Electromechanical integrated motor unit

Abstract

To provide a mechanical and electrical integrated motor unit capable of performing efficient cooling.SOLUTION: The mechanical and electrical integrated motor unit includes a motor and an inverter for driving the motor in which the motor and the inverter are placed adjacent to each other in the axial direction of the motor and integrated. The motor has an annular stator core and windings provided onto the stator core, in which a cooler is provided adjacent to the stator core, the windings, and the inverter in the radial direction of the stator core, which is the direction perpendicular to the axial direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a mechanically and electrically integrated motor unit. [Background technology]

[0002] Patent Document 1 discloses a technique in which a cooling passage is disposed between a motor and an inverter to cool both of them. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 05-292703 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 discloses a technique for sharing a cooling passage between a motor and an inverter, but does not take into consideration the arrangement and configuration for efficient cooling.

[0005] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a mechanically and electrically integrated motor unit that can be cooled efficiently. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the electromechanical integrated motor unit of the present invention comprises a motor and an inverter that drives the motor, and is an electromechanical integrated motor unit in which the motor and the inverter are integrated and adjacent to each other in the axial direction of the motor, and is characterized in that the motor has a circular stator core and windings provided on the stator core, and a cooler is provided adjacent to the stator core, the windings, and the inverter in the radial direction of the stator core, which is a direction perpendicular to the axial direction.

[0007] This allows the motor and the inverter to share the cooler, thereby enabling efficient cooling.

[0008] In addition, the electromechanical integrated motor unit of the present invention comprises a motor and an inverter that drives the motor, and is an electromechanical integrated motor unit in which the motor and the inverter are adjacent to each other in the axial direction of the motor, and is characterized in that the motor has a circular stator core and windings provided on the stator core, and a cooler is sandwiched between the windings and the inverter in the axial direction.

[0009] This allows the motor and the inverter to share the cooler, thereby enabling efficient cooling.

[0010] In addition, in the above, the stator core has an annular back yoke and a plurality of teeth protruding radially from the back yoke, and the winding is composed of a plurality of slot conductors provided in slots between each of the plurality of teeth, and a plurality of crossover conductors that are electrically connected to portions of the slot conductors protruding from the slots in the axial direction and electrically connect any of the slot conductors together, and the plurality of crossover conductors may be stacked at predetermined intervals in the axial direction.

[0011] This reduces the axial height of the motor, thereby enabling the electromechanical integrated motor unit to be made smaller.

[0012] In the above, a thermally conductive insulator may be provided to cover the connecting conductor.

[0013] This improves the insulation between the crossover conductors, and also facilitates the transfer of heat from the crossover conductors to the cooler through the thermally conductive insulator, thereby improving cooling performance.

[0014] In the above, a plurality of substrates may be provided on which the plurality of crossover conductors are respectively arranged.

[0015] As a result, by stacking the substrates on which the crossover conductors are arranged in the axial direction, the slot conductors and the crossover conductors can be electrically connected at the end face side in the axial direction of the motor, thereby reducing the axial height of the motor and making it possible to miniaturize the electromechanical integrated motor unit.

[0016] In the above, a thermally conductive insulating layer may be provided on the substrate.

[0017] This improves the insulation between the connecting conductors, and also facilitates the transfer of heat from the connecting conductors to the cooler through the thermally conductive insulating layer, thereby improving cooling performance. [Effects of the Invention]

[0018] The mechanically and electrically integrated motor unit according to the present invention has the effect of being able to perform efficient cooling while sharing the cooling passage. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a mechanically and electrically integrated motor unit according to the first embodiment. [Figure 2] FIG. 2 is a partial perspective view of the mechanically and electrically integrated motor unit according to the first embodiment, cut in the axial direction. [Figure 3] FIG. 3 is a diagram showing a connection portion between a slot conductor and a crossover conductor. [Figure 4] FIG. 4 is a diagram showing an example of wiring of a crossover conductor. [Figure 5] FIG. 5 is a partial cross-sectional view of the mechanically and electrically integrated motor unit according to the first embodiment cut in the axial direction. [Figure 6] FIG. 6 is an explanatory diagram of the heat dissipation path from the motor and inverter to the cooler. [Figure 7] FIG. 7 is a partial cross-sectional view of an integrated mechanical and electrical motor unit cut in the axial direction when the inverter board protrudes from the outer periphery of the stator in the radial direction. [Figure 8]FIG. 8 is a partial cross-sectional view of another example of the mechanically and electrically integrated motor unit according to the first embodiment, cut in the axial direction. [Figure 9] FIG. 9 is an explanatory diagram of the heat dissipation path from the motor and inverter to the cooler. [Figure 10] FIG. 10 is an explanatory diagram of the insulators provided on the substrate and slot conductors of the crossover portion. [Figure 11] FIG. 11 is a diagram showing a schematic configuration of a mechanically and electrically integrated motor unit according to the second embodiment. [Figure 12] FIG. 12 is a partial perspective view of the mechanically and electrically integrated motor unit according to the second embodiment, cut in the axial direction. [Figure 13] FIG. 13 is a partial cross-sectional view of the mechanically and electrically integrated motor unit according to the second embodiment, cut in the axial direction. [Figure 14] FIG. 14 is an explanatory diagram of the heat dissipation path from the motor and inverter to the cooler. [Figure 15] FIG. 15 is a partial cross-sectional view of a mechanically and electrically integrated motor unit of another configuration example according to the second embodiment, cut in the axial direction. [Figure 16] FIG. 16 is an explanatory diagram of the heat dissipation path from the motor and inverter to the cooler. [Figure 17] Fig. 17(a) is a diagram showing an example of an inverter using discrete elements as semiconductor elements, and Fig. 17(b) is a diagram showing an example of an inverter using a power module. [Figure 18] Fig. 18(a) is a diagram showing the number of SiC chips when discrete elements are used as semiconductor elements, and Fig. 18(b) is a diagram showing the number of SiC chips when a power module is used. DETAILED DESCRIPTION OF THE INVENTION

[0020] (Embodiment 1) A first embodiment of the mechanically and electrically integrated motor unit according to the present invention will be described below, although the present invention is not limited to this embodiment.

[0021] FIG. 1 is a diagram showing a schematic configuration of a mechanically and electrically integrated motor unit 1 according to a first embodiment. As shown in FIG. 1, the mechanically and electrically integrated motor unit 1 according to the embodiment is composed of a motor 2 and an inverter 3. The mechanically and electrically integrated motor unit 1 is mounted on, for example, an electric vehicle. The motor 2 is a rotating electric machine composed of a rotor provided with a rotor shaft 21, a stator, and the like, and is driven by power supplied from a power source (not shown) via the inverter 3. The mechanically and electrically integrated motor unit 1 according to the first embodiment is a drive unit (mechanically and electrically integrated device) in which the motor 2 and the inverter 3 are stacked and integrated in the axial direction of the rotor shaft 21 of the motor 2, via connecting wire portions 4 serving as coil end portions of the stator of the motor 2 in the axial direction.

[0022] 2 is a partial perspective view of the mechanically and electrically integrated motor unit 1 according to embodiment 1 cut in the axial direction. Note that in FIG. 2, the rotor that constitutes the motor 2 is not shown.

[0023] The stator 22 of the motor 2 has a cylindrical stator core 221. The stator core 221 includes an annular back yoke 222 and a plurality of teeth 223 extending radially inward from the back yoke 222, with slots 224 formed between the plurality of teeth 223 in the circumferential direction. The number of slots 224 is arbitrary, but in this embodiment, as an example, there are 48 slots 224. A plurality of slot conductors 225, which are columnar conductors extending in the axial direction, are arranged in the slots 224. A magnetic field for applying a driving force to the rotor can be generated by passing a current through the slot conductors 225.

[0024] The inverter 3 is composed of an inverter board 31, a plurality of semiconductor elements 32 and a wiring pattern (not shown) provided on the inverter board 31, etc. The inverter 3 is electrically connected to a battery (not shown) and the slot conductors 225 of the motor 2, and controls the driving of the motor 2 by controlling the power supplied from the battery to the motor 2. The semiconductor elements 32 and wiring pattern that constitute the inverter 3 are not limited to being provided on the inverter board 31, and may be incorporated in the crossover section 4, for example, or may be configured separately from the inverter board 31 and mounted on top of the inverter board 31.

[0025] The crossover portion 4 constitutes a so-called coil end portion of the winding (stator coil) of the stator 22. As shown in FIGS. 3 and 4 , the crossover portion 4 is provided on an end face of the stator core 221 in the axial direction, and a plurality of crossover conductors 41 for electrically connecting any two slot conductors 225 together are provided on the end face side of the back yoke 222 in the axial direction. Each of the plurality of crossover conductors 41 is made of a plate-shaped thick copper conductor. For example, as shown in FIG. 3 , the crossover conductor 41 is electrically connected to a protruding portion of the slot conductor 225 that protrudes from inside the slot 224 in the axial direction. Note that, for example, soldering, welding, fitting, and the like can be used as a joining method for electrically connecting the crossover conductors 41 and the slot conductors 225. In addition, the multiple crossover conductors 41 each extend radially from the slot 224 side to the back yoke 222 side in the radial direction of the stator 22, are arranged concentrically above the back yoke 222, and are stacked at predetermined intervals in the axial direction.

[0026] In the electrically-mechanically integrated motor unit 1 according to the first embodiment, the slot conductors 225 and the connecting conductors 41 are made of different conductors, which allows the conductors to have an appropriate cross-sectional shape depending on the location where they are arranged while maintaining the same cross-sectional area. As an example, the slot conductors 225 have a nearly square cross-sectional shape that conforms to the shape of the slots 224, and the connecting conductors 41 are arranged as flat conductors that reduce the height of the coil end portions of the stator 22. This makes it possible to reduce the size of the electrically-mechanically integrated motor unit 1. Furthermore, in the electrically-mechanically integrated motor unit 1 according to the first embodiment, the inverter 3 can be arranged not only above the back yoke 222 but also above the slots 224 in the axial direction. This makes it possible to provide an electrically-mechanically integrated motor unit 1 in which the inverter 3 is arranged near the axial end of the stator 22 while minimizing an increase in axial dimension. Furthermore, in the electrically-mechanically integrated motor unit 1 according to the first embodiment, the wiring connecting the motor 2 and the inverter 3 can be shortened, thereby reducing power loss.

[0027] The cooling device is provided to cool the electromechanical integrated motor unit 1 using cooling water. This cooling device is composed of a water pump, a cooler 5, a radiator, etc. The water pump is, for example, an electric type, and is provided to circulate the coolant through a coolant circuit. The cooler 5 is configured such that a flow path 52 through which the coolant 53 flows is formed inside a rectangular flow path forming member 51, and the coolant 53 flowing through the flow path 52 removes heat from the stator 22, the connecting wire portion 4, and the inverter 3 (inverter board 31). The radiator is provided to cool the coolant 53 with outside air by exchanging heat between the coolant 53 flowing inside and the outside air.

[0028] In the electrically and mechanically integrated motor unit 1 according to the first embodiment, the flow path forming member 51 of the cooler 5 is configured to contact the outer peripheral surface of the stator core 221, the outer peripheral surface of the insulating material 42 of the connecting wire portion 4, and the outer peripheral surface of the inverter 3 (inverter board 31) via the thermally conductive insulating sheet 62, which is an insulator with high thermal conductivity. This allows the cooler 5 to be shared by the stator core 221, the connecting wire portion 4, and the inverter 3, thereby enabling efficient cooling.

[0029] FIG. 5 is a partial cross-sectional view of the mechanically and electrically integrated motor unit 1 according to the first embodiment cut in the axial direction.

[0030] Furthermore, in the electrically and mechanically integrated motor unit 1 according to the first embodiment, as shown in Fig. 5, the crossover conductors 41 of the crossover section 4 are molded by covering (wrapping) them with an insulating material 42, which is an insulator with high thermal conductivity, thereby improving the insulation between the crossover conductors and facilitating the transfer of heat from the crossover conductors 41 to the cooler 5 through the insulating material 42, thereby improving the cooling performance. Note that reference numeral 61 in Fig. 5 denotes a thermally conductive insulating sheet, which is an insulator with high thermal conductivity, interposed between the inverter board 31 of the inverter 3 and the insulating material 42 of the crossover section 4.

[0031] Here, heat generated in the motor 2 is mainly due to copper loss caused by current flowing through the slot conductors 225 and the connecting conductors 41. As shown in FIG. 6, heat from the slot conductors 225 has two paths: one that passes radially through the stator core 221 to reach the cooler 5, and the other that passes radially through the insulating material 42 to reach the cooler 5. Also, as shown in FIG. 6, heat from the connecting conductors 41 has another path that passes radially through the insulating material 42 to reach the cooler 5. In the inverter 3, heat from the semiconductor elements 32 has two paths: one that passes radially through the inverter board 31 to reach the cooler 5, and the other that passes radially from the inverter board 31 through the insulating material 42 of the connecting wire portion 4 to reach the cooler 5. In the electromechanical integrated motor unit 1 according to the first embodiment, heat from the inverter 3 reaches the cooler 5 via the insulating material 42 of the connecting wire portion 4, so that the heat from the motor 2 and the inverter 3 are combined within the connecting wire portion 4. However, by using a highly thermally conductive material for the insulating material 42 of the connecting wire portion 4, heat dissipation from the motor 2 and the inverter 3 can be achieved with a single cooler 5. This allows the motor 2 and the inverter 3 to share the flow path 52 of the cooler 5, thereby reducing water pump loss, compressing space, and simplifying the cooling system. Furthermore, the electromechanical integrated motor unit 1 according to the first embodiment can be made smaller by adopting a cooling structure that simultaneously dissipates heat from the motor 2 and the inverter 3 to the cooler 5.

[0032] 7, the electromechanical integrated motor unit 1 according to the first embodiment may be configured such that the inverter board 31 of the inverter 3 protrudes from the outer periphery of the stator 22 in the radial direction, so that the inverter board 31 and the flow path forming member 51 of the cooler 5 come into contact with each other. This makes it easier for heat to be dissipated from the inverter board 31 to the cooler 5, and the cooling performance of the inverter 3 by the cooler 5 can be improved.

[0033] In the electromechanical integrated motor unit 1 according to the first embodiment, the crossover portion 4 serving as the coil end portion of the stator 22 may be formed by stacking multiple thin ring-shaped substrates, each having a plurality of crossover conductors 41 arranged circumferentially, in the axial direction.

[0034] FIG. 8 is a partial cross-sectional view of the mechanically and electrically integrated motor unit 1 of another configuration example according to the first embodiment, cut in the axial direction.

[0035] In the electrically and mechanically integrated motor unit 1 according to the first embodiment shown in FIG. 8, eight substrates 43, each having a connecting conductor 41 disposed thereon, are stacked in the axial direction on an end face of a stator core 221 in the axial direction to form a crossover section 4. The number of stacked substrates 43 is not limited to eight as shown in FIG. 8. The connecting conductor 41 is electrically connected to a protruding portion of a slot conductor 225 that protrudes from a slot 224 in the axial direction so as to connect any two slot conductors 225 on the same substrate 43. In the electrically and mechanically integrated motor unit 1 shown in FIG. 8, the connecting conductor 41 is disposed on the substrate 43, but a printed circuit board in which a conductor is bonded to a prepreg or a thick copper board may also be used.

[0036] The slot conductors 225 and the crossover conductors 41 are joined by first placing the slot conductors 225 in the slots 224 of the stator 22, then covering each slot conductor 225 with a layer of integrated crossover conductors 41. After joining the corresponding slot conductors 225 and crossover conductors 41, the next layer is stacked on top of the first and joined. Methods for joining the slot conductors 225 and crossover conductors 41 include soldering, welding, fitting, and 3D printing. Instead of stacking the conductors layer by layer, multiple layers may be stacked simultaneously. Alternatively, the crossover conductors that form the coil end portions on one side of the axial direction of the stator 22 may be integrated and then joined to the slot conductors 225. Alternatively, the crossover conductors 41 and the slot conductors 225 may be formed together and then attached to the stator 22.

[0037] FIG. 9 is an explanatory diagram of the heat dissipation path from the motor 2 and the inverter 3 to the cooler 5. As shown in FIG.

[0038] As shown in FIG. 9 , heat from the slot conductors 225 has two paths: one that passes radially through the stator core 221 to reach the cooler 5, and the other that passes radially through the board 43 of the crossover section 4 to reach the cooler 5. Heat from the crossover conductors 41 also has another path that passes radially through the board 43 to reach the cooler 5. In the inverter 3, heat from the semiconductor elements 32 has two paths: one that passes radially through the inverter board 31 to reach the cooler 5, and one that is transferred axially from the inverter board 31 to the board 43 of the crossover section 4, passes radially through the board 43, and reaches the cooler 5. As a result, in the electromechanical integrated motor unit 1 shown in FIGS. 8 and 9 , heat dissipation from the motor 2 and the inverter 3 can be achieved with a single cooler 5. Sharing the flow path 52 of the cooler 5 between the motor 2 and the inverter 3 reduces water pump loss, compresses space, and simplifies the cooling system.

[0039] In the electromechanically integrated motor unit 1 shown in FIGS. 8 and 9 , the connecting conductors 41 of different potentials may be adjacent to each other at the connecting portion 4 where they overlap in the axial direction. Therefore, for example, as shown in FIG. 10 , it is preferable to provide an insulating layer 44 made of an insulator on the back surface of the substrate 43 (the surface facing the stator core 221 in the axial direction). This improves the insulation between the connecting conductors 41. Furthermore, providing the insulating layer 44 on the back surface of the substrate 43 facilitates heat transfer from the connecting conductors 41 to the cooler 5 through the insulating layer 44, thereby improving cooling performance. Furthermore, it is preferable to cover the conductor portions of the slot conductors 225 that are not electrically connected to the connecting conductors 41 with an insulating coating 226 made of an insulator. This improves the insulation between the slot conductors 225 and the connecting conductors 41 and between adjacent slot conductors 225.

[0040] Furthermore, in the electrically and mechanically integrated motor unit 1 according to the first embodiment, when a plurality of substrates 43 provided with connecting conductors 41 are stacked in the axial direction, a highly thermally conductive insulating material may be sandwiched between adjacent layers in the axial direction (between adjacent substrates 43 in the axial direction). This can improve insulation properties while also improving heat dissipation from the motor 2 and inverter 3 to the cooler 5.

[0041] (Embodiment 2) A second embodiment of the mechanically and electrically integrated motor unit according to the present invention will be described below. Note that the present invention is not limited to this embodiment. In this embodiment, descriptions of parts that are the same as those in the first embodiment will be omitted as appropriate.

[0042] Fig. 11 is a diagram showing a schematic configuration of a mechanically and electrically integrated motor unit 1 according to embodiment 2. Fig. 12 is a partial perspective view of the mechanically and electrically integrated motor unit 1 according to embodiment 2 cut in the axial direction. Fig. 13 is a partial cross-sectional view of the mechanically and electrically integrated motor unit 1 according to embodiment 2 cut in the axial direction. The configuration of the crossover part 4 of the mechanically and electrically integrated motor unit 1 shown in Fig. 13 is similar to the configuration of the crossover part 4 of the mechanically and electrically integrated motor unit 1 shown in Fig. 5 of embodiment 1.

[0043] In the electrically and mechanically integrated motor unit 1 according to the second embodiment, as shown in Figures 11, 12, and 13, the cooler 5 is disposed so as to be sandwiched in the axial direction between the connecting wire portion 4 of the motor 2 and the inverter 3. In the electrically and mechanically integrated motor unit 1 according to the second embodiment, as shown in Figure 13, a thermally conductive insulating sheet 63 made of an insulator with high thermal conductivity is interposed between the inverter 3 (inverter board 31) and the cooler 5 (flow path forming member 51), and a thermally conductive insulating sheet 64 made of an insulator with high thermal conductivity is interposed between the connecting wire portion 4 (insulating material 42) and the cooler 5 (flow path forming member 51). Note that at least one of the thermally conductive insulating sheets 63, 64 may be omitted.

[0044] FIG. 14 is an explanatory diagram of the heat dissipation path from the motor 2 and the inverter 3 to the cooler 5. As shown in FIG.

[0045] 14 , in the electrically and mechanically integrated motor unit 1 according to the second embodiment, there are two paths for heat from the slot conductors 225: one is to pass through the insulating material 42 of the crossover portion 4 in the axial direction and reach the cooler 5, and the other is to pass heat transferred to the stator core 221 through the insulating material 42 of the crossover portion 4 in the axial direction and reach the cooler 5. In addition, there is another path for heat from the crossover conductors 41 to pass through the insulating material 42 in the axial direction and reach the cooler 5. In the inverter 3, there is another path for heat from the semiconductor elements 32 to pass through the inverter board 31 in the axial direction and reach the cooler 5 from the surface of the flow path forming member 51 opposite to the crossover portion 4 side in the axial direction.

[0046] In the electrically-mechanical integrated motor unit 1 according to the second embodiment, heat is dissipated from the motor 2 and heat is dissipated from the inverter 3 separately from both axially opposing sides of the flow path forming member 51 of the cooler 5, so that the heat from both sources does not interfere with each other until it reaches the cooler 5, and heat can be efficiently transferred to the coolant 53. As a result, in the electrically-mechanical integrated motor unit 1 according to the second embodiment, heat dissipation from the motor 2 and the inverter 3 can be achieved with a single cooler 5, and sharing the flow path 52 of the cooler 5 between the motor 2 and the inverter 3 can reduce water pump loss, compress space, and simplify the cooling system. Furthermore, the electrically-mechanical integrated motor unit 1 according to the second embodiment can be made smaller by adopting a cooling structure that dissipates heat from the motor 2 and the inverter 3 to the cooler 5 simultaneously.

[0047] In addition, in the electromechanical integrated motor unit 1 according to the second embodiment, the crossover portion 4 serving as the coil end portion of the stator 22 may be formed by stacking a plurality of thin ring-shaped substrates, each having a plurality of crossover conductors 41 arranged on its circumference, in the axial direction.

[0048] FIG. 15 is a partial cross-sectional view of the mechanically and electrically integrated motor unit 1 of another configuration example according to the second embodiment, cut in the axial direction.

[0049] The configuration of the crossover section 4 of the electrically and mechanically integrated motor unit 1 shown in FIG. 15 is the same as the configuration of the crossover section 4 of the electrically and mechanically integrated motor unit 1 shown in FIG. 8 in the first embodiment, and the cooler 5 is disposed so as to be sandwiched between the crossover section 4 and the inverter 3 in the axial direction. In the electrically and mechanically integrated motor unit 1 shown in FIG. 15, a thermally conductive insulating sheet 63 made of an insulator with high thermal conductivity is interposed between the inverter 3 (inverter board 31) and the cooler 5 (flow path forming member 51), and a thermally conductive insulating sheet 64 made of an insulator with high thermal conductivity is interposed between the crossover section 4 (insulating material 42) and the cooler 5 (flow path forming member 51). Note that at least one of the thermally conductive insulating sheets 63, 64 may be omitted.

[0050] FIG. 16 is an explanatory diagram of the heat dissipation path from the motor 2 and the inverter 3 to the cooler 5. As shown in FIG.

[0051] 16, there are two paths for heat from the slot conductor 225: one path is transmitted in the axial direction to the substrate 43 of the crossover section 4 and reaches the cooler 5, and the other path is transmitted to the stator core 221 and then in the axial direction to the substrate 43 of the crossover section 4 and reaches the cooler 5. There is also a path for heat from the crossover conductor 41 to be transmitted in the axial direction to the substrate 43 and reaches the cooler 5. In the inverter 3, there is a path for heat from the semiconductor element 32 to be transmitted in the axial direction to the inverter substrate 31 and reaches the cooler 5 from the surface of the flow path forming member 51 opposite to the crossover section 4 side in the axial direction.

[0052] As a result, in the electromechanical integrated motor unit 1 shown in Figures 15 and 16, heat dissipation from the motor 2 and inverter 3 can be achieved with a single cooler 5, and by sharing the flow path 52 of the cooler 5 between the motor 2 and the inverter 3, it is possible to reduce water pump loss, compress space, and simplify the cooling system.

[0053] Fig. 17(a) is a diagram showing an example of an inverter 3 using discrete elements as the semiconductor elements 32. Fig. 17(b) is a diagram showing an example of an inverter 3 using a power module 320. Fig. 18(a) is a diagram showing the number of switching elements (e.g., Si chips, SiC chips, GaN chips, etc.) 32a when discrete elements are used as the semiconductor elements 32. Fig. 18(b) is a diagram showing the number of switching elements 320a when a power module 320 is used.

[0054] In the electromechanical integrated motor unit 1 according to the second embodiment, as shown in FIG. 17(a), the semiconductor elements 32 provided on the inverter board 31 as the inverter 3 can be, for example, discrete elements, or alternatively, a power module 320 can be used as shown in FIG. 17(b). As a result, in the electromechanical integrated motor unit 1 according to the second embodiment, as shown in FIG. 18(a), for example, discrete elements are used as the semiconductor elements 32, and the number of switching elements 32a constituting the semiconductor elements 32 per leg is two within the same mounting area. By using the power module 320, the number of switching elements 320a constituting the power module 320 per leg can be increased to four within the same mounting area, compared to a case where the number of switching elements 320a constituting the power module 320 per leg is two within the same mounting area. Furthermore, by using the power module 320, the inverter board 31 can be omitted from the heat dissipation path from the switching elements 320a to the cooler 5, thereby reducing thermal resistance. [Explanation of symbols]

[0055] 1. Electromechanical integrated motor unit 2 motors 3 inverters 4 Crossing section 5 Cooler 21 Rotor shaft 22 Stator 31 Inverter board 32 Semiconductor elements 32a Switching element 41 Crossover conductor 42 Insulating materials 43 Circuit Board 44 Insulating layer 51 Flow path forming member 52 Flow path 53 Coolant 61, 62, 63, 64 Thermally conductive insulating sheet 221 Stator Core 222 Back Yoke 223 Teeth 224 Slots 225 Slotted Conductor 226 Insulating coating 320 Power Module 320a Switching element

Claims

1. A motor; an inverter that drives the motor; Equipped with a mechanically and electrically integrated motor unit in which the motor and the inverter are adjacent to each other in an axial direction of the motor, the motor has an annular stator core and a winding provided on the stator core, the stator core has an annular back yoke and a plurality of teeth protruding radially from the back yoke, the winding is composed of a plurality of slot conductors provided in slots between the plurality of teeth, and a plurality of crossover conductors electrically connected to portions of the slot conductors protruding from the slots in the axial direction and electrically connecting any of the slot conductors together, a plurality of substrates on which the plurality of crossover conductors are respectively arranged, the plurality of substrates are stacked at predetermined intervals in the axial direction to form gaps, An integrated electromechanical motor unit, characterized in that a cooler is provided adjacent to the stator core, the windings, and the inverter in the radial direction of the stator core, which is a direction perpendicular to the axial direction.

2. A motor; an inverter that drives the motor; Equipped with a mechanically and electrically integrated motor unit in which the motor and the inverter are adjacent to each other in an axial direction of the motor, the motor has an annular stator core and a winding provided on the stator core, the stator core has an annular back yoke and a plurality of teeth protruding radially from the back yoke, the winding is composed of a plurality of slot conductors provided in slots between the plurality of teeth, and a plurality of crossover conductors electrically connected to portions of the slot conductors protruding from the slots in the axial direction and electrically connecting any of the slot conductors together, a plurality of substrates on which the plurality of crossover conductors are respectively arranged, the plurality of substrates are stacked at predetermined intervals in the axial direction to form gaps, An electromechanical integrated motor unit, characterized in that a cooler is sandwiched between the winding and the inverter in the axial direction.

3. 3. The mechanically and electrically integrated motor unit according to claim 1, wherein the substrate is provided with a thermally conductive insulating layer.

Images