has a substantially rectangular parallelepiped shape that is long in the X direction. A motor three-phase wire 29 is provided on the left side surface 16 a of the second convex portion 16. The motor three-phase wire 29 extends in the Y direction and connects the power converter 10 to the motor unit 20. An oblong lid portion 27 is attached to the upper surface 16b of the second convex portion 16 in plan view. FIG. 10 shows a state in which the lid 27 is removed. As shown in FIG. 10, when the cover part 27 is removed, it turns out that the 2nd convex part 16 has the oval opening part 17a. The opening 17a is used as a work hole when the

end portions

29a, 29b, and 29c of the motor three-phase wire 29 are screwed (fixed) to the power converter 10. The connection between the end of the motor three-phase wire 29 and the power converter 10 will be described later with reference to FIG. The opening 17a is referred to as a first oval opening 17a in the following description.

As shown in FIG. 11, a DC input portion 51 to which two cables from a vehicle battery (not shown) are connected is attached to the right side surface 15 c of the front convex portion 15 of the housing body 14. A generator connector 52 and a motor connector 53 are attached to the right side surface 14 b of the housing body 14. The generator connector 52 and the motor connector 53 extend in the same direction from the right side surface 14b of the housing body 14 (ie, face in the same direction). Since power from a power source (battery) is supplied to the DC input unit 51, the DC input unit 51 may be referred to as a power connector. Reference numeral 15 d indicates the left side surface of the front convex portion 15. The generator connector 52 is a connector that outputs electric power from the generator drive unit 70. The motor connector 53 is a connector that outputs electric power from the motor drive unit 80.

An actuator connector 54 is attached to the right side surface 16 c of the second convex portion 16 of the top cover 12. The actuator connector 54 extends in the same direction as the generator connector 52 and the motor connector 53. The actuator connector 54 is a connector that outputs electric power from the actuator drive unit 90.
In FIG. 11, the Z direction is the height direction of the housing 18, the X direction is the length direction of the housing 18, and the Y direction is the width direction of the housing 18.

As can be seen by comparing FIG. 12 and FIG. 9, the refrigerant outlet pipe 38 shown in FIG. 9 is removed from the housing body 14 in FIG. 12. Further, the generator three-phase wire 45 is removed from the front convex portion 15. Further, the motor three-phase wire 29 is removed from the second convex portion 16 of the top cover 12.
As shown in FIG. 12, from the front surface 14a of the housing main body 14, the refrigerant | coolant outlet pipe part 39 is extended in the front direction (arrow F). A refrigerant outlet pipe 38 is attached to the refrigerant outlet pipe portion 39. A three-phase line terminal portion 56 is provided on the front surface 15 b of the front convex portion 15. The generator three-phase wire 45 is attached to the three-phase terminal portion 56. A three-phase wire terminal portion 57 is provided on the left side surface 16 a of the second convex portion 16 of the top cover 12. A motor three-phase wire 29 is attached to the three-phase wire terminal portion 57. The three-phase line terminal portion 57 has an oval base 58 that is attached to the left side surface 16 a of the second convex portion 16.

As shown in FIGS. 13 and 14, the bottom 24 of the housing 18 includes a first bottom convex portion 24a, a second bottom convex portion 24b, and a first bottom convex portion 24a that project in the −Z direction. It has the connection convex part 24c connected to the convex part 24b. Further, the bottom 24 of the casing 18 includes an inlet convex portion 24d that connects the first bottom convex portion 24a and the refrigerant inlet pipe portion 37, and an outlet convex portion 24e that connects the second bottom convex portion 24c and the refrigerant outlet pipe portion 39. Have. Since the bottom 24 of the housing 18 is also the bottom of the housing main body 14, reference numeral 24 indicates the bottom of the housing 18 and the bottom of the housing main body.
As shown in FIGS. 1, 2, and 9, the power conversion device 10 is disposed below the motor unit 20 and the gear unit 30. The front convex portion 15 projecting in the direction of arrow F is disposed below the gear portion 30, and the second convex portion 16 projecting in the Z direction is composed of the motor portion 20, the gear portion 30, and the housing main body 14 (the power converter 10 ). An actuator drive unit 90 is accommodated in the second convex portion 16. With this arrangement, an optimally arranged drive system can be provided in the engine room of the automobile.

FIG. 15 is a cross-sectional view taken along the line AA in FIG. As shown in FIG. 15, the housing 18 includes a generator drive unit 70 that drives the generator, a motor drive unit 80 that drives the motor, a film capacitor 88, and an actuator drive unit 90 that drives the actuator. And is housed. The generator drive unit 70 and the motor drive unit 80 are provided on the bottom 24 of the housing 18. More specifically, the generator drive unit 70 is disposed above the first bottom convex portion 24a, and the motor drive unit 80 is disposed above the second bottom convex portion 24b. A film capacitor 88 is disposed above the generator drive unit 70 and the motor drive unit 80. An actuator drive unit 90 is disposed above the film capacitor 88. The generator drive unit 70 is a generator power module, and the motor drive unit 80 is a motor drive power module.

FIG. 16 is a perspective view of the top cover 12. FIG. 17 is another perspective view of the top cover 12. FIG. 18 is a perspective view of the top cover 12 as viewed from below.
The outer peripheral portion 12a of the top cover 12 is an annular portion that defines the outer edge of the top cover 12, and has a plurality of holes 13 through which the bolts 22 pass. The second convex portion 16 of the top cover 12 has a first oval opening 17a on the upper surface 16b and a second oval opening 17b on the left side surface 16a. An oval base 58 of the three-phase wire terminal portion 57 is attached to the second oval opening 17b. The second oval opening 17 b is closed by an oval base 58 of the three-phase line terminal portion 57. The first oval opening 17 a and the second oval opening 17 b are oval openings that are long in the front direction F. The first oval opening 17 a is a window portion that exposes the fixing portion 62 that fixes the wiring 29 to a predetermined location inside the housing 18. The first oval opening 17a is smaller than the second oval opening 17b. The second oval opening 17b is a window portion through which the wiring 29 connecting the power module (motor drive unit 80) to the motor passes.

The top cover 12 also has a rectangular flat plate portion that becomes the upper surface 15 a of the front convex portion 15. The upper surface 15a of the front convex portion has an oval third oval opening 15d that is long in the front direction F. The third oval opening 15d is closed by the lid 26 (FIG. 9).
As shown in FIG. 17, the second convex portion 16 of the top cover 12 has a first connector attachment portion 61 for attaching the actuator connector 54 to the right side surface 16c. The first connector mounting portion 61 has an oval hole 61a. The actuator drive unit 90 is accommodated in the second convex portion 16 of the top cover 12. The actuator drive unit 90 is an accessory drive unit, and is a unit (inverter unit) that drives an electric oil pump and an actuator.

FIG. 19 is a perspective view of the power converter 10 with the top cover 12 removed from the state of FIG. FIG. 20 is a perspective view of a state where the motor three-phase wire 29 and the actuator drive unit 90 are removed from the state of FIG. FIG. 21 shows the same state as FIG. 20, but is a perspective view seen from a different direction. FIG. 22 is a perspective view of the power conversion apparatus in a state where the first bus bar 64, the second bus bar 65, the third bus bar 66, and the control board 68 are removed from the state of FIG. FIG. 23 is a longitudinal sectional view (a sectional view taken along the line BB) of the power converter. FIG. 24 is a perspective view showing the housing and the power module. Reference numeral 71 denotes an IGBT (Insulated Gate Gate Bipolar Transistor) of the generator drive unit 70, and reference numeral 81 denotes an IGBT of the motor drive unit 80. The generator drive unit 70 is an inverter unit, and the motor drive unit 80 is also an inverter unit. The control board 68 controls each component (the generator drive unit 70, the motor drive unit 80, the actuator drive unit 90, etc.) of the power converter 10.

As shown in FIGS. 19 and 20, a first bus bar 64 extending from the motor drive unit 80 and connected to the motor three-phase wire 29 is provided on the actuator drive unit 90. The end portion of the first bus bar 64 is fastened (fixed) to the

end portions

29a, 29b, and 29c of the motor three-phase wire 29 with bolts. A second bus bar 65 extending from the generator drive unit 70 and connected to the generator three-phase terminal 45 is attached to the side surface of the actuator drive unit 90. A third bus bar 66 that distributes the current from the battery from the DC input unit (power input unit) 51 into the power converter 10 is provided in the front convex portion 15. A control board 68 is provided on the film capacitor 88.
The current supplied from the DC input unit (power input unit) 51 to the power converter 10 is supplied to the capacitor 88, the generator drive unit 70, the motor drive unit 80, and the actuator drive unit 90.
As shown in FIGS. 20 and 21, the first bus bar 64 and the third bus bar 66 are laterally arranged (extend in the horizontal direction or the X direction), so that the height of the power converter 10 can be reduced. That is, the arrangement of the first bus bar 64 and the third bus bar 66 realizes downsizing of the power converter 10 in the height direction.
As shown in FIGS. 19 to 21, since the second bus bar 65 is vertically arranged (has a portion extending in the Z direction), the arrangement of the second bus bar 65 realizes a reduction in the size of the power converter 10 in the lateral direction. is doing.
As shown in FIG. 24, the bus bar 67 positioned between the generator drive unit 70 and the motor drive unit 80 is a space for the two

drive units

70 and 80 in the housing 18 of the power conversion device 10. In order to ensure a wide range (in a plan view, it is arranged in a line rather than a rectangle). Further, by arranging the bus bar 67 vertically, noise generated when a current flows through the bus bar 67 can be reduced.

FIG. 25 is a perspective view showing the housing body 14. FIG. 26 is a perspective view of the housing body 14 as seen from another direction.
The housing body 14 has a back surface 14c that connects the rear end portion of the right side surface 14b and the rear end portion of the left side surface 14d, and a front surface 14a that connects the front end portion of the right side surface 14b and the front end portion of the left side surface 14d. From the front surface 14a, an inverted U-shaped convex side portion 14e extends in the front direction F in plan view. In the present embodiment, the front surface 14a, the right side surface 14b, the back surface 14c, the left side surface 14d, and the convex side portion 14e of the housing main body 14 are collectively referred to as a side surface portion (or peripheral portion, side portion) 25 of the housing main body 14. is there. An upper opening 25 a is formed above the side surface portion 25. The housing main body 14 has a side surface portion 25 that rises from the bottom portion 24, and an upper opening 25 a of the side surface portion 25 is closed (closed) by the top cover 12 that is an upper portion of the housing 18.

The bottom 24 of the housing body 14 includes a flat portion 72, a first recess 73, a second recess 74, and a connecting portion 75 that connects the first recess 73 to the second recess 74. The 1st hollow part 73 is a rectangle by planar view. The first recess 73 has an inlet 73 a connected to the inlet protrusion 24 d of the bottom 24 of the housing body 14. The inlet 73a is a recess. Moreover, the 1st hollow part 73 has the flat flat part 73b following the upper end (edge) of the entrance part 73a, and the groove part 73c following the said flat part 73b. A portion where the groove portion 73 c and the connecting portion 75 are connected becomes an outlet 73 d of the first recess portion 73. In plan view, the first depression 73 has four corners, and the inlet 73a is provided at one corner (or the vicinity thereof) of the four corners, and the first depression 73 The outlet is provided at a corner (or the vicinity thereof) at a diagonal of the inlet 73a. That is, the outlet of the first recess 73 is provided at a position farthest from the inlet 73a. The first recess 73 has a predetermined depth and is exposed on the upper surface of the bottom 24 of the housing 18.

The 2nd hollow part 74 is a rectangle by planar view. The second recessed portion 74 has an inlet portion 74 a at a connection location with the connecting portion 75. Moreover, the 2nd hollow part 74 has the groove part 74b following the entrance part 74a, the flat flat part 74c, and the exit part 74d following the said flat part 74b. The exit part 74d is a recess. The exit part 74d is provided on the opposite side of the entrance side (inlet part 74a, groove part 74b) of the second recess part 74. The second depression 74 has a predetermined depth and is exposed on the upper surface of the bottom 24 of the housing 18.
The connection part 75 is a hollow flow path formed in the bottom part 24 of the housing main body 14, and is provided in the connection convex part 24c of FIG. The connection part 75 may be called a connection flow path.

The inlet protrusion 24 d formed on the bottom 24 of the housing body 14 forms a conduit in the bottom 24 of the housing body 14 that guides cooling water to the inlet 73 a of the first recess 73. The cooling water that has flowed to the inlet 73a of the first recess 73 flows to the flat portion 73b of the first recess 73, and then flows to the groove 73c on the back surface 14c side of the housing body 14. The cooling water that has entered the groove 73 c flows through the connecting portion 75 and enters the groove 74 b of the second depression 74. Thereafter, the cooling water flows from the groove 74b to the flat portion 74c and travels toward the outlet 74d. The cooling water flows from the outlet 74d through the outlet recess 24e of the bottom 24 of the housing body 14 to the refrigerant outlet pipe portion 39. The outlet convex portion 24 e formed on the bottom portion 24 of the housing main body 14 forms a conduit for guiding the cooling water to the refrigerant outlet pipe portion 39 in the bottom portion 24 of the housing main body 14. With such a flow of cooling water, the bottom of the generator drive unit 70 and the bottom of the motor drive unit 80 are cooled by the cooling water.

The flow path of the cooling water from the portion where the refrigerant inlet pipe portion 37 is connected to the housing 18 to the refrigerant outlet pipe portion 39 via the first hollow portion 73, the connecting portion 75, and the second hollow portion 74 is: These may be collectively referred to as a refrigerant flow path. In the present embodiment, the refrigerant flow path is provided at the bottom 24 of the housing 18. The outlets (24 e, 39) of the refrigerant flow path are opened in the housing side that faces the gear part 30.

<Effect of embodiment>
According to the present embodiment, a coolant channel (cooling water channel) is provided at the bottom 24 of the housing 18, and the power modules (the generator drive unit 70 and the motor drive unit 80) are disposed on the bottom 24 of the housing 18. On top of this, a film capacitor 88 and an auxiliary drive unit 90 are provided. By forming the refrigerant flow path for cooling the generator drive unit 70 and the motor drive unit 80 in the casing bottom 24 of the power conversion device 10, the relay flow path forming body is not required, so that the number of parts is reduced and the power conversion is performed. The weight of the device 10 can be reduced.
Further, since the accessory drive unit 90 is provided on the upper portion of the casing 18 of the power conversion device 10, a housing or cover for the accessory drive unit becomes unnecessary. As a result, the number of parts of the power conversion device 10 is reduced, and the weight of the power conversion device 10 can be reduced.

Furthermore, assembly of the power converter 10 is facilitated by such a stacked structure. Moreover, the power converter device 10 can be made compact.
The cooling water inlet 73 a and the outlet 73 d of the first depression 73 are provided at corners located on two diagonal lines of the four corners of the first depression 73. Therefore, the cooling water that has entered the first depression 73 does not immediately reach the outlet 73d, but stays in the first depression 73 to some extent and then reaches the outlet 73d. Since cooling water stays in the 1st hollow part 73, a power module (generator drive unit 70) can be cooled efficiently.

The cooling water inlet 74a of the second depression 74 is provided at one corner of the four corners of the second depression 74, and the outlet 74d is located near the corner on the diagonal as viewed from the inlet 74a. Provided (provided on the side facing the groove 74b). Therefore, the cooling water that has entered the second depression 74 does not immediately reach the outlet 74d, but stays in the second depression 74 to some extent and then reaches the outlet 74d. Since the cooling water stays in the second depression 74, the power module (motor drive unit 80) can be efficiently cooled.

In addition, in the power converter device 10 of this embodiment, the following structures are also employable.
In plan view, the outlet 74d of the second recess 74 may be provided on the diagonal line of the inlet 74a. That is, the outlet of the second depression 74 may be provided at a position farthest from the inlet 74a. More specifically, since the second depression 73 has four corners in plan view, the entrance 74a is formed at one corner (or the vicinity thereof) of the four corners. The outlet portion 74d may be provided at a corner portion (or the vicinity thereof) that is opposite to the inlet portion 74a.
Although the auxiliary machine is an electric oil pump, the auxiliary machine may be a water pump or another auxiliary machine.

The attachment of each component is not limited to bolt fastening.
Although the housing 18 has a two-piece structure that can be divided into the top cover 12 and the housing body 14, it may have another structure (for example, a three-piece structure).
Moreover, each structure demonstrated above can be combined suitably in the range which is not mutually contradictory.

DESCRIPTION OF SYMBOLS 10 ... Power converter 12 ... Top cover 14 ... Housing main body 18 ... Housing | casing 24 ... Bottom part 25 ... Peripheral part (side part)
70 ... Generator drive unit 73 ... 1st hollow part 74 ... 2nd hollow part 75 ... Connection part 80 ... Motor drive unit 88 ... Film capacitor 90 ... Actuator drive unit

Claims

A power module;
A capacitor disposed on the power module;
An auxiliary drive unit disposed on the capacitor;
A power conversion device comprising: the power module, the capacitor, and a housing for housing the auxiliary drive unit.
The housing includes a bottom, a side that rises from the bottom, and a cover that closes an upper opening of the side.
The power module is placed on the bottom of the housing,
The power conversion apparatus according to claim 1, wherein a refrigerant flow path through which a refrigerant for cooling the power module flows is provided at a bottom portion of the casing.
The power converter according to claim 1, wherein the power module includes a power module for driving a motor and a power module for a generator.
The power converter according to claim 1 or 2, wherein the auxiliary machine is an oil pump, and the auxiliary machine driving unit is an actuator of the oil pump or an inverter unit that drives the oil pump.
The side portion of the housing includes a plurality of side surfaces, a refrigerant inlet portion of the refrigerant channel is located on one side surface of the plurality of side surfaces, and a refrigerant outlet portion of the refrigerant channel is the first side. The power conversion device according to any one of claims 1 to 3, wherein the power conversion device is located on a side surface different from the one side surface.
The refrigerant flow path is provided at a position different from the first dent portion having a predetermined depth and exposed on the upper surface of the bottom portion of the casing, and the first dent portion described above, and has a predetermined depth. And a second recessed portion exposed on the upper surface of the bottom portion of the housing, and a connecting flow path connecting the first recessed portion and the second recessed portion,
The power conversion device according to any one of claims 1 to 4, wherein the connection flow path is a hollow flow path provided inside a bottom portion of the casing.
The power module includes a motor driving power module and a generator power module,
The power converter according to claim 5, wherein the generator power module is disposed in the first recess, and the motor power module is disposed in the second recess.
The first depression has four corners in plan view, and the refrigerant inlet of the first depression is provided in the vicinity of one corner of the four corners, 7. The power conversion device according to claim 5, wherein a connection portion between the first hollow portion and the connection flow path is provided in the vicinity of a corner portion diagonal to the one corner portion. .
The second depression has four corners in plan view, and the connection portion between the connection channel and the second depression is near one corner of the four corners. The refrigerant outlet portion of the second depression is provided in the vicinity of a corner that is diagonally opposite to the one corner, according to any one of claims 5 to 7. The power converter described.
The side portion of the housing has a protruding portion protruding in a lateral direction, and the protruding portion is provided with a power connector that receives power supplied to the power converter. The power conversion device according to any one of 1 to 8.
The power module includes a motor driving power module and a generator power module,
The side portion of the housing has a plurality of side surfaces, and the first connector that outputs power from the motor power module and the second connector that outputs power from the power module for generator are The power conversion device according to any one of claims 1 to 9, wherein the power conversion device is provided on the same side surface.
The cover portion of the housing has a convex portion for accommodating the auxiliary drive unit, and the convex portion is provided with a third connector for outputting electric power from the auxiliary drive unit. The power converter according to claim 9, wherein
The power converter according to claim 10, wherein the first connector, the second connector, and the third connector are oriented in the same direction.
13. The first cover part according to claim 1, wherein the cover part is provided with a first window part through which a wiring connecting the power module to a motor located in the vicinity of the power converter passes. The power converter according to item.
The cover portion is provided with a second window portion at a position different from the first window portion, and the second window portion exposes a fixing portion that fixes the wiring to a predetermined location inside the housing. The power conversion device according to claim 13, wherein the power conversion device is a window portion.
The power conversion device according to claim 14, wherein the cover portion is provided with a lid portion that closes the second window portion.
A motor that receives power supply from the power conversion device according to any one of claims 1 to 15;
A system comprising: the power conversion device installed under the motor.
The system according to claim 16, wherein a gear mechanism to which an output shaft of the motor is connected is attached to the motor.
The system according to claim 16 or 17, wherein the motor is a motor for driving a vehicle.
The system according to any one of claims 16 to 18, wherein a first cable extends from the side of the casing of the power converter to the motor.
The system according to claim 19, wherein a generator is disposed adjacent to the gear mechanism, and a second cable extends from the side of the casing of the power converter to the generator. .
The system according to claim 19 or 20, wherein an oil pump is provided in the gear mechanism, and a third cable extends from the cover portion of the casing of the power converter to the oil pump. .
The side portion of the housing has a plurality of side surfaces, and the first cable and the second cable extend from the same side surface of the plurality of side surfaces. The system according to any one of the above.
The outlet of the refrigerant flow path provided at the bottom of the casing of the power converter is open to a side of the casing facing the gear mechanism. The system according to item 1.