JP6871749B2 - Motor assembly - Google Patents

Description

The present invention relates to an electric motor assembly, and more particularly to an electric motor assembly including a motor and an inverter.

An electric motor assembly in which an inverter is installed in a motor is known. FIG. 12 is a diagram showing an electric motor assembly. As shown in FIG. 12, the electric motor assembly includes a motor unit 100 and an inverter unit 101. The motor unit 100 is provided with a motor (not shown) and a drive shaft 102, and the drive shaft 102 to which the motor is fixed is rotatably supported by a bearing (not shown).

The inverter section 101 is provided with a substrate 106 on which an inverter element for controlling the operation of the motor is mounted, and wiring 107 for power supply and communication. The substrate 106 and the wiring 107 are housed in the inverter housing 105. The inverter housing 105 has a hole 105a formed in the center thereof, and the drive shaft 102 extends through the hole 105a. The substrate 106 and the wiring 107 are arranged around the drive shaft 102.

Japanese Unexamined Patent Publication No. 2001-327116 Japanese Unexamined Patent Publication No. 2005-253184

However, the electric motor assembly shown in FIG. 12 has a structure in which the drive shaft 102 penetrates the inverter section 101, and the drive shaft 102 is a rotating body that rotates at high speed. Therefore, if the wiring 107 is entangled with the rotating drive shaft 102 for some reason, the wiring 107 may be broken or damaged. As a result, it may lead to a serious accident such as damage to the inverter or electric leakage.

As described above, since the drive shaft 102 is rotatably supported by the bearing, foreign matter such as metal powder and lubricating oil (grease) may be scattered from the bearing. If such foreign matter adheres to the substrate 106 of the inverter section 101, the inverter may break down.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an electric motor assembly capable of preventing failure of an inverter.

In order to achieve the above-mentioned object, one aspect of the present invention includes a drive shaft, a motor for rotating the drive shaft, a motor casing in which the motor is arranged, and an inverter for controlling the operation of the motor. The inverter housing is provided with an inverter housing in which the inverter is arranged, and a shaft cover that is arranged inside the inverter housing and covers the periphery of the drive shaft extending from the motor casing toward the inverter housing. It is an electric motor assembly characterized in that it is arranged in an isolated space between the shaft cover and the inverter housing.

A preferred embodiment of the present invention is characterized in that one end of the shaft cover is connected to the motor casing and the other end of the shaft cover is connected to the inverter housing.
A preferred embodiment of the present invention is characterized in that the shaft cover has a tubular shape and is made of metal or resin.
A preferred embodiment of the present invention is further provided with a sealing member for sealing a gap between the shaft cover and the drive shaft.
A preferred embodiment of the present invention is characterized in that the sealing member is composed of a lid and a stopper connected to the lid and located inside the shaft cover.
A preferred embodiment of the present invention is characterized in that the sealing member is composed of an elastic member.

The shaft cover that covers the periphery of the drive shaft can prevent the inverter from coming into contact with the drive shaft and foreign matter from adhering to the inverter. Therefore, the electric motor assembly can prevent the failure of the inverter.

It is a figure which shows one Embodiment of an electric motor assembly. It is a figure which shows the pedestal arranged between a substrate and an end part. It is an enlarged sectional view which shows the other end part of the shaft cover and the end part of an inverter housing. It is an enlarged sectional view which shows the other end part of the shaft cover and the end part of an inverter housing. It is an enlarged sectional view which shows the other end part of the shaft cover and the end part of an inverter housing. It is an enlarged sectional view which shows the other end part of the shaft cover and the end part of an inverter housing. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is a figure which shows the other embodiment of the electric motor assembly. It is a figure which shows the sealing member. It is a figure which shows still another embodiment of the electric motor assembly. It is a figure which shows still another embodiment of the electric motor assembly. It is a figure which shows the electric motor assembly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, the same or corresponding components are designated by the same reference numerals, and duplicate description will be omitted.
FIG. 1 is a diagram showing an embodiment of an electric motor assembly. As shown in FIG. 1, the electric motor assembly 1 is composed of a motor unit 10 and an inverter unit 20 arranged adjacent to the motor unit 10. The electric motor assembly 1 includes a drive shaft 2, a motor 3 for rotating the drive shaft 2, a motor casing 4 in which the motor 3 is arranged, an inverter 22 for controlling the operation (rotational speed) of the motor 3, and the inside. It is provided with an inverter housing 24 in which an inverter 22 is arranged.

As shown in FIG. 1, the inverter unit 20 is arranged adjacent to the motor unit 10. The motor casing 4 and the inverter housing 24 are arranged concentrically with the drive shaft 2, and the drive shaft 2 penetrates the central portion of the motor casing 4 and the central portion of the inverter housing 24. The drive shaft 2 is rotatably supported by a bearing 21. Although one bearing 21 is shown in FIG. 1, the number of bearings is not limited to this embodiment. According to the present embodiment, since the inverter housing 24 is arranged in the axial direction of the drive shaft 2, the electric motor assembly 1 can have a compact structure.

In FIG. 1, the motor 3 is schematically depicted. The motor 3 is, for example, a permanent magnet type motor in which a permanent magnet is used for the rotor. However, the motor 3 is not limited to the permanent magnet type motor, and may be various types of motors such as an induction motor and an SR motor.

The electric motor assembly 1 further includes a cooling fan 8 fixed to the drive shaft 2. The cooling fan 8 is arranged concentrically with the drive shaft 2 and is located outside the inverter housing 24. When the motor 3 is driven, the driving force is transmitted to the drive shaft 2, and the cooling fan 8 fixed to the drive shaft 2 rotates together with the drive shaft 2. As a result, the cooling fan 8 sucks in ambient air, and the sucked air flows on the outer surfaces of the inverter housing 24 and the motor casing 4 to cool the inverter section 20 and the motor section 10. The inverter unit 20 is arranged between the cooling fan 8 and the motor unit 10, and the cooling fan 8, the inverter unit 20, and the motor unit 10 are arranged in series in this order.

The inverter housing 24 is composed of a peripheral wall portion 24a having a cylindrical shape and an end portion 24b that closes the open end portion of the peripheral wall portion 24a. In the present embodiment, the peripheral wall portion 24a and the end portion 24b are integrally configured, but the peripheral wall portion 24a and the end portion 24b may be separate members. The peripheral wall portion 24a of the inverter housing 24 is connected to the rear end surface 4a of the motor casing 4. In one embodiment, the peripheral wall portion 24a of the inverter housing 24 may be connected to the front end surface 4b of the motor casing 4. Here, the rear end surface 4a of the motor casing 4 is a surface facing the cooling fan 8 via the inverter portion 20, and the front end surface 4b of the motor casing 4 is a surface opposite to the rear end surface 4a.

Since the inverter housing 24 serves as a heat sink for the inverter section 20, it is basically composed of a material having relatively high heat dissipation performance (for example, a metal having excellent thermal conductivity such as aluminum (Al)). There is. However, if the heat dissipation performance of the inverter housing 24 can be sufficiently ensured, the inverter housing 24 may be made of a material such as resin in order to reduce the weight and cost.

The inverter housing 24 may be composed of a single material or may be composed of a plurality of materials. In one embodiment, in the inverter housing 24, a portion having a high heat dissipation effect (for example, a portion on the flow path of air sent from the cooling fan 8) and / or a portion having a high need for cooling (for example, a peripheral portion of the inverter 22). ) May be composed of a material having excellent heat dissipation performance such as metal. The parts other than these parts may be made of a material that is lighter in weight than metal or a material that is expected to reduce the cost (for example, resin). The inverter housing 24 may be made of the same material as the shaft cover 30 described later, or may be made of a material different from that of the shaft cover 30.

In the present embodiment, the peripheral wall portion 24a of the inverter housing 24 has a cylindrical shape that matches the outer shape of the motor casing 4. In one embodiment, when the motor casing 4 has a polygonal cylinder shape, the peripheral wall portion 24a of the inverter housing 24 may also have a polygonal cylinder shape according to the outer shape of the motor casing 4. In another embodiment, when the motor casing 4 has a special outer shape due to a member such as a fin or a terminal box, the inverter housing 24 may have a structure matching the shape of the motor casing 4. ..

An opening 25 is formed in the center of the end portion 24b of the inverter housing 24, and the drive shaft 2 extends to the outside of the inverter portion 20 through the opening 25. The inverter 22 is arranged inside the inverter housing 24. The inverter 22 includes an inverter element 26 including elements such as a switching element and a capacitor, and a substrate 27 on which the inverter element 26 is mounted. The substrate 27 is fixed to the inner surface 41 of the end portion 24b via the spacer 42.

FIG. 2 is a diagram showing a pedestal 43 arranged between the substrate 27 and the end portion 24b. As shown in FIG. 2, a pedestal 43 may be provided on the inner surface 41 of the end portion 24b, and the substrate 27 may be installed on the pedestal 43. The pedestal 43 has a wider shape than the spacer 42 described above. In one embodiment, the pedestal 43 may be molded at the same time as the inverter housing 24 is molded. In this case, the pedestal 43 is an integrally molded member with the inverter housing 24. In other embodiments, the pedestal 43 may be a separate member from the inverter housing 24. In this case, the pedestal 43 may be fixed to the inverter housing 24 by fixing means such as screwing or adhesive. The number and shape of the pedestals 43 are not particularly limited as long as the substrate 27 is sufficiently fixed. The pedestal 43 may have a cylindrical shape or a quadrangular prism shape.

The inverter unit 20 is provided with wiring 28 for power supply and communication. In FIG. 1, the wiring 28 is simply drawn. The wiring 28 includes, for example, wiring for power input from a terminal block (not shown), wiring for outputting electric power from the board 27 to the motor 3, and wiring for communication from a device such as a controller. The wiring 28 is a component of the inverter 22.

The electric motor assembly 1 further includes a shaft cover 30 that covers the periphery of the drive shaft 2. The shaft cover 30 is arranged inside the inverter housing 24. The drive shaft 2 extends from the motor casing 4 toward the inverter housing 24. The shaft cover 30 is an isolation member (that is, a partition wall) that separates the drive shaft 2 and the inverter 22. The shaft cover 30 has a cylindrical shape and is arranged concentrically with the drive shaft 2. The shaft cover 30 extends in the axial direction of the drive shaft 2 and has a length corresponding to the distance from the rear end surface 4a of the motor casing 4 to the inner surface 41 of the end portion 24b of the inverter housing 24.

The shaft cover 30 is made of a material (for example, metal or resin) having excellent durability and heat resistance in order to prevent damage due to contact with the drive shaft 2 and / or damage due to heat generated from the inverter 22. It is preferable to have.

The drive shaft 2 is arranged inside the shaft cover 30 in the radial direction, and a gap is formed between the inner peripheral surface of the shaft cover 30 and the outer peripheral surface of the drive shaft 2. The inverter 22 is arranged on the outer side in the radial direction of the shaft cover 30. The shaft cover 30 does not necessarily have to have a cylindrical shape as long as it can cover the periphery of the drive shaft 2 and does not come into contact with members such as the drive shaft 2 and the inverter housing 24. In one embodiment, the shaft cover 30 may have a polygonal tubular shape.

As shown in FIG. 1, one end 30a of the shaft cover 30 is connected to the rear end surface 4a of the motor casing 4, and the other end 30b is connected to the end 24b of the inverter housing 24. In this way, an annular isolation space 35 is formed between the shaft cover 30 and the inverter housing 24. The ends 30a and 30b of the shaft cover 30 may have a cylindrical shape or a polygonal tubular shape.

The shaft cover 30 is connected (fixed) to the motor casing 4 and the inverter housing 24 so that the shaft cover 30 does not fall off from the motor casing 4 and / or the inverter housing 24. More specifically, the shaft cover 30 may be connected (fixed) to the motor casing 4 and the inverter housing 24 with an adhesive, or the contact points between the shaft cover 30 and the motor casing 4 and the shaft cover 30 and the inverter housing. The contact points with the 24 may be welded.

The shaft cover 30 may be connected to these members by other methods as long as the shaft cover 30 can secure a fixing force that does not fall off from the motor casing 4 and / or the inverter housing 24. Hereinafter, the connection structure between the shaft cover 30 and these members will be described. Since the connection structure between one end 30a of the shaft cover 30 and the rear end surface 4a of the motor casing 4 and the connection structure between the other end 30b of the shaft cover 30 and the end 24b of the inverter housing 24 are the same, the drawings are shown below. The connection structure between the other end 30b of the shaft cover 30 and the end 24b of the inverter housing 24 will be described with reference to the above.

3 and 4 are enlarged cross-sectional views showing the other end portion 30b of the shaft cover 30 and the end portion 24b of the inverter housing 24. In FIGS. 3 and 4, the drive shaft 2 is not shown. As shown in FIG. 3, an annular protrusion 40 is formed on the other end 30b of the shaft cover 30, and an annular groove 42 is formed on the inner surface 41 of the end 24b. The annular protrusion 40 and the annular groove 42 are configured to fit each other. In one embodiment, an annular groove may be formed on the other end 30b of the shaft cover 30 and an annular protrusion may be formed on the inner surface 41 of the end 24b.

As shown in FIG. 4, the contact portion between the other end portion 30b of the shaft cover 30 and the end portion 24b of the inverter housing 24 may be welded, or the shaft cover 30 may be fixed to the inverter housing 24 with an adhesive. Good. With such a configuration, the shaft cover 30 is more firmly connected to the motor casing 4 and the inverter housing 24.

FIG. 5 is an enlarged cross-sectional view showing the other end portion 30b of the shaft cover 30 and the end portion 24b of the inverter housing 24. As shown in FIG. 5, the annular groove 42 may be an annular step portion extending to the opening 25 of the end portion 24b. In the embodiment shown in FIG. 5, the annular protrusion 40 is not formed on the other end 30b of the shaft cover 30. The diameter of the annular groove 42 is slightly larger than the outer diameter of the shaft cover 30, and the shaft cover 30 is fitted into the annular groove 42.

FIG. 6 is an enlarged cross-sectional view showing the other end portion 30b of the shaft cover 30 and the end portion 24b of the inverter housing 24. As shown in FIG. 6, the end portion 24b is provided with an annular flange 44, and the shaft cover 30 is fitted into the flange 44. More specifically, the annular flange 44 is connected to the opening 25 of the end portion 24b and extends from the inner surface 41 toward the rear end surface 4a of the motor casing 4 (that is, in a direction away from the inner surface 41). The flange 44 extends parallel to the axial direction of the shaft cover 30. The inner diameter of the shaft cover 30 is slightly larger than the outer diameter of the flange 44.

In the present embodiment, the flange 44 is integrally formed with the inverter housing 24, but may be formed of a member different from the inverter housing 24. Further, in the present embodiment, the flange 44 has an annular shape, but the shape of the flange 44 is not limited to this embodiment. The shape of the flange 44 is determined according to the shape of the end portion 30b of the shaft cover 30. In one embodiment, when the end portion 30b of the shaft cover 30 has a polygonal cylinder shape, the flange 44 also has a polygonal cylinder shape.

The height of the flange 44 can be arbitrarily determined. In one embodiment, the height of the flange 44 may be high enough to fix the shaft cover 30. The contact point between the other end 30b of the shaft cover 30 and the flange 44 may be welded, or the shaft cover 30 may be fixed to the flange 44 of the inverter housing 24 with an adhesive. In another embodiment, when the shaft cover 30 is fixed by a fixing means such as welding or an adhesive, the height of the flange 44 may be high enough to position the shaft cover 30.

FIG. 7 is a cross-sectional view taken along the line AA of FIG. Note that, in FIG. 7, the wiring 28 is not shown. As shown in FIG. 7, the substrate 27 has an annular shape in which an opening 27a is formed in the center thereof. The diameter of the opening 27a is larger than the outer diameter of the shaft cover 30, and the drive shaft 2 penetrates the opening 27a of the substrate 27 and the opening 25 of the end portion 24b and extends to the outside of the inverter portion 20.

The inverter 22 (that is, the inverter element 26, the substrate 27, and the wiring 28) is arranged outside the shaft cover 30 (more specifically, the isolation space 35 between the shaft cover 30 and the inverter housing 24). The shape of the substrate 27 is not necessarily limited to the embodiment shown in FIG. 7 as long as the substrate 27 is arranged in the inverter housing 24 so as to avoid the drive shaft 2 and the shaft cover 30.

According to the present embodiment, the inverter 22 is arranged in the isolation space 35 and is isolated from the drive shaft 2 by the shaft cover 30. Therefore, since the inverter 22 does not come into contact with the drive shaft 2, it is possible to prevent the wiring 28 from being caught in the drive shaft 2 and the inverter element 26 from coming into contact with the drive shaft 2. As a result, failure of the inverter 22 can be reliably prevented.

Further, according to the present embodiment, the inverter 22 (particularly, the substrate 27) does not come into contact with foreign matter such as metal powder or lubricating oil (grease) of the bearing 21 (see FIG. 1) scattered by the rotation of the drive shaft 2. Absent. As a result, failure of the inverter 22 can be reliably prevented.

Since the shaft cover 30 is arranged between the inverter 22 and the drive shaft 2, the shaft cover 30 also functions as a heat insulating material that blocks heat transferred from the inverter 22 to the drive shaft 2. Further, since the shaft cover 30 can block the vibration of the drive shaft 2, the shaft cover 30 can prevent the inverter 22 (more specifically, the inverter element 26) from being damaged.

When the shaft cover 30 is made of an insulating material such as resin, the inverter element 26 can be arranged closer to the drive shaft 2. That is, since the creepage distance between the inverter element 26 and the shaft cover 30 can be reduced, the pattern of the inverter element 26 can be advantageously designed.

Further, according to the present embodiment, the following effects can be obtained. That is, when assembling the electric motor assembly 1 by connecting the motor unit 10 and the inverter unit 20, it is necessary to insert the inverter 22 (more specifically, the substrate 27) into the drive shaft 2 and arrange it at a predetermined position. There is. When the shaft cover 30 is not provided, the inverter 22 must be arranged at a predetermined position so that the inverter 22 such as the board 27 or the wiring 28 does not come into contact with the drive shaft 2, and such work is manually performed. Have difficulty. If you accidentally slide your hand, you may damage the inverter 22 such as the board 27 and the wiring 28. The method of arranging the inverter 22 using a jig has poor work efficiency. According to the present embodiment, since the inverter 22 is arranged at a predetermined position while the drive shaft 2 is covered with the shaft cover 30, the inverter 22 does not come into contact with the drive shaft 2. As described above, since the shaft cover 30 serves as a guide member when the inverter 22 is arranged at a predetermined position, the workability when assembling the electric motor assembly 1 can be improved.

FIG. 8 is a diagram showing another embodiment of the electric motor assembly. In FIG. 8, since the configuration and operation of the present embodiment not particularly described are the same as those of the above-described embodiment, the duplicated description will be omitted.

When the inverter unit 20 is arranged behind the motor unit 10, that is, adjacent to the cooling fan 8, the rotation of the cooling fan 8 may cause liquids such as high humidity outside air and rain to flow into the inverter unit 20. .. When the liquid flows into the inverter section 20, the inverter 22 may be damaged due to a cause such as electric leakage. Therefore, in the present embodiment, in order to more reliably prevent the failure of the inverter 22 due to the infiltration of liquid, the electric motor assembly 1 includes a sealing member 50 that seals the gap between the shaft cover 30 and the drive shaft 2. You may also prepare for it.

FIG. 9 is a diagram showing a sealing member 50. As shown in FIG. 9, the sealing member 50 is composed of a lid 50a and a stopper 50b connected to the lid 50a and located inside the shaft cover 30. The sealing member 50 is arranged on the other end 30b side of the shaft cover 30, and has a structure that prevents the inflow of a fluid such as a liquid or a gas from the outside. More specifically, the sealing member 50 has a structure for sealing the gap between the opening 25 of the end portion 24b and the drive shaft 2 and the gap between the shaft cover 30 and the drive shaft 2. .. In one embodiment, the sealing member 50 may be a self-tightening seal such as a mechanical seal.

In the present embodiment, the sealing member 50 is made of a material capable of ensuring durability, heat resistance, and airtightness, for example, an elastic member such as rubber or resin. In this embodiment, the lid 50a and the stopper 50b are integrally molded members. In one embodiment, the lid 50a and the stopper 50b may be composed of separate members.

In the present embodiment, the sealing member 50 has a through hole 51 formed in the center thereof, and the drive shaft 2 extends through the through hole 51. The sealing member 50 is arranged concentrically with the drive shaft 2. The lid 50a is arranged outside the inverter housing 24, that is, between the cooling fan 8 and the end portion 24b. In one embodiment, the lid 50a may be arranged between the other end 30b of the shaft cover 30 and the inner surface 41 of the end 24b. The stopper 50b extends from the lid 50a toward one end 30a of the shaft cover 30.

In the present embodiment, the sealing member 50 is composed of a lid 50a and a stopper 50b, but the sealing member 50 has a shape (for example, a disk shape, a cylindrical shape, or a cap shape) according to the installation location. You may.

The outer diameter of the lid 50a is larger than the diameter of the opening 25 of the end portion 24b (that is, the inner diameter of the shaft cover 30), and the inner diameter of the lid 50a is smaller than the diameter of the drive shaft 2. The outer diameter of the stopper 50b is larger than the diameter of the opening 25 of the end portion 24b (that is, the inner diameter of the shaft cover 30), and the sealing member 50 is fitted in close contact with the opening 25 of the end portion 24b. The inner diameter of the stopper 50b is smaller than the diameter of the drive shaft 2. With such a configuration, the sealing member 50 can shut off the inverter 22 from the outside air, and as a result, it is possible to more reliably prevent the inverter 22 from coming into contact with a liquid such as rain. According to the present embodiment, the sealing member 50 can prevent dew condensation from occurring in the isolation space 35, and can more reliably protect the inverter 22.

If the sealing member 50 is arranged on a flow path (in this embodiment, a flow path between the drive shaft 2 and the shaft cover 30) where outside air may flow into the inverter 22, its installation location is particularly limited. Not done.

FIG. 10 is a diagram showing still another embodiment of the electric motor assembly 1. As shown in FIG. 10, the electric motor assembly 1 may include a sealing member 51 arranged on the one end portion 30a side of the shaft cover 30. In the embodiment shown in FIG. 10, the sealing member 50 (see FIG. 9) is not provided, and instead, a sealing member 51 is provided. The sealing member 51 has the same structure as the sealing member 50 described above.

The sealing member 51 is composed of a lid 51a and a stopper 51b connected to the lid 51a and located inside the shaft cover 30. The lid 51a is arranged between the rear end surface 4a of the motor casing 4 and one end 30a of the shaft cover 30, and the stopper 51b extends from the lid 51a toward the other end 30b of the shaft cover 30. According to the present embodiment, the sealing member 51 can shut off the inverter 22 from the outside air, and the inverter 22 comes into contact with foreign matter such as metal powder or lubricating oil (grease) scattered from the bearing 21. It can be prevented more reliably.

FIG. 11 is a diagram showing still another embodiment of the electric motor assembly 1. As shown in FIG. 11, the electric motor assembly 1 may include both the sealing members 50 and 51. According to this embodiment, the inverter 22 can be more reliably shut off from the outside air.

The number of sealing members is not limited to the above-described embodiment, and the electric motor assembly 1 may further include sealing members other than the sealing members 50 and 51. In one embodiment, the motor assembly 1 may include a plurality of sealing members as long as the cost-effectiveness of airtightness can be sufficiently expected.

Although the embodiments of the present invention have been described so far, the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention may be implemented in various different forms within the scope of the technical idea.

1 Motor assembly 2 Drive shaft 3 Motor 4 Motor casing 4a Rear end face 4b Front end face 8 Cooling fan 10 Motor part 20 Inverter part 21 Bearing 22 Inverter 24 Inverter housing 24a Peripheral wall part 24b End part 25 Opening 26 Inverter element 27 Board 28 Wiring 30 Shaft cover 30a One end 30b The other end 35 Isolation space 43 Pedestal 44 Flange 50, 51 Sealing member

Claims (7)

Drive shaft and
A motor that rotates the drive shaft and
The motor casing in which the motor is arranged and
An inverter that controls the operation of the motor and
The inverter housing in which the inverter is arranged and
A shaft cover arranged inside the inverter housing and covering the periphery of the drive shaft extending from the motor casing toward the inverter housing.
A flange provided on the inverter housing and into which the shaft cover is fitted is provided.
The inverter is arranged in an isolated space between the shaft cover and the inverter housing.
The flange is a separate member from the inverter housing, and the shape of the flange is determined according to the shape of the end portion of the shaft cover having a cylindrical shape or a polygonal cylinder shape. .. One end of the shaft cover is connected to the motor casing and
The electric motor assembly according to claim 1, wherein the other end of the shaft cover is connected to the inverter housing. The electric motor assembly according to claim 1, wherein the shaft cover has a tubular shape and is made of metal or resin. Drive shaft and
A motor that rotates the drive shaft and
The motor casing in which the motor is arranged and
An inverter that controls the operation of the motor and
The inverter housing in which the inverter is arranged and
A shaft cover arranged inside the inverter housing and covering the periphery of the drive shaft extending from the motor casing toward the inverter housing.
A sealing member that seals the gap between the shaft cover and the drive shaft,
A cooling fan that forms a flow of air towards the inverter housing.
The inverter is arranged in an isolated space between the shaft cover and the inverter housing.
The inverter housing has an opening facing the cooling fan.
The electric motor assembly is characterized in that the sealing member includes a lid that closes a gap between the opening and the drive shaft. The electric motor assembly according to claim 4, wherein the sealing member is connected to the lid and is composed of a stopper located inside the shaft cover. The electric motor assembly according to claim 4, wherein the sealing member is made of an elastic member. The electric motor assembly according to claim 6, wherein the sealing member is made of rubber or resin.

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