WO2019142777A1

WO2019142777A1 - Heat dissipation member and motor assembly

Info

Publication number: WO2019142777A1
Application number: PCT/JP2019/000902
Authority: WO
Inventors: 和馬西村; 洋平大石; 孝英小澤; 章裕落合; 拡海田村
Original assignee: 株式会社荏原製作所
Priority date: 2018-01-17
Filing date: 2019-01-15
Publication date: 2019-07-25
Also published as: JP2019126188A

Abstract

The present invention relates to a heat dissipation member and a motor assembly. A heat dissipation member (60) comprises: a heat dissipation cover (61) which can be disposed between an inverter case (21) for housing an inverter (20) and a motor casing (10) for housing a motor (8) that comprises a rotor (6) for rotating a drive shaft (5) and a stator (7), and which can connect to the inverter case (21) and the motor casing (10); and a heat dissipation plate (62) which is connected to the inner surface of the heat dissipation cover (61) and can partition an inverter space (66) where the inverter (20) is disposed and a fan space (67) where an internal fan (65) fixed to the drive shaft (5) is disposed. The heat dissipation plate (62) includes an air hole (70) where an airflow caused by the internal fan (65) can be formed between the inverter space (66) and the fan space (67).

Description

Heat dissipation member and motor assembly

The present invention relates to a heat dissipating member and a motor assembly.

A motor assembly comprising an inverter unit and a motor unit is known. In such a motor assembly, the inverter unit includes an inverter and an inverter case accommodating the inverter. The motor unit includes a motor having a rotor and a stator for rotating a drive shaft, and a motor casing for housing the motor.

Since the inverter and the motor are heat sources, when the motor assembly is operated, the heat of the inverter is transferred to the inverter case, and the inverter case becomes hot. Similarly, the heat of the motor is transferred to the motor casing and the motor casing becomes hot. As a result, the motor assembly as a whole becomes very hot. Thus, the motor assembly comprises a fan fixed to the drive shaft and located outside the inverter case and the motor casing. The fan rotates with the rotation of the drive shaft to cool the outer surface of the inverter case and the outer surface of the motor casing. The inverter is indirectly cooled via the cooled inverter case, and the motor is indirectly cooled via the cooled motor casing.

Unexamined-Japanese-Patent No. 8-275483 JP-A-8-289505

However, although the fan can send air to the outer surface of the inverter case and the outer surface of the motor casing by its rotation, it can not send air to the space in which the inverter as the heat source is disposed, ie, the inner space of the inverter case. Can not. Therefore, the internal space of the inverter case is not sufficiently cooled. As a result, this interior space can be very hot.

Since the components of the inverter are greatly influenced depending on the temperature of the internal space of the inverter case, if the internal space of the inverter case is high temperature, the components of the inverter may be damaged or the lifetime of the components of the inverter may be May be shortened. Therefore, it is important to lower the temperature of the internal space of the inverter case.

Then, this invention aims at providing the motor assembly provided with the thermal radiation member which can cool an inverter by cooling the space in which the inverter was arrange | positioned, and this thermal radiation member.

One aspect can be disposed between an inverter case housing an inverter and a motor casing containing a motor having a rotor for rotating a drive shaft and a stator, and can be connected to the inverter case and the motor casing A heat dissipating cover, and a heat dissipating plate capable of dividing an inverter space connected to the inner surface of the heat dissipating cover and in which the inverter is disposed and a fan space in which the internal fan fixed to the drive shaft is disposed; The heat dissipating plate is a heat dissipating member characterized by including an air hole which can be formed between the inverter space and the fan space by the flow of air from the internal fan.

In a preferable aspect, the heat dissipation plate includes an outer peripheral side portion positioned outside the internal fan and an inner peripheral side portion positioned inside the outer peripheral side portion, and the air hole is formed by the outer peripheral side portion An outer peripheral side hole formed in the above and an inner peripheral side hole formed in the inner peripheral side portion are characterized.
In a preferred aspect, the outer circumferential side hole has a size through which a power line connecting the inverter and the motor can pass.
A preferable aspect is characterized in that a passage hole having a size through which a power line connecting the inverter and the motor can pass is formed at the outer peripheral side portion.

In a preferred aspect, the heat dissipation plate includes an outer peripheral side located outside the internal fan, and an inner peripheral side located inside the outer peripheral side, and the air hole is formed on the inner peripheral side. A slit is provided extending from a portion toward the outer peripheral portion.
A preferable aspect is characterized in that a passage hole having a size through which a power line connecting the inverter and the motor can pass is formed at the outer peripheral side portion.

Another aspect is a motor including a drive shaft, a rotor and a stator for rotating the drive shaft, a motor casing for accommodating the motor, an inverter disposed adjacent to the motor, the inverter, and A power line connecting the motor, an inverter case which accommodates the inverter and is arranged in series in the motor casing along an axial direction of the drive shaft, an internal fan fixed to the drive shaft, and A heat dissipation member disposed between the inverter case and the motor casing, the heat dissipation member being connected to the heat dissipation cover connected to the inverter case and the motor casing, and the inner surface of the heat dissipation cover, the inverter And a heat dissipation plate for partitioning the inverter space in which the internal fan is disposed and the fan space in which the internal fan is disposed. Eteori, the heat radiating plate, it is an electric motor assembly characterized by the flow of air by the internal fan with a formable air holes between the inverter space and the fan space.

In a preferable aspect, the heat dissipation plate includes an outer peripheral side portion positioned outside the internal fan and an inner peripheral side portion positioned inside the outer peripheral side portion, and the air hole is formed by the outer peripheral side portion An outer peripheral side hole formed in the above and an inner peripheral side hole formed in the inner peripheral side portion are characterized.
In a preferred aspect, the outer circumferential side hole has a size through which the power line can pass.
In a preferred aspect, the outer circumferential side portion is formed with a passage hole having a size through which the power line can pass.

In a preferred aspect, the heat dissipation plate includes an outer peripheral side located outside the internal fan, and an inner peripheral side located inside the outer peripheral side, and the air hole is formed on the inner peripheral side. A slit is provided extending from a portion toward the outer peripheral portion.
In a preferred aspect, the outer circumferential side portion is formed with a passage hole having a size through which the power line can pass.

The heat dissipating member includes the heat dissipating cover and the heat dissipating plate, so that the heat of the inverter space warmed by the inverter can be actively released to the outside of the heat dissipating cover. As a result, the heat dissipation member can cool the inverter.

FIG. 2 is a cross-sectional view of one embodiment of a motor assembly. It is a front view of a heat radiating member when a heat radiating member is seen from the motor part side. It is a figure which shows the several fin extended toward an inner side from the inner surface of a thermal radiation cover. It is a figure which shows the flow of the air by rotation of an internal fan. It is a figure which shows the relationship between the diameter of a power wire and the clearance gap of an outer peripheral side hole, and the relationship between the diameter of an internal fan, and the diameter of the circle | round | yen formed by the outer peripheral side hole. It is a figure which shows the through-hole formed in the outer peripheral side site | part. FIG. 7 is a view showing another embodiment of the air hole. FIG. 7 is a view showing still another embodiment of the air hole. FIG. 7 shows another embodiment of a motor assembly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings to be described below, the same or corresponding components are denoted by the same reference numerals and redundant description will be omitted. In the embodiments to be described below, the configuration of one embodiment that is not particularly described is the same as the other embodiments, and thus the description thereof will not be repeated.

FIG. 1 is a cross-sectional view showing an embodiment of a motor assembly 1. A motor assembly 1 shown in FIG. 1 is a mechanical device having an integrated structure in which an inverter 20 described later is built in and disposed on land. As shown in FIG. 1, the motor assembly 1 includes a motor unit 2 and an inverter unit 3. The motor assembly 1 includes a drive shaft 5, a motor (rotating element) 8 including a rotor 6 for rotating the drive shaft 5 and a stator 7, and a motor casing 10 for housing the motor 8. The inverter 20 is disposed adjacent to the motor 8 and accommodates the inverter 20 for controlling the operation (rotational speed) of the motor 8 and the inverter 20, and is disposed in series in the motor casing 10 along the direction of the axis CL of the drive shaft 5 An inverter case 21 is provided.

The drive shaft 5 extends through the motor casing 10 and the inverter case 21, and the motor casing 10 and the inverter case 21 are arranged concentrically with the drive shaft 5. In the present embodiment, since the motor casing 10 and the inverter case 21 are arranged in series in the direction of the axis line CL of the drive shaft 5, the motor assembly 1 can have a compact structure. An external fan 25 concentrically disposed with the drive shaft 5 is fixed to an end of the drive shaft 5 (that is, the opposite load side of the drive shaft 5). The external fan 25 is adjacent to the inverter case 21 at a position outside the inverter case 21.

Inside the motor casing 10, a motor 8 which is a heat source is disposed. A motor 8 includes a rotor 6 fixed to a drive shaft 5 and a stator (a stator (stator) that surrounds the rotor 6 and receives electric power from the outside (not shown) from a winding (coil) 7b. ) And 7). The stator 7 includes a stator core 7a and a plurality of windings 7b wound around the stator core 7a. The rotor 6 is rotated by a rotating magnetic field formed between the rotor 6 and the stator 7, and the drive shaft 5 to which the rotor 6 is fixed rotates with the rotor 6.

In FIG. 1, the motor 8 is schematically depicted. The motor 8 is, for example, a permanent magnet type motor using a permanent magnet as a rotor. However, the motor 8 is not limited to a permanent magnet type motor, and may be various types of motors such as an induction motor and an SR motor.

The motor casing 10 has a cylindrical motor frame 11 to which the stator 7 is fixed, and an end cover 12 in which one open end of the motor frame 11 is closed and a through hole 30 through which the drive shaft 5 passes is formed. The other open end of the motor frame 11 is closed, and a bracket 13 having a through hole 31 through which the drive shaft 5 passes is formed. The end cover 12 and the bracket 13 face each other with the motor 8 interposed therebetween. The drive shaft 5 is rotatably supported by a bearing 27 supported by the bearing support portion 32 of the end cover 12 and a bearing 28 supported by the bearing support portion 33 of the bracket 13.

A plurality of fins 35 extending in the direction of the axis line CL of the drive shaft 5 are disposed on the outer surface of the motor frame 11. The fins 35 extend outward from the outer surface of the motor frame 11 and are arranged at equal intervals along the circumferential direction of the motor frame 11. The outer surface of the motor frame 11 is a surface opposite to the inner surface of the motor frame 11 to which the stator 7 is fixed.

The inverter case 21 includes a cylindrical inverter frame 22 surrounding the inverter 20 and a cover member 23 closing the open end of the inverter frame 22. A plurality of fins 37 extending in the direction of the axis line CL of the drive shaft 5 are disposed on the outer surface of the inverter frame 22. The fins 37 extend outward from the outer surface of the inverter frame 22 and are arranged at equal intervals along the circumferential direction of the inverter frame 22. The outer surface of the inverter frame 22 is a surface opposite to the inner surface of the inverter frame 22 disposed around the inverter 20.

The surface 21c on the cover member 23 side of the inverter frame 22 and the surface 21d on the inverter frame 22 side of the cover member 23 have a fitting structure, and the inverter frame 22 and the cover member 23 are mutually connected by fitting. It is done. A plurality of fins 36 are formed on the outer surface of the cover member 23. The fins 36 are adjacent to the outer fan 25 and extend from the outer surface of the cover member 23 toward the outer fan 25.

The cover member 23 of the inverter case 21 is disposed concentrically with the drive shaft 5, and a through hole 40 through which the drive shaft 5 passes is formed at the center of the cover member 23. The drive shaft 5 extends to the outside of the inverter unit 3 through the through hole 40.

An inverter 20 is disposed inside the inverter case 21. The inverter 20 includes an inverter element 41 including elements such as a switching element and a capacitor, and a substrate 42 on which the inverter element 41 is mounted. The substrate 42 is fixed to the inner surface of the cover member 23 via the spacer 43. The inner surface of the cover member 23 is a surface opposite to the outer surface of the cover member 23. The cover member 23 has a saucer shape on which the substrate 42 is placed. With such a structure, the cover member 23 can be filled with a resin for heat dissipation and surface protection of the substrate 42.

The inverter case 21 (in particular, the cover member 23 and the fins 36) plays a role as a heat sink of the inverter unit 3, and therefore, it has excellent heat conductivity such as a material (for example, aluminum (Al)) having relatively high heat dissipation performance. It is basically made of metal). In the present embodiment, the inverter frame 22 has a cylindrical shape in conformity with the outer shape of the motor frame 11. In one embodiment, when the motor casing 10 has a special external shape by a member such as a fin or a terminal box, the inverter case 21 may have a structure matched to the shape of the motor casing 10.

The inverter 20 is provided with a power line 45 for power supply and an electric line 46 for communication. In FIG. 1, the power line 45 and the electric line 46 are schematically drawn by thick lines. The power line 45 is a line that outputs power from the substrate 42 to the motor 8, and the electric line 46 includes a communication line connected to an apparatus such as a controller. The electrical wire 46 may be a plurality of wires including input wires and communication wires, or may be a single wire. The electric wire 46 is connected to a terminal box provided in the external space of the motor assembly 1 through a hole (not shown) formed in the inverter case 21. A hole through which the electrical wire 46 passes is closed by a sealing member in order to prevent contact of the air 20 with moisture and / or liquid such as rain to the inverter 20.

The motor assembly 1 further includes a shaft cover 50 covering the periphery of the drive shaft 5. The shaft cover 50 is an isolation member that isolates the drive shaft 5 and the inverter 20. The shaft cover 50 has a cylindrical shape and is disposed concentrically with the drive shaft 5. The shape of the shaft cover 50 is not particularly limited. The shaft cover 50 extends in the direction of the axis line CL of the drive shaft 5. The inverter 20 (i.e., the inverter element 41 and the substrate 42), the power line 45, and the electric line 46 are disposed outside the shaft cover 50. The substrate 42 has an annular shape through which the drive shaft 5 and the shaft cover 50 pass, and the substrate 42 and the shaft cover 50 are arranged concentrically with the drive shaft 5. The power line 45 and the electric line 46 are disposed in the space between the inverter frame 22 and the shaft cover 50. By providing the shaft cover 50, it is possible to prevent the winding of the power line 45 and the electric wire 46 to the drive shaft 5 and the contact of the inverter element 41 with the drive shaft 5. As a result, failure of inverter 20 can be reliably prevented.

A fan cover 51 is attached to the cover member 23 so as to surround the external fan 25. The fan cover 51 is a member for guiding cooling air to the motor unit 2 side and the inverter unit 3 side. The fan cover 51 is disposed to cover the cover member 23. The fan cover 51 has an opening 51 a formed in the surface of the fan cover 51 facing the external fan 25.

When the external fan 25 rotates with the drive shaft 5, air is sent to the inverter case 21 and the motor casing 10 through the opening 51a. The air contacts the inverter case 21, the motor casing 10, the

fins

35, 36, 37 and the fins 38 formed on the outer surface of the heat dissipation cover 61 of the heat dissipation member 60 described later to remove heat from the inverter 20 and the motor 8. .

The external fan 25 can send air to the outer surface of the inverter case 21 and the outer surface of the motor casing 10 by its rotation, but can not send air to the space where the inverter 20 serving as the heat source is disposed. As described above, if the temperature around the inverter element 41 which is a component of the inverter 20 is high, the inverter element 41 may be damaged or the life of the inverter element 41 (in particular, the capacitor) may be shortened. In the present embodiment, the motor assembly 1 can sufficiently cool the space in which the inverter 20 is disposed. Hereinafter, the structure which can fully cool the space where inverter 20 is arranged, and can cool inverter 20 is explained, referring to drawings.

FIG. 2 is a front view of the heat radiating member 60 when the heat radiating member 60 is viewed from the motor unit 2 side. The motor assembly 1 includes a heat dissipation member 60 disposed between the inverter case 21 and the motor casing 10. The heat dissipation member 60 is connected to the heat dissipation cover 61 connected to the inverter case 21 (more specifically, the inverter frame 22) and the motor casing 10 (more specifically, the bracket 13), and to the inner surface 61a of the heat dissipation cover 61 , And the heat dissipation plate 62 which divides the inverter space 66 in which the inverter 20 is arrange | positioned, and the fan space 67 in which the internal fan 65 is arrange | positioned. The inverter 20 is disposed in a sealed space formed by the inverter case 21, the heat dissipation cover 61, and the bracket 13 of the motor casing 10. The shaft cover 50 is connected to the cover member 23 and the heat dissipation plate 62. The heat dissipation plate 62 extends perpendicularly to the direction of the axis line CL of the drive shaft 5.

As shown in FIG. 1, the surface 61 b on the bracket 13 side of the heat dissipation cover 61 and the surface 10 d on the heat dissipation cover 61 side of the bracket 13 have a fitting structure, and the heat dissipation cover 61 and the bracket 13 are fitted They are connected to each other by their mates. The surface 61 c on the inverter frame 22 side of the heat radiation cover 61 is connected (fixed) to the surface 21 e on the heat radiation cover 61 side of the inverter frame 22.

In one embodiment, the surface (surface on the side of the inverter frame 22) 61c of the heat dissipation cover 61 and the surface (surface on the side of the heat dissipation cover 61) 21e of the inverter frame 22 have fitting structures, respectively. And the inverter frame 22 may be connected to each other by fitting. In another embodiment, the bracket 13 and the cover member 23 may be fastened by a fastener such as a through bolt in a state where the heat dissipation cover 61 and the inverter frame 22 are in close contact with each other. In still another embodiment, the heat dissipating cover 61 and the inverter frame 22 may be connected to each other by fixing means such as welding.

The internal fan 65 is disposed between the heat dissipation plate 62 and the bracket 13 and is fixed to the drive shaft 5 (see FIG. 1). The internal fan 65 includes a boss portion 65a fixed to the drive shaft 5, and a plurality of wings 65b fixed to the boss portion 65a and arranged at equal intervals along the circumferential direction of the boss portion 65a (see FIG. 2).

In the present embodiment, the internal fan 65 is a centrifugal fan, but the structure of the internal fan 65 is not particularly limited. If it is preferable to form a flow of air along the direction of the axis line CL of the drive shaft 5 by changing the elements including the inverter case 21 and the substrate 42, change the inclination of the wing 65b of the internal fan 65, etc. The shape of may be changed. In one embodiment, the internal fan 65 may be an axial fan. In the present embodiment, nine wings 65b are provided, but the number of wings 65b may be changed as long as the motor efficiency is not affected. Since the internal fan 65 rotates with the rotation of the drive shaft 5, no special power supply for rotating the internal fan 65 is required.

Although a single internal fan 65 is provided in this embodiment, the number of internal fans 65 is not limited to this embodiment. Multiple internal fans 65 may be provided. Further, the internal fan 65 may be a combination of an axial fan and a centrifugal fan. In this case, the axial flow fan may be disposed on the heat radiation plate 62 side, and the centrifugal fan may be disposed on the bracket 13 side. Conversely, the centrifugal fan may be disposed on the heat dissipating plate 62 side, and the axial flow fan may be disposed on the bracket 13 side.

As shown in FIG. 2, the outer surface 61 d of the heat radiation cover 61 is formed with a plurality of fins 38 extending outward from the outer surface 61 d. In the present embodiment, the fins 38 are disposed on the entire outer surface 61 d of the heat dissipating cover 61. In one embodiment, these fins 38 may be disposed on a part of the outer surface 61 d of the heat dissipating cover 61. In another embodiment, the heat dissipating cover 61 may include not only the fins 38 formed on the outer surface 61 d of the heat dissipating cover 61 but also a plurality of fins 39 formed on the inner surface 61 a of the heat dissipating cover 61.

FIG. 3 is a view showing a plurality of fins 39 extending inward from the inner surface 61 a of the heat dissipation cover 61. As shown in FIG. 3, by providing the

fins

38 and 39 on both the outer surface 61 d and the inner surface 61 a of the heat dissipating cover 61, the surface area of the heat dissipating cover 61 can be further increased.

As shown in FIG. 2, the heat dissipation plate 62 is provided with an air hole 70 which allows the flow of air due to the rotation of the internal fan 65 to be formed between the inverter space 66 and the fan space 67. The air holes 70 open on both sides of the heat dissipation plate 62, and the inverter space 66 and the fan space 67 communicate with each other through the air holes 70. In the present embodiment, the heat dissipating plate 62 is located outside the internal fan 65 and is located on the inner peripheral side located on the outer peripheral side portion (outside portion) 71 adjacent to the inner surface 61 a of the heat dissipating cover 61 A site (inner site) 72 is provided. A through hole 72 a (see FIG. 1) through which the drive shaft 5 passes is formed in the inner circumferential side portion 72, and the heat dissipation plate 62 is disposed concentrically with the drive shaft 5. The air hole 70 includes an outer peripheral hole (outer hole) 75 formed in the outer peripheral portion 71 and an inner peripheral hole (inner hole) 76 formed in the inner peripheral portion 72. . In the present embodiment, the outer peripheral side holes 75 are a plurality of (three) openings, and the plurality of outer peripheral side holes 75 are arranged at equal intervals along the circumferential direction of the heat dissipation cover 61. In one embodiment, the number of outer peripheral holes 75 may be at least one.

Similarly, in the present embodiment, the inner circumferential side holes 76 are a plurality of (three) openings, and the plurality of inner circumferential side holes 76 are arranged at equal intervals along the circumferential direction of the heat dissipation cover 61 ing. In one embodiment, the number of inner holes 76 may be at least one. The three inner peripheral holes 76 are disposed at positions facing the internal fan 65.

The inverter space 66 and the fan space 67 communicate with each other by the outer peripheral side hole 75 and the inner peripheral side hole 76, and the air can move in the inverter space 66 and the fan space 67.

FIG. 4 is a view showing the flow of air as the internal fan 65 rotates. In FIG. 4, the illustration of the power line 45 and the electric line 46 is omitted. As shown in FIG. 4, when the internal fan 65 rotates, the air in the inverter space 66 flows into the fan space 67 through the inner circumferential hole 76. Thereafter, the air flowing into the fan space 67 collides with the surface 10 d of the bracket 13 and the air flow direction is changed. The air in the fan space 67 flows toward the heat dissipation cover 61 and collides with the inner surface 61 a of the heat dissipation cover 61. The flow direction of the air is further changed, and the air flows from the fan space 67 to the inverter space 66 through the outer peripheral hole 75. Thus, the air circulates through the inverter space 66 and the fan space 67 by the rotation of the internal fan 65, that is, a circulating flow of air is formed in the inverter space 66 and the fan space 67 and is warmed by the heat of the inverter 20. The air is stirred.

The temperature of the air in the vicinity of the inverter 20 tends to rise by the heat of the inverter 20, and the temperature of the air in the vicinity of the motor 8, particularly in the vicinity of the winding 7b of the stator 7 tends to rise by the heat of the winding 7b. On the other hand, the temperature of air at a distance from the inverter 20 and the motor 8 tends to be low. The heat dissipation member 60 is disposed between the inverter case 21 and the motor casing 10 and is disposed at a position separated from the inverter 20 and the motor 8. Therefore, since the fan space 67 in which the internal fan 65 is disposed is separated from the inverter 20, the temperature of the fan space 67 is lower than the temperature of the inverter space 66. When the circulating flow of air is formed in the inverter space 66 and the fan space 67 by the rotation of the internal fan 65, the air in the inverter space 66 warmed by the heat of the inverter 20 is cooled, and the temperature of the air in these inverter spaces 66 And the temperature of the air in the fan space 67 becomes uniform. As a result, the inverter 20 is cooled.

The heat dissipating member 60 constitutes a part of the casing of the motor assembly 1 and extends from the heat dissipating cover 61 toward the inside of the motor assembly 1 from the heat dissipating cover 61 in contact with the air in the space outside the motor assembly 1. A heat dissipation plate 62 is provided. When the internal fan 65 forms a circulating flow of air, the flowing air contacts the heat dissipation plate 62 and the heat of the inverter space 66 warmed by the inverter 20 is actively released to the outside of the heat dissipation cover 61. The heat dissipating plate 62 plays the role of a fin for increasing the surface area of the heat dissipating cover 61. The heated air flowing by the rotation of the internal fan 65 comes in contact with the heat dissipation plate 62, and the heat of this air is transmitted to the heat dissipation plate 62 and the heat dissipation cover 61 and released to the outside of the motor assembly 1 (FIG. 4). See dotted arrow). Furthermore, the air outside the motor assembly 1 that flows due to the rotation of the external fan 25 can contact the heat dissipation cover 61 and the fins 38 to take away the heat of the inverter 20. The material of the heat radiation plate 62 is not particularly limited, but a material having a high thermal conductivity (for example, copper or aluminum) is preferable. Similarly, the heat dissipating cover 61 may be made of a material having a high thermal conductivity. Since the heat dissipating member 60 includes the heat dissipating cover 61 and the heat dissipating plate 62, the heat of the inverter space 66 warmed by the inverter 20 can be actively dissipated to the outside of the heat dissipating cover 61. As a result, the heat dissipation member 60 can cool the inverter 20.

A power line 45 and an electric line 46 are disposed inside the motor assembly 1 (see FIG. 1). The power line 45 and the electric line 46 have a length long enough to allow an operator to remove the cover member 23 and check (visualize) the inverter 20. If the power line 45 and the electric line 46 contact the internal fan 65, the power line 45 and / or the electric line 46 may be disconnected or the inverter 20 may be broken. Therefore, in the present embodiment, the power line 45 is connected to the winding 7b of the stator 7 through the outer peripheral side hole 75 and the through hole 80 (see FIG. 1) of the bracket 13. Since the size of the inner circumferential hole 76 is smaller than the size (thickness) of the electric wire 46, the electric wire 46 passes through the inner circumferential hole 76 even if the length of the electric wire 46 is long. It is not exposed to the fan space 67. Therefore, the inner circumferential side hole 76 can prevent the electric wire 46 from contacting the internal fan 65.

FIG. 5 is a view showing the relationship between the diameter of the power line 45 and the clearance of the outer peripheral hole 75 and the relationship between the diameter of the internal fan 65 and the diameter of the circle formed by the outer peripheral hole 75. As shown in FIG. 5, the outer peripheral side hole 75 has a size through which the power line 45 can pass. The gap between the outer peripheral side holes 75, that is, the distance B is larger than the diameter A of the power line 45 (B> A). Furthermore, the diameter C of the circle formed by the outer peripheral side hole 75 is larger than the diameter D of the internal fan 65 (C> D). Therefore, the power line 45 passing through the outer peripheral side hole 75 does not contact the internal fan 65. Since the diameter A of the power line 45 is larger than the gap of the inner hole 76, ie, the distance E (A> E), the power line 45 does not pass through the inner hole 76. Although not shown, since the diameter of the electric wire 46 is also larger than the distance E, the electric wire 46 also does not pass through the inner circumferential hole 76.

FIG. 6 is a view showing the passage hole 80 formed in the outer peripheral side portion 71. As shown in FIG. In FIG. 5, the power line 45 passes through the outer circumferential side hole 75, but as shown in FIG. 6, the outer circumferential side portion 71 of the heat dissipating plate 62 is a passing hole having a size through which the power line 45 can pass. It may have 80. In FIG. 6, one of the three outer peripheral holes 75 is divided, and the passage hole 80 is formed between the divided outer peripheral holes 75. In one embodiment, as long as the passage hole 80 is located outside the internal fan 65, the location is not particularly limited.

The air holes 70 in the embodiment shown in FIG. 2 have a shape that does not inhibit the flow of air from the inverter space 66 to the fan space 67 and the flow of air from the fan space 67 to the inverter space 66. The shape of the air hole 70 is not limited to the embodiment shown in FIG. 2 as long as the circulating flow of air is not impeded. FIG. 7 is a view showing another embodiment of the air hole 70. As shown in FIG.

As shown in FIG. 7, the air hole 70 is provided with a slit 90 extending from the inner circumferential side portion 72 of the heat dissipation plate 62 toward the outer circumferential side portion 71. In the present embodiment, thirty slits 90 are provided, but the number of slits 90 is not limited to this embodiment. At least one slit 90 may be provided. The plurality of slits 90 extend radially, and a passage hole 80 is formed between two slits 90 adjacent to each other. The number, the arrangement, and the shape of the slits 90 are not particularly limited as long as the passage holes 80 can be formed in the outer peripheral side portion 71 of the heat dissipation plate 62. In FIG. 7, the internal fan 65 is an axial fan, but may be a centrifugal fan. The heat dissipating cover 61 may include not only the fins 38 formed on the outer surface 61 d of the heat dissipating cover 61 but also a plurality of fins 39 formed on the inner surface 61 a of the heat dissipating cover 61 (see FIG. 3).

FIG. 8 is a view showing another embodiment of the air hole 70. As shown in FIG. As shown in FIG. 8, one of the plurality of slits 90 has a length shorter than the other slits 90, and the passage hole 80 is disposed outside the slit 90 having this short length. ing. The number, the arrangement, and the shape of the slits 90 are not particularly limited as long as the passage holes 80 can be formed in the outer peripheral side portion 71 of the heat dissipation plate 62. Although not shown, the air holes 70 may be innumerable holes arranged regularly or randomly in the heat dissipation plate 62. Even in the embodiment shown in FIG. 8, a plurality of fins 39 may be formed on the inner surface 61 a of the heat dissipation cover 61 (see FIG. 3).

FIG. 9 is a view showing another embodiment of the motor assembly 1. In FIG. 9, the configuration of the embodiment that is not particularly described is the same as the configuration of the embodiment described above, and thus the description thereof will not be repeated. As shown in FIG. 9, the drive shaft 5 does not penetrate the heat dissipation plate 62 and the cover member 23, and an internal fan 65 is fixed to an end of the drive shaft 5. Even with such a configuration, since the motor assembly 1 includes the heat dissipation member 60, the inverter space 66 can be cooled by the flow of air due to the rotation of the internal fan 65 and the heat dissipation effect of the heat dissipation member 60.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and, of course, may be implemented in various different forms within the scope of the technical idea thereof.

The present invention is applicable to a heat dissipating member and a motor assembly.

Reference Signs List 1 motor assembly 2 motor unit 3 inverter unit 5 drive shaft 6 rotor 7 stator 7 a stator core 7 b winding 8 motor 10 motor casing 10 d surface 11 on the heat radiation cover side motor frame 12 end cover 13 bracket 20 inverter 21 inverter case 21 c cover Member side surface 21d Surface 21e on the inverter frame side Surface 22 on the heat radiation cover side Inverter frame 23 Cover member 25

External fan

27, 28

Bearing

30, 31 Through hole 33

Bearing support

35, 36, 37, 38, 39 Fin 40 Hole 41 Inverter element 42 Substrate 43 Spacer 45 Power wire 46 Electric wire 50 Shaft cover 51 Fan cover 51a Opening 60 Heat dissipation member 61 Heat dissipation cover 61a Inner surface 61b Bracket side surface 61 The surface 61 d on the side of the inverter frame The outer surface 62 The heat dissipation plate 65 The internal fan 65 a The boss 65 b The wing 66 The inverter space 67 The fan space 70 The air hole 71 The outer side portion 72 The inner peripheral side portion 72 a The through hole 75 The outer peripheral side hole 76 The inner peripheral side hole 80 through holes 90 slits

Claims

A heat dissipating cover which can be disposed between an inverter case housing the inverter and a motor casing containing a motor having a rotor rotating the drive shaft and a stator, and which can be connected to the inverter case and the motor casing ,
The heat dissipating plate is provided with a heat dissipating plate capable of dividing an inverter space connected to the inner surface of the heat dissipating cover and in which the inverter is disposed and a fan space in which the internal fan fixed to the drive shaft is disposed.
The heat dissipating member according to claim 1, wherein the heat dissipating plate comprises an air hole through which the flow of air from the internal fan can be formed between the inverter space and the fan space.
The heat dissipation plate is
An outer circumferential portion located outside the internal fan;
And an inner circumferential side located inside the outer circumferential side,
The air holes are
An outer peripheral hole formed in the outer peripheral portion;
The heat dissipating member according to claim 1, further comprising: an inner circumferential hole formed in the inner circumferential portion.
The heat dissipation member according to claim 2, wherein the outer circumferential side hole has a size through which a power line connecting the inverter and the motor can pass.
The heat dissipation member according to claim 2, wherein a passage hole having a size through which a power line connecting the inverter and the motor can pass is formed at the outer circumferential side portion.
The heat dissipation plate is
An outer circumferential portion located outside the internal fan;
And an inner circumferential side located inside the outer circumferential side,
The heat dissipation member according to claim 1, wherein the air hole includes a slit extending from the inner circumferential portion toward the outer circumferential portion.
The heat dissipation member according to claim 5, wherein a passage hole having a size through which a power line connecting the inverter and the motor can pass is formed at the outer circumferential side portion.
Drive shaft,
A motor comprising a rotor and a stator for rotating the drive shaft;
A motor casing for housing the motor;
An inverter disposed adjacent to the motor;
A power line connecting the inverter and the motor;
An inverter case that accommodates the inverter and is disposed in series in the motor casing along the axial direction of the drive shaft;
An internal fan fixed to the drive shaft,
A heat dissipation member disposed between the inverter case and the motor casing;
The heat dissipation member is
A heat dissipation cover connected to the inverter case and the motor casing;
The heat dissipation cover further includes a heat dissipation plate connected to an inner surface of the heat dissipation cover and partitioning an inverter space in which the inverter is disposed and a fan space in which the internal fan is disposed.
The motor assembly according to claim 1, wherein the heat dissipating plate comprises an air hole through which the flow of air from the internal fan can be formed between the inverter space and the fan space.
The heat dissipation plate is
An outer circumferential portion located outside the internal fan;
And an inner circumferential side located inside the outer circumferential side,
The air holes are
An outer peripheral hole formed in the outer peripheral portion;
8. The motor assembly according to claim 7, further comprising: an inner circumferential hole formed in the inner circumferential portion.
The motor assembly according to claim 8, wherein the outer circumferential side hole has a size through which the power line can pass.
The motor assembly according to claim 8, wherein a passage hole having a size through which the power line can pass is formed in the outer circumferential side portion.
The heat dissipation plate is
An outer circumferential portion located outside the internal fan;
And an inner circumferential side located inside the outer circumferential side,
The motor assembly according to claim 7, wherein the air hole includes a slit extending from the inner circumferential portion toward the outer circumferential portion.
The motor assembly according to claim 11, wherein the outer peripheral portion is formed with a passage hole having a size through which the power line can pass.