Motor device

Abstract

The purpose of the present disclosure is to provide a motor device in which heat dissipation performance is improved. This motor device (1) is provided with a motor (2) and a second housing (30). The motor (2) has a first housing (20) that houses a rotor (23) and a stator (21). The second housing (30) accommodates a drive circuit (50) that drives the motor (2), and is attached to the first housing (20). A plurality of heat dissipation fins (42) are provided on the surface of the second case (30) facing the first case (20). The plurality of heat dissipation fins (42) are interposed between the second case (30) and the first case (20).

Description

Technical Field

[0001] This disclosure relates to a motor device. More specifically, this disclosure relates to a motor device that integrates a motor and a drive circuit for driving the motor. Background Technology

[0002] Patent Document 1 discloses a power conversion device comprising: a semiconductor power module; a finned heat sink that bears the heat of the semiconductor power module on one side; a cooling body that is engaged with the finned heat sink; and a heat transfer support member. The heat transfer support member transfers heat from a mounting substrate on which circuit components, including heat-generating circuit components that drive the semiconductor power module, to the cooling body. The heat transfer support member supports the mounting substrate at a predetermined interval from the semiconductor power module. This power conversion device is applied to a motor drive circuit that drives a motor for driving a vehicle.

[0003] In a motor device that integrates the motor and the drive circuit that drives the motor, there is a possibility that the temperature of the drive circuit may rise due to the heat generated by the motor.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: International Publication No. 2013 / 31147 Summary of the Invention

[0007] The purpose of this disclosure is to provide a motor device that can reduce the temperature rise of the drive circuit.

[0008] One aspect of this disclosure discloses a motor device comprising a motor and a second housing. The motor has a first housing housing a rotor and a stator. The second housing houses a drive circuit for driving the motor and is mounted within the first housing. A plurality of heat dissipation fins are provided on an opposing surface of the second housing opposite to the first housing. The plurality of heat dissipation fins are positioned between the second housing and the first housing. Attached Figure Description

[0009] Figure 1 This is a cross-sectional view of a motor device according to one embodiment of the present disclosure.

[0010] Figure 2 This is a perspective view of the motor assembly mounted on the platform.

[0011] Figure 3 This is a partial sectional view of the motor device in variation 1.

[0012] Figure 4This is a perspective view of the motor assembly mounted on the platform.

[0013] Figure 5 This is a partial sectional view of the motor device in variation 2.

[0014] Figure 6 This is a partial sectional view of the motor device in variation 2.

[0015] Figure 7 This is a partial sectional view of the motor device in variation 3.

[0016] Figure 8 This is a partial sectional view of the motor device in variation 3.

[0017] Figure 9 This is a partial sectional view of the motor device in variation 4.

[0018] Figure 10 This is a YZ sectional view of the radiator of the motor device in Modified Example 5.

[0019] Figure 11 This is a YZ sectional view of the radiator of the motor device in Modified Example 5.

[0020] Figure 12 This is a cross-sectional view of the motor device in variation 6.

[0021] Figure 13 yes Figure 12 Sectional view A1-A1.

[0022] Figure 14 This is a perspective view of the radiator provided with the motor device in Modified Example 6.

[0023] Figure 15 This is a top view of the comparative example radiator.

[0024] Figure 16 This is a YZ sectional view of the radiator of the motor device in Modified Example 6.

[0025] Figure 17 This is a YZ sectional view of the radiator of the motor device in Modified Example 7.

[0026] Figure 18 This is a YZ sectional view of the radiator of the motor device in Modified Example 7.

[0027] Figure 19 This is a YZ sectional view of the radiator of the motor device in Modified Example 8.

[0028] Figure 20 This is a YZ sectional view of the radiator of the motor device in Modified Example 8.

[0029] Figure 21 This is a YZ sectional view of the radiator of the motor device in Modified Example 9.

[0030] Figure 22 This is a YZ sectional view of the radiator of the motor device in Modified Example 9.

[0031] Figure 23 This is a perspective view of the second radiator of the motor assembly in Modified Example 10. Detailed Implementation

[0032] Hereinafter, the motor device of the embodiments will be described in detail with reference to the accompanying drawings. However, the drawings described in the following embodiments are schematic diagrams, and the dimensional ratios of the components may not reflect the actual dimensional ratios. In addition, the structure described in the following embodiments is merely an example of this disclosure. This disclosure is not limited to the following embodiments, and various modifications can be made according to the design, etc., as long as the effects of this disclosure can be achieved.

[0033] (Implementation Method)

[0034] (1) Summary

[0035] like Figure 1 and Figure 2 As shown, the motor device 1 of this embodiment includes a motor 2 and a second housing 30. The motor 2 has a first housing 20 that houses a rotor 23 and a stator 21. The second housing 30 houses a drive circuit 50 that drives the motor 2 and is mounted on the first housing 20. A plurality of heat dissipation fins 42 are provided on the opposing surface of the second housing 30 opposite to the first housing 20. The plurality of heat dissipation fins 42 are located between the second housing 30 and the first housing 20.

[0036] In the motor device 1 of this embodiment, a plurality of heat dissipation fins 42 are located between the second housing 30 housing the drive circuit 50 and the first housing 20 of the motor 2. Therefore, compared with the case where the opposite surface of the second housing 30 is in direct contact with the first housing 20, the heat of the first housing 20 is less likely to be transferred to the second housing 30.

[0037] Furthermore, the first housing 20 and the second housing 30 are connected by a plurality of heat dissipation fins 42, forming an airflow space SP1 between the first housing 20 and the second housing 30. Therefore, cooler external air can easily enter the space SP1 using the chimney effect. As a result, the efficiency of heat exchange in the plurality of heat dissipation fins 42 can be improved, and the temperature rise of the drive circuit 50 housed in the second housing 30 can be reduced.

[0038] (2) Details

[0039] The following is for reference Figure 1 and Figure 2 The motor device 1 of the embodiment will be described in detail below. In the following description, as... Figure 2 As shown, the arrangement direction of the first housing 20 and the second housing 30, i.e., the X-axis direction, is defined as the front-to-back direction, the Y-axis direction as the left-to-right direction, and the Z-axis direction as the up-down direction. Furthermore, the positive direction of the X-axis is defined as the front, the positive direction of the Y-axis as the right, and the positive direction of the Z-axis as the top. However, the above directions are merely examples and are not intended to define the direction in which the motor device 1 is used. Additionally, the arrows indicating the directions in the accompanying drawings are merely illustrative markings and do not represent actual objects.

[0040] The motor unit 1 is an electromechanical integrated motor that integrates the motor 2 and the control unit 3, which has a drive circuit 50 for controlling the motor 2.

[0041] As described above, the motor unit 1 includes a motor 2 and a control unit 3.

[0042] The motor 2 has a first housing 20 that houses the rotor 23 and the stator 21, etc.

[0043] The first housing 20 includes a cylindrical member 200 and cover members 201 and 202.

[0044] The cylindrical member 200 is formed, for example, from a metal or synthetic resin material into a square tube shape with openings at both ends in the front-to-back direction.

[0045] The cover member 201 is formed into a flat plate shape, for example, from a metal material or a synthetic resin material. The cover member 201 is installed on the cylindrical member 200 by means of bolts or the like to close the opening on the rear side of the cylindrical member 200.

[0046] The cover member 202 is formed into a flat plate shape, for example, from a metal or synthetic resin material. The cover member 202 is mounted to the cylindrical member 200 by bolts or the like in a manner that closes the opening on the front side of the cylindrical member 200. The cover member 202 is provided with a through hole for inserting the shaft 24 of the motor 2.

[0047] A stator 21 and a rotor 23 are housed inside the first housing 20. A coil 22 is provided on the stator 21. The rotor 23 and a shaft 24 are integrally formed, and the shaft 24 is rotatably supported in the first housing 20 by means of bearings 25 and 26. The front end portion of the shaft 24 is inserted into a through hole provided in the cover member 202 and is exposed on the outside of the first housing 20. Furthermore, the bearing 26 is fixed to the cylindrical member 200 or the cover member 201 by means of suitable components. The bearing 25 is fixed to the cover member 202, for example, but may also be fixed to the cylindrical member 200 by means of suitable components.

[0048] The control unit 3 includes a drive circuit 50 for driving the motor 2 and a second housing 30 for housing the drive circuit 50.

[0049] The second housing 30 includes a cylindrical member 31, a radiator 40, and a cover 32.

[0050] The cylindrical member 31 is, for example, formed from a metal or synthetic resin material into a square tube shape with openings at both ends in the front-to-back direction.

[0051] The cover 32 is formed into a flat plate shape, for example, from a synthetic resin material. The cover 32 is installed on the cylindrical member 31 using bolts or the like in a manner that closes the opening on the rear side of the cylindrical member 31.

[0052] The heat sink 40 is formed, for example, from a metal material such as aluminum or a ceramic material with good thermal conductivity. The heat sink 40 has a flat substrate 41 and a plurality of heat dissipation fins 42 disposed on one side of the substrate 41.

[0053] The substrate 41 is mounted to the cylindrical member 31 using bolts or the like in a manner that closes the opening on the front side of the cylindrical member 31. With the radiator 40 mounted on the cylindrical member 31, the front surface 41A of the substrate 41 becomes the front surface of the second housing 30.

[0054] Multiple heat dissipation fins 42 are integrally disposed on the front surface 41A of the substrate 41 (i.e., the front surface of the second housing 30) and the substrate 41. Each of the multiple heat dissipation fins 42 is formed into a relatively elongated cylindrical shape (pin-shaped). The multiple heat dissipation fins 42 are arranged, for example, with a certain interval in both the Y-axis and Z-axis directions. The first axial end (rear end in this embodiment) of each of the multiple heat dissipation fins 42 is connected to the substrate 41. With the second axial end (front end in this embodiment) of each of the multiple heat dissipation fins 42 in contact with the rear surface of the cover member 201 of the first housing 20, the second housing 30 is fixed to the first housing 20 using an appropriate method. That is, the multiple heat dissipation fins 42 are located between the first housing 20 and the second housing 30.

[0055] The drive circuit 50 is housed inside the second housing 30.

[0056] The drive circuit 50 includes, for example, a circuit board 51 on which multiple switching elements 52 constituting the inverter circuit and driver ICs 53 controlling the multiple switching elements 52 are mounted. The circuit board 51 is a double-sided board. For example, multiple switching elements 52 are mounted on the rear mounting surface of the circuit board 51, and multiple driver ICs 53 are mounted on the front mounting surface of the circuit board 51.

[0057] The circuit board 51 is fixed to the substrate 41 of the heat sink 40 via a plurality of metal spacers 54. A heat sink 61, for example made of metal or ceramic material, is fixed to the rear surface of the substrate 41. In addition, a heat sink 62 made of insulating synthetic resin is placed between the heat sink 61 and the driver IC 53 mounted on the front side of the circuit board 51. Therefore, the heat generated by the driver IC 53 is transferred to the substrate 41 of the heat sink 40 via the heat sink 62 and the heat sink 61, and is dissipated from the substrate 41 and the plurality of heat sink fins 42.

[0058] Furthermore, a heat sink 63, made of, for example, metal or ceramic material, is disposed between the circuit board 51 and the cover 32. Multiple metal spacers 55 are positioned between the circuit board 51 and the heat sink 63, and the heat sink 63 is fixed to the substrate 41 of the heat sink 40 via the multiple metal spacers 55 and 54. Additionally, a heat sink 64 made of insulating synthetic resin is positioned between the heat sink 63 and the switching element 52 mounted on the rear side of the circuit board 51. Heat generated by the switching element 52 is transferred to the heat sink 63 via the heat sink 64, and then to the substrate 41 of the heat sink 40 via the metal spacers 55 and 54, and is dissipated from the substrate 41 and the multiple heat sink fins 42.

[0059] For example, such as Figure 2 As shown, the motor assembly 1 is mounted on the platform 110 via the L-shaped flange 100 by fixing the cover member 202 to the flange portion 101 of the L-shaped flange 100. The flange portion 101 is provided with a through hole for inserting the shaft 24 of the motor 2, which is connected to the load device via a coupling.

[0060] Furthermore, the structure of the motor device 1 described above is an example, and the structure of the motor device 1 can be appropriately modified.

[0061] In the motor device 1 of this embodiment, a plurality of heat dissipation fins 42 are provided on the opposing surface (front surface 41A of substrate 41) of the second housing 30, which houses the drive circuit 50, opposite the first housing 20 of the motor 2. The second housing 30 is mounted to the first housing 20 via the plurality of heat dissipation fins 42. Therefore, compared to the case where the opposing surface of the second housing 30 is in direct contact with the first housing 20, the heat generated by the motor 2 is less likely to be transferred to the second housing 30, thus reducing the temperature rise of the drive circuit 50. Furthermore, the first housing 20 and the second housing 30 are connected via the plurality of heat dissipation fins 42, forming an airflow space SP1 between them, allowing cooler external air to easily enter the space SP1 using the chimney effect. This improves the efficiency of heat exchange in the plurality of heat dissipation fins 42, further reducing the temperature rise of the drive circuit 50 housed in the second housing 30.

[0062] Furthermore, in the second housing 30, the heat from the drive circuit 50 is also dissipated from the surface other than the front surface 30A where the heat dissipation fins 42 are provided. In this embodiment, the cover 32, which forms the rear surface of the second housing 30, is made of a synthetic resin material, but the cover 32 may also be made of a metal material. Compared to the case where the cover 32 is made of a synthetic resin material, by making the cover 32 of metal, it is easier to dissipate the heat from the drive circuit 50 from the cover 32, and the temperature rise of the drive circuit 50 can be further reduced.

[0063] (3) Variations

[0064] The above-described embodiments are merely one of the various embodiments of this disclosure. Various modifications can be made to the above-described embodiments, depending on the design, etc., as long as the purpose of this disclosure is achieved.

[0065] Hereinafter, variations of the above-described embodiments are listed. These variations can be appropriately combined for application. Furthermore, the above-described embodiments may be referred to as the basic structure below.

[0066] (3.1) Variation Example 1

[0067] Reference Figure 3 and Figure 4 The motor device 1 of Modified Example 1 will be described.

[0068] For the motor device 1 of Modified Example 1, the difference from the basic structure is that a plurality of second heat dissipation fins 72 are provided on the side opposite to the opposing surface (front surface 41A of the substrate 41) of the first housing 20 in the second housing 30. Furthermore, the same reference numerals are used for constituent elements common to the basic structure, and illustrations and descriptions are omitted. Additionally, the plurality of heat dissipation fins 42 described in the basic structure will be referred to as a plurality of first heat dissipation fins, and the radiator 40 will be referred to as a first radiator 40. Furthermore, the opposing surface (front surface 41A of the substrate 41) of the second housing 30 opposite to the first housing 20 will be referred to as the first surface 30A, and the side of the second housing 30 opposite to the first surface 30A will be referred to as the second surface 30B.

[0069] In addition to the first radiator 40 described above, the motor device 1 of Modified Example 1 also has a second radiator 70 with a plurality of second heat dissipation fins 72.

[0070] The second heat sink 70 is formed, for example, from a metal material such as aluminum or a ceramic material with good thermal conductivity. The second heat sink 70 has a flat substrate 71 and a plurality of second heat dissipation fins 72 provided on the rear surface 71A of the substrate 71.

[0071] The substrate 71 is mounted to the cylindrical member 31 using bolts or the like in a manner that closes the opening on the rear side of the cylindrical member 31. With the second heat sink 70 mounted on the cylindrical member 31, the rear surface 71A of the substrate 71 becomes the second surface 30B of the second housing 30.

[0072] Multiple second heat dissipation fins 72 are integrally disposed on the rear surface 71A of the substrate 71 (i.e., the second surface 30B of the second housing 30) and the substrate 71. Each of the multiple second heat dissipation fins 72 is formed into a relatively elongated cylindrical shape (pin-shaped). The multiple second heat dissipation fins 72 are arranged, for example, with a certain interval in both the Y-axis and Z-axis directions. The front ends of each of the multiple second heat dissipation fins 72 are connected to the substrate 71, and each of the multiple second heat dissipation fins 72 protrudes rearward from the rear surface 71A of the substrate 71 (the second surface 30B of the second housing 30).

[0073] Furthermore, in the motor device 1 of Modified Example 1, the rear surface of the heat sink 63 is in contact with the front surface of the substrate 71 of the second heat sink 70. A heat sink 64 made of insulating synthetic resin is positioned between the heat sink 63 and the switching element 52 mounted on the rear side of the circuit board 51. Therefore, heat generated by the switching element 52, etc., is transferred to the substrate 71 of the second heat sink 70 via the heat sink 64 and the heat sink 63, and is dissipated from the substrate 71 and the plurality of second heat sink fins 72, etc.

[0074] In the motor device 1 of Modified Example 1, heat generated by the driver IC 53 and the like, which are mounted on the front mounting surface of the circuit board 51, is dissipated from the first heat sink 40 via heat sink 62 and heat sink 61. Additionally, heat generated by the switching element 52 and the like, which are mounted on the rear mounting surface of the circuit board 51, is dissipated from the second heat sink 70 via heat sink 64 and heat sink 63. Thus, heat generated by the drive circuit 50 is dissipated from both the first heat sink 40 and the second heat sink 70, thereby improving heat dissipation performance compared to the basic structure and further reducing the temperature rise of the drive circuit 50.

[0075] (3.2) Variation Example 2

[0076] Reference Figure 5 and Figure 6 The motor device 1 of Modified Example 2 will be described.

[0077] For the motor device 1 in Modification 2, the difference from Modification 1 is that the arrangement interval D1 of the plurality of first heat dissipation fins 42 and the arrangement interval D2 of the plurality of second heat dissipation fins 72 are different. Furthermore, the same reference numerals are used for the constituent elements common to Modification 1, and illustrations and descriptions are omitted.

[0078] The arrangement spacing D1 of the plurality of first heat dissipation fins 42 can be appropriately varied according to the total heat generated by at least one heat-generating component (hereinafter referred to as the first heat-generating component) that is thermally coupled to the first heat sink 40 in the circuit components constituting the drive circuit 50. Similarly, the arrangement spacing D2 of the plurality of second heat dissipation fins 72 can be appropriately varied according to the heat generated by at least one heat-generating component (hereinafter referred to as the second heat-generating component) that is thermally coupled to the second heat sink 70 in the circuit components constituting the drive circuit 50.

[0079] Here, when the total heat generated by the first heating element is greater than the total heat generated by the second heating element, it is preferable that, Figure 5 As shown, the arrangement spacing D1 of the plurality of first heat dissipation fins 42 is narrower than the arrangement spacing D2 of the plurality of second heat dissipation fins 72. If the surface areas of each first heat dissipation fin 42 and second heat dissipation fin 72 are the same, then by making the arrangement density of the plurality of first heat dissipation fins 42 higher than the arrangement density of the plurality of second heat dissipation fins 72, the surface area of ​​the first heat sink 40 can be larger than the surface area of ​​the second heat sink 70. As a result, the heat dissipation performance of the first heat sink 40 can be improved compared to the heat dissipation performance of the second heat sink 70, the temperature rise of the first heat-generating component whose total heat generation is greater than that of the second heat-generating component can be reduced, and the temperature rise of the drive circuit 50 can be reduced.

[0080] Furthermore, when the total heat generated by the second heating element is greater than the total heat generated by the first heating element, it is preferable that, Figure 6 As shown, the arrangement spacing D2 of the plurality of second heat dissipation fins 72 is narrower than the arrangement spacing D1 of the plurality of first heat dissipation fins 42. If the surface areas of each first heat dissipation fin 42 and the second heat dissipation fins 72 are the same, then by making the arrangement density of the plurality of second heat dissipation fins 72 higher than the arrangement density of the plurality of first heat dissipation fins 42, the surface area of ​​the second heat sink 70 can be larger than the surface area of ​​the first heat sink 40. As a result, the heat dissipation performance of the second heat sink 70 can be improved compared to the heat dissipation performance of the first heat sink 40, the temperature rise of the second heat-generating component (whose total heat generation is greater than that of the first heat-generating component) can be reduced, and the temperature rise of the drive circuit 50 can be reduced.

[0081] (3.3) Variation Example 3

[0082] Reference Figure 7 and Figure 8 The motor device 1 of Modified Example 3 will be described.

[0083] For the motor device 1 in Modified Example 3, the difference from Modified Example 1 is that the lengths L1 of the plurality of first heat dissipation fins 42 and the lengths L2 of the plurality of second heat dissipation fins 72 are different in the arrangement direction of the first housing 20 and the second housing 30. Furthermore, the same reference numerals are used for the constituent elements common to Modified Example 1, and illustrations and descriptions are omitted.

[0084] In Modification 3, the length L1 of the plurality of first heat dissipation fins 42 in the arrangement direction is set to be the same. The length of the plurality of first heat dissipation fins 42 may also vary within the range of manufacturing tolerances, and the length L1 of the plurality of first heat dissipation fins 42 in the arrangement direction is the average length of the plurality of first heat dissipation fins 42. The length L1 of the plurality of first heat dissipation fins 42 can be appropriately changed according to the total heat generated by the first heat-generating component thermally coupled to the first heat sink 40.

[0085] Furthermore, in Modification 3, the length L2 of the plurality of second heat dissipation fins 72 in the arrangement direction is set to be the same. The length of the plurality of second heat dissipation fins 72 may also vary within the range of manufacturing tolerances, and the length L2 of the plurality of second heat dissipation fins 72 in the arrangement direction is the average length of the plurality of second heat dissipation fins 72. The length L2 of the plurality of second heat dissipation fins 72 can be appropriately changed according to the heat generated by the second heat-generating component thermally coupled to the second heat sink 70.

[0086] Here, when the total heat generated by the first heating element is greater than the total heat generated by the second heating element, it is preferable that, Figure 7 As shown, in the arrangement direction, the length L1 of the plurality of first heat dissipation fins 42 is longer than the length L2 of the plurality of second heat dissipation fins 72. Therefore, the surface area of ​​each first heat dissipation fin 42 can be larger than the surface area of ​​each second heat dissipation fin 72. If the arrangement spacing of the first heat dissipation fins 42 and the arrangement spacing of the second heat dissipation fins 72 are the same, the surface area of ​​the first heat sink 40 can be larger than the surface area of ​​the second heat sink 70. As a result, the heat dissipation performance of the first heat sink 40 can be improved compared to that of the second heat sink 70, the temperature rise of the first heat-generating component (whose total heat generation is greater than that of the second heat-generating component) can be reduced, and the temperature rise of the drive circuit 50 can be reduced.

[0087] Furthermore, when the total heat generated by the second heating element is greater than the total heat generated by the first heating element, it is preferable that, Figure 8As shown, in the arrangement direction, the length L2 of the plurality of second heat dissipation fins 72 is longer than the length L1 of the plurality of first heat dissipation fins 42. This allows the surface area of ​​each second heat dissipation fin 72 to be larger than the surface area of ​​each first heat dissipation fin 42. If the arrangement spacing of the first heat dissipation fins 42 and the arrangement spacing of the second heat dissipation fins 72 are the same, then the surface area of ​​the second heat sink 70 can be larger than the surface area of ​​the first heat sink 40. As a result, the heat dissipation performance of the second heat sink 70 can be improved compared to that of the first heat sink 40, the temperature rise of the second heat-generating component (whose total heat generation is greater than that of the first heat-generating component) can be reduced, and the temperature rise of the drive circuit 50 can be reduced.

[0088] Furthermore, in Modification 3, the arrangement interval D1 of the plurality of first heat dissipation fins 42 and the arrangement interval D2 of the plurality of second heat dissipation fins 72 can be made different from each other, just as in Modification 2, so that the heat dissipation performance of the first heat sink 40 and the heat dissipation performance of the second heat sink 70 can be adjusted.

[0089] (3.4) Variation Example 4

[0090] Reference Figure 9 The motor device 1 of Modified Example 4 will be described.

[0091] For the motor device 1 in Modification 4, the difference from Modification 1 is that at least one of the plurality of driver ICs 53 (53A, 53B) mounted on the mounting surface of the circuit board 51 (e.g., driver IC 53A) is thermally coupled to the first heat sink 40, and at least one driver IC (e.g., driver IC 53B) is thermally coupled to the second heat sink 70. Furthermore, the same reference numerals are used for components common to Modification 1, and illustrations and descriptions are omitted.

[0092] The circuit board 51 is mounted on the substrate 41 of the first heat sink 40 via metal spacers 54. A heat sink 61, made of, for example, metal or ceramic material, is fixed to the rear surface of the substrate 41 in front of the driver IC 53A. A heat sink 62 made of insulating synthetic resin is positioned between the driver IC 53A and the heat sink 61. Heat generated by the driver IC 53A is transferred to the substrate 41 of the heat sink 40 via the heat sink 62 and the heat sink 61, and is dissipated from the substrate 41 and the heat sink fins 42.

[0093] Furthermore, a heat sink 63, made of, for example, a metal or ceramic material, is disposed between the circuit board 51 and the substrate 71 of the second heat sink 70, with the rear surface of the heat sink 63 in contact with the substrate 71 of the second heat sink 70. Multiple metal spacers 55 are interposed between the circuit board 51 and the heat sink 63, and the heat sink 63 is connected to the circuit board 51 via the multiple metal spacers 55. A heat sink 64 made of insulating synthetic resin is interposed between the heat sink 63 and the switching element 52 mounted on the rear side of the circuit board 51. Heat generated by the switching element 52 is transferred to the substrate 71 of the second heat sink 70 via the heat sink 64 and the heat sink 63, and is dissipated from the substrate 71 and the multiple second heat sink fins 72.

[0094] Furthermore, a heat sink 65, made of, for example, metal or ceramic material, is disposed between the substrate 41 of the first heat sink 40 and the driver IC 53B mounted on the front side of the circuit board 51. A heat sink 66 made of insulating synthetic resin is positioned between the driver IC 53B and the heat sink 65. The heat sink 65 does not contact the substrate 41 but is fixed to the circuit board 51 via metal spacers 56. The heat sink 65 is thermally coupled to the substrate 71 of the second heat sink 70 via metal spacers 56, 55, and the heat sink 63. Therefore, heat generated by the driver IC 53B is transferred to the heat sink 63 via the heat sink 66, and then to the substrate 71 of the second heat sink 70 via the metal spacers 56, 55, and the heat sink 63, and is dissipated from the substrate 71 and the plurality of second heat sink fins 72, etc.

[0095] Thus, the second housing 30 houses a plurality of heat-generating components constituting the drive circuit 50. Furthermore, the plurality of heat-generating components include at least one first heat-generating component thermally connected to a plurality of first heat-dissipating fins 42, and at least one second heat-generating component thermally connected to a plurality of second heat-dissipating fins 72.

[0096] In other words, the plurality of heat-generating components include at least one first heat-generating component thermally connected to the first heat sink 40, and at least one second heat-generating component thermally connected to the second heat sink 70.

[0097] exist Figure 9In the example, driver IC53A is thermally coupled to the first heat sink 40, driver IC53B is thermally coupled to the second heat sink 70, and switching element 52 is thermally coupled to the second heat sink 70. However, the connection of the multiple heat-generating components to either the first heat sink 40 or the second heat sink 70 can be appropriately varied. Preferably, the connection of the multiple heat-generating components to either the first heat sink 40 or the second heat sink 70 is determined based on the heat generated by the multiple heat-generating components, as well as the heat dissipation performance of the first heat sink 40 and the second heat sink 70. For example, the connection of the multiple heat-generating components to either the first heat sink 40 or the second heat sink 70 can be determined in such a way that the heat transferred from the heat-generating components to the first heat sink 40 and the heat transferred from the heat-generating components to the second heat sink 70 are equal. By distributing the heat of multiple heat-generating components equally to the first heat sink 40 and the second heat sink 70, the heat of the multiple heat-generating components can be dissipated from both the first heat sink 40 and the second heat sink 70, thereby reducing the temperature rise of the drive circuit 50.

[0098] Furthermore, if the heat dissipation performance of the first heat sink 40 is higher than that of the second heat sink 70, the heat from the multiple heat-generating components can be distributed between the first heat sink 40 and the second heat sink 70 in such a way that the heat transferred from the drive circuit 50 to the first heat sink 40 is greater than the heat transferred from the drive circuit 50 to the second heat sink 70. Similarly, if the heat dissipation performance of the second heat sink 70 is higher than that of the first heat sink 40, the heat from the multiple heat-generating components can be distributed between the first heat sink 40 and the second heat sink 70 in such a way that the heat transferred from the drive circuit 50 to the second heat sink 70 is greater than the heat transferred from the drive circuit 50 to the first heat sink 40.

[0099] (3.5) Variation Example 5

[0100] Reference Figure 10 The motor device 1 of Modified Example 5 will be described.

[0101] like Figure 10 As shown, the motor device 1 of Modified Example 5 differs from the basic structure in that the plurality of heat dissipation fins 42 provided on the front surface 41A of the substrate 41 of the heat sink 40 are arranged in an alternating manner. Furthermore, in the motor device 1 of Modified Example 5, except for the arrangement of the plurality of heat dissipation fins 42, it is the same as the basic structure; therefore, the same reference numerals are used for the constituent elements common to the basic structure, and the illustrations and descriptions are omitted.

[0102] On the front surface 41A of the substrate 41, a plurality of heat dissipation fins 42 are arranged alternately in the following manner: a first column in which the plurality of heat dissipation fins 42 are arranged at equal intervals along the Y-axis direction, and a second column in which the plurality of heat dissipation fins 42 are arranged at the same interval as the first column along the Y-axis direction and are positioned offset from the first column by (1 / 2) intervals.

[0103] Furthermore, the arrangement pattern of the plurality of heat dissipation fins 42 disposed on the front surface 41A of the substrate 41 can be appropriately changed. For example, it could be as follows: Figure 11 As shown, multiple rows of heat dissipation fins 42 are arranged at equal intervals along the Y-axis, with the positions of the heat dissipation fins 42 in the Y-axis direction being the same. Here, there is also a situation where... Figure 11 The arrangement pattern of multiple heat dissipation fins 42 shown is called a grid configuration.

[0104] In the case where multiple heat dissipation fins 42 are staggered on the front surface 41A of the substrate 41, compared with the case where multiple heat dissipation fins 42 are arranged in a grid on the front surface 41A of the substrate 41, the distance to the four heat dissipation fins 42 arranged around them can be set to be equal, thereby making the heat dissipation performance of the multiple heat dissipation fins 42 uniform.

[0105] Furthermore, in the second heat sink 70 described in variations 2 to 4, the arrangement pattern of the plurality of second heat dissipation fins 72 disposed on the rear surface 71A of the substrate 71 can be appropriately changed. The arrangement pattern of the plurality of second heat dissipation fins 72 can be staggered, gridded, or other arrangements.

[0106] (3.6) Variation Example 6

[0107] Reference Figures 12-14 The motor device 1 of Modified Example 6 will be described.

[0108] For the motor device 1 of Modified Example 6, the difference from the basic structure is that a plurality of heat dissipation fins 42A, each formed in the shape of a flat plate, are provided on the front surface 41A of the substrate 41 of the heat sink 40. Furthermore, in the motor device 1 of Modified Example 6, except for the plurality of heat dissipation fins 42A, it is the same as the basic structure; therefore, the same reference numerals are used for the constituent elements common to the basic structure, and the illustrations and descriptions are omitted.

[0109] Figure 12 This is a ZX sectional view of motor unit 1. Figure 13 yes Figure 12 Sectional view A1-A1 in the middle, Figure 14 This is a three-dimensional view of the radiator 40 as seen from the front.

[0110] In the substrate 41 of the radiator 40, a ventilation passage 43 is provided in the vertical direction on the opposite surface (front surface 41A) opposite to the first housing 20. No heat dissipation fins 42A are provided in the central portion of the front surface 41A of the substrate 41 in the horizontal direction; the area without heat dissipation fins 42A becomes the ventilation passage 43 (see reference). Figure 13 ).

[0111] On the front surface 41A of the substrate 41, a plurality of heat dissipation fins 42A are provided on the left and right sides across the ventilation passage 43. In other words, the plurality of heat dissipation fins 42A includes a plurality of first fins 421 located in the region on the right side of the ventilation passage 43 in the opposite surface, and a plurality of second fins 422 located in the region on the left side of the ventilation passage 43 in the opposite surface.

[0112] Multiple first fins 421 are formed as plates extending along a first direction DR1. Preferably, the angle θ1 formed by the first direction DR1, which is parallel to the length direction of the first fins 421, with respect to the vertical direction (Z-axis direction) is, for example, 40 to 70 degrees. The multiple first fins 421 are arranged on opposite surfaces of the substrate 41 at certain intervals in directions orthogonal to the first direction DR1 and the X-axis direction, respectively.

[0113] Furthermore, the plurality of second fins 422 are formed in a plate shape extending along the second direction DR2. Preferably, the angle θ2 formed by the second direction DR2, which is parallel to the length direction of the second fins 422, with respect to the vertical direction (Z-axis direction) is, for example, 40 degrees to 70 degrees. The plurality of second fins 422 are arranged on the opposite surface of the substrate 41 at certain intervals in directions orthogonal to the second direction DR2 and the X-axis direction, respectively.

[0114] exist Figure 13 In the diagram, arrows indicate the first direction DR1, which is the length direction of the first fin 421, and the second direction DR2, which is the length direction of the second fin 422. When viewed from above, the opposing surfaces (front surface 41A) are obliquely tilted relative to the vertical direction (Z-axis direction).

[0115] Thus, on the opposite side of the substrate 41 of the radiator 40, a plurality of first fins 421, each formed in a plate shape, are arranged on the right side of the ventilation passage 43, and a plurality of second fins 422, each formed in a plate shape, are arranged on the left side of the ventilation passage 43.

[0116] Here, the plurality of first fins 421 and the plurality of second fins 422 are respectively formed such that the further upward they are, the farther they are from the ventilation passage 43. In other words, the plurality of first fins 421 and the plurality of second fins 422 are respectively inclined such that the first end of the side closest to the ventilation passage 43 is located lower than the second end on the opposite side.

[0117] In addition, the plurality of first fins 421 and the plurality of second fins 422 are formed in a shape symmetrical with respect to the ventilation path 43.

[0118] Therefore, the rising air in the ventilation path 43 flows from the ventilation path 43 to the flow path 431 between the plurality of first fins 421 or the flow path 432 between the plurality of second fins 422, moving upward through the flow path 431 or the flow path 432. Here, the plurality of first fins 421 and the plurality of second fins 422 are formed in a symmetrical shape with respect to the ventilation path 43, so that the air can flow equally from the ventilation path 43 to the flow paths 431 and 432. Furthermore, by the air flowing through the flow paths 431 and 432, heat exchange can occur between the first fins 421 and the air flowing through the flow path 431, and between the second fins 422 and the air flowing through the flow path 432, thereby reducing the temperature rise and fall of the drive circuit 50.

[0119] Figure 15 This is a top view of the comparative example heat sink 40C. In the comparative example heat sink 40C, a plurality of heat dissipation fins 42 extending in the vertical direction are arranged in a left-right direction on the front surface 41A of the substrate 41, and a flow path 44 for air to pass through is provided between two adjacent heat dissipation fins 42. Furthermore, Figure 15 The dashed arrows in the image indicate the flow of air.

[0120] Here, inside the second housing 30, the air heated by the heating element moves upward, so the temperature of the upper region B1 on the front surface 41A of the substrate 41, which is the opposite surface 30A of the second housing 30, is higher than the temperature of the lower region. In the comparative example, if the air flowing into the flow path 44 from the lower side of the radiator 40C rises within the flow path 44, there is a possibility that thermal interference will occur between the airflow and the warm air present in the upper part of the flow path 44, thereby worsening the airflow and reducing the heat dissipation performance of the radiator 40C.

[0121] In contrast, in the motor device 1 of Modified Example 6, the plurality of first fins 421 and the plurality of second fins 422 are inclined at an angle such that the first end near the ventilation passage 43 is positioned lower than the second end on the opposite side, so that air moves outward through the flow passages 431 and 432. Thus, the air flowing into the flow passages 431 and 432 from the ventilation passage 43 avoids the upper center of the opposite surfaces, thereby suppressing the obstruction of airflow due to thermal interference. Therefore, it has the advantage that by making the movement of air within the flow passages 431 and 432 smoother, the heat dissipation performance of the radiator 40 can be improved, and the temperature rise of the drive circuit 50 can be suppressed.

[0122] also, Figure 13 The shapes of the first fin 421 and the second fin 422 shown are examples and can be modified appropriately.

[0123] For example, it could also be, such as Figure 16 As shown, the plurality of first fins 421 and the plurality of second fins 422 are respectively shaped such that the higher they are, the closer they are to the ventilation passage 43. In other words, the plurality of first fins 421 and the plurality of second fins 422 may be inclined such that the first end of each fin is positioned higher than the second end on the opposite side of the ventilation passage 43. In this case, the air flowing from the outside of the radiator 40 into the flow path 431 between the plurality of first fins 421 or the flow path 432 between the plurality of second fins 422 moves upward within the flow path 431 or the flow path 432, and is either discharged directly to the outside of the radiator 40 or passes through the ventilation passage 43 to the outside of the radiator 40. A portion of the air flowing in flow paths 431 and 432 merges with the airflow path 43 and is discharged from the airflow path 43 to the outside of the radiator 40. Therefore, the airflow passing through flow paths 431 and 432 can be made smoother by utilizing the chimney effect, which can improve the heat dissipation performance of the multiple first fins 421 and multiple second fins 422. As a result, the heat dissipation performance of the radiator 40 can be improved, and the temperature rise of the drive circuit 50 can be suppressed.

[0124] Furthermore, the shapes of the plurality of first fins 421 and the plurality of second fins 422 are not limited to the shapes described above and can be appropriately modified. The plurality of first fins 421 and the plurality of second fins 422 are formed in a flat plate shape, but they can also be bent in an arc shape as viewed from the front. In addition, the plurality of first fins 421 and the plurality of second fins 422 are formed in a symmetrical shape with respect to the ventilation passage 43, but they can also be formed in an asymmetrical shape with respect to the ventilation passage 43.

[0125] In addition, the ventilation passage 43 is located in the center of the opposite side of the substrate 41 of the radiator 40 in the left-right direction, but it may also be located in the area offset to the right or left from the center.

[0126] (3.7) Variation Example 7

[0127] Reference Figure 17 and Figure 18 The radiator 40 of the motor device 1 in Modified Example 7 will be described.

[0128] In the radiator 40 of the motor device 1 in Modification 6, the width of the ventilation path 43 is constant (see reference). Figure 13 However, in Modification 7, the difference from Modification 6 is as follows: Figure 17 As shown, the lower passage width D3 of the ventilation passage 43 is wider than the upper passage width D4 of the ventilation passage 43. Here, the passage width of the ventilation passage 43 refers to the width of the ventilation passage 43 in the left-right direction, which is the width of the space between the straight line LN1 connecting the left ends of the plurality of first fins 421 and the straight line LN2 connecting the right ends of the plurality of second fins 422. Therefore, the lower passage width D3 of the ventilation passage 43 is the distance between the straight lines LN1 and LN2 at the lower end of the ventilation passage 43, and the upper passage width D4 of the ventilation passage 43 is the interval between the straight lines LN1 and LN2 at the upper end of the ventilation passage 43. Furthermore, in Modification 7, except for the passage width of the ventilation passage 43, it is the same as Modification 6. Therefore, the same reference numerals are used for the constituent elements common to Modification 6, and the illustrations and descriptions are omitted.

[0129] exist Figure 17 In the radiator 40 shown, the width of the ventilation passage 43 becomes wider towards the lower side. Therefore, compared with the case where the width of the ventilation passage 43 is constant, it has the advantage that air can easily flow from the ventilation passage 43 to the flow path 431 between adjacent first fins 421 and the flow path 432 between adjacent second fins 422.

[0130] In addition, Figure 17 In the example, the width of the ventilation path 43 varies linearly as it descends (in other words, as it ascends), but it can also vary non-linearly. Alternatively, the width of the ventilation path 43 can gradually vary in that it is wider at the bottom than at the top.

[0131] In addition, Figure 17 In the radiator 40 shown, a plurality of first fins 421 and a plurality of second fins 422 are inclined at a position where the first end of the radiator 43 is located lower than the second end on the opposite side, but the shape of the first fins 421 and the second fins 422 can be appropriately changed.

[0132] It could also be, such as Figure 18As shown, in a radiator 40 in which multiple first fins 421 and multiple second fins 422 are inclined such that the first end of the ventilation passage is located above the second end on the opposite side, the passage width of the lower part of the ventilation passage 43 is wider than the passage width of the upper part of the ventilation passage 43.

[0133] In this case, compared to the case where the passage width of ventilation path 43 is constant, it has the advantage that air flowing in the flow path 431 between two adjacent first fins 421 and the flow path 432 between two adjacent second fins 422 can easily flow into ventilation path 43.

[0134] (3.8) Variation Example 8

[0135] Reference Figure 19 and Figure 20 The radiator 40 of the motor device 1 in Modified Example 8 will be described.

[0136] Figure 19 This is a YZ sectional view of the radiator 40 of the motor device 1 in Modified Example 8.

[0137] In the radiator 40 of the motor device 1 in Modification 8, the difference from Modification 6 is that the spacing D11 of the plurality of first fins 421 is wider at the lower part of the substrate 41 than at the upper part of the substrate 41, and the spacing D12 of the plurality of second fins 422 is wider at the lower part of the substrate 41 than at the upper part of the substrate 41. Here, the spacing D11 of the plurality of first fins 421 refers to the spacing between two adjacent first fins 421. Similarly, the spacing D12 of the plurality of second fins 422 refers to the spacing between two adjacent second fins 422. Furthermore, in Modification 8, except that the spacing D11 of the plurality of first fins 421 and the spacing D12 of the plurality of second fins 422 vary in the vertical direction, it is the same as Modification 6. Therefore, the same reference numerals are used for the constituent elements common to Modification 6, and the illustrations and descriptions are omitted.

[0138] exist Figure 19 In the heat sink 40 shown, since the spacing D11 of the first fins 421 widens towards the lower side, it has the advantage that air can easily flow from the ventilation passage 43 into the flow path 431 between adjacent first fins 421 compared to the case where the spacing D11 of the first fins 421 is constant. Similarly, since the spacing D12 of the second fins 422 widens towards the lower side, it has the advantage that air can easily flow from the ventilation passage 43 into the flow path 432 between adjacent second fins 422 compared to the case where the spacing D12 of the second fins 422 is constant.

[0139] In addition, Figure 19In the example, the spacing D11 of the first fin 421 and the spacing D12 of the second fin 422 increase by a certain amount as they move towards the lower part of the substrate 41, but this can also be a non-linear change. Alternatively, the spacing D11 of the first fin 421 and the spacing D12 of the second fin 422 can gradually change in a manner where they are wider at the lower part of the substrate 41 than at the upper part of the substrate 41.

[0140] In addition, Figure 19 In the radiator 40 shown, a plurality of first fins 421 and a plurality of second fins 422 are inclined at a position where the first end of the radiator 43 is located lower than the second end on the opposite side, but the shape of the first fins 421 and the second fins 422 can be appropriately changed.

[0141] It could also be, such as Figure 20 As shown, in a radiator 40 in which multiple first fins 421 and multiple second fins 422 are inclined such that the first end of the radiator is located closer to the ventilation passage 43 than the second end on the opposite side, the spacing D11 of the first fins 421 and the spacing D12 of the second fins 422 are wider at the lower part of the substrate 41 than at the upper part of the substrate 41.

[0142] In this case, compared to the case where the spacing D11 of the first fin 421 and the spacing D12 of the second fin 422 are constant, it has the advantage that the air flowing in the flow path 431 between adjacent first fins 421 and the flow path 432 between adjacent second fins 422 can easily flow into the ventilation path 43.

[0143] (3.9) Variation Example 9

[0144] Reference Figure 21 and Figure 22 The radiator 40 of the motor device 1 in Modified Example 9 will be described.

[0145] Figure 21 This is a YZ sectional view of the radiator 40 of the motor device 1 in Modified Example 9.

[0146] In the radiator 40 of the motor device 1 in Modification 9, the difference from Modification 6 is that the inclination of the first direction DR1 along which the first fin 421 runs is greater with respect to the vertical direction at the lower part of the substrate 41 than at the upper part of the substrate 41, and the inclination of the second direction DR2 along which the second fin 422 runs is greater with respect to the vertical direction at the lower part of the substrate 41 than at the upper part of the substrate 41. Furthermore, in Modification 9, except for the first fin 421 and the second fin 422, it is the same as in Modification 6; therefore, the same reference numerals are used for the constituent elements common to Modification 9, and illustrations and descriptions are omitted.

[0147] exist Figure 21 In the heat sink 40 shown, the tilt angles of the first direction DR1 (that is, the length direction of the first fin 421) relative to the vertical direction are different among the plurality of first fins 421. In addition, the tilt angles of the second direction DR2 (that is, the length direction of the second fin 422) relative to the vertical direction are different among the plurality of second fins 422.

[0148] More specifically, among the plurality of first fins 421, the inclination of the first direction DR1 relative to the vertical direction gradually increases from the upper part to the lower part of the substrate 41. As a result, the flow path 431 between adjacent first fins 421 is wider at the lower part of the substrate 41 than at the upper part of the substrate 41, allowing air to flow more easily through the flow path 431, thus providing the advantage of improved heat dissipation performance.

[0149] Similarly, among the multiple second fins 422, the inclination of the second direction DR2 relative to the vertical direction gradually increases from the upper part to the lower part of the substrate 41. As a result, the flow path 432 between adjacent second fins 422 is wider at the lower part of the substrate 41 than at the upper part of the substrate 41, and air can easily flow through the flow path 432, thus having the advantage of improved heat dissipation performance.

[0150] In addition, Figure 21 In the example, the tilt angles of the first direction DR1 relative to the vertical direction and the tilt angles of the second direction DR2 relative to the vertical direction gradually increase by a constant amount as the substrate 41 moves from the top to the bottom, but the amount of increase does not necessarily have to be constant. Alternatively, the tilt angles of the first direction DR1 relative to the vertical direction and the tilt angles of the second direction DR2 relative to the vertical direction may increase non-linearly as the substrate 41 moves from the top to the bottom.

[0151] In addition, Figure 21 In the radiator 40 shown, a plurality of first fins 421 and a plurality of second fins 422 are inclined at a position where the first end of the radiator 43 is located lower than the second end on the opposite side, but the shape of the first fins 421 and the second fins 422 can be appropriately changed.

[0152] It can also be configured as follows: Figure 22 As shown, in a radiator 40 in which multiple first fins 421 and multiple second fins 422 are inclined such that the first end of the radiator is located closer to the ventilation passage 43 than the second end on the opposite side, the inclination of the first direction DR1 relative to the vertical direction and the inclination of the second direction DR2 relative to the vertical direction are greater at the lower part of the substrate 41 than at the upper part of the substrate 41.

[0153] In this case, compared to the cases where the inclination of the first direction DR1 relative to the vertical direction and the inclination of the second direction DR2 relative to the vertical direction are constant, the widths of the portions connecting the flow path 431 and the ventilation path 43 between adjacent first fins 421 and adjacent second fins 422, and the portions connecting the flow path 432 and the ventilation path 43 between adjacent second fins 422, respectively, become wider. As a result, air flowing in the flow paths 431 and 432 can more easily flow into the ventilation path 43, improving the heat dissipation performance of the first fins 421 and adjacent second fins 422, and reducing the temperature rise of the drive circuit 50.

[0154] (3.10) Variation Example 10

[0155] Reference Figure 23 The motor device 1 of Modified Example 10 will be described.

[0156] In the motor device 1 of Modification 10, the difference from Modification 2 is that, similar to Modification 6, a flat heat dissipation fin 42A is provided on the front surface 41A of the substrate 41 of the first heat sink 40, and a flat second heat dissipation fin 72A is provided on the rear surface 71A of the substrate 71 of the second heat sink 70. Furthermore, in the motor device 1 of Modification 10, except for the first heat sink 40 and the second heat sink 70, it is the same as Modification 2; therefore, the same reference numerals are used for the common components as in Modification 2, and the figures and descriptions are omitted.

[0157] The first radiator 40 of the motor device 1 in Modification 10 has the same structure as the radiator 40 described in Modification 6, so its description is omitted. In addition, the ventilation passage 43 provided on the front surface 41A of the substrate 41 of the first radiator 40 is called the first ventilation passage 43.

[0158] Figure 23 This is a perspective view of the second heat sink 70 provided in the motor device 1 of Modified Example 10. A second ventilation passage 73 is provided in the vertical direction on the rear surface 71A (the second surface 30B on the side opposite to the first surface) of the substrate 71 of the second heat sink 70. No second heat dissipation fins 72A are provided in the central part in the horizontal direction of the rear surface 71A of the substrate 71, and the area where no second heat dissipation fins 72A are provided becomes the second ventilation passage 73.

[0159] Furthermore, on the rear surface 71A of the substrate 71, a plurality of second heat dissipation fins 72A are provided on the left and right sides across the second ventilation passage 73. In other words, the plurality of second heat dissipation fins 72A includes a plurality of third fins 721 located in the region on the right side of the second ventilation passage 73 in the second surface 30B, and a plurality of fourth fins 722 located in the region on the left side of the second ventilation passage 73 in the second surface 30B.

[0160] Multiple third fins 721 are formed as plates extending along the third direction DR3. These third fins 721 are arranged at regular intervals on the rear surface 71A (second surface 30B) of the substrate 71 in directions orthogonal to both the third direction DR3 and the X-axis. Multiple fourth fins 722 are formed as plates extending along the fourth direction DR4. These fourth fins 722 are arranged at regular intervals on the rear surface 71A (second surface 30B) of the substrate 71 in directions orthogonal to both the fourth direction DR4 and the X-axis. Furthermore, when viewing the second surface 30B from above, the third direction DR3 and the fourth direction DR4 are obliquely inclined relative to the vertical direction (Z-axis direction). Figure 23 In the diagram, arrows indicate the third direction DR3, which is the length direction of the third fin 721, and the fourth direction DR4, which is the length direction of the fourth fin 722.

[0161] Thus, on the second surface 30B of the substrate 71 of the second heat sink 70, a plurality of third fins 721, each formed in a plate shape, are arranged on the right side of the second ventilation passage 73, and a plurality of fourth fins 722, each formed in a plate shape, are arranged on the left side of the second ventilation passage 73.

[0162] Here, the plurality of third fins 721 and the plurality of fourth fins 722 are formed in a shape symmetrical with respect to the second ventilation passage 73.

[0163] Furthermore, the plurality of third fins 721 and the plurality of fourth fins 722 are inclined at an angle, with the first end of the second ventilation passage 73 located at a position lower than the second end on the opposite side.

[0164] Therefore, the rising air in the second ventilation passage 73 flows from the second ventilation passage 73 to the flow passage 731 between two adjacent third fins 721 or the flow passage 732 between two adjacent fourth fins 722, moving upward through the flow passages 731 or 732. Here, the plurality of third fins 721 and the plurality of fourth fins 722 are inclined at an angle such that the first end of the second ventilation passage 73 is located lower than the second end on the opposite side. Therefore, the air moves outward through the flow passages 731 and 732, avoiding the upper center of the substrate 71, thus suppressing the obstruction of airflow due to thermal interference. Therefore, by making the airflow within the flow passages 731 and 732 smoother, the heat dissipation performance of the second heat sink 70 can be improved, and the temperature rise of the drive circuit 50 can be suppressed.

[0165] also, Figure 23The shapes of the third fin 721 and the fourth fin 722 shown are examples and can be modified appropriately. For example, the multiple third fins 721 and the multiple fourth fins 722 may be inclined at an angle such that the first end of the second ventilation passage 73 is positioned higher than the second end on the opposite side. In this case, the air flowing into the flow passages 731 and 732 from the outside of the second radiator 70 moves upward within the flow passages 731 and 732, and is either discharged directly to the outside of the second radiator 70 or passes through the second ventilation passage 73 and is discharged to the outside of the second radiator 70. Here, the air moves inward through the flow passages 731 between the multiple third fins 721 and the flow passages 732 between the multiple fourth fins 722, so the airflow in the flow passages 731 and 732 can be made smooth by utilizing the chimney effect, thereby improving the heat dissipation performance of the second radiator 70.

[0166] Furthermore, the shape and arrangement of the plurality of third fins 721 and the plurality of fourth fins 722 provided by the second radiator 70 can be appropriately changed, and can also be formed to have the same shape and arrangement as the plurality of first fins 421 and the plurality of second fins 422 described in the modified examples 7 to 9.

[0167] (3.11) Other variations

[0168] The structure of the motor 2 shown in the basic structure and variations 1 to 10 is one example, and can be appropriately modified.

[0169] In the basic structure and variations 1 to 10, multiple heat dissipation fins 42, 42A are in contact with the cover member 201 of the motor 2. However, a plate-shaped heat insulation member can also be installed on the outer side of the cover member 201 so that the multiple heat dissipation fins 42 are in contact with the heat insulation member.

[0170] (Summarize)

[0171] Based on the implementation methods described above, the following methods are disclosed.

[0172] The motor device (1) of the first type includes a motor (2) and a second housing (30). The motor (2) has a first housing (20) that houses a rotor (23) and a stator (21). The second housing (30) houses a drive circuit (50) that drives the motor (2) and is mounted on the first housing (20). A plurality of heat dissipation fins (42) are provided on the opposite surface of the second housing (30) that is opposite to the first housing (20). The plurality of heat dissipation fins (42) are located between the second housing (30) and the first housing (20).

[0173] According to this method, compared to the case where the opposite surface of the second housing (30) is in direct contact with the first housing (20), heat from the first housing (20) is less likely to be transferred to the second housing (30). Furthermore, by having multiple heat dissipation fins (42) positioned between the first housing (20) and the second housing (30), a space for airflow is formed between them, allowing cooler external air to easily enter the space between them using the chimney effect. As a result, the efficiency of heat exchange within the multiple heat dissipation fins (42) is improved, reducing the temperature rise of the drive circuit (50) housed in the second housing (30).

[0174] For the motor device (1) of the second type, in the first type, the multiple heat dissipation fins (42) are multiple first heat dissipation fins (42), and multiple second heat dissipation fins (72) are provided on the side opposite to the opposite side in the second housing (30).

[0175] According to this method, heat can be dissipated from multiple heat dissipation fins (42) on the opposite side of the second housing (30) and multiple second heat dissipation fins (72) on the side opposite to the opposite side, thereby further reducing the temperature rise of the drive circuit (50).

[0176] For the motor device (1) of the third method, in the second method, the arrangement intervals of the plurality of first heat dissipation fins (42) and the arrangement intervals of the plurality of second heat dissipation fins (72) are different from each other.

[0177] According to this method, by setting the configuration interval of multiple first heat dissipation fins (42) and multiple second heat dissipation fins (72), the heat dissipation area of ​​multiple first heat dissipation fins (42) and the heat dissipation area of ​​multiple second heat dissipation fins (72) can be changed.

[0178] For the motor device (1) of the fourth type, in the third type, the arrangement interval of the plurality of first heat dissipation fins (42) is narrower than the arrangement interval of the plurality of second heat dissipation fins (72).

[0179] According to this method, if the surface area of ​​each first heat dissipation fin (42) and the second heat dissipation fin (72) is the same, the heat dissipation area of ​​the plurality of first heat dissipation fins (42) can be increased compared with the heat dissipation area of ​​the plurality of second heat dissipation fins (72).

[0180] For the motor device (1) of the fifth type, in any of the second to fourth types, the lengths of the plurality of first heat dissipation fins (42) and the plurality of second heat dissipation fins (72) are different in the arrangement direction of the first housing (20) and the second housing (30).

[0181] According to this method, by setting the length of multiple first heat dissipation fins (42) and the length of multiple second heat dissipation fins (72), the heat dissipation area of ​​multiple first heat dissipation fins (42) and the heat dissipation area of ​​multiple second heat dissipation fins (72) can be changed.

[0182] For the motor device (1) of the sixth method, in the fifth method, in the arrangement direction, the length of the plurality of first heat dissipation fins (42) is longer than the length of the plurality of second heat dissipation fins (72).

[0183] According to this method, if the number of the first heat dissipation fins (42) and the second heat dissipation fins (72) are the same, the heat dissipation area of ​​the multiple first heat dissipation fins (42) can be increased compared with the heat dissipation area of ​​the multiple second heat dissipation fins (72).

[0184] For the motor device (1) of the seventh type, in any of the second to sixth types, a plurality of heat-generating components (52, 53) constituting the drive circuit (50) are housed in the second housing (30). The plurality of heat-generating components (52, 53) include at least one first heat-generating component that is thermally connected to a plurality of first heat dissipation fins (42), and at least one second heat-generating component that is thermally connected to a plurality of second heat dissipation fins (72).

[0185] According to this method, it is possible to set whether to set multiple heat-generating components (52, 53) as first heat-generating components or multiple heat-generating components (52, 53) as second heat-generating components based on the heat dissipation capacity of multiple first heat dissipation fins (42) and multiple second heat dissipation fins (72).

[0186] For the motor device (1) of the eighth embodiment, in any of the first to seventh embodiments, a ventilation passage (43) is provided on the opposite surface along the vertical direction. The plurality of heat dissipation fins (42) include a plurality of first fins (421) located in the region to the right of the ventilation passage (43) on the opposite surface, and a plurality of second fins (422) located in the region to the left of the ventilation passage (43) on the opposite surface. The plurality of first fins (421) are formed as plates extending along a first direction (DR1), and the plurality of second fins (422) are formed as plates extending along a second direction (DR2). When viewed from above, the first direction (DR1) and the second direction (DR2) are obliquely inclined relative to the vertical direction.

[0187] According to this method, since the first direction (DR1) and the second direction (DR2) are inclined relative to the vertical direction, when air moves in the flow path between the plurality of first fins (421) and the flow path between the plurality of second fins (422), thermal interference with the warm air present in the upper part of the flow path can be suppressed. Therefore, the heat dissipation performance of the plurality of first fins (421) and the plurality of second fins (422) can be improved, and the temperature rise of the drive circuit (50) can be reduced.

[0188] For the motor device (1) of the ninth type, in the eighth type, a plurality of first fins (421) and a plurality of second fins (422) are formed in a shape symmetrical with respect to the ventilation path (43).

[0189] According to this method, the airflow in the flow path between multiple first fins (421) and the airflow in the flow path between multiple second fins (422) can be made equal.

[0190] For the motor device (1) of the 10th type, in the 8th or 9th type, the plurality of first fins (421) and the plurality of second fins (422) are inclined at an angle such that the first end of the ventilation passage (43) is located on the lower side of the second end on the opposite side.

[0191] According to this method, air moves outward through the flow path between the multiple first fins (421) and the multiple second fins (422), so the air flow in the flow path can become smooth, which can improve the heat dissipation performance of the multiple first fins (421) and the multiple second fins (422).

[0192] For the motor device (1) of the 11th type, in any of the 8th to 10th types, the plurality of first fins (421) and the plurality of second fins (422) are inclined at an angle such that the first end of the ventilation passage (43) is located above the second end on the opposite side.

[0193] According to this method, air flows from the flow path between multiple first fins (421) and the flow path between multiple second fins (422) to the ventilation path (43), so the air flow in the flow path can be made smooth by utilizing the chimney effect, which can improve the heat dissipation performance of multiple first fins (421) and multiple second fins (422).

[0194] For the motor device (1) of the 12th type, in any of the 2nd to 7th types, a first ventilation passage (43) is provided on the first surface, which is the opposite surface, along the vertical direction. A plurality of first heat dissipation fins (42) include a plurality of first fins (421) located on the right side of the first ventilation passage (43) on the first surface, and a plurality of second fins (422) located on the left side of the first ventilation passage (43) on the opposite surface. The plurality of first fins (421) are formed as plates extending along a first direction (DR1), and the plurality of second fins (422) are formed as plates extending along a second direction (DR2). When the first surface is viewed from above, the first direction (DR1) and the second direction (DR2) are obliquely inclined relative to the vertical direction. In the second housing (30), a second ventilation passage (73) is provided on the second surface, which is opposite to the first surface, along the vertical direction. The plurality of second heat dissipation fins (72) include a plurality of third fins (721) located in the region on the right side of the second ventilation passage (73) on the second surface, and a plurality of fourth fins (722) located in the region on the left side of the second ventilation passage (73) on the second surface. The plurality of third fins (721) are formed as plates extending along a third direction (DR3), and the plurality of fourth fins (722) are formed as plates extending along a fourth direction (DR4). When the second surface is viewed from above, the third direction (DR3) and the fourth direction (DR4) are obliquely inclined relative to the vertical direction, respectively.

[0195] According to this method, since the first direction (DR1) and the second direction (DR2) are inclined relative to the vertical direction, when air moves in the flow path between the plurality of first fins (421) and the plurality of second fins (422), thermal interference with the warm air present in the upper part of the flow path can be suppressed. Therefore, the heat dissipation performance of the plurality of first fins (421) and the plurality of second fins (422) can be improved, and the temperature rise of the drive circuit (50) can be reduced. In addition, since the third direction (DR3) and the fourth direction (DR4) are inclined relative to the vertical direction, when air moves in the flow path between the plurality of third fins (721) and the plurality of fourth fins (722), thermal interference with the warm air present in the upper part of the flow path can be suppressed. Therefore, the heat dissipation performance of the plurality of third fins (721) and the plurality of fourth fins (722) can be improved, and the temperature rise of the drive circuit (50) can be reduced.

[0196] For the motor device (1) of the 13th type, in the 12th type, a plurality of third fins (721) and a plurality of fourth fins (722) are formed in a shape symmetrical with respect to the second ventilation path (73).

[0197] According to this method, the airflow in the flow path between multiple third fins (721) and the airflow in the flow path between multiple fourth fins (722) can be made equal.

[0198] For the motor device (1) of the 14th type, in the 12th or 13th type, the plurality of third fins (721) and the plurality of fourth fins (722) are inclined at an angle such that the first end of the second ventilation passage (73) is located at a position lower than the second end on the opposite side.

[0199] According to this method, air moves outward through the flow path between multiple third fins (721) and multiple fourth fins (722), so the air flow in the flow path can become smooth, which can improve the heat dissipation performance of multiple third fins (721) and multiple fourth fins (722).

[0200] For the motor device (1) of the 15th type, in any of the 12th to 14th types, the plurality of third fins (721) and the plurality of fourth fins (722) are inclined at an angle such that the first end of the second ventilation passage (73) is located above the second end on the opposite side.

[0201] According to this method, air moves inward through the flow path between multiple third fins (721) and multiple fourth fins (722), so the air flow in the flow path can be made smooth by utilizing the chimney effect, which can improve the heat dissipation performance of multiple third fins (721) and multiple fourth fins (722).

[0202] Regarding the structures of methods 2 to 15, which are not necessary for the motor device (1), they can be appropriately omitted.

[0203] Explanation of reference numerals in the attached figures

[0204] 1. Motor assembly; 2. Motor; 20. First housing; 21. Stator; 23. Rotor; 30. Second housing; 42. Heat sink fin (first heat sink fin); 43. Ventilation path (first ventilation path); 50. Drive circuit; 52. Switching element (heat-generating component); 53. Driver IC (heat-generating component); 72. Second heat sink fin; 73. Second ventilation path; 421. First fin; 422. Second fin; 721. Third fin; 722. Fourth fin; DR1, first direction; DR2, second direction.

Claims

1. A motor device, wherein, The motor device has the following features: The motor has a first housing that houses the rotor and stator; and The second housing, which houses the drive circuitry for driving the motor, is mounted on the first housing. The second housing has multiple heat dissipation fins on its opposite surface to the first housing. The plurality of heat dissipation fins are located between the second housing and the first housing.

2. The motor device according to claim 1, wherein, The plurality of heat dissipation fins are plurality of first heat dissipation fins. A plurality of second heat dissipation fins are provided on the side of the second housing opposite to the opposite surface.

3. The motor device according to claim 2, wherein, The configuration intervals of the plurality of first heat dissipation fins and the configuration intervals of the plurality of second heat dissipation fins are different from each other.

4. The motor device according to claim 3, wherein, The spacing between the plurality of first heat dissipation fins is narrower than the spacing between the plurality of second heat dissipation fins.

5. The motor device according to any one of claims 2 to 4, wherein, In the arrangement direction of the first housing and the second housing, the lengths of the plurality of first heat dissipation fins and the plurality of second heat dissipation fins are different from each other.

6. The motor device according to claim 5, wherein, In the arrangement direction, the length of the plurality of first heat dissipation fins is longer than the length of the plurality of second heat dissipation fins.

7. The motor device according to any one of claims 2 to 6, wherein, The second housing houses multiple heat-generating components that constitute the drive circuit. The plurality of heating components include at least one first heating component thermally connected to the plurality of first heat dissipation fins, and at least one second heating component thermally connected to the plurality of second heat dissipation fins.

8. The motor device according to any one of claims 1 to 7, wherein, A ventilation path is provided on the opposite surface along the vertical direction. The plurality of heat dissipation fins include a plurality of first fins located in the region on the right side of the ventilation path in the opposite surface, and a plurality of second fins located in the region on the left side of the ventilation path in the opposite surface. The plurality of first fins are formed as plates extending along a first direction, and the plurality of second fins are formed as plates extending along a second direction. When viewed from above, the first direction and the second direction are obliquely inclined relative to the vertical direction.

9. The motor device according to claim 8, wherein, The plurality of first fins and the plurality of second fins are formed in a shape symmetrical with respect to the ventilation path.

10. The motor device according to claim 8 or 9, wherein, The plurality of first fins and the plurality of second fins are respectively inclined at a position where the first end of the ventilation passage is located lower than the second end on the opposite side.

11. The motor device according to any one of claims 8 to 10, wherein, The plurality of first fins and the plurality of second fins are respectively inclined at a position where the first end of the ventilation passage is located above the second end on the opposite side.

12. The motor device according to any one of claims 2 to 7, wherein, A first ventilation path is provided along the vertical direction on the first surface, which is the opposite surface. The plurality of first heat dissipation fins include a plurality of first fins located in the region on the right side of the first ventilation path on the first surface, and a plurality of second fins located in the region on the left side of the first ventilation path on the opposite surface. The plurality of first fins are formed as plates extending along a first direction, and the plurality of second fins are formed as plates extending along a second direction. When viewed from above, the first surface is inclined obliquely relative to the vertical direction, as are the first direction and the second direction. In the second housing, a second ventilation passage is provided on the second surface, opposite to the first surface, along the vertical direction. The plurality of second heat dissipation fins include a plurality of third fins located in the region on the right side of the second ventilation path on the second surface, and a plurality of fourth fins located in the region on the left side of the second ventilation path on the second surface. The plurality of third fins are formed as plates extending along a third direction, and the plurality of fourth fins are formed as plates extending along a fourth direction. When viewed from above, the second surface is inclined at an angle relative to the vertical direction, as are the third and fourth directions.

13. The motor device according to claim 12, wherein, The plurality of third fins and the plurality of fourth fins are formed in a shape symmetrical with respect to the second ventilation path.

14. The motor device according to claim 12 or 13, wherein, The plurality of third fins and the plurality of fourth fins are respectively inclined at a position where the first end of the second ventilation passage is located lower than the second end on the opposite side.

15. The motor device according to any one of claims 12 to 14, wherein, The plurality of third fins and the plurality of fourth fins are respectively tilted at an angle such that the first end of the second ventilation passage is located above the second end on the opposite side.

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