JP2007259596A - Inverter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inverter in which use of a switching element, having a large current capacity or an electronic component of high heat resistance can be suppressed by dissipating heat generated from a busbar efficiently transmitting converted AC power. <P>SOLUTION: A motor controller 1 comprises a three-phase inverter 10 and a control circuit 11 and housed in a case 12. Terminals 10r-10t are inserted into a through hole 120b and connected with busbars 10n-10p transmitting AC power converted by the three-phase inverter 10. Heat dissipating plates 120c and 120d are arranged in the through hole 120b so as to divide the through hole 120b into three. Even if by having a large current made to flow to generate heat from the bus bars 10n-10p and the terminals 10r-10t, heat can be efficiently dissipated by the heat dissipation plates 120c and 120d that are arranged in the through hole 120b. Consequently, the use of IGBTs having a large current capacity or an electronic component of high heat resistance can be suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inverter device that converts electric power supplied from the outside and supplies the electric power to the outside through a plurality of wiring members.

Conventionally, as an inverter device that converts DC power supplied from the outside into AC power and outputs it, there is an inverter disclosed in, for example, Japanese Patent Laid-Open No. 10-225140. This inverter includes a switching module including a plurality of switching elements and a smoothing capacitor, and is accommodated in an inverter case. One end of the bus bar is connected to the load terminal of the switching module that outputs the converted AC power. The other end of the bus bar protrudes outside through a through hole formed in the bottom of the inverter case. For example, wiring from a motor is screwed to the front end portion of the bus bar protruding to the outside, and torque is generated when AC power is supplied from an inverter.
Japanese Patent Laid-Open No. 10-225140

  By the way, in an inverter device that supplies electric power to a motor that generates torque for driving a vehicle, since the output torque of the motor is very large, the electric power to be supplied also increases. Therefore, when the inverter described above is used, a large current flows through the bus bar connected to the load terminal of the switching module. As a result, the bus bar itself generates heat and enters a high temperature state. However, the bus bar only penetrates through the through holes formed in the bottom portion of the inverter case and protrudes to the outside, and it is difficult to dissipate heat effectively. Therefore, it has been necessary to use a switching element having a large current capacity that can cope with the thermal influence accompanying the heat generation of the bus bar. In addition, a control circuit for controlling the switching module may be accommodated in the inverter case. In that case, it was necessary to use electronic components having high heat resistance for the control circuit, and to further increase the area of the wiring board to suppress heat generation.

  The present invention has been made in view of such circumstances, and efficiently dissipates the heat generated by the wiring member that transmits the converted electric power, so that the switching element having a large current capacity and the high heat resistance electronic component are provided. An object of the present invention is to provide an inverter device that can suppress the use of the inverter.

Means for Solving the Problems and Effects of the Invention

  Therefore, as a result of intensive research and trial and error to solve this problem, the present inventor has made a through-hole through which a plurality of wiring members are collectively inserted at a predetermined distance from these wiring members. By arranging the heat sink made of metal so as to divide the metal plate, it was conceived that the heat generated by the bus bar can be efficiently radiated, and the present invention has been completed.

  That is, the inverter device of the present invention includes a plurality of switching elements that convert electric power supplied from the outside by switching, a control circuit that is connected to the plurality of switching elements and controls the plurality of switching elements, and a plurality of switching elements A plurality of plate-like wiring members made of a conductor that is connected to the element and transmits converted power, a plurality of switching elements, a control circuit, and a plurality of wiring members are accommodated, and the plurality of wiring members are collectively In an inverter device including a case made of metal having a wall portion with a through hole for insertion, a heat dissipation made of metal arranged to divide the through hole at a predetermined distance from a plurality of wiring members It has the board, It is characterized by the above-mentioned.

  According to this configuration, it is possible to efficiently dissipate heat generated by the wiring member that transmits the converted electric power, and to suppress the use of a switching element having a large current capacity and a high heat resistance electronic component. The heat radiating plate is made of a metal having better thermal conductivity than air. By disposing the heat sink so as to divide the through hole, the surface area of the metal part can be increased in the vicinity of the wiring member as compared with the case where a plurality of wiring members are inserted through the through hole all at once. . Therefore, the heat generated by the wiring member can be efficiently radiated through the heat radiating plate. Thereby, use of a switching element with a large current capacity or a highly heat-resistant electronic component can be suppressed. Moreover, the intensity | strength around the through-hole of a case can also be increased by arrange | positioning a heat sink so that a through-hole may be divided | segmented. Here, a plurality of heat sinks may be arranged so as to divide the through hole. Thereby, the surface area of a heat sink further increases and the heat generated by the wiring member can be radiated more efficiently. Moreover, the heat sink may be formed integrally with the case. Thereby, it is not necessary to manufacture and assemble the heat sink as a separate part, and the manufacturing cost of the case can be suppressed. Furthermore, it is preferable that a cooling water flow passage through which cooling water for cooling the plurality of switching elements flows is provided, and a part of the cooling water flow passage is disposed adjacent to the wall portion. Thereby, the heat dissipation of the heat sink disposed on the wall portion is improved, and the heat generated by the wiring member can be radiated more efficiently.

  The inverter device of the present invention is mounted on a vehicle, converts direct current power supplied from a battery into alternating current power, and supplies it to a motor that generates driving force for running the vehicle via a plurality of wiring members. It may be a thing. This effectively dissipates the heat generated by the wiring member that transmits the converted AC power, suppresses the use of switching elements with large current capacity and high-heat-resistant electronic components, and is a highly reliable in-vehicle inverter A device can be configured.

  Next, an embodiment is given and this invention is demonstrated in detail. In this embodiment, the inverter device according to the present invention is mounted on a vehicle, converts DC power supplied from a battery into AC power, and supplies it to a three-phase AC motor that generates driving force for running the vehicle. The example applied to the motor control apparatus which performs is shown.

  First, the circuit configuration of the motor control device will be described with reference to FIG. Here, FIG. 1 is a circuit diagram of the motor control device.

  As shown in FIG. 1, the motor control device 1 (inverter device) includes a three-phase inverter 10 and a control circuit 11 and is accommodated in a case 12 described later. A battery 2 made of a secondary battery and a three-phase AC motor 3 having a rotational position detection sensor 3a are connected to the motor control device 1, respectively. Further, current sensors 4 a and 4 b for detecting the V-phase and W-phase currents of the three-phase AC motor 3 are arranged between the motor control device 1 and the three-phase AC motor 3, respectively.

  The three-phase inverter 10 is a circuit that is controlled by the control circuit 11 and converts the DC voltage output from the battery 2 into an AC voltage and supplies it to the three-phase AC motor 3 when the three-phase AC motor 3 is in a power running state. . Conversely, when the three-phase AC motor 3 is in a regenerative state, the AC voltage generated by the three-phase AC motor 3 is converted into a DC voltage to charge the battery 2. The three-phase inverter 10 includes a smoothing capacitor 10a, inverter IGBTs 10b to 10g (switching elements), and flywheel diodes 10h to 10m.

  The smoothing capacitor 10a is an element that smoothes the DC voltage output from the battery 2 when the three-phase AC motor 3 is in a powering state. Conversely, it is also an element for smoothing the DC voltage output from the three-phase inverter 10 when the three-phase AC motor 3 is in the regenerative state. One end of the smoothing capacitor 10 a is connected to the positive terminal of the battery 2, and the other end is connected to the negative terminal of the battery 2.

  The inverter IGBTs 10b to 10g are switching elements for converting a DC voltage into an AC voltage by turning on and off. The inverter IGBTs 10b to 10g are connected in a three-phase bridge. The collectors of the three inverter IGBTs 10b to 10d on the upper side of the three-phase inverter 10 are connected to one end of the smoothing capacitor 10a, and the emitters of the three IGBTs 10e to 10g on the lower side are connected to the other end of the smoothing capacitor 10a. Yes. The connection points of the IGBTs 10b and 10e for the inverter, the connection points of the IGBTs 10c and 10f for the inverter, and the connection points of the IGBTs 10d and 10g for the inverter are the terminals 10r to 10t (wiring members) of the connector 10q through the bus bars 10n to 10p (wiring members). ), And further connected to the three-phase AC motor 3 via the wire harness 5. Here, the bus bars 10n to 10p are plate-like members made of conductors that transmit AC power converted by the inverter IGBTs 10b to 10g. Terminals 10r to 10t of connector 10q are members for supplying AC power transmitted via bus bars 10n to 10p to the outside.

  The flywheel diodes 10h to 10m are elements for converting an AC voltage into a DC voltage by rectification. The anodes of the flywheel diodes 10h to 10m are connected to the emitters of the inverter IGBTs 10b to 10g, and the cathodes are connected to the collectors of the inverter IGBTs 10b to 10g, respectively.

  The control circuit 11 is a circuit that controls the three-phase inverter 10 based on the motor torque command output from the vehicle ECU (not shown), the DC voltage of the battery 2, the rotational position of the three-phase AC motor 3, and the phase current. The control circuit 11 is connected to the vehicle ECU, the positive and negative terminals of the battery 2, the gates of the inverter IGBTs 11a to 11f, the rotational position detection sensor 3a, and the current sensors 4a and 4b, respectively.

  Next, the configuration of the case will be described with reference to FIGS. Here, FIG. 2 is a front view of the case. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 4 is a cross-sectional view taken along arrow BB in FIG. FIG. 5 is a bottom view of the case.

  As shown in FIG. 2, the case 12 is a member for housing the three-phase inverter 10 and the control circuit 11. The case 12 includes a bottomed rectangular cylindrical main body 120 made of, for example, metal, and a plate-like lid 121 made of, for example, metal that covers the opening of the main body 120. A connector 10q having terminals 10r to 10t is disposed on the front wall 120a of the main body 120.

  As shown in FIGS. 3 and 4, the wall portion 120a is formed with a rectangular through hole 120b through which the terminals 10r to 10t of the connector 10q are inserted all together. The terminals 10r to 10t are connected to the bus bars 10n to 10p with the end portions protruding into the main body 120 through the through holes 120b. In addition, heat sinks 120c and 120d are arranged in the through hole 120b so as to divide the through hole 120b into three parts at a predetermined distance from the bus bars 10n to 10p and the terminals 10q to 10s. The heat sinks 120c and 120d are rectangular plate-shaped members having a predetermined area for dissipating heat generated by the bus bars 10n to 10p and the terminals 10r to 10t. The heat sinks 120c and 120d are made of the same metal as the wall 120a and are formed integrally with the wall 120a.

  As shown in FIGS. 4 and 5, a cooling device 122 for cooling the inverter IGBTs 10 b to 10 g in FIG. 1 is disposed on the bottom 120 e of the main body 120. The cooling device 122 includes a cooling water flow passage 122a through which cooling water flows. A part of the cooling water flow passage 122a on the end side is disposed adjacent to the wall 120a.

  Next, a specific operation will be described. In FIG. 1, when an ignition switch (not shown) is turned on, the motor control device 1 starts its operation. When a motor torque command is input from the vehicle ECU, the control circuit 11 controls the three-phase inverter 10 based on the motor torque command, the DC voltage of the battery 2, the rotational position and the phase current of the three-phase AC motor 3. The three-phase inverter 10 is controlled by the control circuit 11 and converts the DC voltage output from the battery 2 into an AC voltage. The converted AC power is supplied to the three-phase AC motor 3 via the bus bars 10n to 10p, the terminals 10r to 10t of the connector 10q, and the wire harness 5. The three-phase AC motor 3 generates torque according to the motor torque command by being supplied with AC power, and causes the vehicle to travel.

  At this time, when the large current flows, the bus bars 10n to 10p and the terminals 10r to 10t generate heat and become a high temperature state. However, as shown in FIGS. 3 and 4, the heat sinks 120c and 120d are disposed in the through holes 120b through which the terminals 10r to 10t are inserted. Further, as shown in FIGS. 4 and 5, a cooling water flow passage 122a of the cooling device 122 is also disposed adjacent to the wall portion 120a where the radiator plates 120c and 120d are disposed. Therefore, the heat generated by the bus bars 10n to 10p and the terminals 10r to 10t can be efficiently radiated.

  Finally, specific effects will be described. According to the motor control device 1 of the present embodiment, the heat generated by the bus bars 10n to 10p and the terminals 10r to 10t of the connector 10q for transmitting the converted AC power is efficiently radiated, and the IGBT having a large current capacity, Use of highly heat-resistant electronic components can be suppressed. The heat sinks 120c and 120d are made of a metal having better thermal conductivity than air. By disposing the two heat sinks 120c and 120d so as to divide the through hole 120a into three, the surface area of the metal portion can be increased in the vicinity of the bus bars 10n to 10p and the terminals 10r to 10t. Therefore, the generated heat can be efficiently radiated through the heat radiating plates 120c and 120d. Thereby, it is not necessary to use an element having a large current capacity as the IGBTs 10b to 10g for the inverter. Further, it is not necessary to use a high heat resistance element as an electronic component constituting the control circuit 11. Further, the strength around the through hole 120b of the case 12 can be increased.

  Further, according to the motor control device 1, by forming the heat radiating plates 120c and 120d integrally with the wall portion 120a, it is not necessary to manufacture and assemble them as separate parts, and the manufacturing cost of the case 12 can be suppressed.

  Furthermore, according to the motor control device 1, by disposing a part of the cooling water flow passage 122a of the cooling device 122 adjacent to the wall portion 120a, it is possible to further improve the heat dissipation of the heat sinks 120c and 120d. .

  In addition, according to the motor control device 1, the heat generated by the bus bars 10n to 10p and the terminals 10r to 10t is efficiently radiated to suppress the use of IGBTs having a large current capacity and highly heat-resistant electronic components, A highly reliable in-vehicle motor control device can be configured.

It is a circuit diagram of the motor control device in the present embodiment. It is a front view of a case. It is AA arrow sectional drawing in FIG. It is a BB arrow sectional view in FIG. It is a bottom view of a case.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Motor control apparatus (inverter apparatus), 10 ... Three-phase inverter, 10a ... Smoothing capacitor, 10b-10g ... Inverter IGBT (switching element), 10h-10m ... Flywheel Diode, 10n to 10p ... bus bar (wiring member), 10q ... connector, 10r to 10t ... terminal (wiring member), 11 ... control circuit, 12 ... case, 120 ... main body Part, 120a ... wall part, 120b ... through hole, 120c, 120d ... heat sink, 120e ... bottom part, 121 ... lid part, 122 ... cooling device, 122a ... cooling Water passage, 2 ... battery, 3 ... three-phase AC motor, 3a ... rotational position detection sensor, 4a, 4b ... current sensor, 5 ... wire harness

Claims (5)

A plurality of switching elements that convert electric power supplied from the outside by switching, a control circuit that is connected to the plurality of switching elements and controls the plurality of switching elements, and is connected to the plurality of switching elements for conversion A plurality of plate-like wiring members made of a conductor for transmitting the generated power, the plurality of switching elements, the control circuit, and the plurality of wiring members are accommodated, and the plurality of wiring members are collectively inserted. In an inverter device including a case made of a metal having a wall portion formed with a through hole for
An inverter device comprising: a heat dissipation plate made of metal disposed so as to divide the through hole at a predetermined distance from the plurality of wiring members.   The inverter device according to claim 1, wherein a plurality of the heat radiating plates are arranged so as to divide the through hole.   The inverter device according to claim 1, wherein the heat radiating plate is formed integrally with the case.   2. A cooling water flow passage through which cooling water for cooling the plurality of switching elements flows, and a part of the cooling water flow passage is disposed adjacent to the wall portion. The inverter apparatus in any one of -3.   DC power supplied from a battery is converted into AC power, and is supplied to an electric motor that generates driving force for running the vehicle via the plurality of wiring members. The inverter apparatus in any one of Claims 1-4.

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