JP2013188008A - Power converter and work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power converter advantageous to weight reduction, and capable of responding flexibly to change in the number of power conversion circuits.SOLUTION: The power converter has a plurality of power conversion units arranged in a first direction. Each power conversion unit includes a housing having a first surface intersecting the first direction, and a second surface extending in the first direction from the outer periphery of the first surface, and having a first aperture opening toward the first direction. A power conversion circuit is housed in the housing. The first aperture in the housing of one of adjoining power conversion units is covered with the first surface of the housing of the other power conversion unit.

Description

  The present invention relates to a power conversion device and a work machine equipped with the power conversion device.

  A capacitor and a motor generator are mounted on a hybrid work machine, an electric work machine, or the like. An inverter circuit is used to drive the motor generator. A buck-boost converter circuit is used to control charging / discharging of the battery. Usually, a work machine is equipped with a plurality of motor generators. A plurality of inverter circuits are mounted corresponding to the plurality of motor generators.

  In order for the work machine to be adapted to work in a poor environment with a lot of dust, the inverter circuit and the boost converter circuit are preferably housed in a sealed container.

  For example, each of the inverter circuit and the step-up / step-down converter circuit is stored in a rectangular parallelepiped metal container having an open top. One inverter circuit and a metal container constitute one inverter unit. One buck-boost converter circuit and a metal container constitute one converter unit. A plurality of metal containers are arranged in contact with each other, and the metal containers are fixed to each other with bolts and nuts penetrating the side surfaces.

  The metal containers fixed to each other are accommodated in a metal base having an open top surface. Openings above the plurality of metal containers are closed with a single upper lid. This upper lid is fixed to a metal base.

  By closing the openings of the plurality of converter units and the inverter unit with one upper cover, the space in which each of the step-up / down converter circuit and the inverter circuit is accommodated can be sealed.

International Publication No. 2010/0587768

  When the rectangular parallelepiped metal containers whose tops are open are arranged, the side surfaces of the metal containers contact each other. The spaces in the metal containers adjacent to each other are separated by the two side surfaces. For this reason, it is disadvantageous for the weight reduction of the power converter device containing an inverter and a buck-boost converter.

  The number of motor generators installed varies depending on the work machine. Accordingly, the required number of inverter units is also different. The number of units accommodated in a conventional metal base depends on the shape of the base and the upper lid. For this reason, when the number of mounted motor generators is different, metal bases and upper lids having different shapes must be prepared.

  An object of the present invention is to provide a power conversion device that is advantageous for weight reduction and can flexibly cope with fluctuations in the number of power conversion circuits to be mounted.

According to one aspect of the invention,
A power conversion device having a plurality of power conversion units arranged in a first direction,
Each of the power conversion units is
A first surface that intersects the first direction, and a second surface that extends from an outer periphery of the first surface in the first direction, and is open toward the first direction. A housing having an opening;
A power conversion circuit housed in the housing,
The power conversion device is provided in which the first opening of one casing of the power conversion units adjacent to each other is covered with the first surface of the casing of the other power conversion unit.

  According to the other viewpoint of this invention, the working machine carrying the said power converter device is provided.

  The first opening of one housing covers the first surface of the other housing. For this reason, the partition which divides the space in a housing | casing will be comprised by the 1st surface of one housing | casing, and it is advantageous to weight reduction. Further, by changing the number of power conversion units arranged in the first direction, it is possible to flexibly cope with fluctuations in the number of mounted power conversion circuits.

FIG. 1 is a perspective view of a housing used in the power conversion apparatus according to the first embodiment. FIG. 2 is a cross-sectional view of the power converter according to the first embodiment. 3 is a cross-sectional view taken along one-dot chain line 3-3 in FIG. 4 is a cross-sectional view taken along one-dot chain line 4-4 of FIGS. FIG. 5A is a cross-sectional view of a connection portion of a casing of the power conversion device according to the first embodiment, and FIG. 5B is a cross-sectional view of a connection portion of the casing and the first lid of the power conversion device according to the first embodiment. is there. FIG. 6 is a cross-sectional view of a connection location between the housing and the second lid of the power conversion device according to the first embodiment. FIG. 7 is a cross-sectional view of a power conversion device according to a modification of the first embodiment. FIG. 8 is a schematic plan view of the work machine according to the second embodiment. FIG. 9 is a schematic side view of the work machine according to the second embodiment. FIG. 10 is a block diagram of a work machine according to the second embodiment. FIG. 11 is an equivalent circuit diagram of the buck-boost converter. FIG. 12 is an equivalent circuit diagram of the inverter. FIG. 13 is a block diagram of an inverter and a storage circuit of the work machine according to the third embodiment.

[Example 1]
In FIG. 1, the perspective view of the housing | casing used for the power converter device by Example 1 is shown. In order to facilitate understanding, an xyz Cartesian coordinate system is defined. The housing 20 includes a first surface 21 that intersects the z direction, and a second surface 22 that extends from the outer periphery of the first surface 21 in the positive direction of the z direction. The housing 20 has an opening (first opening) 24 that is open toward the positive direction in the z direction. The outer shape of the opening 24 reflects the outer shape of the first surface 21.

  As an example, the outer shape of the first surface 21 is a rectangle having sides parallel to the x direction and the y direction. The second surface 22 includes a pair of surfaces parallel to the yz surface and a pair of surfaces parallel to the zx surface. When the first surface 21 is considered as the bottom surface, the second surface 22 can be considered as a side surface rising from the outer peripheral line of the bottom surface.

An opening (second opening) 23 is formed on the first surface 21. A plurality of connector holes 25 are formed in the second surface 22. Furthermore, the second surface 22 has an outlet 2 for the cooling medium.
6 is formed.

  In FIG. 2, sectional drawing of the power converter device by Example 1 is shown. FIG. 3 is a cross-sectional view taken along one-dot chain line 3-3 in FIG.

  The power conversion device includes a plurality of power conversion units 30 arranged in the z direction. Each of the power conversion units 30 includes a housing 20 and a power conversion circuit 32. The power conversion circuit 32 is accommodated in the housing 20.

  The plurality of casings 20 are stacked such that each opening 24 faces the positive side in the z direction. The opening 24 of the casing 20 on the negative side in the z direction of the casings 20 adjacent to each other is covered with the first surface 21 of the casing 20 on the positive side in the z direction. The opening 24 of the housing 20 positioned at the positive end in the z direction is covered with a first lid 33. The opening 23 of the housing 20 located at the negative end in the z direction is covered with a second lid 34.

  A seal connector 35 is attached to the connector hole 25 formed in the housing 20. Via the seal connector 35, supply of power to the power conversion unit 30, extraction of power from the power conversion unit 30, and input of a control signal to the power conversion circuit 32 are performed.

  The power conversion circuit 32 includes a switching element 37 and a capacitor 38. For example, two capacitors 38 are accommodated in one power conversion unit 30. The switching element 37 is fixed to the bottom surface 21 via a cooling plate 39. A cooling channel 40 is formed inside the cooling plate 39. Both ends of the cooling channel 40 are continuous with the outflow inlet 26. The switching element 37 can be cooled by circulating the cooling medium through the cooling flow path 40.

  A capacitor 38 is attached to the second surface 22 parallel to the yz plane. Each of the capacitors 38 has a P terminal 38P and an N terminal 38N. The P terminal 38P and the N terminal 38N are located inside the opening 23 in the xy plane. Conductive member 43P passes through opening 23 and electrically connects P terminals 38P of capacitors 38 accommodated in different power conversion units 30. Similarly, the conductive member 43N electrically connects the N terminals 38N of the capacitors 38 accommodated in the different power conversion units 30 through the opening 23. Thereby, the plurality of capacitors 38 are connected in parallel. In the case where sufficient capacitance can be secured only with the capacitors 38 of some of the power conversion units 30, the capacitors 38 may be removed from the remaining power conversion units 30.

  FIG. 4 is a cross-sectional view taken along one-dot chain line 4-4 in FIGS. An insulating sheet 44 is sandwiched between the conductive member 43P and the conductive member 43N formed of a metal plate. The insulating sheet 44 electrically insulates the conductive member 43P and the conductive member 43N. The conductive member 43N faces the capacitor 38, and the conductive member 43P faces away from the capacitor 38. An opening 46N is formed in the conductive member 43N so that the conductive member 43N does not overlap the P terminal 38P in the yz plane. Similarly, an opening 46P is formed in the conductive member 43P so that the conductive member 43P does not overlap the N terminal 38N in the yz plane.

  The connecting member 45P electrically connects the P terminal 38P and the conductive member 43P, and the connecting member 45N electrically connects the N terminal 38N and the conductive member 43N. The connecting member 45P passes through the opening 46N from the P terminal 38P, passes through the insulating sheet 44, and reaches the conductive member 43P. The connecting member 45N passes through the conductive member 43N and the insulating sheet 44 from the N terminal 38N and reaches the opening 46P. The opening 46N and the opening 46P prevent an electrical short circuit between the conductive members 43P and 43N via the connection members 45P and 45N.

  FIG. 5A shows an enlarged cross-sectional view of a connection portion between the casings 20. A step 27 is formed on the end surface of the second surface 22. A step 28 is formed on the outer surface of the first surface 21 along the outer peripheral line. When the step 27 and the step 28 are fitted, the two housings 20 are positioned in the xy in-plane direction.

  At the end of the second surface 22, a ridge 26 projecting inward is formed. A fastener 29 that penetrates the first surface 21 of the positive housing 20 in the z direction and the flange 26 of the negative housing 20 in the z direction fixes the two housings 20 to each other. The O-ring 31 serving as a seal member disposed between the two casings 20 ensures the airtightness at the connection location between the two casings 20. As the sealing member, packing may be used instead of the O-ring.

  FIG. 5B shows an enlarged cross-sectional view of a connection portion between the housing 20 and the first lid 33. A step 50 is formed along the outer peripheral line of the first lid 33. By fitting the step 27 of the housing 20 and the step 50 of the first lid 33, the first lid 50 and the housing 20 are positioned in the xy in-plane direction. The first lid 33 is fixed to the housing 20 by a fastener 29 that passes through the first lid 33 and the flange 26 of the housing 20. The O-ring 31 disposed between the housing 20 and the first lid 33 ensures airtightness at the connection portion between the housing 20 and the first lid 33. As a result, the opening 26 of the housing 20 is sealed with the first lid 33.

  FIG. 6 shows an enlarged cross-sectional view of a connection portion between the housing 20 and the second lid 34. The opening 23 is closed by the second lid 34. The second lid 34 is fixed to the housing 20 by a fastener 52 that passes through the second lid 34 and the first surface 21 of the housing 20. The O-ring 51 disposed between the second lid 34 and the first surface 21 ensures airtightness at the connection location between the two.

  As shown in FIGS. 5A, 5B, and 6, the plurality of housings 20, the first lid 33, and the second lid 34 form a sealed space in the plurality of housings 20. For this reason, the stable operation | movement of the power converter circuit 32 (FIG. 2) is ensured also in the bad environment with much dust.

  In the power conversion device according to the first embodiment, a sealed space is secured by the casing 20 (FIG. 2) of each power conversion unit 30. For this reason, it is not necessary to prepare a dedicated housing for isolating the power conversion circuit 32 (FIG. 2) from the environment such as dust.

  The only partition wall that separates the internal spaces of the housings 20 adjacent to each other is the first surface 21 of one housing 20. For this reason, weight reduction can be achieved compared with the power converter device in which a partition part has a double structure.

  The number of stacked power conversion units 30 can be changed as necessary. For example, as shown in FIG. 7, for example, five power conversion units 30 can be stacked. Even when five power conversion units 30 are stacked, a sealed space can be formed by the housing 20, the first lid 33, and the second lid 34. As described above, the power conversion device according to the first embodiment can flexibly cope with fluctuations in the number of power conversion circuits 32 (FIG. 2) without increasing the types of components.

  In the first embodiment, a sealed space is formed in the housing 20, but it is not always necessary to guarantee airtightness in a strict sense. A state in which air can be circulated inside and outside the housing 20 may be used.

[Example 2]
With reference to FIGS. 8-12, the working machine by Example 2 is demonstrated. In the second embodiment, a hybrid excavator is exemplified as a work machine on which the power conversion device of the first embodiment is mounted.

  FIG. 8 is a schematic plan view of a hybrid excavator according to the second embodiment. A lower traveling body (traveling device) 71 is attached to the upper revolving body 70 via a turning bearing 73. An engine 74, a main pump 75, a turning electric motor 76, an oil tank 77, a cooling fan 78, a seat 79, a power storage module 80, a motor generator 83, and a power converter 84 are mounted on the upper turning body 70. As the power conversion device 84, the power conversion device according to the first embodiment is used. The engine 74 generates power by burning fuel. The engine 74, the main pump 75, and the motor generator 83 transmit and receive torque to and from each other via the torque transmission mechanism 81. The main pump 75 supplies pressure oil to a hydraulic cylinder such as the boom 82.

  The motor generator 83 is driven by the power of the engine 74 to generate power (power generation operation). The generated power is supplied to the power storage module 80 via the power converter 84, and the power storage module 80 is charged. The motor generator 83 is driven by electric power supplied from the power storage module 80 via the power conversion device 84, and generates power for assisting the engine 74 (assist operation). The oil tank 77 stores oil of the hydraulic circuit. The cooling fan 78 suppresses an increase in the oil temperature of the hydraulic circuit. The operator sits on the seat 79 and operates the hybrid excavator.

  The turning electric motor 76 is driven by the electric power supplied from the power storage module 80 via the power converter 84. In addition, the turning electric motor 76 generates regenerative electric power by converting kinetic energy into electric energy. The generated regenerative power is supplied to the power storage module 80 via the power converter 84. Thereby, the electrical storage module 80 is charged.

  In FIG. 9, the side view of the hybrid type shovel by Example 2 is shown. An upper swing body 70 is mounted on the lower traveling body 71 via a swing bearing 73. The turning electric motor 76 (FIG. 8) turns the upper turning body 70 to be driven to turn the lower traveling body 71 clockwise or counterclockwise. A boom 82 is attached to the upper swing body 70. The boom 82 swings up and down with respect to the upper swing body 70 by a hydraulically driven boom cylinder 107. An arm 85 is attached to the tip of the boom 82. The arm 85 swings in the front-rear direction with respect to the boom 82 by an arm cylinder 108 that is hydraulically driven. A bucket 86 is attached to the tip of the arm 85. The bucket 86 swings with respect to the arm 85 by a hydraulically driven bucket cylinder 109. The power storage module 80 and the power conversion device 84 are mounted on the upper swing body 70.

  FIG. 10 is a block diagram of a hybrid excavator according to the second embodiment. In FIG. 10, the mechanical power system is represented by a double line, the high-pressure hydraulic line is represented by a thick solid line, the electric system is represented by a thin solid line, and the pilot line is represented by a broken line.

  The drive shaft of the engine 74 is connected to the input shaft of the torque transmission mechanism 81. As the engine 74, an engine that generates a driving force by a fuel other than electricity, for example, an internal combustion engine such as a diesel engine is used. The engine 74 is always driven during operation of the work machine.

  The drive shaft of the motor generator 83 is connected to the other input shaft of the torque transmission mechanism 81. The motor generator 83 can perform both the electric (assist) operation and the power generation operation. As the motor generator 83, for example, an internal magnet embedded (IPM) motor in which magnets are embedded in the rotor is used.

The torque transmission mechanism 81 has two input shafts and one output shaft. The output shaft is connected to the drive shaft of the main pump 75.

  When the load applied to the engine 74 is large, the motor generator 83 performs an assist operation, and the driving force of the motor generator 83 is transmitted to the main pump 75 via the torque transmission mechanism 81. Thereby, the load applied to the engine 74 is reduced. On the other hand, when the load applied to the engine 74 is small, the driving force of the engine 74 is transmitted to the motor generator 83 via the torque transmission mechanism 81, so that the motor generator 83 is in a power generation operation. Switching between the assist operation and the power generation operation of the motor generator 83 is performed by an inverter 118 connected to the motor generator 83. The inverter 118 is controlled by the control device 130.

  The control device 130 includes a central processing unit (CPU) 130A and an internal memory 130B. The CPU 130A executes a drive control program stored in the internal memory 130B. The control device 130 alerts the driver by displaying the deterioration state of various devices on the display device 135.

  The main pump 75 supplies hydraulic pressure to the control valve 117 via the high pressure hydraulic line 116. The control valve 117 distributes hydraulic pressure to the hydraulic motors 101A and 101B, the boom cylinder 107, the arm cylinder 108, and the bucket cylinder 109 in accordance with a command from the driver. The hydraulic motors 101A and 101B drive the left and right crawlers provided in the lower traveling body 71 shown in FIGS. 8 and 9, respectively.

  An input / output terminal of the electric system of the motor generator 83 is connected to the storage circuit 190 via the inverter 118. The inverter 118 performs operation control of the motor generator 83 based on a command from the control device 130. Further, a turning electric motor 76 is connected to the storage circuit 190 via another inverter 120. The power storage circuit 190 and the inverter 120 are controlled by the control device 130.

  During the period in which the motor generator 83 is assisted, necessary electric power is supplied from the power storage circuit 190 to the motor generator 83 through the inverter 118. During the period in which the motor generator 83 is generating, the power generated by the motor generator 83 is supplied to the power storage circuit 190 through the inverter 118.

  The electric motor 76 for turning is AC driven by the inverter 120 and can perform both the power running operation and the regenerative operation. For example, an IPM motor is used as the electric motor 76 for turning. An IPM motor generates a large induced electromotive force during regeneration.

  During the power running operation of the turning electric motor 76, the turning electric motor 76 turns the upper turning body 70 (FIGS. 8 and 9) via the speed reducer 124. At this time, the speed reducer 124 decreases the rotation speed. As a result, the rotational force (torque) generated by the turning electric motor 76 increases. Further, during the regenerative operation, the rotational motion of the upper swing body 70 is transmitted to the swing electric motor 76 via the speed reducer 124, whereby the swing electric motor 76 generates regenerative power. At this time, the speed reducer 124 increases the rotation speed, contrary to the power running operation. Thereby, the rotation speed of the electric motor 76 for rotation can be raised.

  The resolver 122 detects the position of the rotating shaft of the turning electric motor 76 in the rotating direction. The detection result is input to the control device 130. By detecting the position of the rotating shaft in the rotational direction before and after operation of the electric motor 76 for turning, the turning angle and the turning direction are derived.

A mechanical brake 123 is connected to the rotating shaft of the turning electric motor 76 and generates a mechanical braking force. The braking state and the release state of the mechanical brake 123 are switched by an electromagnetic switch under the control of the control device 130.

  The pilot pump 115 generates a pilot pressure necessary for the hydraulic operation system. The generated pilot pressure is supplied to the operating device 126 via the pilot line 125. The operation device 126 includes a lever and a pedal and is operated by a driver. The operating device 126 converts the primary side hydraulic pressure supplied from the pilot line 125 into a secondary side hydraulic pressure in accordance with the operation of the driver. The secondary hydraulic pressure is transmitted to the control valve 117 via the hydraulic line 127 and to the pressure sensor 129 via the other hydraulic line 128.

  The detection result of the pressure detected by the pressure sensor 129 is input to the control device 130. Thereby, the control apparatus 130 can detect the operation state of the lower traveling body 71, the electric motor 76 for turning, the boom 82, the arm 85, and the bucket 86 (FIG. 9).

  FIG. 11 shows an equivalent circuit diagram of the power storage circuit 190. A series circuit of a boosting insulated gate bipolar transistor (IGBT) 202A and a step-down IGBT 202B is connected between the pair of bus lines 191. The emitter of the step-up IGBT 202A is connected to the ground-side bus line 191 and the collector of the step-down IGBT 202B is connected to the high-pressure side bus line 191. An interconnection point between the step-up IGBT 202A and the step-down IGBT 202B is connected to the high-voltage side terminal of the power storage module 80 via the reactor 201. The low-voltage side terminal of the power storage module 80 is connected to the ground-side bus line 191.

  Diodes 202a and 202b are respectively connected in parallel to the step-up IGBT 202A and the step-down IGBT 202B such that the direction from the emitter to the collector is the forward direction.

  A capacitor 38 is connected between the bus line 191 on the high voltage side and the ground side. The voltage generated on the bus line 191 is measured by the voltmeter 211. A voltmeter 206 connected in parallel to the power storage module 80 measures the voltage across the terminals of the power storage module 80. An ammeter 207 inserted in series with the reactor 201 measures the charge / discharge current of the power storage module 80. The measurement results of voltage and current are input to the control device 130.

  The control device 130 applies a control pulse width modulation (PWM) voltage to the gate electrodes of the step-up IGBT 202A and the step-down IGBT 202B.

  Hereinafter, the boosting operation (discharging operation) will be described. A PWM voltage is applied to the gate electrode of the boosting IGBT 202A. When the boosting IGBT 202A is turned off, an induced electromotive force is generated in the reactor 201 in a direction in which a current flows from the high-voltage power supply connection terminal 203A toward the collector of the boosting IGBT 202A. This electromotive force is applied to the DC bus line 210 via the diode 202b. As a result, the bus line 191 is boosted.

  Next, the step-down operation (charging operation) will be described. A PWM voltage is applied to the gate electrode of the step-down IGBT 202B. When the step-down IGBT 202B is turned off, an induced electromotive force is generated in the reactor 201 in a direction in which a current flows from the emitter of the step-down IGBT 202B toward the power storage module 80. The storage module 80 is charged by the induced electromotive force.

  FIG. 12 shows an equivalent circuit diagram of the inverter 118. The equivalent circuit of the inverter 120 (FIG. 10) is the same as the equivalent circuit of the inverter 118.

A U-phase IGBT series circuit 192U, a V-phase IGBT series circuit 192V, and a W-phase IGBT series circuit 192W are inserted in parallel between the pair of bus lines 191. Each of these IGBT series circuits includes two IGBTs connected in series, and a diode inserted in parallel with each of the IGBTs. The interconnection points of the two IGBTs are connected to the U-phase, V-phase, and W-phase terminals of the motor generator 83, respectively. A control signal subjected to PWM modulation is applied from the control device 130 to the gate electrode of each IGBT.

  In the second embodiment, the power conversion device according to the first embodiment is used for the power conversion device 84 (FIGS. 8 and 9). For this reason, the space in which the inverter and the buck-boost converter are accommodated can be sealed without increasing the types of components of the power converter 84.

[Example 3]
FIG. 13 is a block diagram of a power storage circuit and an inverter of the work machine according to the third embodiment. Hereinafter, differences from the power storage circuit and the inverter according to the second embodiment illustrated in FIG. 10 will be described, and description of the same configuration will be omitted. The configurations of the inverters 118 and 120, the storage circuit 190, the motor generator 83, and the turning electric motor 76 are the same as those in the first embodiment.

  In the third embodiment, an inverter 195 is further connected to the bus line 191 (FIG. 11) of the power storage circuit 190. The inverter 195 controls the boom regeneration generator 197. A boom hydraulic motor 196 is connected to the boom cylinder 107. The boom hydraulic motor 196 drives the rotating shaft of the boom regeneration generator 197. When the boom 82 (FIG. 9) descends due to the action of gravity, the boom regenerative generator 197 is driven via the boom hydraulic motor 196 to generate power. The generated power is supplied to the power storage circuit 190 via the inverter 195. Inverter 195 and capacitor 38 (FIG. 11) in power storage circuit 190 are implemented by one power conversion unit 30 (FIG. 2).

  In the second embodiment, a total of three power conversion units 30, that is, inverters 118 and 120 (FIG. 10), and a step-up / down converter 200 are mounted on a work machine. On the other hand, in the third embodiment, four power conversion units 30 are mounted corresponding to the three inverters 118, 120, and 195 and the buck-boost converter 200 in the power storage circuit 190. By using the power conversion unit 30 (FIG. 2) having the structure shown in the first embodiment, it is possible to flexibly cope with fluctuations in the number of power conversion units 30 to be mounted.

  When a plurality of power conversion units 30 are mounted on the work machine, it is not necessary to configure all the power conversion units 30 to form one power conversion device. Some power conversion units 30 may constitute a first power conversion device, and the remaining power conversion units 30 may constitute a second power conversion device. Furthermore, it is good also as a structure which mounts three or more power converter devices. Which power conversion unit 30 is combined into one power conversion device may be determined based on a place where a drive target of the power conversion unit 30 is mounted.

  Although the present invention has been described with reference to the embodiments, the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

20 Housing 21 First surface 22 Second surface 23 Opening (second opening)
24 opening (first opening)
25 Connector hole 26 鍔 27, 28 Step 29 Fastener 30 Power conversion unit 31 O-ring 32 Power conversion circuit 33 First lid 34 Second lid 35 Seal connector 37 Switching element 38 Capacitor 38P P terminal 38N N terminal 39 Cooling plate 40 Cooling channel 43P, 43N Conductive member 44 Insulating sheet 45P, 45N Connection member 46P, 46N Opening 50 Step 70 Upper turning body 71 Lower traveling body (base body)
73 Turning bearing 74 Engine 75 Main pump 76 Turning electric motor 77 Oil tank 78 Cooling fan 79 Seat 80 Power storage module 81 Torque transmission mechanism 82 Boom 83 Motor generator 85 Arm 86 Bucket 101A, 101B Hydraulic motor 107 Boom cylinder 108 Arm cylinder 109 Bucket cylinder 114 Main pump 115 Pilot pump 116 High-pressure hydraulic line 117 Control valve 118 Inverter 119 Capacitor 120 Inverter 122 Resolver 123 Mechanical brake 124 Reducer 125 Pilot line 126 Operating device 127, 128 Hydraulic line 129 Pressure sensor 130 Control device 135 Display device 190 Storage circuit 191 Bus line 192U U-phase IGBT series circuit 192V V-phase IGBT series circuit Road 192W W-phase IGBT series circuit 195 Inverter 196 Boom hydraulic motor 197 Boom regeneration generator 200 Converter 201 Reactor 202A Boost IGBT
202B IGBT for step-down
202a, 202b Diode 206 Voltmeter 207 Ammeter 211 Voltmeter

Claims (7)

A power conversion device having a plurality of power conversion units arranged in a first direction,
Each of the power conversion units is
A first surface that intersects the first direction, and a second surface that extends from an outer periphery of the first surface in the first direction, and is open toward the first direction. A housing having an opening;
A power conversion circuit housed in the housing,
The power conversion device in which the first opening of one casing of the power conversion units adjacent to each other is covered with the first surface of the casing of the other power conversion unit. A second opening is provided in the first surface;
The power conversion device according to claim 1, further comprising a conductive member that passes through the second opening and electrically connects the power conversion circuits.   Furthermore, the power converter device of Claim 1 or 2 which has a 1st cover which covers the said 1st opening part of the said power conversion unit located in the end of the said 1st direction.   The power converter according to claim 3 with which said 1st opening of said power conversion unit located in the end of said 1st direction is sealed with said 1st lid.   The power conversion device according to claim 2, further comprising a second lid that covers the second opening of the casing of the power conversion unit located at an end opposite to the first lid.   Furthermore, each of the said power conversion unit is a power converter device of any one of Claims 1 thru | or 5 which has a cooling flow path comprised so that the said power converter circuit might be cooled. An electric motor,
A power storage module that generates DC power;
A power converter for converting the DC power generated from the power storage module into AC power and supplying AC power to the AC motor;
The power conversion device includes a plurality of power conversion units arranged in a first direction,
Each of the power conversion units is
A housing including a first surface intersecting the first direction and a second surface extending from an outer periphery of the first surface in the first direction, the housing being open toward the first direction; ,
A power conversion circuit housed in the housing,
The opened first opening of one casing of the power conversion units adjacent to each other is covered with the first surface of the casing of the other power conversion unit,
A work machine in which one of the power conversion units supplies power to the electric motor.

Images