JP2015107030A - Mechatronic drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit temperature rise of heating elements included in a power converter.SOLUTION: A drive device 10 includes: a motor 20 serving as a rotary machine; an inverter 40 which includes a substrate 41 and heating elements 42, 43 mounted on a substrate surface of the substrate 41, is connected with the motor 20, and serves as a power converter; a motor housing 30 which houses the motor 20; and an inverter housing 50 which houses the inverter 40. The motor housing 30 is integrated with the inverter housing 50. A storage part 60 extending in the same direction as the substrate surface is provided at a position of the drive device 10 which is located adjacent to the inverter 40, and a latent heat storage material 61 is stored in the storage part 60.

Description

  The present invention relates to an electromechanical integrated drive device, and more particularly to an electromechanical integrated drive device including a rotating machine and a power converter integrated.

  Conventionally, various electromechanical drive devices in which a control unit is attached to an actuator such as a motor have been proposed (see, for example, Patent Document 1). Patent Document 1 discloses an inverter-integrated motor that is applied to a refrigeration cycle apparatus for a vehicle. In the inverter integrated motor described in Patent Document 1, low-pressure refrigerant gas before being discharged or introduced from the evaporator flows through the inside of the motor housing, thereby cooling the motor housing. The inverter switching element and the capacitor are fixed to the outer peripheral surface of the peripheral wall of the motor housing, and the peripheral wall of the housing functions as a heat sink.

JP 2003-324903 A

  However, depending on the application of the electromechanical integrated drive device, it may not be possible to provide a motor cooling mechanism using a cooling medium. For example, when the electromechanical integrated structure is applied to a starter device for starting an engine, since the starter device is generally attached to the lower part of the vehicle, it is difficult to extend the cooling pipe, and it is not feasible to cool the actuator by the cooling mechanism. In addition, when a motor is driven for a short time as in a starter device, temporary heat generation occurs due to the short-time driving, but a heat sink alone cannot cope with a temperature rise due to the temporary heat generation and heats the semiconductor element. It is considered that it cannot be sufficiently protected from.

  The present invention has been made to solve the above-described problems, and a main object of the present invention is to provide an electromechanical integrated drive device that can suppress a temperature rise of a heating element included in a power converter.

  The present invention employs the following means in order to solve the above problems.

  The present invention includes a rotating machine (20), a power converter (40) having a substrate (41) and a heating element (42, 43) mounted on the substrate surface, connected to the rotating machine, and the rotating An electro-mechanical integrated drive comprising a first housing (30) for housing a machine and a second housing (50, 150) for housing the power converter, wherein the first housing and the second housing are integrated. It relates to the device (10, 100). According to the first aspect of the present invention, a housing part (60) extending in the same direction as the substrate surface is provided at a position adjacent to the power converter, and the latent heat storage material (61) is housed in the housing part. It is characterized by being.

  In the above configuration, in the electromechanical integrated drive device in which the rotating machine and the power converter are integrated, the latent heat storage material is disposed at a position adjacent to the power converter, and the latent heat storage material is phased from the solid phase to the liquid phase. It was set as the structure which cools a power converter using heat storage by the latent heat accompanying a change. According to such a configuration, in a situation where temporary heat generation occurs in the power converter and the rotating machine as the drive device is driven and the temperature of the power converter increases, the temporary heat generation can be stored in the latent heat storage material. As a result, the temperature rise of the heating element can be suppressed. In addition, the heat stored in the latent heat storage material can be radiated to the outside air environment using the first housing and the second housing.

Sectional drawing which shows schematic structure of a drive device. FIG. 2 is an exploded cross-sectional view illustrating a main configuration of a drive device. The figure which shows the relationship between the temperature in a latent heat storage material, and the amount of heat absorption. The figure which shows a drive device in case a latent-heat storage material is solid. The figure explaining the assembly method of a motor housing and an inverter housing. The figure which shows the initial state before using a drive device. Sectional drawing which shows schematic structure of the drive device of 2nd Embodiment. Sectional drawing which shows the drive device of other embodiment. Sectional drawing which shows the drive device of other embodiment. (A) shows the case where the latent heat storage material is solid, and (b) shows the case where the latent heat storage material is liquid.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the present invention is embodied in an inverter-integrated motor in which an inverter is attached to a motor. In particular, it is assumed that the present invention is embodied in a starter device for starting an in-vehicle engine. The configuration of the electromechanical integrated drive device of this embodiment will be described below with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the electromechanically integrated drive device 10 includes a motor 20 as a rotating machine and an inverter 40 as a power converter electrically connected to the motor 20. In the following description, for convenience, the vertical direction of the drive device 10 is defined with reference to FIG. 1 in which the drive device 10 is arranged with the motor 20 down and the inverter 40 up.

  The motor 20 is, for example, a three-phase AC motor, and includes a stator 23 having a stator core 21 and a coil 22, and a rotor 27 having a rotor core 24, a magnet 25, and a shaft 26 as a rotating shaft. The stator 23 and the rotor 27 are accommodated in a motor housing 30.

  The motor housing 30 is a motor housing member that houses the motor 20 in a state of surrounding the motor 20, and is formed of, for example, a high heat conductive material such as aluminum. The motor housing 30 has a cylindrical peripheral wall portion 31 and a joint portion 32 with an inverter housing 50 that is a housing member of the inverter 40, and these are integrally formed. A stator 23 is disposed inside the peripheral wall portion 31, and a rotor 27 is disposed on the radially inner side of the stator 23 so as to be rotatable relative to the stator 23. The rotor 27 is connected to an output shaft (not shown) of the engine, and rotational force is applied to the output shaft of the engine when the rotor 27 is rotationally driven.

  As shown in FIG. 2, the joint portion 32 protrudes upward (in the direction of the inverter 40) from the outer peripheral edge portion of the peripheral wall portion 31, and the pedestal portion 33 having a flat upper surface. Projecting from the upper surface of the shaft 26 and extending in the axial direction of the shaft 26, and these are integrally formed with the peripheral wall 31. The protrusion 34 has, for example, a rectangular cross section, and a plurality of the protrusions 34 are arranged at a predetermined interval. The pedestal 33 is provided with a through hole (not shown), and a coil lead wire (not shown) extending from the coil 22 of the stator 23 extends through the through hole toward the inverter 40.

  The inverter 40 is a power converter that converts DC power into AC power, and includes a circuit board 41 and various electronic components mounted on the circuit board 41. The electronic component includes a heating element such as a switching element 42, a capacitor 43, and a coil. In the present embodiment, these electronic components are connected to the circuit board 41 by bus bars. The inverter 40 is housed in an inverter housing 50 that is a housing member formed of a high heat conductive material such as aluminum.

  As shown in FIGS. 1 and 2, the inverter housing 50 includes a bottom plate portion 51, an outer peripheral plate portion 52 provided upright from the bottom plate portion 51, and an end portion of the outer peripheral plate portion 52 opposite to the bottom plate portion 51. And a lid 53 provided on 51a. In the inverter housing 50, the bottom plate portion 51 and the outer peripheral plate portion 52 are integrally formed, and a lid portion 53 is fixed to an end portion of the outer peripheral plate portion 52 via a sealing member 54 such as an O-ring. Yes. Inverter 40 is arranged in space P <b> 1 surrounded by bottom plate portion 51, outer peripheral plate portion 52, and lid portion 53.

  A coil lead wire extending from the coil 22 of the motor 20 extends inside the space portion P1 as the inverter accommodating portion, and a coil terminal which is a tip portion of the coil lead wire is connected to an output terminal of the switching element 42. Yes. Further, in the space portion P1, the heating elements 42 and 43 mounted on the circuit board 41 have bottom surfaces sandwiching the heat conductive sheet 44 with the surface (top plate surface) opposite to the circuit substrate 41 as a contact surface. It is in contact with the part 51. The thermally conductive sheet 44 is made of a highly thermally conductive insulating material, and is made of, for example, a silicone-based or acrylic-based material. As a result, the heat of the heat generating elements such as the switching element 42 and the capacitor 43 is transmitted to the inverter housing 50 via the heat conductive sheet 44 and further released from the inverter housing 50 to the outside.

  The bottom plate portion 51 is provided with a protrusion 55 that protrudes in the direction toward the motor housing 30 and extends in the axial direction of the shaft 26, and the protrusion 55 is integrally formed with the bottom plate 51. The protrusion 55 has, for example, a rectangular cross section, and a plurality of protrusions 55 are arranged with a predetermined interval. In the present embodiment, the protrusions 55 are provided in substantially the same number as the protrusions 34 provided on the joint 32 of the motor housing 30. In the state where the joint portion 32 and the bottom plate portion 51 of the motor housing 30 are arranged to face each other, the ridge portion 55 of the inverter housing 50 and the ridge portion 34 of the joint portion 32 are alternately arranged. ing.

  As shown in FIGS. 1 and 2, the end 52 b of the outer peripheral plate 52 opposite to the lid 53 protrudes downward from the bottom plate 51. As a result, a recessed portion that is recessed in the direction toward the inverter 40 is formed on the surface of the inverter housing 50 facing the motor housing 30. Further, the end 52 b of the outer peripheral plate 52 is fixed to the joint 32 via the sealing member 56 in a state where the recess formed in the inverter housing 50 is opposed to the joint 32 of the motor housing 30. Yes. Thereby, as shown in FIG. 1, the inverter housing 50 and the motor housing 30 are integrated. In this integrated state, a housing portion 60 extending along the board surface of the circuit board 41 is formed at the boundary portion between the motor housing 30 and the inverter housing 50, and the latent heat storage material is formed in the housing portion 60. 61 is housed.

  The latent heat storage material 61 is a material that can store thermal energy using the phase change of the substance, and stores heat by latent heat accompanying the phase change of the substance from the solid phase to the liquid phase. That is, as shown in FIG. 3, when the latent heat storage material 61 absorbs heat, it changes from a solid phase to a liquid phase in accordance with the amount of heat absorbed. At the time of the change from the solid phase to the liquid phase, the absorbed heat is consumed for the phase change of the substance, so that the heat is absorbed while the temperature of the latent heat storage material 61 is constant at the melting point Tm. That is, the latent heat storage material 61 has a period in which the temperature does not increase until the amount of heat corresponding to the heat of fusion ΔQ has been absorbed.

  Here, in the electromechanical integrated structure in which the motor 20 and the inverter 40 are integrated, the motor 20 and the inverter 40 are both heating elements, and it is assumed that heat generated by the motor 20 is transmitted to the inverter 40. Further, since the heat of the motor 20 is transmitted to the inverter 40, there is a possibility that the temperature is likely to rise in the semiconductor element mounted on the circuit board 41 of the inverter 40. In particular, when the electromechanical integrated structure is applied to the starter device as in the present embodiment, the motor 20 generates more heat in order to increase the output. On the other hand, semiconductor elements are generally vulnerable to heat, and there is a high need for heat protection.

  Therefore, in the present embodiment, as shown in FIG. 1, a housing portion 60 extending in the same direction as the substrate surface of the circuit board 41 of the inverter 40 is provided at a position adjacent to the inverter 40, and the latent heat storage material 61 is provided in the housing portion 60. Is enclosed. Thereby, heat is temporarily stored by the latent heat storage material 61. In particular, in the present embodiment, as shown in FIG. 1, the accommodating portion 60 is arranged at the boundary portion between the motor 20 and the inverter 40. Thereby, while suppressing that the heat which generate | occur | produced in the motor 20 is transmitted to the inverter 40, about the heat which generate | occur | produced in the inverter 40, it is made to transmit to the latent heat storage material 61 from the inverter housing 50, and is temporarily in the latent heat storage material 61. To store. Further, the heat temporarily stored in the latent heat storage material 61 can be dissipated to the outside air environment with the combined surface area of not only the inverter housing 50 but also the motor housing 30, so that the cooling time can be shortened.

  As the latent heat storage material 61, a material whose melting point Tm is higher than the environmental temperature Ta where the motor 20 is used and lower than the use limit temperature Tj of the semiconductor component (for example, the switching element 42) used in the inverter 40 is used. Used. If the melting point Tm of the latent heat storage material 61 is lower than the environmental temperature Ta, the latent heat is taken away only by the environmental temperature Ta, so that it is difficult to obtain an endothermic effect when the inverter 40 generates heat. Further, if the melting point Tm of the latent heat storage material 61 is equal to or higher than the use limit temperature Tj, the latent heat storage material 61 does not melt even when the use limit temperature Tj is reached, so that a sufficient heat absorption effect cannot be obtained, and the inverter 40 is overheated. It is because there is a possibility of inviting. Specifically, a low-temperature solder having a melting point Tm of 80 to 160 ° C. is used as the latent heat storage material 61, and for example, an alloy mainly composed of tin (Sn) and bismuth (Bi) is used.

  In the present embodiment, the protrusions 34 and 55 have the same size and the same number, and thereby the area where the inverter housing 50 contacts the latent heat storage material 61 and the motor housing 30 the latent heat storage material. The area in contact with 61 is substantially the same.

  Next, the phase change of the latent heat storage material 61 when heat is generated in the motor 20 and the inverter 40 and the movement of heat during heat generation will be described with reference to FIG.

  FIG. 4 shows the driving device 10 in which the latent heat storage material 61 is in a solid state. When the latent heat storage material 61 is solid, as shown in FIG. 4, the volume occupied by the latent heat storage material 61 is smaller than the volume of the housing portion 60, and an air layer as the expansion absorbing portion 63 is formed in the housing portion 60. The By forming such an air layer, the volume expansion when the latent heat storage material 61 undergoes a phase change from the solid phase to the liquid phase is absorbed.

  In the present embodiment, a plurality of ridges 55 are provided on the bottom plate portion 51 of the inverter housing 50, and these ridges 55 face the direction of gravity in a state where the motor 20 is placed down and the inverter 40 is placed up. Protruding. Here, when the latent heat storage material 61 is solid, an air layer is formed in the housing portion 60. In the solid state before the latent heat storage material 61 melts, the latent heat storage material 61 is unevenly distributed in the direction of gravity. As shown in FIG. 4, the bottom plate portion 51 of the inverter housing 50 and the latent heat storage material 61 are not in contact with each other. In the driving device 10 of the present embodiment, a plurality of protrusions 55 are provided in the direction toward the motor housing 30 in the bottom plate part 51, so that the protrusions are provided regardless of whether the latent heat storage material 61 is a solid phase or a liquid phase. When at least the tip of 55 contacts the latent heat storage material 61, the inverter housing 50 and the latent heat storage material 61 are kept in contact with each other.

  For example, when cranking is started by the drive device 10 as a starter device in response to a request for starting the engine, heat is generated in the inverter 40 and the motor 20. At this time, the heat generated by the heat generating element such as the switching element 42 is transmitted to the bottom plate portion 51 of the inverter housing 50 through the heat conductive sheet 44 as indicated by an arrow in FIG. It is absorbed by the latent heat storage material 61. Further, the heat generated by the motor 20 is absorbed by the latent heat storage material 61 from the motor housing 30 through the protrusions 34. Thereby, the heat generated in the motor 20 is suppressed from being transmitted to the inverter housing 50.

  When the latent heat storage material 61 changes to a liquid phase due to heat, the volume expansion of the latent heat storage material 61 occurs, but this volume expansion is absorbed by the expansion absorption part 63, and as shown in FIG. The state is filled with the material 61. When energization of the drive device 10 is stopped, heat is radiated from the entire motor housing 30 and the inverter housing 50, and the heat temporarily stored in the latent heat storage material 61 is externally transmitted from the surfaces of the housings 30 and 50. To be released. With such heat radiation, the latent heat storage material 61 returns from the liquid phase to the solid phase again.

  In particular, the drive device 10 as a starter device is used for short-time drive (for example, several seconds per drive), and the motor 20 and the inverter 40 temporarily increase in temperature with the short-time drive. At this time, there is a possibility that the temporary temperature rise cannot be sufficiently mitigated only by heat release to the outside through the motor housing 30 and the inverter housing 50. In addition, the starter device is normally disposed in the engine room and is installed in an environment where heat accumulation is likely to occur. Therefore, the temperature of the heating element is likely to increase due to a temporary temperature increase. In this regard, as shown in FIG. 1, by disposing the latent heat storage material 61 inside the housings 30 and 50, the latent heat storage material 61 is temporarily attached to the latent heat storage material 61 using a period during which the temperature of the latent heat storage material 61 is constant at the melting point Tm. Heat can be stored. Thereby, it is possible to suitably cope with temporary heat generation of the driving device 10.

  As shown in FIG. 2, a coating layer 62 is formed on the inner wall surface of the accommodating portion 60. The coating layer 62 is formed of a material that has higher wettability (affinity) with respect to the latent heat storage material 61 than a material (for example, aluminum) that forms the inverter housing 50 and the motor housing 30. As a material for forming such a coating layer 62, it is preferable that the material having the same or higher thermal conductivity as the material for forming the housings 30 and 50 is further used. For example, a combination in which the latent heat storage material 61 is a low-temperature solder and the coating layer 62 is copper is an example. By providing the coating layer 62 formed of such a material having high wettability, the surface tension when the latent heat storage material 61 becomes a liquid phase can be reduced. Further, by reducing the surface tension, it is possible to suppress an increase in contact thermal resistance between the latent heat storage material 61 and the housings 30 and 50.

  Next, a method for assembling the drive device 10, particularly a method for assembling the motor housing 30 and the inverter housing 50, will be described with reference to FIGS. 5 and 6. In assembling, before integrating the motor housing 30 and the inverter housing 50, first, as shown in FIG. 5, the latent heat storage material 61 is bonded to the surface of the inverter housing 50 facing the motor housing 30. Specifically, a solid phase latent heat storage material 61 is placed in a recessed portion between the ridge portions 55 in the bottom plate portion 51 of the inverter housing 50 and heated and molded, whereby the bottom plate portion 51 and the ridge portion 55 are formed. The latent heat storage material 61 is bonded to the surface. Subsequently, the motor housing 30 and the inverter housing 50 are connected in a state where the latent heat storage material 61 is bonded to the inverter housing 50. Thereby, the latent heat storage material 61 is accommodated in the accommodating part 60. In an initial state before the use of the drive device 10 is started, the latent heat storage material 61 is in a state of sticking to the bottom plate portion 51 and the protrusion portion 55 of the inverter housing 50 as shown in FIG. In FIG. 6, the coating layer 62 is omitted for convenience. By adopting such an assembling method, the latent heat storage material 61 can be sealed in the housing portion 60 by a relatively simple operation.

  According to the embodiment described in detail above, the following excellent effects can be obtained.

  In the drive device 10 that is an inverter-integrated motor, a latent heat storage material 61 is disposed at a position adjacent to the inverter 40, and the latent heat storage material 61 is used to store heat by latent heat accompanying a phase change from a solid phase to a liquid phase. Thus, the inverter 40 is cooled. According to such a configuration, even when temporary heat generation occurs in the inverter 40 and the motor 20 as the drive device 10 is driven, the temporary heat generation can be stored in the latent heat storage material 61. As a result, the heat generation The temperature rise of the elements 42 and 43 can be suppressed. In addition, the heat stored in the latent heat storage material 61 can be radiated using the motor housing 30 and the inverter housing 50.

  In particular, in the present embodiment, the housing portion 60 is provided between the motor 20 and the inverter 40. According to such a configuration, the heat generated in the motor 20 can be suppressed from being transmitted to the inverter 40, and the heat generated in the inverter 40 is transmitted from the inverter housing 50 to the latent heat storage material 61 to thereby store the latent heat. The material 61 can be temporarily stored. Further, the heat temporarily stored in the latent heat storage material 61 can be released with a surface area that includes not only the inverter housing 50 but also the motor housing 30, and the cooling time can be shortened.

  The drive device 10 is assembled by connecting the motor housing 30 and the inverter housing 50 in a state in which a recess is provided in the outer peripheral portion of the inverter housing 50 and the recess is directed to the motor housing 30. According to such a configuration, the accommodating portion 60 for accommodating the latent heat storage material 61 can be provided at the boundary portion between the motor housing 30 and the inverter housing 50. Therefore, a dedicated member for housing the latent heat storage material 61 is not necessary, and the housing portion can be formed with a small number of parts. In addition, a space for accommodating the latent heat storage material 61 can be ensured only by connecting the motor housing 30 and the inverter housing 50.

  In the inverter housing 50, the latent heat storage material 61 is bonded to a portion facing the motor housing 30, more specifically, a side surface portion of the bottom plate portion 51 where the protrusions 55 are provided, and the bonded state By connecting the inverter housing 50 and the motor housing 30, the latent heat storage material 61 is accommodated in the accommodating portion 60. With this configuration, the latent heat storage material can be easily sealed. Moreover, the heat of the inverter housing 50 can be stored first at the start of use of the drive device 10.

  In the inverter housing 50 and the motor housing 30, a plurality of protrusions 34 and 55 are provided on the portion facing the housing portion 60. Thereby, a contact area with the latent heat storage material 61 can be increased, and heat dissipation can be promoted. In addition, by providing a plurality of protrusions 55 in the direction toward the motor housing 30 in the bottom plate part 51, at least the tip part of the protrusions 55 is provided regardless of whether the latent heat storage material 61 is a solid phase or a liquid phase. It can be kept in contact with the latent heat storage material 61. Thereby, the state which the inverter housing 50 and the latent heat storage material 61 contacted can always be hold | maintained.

  Considering that the volume expansion of the latent heat storage material 61 occurs when the latent heat storage material 61 changes from a solid phase to a liquid phase, an expansion absorbing portion 63 that absorbs the volume expansion is provided in the housing portion 60. By setting it as such a structure, the deformation | transformation of the accommodating part 60 by the swelling of the latent heat storage material 61 can be suppressed.

  The coating layer 62 made of a material having higher wettability with respect to the latent heat storage material 61 than the inverter housing 50 is provided on the inner wall surface 64 of the housing portion 60. By setting it as such a structure, the surface tension when the latent heat storage material 61 becomes a liquid phase can be reduced. Further, by reducing the surface tension, an increase in contact thermal resistance between the latent heat storage material 61 and the housings 30 and 50 can be suppressed, and heat absorption by the latent heat storage material 61 can be suitably performed. .

  Heating elements such as the switching element 42 and the capacitor 43 are provided on the opposite side of the latent heat storage material 61 with the inverter housing 50 and the heat conductive sheet 44 interposed therebetween, and are in contact with the inverter housing 50. With this configuration, the heat generated by the heating elements 42 and 43 can be quickly transmitted to the latent heat storage material 61 through the inverter housing 50.

  In particular, the starter device for starting the engine is used for short-time drive of about several seconds, and the motor 20 and the inverter 40 generate heat instantaneously as the short-time drive is performed. The heat generated instantaneously in this manner may cause a delay in heat dissipation to the outside through the housing due to heat radiation resistance or the like, and may not be in time for cooling. Further, the starter device is disposed in the engine room, and is placed in an environment in which a temporary temperature rise easily occurs due to heat accumulation in the room. In consideration of these points, by arranging the latent heat storage material 61 in the housing in the starter device having an electromechanical integrated structure, the latent heat storage material 61 temporarily stores heat by using the heat storage by the latent heat of the latent heat storage material 61. The temporary heat generation of the drive device 10 can be sufficiently dealt with.

(Second Embodiment)
Next, a second embodiment will be described. In the first embodiment, the housing portion 60 that houses the latent heat storage material 61 is provided between the motor 20 and the inverter 40, so that the housing portion 60 is provided at a position adjacent to the inverter 40. On the other hand, in this embodiment, while arrange | positioning the inverter 40 and the motor 20 so that it may mutually adjoin, the accommodating part 60 is provided on the opposite side to the motor 20 on both sides of the inverter 40, and the accommodating part 60 is provided. The configuration is provided at a position adjacent to the inverter 40. Hereinafter, the difference from the first embodiment will be mainly described.

  FIG. 7 is an overall schematic diagram of the driving apparatus 100 of the present embodiment. It is assumed that the driving device 10 of this embodiment is also applied to a starter device for starting an engine.

  In the driving apparatus 100 of FIG. 7, the motor housing 30 has the same configuration as that of the first embodiment except that the protruding portion (the protruding portion 34) is not provided at the joint portion 32. The inverter housing 150 includes a counter plate portion 151 that extends in the same direction as the upper surface of the base portion 33 of the joint portion 32, and an outer peripheral plate portion 152 that surrounds the outer edge portion of the counter plate portion 151. In the outer peripheral plate portion 152, the upper end portion 152 a and the lower end portion 152 b protrude from the opposing plate portion 151, and the lower end portion 152 b is fixed to the pedestal portion 33 of the joint portion 32 via the sealing member 56. Thereby, as shown in FIG. 7, the inverter housing 150 and the motor housing 30 are integrated. In this integrated state, a space portion P1 is formed between the motor housing 30 and the inverter housing 150, and the inverter 40 is disposed in the space portion P1.

  The circuit board 41 of the inverter 40 is disposed in the space P1 with the board surface extending in the same direction as the counter plate portion 151, and the heating elements 42 and 43 are mounted on the board surface of the circuit board 41. Yes. The heat generating elements 42 and 43 are in contact with the opposing plate portion 151 with the insulating heat conductive sheet 44 interposed therebetween.

  A lid portion 153 is attached to an upper end portion 152 a of the outer peripheral plate portion 152 of the inverter housing 150 via a sealing member 54. In addition, a housing portion 60 extending in the same direction as the substrate surface of the circuit board 41 is formed by the space portion surrounded by the counter plate portion 151, the outer peripheral plate portion 152, and the lid portion 153, and the latent heat storage material is formed in the housing portion 60. 61 is housed. In the driving device 100, the latent heat storage material 61 is disposed at a position adjacent to the inverter 40, so that the heat of the heating elements 42 and 43 is temporarily stored in the latent heat storage material 61, and the stored heat is stored in the inverter housing 150. Through the outside. In particular, in the driving apparatus 100 of the present embodiment, the latent heat storage material 61 is in contact with the maximum surface of the lid portion 153, and the entire surface of the lid portion 153 that faces the maximum surface is in contact with the outside. Thereby, the heat stored in the latent heat storage material 61 is released from the entire lid 153 to the outside.

  In addition, also in the drive device 100 of the present embodiment, it is preferable to provide the accommodating portion 60 with an expansion absorbing portion that can absorb volume expansion when the latent heat storage material 61 undergoes a phase change from a solid phase to a liquid phase. By providing the expansion absorbing portion, it is possible to suppress deformation of the member such as the lid portion 153 when the latent heat storage material 61 changes from the solid phase to the liquid phase.

  According to the second embodiment described in detail above, the heat generation of the heating elements 42 and 43 of the inverter 40 and the motor are provided by providing the storage portion 60 in which the latent heat storage material 61 is stored in a position adjacent to the inverter 40. The heat transmitted from 20 to the heating elements 42 and 43 can be temporarily stored. Thereby, in the starter device of an electromechanical integrated structure, the temperature rise of the heat generating elements 42 and 43 can be suppressed, and thermal protection can be suitably achieved.

  The latent heat storage material 61 is in contact with one side surface of the lid portion 153, and the entire surface of the lid portion 153 facing the surface in contact with the latent heat storage material 61 is in contact with the outside. Thereby, the heat stored in the latent heat storage material 61 can be released from the entire lid 153 to the outside air environment, and the latent heat storage material 61 can be quickly cooled.

(Other embodiments)
The present invention is not limited to the description of the above embodiment, and may be implemented as follows, for example.

  In the first embodiment, the area where the inverter housing 50 contacts the latent heat storage material 61 and the area where the motor housing 30 contacts the latent heat storage material 61 are substantially the same. However, in this embodiment, the motor housing 30 Is configured such that the area in which the inverter housing 50 contacts the latent heat storage material 61 is larger than the area in contact with the latent heat storage material 61. There is an upper limit to the amount of heat that can be absorbed by the latent heat storage material 61. When a certain amount of heat is absorbed, the latent heat storage material 61 changes to a liquid phase and the temperature rises again (see FIG. 3). Considering this point, by increasing the contact area of the inverter housing 50 with the latent heat storage material 61, the heat transfer rate from the inverter housing 50 to the latent heat storage material 61 can be further increased. Thereby, the heat transfer from the inverter housing 50 to the latent heat storage material 61 becomes better, and the effect of suppressing the temperature rise of the heating elements 42 and 43 can be enhanced. In addition, when the motor is stopped, the heat stored in the latent heat storage material 61 can be released from both the surfaces of the inverter housing 50 and the motor housing 30.

  As a configuration for further increasing the contact area of the inverter housing 50 with the latent heat storage material 61, for example, as shown in FIG. 8, the number of protrusions 55 provided on the inverter housing 50 is the number of protrusions provided on the motor housing 30. The structure which increases more than the number of the strips 34 is mentioned. Or it is good also as a structure which makes the height or the length of the elongate direction of the protrusion 55 of the inverter housing 50 larger than the protrusion 34 of the motor housing 30. FIG. Further, instead of changing the number and size of the protrusions 55, the inverter housing 50 has a contact area with the latent heat storage material 61 rather than the motor housing 30 due to the difference in the shape of the two opposing surfaces in the housing 60. It may be made larger.

  -In the said 2nd Embodiment, it is good also as a structure which provides a radiation fin in the opposing surface with the accommodating part 60 among the outer peripheral surfaces of the opposing board part 151. FIG. By doing so, the contact area with the latent heat storage material 61 can be increased, and heat absorption by the latent heat storage material 61 can be promoted. Moreover, it is good also as a structure which provides a radiation fin in at least any one of the opposing surface with the accommodating part 60 among the outer peripheral surfaces of the cover part 153 of the inverter housing 150, and the opposing surface with the exterior.

  In the first embodiment, a concave portion is formed on the surface of the inverter housing 50 facing the motor housing 30, and the motor housing 30 and the inverter housing 50 are coupled with the concave portion facing the motor housing 30. Thus, the housing portion 60 is formed between the motor housing 30 and the inverter housing 50, but the method of forming the housing portion 60 is not limited to this. For example, the motor housing 30 and the inverter housing 50 are connected by forming a concave portion on the surface of the motor housing 30 facing the inverter housing 50 (joint portion 32) and with the concave portion facing the inverter housing 50. The housing 60 may be formed between the motor housing 30 and the inverter housing 50. Alternatively, the housing portion 60 may be formed by forming recesses in both the motor housing 30 and the inverter housing 50 and combining the recesses with each other.

  The third housing is provided as a separate member having a housing portion that houses the latent heat storage material 61 instead of the configuration in which the housing portion 60 is provided by using a recess formed in at least one of the motor housing 30 and the inverter housing 50. It is good also as a structure. In this case, the third housing is preferably made of a highly heat conductive material such as aluminum.

  In the first embodiment, the drive device 10 is assembled by bonding the latent heat storage material 61 to the inverter housing 50 and connecting the bonded inverter housing 50 and the motor housing 30. The method of assembling the drive device 10 is not limited to this. For example, the drive device 10 is assembled by bonding the latent heat storage material 61 to the motor housing 30 and connecting the motor housing 30 and the inverter housing 50 in this state. It is good. Alternatively, after the inverter housing 50 and the motor housing 30 are connected, the latent heat storage material 61 is injected from the communication hole with the outside provided in the housing portion 60, and then the communication hole is sealed to perform assembly. Good.

  -In the said 1st Embodiment, while providing the expansion absorption part 63 in the accommodating part 60, while absorbing the volume expansion at the time of the change from the solid phase of the latent heat storage material 61 to a liquid phase, it is in the inner wall surface 64 of the accommodating part 60 By providing the plurality of protrusions 55, the inverter housing 50 and the latent heat storage material 61 are kept in contact with each other. In this embodiment, as shown in FIG. 9, a deformed plate portion 65, which is a plate-like elastic member that partitions the inside of the housing portion 60 into the inverter side and the motor side, is disposed in the housing portion 60 in this embodiment. And the latent heat storage material 61 is accommodated in the inverter side among the two spaces partitioned by the deformable plate portion 65. When the latent heat storage material 61 is solid, as shown in FIG. 9A, the latent heat storage material 61 is unevenly distributed on the inverter side by the deformable plate portion 65, thereby forming a space portion as the expansion absorbing portion 63. ing. When the latent heat storage material 61 stores heat as the motor is driven and changes from the solid phase to the liquid phase, the deformable plate portion 65 bends in the direction toward the motor 20 as shown in FIG. At this time, since the expansion absorption part 63 absorbs the volume expansion of the latent heat storage material 61, the expansion of the accommodating part 60 accompanying a phase change can be suppressed. Moreover, according to such a structure, the latent heat storage material 61 and the inverter housing 50 can be always kept in contact.

  In the first embodiment, the protrusions 34 and 55 are provided on the inner wall portion of the accommodating portion 60. However, the shape of the protrusion is not limited to this, and may be, for example, a needle shape or an arc shape.

  In the first and second embodiments, the motor 20 is arranged such that the direction in which the circuit board 41 of the inverter 40 extends and the axial direction of the shaft 26 of the motor 20 are the same. However, the motor 20 may be arranged so that the board surface of the circuit board 41 of the inverter 40 and the axial direction of the shaft 26 of the motor 20 intersect.

  In the first embodiment and the second embodiment, the drive device applied to the starter device for starting the engine has been described. However, the drive device can be applied not only to the starter device but also to a rotating machine for other purposes. For example, the present invention may be applied to an inverter-integrated electric compressor for a refrigeration cycle in which an electric compressor and an inverter are integrated, or may be applied to an electric power steering device for a vehicle. Alternatively, the present invention may be applied to an electromechanical integrated drive device (for example, an alternator) including an AC generator as a rotating machine and a converter (converter) that converts AC power into DC power as a power converter.

  DESCRIPTION OF SYMBOLS 10,100 ... Drive device (mechanical and electrical integrated drive device), 20 ... Motor (rotary machine), 23 ... Stator, 27 ... Rotor, 30 ... Motor housing (first housing), 32 ... Joint part, 33 ... Base part, 34 ... Projection (projection), 40 ... Inverter (power converter), 41 ... Circuit board, 42 ... Switching element (heating element), 43 ... Capacitor (heating element), 44 ... Thermally conductive sheet, 50, DESCRIPTION OF SYMBOLS 150 ... Inverter housing (2nd housing), 55 ... Projection part (projection part), 60 ... Accommodating part, 61 ... Latent heat storage material, 62 ... Coating layer, 63 ... Expansion absorption part, 64 ... Inner wall surface, 65 ... Deformation Board part.

Claims (12)

A rotating machine (20), a power converter (40) having a substrate (41) and a heating element (42, 43) mounted on the substrate surface and connected to the rotating machine, and the rotating machine are accommodated. An electromechanically integrated drive device (10, 10) comprising a first housing (30) and a second housing (50, 150) for housing the power converter, wherein the first housing and the second housing are integrated. 100),
A housing part (60) extending in the same direction as the substrate surface is provided at a position adjacent to the power converter, and the latent heat storage material (61) is housed in the housing part. Integrated drive device.   The electromechanical integrated drive device according to claim 1, wherein the housing portion is provided between the rotating machine and the power converter. The accommodating portion faces each of the first housing and the second housing;
The electromechanical integrated drive device according to claim 2, wherein an area where the second housing contacts the latent heat storage material is larger than an area where the first housing contacts the latent heat storage material. At least one of the first housing and the second housing has a dent in the outer periphery,
The accommodating portion is formed at a boundary portion between the first housing and the second housing by connecting the first housing and the second housing in a state in which the recessed portion faces the other housing. The electromechanical integrated drive device according to claim 2 or 3.   In the second housing, the latent heat storage material is housed in the housing portion by connecting the first housing and the second housing in a state where the latent heat storage material is bonded to a portion facing the first housing. The electromechanical integrated drive device according to claim 4.   The electromechanical device according to any one of claims 1 to 5, wherein a plurality of protrusions (55) are provided at least on a side of the inner wall surface (64) of the housing portion on which the power converter is disposed. Body drive.   The electrical machinery according to any one of claims 1 to 6, wherein an expansion absorption portion (63) that absorbs volume expansion when the latent heat storage material changes from a solid phase to a liquid phase is provided in the housing portion. Integrated drive device. The power converter is disposed at a position adjacent to the rotating machine,
The electromechanical integrated drive device according to claim 1, wherein the housing portion is provided on the side opposite to the rotating machine with the power converter interposed therebetween.   The inner wall surface (64) of the said accommodating part is provided with the coating layer (62) formed with the material whose wettability with respect to the said latent heat storage material is higher than the material which forms this accommodating part. The electromechanical integrated drive device according to any one of the above.   The electromechanical integrated drive device according to any one of claims 1 to 9, wherein the latent heat storage material is a low-temperature solder having a melting point of 80 to 160 ° C.   The electromechanical integrated drive according to any one of claims 1 to 10, wherein the heating element is provided on an opposite side of the latent heat storage material with the second housing interposed therebetween, and is in contact with the second housing. apparatus.   The electromechanically integrated drive device according to any one of claims 1 to 11, which is a starter device for starting an engine.

Images