JP3736526B2 - Inverter power module cooling structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to a technical field of a power module cooling structure of an inverter device that is arranged between a battery that is a DC power source and a rotating electrical machine that is driven by an AC current and performs mutual conversion between the DC current and the AC current.
[0002]
[Prior art]
A conventional cooler of an inverter device has a structure in which heat radiation fins are provided on the wall surface of the water channel behind the heat generating component mounting surface to increase the heat radiation area, and the structure is alternately arranged on both surfaces of the heat generating component. (For example, refer to Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-8468 (FIG. 6).
[0004]
[Problems to be solved by the invention]
However, in the cooler of the conventional inverter device, the shape of the cooler is complicated, and there are many mechanical joint surfaces of the parts constituting the water channel, so that the water tightness of the water channel may be impaired. There was a problem that there were many.
[0005]
Further, since the arrangement of the heat generating components is a planar configuration, there is a problem that there is a limit to the reduction of the installation volume unless the area of the heat radiating surface of the heat generating components is reduced.
[0006]
The present invention was made paying attention to the above problems, and while increasing the number of power modules mounted without impairing the mounting property to the vehicle, it is possible to suppress the heat generation of the power module due to high cooling performance, An object of the present invention is to provide a power module cooling structure for an inverter device that can prevent a short circuit of a high-power component due to leakage of cooling water.
[0007]
[Means for Solving the Problems]
  To achieve the above object, in the power module cooling structure of the present invention, an inverter device that is disposed between a battery that is a DC power source and a rotating electrical machine that is driven by an AC current, and that has a power module by a switching circuit in a casting case. In
The power module is disposed in a vertical orientation with the cooling surface facing outward,
A power module cooling water channel that feeds and drains water from the bottom of the case and passes water in the vertical direction along the vertical wall surface is formed in a casting shape without providing a mechanical joint inside the vertical wall surface provided in the casting case., Without dividing the power module cooling water passage from the bottom of the case into the cooling water ascending passage and cooling water descending passage, and inserting a partition plate that connects both passages at the upper end without providing a mechanical joint A U-shaped cooling water channel is formed integrally.It was.
[0008]
【The invention's effect】
  Therefore, in the power module cooling structure of the inverter device according to the present invention, the power module is arranged vertically, so that the number of power modules mounted is increased without compromising the mountability on the vehicle, but forced water cooling is used. High cooling performance can suppress power module heat generation,U-shapedDo not provide a mechanical joint for the power module cooling water channelHas a partition plateBy forming with a casting shape, it is possible to prevent a short circuit of a high-power component due to leakage of cooling water.
  In addition, the cooling water can be convected up to the upper part of the vertical power module cooling water channel while having a simple configuration of a combination of the power module cooling water channel and the partition plate.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for realizing an inverter device of the present invention will be described based on examples shown in the drawings.
[0010]
(First embodiment)
[Hybrid system]
FIG. 1 is an overall view of a parallel type hybrid system to which the inverter device of the first embodiment is applied. In FIG. 1, E is an engine, M is a multi-axis multilayer motor (rotary electric machine), and G is a Ravigneaux type complex planetary planet. A gear train, D is a drive output mechanism, and I is an inverter device.
[0011]
The engine E is the main power source of the hybrid drive unit, and the engine output shaft 5 is connected to the second ring gear R2 of the Ravigneaux type planetary gear train G via a flywheel damper 6 and a multi-plate clutch 7. Has been.
[0012]
The multi-axis multilayer motor M is a sub-power source having two motor generator functions although it is one motor in appearance. The multi-axis multilayer motor M is disposed in a motor chamber defined by a motor cover 1 and a motor case 2, is fixed to the motor case 2, and is a stator S as a fixed armature wound with a coil, and the stator S The inner rotor IR is arranged on the inner side of the inner rotor IR, and the outer rotor OR is arranged on the outer side of the stator S and the outer rotor OR is embedded on the same axis. A first motor hollow shaft 8 that is an output shaft from the inner rotor IR is connected to a first sun gear S1 of a Ravigneaux type planetary gear train G, and a second motor shaft 9 that is an output shaft from the outer rotor OR is The Ravigneaux type planetary gear train G is connected to the second sun gear S2.
[0013]
Since this multi-axis multilayer motor M drives two rotors IR, OR by one stator S, torque interference should not occur between the respective rotors IR, OR. It is known that when the frequency of voltage and current is mathematically different, the inner product thereof becomes zero and no power is generated. This is also true for current and magnetic flux. Therefore, by changing the number of permanent magnets of each rotor IR, OR, the torque between each rotor IR, OR can be designed to be non-interfering. Further, by making the coil current a composite current, each rotor IR, OR can be controlled independently. As described above, in the multi-axis multilayer motor M of the first embodiment, a six-phase alternating current using a composite current is used as the coil current, the stator S has 18 coils, and the outer rotor OR has a six-pole pair permanent magnet. The inner rotor IR has a three-pole pair permanent magnet.
[0014]
The Ravigneaux type planetary gear train G is a planetary gear mechanism having a continuously variable transmission function that continuously changes the gear ratio by controlling the rotational speed of the power source. The Ravigneaux type planetary gear train G is disposed in a gear chamber defined by the gear housing 3 and the front cover 4, and has a common carrier C that supports the first pinion P1 and the second pinion P2 that mesh with each other, and a first pinion. There are five rotational elements: a first sun gear S1 meshing with P1, a second sun gear S2 meshing with the second pinion P2, a first ring gear R1 meshing with the first pinion P1, and a second ring gear R2 meshing with the second pinion P2. It is configured. A multi-plate brake 10 is interposed between the first ring gear R1 and the gear housing 3. An output gear 11 is connected to the common carrier C.
[0015]
The drive output mechanism D is a mechanism that extends from the output gear 11 connected to the common carrier C of the Ravigneaux type planetary gear train G to the drive wheels. The drive output mechanism D includes an output gear 11, a first counter gear 12, a second counter gear 13, a drive gear 14, a differential 15, and drive shafts 16L and 16R. . The output rotation and output torque from the output gear 11 pass through the first counter gear 12 → second counter gear 13 → drive gear 14 → differential 15 and are transmitted from the drive shafts 16L and 16R to the drive wheels (not shown). The
[0016]
The inverter device I generates electric power by converting the direct current of the battery 17 into a six-phase alternating current by a composite current to drive the two rotors of the multi-axis multilayer motor M and the rotor rotation of the multi-axis multilayer motor M. A function of converting the six-phase alternating current due to the composite current into a direct current to charge the battery 17, and a motor / generator function using one of the two rotors of the multi-axis multilayer motor M as a motor and the other rotor as a generator And a device having
Here, “six-phase alternating current by composite current” means, as shown in FIG. 2, a current (Current 1) with a frequency synchronized with the number of magnetic poles of the outer rotor OR and a current with a frequency synchronized with the number of magnetic poles of the inner rotor IR. (Current2) is combined to form a composite current, and this composite current is shifted in phase by 120 degrees for the outer rotor OR and by 60 degrees for the inner rotor IR, and is shifted in six phases (U phase, U ′ phase, V phase, V phase). 'Phase, W phase, W' phase).
[0017]
The inverter device I is operated by generating a PWM signal in the motor controller 19 based on a command from the hybrid controller 18 and inputting the PWM signal, and performs mutual conversion between a direct current and a composite current as will be described later. It has six intelligent power modules (abbreviation: IPM) by switching circuits to be performed. In addition, when operating one of the two rotors as a motor and the other as a generator, it is only necessary to flow the power corresponding to the difference between the motor driving power and the generated power and the reactive power to the IPM, so that the efficiency can be greatly improved. There is a merit (increasing reactive power can improve efficiency because it deteriorates).
Here, “Intelligent Power Module” means switching element downsizing and low loss, modularization of multiple elements in one package, and intelligentization including base (gate) drive circuit and protection functions. The switching circuit which aimed at.
[0018]
[Coil feeding structure from inverter to motor]
FIG. 3 is a longitudinal side view showing the multi-axis multilayer motor M, and FIG. 4 is a view of the coil feeding structure from the inverter device I to the stator S as viewed from the gear chamber side.
[0019]
The coil feeding structure for supplying the six-phase alternating current by the composite current from the inverter device I to the U-phase coil, V-phase coil, W-phase coil, U′-phase coil, V′-phase coil, and W′-phase coil of the stator S 3, the power supply connection terminal 20, the bus bar radial stack 21, the power connector 22, and the bus bar axial stack 23 are configured. A resolver 24 for detecting the rotation of the inner rotor IR and a resolver 25 for detecting the rotation of the outer rotor OR are provided as sensors for detecting the rotation speed, rotation direction, and rotation position of the rotor, which are necessary information for motor control. It has been.
[0020]
As shown in FIG. 4, the power supply connection terminal 20 is composed of a U-phase V-phase W-phase power supply connection terminal set and a U′-phase V′-phase W′-phase power-supply connection terminal set. Are arranged and fixed at different positions in the circumferential direction of the motor case 2 defining the gear chamber.
[0021]
The bus bar radial laminate 21 is disposed in the gear chamber, and three plates made of a conductive material such as copper are overlapped with each other in a radial direction through a predetermined gap, and the whole including the gap is covered with an insulating resin. It is configured by molding into a cross-sectional shape. Then, as shown in FIG. 4, two sets of the bus bar radial direction laminated bodies 21 are arranged in the radial outer peripheral position of the output gear 11 so as to follow the outer diameter shape of the output gear 11. Coolability is secured by the oil scattered in the outer diameter direction.
[0022]
The power feeding connector 22 is provided through the partition wall 2a between the gear chamber and the motor chamber, and each phase plate of the bus bar radial laminate 21 is connected to one end portion exposed to the gear chamber of each phase power feeding connector 22. is doing.
[0023]
The bus bar axial laminate 23 is fixed to the front end plate of the stator S, and is laminated in the axial direction with an insulating material interposed between each ring-shaped phase plate and the neutral point plate. The whole is sealed with an insulating resin. And each phase electric power feeding connector 22 is connected to each phase electric power feeding part projected inward from the ring-shaped plate, and each phase coil of the stator S is connected to a coil connecting part projected outward from the ring-shaped plate.
[0024]
[Outline of inverter device]
5 is an overall plan view of the inverter device I, FIG. 6 is an overall sectional view of the inverter device I taken along line AA in FIG. 5, and FIG. 7 is an overall sectional view of the inverter device I taken along line BB in FIG. 8 is a bottom view showing an inverter lower case of the inverter device I. FIG.
[0025]
As shown in FIG. 5, the inverter device I includes an intelligent power module 70 (hereinafter referred to as an IPM 70) having a switching circuit that performs mutual conversion between a direct current and a composite current in a lower left region in the inverter upper case 30. .) Is provided. Six IPMs 70 are provided corresponding to each of the six-phase composite currents. The IPMs 70 are divided into two groups of three and three, and the two groups are arranged vertically facing each other.
[0026]
On the DC side of the IPM 70, a DC power supply terminal portion 71 that draws in DC power from the battery 17 and two sheets that connect the DC power supply terminal portion 71 and the DC terminal of the IPM 70 (corresponding to a positive electrode and a negative electrode) ) First DC bus bars 72a, 72b and second DC bus bars 73a, 73b, and three electrolytic capacitors 74 for smoothing voltage fluctuations of the input DC power source due to the influence of the IPM 70.
[0027]
On the AC side of the IPM 70, six AC bus bars 76 (corresponding to six phases) for connecting between the AC terminal of the IPM 70 and the AC terminal of the AC power output terminal portion 75, and a six-phase AC by a composite current are multi-axis multilayer An AC power output terminal portion 75 that outputs to the motor M is provided. In the lower right area, which is a marginal space in the inverter upper case 30, an in-vehicle pump motor inverter 90 for low-pressure driving and an inverter-driven CUP board are installed. An upper cover 31 is fixed on the upper surface of the inverter upper case 30 so as to cover the whole. An inverter lower case 50 and a lower cover 51 are fixed to the bottom surface of the inverter upper case 30.
[0028]
Therefore, when a composite current is applied to the U-phase coil, V-phase coil, W-phase coil, U′-phase coil, V′-phase coil, and W′-phase coil of the multi-axis multilayer motor M, The DC power from the battery 17 is input to the IPM 70 via the first DC bus bars 72a and 72b and the second DC bus bars 73a and 73b. The IPM 70 converts the input DC current into a six-phase alternating current using a composite current. 6-phase alternating current by the combined current is output through the AC bus bar 76 and the AC power supply output terminal 75.
[0029]
As shown in FIGS. 6 and 7, the three electrolytic capacitors 74, the six IPMs 70, and the pump motor inverter 90 are cooled by the condenser cooling water channel 32 formed in the inverter upper case 30 and the IPM cooling. This is performed by forced water cooling that guides cooling water to the water channel 33 and the inverter cooling water channel 34. As shown in FIG. 8, each cooling water channel 32, 33, 34 is connected to a lower case water supply channel 52 and a lower case drain channel 53 formed in an inverter lower case 50 that is fixed to the inverter upper case 30 while maintaining water tightness. A water supply pipe 54 is connected to the lower case water supply path 52, and a drain pipe 55 is connected to the lower case drainage path 53.
[0030]
The cooling action is such that cooling water is supplied from the water supply pipe 54 to the cooling water passages 32, 33, 34 via the lower case water supply passage 52, thereby cooling by taking heat generated in the three electrolytic capacitors 74, 6 The heat generated in each IPM 70 is taken and cooled, and the heat generated in the pump motor inverter 90 is taken and cooled. The heated cooling water is collected in the lower case drainage channel 53 and discharged from the drainage pipe 55.
[0031]
Hereinafter, the configuration, operation, and effect of each of the feature points provided in the inverter device I of the first embodiment will be described in detail.
[0032]
[IPM power supply side structure]
First, the configuration will be described.
[0033]
As shown in FIGS. 5 and 6, three electrolytic capacitors 74 are installed on the power source side of the IPM 70 between the DC power supply terminal portion 71 and the DC terminal of the IPM 70, and the DC power supply terminal portion 71. The three electrolytic capacitors 74 and the DC terminal of the IPM 70 are coupled by first DC bus bars 72a and 72b and second DC bus bars 73a and 73b.
[0034]
The IPM 70 and the electrolytic capacitor 74 are installed on different planes orthogonal to each other, such as installing the IPM 70 on the vertical plane and installing the electrolytic capacitor 74 on the horizontal plane.
[0035]
Furthermore, the electrolytic capacitor 74 installed between the DC power supply lead-in terminal portion 71 and the DC terminal of the IPM 70 is coupled to the first DC bus bars 72a and 72b on the DC power supply lead-in terminal portion 71 side. As shown in FIG. 5, the first DC bus bars 72a and 72b and the second DC bus bars 73a and 73b constituting the DC bus bar are connected so as to be orthogonal to each other, and bolts and nuts are connected to the connecting portions of both bus bars 72a and 73a. 77a is provided, and a bolt / nut 77b is provided at the connecting portion of both bus bars 72b, 73b, and can be separated by the bolt / nut 77a, 77b.
[0036]
Next, the operation will be described.
[0037]
When a rotary electric machine driven by a composite current such as the multi-axis multilayer motor M is driven by an inverter device, the composite current is passed through the IPM. Although this composite current is advantageous to the inverter efficiency by reducing the average value, the peak current increases, and as shown in FIG. 9, the surge voltage generated when the IPM is turned off also increases.
[0038]
When a large surge voltage is generated, it appears as noise in other electronic components including a receiving device such as a radio mounted on the vehicle, and causes a malfunction. For this reason, noise generated from the IPM should be prevented from leaking outside the inverter.
[0039]
On the other hand, in the first embodiment shown in FIGS. 5 and 6, three electrolytic capacitors 74 are installed between the DC power supply lead-in terminal portion 71 and the DC terminal of the IPM 70, thereby causing noise generated in the IPM 70. Can be attenuated and output from the inverter device I.
[0040]
That is, FIG. 10 (a) shows an equivalent circuit of the IPM power supply side structure of the first embodiment, and FIG. 10 (b) shows that the electrolytic capacitor is installed at a position closer to the IPM compared to FIG. 10 (a). The equivalent circuit of the IPM power supply side structure in the case is shown.
In the equivalent circuit of FIG. 10B, an RC filter is formed for the noise source, and the attenuation factor in the high frequency region is −20 [db / dec]. On the other hand, in the equivalent circuit of FIG. 10 (a), an LC filter is configured for the noise source, and has an attenuation factor of −40 [db / dec] in the high frequency region, and FIG. Noise can be greatly attenuated.
[0041]
In the IPM power source side structure of the first embodiment, the IPM 70 and the electrolytic capacitor 74 are installed in different spaces without intersecting the bottom surface of the inverter upper case 30 three-dimensionally. It is possible to provide. Even if an electrolytic capacitor with a small ripple resistance is used, the temperature rise can be suppressed by positively cooling, which greatly contributes to a long life.
[0042]
In the IPM power source side structure of the first embodiment, the first DC bus bars 72a and 72b to which the electrolytic capacitor 74 is connected and the second DC bus bars 73a and 73b to which the IPM 70 are connected can be separated by bolts and nuts 77a and 77b. It has become. This makes it possible to evaluate the dielectric strength of the modules of the second DC bus bars 73a and 73b and the second DC bus bars 73a and 73b, and contribute to investigating the cause in a shorter period when a problem occurs.
[0043]
In the IPM power supply side structure of the first embodiment, since the first DC bus bars 72a and 72b and the second DC bus bars 73a and 73b are orthogonal to each other, electromagnetic noise due to currents flowing through the bus bars can be reduced.
That is, FIG. 11A shows the magnetic flux due to the bus bar current when two DC bus bars are set orthogonally as in the IPM power supply side structure of the first embodiment, and FIG. The magnetic flux by the bus bar current when two DC bus bars are set is shown. In FIG. 11 (b), the magnetic flux due to the currents flowing through the DC bus bars is linked, and a voltage is easily generated in the counterpart DC bus bar. On the other hand, in FIG. 11A, since no voltage is generated with respect to the direction of current, mutual electromagnetic noise can be reduced.
[0044]
Next, the effect will be described.
As described above, in the IPM power supply side structure of the first embodiment, the effects listed below can be obtained.
[0045]
(1) Since the DC power supply terminal portion 71 from the battery 17, the electrolytic capacitor 74, and the DC terminal of the IPM 70 are connected in series by the first DC bus bars 72a and 72b and the second DC bus bars 73a and 73b, It is possible to suppress a current change that causes a surge voltage generated when the IPM 70 is turned off by the inductance of the DC bus bars 72 and 73 and the filter action of the electrolytic capacitor 74. In addition, the filter capacity for reducing radio noise normally used can be reduced, which contributes to cost reduction.
[0046]
(2) Since the power module region in which the IPM 70 is set and the capacitor region in which the electrolytic capacitor 74 is set on different planes on the inverter upper case 30, the electrolytic capacitor 74 can be forcibly cooled. Therefore, even the electrolytic capacitor 74 with a low ripple volume and a small volume can satisfy the performance by cooling. This contributes to cost reduction.
[0047]
(3) Since the first DC bus bars 72a and 72b for coupling the electrolytic capacitor 74 and the second DC bus bars 73a and 73b for coupling the IPM 70 can be separated, each module unit is used for evaluating the insulation and withstand voltage as inverter performance. Can be done. As a result, it is possible to reduce the time required for failure and maintenance checks.
[0048]
(4) Since the first DC bus bars 72a and 72b connecting the plurality of electrolytic capacitors 74 and the second DC bus bars 73a and 73b connecting the plurality of IPMs 70 are installed orthogonal to each other, the first DC bus bars 72a and 72b are connected to each other. The electromagnetic noise caused by the flowing current and the electromagnetic noise flowing through the second DC bus bars 73a and 73b can be reduced.
[0049]
[Electrolytic capacitor cooling structure]
First, the configuration will be described.
[0050]
As shown in FIGS. 5 and 6, the electrolytic capacitor 74 is formed with three capacitor insertion grooves 35 having similar shapes on the capacitor side surface and the capacitor bottom surface in the inverter upper case 30, and the capacitor insertion groove 35 is electrolyzed. It is set by putting the terminals 74a and 74b of the capacitor 74 on the upper surface. The space formed between the outer peripheral surface of the electrolytic capacitor 74 and the groove surface of the capacitor insertion groove 35 is filled with an air layer such as silicon grease to improve heat transfer performance.
[0051]
As shown in FIGS. 6 and 8, a condenser cooling water channel 32 is formed on the outer periphery of the capacitor insertion groove 35 along the side surface shape of the three capacitors, and cooling water (refrigerant) is provided in the capacitor cooling water channel 32. ) To cool the electrolytic capacitor 74 from the side.
[0052]
In the electrolytic capacitor 74, as shown in FIG. 5, the arrangement direction of the + terminal 74a and the-terminal 74b is set to be perpendicular to the direction of current flowing through the first DC bus bars 72a and 72b. Then, only the positive terminal 74a is connected to one first DC bus bar 72a, and only the negative terminal 74b is connected to the other first DC bus bar 72b, whereby the positive terminal 74a and the negative terminal 74b are connected to the first DC bus bars 72a and 72b. They are arranged side by side on a straight line parallel to the current direction.
[0053]
Next, the operation will be described.
[0054]
As shown in FIG. 8, the electrolytic capacitor 74 is cooled by introducing cooling water from a condenser water supply port 56 communicating with the lower case water supply path 52, and flowing through the condenser cooling water path 32 along the three capacitor side surfaces. Side cooling is performed by discharging cooling water from a condenser drain 57 that communicates with the lower case drainage channel 53. Further, as shown in FIG. 6, a lower case drainage channel 53 is disposed at the bottom surface position of the three electrolytic capacitors 74 connected to each other, so that the cooling water of the lower case drainage channel 53 (bottom surface cooling water channel) is used to cool the electrolytic capacitor 74. Bottom cooling is also performed at the same time.
[0055]
Generally, as shown in FIG. 12, an electrolytic capacitor 74 used in an inverter device includes a + terminal 74a, a − terminal 74b, an explosion-proof hole 74c, a rubber packing 74d, a bakelite 74e, a paste-like electrolyte 74f, and an insulation. This structure has a paper 74g and an oxide film 74h.
[0056]
Regarding the electrolytic capacitor 74, it is said that the lifetime is reduced by half when the temperature rises by 10 [degrees], which is a major factor that determines the lifetime of the inverter device I.
[0057]
On the other hand, in the smoothing capacitor arrangement structure of the first embodiment, when the electrolytic capacitor 74 is inserted into the capacitor insertion groove 35 provided in the inverter upper case 30 with both terminals 74a and 74b at the top, as described above, By cooling with cooling water from both the side surface and the bottom surface of the electrolytic capacitor 74, a high cooling effect is expected.
[0058]
Further, regarding the fixing of the electrolytic capacitor 74, in addition to being inserted into the capacitor insertion groove 35 provided in the inverter upper case 30, a band 74 i is provided at a site shown in FIG. 13 and fixed to the inverter upper case 30. Thereby, a sufficient fixing force can be obtained even for a large acceleration input. Further, since the band 74i wound in FIG. 13 is a portion where the rubber packing 74d and the bakelite 74e are present from the structure of the electrolytic capacitor 74 shown in FIG. 12, it is not necessary to cool to this portion. Since both terminals 74a and 74b are on the upper surface, the height of the capacitor insertion groove 35 formed in the inverter upper case 30 can be reduced, which is advantageous in terms of material cost and weight.
[0059]
In the electrolytic capacitor cooling structure of the first embodiment, the arrangement direction of the + terminal 74a and the -terminal 74b is set to be perpendicular to the direction of the current flowing through the first DC bus bars 72a and 72b. As a result, the magnetic flux caused by the plus current and the minus current can be canceled throughout the first DC bus bars 72a and 72b, thereby reducing the mutual inductance of the first DC bus bars 72a and 72b themselves and reducing the influence of electromagnetic noise. it can.
[0060]
In the electrolytic capacitor cooling structure according to the first embodiment, terminals having the same polarity are always arranged on one side, so that the current path can be minimized and the self-inductance can be reduced. In addition, workability is expected to improve.
[0061]
Furthermore, in the electrolytic capacitor cooling structure of the first embodiment, both terminals 74a and 74b are provided at the top, and both terminals 74a and 74b of the electrolytic capacitor 74 are orthogonal to the bus bar current as described above, and The structure in which the terminals having the same polarity are provided in the same row can reduce the surge voltage and effectively remove the generated heat. Therefore, the electrolytic capacitor 74 having a low ripple capacity and a large ESR (equivalent series resistance), that is, an inexpensive capacitor can be applied.
[0062]
Next, the effect will be described.
As described above, in the electrolytic capacitor cooling structure of the first embodiment, the effects listed below can be obtained.
[0063]
(1) Since the side surface of the electrolytic capacitor 74 is cooled by forced water cooling, even a small current ripple capacity can be used without increasing the temperature, that is, with a long life. Further, the capacitor terminal part is protruded to the upper part, and since there is a rubber packing 74d, a bakelite 74e, and both terminals 74a and 74b in this part, there is no need for cooling, so the height of the capacitor insertion groove 35 serving as a cooling cylinder is increased. Can be shortened.
[0064]
(2) Since the bottom surface of the electrolytic capacitor 74 is cooled simultaneously with the side surface cooling of the electrolytic capacitor 74, a high cooling effect of the electrolytic capacitor 74 can be achieved.
[0065]
(3) Since both terminals 74a and 74b of the electrolytic capacitor 74 are arranged perpendicular to the bus bar current, the direction of the current can be made uniform, can be canceled by + and-, and the inductance can be kept small.
[0066]
(4) Since the same-polarity terminals are arranged only on one side, the current density distribution can be made uniform, and the inductance can be reduced as in the case (2). In addition, since a normal electrolytic capacitor 74 is used, erroneous connection can be avoided by setting the same pole to the same position.
[0067]
[Smoothing capacitor arrangement structure]
First, the configuration will be described.
[0068]
In the inverter device I of the first embodiment, as described above, in addition to the three electrolytic capacitors 74 provided in the first DC bus bars 72a and 72b, the film capacitor is connected to the connection portion of the second DC bus bars 73a and 73b on the IPM 70 side. 78 was provided.
[0069]
As shown in FIG. 14, the film capacitor 78 is pre-soldered to the thin plate bus bars 79 and 80 together with the positive and negative second DC bus bars 73a and 73b, and the terminal 81 of the IPM 70 is connected to a bolt 81. It is fixed by tightening together.
[0070]
That is, the vertically arranged IPM 70 is arranged so that the terminals are on the inside and the heat dissipation surface is on the outside, and the positive and negative DC power supply terminal portions 70a and 70b of the IPM 70 are stacked on the U-shaped second DC bus bars 73a and 73b. Is provided. A film capacitor assembly (FIG. 15) in which a film capacitor 78 is pre-soldered to thin plate bus bars 79 and 80 is laminated on the positive and negative DC power supply terminal portions 70a and 70b of the IPM 70 of the second DC bus bars 73a and 73b. It is fixed together with the character-shaped second DC bus bars 73a and 73b.
[0071]
As shown in FIG. 15, the film capacitor assembly includes a conductive thin plate bus bar 79 fastened together with the positive second DC bus bar 73a and a conductive thin plate bus bar fastened together with the negative second DC bus bar 73b. 80 and a plurality of film capacitors 78, and positive and negative conductive thin plate-like bus bars 79 and 80 are provided with terminal-like portions 79a and 80a having terminal-like shapes in order to improve the solderability of the film capacitor 78. The terminals of the film capacitor 78 are soldered to the terminal-like portions 79a and 80a. Needless to say, soldering can be performed by pressure bonding.
[0072]
Next, the operation will be described.
[0073]
When only the electrolytic capacitor 74 is mounted in order to smooth the voltage fluctuation of the input DC power supply, if the switching at the IPM 70 becomes too high, the electrolytic capacitor 74 becomes just a resistance element, and the input DC power supply voltage Smoothing becomes impossible. That is, the upper limit of the switching frequency band is limited by the frequency characteristics of the electrolytic capacitor 74.
[0074]
On the other hand, in the smoothing capacitor arrangement structure of the first embodiment, when the film capacitor 78 having better frequency characteristics than the electrolytic capacitor 74 is used together with the electrolytic capacitor 74, the input in the high frequency region that the electrolytic capacitor 74 cannot handle is used. The DC power supply voltage can be smoothed and the above problem can be solved.
[0075]
However, generally, the film capacitor 78 has a small capacity and many terminals are connected by soldering, and is soldered to the positive and negative second DC bus bars 73a and 73b having a large cross-sectional area in order to cope with a large current. In order to attach them, the second DC bus bars 73a and 73b must be provided with soldering projections.
[0076]
Accordingly, a large number of film capacitors 78 with good frequency characteristics are attached in advance to positive and negative thin plate bus bars 79 and 80 with good solderability to form a film capacitor assembly, and the film capacitor assembly is a positive and negative laminated second DC bus bar for feeding. Along with 73 a and 73 b, the IPM 70 is fastened together with bolts 81, so that a large number of film capacitors 78 can be arranged in the immediate vicinity of the positive and negative DC power supply terminal portions 70 a and 70 b of the IPM 70.
[0077]
In this way, by smoothing the input DC voltage by the film capacitor 78 together with the electrolytic capacitor 74, as shown in FIG. 16, the input DC voltage can be smoothed at the time of switching in a high frequency range that the electrolytic capacitor 74 cannot handle. Since the film capacitor 78 can cope with this, it is possible to stabilize the input DC voltage even during high-frequency switching as compared with the conventional case.
[0078]
Next, the effect will be described.
As described above, in the smoothing capacitor arrangement structure of the first embodiment, the effects listed below can be obtained.
[0079]
(1) Since an electrolytic capacitor 74 that cannot handle high frequencies but has a large capacity and a film capacitor 78 that has a small capacity but excellent frequency characteristics are used in combination, even in a high-speed switching state in a higher frequency range than in the past. The input DC power supply voltage can be stabilized.
[0080]
(2) A film capacitor 78 is pre-soldered to thin plate bus bars 79 and 80 with good solderability to assemble them, and the assembly together with the second DC bus bars 73a and 73b is bolted to the positive and negative direct current power supply terminal portions 70a and 70b Since the structure is fastened together with 81, a large number of film capacitors 78 can be easily installed in the vicinity of the DC power supply terminal portions 70a and 70b of the IPM 70 without creating soldering projections or the like on the DC bus bar for power supply. Can do.
[0081]
[IPM vertical installation structure]
First, the configuration will be described.
[0082]
As shown in FIG. 17, the six IPMs 70 are divided into two groups (three IPMs 70 and three IPMs 70) and are vertically arranged opposite to each other, and a pair of positive and negative power supplies DC current to the IPMs 70. The stacked second DC bus bars 73 a and 73 b have a wide surface shape so as to fill a region surrounded by the DC power supply terminal portions 70 a and 70 b of each IPM 70.
[0083]
The six IPMs 70 are arranged substantially vertically so that the cooling surface 70c faces outward, and a pair of positive and negative second DC bus bars 73a and 73b for supplying a direct current to the IPM 70 are wide peripheral edges at both ends. The second DC bus bars 73a and 73b have a U-shaped cross section as shown in FIG. 18 by standing up substantially vertically and connecting to the IPM 70.
[0084]
When the IPM 70 is vertically arranged oppositely, one of the surfaces for fixing the IPM 70 is provided on the case outer wall 30a of the inverter upper case 30 and the other is provided on the vertical wall 30b inside the case. As shown in FIG. 19, the upper bolt hole 30c and the lower bolt hole 30d to be fixed are provided by penetrating from the case outer wall portion 30a to the inner vertical wall portion 30b.
[0085]
Next, the operation will be described.
[0086]
For example, when a DC current supply bus bar has a surface shape near the electrolytic capacitor but a thin bar shape near the IPM terminal, the inductance in the DC current supply bus bar increases as the distance from the power source increases, and the DC power supply system In terms of electrical characteristics, the switching module is not suitable for expansion.
[0087]
Therefore, if the IPM cooling surface is arranged three-dimensionally to increase the component integration rate and the planar projection area of the inverter device is suppressed and the IPM can be expanded, the surface for cooling the IPM must also be three-dimensional. In addition, the electrical connection method of each IPM, the fixing method to the inverter case, and the processing of the case cooling surface become difficult, and the production cost increases.
[0088]
In contrast, the IPM vertical installation structure of the first embodiment provides a configuration of the inverter device I that has excellent electrical characteristics, good workability at the time of manufacture, and enables three-dimensional arrangement of the IPM 70. Can do.
[0089]
First, since the shape of the pair of the positive and negative second DC bus bars 73a and 73b for feeding a direct current to the IPM 70 is a U-shaped cross section with a wide surface, the current path from the direct current power source to the IPM 70 is configured by a surface. In addition, since the distance is short, low inductance can be realized.
[0090]
That is, the positive and negative DC bus bars for supplying a direct current to each IPM 70 are such that the first DC bus bars 72a and 72b of the DC power supply connection portion are bar-shaped, and the second DC bus bars 73a and 73b of the connection portion to the IPM 70 are wide. Since the wide planar portions are stacked, conductance is obtained in the second DC bus bars 73a and 73b themselves which are DC bus bars. Further, the distance of the current path from the DC power source to each IPM 70 is as small as possible, and the distance between the terminals of each IPM 70 can be substantially equal, so that the second DC bus bar 73a from the DC power source to the IPM 70 can be obtained. 73b can be reduced.
[0091]
Thus, in each IPM 70, since the inductance can be made small and uniform, it is possible to suppress the voltage fluctuation of the direct current generated when the IPM 70 is switched. Furthermore, since the second DC bus bars 73a and 73b that are stacked positive and negative have a three-dimensional structure, a portion to which the IPM 70 is connected can be three-dimensional, so that the IPM 70 is maintained while maintaining the electrical characteristics of realizing a low inductance. The three-dimensional arrangement becomes possible.
[0092]
In addition, when a substantially vertical IPM cooling surface is installed on the inverter upper case 30, bolt holes 30c and 30d of the IPM 70 must be provided on the cooling surface of the vertical wall portion 30b provided inside the case. Therefore, the distance between the cooling surface 30e of the case outer wall portion 30c and the cooling surface 30f of the vertical wall portion 30b is narrow, and the back side of the cooling surface 30f of the vertical wall portion 30b is also reduced as much as possible. For the purpose of reducing the space, there is not enough space to use the drilling tool, so it is difficult to drill the cooling surface 30f of the vertical wall 30b.
[0093]
On the other hand, the upper bolt hole 30c and the lower bolt for fixing the IPM 70 are provided by drilling the outer wall portion 30a and the inner vertical wall portion 30b using a drilling tool from the outside of the inverter upper case 30. The holes 30d are collectively set, and this problem can be solved.
[0094]
Next, the effect will be described.
As described above, in the IPM vertical installation structure of the first embodiment, the effects listed below can be obtained.
[0095]
(1) Six IPMs 70 are divided into two groups by three groups and arranged in opposed relation to each other, and a pair of positive and negative second DC bus bars 73a and 73b that feed DC current to the IPM 70 are connected to the DC of each IPM 70. Since the surface shape is formed so as to fill the region surrounded by the power supply terminal portions 70a and 70b, the inductance of the second DC bus bars 73a and 73b from the DC power source to each IPM 70 is reduced and equalized, thereby switching the IPM 70. The voltage fluctuation of the DC current that occurs sometimes can be suppressed low.
[0096]
(2) Six IPMs 70 are arranged vertically in a vertical direction with the cooling surface 70c facing outward, and the cross-sectional shape of a pair of positive and negative second DC bus bars 73a and 73b that feed DC current to the IPM 70 is wide. Due to the U-shape with the peripheral edges of the shape standing substantially vertically, the three-dimensional vertical arrangement of the IPM 70 maintains the high electrical characteristics of suppressing the voltage fluctuation of the DC current generated when the IPM 70 is switched. Thus, it is possible to cope with the expansion of the IPM 70 without impairing the compactness.
[0097]
(3) Since the upper bolt hole 30c and the lower bolt hole 30d for fixing the IPM 70 vertically opposed to each other are provided by penetrating from the case outer wall portion 30a to the inner vertical wall portion 30b, the inverter upper case 30 can be used. The upper bolt hole 30c and the lower bolt hole 30d for fixing the IPM can be easily processed while saving space as much as possible.
[0098]
[IPM cooling structure]
First, the configuration will be described.
[0099]
As shown in FIG. 7, the IPM cooling structure includes an IPM cooling water passage 33 that allows water to flow in the vertical direction without providing mechanical joints inside the inverter upper case 30 and the inverter lower case 50 of the inverter device I. The IPM 70 is arranged vertically.
[0100]
As shown in FIGS. 20 and 21, the IPM cooling water channel 33 is formed into a casting shape by a flat quadrangular pyramid on a case outer wall portion 30a and an inner vertical wall portion 30b provided in the inverter upper case 30, and the IPM cooling water channel 33 A partition plate 36 separate from the inverter upper case 30 is installed in the water channel 33. And as shown in FIG. 8, it has the structure which supplies cooling water from each IPM water supply path 37 of a case bottom part, and drains cooling water from each drainage path 38 of a case bottom part.
[0101]
As shown in FIG. 8, six IPM cooling water channels 33 are installed in the inverter upper case 30, and cooling water is supplied from a lower case water supply channel 52 of an inverter lower case 59 installed on the lower side of the inverter upper case 30. The water is distributed and distributed in parallel. A water supply port 39 communicating with the lower case water supply channel 52 and the water supply channel 37 of each IPM cooling water channel 33 is an orifice port having an inner diameter defined, and the amount of cooling water is measured and distributed in parallel. In FIG. 8, reference numeral 40 denotes a drain outlet communicating with the lower case drain channel 53 and the drain channel 38 of each IPM cooling channel 33.
[0102]
At the corner of the portion where the case outer wall portion 30a and the vertical wall portion 30b holding the IPM cooling water channel 33 and the outer wall of the inverter upper case 30 intersect, as shown in FIG. 22, the surface of the IPM cooling surfaces 30e and 30f is processed. The hollow portions 30g and 30h (relief) are provided in a cast shape so that the remaining fillet due to the tool radius is eliminated.
[0103]
As shown in FIG. 21, the IPM cooling water channel 33 has a shape that rises vertically from the bottom surface of the inverter upper case 30 and is parallel to the water channel from the bottom surface side to the middle height on the IPM cooling surfaces 30e, 30f to which the IPM 70 is attached. Two protruding ribs 33a and 33b are provided, and the partition plate 36 is fixed to a rib groove 33c sandwiched between the two protruding ribs 33a and 33b.
[0104]
As shown in FIG. 23, the partition plate 36 is provided with a front end bending portion 36a obtained by bending the front end portion of the partition plate 36 in one direction, and is provided on the side of the inverter upper case 30 that is in contact with the convex ribs 33a and 33b. The hook-shaped protrusion 36b and the T-shaped overhang 36c on the opposite side of the hook-shaped protrusion 36b are provided, and the partition plate 36 can be easily fixed to the IPM cooling water channel 33 simply by inserting it into the rib groove 33c. I am doing so.
[0105]
Next, the operation will be described.
[0106]
For example, when reducing the installation volume of heat generating parts by arranging the heat generating parts in three dimensions with the cooling surface as a plurality of vertical surfaces, in the structure where water is supplied and drained from the bottom to the cooling water channel in the vertical direction, the cooling water reaches the upper part of the water channel. It is difficult to obtain the convection of this, and sufficient cooling effect cannot be expected.
[0107]
On the other hand, in the first embodiment, a vertical IPM cooling structure in which cooling water can be convected up to the upper portion by the partition plate 36 is used, so that the IPM 70 that is a heat generating component has a cooling surface as a plurality of vertical surfaces. A sufficient IPM cooling effect can be achieved while arranging in three dimensions.
[0108]
That is, the cooling water supplied from the external cooling water channel to the lower case water supply channel 52 via the water supply pipe 54 of the inverter lower case 30 is distributed from the lower case water supply channel 52 to each water supply port 39, and from each water supply port 39 to the inverter upper By passing through each water supply passage 37 of the case 30 and rising one passage of the IPM cooling water passage 33 formed in an inverted U shape by the partition plate 36, and lowering the other passage through the upper gap, The convection is surely made to the upper part of the water channel, and the IPM 70 which is a heat generating component is cooled. Then, each drainage channel 38 of the inverter upper case 30 passes, gathers from each drainage port 40 to the lower case drainage channel 53 of the inverter lower case 50, passes through the water distribution pipe 55 from the lower case drainage channel 53, and again becomes an external cooling channel To reflux.
[0109]
Accordingly, the IPM 70 that is a heat generating component can be vertically arranged, and the number of the IPM 70 that is a heat generating component can be increased without increasing the bottom areas of the inverter upper case 30 and the inverter lower case 50.
[0110]
In addition, at the intersections between the IPM cooling surfaces 30e and 30f of the inverter upper case 30 and the case outer wall, the hollow portions 30g and 30h (relief) are set in a cast shape, so that the component integration rate can be increased.
[0111]
In addition, since there is no joint surface (mating surface) between the parts constituting the IPM cooling water channel 33 in the inverter upper case 30, it is possible to prevent a short circuit accident caused by the contact of the cooling water with the high voltage portion, in addition to cooling Since the number of parts in the entire water channel is small and easy to assemble, production costs can be reduced.
[0112]
Next, the effect will be described.
As described above, the effects listed below can be obtained in the IPM cooling structure of the first embodiment.
[0113]
(1) The IPM cooling structure does not provide a mechanical joint in the inverter upper case 30 and the inverter lower case 50 of the inverter device I, and allows water to pass vertically, up to the upper part of the vertical IPM cooling water channel 33. Since the cooling water can be convected, a plurality of IPM cooling surfaces 30e and 30f can be installed, and since the IPM cooling surfaces 30e and 30f are vertical, the IPM 70 serving as a heating element can be arranged vertically. The component integration rate is increased, and the cooling area can be expanded without increasing the area of the bottom of the inverter upper case 30. As a result, the number of IPMs 70 can be increased without impairing the mountability on the vehicle. In addition, since the space for storing the high-power components that dislikes the water and the IPM cooling water channel 33 for circulating the cooling water are completely separated by the casting, the contact of the cooling water with the high-power components can be prevented.
[0114]
(2) Since the partition plate 36 is installed inside the IPM cooling water channel 33 having a casting shape, it is cooled to the upper part of the vertical IPM cooling water channel 33 with a simple configuration of a combination of the IPM cooling water channel 33 and the partition plate 36. Water can be convected.
[0115]
(3) Since the IPM cooling water passages 33 are individually divided with respect to the IPM 70 which is a heat generating component and the IPM cooling water passages 33 have a parallel circuit configuration in which the amount of cooling water is distributed according to the required cooling performance, 6 The individual IPMs 70 can be evenly cooled without variation.
[0116]
(4) Since the water supply port 39 of the inverter lower case 50 is set as an orifice port for measuring the amount of cooling water according to the cooling performance required for each IPM cooling water channel 33, it is efficiently suitable for the six IPMs 70 to be distributed. Cooling performance can be secured.
[0117]
(5) Since the cutout portions 30g and 30h (relief) are set in the casting shape at the intersections of the IPM cooling surfaces 30e and 30f of the inverter upper case 30 and the outer wall of the case, the surface processing of the IPM cooling surfaces 30e and 30f is performed. As a result, the IPM 70 can be arranged close to the outer wall of the case, the dead space caused by the corner R of the casting can be eliminated, and the component integration rate can be increased.
[0118]
(6) Since the IPM cooling water channel 33 has a structure in which the rib groove 33c is formed in a casting shape, it is possible to fix the partition plate 36 installed therein without requiring any particular processing, and the rib groove 33c can be used as a heating element. Since it forms on the IPM cooling surfaces 30e and 30f side, the contact area with the cooling water is widened, and the cooling efficiency can be increased.
[0119]
(7) The hook-like protrusions 36b and the tip bent portions 36a of the partition plate 36 provided in accordance with the casting shape are fitted by simply inserting due to the spring property of the material of the partition plate 36, and the IPM cooling water channel 33 Since it has a structure that prevents the gap between the upper part of the water channel from being excessively inserted due to the draft angle generated by molding in the casting shape and the shape of the wedge-shaped partition plate 36, screws, caulking, welding, The partition plate 36 can be fixed so as to leave a gap in the upper portion of the IPM cooling water channel 33 without performing a fastening measure such as adhesion.
[0120]
[Switching room structure]
First, the configuration will be described.
[0121]
As shown in FIG. 24 and FIG. 25, the switching room structure of the first embodiment separates the high-voltage circuit IPM 70 and the low-voltage circuit IPM drive circuit board 82 from each other and puts a shield shield therebetween. Arranged at a distance. And the iron plate used as the magnetic shielding shield is an opening of the base member 83 leaving a gap through which the frame-shaped base member 83 shown in FIG. 26A and the control line 84 shown in FIG. And an IPM driving substrate 82 is installed on the cover member 85.
[0122]
In the base member 83, as shown in FIG. 26A, the opening 83a forms a hemming portion 83b that is hemmed so as not to damage the control line 84 even if it contacts the control line 84. Further, in order to maintain the rigidity of the base member 83, a bent portion 83c is formed by bending both ends of the inverter upper case 30 in the direction across the IPM cooling surfaces 30e and 30f substantially vertically.
[0123]
As shown in FIG. 26B, the cover member 85 forms a hemming portion 85a in which a side portion that forms a hole through which the control line 84 passes when the cover member 85 is combined with the base member 83. The control line 84 is not damaged even if it comes into contact.
[0124]
Next, the operation will be described.
[0125]
In the switching room structure, the IPM 70 and the first DC bus bars 72a and 72b, the second DC bus bars 73a and 73b, the AC bus bar 76, the electrolytic capacitor 74, and the like are incorporated in the inverter upper case 30 and connected to the IPM drive circuit board 82 in the IPM 70. After the control line 84 is attached, the base member 83 is fixed to the upper surface position of the case outer wall portion 30a and the vertical wall portion 30b of the inverter upper case 30, and the cover member 85 integrally having the IPM drive circuit board 82 is a cover member. The control lines 84 are fixed to the base member 83 so that the control lines 84 are arranged in the notch-shaped portions of 85, and finally assembled in the order of connecting the control lines 84 to the IPM drive circuit board 82.
[0126]
For example, when the IPM 70 that is a high voltage circuit and the IPM drive circuit board 82 that is a low voltage circuit are arranged at a close distance, if the peak current of the IPM 70 increases, a surge voltage is likely to occur due to a voltage change. Is leaked to an external circuit, noise is applied to the IPM drive circuit board 82, which is a low-voltage circuit in the inverter device I, and the on-board electronic device, resulting in malfunction.
[0127]
In contrast, the switching room structure of the first embodiment electromagnetically isolates the IPM 70, which is a source of noise, from the IPM drive circuit board 82 and other electronic devices that may malfunction due to noise. Therefore, the IPM drive circuit board 82 and the in-vehicle electronic device can achieve both stable operation, increase in peak current in the IPM 70, and high speed switching.
[0128]
In addition, the high voltage circuit IPM 70 and the low voltage circuit IPM drive circuit board 82 are separated from each other and placed at a close distance with a magnetic shielding shield interposed therebetween. The component integration rate with the IPM drive circuit board 82 that is easy to perform increases, and the inverter device I can be downsized.
[0129]
In addition, since the control line 84 between the IPM 70 and the IPM drive circuit board 82 can be shortened, the influence of noise on the control line 84 can be reduced. In addition, since the plate around the control line 84 is laminated by the hemming process, the shielding property of noise is improved. In addition, in the state where the base member 83 and the cover member 85 overlap, the hole portion through which the control line 84 passes is hemmed all around, so that the control line 84 is caused by vibration caused by engine rotation or vehicle running. Even if the shield parts (base member 83 and cover member 85) are contacted, the control line 84 is not damaged.
[0130]
Next, the effect will be described.
As described above, in the switching room structure of the first embodiment, the effects listed below can be obtained.
[0131]
(1) The high voltage circuit IPM 70 and the low voltage circuit IPM drive circuit board 82 are separated from each other and placed at a short distance with a magnetic shielding shield interposed therebetween, so that the IPM drive circuit board 82 and on-vehicle electronic devices are stable. Both the operation and the increase in peak current and the switching speed in the IPM 70 can be achieved. In addition, the component integration rate increases, and the inverter device I can be downsized. Further, since the distance of the control line 84 exposed to the high voltage circuit between the IPM 70 and the IPM drive circuit board 82 can be shortened, the influence of noise on the control line 84 can be reduced.
[0132]
(2) By hemming, the plate around the control line 84 is laminated with a shield plate, and when the base member 83 and the cover member 85 overlap, the hole portion through which the control line 84 passes is hemmed all around. Therefore, the noise shielding performance is improved, and the control line 84 is not damaged by vibrations caused by engine rotation or vehicle travel.
[0133]
(3) Since the cover member 85, which is a shield component, also serves as a bracket for fixing the IPM drive circuit board 82, the structure in which the IPM 70 and the IPM drive circuit board 82 are arranged at a close distance while blocking noise is small. This can be realized with the number of parts, which can contribute to cost reduction.
[0134]
The power module cooling structure of the present invention has been described based on the first embodiment. However, the specific configuration is not limited to the first embodiment, and the claims relate to each claim. Design changes and additions are allowed without departing from the scope of the invention.
[0135]
For example, in the first embodiment, an example of an inverter device applied to a three-layer multi-axis multi-layer motor with two rotors and one stator as a motor has been shown. However, two independent synchronous motors with one rotor and one stator are used. It can also be applied as a motor inverter device.
[Brief description of the drawings]
FIG. 1 is an overall view of a parallel hybrid system to which an inverter device I according to a first embodiment is applied.
FIG. 2 is a diagram showing an example of a six-phase alternating current by a composite current converted by the inverter device I of the first embodiment.
FIG. 3 is a longitudinal side view showing a multi-axis multilayer motor M of a hybrid system to which the inverter device I of the first embodiment is applied.
FIG. 4 is a view of a coil feeding structure from the inverter device I of the first embodiment to the stator S of the multi-shaft multilayer motor M as viewed from the gear chamber side.
FIG. 5 is an overall plan view of the inverter device I according to the first embodiment.
6 is an overall cross-sectional view of the inverter device I taken along line AA of FIG. 5 of the first embodiment.
7 is an overall cross-sectional view of the inverter device I taken along line BB in FIG. 5 of the first embodiment.
FIG. 8 is a bottom view showing an inverter lower case of the inverter device I according to the first embodiment;
FIG. 9 is a diagram showing a surge voltage characteristic when the inverter device I of the first embodiment is turned off.
FIG. 10 (a) is a diagram showing an equivalent circuit of the IPM power supply side structure of the first embodiment, and FIG. 10 (b) is an electrolytic capacitor in comparison with the IPM power supply side structure of the first embodiment. It is a figure which shows the equivalent circuit of the IPM power supply side structure at the time of installing in the position close | similar to a power module.
FIG. 11 (a) is a diagram showing a magnetic flux due to a bus bar current in the IPM power supply side structure of the first embodiment in which two DC bus bars are arranged orthogonally, and FIG. 11 (b) is a diagram showing two DC bus bars. It is a figure which shows the magnetic flux by a bus-bar electric current at the time of arrange | positioning a bus-bar in parallel.
FIG. 12 is a cross-sectional view showing an electrolytic capacitor to which the electrolytic capacitor cooling structure of the first embodiment is applied.
FIG. 13 is a diagram showing an attachment state of an electrolytic capacitor to which the electrolytic capacitor cooling structure of the first embodiment is applied.
FIG. 14 is a cross-sectional view of a principal part showing the smoothing capacitor arrangement structure of the first embodiment.
FIG. 15 is a view showing a film capacitor assembly in the smoothing capacitor arrangement structure of the first embodiment.
FIG. 16 is an impedance characteristic diagram with respect to a switching frequency in the smoothing capacitor arrangement structure of the first embodiment in which an electrolytic capacitor and a film capacitor are used in combination.
FIG. 17 is a plan view showing a power module vertical installation structure according to the first embodiment;
FIG. 18 is a longitudinal sectional view showing a vertically installed structure of a power module according to the first embodiment.
FIG. 19 is a cross-sectional view showing bolt holes in a case outer wall portion and a vertical wall portion of the inverter upper case in the inverter device I of the first embodiment.
FIG. 20 is a cross-sectional view showing the power module cooling structure of the first embodiment.
FIG. 21 is a partially cutaway perspective view showing an IPM cooling water channel in the power module cooling structure of the first embodiment.
FIG. 22 is a plan view showing a lightening portion at a portion that intersects the outer wall of the case in the power module cooling structure according to the first embodiment;
FIG. 23 is a view showing a partition plate in the power module cooling structure according to the first embodiment;
FIG. 24 is a cross-sectional view of a principal part showing the switching room structure of the first embodiment.
FIG. 25 is a plan view showing the switching room structure of the first embodiment.
FIG. 26 is a plan view showing a base member and a cover member employed in the switching room structure of the first embodiment.
[Explanation of symbols]
M Double-axis multilayer motor (rotary electric machine)
17 battery
30 Inverter upper case (casting case)
30a Case outer wall
30b Vertical wall
30e, 30f IPM cooling surface
30g, 30h Meat removal part
33 IPM cooling water channel (power module cooling water channel)
33a, 33b Convex rib
33c Rib groove
36 Partition plate
36a Bend at tip
36b hook-shaped protrusion
36c T-shaped overhang
37 water supply
38 Drainage channel
39 Water inlet
40 Drainage port
50 Inverter lower case (casting case)
52 Lower case water supply channel
53 Lower case drainage channel
70 IPM (Power Module)
70a, 70b DC power supply terminal
70c Cooling surface
72a, 72b first DC bus bar
73a, 73b Second DC bus bar

Claims (6)

In an inverter device that is arranged between a battery that is a DC power source and a rotating electrical machine that is driven by an AC current, and that has a power module by a switching circuit in a casting case,
The power module is arranged in a vertical orientation with the cooling surface facing outward,
Inside the vertical wall surface provided in the casting case, a power module cooling water channel that feeds and drains water from the bottom of the case and passes water in the vertical direction along the vertical wall surface is molded in a casting shape without providing a mechanical joint , A partition plate is inserted into the power module cooling water passage from the bottom of the case into a cooling water rising passage and a cooling water lowering passage, and the passages are communicated with each other at the upper end portion. A power module cooling structure for an inverter device, wherein a letter-shaped cooling water passage is integrally formed . In the power module cooling structure of the inverter device according to claim 1 ,
A plurality of the power modules are provided, and the power module cooling water channels are installed by dividing the power modules individually,
A power module cooling structure for an inverter device, wherein the water supply / drainage configuration from the bottom of the case is a parallel circuit configuration that distributes the amount of cooling water according to the cooling performance required for each power module cooling water channel. In the power module cooling structure of the inverter device according to claim 2 ,
The casting case is constituted by an inverter upper case provided with a power module cooling water channel, and an inverter lower case fixed to the inverter upper case in a watertight state and provided with a water supply / drainage configuration from the bottom of the case,
A power module cooling structure for an inverter device, wherein a water supply port opened in the inverter lower case is set as an orifice port for measuring a cooling water amount in accordance with a cooling performance required for each power module cooling water channel. In the power module cooling structure of the inverter device according to any one of claims 1 to 3 ,
A power module cooling structure for an inverter device, wherein a thinned portion is set in a casting shape at an intersection between the power module cooling surface of the casting case and the outer wall of the case. In the power module cooling structure of the inverter device according to any one of claims 1 to 4 ,
A power module cooling structure for an inverter device, wherein a rib groove parallel to the water channel is provided in a casting shape from the bottom surface side to a height on the way to the cooling surface side to which the power module of the power module cooling water channel is attached. In the power module cooling structure of the inverter device according to claim 5 ,
The partition plate includes a bent end portion, a hook-like protrusion provided on a side in contact with the rib groove, and a T-shaped protruding portion provided on a side opposite to the hook-like protrusion. A power module cooling structure for an inverter device, characterized by having a configuration.

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