Electric motor assembly

Abstract

To provide a motor assembly which can suppress the temperature in a terminal box and can be reduced in size.SOLUTION: The electric motor assembly 1 includes a drive shaft 5, a motor 18 that rotates the drive shaft 5, a motor casing 10 in which the motor 18 is disposed, an inverter 20 that controls the operation of the motor 18, and a terminal box 40 provided outside the motor casing 10. The connection box 40 includes a box body 51 on which electronic components can be mounted, an attachment plate 52 having an attachment surface 10a attached to an outer surface 52a of the motor casing 10, and a connection leg portion 53 that connects the box body 51 and the attachment plate 52. The coupling leg portion 53 has an area smaller than that of the mounting plate 52 when viewed from a direction orthogonal to the mounting surface 52a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electric motor assembly. [Background technology]

[0002] Currently, demand for energy conservation in industrial machinery is increasing, and motors are also being required to save energy by operating at an optimal operating point. Conventionally, electric motor assemblies that integrate a motor and an inverter have been used. The inverter can optimize motor operation by controlling the motor's rotation speed. The electric motor assembly includes, for example, a terminal box on the outer surface of the motor that houses electronic components connected to the inverter.

[0003] In an electric motor assembly, the heat from the motor can cause electronic components in the terminal box to reach high temperatures. For this reason, electric motor assemblies often use a cooling structure to keep the temperature of the electronic components below an allowable temperature. One example of a cooling structure is a structure in which the connection between the motor and the terminal box is formed high, thereby increasing the distance between the motor and the terminal box (see, for example, Patent Document 1). Another cooling structure can also use a dedicated cooling fan (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-010477 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-239744 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the electric motor assembly described in Patent Document 1, the terminal box is placed far away from the motor, which can increase the overall size.In the electric motor assembly described in Patent Document 2, a dedicated fan is required, making it difficult to reduce the size.

[0006] An object of one aspect of the present invention is to provide an electric motor assembly that can suppress the temperature inside a terminal box and can be made compact. [Means for solving the problem]

[0007] An electric motor assembly according to aspect 1 of the present invention comprises a drive shaft, a motor for rotating the drive shaft, a motor casing in which the motor is arranged, an inverter for controlling the operation of the motor, and a terminal box provided outside the motor casing, wherein the terminal box comprises a box main body on which electronic components can be mounted, a mounting plate having a mounting surface that is attached to the outer surface of the motor casing, and a connecting leg portion that connects the box main body and the mounting plate, and the connecting leg portion has an area smaller than that of the mounting plate when viewed in a direction perpendicular to the mounting surface.

[0008] An electric motor assembly according to a second aspect of the present invention is the electric motor assembly according to the first aspect, wherein the terminal box has support legs that support the electronic components.

[0009] The electric motor assembly according to a third aspect of the present invention is the electric motor assembly according to the first or second aspect, wherein the mounting plate and the connecting leg are formed of resin and are separate from the box body.

[0010] An electric motor assembly according to aspect 4 of the present invention is an electric motor assembly according to any one of aspects 1 to 3, further comprising a cooling fan fixed to the end of the drive shaft and a fan cover covering the cooling fan, wherein the fan cover has a main plate portion and a peripheral plate portion extending from the periphery of the main plate portion along the drive shaft, and a portion including the tip of the peripheral plate portion is inserted between the mounting plate and the box body.

[0011] An electric motor assembly according to a fifth aspect of the present invention is the electric motor assembly according to any one of the first to fourth aspects, wherein the electronic components include an electronic board capable of digital wireless communication.

[0012] A sixth aspect of the present invention provides an electric motor assembly according to the fifth aspect, wherein at least a portion of the box body is made of resin. [Effects of the Invention]

[0013] One aspect of the present invention provides an electric motor assembly that can suppress the temperature inside a terminal box and can be made compact. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a cross-sectional view of the electric motor assembly according to the first embodiment. [Figure 2] 1 is a view of an electric motor assembly according to a first embodiment as viewed from the axial direction. [Figure 3] FIG. 2 is a plan view of a motor frame of the electric motor assembly according to the first embodiment. [Figure 4] FIG. 2 is a cross-sectional view of a terminal box of the electric motor assembly according to the first embodiment. [Figure 5] FIG. 2 is a plan view of a terminal box portion of the electric motor assembly according to the first embodiment. [Figure 6] FIG. 2 is a cross-sectional view of a terminal box portion of the electric motor assembly according to the first embodiment. [Figure 7] FIG. 10 is an exploded perspective view of a motor frame and a terminal box of an electric motor assembly according to a second embodiment. [Figure 8] FIG. 10 is a cross-sectional view of a terminal box of an electric motor assembly according to a second embodiment. [Figure 9] FIG. 11 is an enlarged cross-sectional view of an electric motor assembly according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0016] FIG. 1 is a cross-sectional view of an electric motor assembly 1 according to a first embodiment. FIG. 1 shows a cross-section taken along line AA in FIG. 2. FIG. 2 is a view of the electric motor assembly 1 as seen from the axial direction. FIG. 3 is a plan view of a motor frame 11. FIG. 4 is a cross-sectional view of a terminal box 40. FIG. 5 is a plan view of a terminal box portion 4. FIG. 6 is a cross-sectional view of the terminal box portion 4.

[0017] [Motor Assembly] (First Embodiment) As shown in Fig. 1, the electric motor assembly 1 includes a motor section 2, an inverter section 3, a terminal box section 4, a drive shaft 5, a cooling fan 6, and a fan cover 7. The electric motor assembly 1 is an electric motor having an integrated structure with an inverter 20 built in.

[0018] The drive shaft 5 is rotated by the motor unit 2. The direction in which the central axis O of the drive shaft 5 extends is the axial direction. The direction perpendicular to the central axis O is the radial direction. The direction away from the central axis O along the radial direction is the radially outward direction. The direction approaching the central axis O along the radial direction is the radially inward direction.

[0019] 1, a rotary machine 100 (such as a pump or a blower) is connected to the right end of the drive shaft 5. The right side in FIG. 1 is the load side. The left side in FIG. 1 is the anti-load side.

[0020] The motor section 2 includes a motor 18 and a motor casing 10. The motor 18 includes a rotor 16 that rotates the drive shaft 5, and a stator 17. The rotor 16 is fixed to the drive shaft 5. The stator 17 surrounds the rotor 16 and forms a rotating magnetic field. The stator 17 includes a stator core and a coil wound around the stator core. The drive shaft 5 rotates together with the rotor 16 due to the rotating magnetic field generated by the stator 17. The motor 18 is a heat source.

[0021] The motor 18 is, for example, a permanent magnet motor that uses a permanent magnet in the rotor. The motor 18 is not limited to a permanent magnet motor, and may be another type of motor, such as an induction motor or an SR motor.

[0022] The motor casing 10 includes a motor frame 11, an end cover 12, and a motor side plate 13. The motor casing 10 has a motor 18 disposed therein.

[0023] The motor frame 11 is formed in a generally cylindrical shape. A stator 17 is fixed to the inner peripheral surface of the motor frame 11. As shown in Fig. 3, the motor frame 11 has an insertion hole 11a through which the wiring 101 (see Fig. 1) is inserted. The insertion hole 11a is a through-hole that penetrates the motor frame 11 in the thickness direction. The insertion hole 11a has, for example, an elliptical shape with a major axis along the Y direction.

[0024] As shown in Figure 1, an end cover 12 closes the open end on the load side of the motor frame 11. An insertion hole 12a through which the drive shaft 5 is inserted is formed in the end cover 12. A bearing 14 supported by the end cover 12 supports the drive shaft 5 so that it can rotate freely. An insertion hole 13a through which the drive shaft 5 is inserted is formed in the motor side plate 13. A bearing 15 supported by the motor side plate 13 rotatably supports the drive shaft 5. The end cover 12 and the motor side plate 13 face each other in the axial direction.

[0025] The inverter unit 3 includes an inverter 20 and a heat sink 21. The inverter 20 controls the operation (rotation speed) of the motor 18. The inverter 20 includes a plurality of heat generating elements (not shown) including elements such as switching elements and capacitors, and a substrate 22 on which these heat generating elements are mounted. The substrate 22 is provided on the inner surface of the heat sink 21 in contact with the heat sink 21. The inverter 20 is a heat source.

[0026] The heat sink 21 has an insertion hole 21a through which the drive shaft 5 is inserted. The heat sink 21 closes the open end of the motor frame 11 on the anti-load side.

[0027] The cooling fan 6 is fixed to the end (the end on the left side in FIG. 1) on the anti-load side of the drive shaft 5. The cooling fan 6 is disposed outside the heat sink 21 (on the anti-load side).

[0028] The fan cover 7 covers the cooling fan 6. The fan cover 7 includes a main plate portion 23 and a peripheral plate portion 24. The main plate portion 23 is disk-shaped. An intake port (not shown) is formed in the main plate portion 23 to draw in external air. The peripheral plate portion 24 is cylindrical. The peripheral plate portion 24 extends from the periphery of the main plate portion 23 along the drive shaft 5 toward the load side (the right side in FIG. 1). The inner diameter of the peripheral plate portion 24 is larger than the outer diameter of the heat sink 21, for example.

[0029] Wiring 101 is electrically connected to the substrate 22 of the inverter 20. The wiring 101 includes, for example, a power line (power cable) for power supply and an electric line (communication cable) for communication. The wiring 101 passes through the insertion hole 11a of the motor frame 11, extends outside the motor frame 11, and reaches the inside of the terminal box 40.

[0030] 5 and 6, the terminal box section 4 includes a terminal box 40, a first electronic board 41, a second electronic board 42, and a third electronic board 43. The terminal box section 4 is provided outside the motor casing 10 (see FIG. 1).

[0031] The posture of the terminal box portion 4 is tentatively defined in accordance with Figure 6. The upper side (radially outer side) in Figure 6 is the upper side. The lower side (radially inner side) in Figure 6 is the lower side. The X direction is parallel to the axial direction. The Y direction is perpendicular to the axial direction. The Z direction is perpendicular to the X and Y directions. The plane defined by the X and Y directions is parallel to the mounting surface 52a. The Z direction is parallel to the radial direction of the drive shaft 5. The Z direction is the height direction.

[0032] As shown in FIGS. 4 and 6, the terminal box 40 includes a box body 51, a connecting portion 57, and supporting legs 54 to 56. The box body 51 includes a bottom plate 58, side plates 59, and a lid (not shown) that closes an upper opening of the box body 51. The bottom plate 58 is, for example, rectangular. The bottom plate 58 is, for example, rectangular having two sides along the X direction and two sides along the Y direction. The bottom plate 58 is, for example, parallel to a plane perpendicular to the radial direction of the drive shaft 5.

[0033] As shown in Fig. 4, an opening 58b is formed in the center of the bottom plate 58. Wiring 101 can be inserted through the opening 58b (see Fig. 6). When viewed from the radial direction (Z direction), the opening 58b overlaps at least a portion of the insertion hole 11a of the motor frame 11 (see Fig. 3). The opening 58b has, for example, a rectangular shape (e.g., a square shape).

[0034] The side plates 59 are erected on the periphery of the bottom plate 58. The space surrounded by the bottom plate 58 and the side plates 59 is an accommodation space 60. The box main body 51 is located at a position spaced radially outward from the outer surface 10a of the motor casing 10 (see FIG. 1). The box main body 51 and the terminal box 40 allow electronic boards 41 to 43 to be mounted in the accommodation space 60.

[0035] It is preferable that at least a portion of the box body 51 is formed from resin. For example, it is desirable that a portion of the box body 51 is formed from resin and another portion is formed from metal. For example, a lid portion (not shown) that closes the top opening of the box body 51 may be formed from resin, and the bottom plate 58 and side plates 59 may be formed from metal. With a box body 51 configured in this manner, the resin lid portion can ensure communication performance of electronic components (e.g., electronic board 43). Furthermore, since the bottom plate 58 and side plates 59 are formed from metal, heat dissipation performance can be improved. The entire box body 51 may be formed from resin. This can improve communication performance of electronic components (e.g., electronic board 43).

[0036] The connecting portion 57 includes a mounting plate 52 and a connecting leg portion 53. In this embodiment, the connecting portion 57 is formed integrally with the box body 51. The mounting plate 52 and the connecting leg portion 53 are formed integrally.

[0037] The mounting plate 52 is, for example, rectangular. The mounting plate 52 is, for example, rectangular with two sides along the X direction and two sides along the Y direction. The mounting plate 52 is, for example, parallel to the bottom plate 58 of the box main body 51. The mounting plate 52 is located opposite the bottom plate 58.

[0038] The mounting plate 52 is spaced radially inward (downward) from the bottom plate 58. The width W2 (dimension in the X direction) of the mounting plate 52 is smaller than the width W1 (dimension in the X direction) of the bottom plate 58. The length (dimension in the Y direction) of the mounting plate 52 is smaller than, for example, the length (dimension in the Y direction) of the bottom plate 58.

[0039] The lower surface of the mounting plate 52 (the surface facing the motor casing 10) is a mounting surface 52a. The mounting plate 52 is attached to the outer surface 10a of the motor casing 10 at the mounting surface 52a (see FIG. 1). The radial direction (Z direction) is a direction perpendicular to the mounting surface 52a.

[0040] The connecting leg 53 connects the mounting plate 52 and the box main body 51. More specifically, the connecting leg 53 is formed from the upper surface of the mounting plate 52 to the lower surface of the bottom plate 58. When viewed from the radial direction (Z direction), the connecting leg 53 has, for example, a rectangular shape. The connecting leg 53 has, for example, a rectangular shape having two sides along the X direction and two sides along the Y direction. The width W3 (dimension in the X direction) of the connecting leg 53 is smaller than the width W2 of the mounting plate 52. The length (dimension in the Y direction) of the connecting leg 53 is smaller than, for example, the length of the mounting plate 52.

[0041] Since the width W3 of the connecting leg 53 is smaller than the width W2 of the mounting plate 52 and the length of the connecting leg 53 is smaller than the length of the mounting plate 52, the area of ​​the connecting leg 53 is smaller than the area of ​​the mounting plate 52 when viewed from the radial direction (Z direction).

[0042] The area of ​​the connecting leg portion 53 is the area excluding the opening 57b. The area of ​​the connecting leg portion 53 is the connection area between the connecting portion 57 and the box body 51. The area of ​​the mounting plate 52 is the area excluding the opening 57b. The area of ​​the mounting plate 52 is usually equal to the area of ​​the mounting surface 52a. The area of ​​the mounting plate 52 is the area to be installed on the motor casing 10.

[0043] An opening 57b is formed in the connecting portion 57. The opening 57b penetrates the connecting portion 57 in the thickness direction (Z direction). The wiring 101 can be inserted through the opening 57b. The opening 57b has, for example, a rectangular shape (e.g., a square shape). The opening 57b has the same shape as the opening 58b formed in the bottom plate 58. The opening 57b coincides with the opening 58b when viewed from the radial direction (Z direction).

[0044] The connecting portion 57 may be made of metal. The connecting portion 57 may also be made of resin.

[0045] 6, the support legs 54 to 56 include a plurality of first support legs 54, a plurality of second support legs 55, and a plurality of third support legs 56. The first support legs 54, the second support legs 55, and the third support legs 56 protrude upward from the inner surface (top surface) of the bottom plate 58. The first support legs 54 support the first electronic board 41. The second support legs 55 support the second electronic board 42. The third support legs 56 support the third electronic board 43.

[0046] The height dimension of the first electronic board 41 (the overall height dimension including the first board 71 and electronic components 72 and 73) is greater than the height dimensions of the second electronic board 42 and the third electronic board 43. Therefore, the first support leg 54 is formed lower than the second support leg 55 and the third support leg 56. This allows the overall height dimensions of the electronic boards 41 to 43, including the support legs 54 to 56, to be the same.

[0047] 5 and 6, the first electronic board 41 includes a first board 71 and electronic components 72 and 73 mounted on the first board 71. The first electronic board 41 is, for example, a noise filter board. The first electronic board 41 is connected to the input side of the inverter 20, for example.

[0048] The second electronic board 42 includes a second board 74 and electronic components 75 and 76 mounted on the second board 74. The second electronic board 42 is, for example, an input / output board (IF board).

[0049] As shown in FIG. 5, the third electronic board 43 includes a third board 77 and electronic components 78 and 79 mounted on the third board 77. The third electronic board 43 is an electronic board capable of digital wireless communication. The digital wireless communication is, for example, BLE communication (BLE: Bluetooth (registered trademark) Low Energy). Note that the digital wireless communication is not limited to BLE communication, and may also be Wi-Fi communication.

[0050] As shown in FIG. 6, the electronic boards 41 to 43 are electrically connected to the board 22 of the inverter 20 via, for example, wiring 101. The electronic boards 41 to 43 are examples of electronic components. In this embodiment, the inverter 20 is provided integrally with the motor unit 2, but the inverter can also be provided partly or entirely within the terminal box 40. In this case, the inverter is an electronic component mounted in the terminal box.

[0051] As shown in FIG. 1, when the cooling fan 6 rotates in conjunction with the rotation of the drive shaft 5, external air is drawn into the fan cover 7 through an inlet (not shown) formed in the main plate portion 23. Some of the air flows radially outward from the cooling fan 6 while cooling the inverter 20. Some of the air flows toward the load side (the right side in FIG. 1) along the inner circumferential surface of the peripheral plate portion 24 of the fan cover 7. Some of the air flows to the outside through a gap between the peripheral plate portion 24 and the motor frame 11.

[0052] Some of the air that has flowed outside the motor frame 11 flows into the gap between the bottom plate 58 and the mounting plate 52 to cool the box body 51. Some of the air that has flowed outside the motor frame 11 flows along the outer surface of the motor casing 10 to the load side (the right side in FIG. 1) to cool the motor section 2.

[0053] [Advantages of the electric motor assembly according to the first embodiment] The terminal box 40 in the electric motor assembly 1 includes a box body 51 on which the electronic boards 41 to 43 are mounted, a mounting plate 52 attached to the motor casing 10, and a connecting leg 53 connecting the box body 51 and the mounting plate 52. The connecting leg 53 has a smaller area than the mounting plate 52 when viewed from the radial direction (Z direction) of the drive shaft 5. This configuration makes it possible to suppress the amount of heat transfer from the mounting plate 52 to the box body 51. Therefore, it is possible to suppress a rise in temperature inside the box body 51 and keep the temperatures of the electronic boards 41 to 43 below an allowable temperature. This makes it possible to maintain good performance of the electronic boards 41 to 43.

[0054] In the motor assembly 1, since the area of ​​the connecting leg portion 53 is small, a gap is formed between the bottom plate 58 and the mounting plate 52. Air from the cooling fan 6 can circulate through this gap, thereby improving the cooling performance of the box body 51.

[0055] Normally, in an electric motor assembly that has a terminal box, the terminal box tends to impede the flow of air around the motor casing, resulting in reduced cooling performance. In contrast, in electric motor assembly 1, connecting leg 53 forms a gap between bottom plate 58 and mounting plate 52, allowing air to circulate through this gap, thereby preventing a decrease in cooling performance.

[0056] The motor assembly 1 has a simple structure, making it possible to reduce the size compared to when a dedicated fan is used to cool the inside of the terminal box 40. The motor assembly 1 has connecting leg portions 53 that have a smaller area than the mounting plate 52, so the connecting portions 57 can be formed low without increasing the amount of heat transfer. This allows the motor assembly 1 to be reduced in size.

[0057] In the electric motor assembly 1, the terminal box 40 has support legs 54 to 56 that support the electronic boards 41 to 43, so that the electronic boards 41 to 43 can be spaced apart from the bottom plate 58 of the terminal box 40, thereby reducing the amount of heat transfer from the box body 51 to the electronic boards 41 to 43.

[0058] The height of the support legs 54 to 56 can be adjusted to match the height of each of the electronic boards 41 to 43, thereby reducing the height of the electronic boards 41 to 43. For example, by forming the first support leg 54, which supports the first electronic board 41 having a larger height, lower than the support legs 55 and 56, the overall height of the electronic boards 41 to 43 can be reduced.

[0059] [Motor Assembly] (Second Embodiment) Fig. 7 is an exploded perspective view of the motor frame 11 and terminal box 240 of the electric motor assembly 201 according to the second embodiment. Fig. 8 is a cross-sectional view of the terminal box 240 of the electric motor assembly 201.

[0060] 7 and 8, in this embodiment, the connecting portion 57 is separate from the box main body 51. The connecting portion 57 is made of resin. By making the connecting portion 57 out of resin, the amount of heat that flows from the motor casing 10 to the box main body 51 can be reduced.

[0061] The width W2 (dimension in the X direction) of the mounting plate 52 is smaller than the width W1 (dimension in the X direction) of the bottom plate 58. The length L2 (dimension in the Y direction) of the mounting plate 52 is smaller than the length L1 (dimension in the Y direction) of the bottom plate 58.

[0062] The width W3 (dimension in the X direction) of the connecting leg 53 is smaller than the width W2 of the mounting plate 52. The length L3 (dimension in the Y direction) of the connecting leg 53 is smaller than the length L2 of the mounting plate 52.

[0063] Since the width W3 of the connecting leg 53 is smaller than the width W2 of the mounting plate 52 and the length L3 of the connecting leg 53 is smaller than the length L2 of the mounting plate 52, the area of ​​the connecting leg 53 is smaller than the area of ​​the mounting plate 52 when viewed from the radial direction (Z direction). An upper surface 53a of the connecting leg portion 53 is placed on an outer surface 58d (lower surface) of the bottom plate 58 (see FIG. 8).

[0064] As shown in FIG. 7, the connecting portion 57 is formed with one or more fixing holes 57c at positions close to the corners of the opening 57b, through which a fixing tool (not shown) is inserted. One or more fixing holes 58c, through which fixing devices (not shown) are inserted, are formed in the bottom plate 58 near the corners of the opening 58b. The fixing devices (not shown) are inserted into the fixing holes 57c, 58c and fixed to the motor frame 11. This allows the box body 51 and the connecting portion 57 to be fixed to the motor frame 11.

[0065] The fixing device is, for example, a fastener having a head portion and a screw shaft extending from the head portion. The fixing structure of the fixing device is not particularly limited. For example, the fixing device may employ a locking structure using recesses and protrusions.

[0066] [Advantages of the electric motor assembly according to the second embodiment] The electric motor assembly 201 has the same effects as the electric motor assembly 1 (see FIG. 1), and in addition, has the following effects. In the electric motor assembly 201, the connecting portion 57 is made of resin. The connecting portion 57 is separate from the box body 51. This reduces the amount of heat that flows from the motor casing 10 to the terminal box 240. This reduces the amount of heat that is transferred from the motor casing 10 to the box body 51. This prevents the temperature inside the box body 51 from rising, and keeps the temperatures of the electronic boards 41 to 43 below an allowable temperature. This allows the performance of the electronic boards 41 to 43 to be maintained at a high level.

[0067] [Motor Assembly] (Third Embodiment) FIG. 9 is an enlarged cross-sectional view of an electric motor assembly 301 according to the third embodiment. As shown in FIG. 9, a portion including the tip 24a (tip in the extending direction) of the peripheral plate portion 24 of the fan cover 307 is inserted between the attachment plate 52 and the box main body 51 (bottom plate 58).

[0068] It is desirable that the outer peripheral surface of the peripheral plate portion 24 is spaced apart from the underside of the bottom plate 58. When the peripheral plate portion 24 and the bottom plate 58 are spaced apart, air can circulate through the gap between the peripheral plate portion 24 and the bottom plate 58, making it easier for the box body 51 to be cooled.

[0069] In the motor assembly 301, the portion including the tip 24a of the peripheral plate portion 24 is inserted between the mounting plate 52 and the box body 51 (bottom plate 58), so that the air from the cooling fan 6 can come into contact with the connecting portion 57. This further improves the cooling performance.

[0070] While preferred embodiments of the present invention have been described and illustrated, it should be understood that they are illustrative of the invention and are not to be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the invention. [Explanation of symbols]

[0071] 1,201,301...motor assembly, 5...drive shaft, 6...cooling fan, 7,307...fan cover, 10...motor casing, 18...motor, 20...inverter, 23...main plate portion, 24...circumferential plate portion, 24a...tip, 40,240...terminal box, 51...box body, 52...mounting plate, 52a...mounting surface, 53...connecting leg portion, 54...first support leg portion (support leg portion), 55...second support leg portion (support leg portion), 56...third support leg portion (support leg portion).

Claims

1. A drive shaft; a motor that rotates the drive shaft; a motor casing in which the motor is disposed; an inverter for controlling the operation of the motor; a terminal box provided outside the motor casing, The terminal box includes a box body capable of mounting electronic components; a mounting plate having a mounting surface that is attached to the outer surface of the motor casing; a connecting leg portion that connects the box body and the mounting plate, the connecting leg portion has an area smaller than that of the mounting plate when viewed in a direction perpendicular to the mounting surface; Electric motor assembly.

2. The terminal box has support legs that support the electronic components.

2. The electric motor assembly of claim 1.

3. The mounting plate and the connecting leg portion are formed of resin and are separate from the box body.

2. The electric motor assembly of claim 1.

4. The cooling fan is fixed to an end of the drive shaft, and a fan cover covers the cooling fan. the fan cover has a main plate portion and a peripheral plate portion extending from a peripheral edge of the main plate portion along the drive shaft, A portion including a tip of the peripheral plate portion is inserted between the mounting plate and the box body.

2. The electric motor assembly of claim 1.

5. The electronic component includes an electronic board capable of digital wireless communication.

2. The electric motor assembly of claim 1.

6. At least a portion of the box body is made of resin.

6. The electric motor assembly of claim 5.

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