JP6871750B2 - 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 an inverter 110 for controlling the operation of the motor. The inverter 110 is housed in the inverter housing 105. The drive shaft 102 extends through the inverter housing 105. It is desirable that the motor assembly provided with the inverter 110 further include ancillary devices such as a filter circuit as a noise countermeasure and a reactor for improving the power factor. Further, it is preferable that the electric motor assembly further includes parts having functions suitable for a wide variety of applications.

Japanese Unexamined Patent Publication No. 11-155257 Japanese Unexamined Patent Publication No. 2012-157194

However, when the optional elements such as the above-mentioned devices and parts are attached to the motor assembly, a case 111 for protecting the optional elements is required. Optional elements are housed in a case 111, which is mounted on the outer surface of the inverter housing 105. As a result, as shown in FIG. 12, the case 111 containing the optional elements protrudes greatly from the outer surface of the inverter housing 105, so that the overall size of the electric motor assembly increases. It is difficult to maintain the shape compatibility of the inverter unit 101 to which the case 111 is attached with the conventional model.

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 having a compact structure even if it is provided with optional elements.

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 for accommodating the motor, an inverter for controlling the operation of the motor, and the inside. The frame includes an inverter housing in which the inverter is arranged and arranged in the axial direction of the drive shaft, a frame arranged in the axial direction of the drive shaft, and optional elements arranged inside the frame. The electric motor assembly is characterized in that the internal space of the inverter housing and the internal space of the inverter housing are communicated with each other.

A preferred embodiment of the present invention is characterized in that the frame has a tubular shape and is arranged concentrically with the drive shaft.
In a preferred embodiment of the present invention, the optional elements include a noise filter that suppresses noise generated from the inverter, a DC reactor that improves the power factor of the inverter, a temperature sensor that measures the temperature of the motor, and vibration of the motor. A vibration sensor for measurement, a controller for controlling the inverter, a communication device for communicating between the inverter and an external device, a recording device for recording information on the motor, an auxiliary battery for emergency operation, a heater for preventing freezing, and the above. It is characterized by being selected from auxiliary cooling fans fixed to the drive shaft.
A preferred embodiment of the present invention is characterized in that the frame is a plurality of frames, and at least one of the plurality of frames is arranged on the opposite side of the inverter housing with respect to the motor casing.
A preferred embodiment of the present invention is characterized in that the frame is a plurality of frames, and the internal spaces of adjacent frames are communicated with each other.

According to the present invention, since the optional elements are arranged inside the frame arranged in the axial direction of the drive shaft, the electric motor assembly can have a compact structure.

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 a figure which shows the connection structure of a frame and a motor casing, and the connection structure of a frame and an inverter housing. It is a figure which shows the leg member attached to the outer surface of a frame. It is a figure which combined the structure which determines the position of a frame. It is a figure which shows the electric motor assembly which provided with the auxiliary cooling fan as an optional element. It is a figure which shows the inverter and the optional element which were electrically connected with wiring. It is a figure which shows the inverter and the motor which are electrically connected with wiring. It is a figure which shows the inverter and the motor which are electrically connected with wiring. It is a figure which shows the other 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 includes a drive shaft 2, a motor 3 for rotating the drive shaft 2, a motor casing 4 for accommodating the motor 3, and an inverter for controlling the operation (rotational speed) of the motor 3. 22, an inverter housing 24 in which the inverter 22 is arranged inside and arranged in the axial direction of the drive shaft 2, a frame 60 adjacent to the inverter housing 24 and arranged in the axial direction of the drive shaft 2, and a frame. It includes an optional element 61 arranged inside the 60.

According to the present embodiment, since the inverter housing 24 and the frame 60 are arranged in the axial direction of the drive shaft 2, the outer shape of the inverter housing 24 and the outer shape of the frame 60 can be matched with the outer shape of the motor casing 4. it can. Therefore, the electric motor assembly 1 can have a compact structure.

As shown in FIG. 1, the motor casing 4, the frame 60, and the inverter housing 24 are arranged concentrically with the drive shaft 2, and the drive shaft 2 has a central portion of the motor casing 4 and a central portion of the inverter housing 24. It penetrates.

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, which flows over the outer surfaces of the inverter housing 24, the frame 60, and the motor casing 4 to cool the components of the motor assembly 1.

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.

In the present embodiment, the frame 60 has a cylindrical shape that matches the outer shape of the motor casing 4. The peripheral wall portion 24a of the inverter housing 24 also has a cylindrical shape. In one embodiment, when the motor casing 4 has a polygonal cylinder shape, the peripheral wall portion 24a of the frame 60 and 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 frame 60 and the inverter housing 24 have a structure that matches the outer shape of the motor casing 4. You may.

The frame 60 is connected to both the inverter housing 24 and the motor casing 4, and is arranged between the inverter housing 24 and the motor casing 4. The inverter housing 24, the frame 60, and the motor casing 4 are arranged in series in this order.

One end 60a of the frame 60 is connected to the rear end surface 4a of the motor casing 4, and the other end 60b of the frame 60 is connected to the end surface of the peripheral wall portion 24a of the inverter housing 24. Here, the other end 60b of the frame 60 is a surface facing the cooling fan 8 via the inverter housing 24, and the one end 60a of the frame 60 is the surface opposite to the other end 60b. The rear end surface 4a of the motor casing 4 is a surface facing one end 60a of the frame 60, and the front end surface 4b of the motor casing 4 is a surface opposite to the rear end surface 4a. In one embodiment, the frame 60 may be connected to the front end surface 4b of the motor casing 4. The drive shaft 2 may have a length as required.

The frame 60 is made of a hard member such as metal or an elastic member such as resin. In one embodiment, the frame 60 made of packing-like rubber can improve mechanical properties such as waterproofing and vibration.

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 housing 24 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 substrate 27 has an annular shape with an opening 27a formed in the center thereof. The diameter of the opening 27a is larger than the diameter of the drive shaft 2, and the drive shaft 2 penetrates the opening 27a of the substrate 27 and the opening 25 of the end portion 24b. The substrate 27 is arranged concentrically with the drive shaft 2.

The frame 60 does not have a portion corresponding to the end portion 24b of the inverter housing 24, and the internal space 80A of the frame 60 and the internal space 80B of the inverter housing 24 communicate with each other. That is, as shown in FIG. 1, a single space that is not partitioned by the motor casing 4, the frame 60, and the inverter housing 24 is formed. Hereinafter, in the specification, these internal spaces 80A and 80B may be collectively referred to as a single space.

Since the single space is formed in the electric motor assembly 1, the inverter element 26 can be arranged along the axial direction of the drive shaft 2 even if the size of the inverter element 26 in the axial direction is slightly large. In this embodiment, most of the inverter element 26 is located in the internal space 80A of the frame 60.

As described above, the motor assembly 1 further includes an optional element 61 arranged inside the frame 60. The optional element 61 is an element capable of improving the function (performance) of the electric motor assembly 1. The option element 61 and the inverter 22 are arranged in the axial direction of the drive shaft 2.

Optional elements 61 include, for example, a noise filter that suppresses noise generated from the inverter 22, a DC reactor that improves the power factor of the inverter 22, a temperature sensor that measures the temperature of the motor 3, and a vibration sensor that measures the vibration of the motor 3. A controller that controls the inverter 22, a communication device that communicates between the inverter 22 and an external device (not shown), a recording device that records information of the motor 3, an auxiliary battery for emergency operation, a heater for antifreeze, and a drive shaft. It is selected from the auxiliary cooling fan fixed to 2.

When the option element 61 is composed of a sensor such as a temperature sensor for measuring the temperature of the motor 3 or a vibration sensor for measuring the vibration of the motor 3, the option element 61 is preferably arranged at a position close to the motor 3. .. Therefore, in this case, the frame 60 may be connected to the front end surface 4b of the motor casing 4.

In this embodiment, the option element 61 is schematically drawn. As shown in FIG. 1, the option element 61 may include a substrate 61a located inside the frame 60. Hereinafter, the option element 61 including the substrate 61a will be described in the specification.

The substrate 61a has the same shape as the substrate 27 described above, and a through hole through which the drive shaft 2 penetrates is formed in the center thereof. According to the present embodiment, the frame 60 is arranged in the axial direction of the drive shaft 2, and the option element 61 including the substrate 61a is arranged inside the frame 60. Therefore, the overall size of the electric motor assembly 1 can be reduced. As a result, the motor assembly 1 can have a compact structure even with the optional element 61.

As shown in FIG. 1, an annular protrusion 62 extending from the inner surface 60c of the frame 60 toward the drive shaft 2 is formed on the inner surface 60c of the frame 60. The diameter of the substrate 61a is larger than the diameter of the protrusion 62 (that is, the inner diameter) so that the substrate 61a is supported by the protrusion 62. In the present embodiment, the protrusion 62 has an annular shape, and the substrate 61a is fixed on the protrusion 62. In one embodiment, the protrusion 62 may be composed of a plurality of protruding members. These plurality of protruding members are arranged at equal intervals along the circumferential direction of the drive shaft 2. Depending on the optional element 61 selected, the frame 60 does not necessarily have to include the protrusions 62.

The protrusion 62 has a size such that the space 80A formed inside the frame 60 and the space 80B formed inside the inverter housing 24 can communicate with each other. That is, the protrusion 62 has a size that does not hinder the formation of a single space.

FIG. 3 is a diagram showing a connection structure between the frame 60 and the motor casing 4 and a connection structure between the frame 60 and the inverter housing 24. In FIG. 3, the inverter 22 and the optional element 61 are not shown. As shown in FIG. 3, one end 60a of the frame 60 is provided with an annular convex portion 65, and the rear end surface 4a of the motor casing 4 is provided with an annular concave portion 66. The annular protrusion 65 and the annular recess 66 are arranged concentrically with the drive shaft 2 and are configured to fit each other. When the annular protrusion 65 is fitted into the annular recess 66, the frame 60 is connected to the motor casing 4. An annular concave portion may be provided at one end 60a of the frame 60, and an annular convex portion may be provided at the rear end surface 4a of the motor casing 4.

An annular recess 67 is formed in the other end 60b of the frame 60, and an annular convex 68 is formed in the end surface of the peripheral wall portion 24a of the inverter housing 24. The annular protrusion 68 and the annular recess 67 are arranged concentrically with the drive shaft 2 and are configured to fit each other. When the annular convex portion 68 is fitted into the annular concave portion 67, the inverter housing 24 is connected to the frame 60. An annular convex portion may be provided on the other end 60b of the frame 60, and an annular concave portion may be provided on the end surface of the peripheral wall portion 24a of the inverter housing 24. According to such a connection structure, the frame 60 can rotate about the drive shaft 2.

The connection structure of the frame 60 is not limited to the above-described embodiment. In one embodiment, an annular outer notch is formed on either one end 60a and the other end 60b of the frame 60, and an annular inner notch is formed on the other. An annular inner notch corresponding to the outer notch formed in the frame 60 is formed in either the motor casing 4 or the inverter housing 24, and an annular outer notch corresponding to the inner notch formed in the frame 60 is formed on the other. Form a notch. Even with such a configuration, the frame 60 is connected to the motor casing 4 and the inverter housing 24.

Depending on the arrangement of the inverter element 26 and the arrangement of the optional element 61, it may be necessary to determine the relative position between the frame 60 and the motor casing 4 and the relative position between the frame 60 and the inverter housing 24. Hereinafter, a configuration for determining the relative positions of the inverter housing 24, the frame 60, and the motor casing 4 will be described.

In one embodiment, at least one protrusion may be provided on one end 60a of the frame 60, and a recess corresponding to this protrusion may be provided on the rear end surface 4a of the motor casing 4. By inserting the protruding portion into the recess, the relative position between the frame 60 and the motor casing 4 can be determined. Similarly, at least one protrusion may be provided on the end surface of the peripheral wall portion 24a of the inverter housing 24, and a recess corresponding to this protrusion may be provided on the other end 60b of the frame 60. By inserting the protruding portion into the recess, the relative position between the frame 60 and the inverter housing 24 can be determined.

In another embodiment, the frame 60 may be fixed to each of the motor casing 4 and the inverter housing 24 by a threaded fitting. With such a configuration, the relative position between the frame 60 and the motor casing 4 and the relative position between the frame 60 and the inverter housing 24 can be determined.

In still another embodiment, as shown in FIG. 4, the leg member 69 may be attached to the frame 60, and the frame 60 may be arranged so that the leg member 69 is located directly below the frame 60.

In still other embodiments, marks may be provided on the outer surface 60d of the frame 60, the outer surface of the motor casing 4, and the peripheral wall portion 24a of the inverter housing 24, respectively. By arranging these members so that the marks provided on the members are aligned in a straight line, the relative positions of the frame 60 and the motor casing 4 and the relative positions of the frame 60 and the inverter housing 24 can be determined. .. The marker may be, for example, a character such as "up" or "down", or a symbol such as an arrow or "Δ".

The motor casing 4, the frame 60, and the inverter housing 24 may be fastened with fasteners such as screws in a state where the motor casing 4, the frame 60, and the inverter housing 24 are connected. As an example of the fastener, a combination of a through bolt and a nut for fastening the motor casing 4, the frame 60, and the inverter housing 24 together can be mentioned. With such a configuration, these members are more firmly fastened.

The above-mentioned configurations for determining the relative position may be appropriately combined. For example, as shown in FIG. 5, the leg member 69 is attached to the outer surface of the frame 60, and the outer surface 60d of the frame 60, the outer surface of the motor casing 4, and the peripheral wall portion 24a of the inverter housing 24 are marked (the embodiment shown in FIG. 5). Then, an arrow) may be provided.

According to the above-described embodiment, since the frame 60 can be easily positioned, it is possible to prevent the frame 60 from being erroneously connected, and it is possible to improve the workability of the electric motor assembly 1.

FIG. 6 is a diagram showing an electric motor assembly 1 provided with an auxiliary cooling fan as an optional element 61. As shown in FIG. 6, the auxiliary cooling fan 61 is fixed to the drive shaft 2 and is arranged concentrically with the drive shaft 2. When the motor 3 is driven and the drive shaft 2 is rotated, the auxiliary cooling fan 61 is also rotated together with the drive shaft 2 to suck in the ambient air. The air sucked by the auxiliary cooling fan 61 flows through the internal space 80A of the frame 60 and the internal space 80B of the inverter housing 24, and circulates in these internal spaces 80A and 80B.

According to the present embodiment, the heat generated in the inverter 22 is diffused in both the internal space 80A and the internal space 80B by the rotation of the auxiliary cooling fan 61, so that the inverter 22 can be cooled efficiently.

The optional element 61 in the frame 60 may be connected to the inverter 22 through wiring. FIG. 7 is a diagram showing an inverter 22 and an optional element 61 electrically connected through wiring 90. As shown in FIG. 7, connectors (or terminal blocks) 91 and 92 are fixed to the front surface (mounting surface) of the board 27 and the back surface (the surface opposite to the mounting surface) of the board 61a, respectively, and wiring is performed. 90 is connected to connectors 91 and 92.

The inverter 22 and the optional element 61 are electrically connected through wiring 90 arranged in a single space. In one embodiment, instead of providing the connectors 91 and 92, a bus bar may be provided. In other embodiments, the wiring 90 may be soldered to the substrates 27, 61a, respectively.

According to the present embodiment, since the wiring 90 is arranged in a single space, the inverter 22 is electrically connected to the option element 61 without forming a hole for wiring in either the inverter housing 24 or the frame 60. Can be connected to. Therefore, it is possible to prevent the strength and airtightness of the electric motor assembly 1 from being lowered, and the electric motor assembly 1 can have a simple structure.

FIG. 8 is a diagram showing an inverter 22 and a motor 3 electrically connected through wiring 90. It may be necessary to connect the inverter 22 directly to the motor 3. As shown in FIG. 8, the inverter 22 may be electrically connected to the motor 3 through the wiring 90. The wiring 90 passes through the through hole 61b formed in the substrate 61a. The through hole 61b has a size that allows the wiring 90 to pass through. The shape of the through hole 61b is not particularly limited as long as the wiring 90 can penetrate.

FIG. 9 is a diagram showing an inverter 22 and a motor 3 electrically connected through wirings 90 and 93. As shown in FIG. 9, the connector 94 is fixed to the surface (mounting surface) of the substrate 61a, and the wiring 93 is connected to the connector 94 and the motor 3. In this way, the inverter 22 is electrically connected to the motor 3 through the wirings 90 and 93. According to this embodiment, the inverter 22 can be electrically connected to the motor 3 without forming the through hole 61b in the substrate 61a. The embodiments shown in FIGS. 7 to 9 can be combined as appropriate.

FIG. 10 is a diagram showing another embodiment of the electric motor assembly 1. In FIG. 10, the configuration and operation of the present embodiment, which are not particularly described, are the same as those of the above-described embodiment, and thus the duplicate description thereof will be omitted.

As shown in FIG. 10, the motor assembly 1 includes a plurality of frames 60, 70, 71 and a plurality of optional elements 61, 75, 76. In the present embodiment, the electric motor assembly 1 includes three frames, but the number of frames is not limited to the present embodiment. Two frames may be provided, or four or more frames may be provided. Similarly, the motor assembly 1 includes three optional elements, but the number of optional elements is not limited to this embodiment. Two optional elements may be provided, and four or more optional elements may be provided.

The plurality of frames 60, 70, 71 and the plurality of optional elements 61, 75, 76 are arranged in the axial direction of the drive shaft 2. In the present embodiment, the internal space 80B of the inverter housing 24, the internal space 80A of the frame 60, the internal space 80C of the frame 70, and the internal space 80D of the frame 71 are communicated with each other. A space is formed. In other words, the internal spaces of adjacent frames are connected.

The number of frames basically corresponds to the number of optional elements 61, and the number of optional elements 61 is determined according to various conditions such as operating conditions and applications of the electric motor assembly 1. In one embodiment, when it is necessary to take measures against noise and improve the power factor of the inverter 22, and further to cool the inverter 22, the electric motor assembly 1 includes an auxiliary cooling fan 61 and a noise filter (noise circuit). 75, and DC reactor 76 may be provided (see FIG. 10).

In the present embodiment, the option elements 61, 75, 76 are arranged in this order, but the arrangement order of the option elements 61, 75, 76 is not limited to this embodiment. The arrangement order of the optional elements 61, 75, 76 may be interchanged if there are no functional restrictions. In one embodiment, the optional elements 76, 75, 61 may be arranged in this order. In another embodiment, if the option elements 76 need to be arranged on the motor side, the option elements 75, 61, 76 may be arranged in this order.

FIG. 11 is a diagram showing still another embodiment of the electric motor assembly 1. As shown in FIG. 11, the motor assembly 1 may further include a frame 77 and optional elements (not shown) arranged on the opposite side of the inverter housing 24 with respect to the motor casing 4. In this way, the frame 77 may be connected to the front end surface 4b of the motor casing 4. The frame 77 is arranged in the axial direction of the drive shaft 2.

According to the above-described embodiment, since the arrangement order of the optional elements can be arbitrarily determined, the optional elements can be easily rearranged as needed, and the optional elements can be easily added or removed. .. As a result, the expandability and workability of the electric motor assembly 1 can be improved.

Further, since the number of optional elements can be arbitrarily determined, the motor assembly 1 can have the minimum necessary functions. Therefore, the overall cost of the electric motor assembly 1 can be reduced. It is possible to provide the electric motor assembly 1 to a wide range of fields while suppressing the price of the electric motor assembly 1. Further, since the plurality of frames have the same shape, the manufacturing cost and the inventory cost of the frames can be reduced.

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 22 Inverter 24 Inverter housing 24a Peripheral wall part 24b End part 26 Inverter element 27 Board 42 Spacer 43 Pedestal 60, 70, 71, 77 Frame 60a One end 60b The other end 60c Inner surface 60d Outer surface 61, 75, 76 Optional element 62 Protrusion 65, 68 Convex 66, 67 Recess 69 Leg member 80A-80D Space 90, 93 Wiring 91, 92, 94 Connector

Claims (8)

Drive shaft and
A motor that rotates the drive shaft and
The motor casing that houses the motor and
An inverter that controls the operation of the motor and
An inverter housing in which the inverter is arranged and arranged in the axial direction of the drive shaft,
A frame arranged in the axial direction of the drive shaft and
With optional elements placed inside the frame
The internal space of the frame and the internal space of the inverter housing are in communication with each other.
The drive shaft extends through the frame and the inverter housing.
An electric motor assembly characterized in that the frame and the inverter housing have a structure that matches the outer shape of the motor casing. The electric motor assembly according to claim 1, wherein the frame has a tubular shape and is arranged concentrically with the drive shaft. The optional elements include a noise filter that suppresses noise generated from the inverter, a DC reactor that improves the power factor of the inverter, a temperature sensor that measures the temperature of the motor, a vibration sensor that measures the vibration of the motor, and the inverter. A controller that controls the inverter, a communication device that communicates between the inverter and an external device, a recording device that records information about the motor, an auxiliary battery for emergency operation, a heater for preventing freezing, and an auxiliary fixed to the drive shaft. The electric motor assembly according to claim 1, wherein the motor assembly is selected from cooling fans. The frame is a plurality of frames.
The electric motor assembly according to claim 1, wherein at least one of the plurality of frames is arranged on the opposite side of the inverter housing with respect to the motor casing. The frame is a plurality of frames.
The electric motor assembly according to claim 1, wherein the internal spaces of the frames arranged adjacent to each other are communicated with each other. The electric motor assembly according to any one of claims 1 to 5, wherein the optional element in the frame is connected to the inverter through wiring. Any of claims 1 to 6, wherein the electric motor assembly has a configuration for determining a relative position between the frame and the motor casing and a relative position between the frame and the inverter housing. The electric motor assembly according to the first paragraph. The electric motor assembly includes a cooling fan fixed to the drive shaft extending through the inverter housing.
The electric motor assembly according to any one of claims 1 to 7, wherein the cooling fan is located outside the inverter housing.

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