KR20140038088A - Motor-driven compressor - Google Patents

Abstract

The present invention relates to a motor-driven compressor, in accordance with an embodiment of the present invention, in order to improve the inverter cooling effect, there is provided a motor-driven compressor for the heat dissipation of the inverter is installed at the lower end of the gravity direction of the motor portion in which the refrigerant flows.

Description

Automotive electric compressors {ELECTRIC MOTOR-DRIVEN COMPRESSOR FOR VEHICLE}

The present invention relates to a motor-driven compressor, and more particularly, to a motor-driven compressor in which the heat sink of the inverter is installed at the lower end of the gravity direction of the motor unit into which the refrigerant flows in order to improve the inverter cooling effect.

Generally, a compressor used in an air conditioning system of an automobile sucks refrigerant that has been evaporated from an evaporator, converts it into a high-temperature and high-pressure state which is easy to be liquefied, and transfers it to a condenser.

Such a compressor includes a reciprocating type in which a compression mechanism that compresses refrigerant actually performs compression while performing a reciprocating motion and a rotary type in which compression is performed while rotating. In this case, a mechanical type And an electric type using a motor as a driving source.

An electric compressor uses a separate motor to drive the compressor. In this case, the rotation speed of the motor is controlled by the inverter of the electric compressor.

Generally, the cooling of the electric compressor is performed in such a manner that the refrigerant used for compression is led to a portion where the motor of the compressor is installed, so that heat generated from the motor is absorbed by the refrigerant.

In addition, the inverter provided in the electric compressor also requires a separate cooling during the operation of the compressor, the inverter is used a number of heat generating elements that generate heat during operation, these heat generating elements are cooled by allowing the refrigerant to flow directly because the durability is weak. It is difficult to carry out.

Accordingly, in Japanese Patent Laid-Open Publication No. 2000-291557 (Patent Document 1), an inverter is provided on the wall surface of the compressor on the refrigerant suction side, and the inverter is cooled by the cooling heat of the refrigerant transmitted to the suction side wall surface.

FIG. 1 shows the electric compressor of Patent Document 1, and the appearance of the compressor 10 is an intermediate housing 52 in which the motor 80 is installed, and a discharge housing 51 provided on both sides of the intermediate housing 52, respectively. And the suction housing 1, and the intermediate housing 52, the discharge housing 51, and the suction housing 1 are all communicated with each other.

At this time, the motor 80 includes a stator core 81, a winding bundle 82 wound around the stator core 81, a rotor 83 rotatably installed inside the stator core 81, and a rotating shaft. (55).

In addition, the suction housing 1 is formed with a suction port 8 for suction of refrigerant, and a driving circuit (corresponding to the inverter) for controlling the driving of the motor 80 on one side wall 1b of the suction housing 1. (4) is installed, the intermediate housing (52) is provided with a motor (80) for transmitting a driving force for compression, the discharge housing (51) fixed scroll (60) and movable scroll (70) for compressing the refrigerant. ) Is provided.

Here, looking at the flow of the refrigerant in the electric compressor, the refrigerant is first introduced through the suction port 8 of the suction housing (1). The introduced refrigerant absorbs the heat transferred to the wall surface 1b of the suction housing 1 among the heat generated by the driving circuit 4 while passing through the suction housing 1. The refrigerant absorbing heat of the driving circuit 4 cools the motor 80 installed in the intermediate housing 52 while passing through the intermediate housing 52. The refrigerant cooled by the motor 80 flows into the discharge housing 51 again and is compressed by the fixed scroll 60 and the movable scroll 70 of the discharge housing 51 and discharged to the outside.

However, in the conventional electric compressor having such a configuration, before the refrigerant flowing into the suction housing 1 through the suction port 8 flows into the intermediate housing 52, the wall surface 1b is cooled for a short time. Therefore, there is a problem that does not sufficiently absorb the heat generated by the inverter.

That is, as shown in FIG. 1, the conventional electric compressor 10 is disposed in the longitudinal direction with respect to the bottom surface of the vehicle. At this time, the suction port 8 is formed at the upper end of the suction housing 1, and the inverter is suction suction 1. ) Is installed on one side of the wall surface (1b) formed vertically.

Therefore, the refrigerant flowing into the suction housing 1 through the suction port 8 absorbs the heat of the inverter only for a short time during which a part of the refrigerant flows down along the wall surface 1b, and then immediately flows through the intermediate housing 52 It is to flow in the discharge housing 51 direction.

In addition, depending on the operating conditions of the compressor, only a part of the flow rate of the refrigerant flowed in contact with the wall surface 1b, and most of the remaining flows directly to the intermediate housing 52 opposite to the wall surface 1b. It may also happen that the case is not sufficiently cooled.

Patent Document 1: Japanese Patent Application Laid-Open No. 2000-291557 (2000.10.17 publication)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems as described above, and an embodiment of the present invention is to provide a compressor, in which a suction port is formed, so that the refrigerant introduced into the compressor through the suction port can cool the inverter for a sufficient time, And to a motor-driven compressor in which a heat sink of the inverter is arranged below the gravity direction of the sub.

According to a preferred embodiment of the present invention, there is provided a motor having a rotating shaft therein, the motor portion is formed with a suction port for refrigerant suction on one side; A compression unit coupled to one side of the motor unit and having a compression mechanism for compressing a refrigerant by the operation of the motor; An inverter unit coupled to a lower end of an outer circumferential surface of the motor unit and accommodating an inverter controlling the motor; And a heat dissipation plate provided at one side of the inverter unit, the heat sink being cooled by receiving cooling heat from the refrigerant flowing into the motor unit and falling in the gravity direction.

Here, the motor unit may further include a mounting unit formed at one side of the outer circumferential surface and assembled at one side of the engine such that the rotating shaft is horizontally disposed.

Preferably, the heat sink is provided at an upper end of the inverter unit so that the upper surface of the heat sink is opposed to the lower outer circumferential surface of the motor unit.

According to another embodiment of the present invention, there is provided an air conditioner comprising: a motor unit having a motor having a rotating shaft therein and having a suction port for sucking refrigerant; A compression unit coupled to an upper end of the motor unit and having a compression mechanism for compressing a refrigerant by the operation of the motor; An inverter unit coupled to a lower end of the motor unit so as to face the compression unit with the motor unit interposed therebetween, the inverter controlling the motor being accommodated; And a heat dissipation plate provided at one side of the inverter unit, the heat sink being cooled by receiving cooling heat from the refrigerant flowing into the motor unit and falling in the gravity direction.

In this case, the motor unit may further include a mounting unit formed on one side of the outer circumferential surface and assembled to one side of the engine such that the rotation shaft is disposed vertically.

In addition, the heat sink is preferably provided at the upper end of the inverter portion so that the upper side facing the lower end of the motor portion.

According to another embodiment of the present invention, there is provided an air conditioner comprising: a motor unit having a motor having a rotating shaft therein, and having a suction port formed therein for sucking refrigerant; A compression unit coupled to one side of the motor unit and having a compression mechanism for compressing a refrigerant by the operation of the motor; An inverter unit coupled to the other side of the motor unit and accommodating an inverter controlling the motor; A mounting part formed at one side of the outer circumferential surface of the motor part and assembled to one side of the engine such that the rotating shaft is horizontally disposed; And a heat dissipation plate provided at one side of the inverter unit opposite to the motor unit and receiving a cooling heat from the refrigerant flowing into the motor unit.

At this time, the suction port is preferably formed on the upper portion of the heat sink so that the refrigerant sucked through the suction port can fall in the direction of gravity across the heat sink.

In addition, it is preferable that two-thirds or more of the heat sink area is disposed at the lower end of the rotary shaft based on the center axis line.

According to the motor-driven compressor of the present invention, since the heat radiating plate of the inverter is provided so as to be in close contact with the lower end of the motor portion in the gravity direction, the refrigerant flowing into the motor portion through the suction port, There is an effect that the cooling of the product is efficiently performed.

In addition, according to the motor-driven compressor according to another embodiment of the present invention, the suction port is formed on the upper portion of the heat sink, and the refrigerant sucked through the suction port falls across the heat sink in the direction of gravity, cooling the inverter efficiently The effect is made of.

1 is a cross-sectional view of a conventional electric compressor.
2 is a sectional view of a motor-driven compressor for a vehicle according to a first embodiment of the present invention;
3 is a sectional view of a motor-driven compressor for a vehicle according to a second embodiment of the present invention.
4 is a sectional view of a motor-driven compressor for a vehicle according to a third embodiment of the present invention;
5 is a layout view of a heat sink according to a third embodiment of the present invention;
6 is a schematic view of a conventional heat sink;

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the present invention a motor-driven electric compressor will be described. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, Embodiments that include components replaceable as equivalents in the elements may be included within the scope of the present invention.

In addition, the following embodiments are described in particular as a scroll compressor having a fixed scroll and a rotating scroll as a compression mechanism as an example, but the present invention is not limited thereto, such as a swash plate type compressor having a swash plate as a compression mechanism The present invention can be applied to various types of electric compressors to which a motor is applied as a driving source of the electric motor.

First Embodiment

2 is a cross-sectional view of a motor-driven compressor for a vehicle according to a first embodiment of the present invention.

2, a motor-driven compressor (hereinafter referred to as a 'compressor') 100 according to a first embodiment of the present invention includes a motor unit 200, a compression unit 300, and an inverter unit 400 ), And may further include a mounting unit 500 formed on one side of the motor unit 200 to assemble the compressor 100 to one side of the engine (not shown).

Here, the motor unit 200 is a part for generating the rotational power of the compressor 100, and consists of a motor unit housing 210 forming an outer body and a motor 220 accommodated in the motor unit housing 210, wherein The motor 220 includes a stator 230 installed along the inner circumferential surface of the motor housing 210 and a rotor 240 rotated inside the stator 230.

A suction port (not shown) for suctioning refrigerant is formed through one side of the outer circumferential surface of the motor housing 210, and a motor housing 210 is connected to one side of the engine Mounting unit 500 is formed to be assembled to.

That is, the compressor 100 is assembled and fixed to one side of the engine by fasteners such as bolts fastened through the mounting part 500. The compressor 100 according to the first embodiment of the present invention is shown in FIG. As shown in FIG. 3, the rotary shaft 241 to be described later is assembled to one side of the engine so as to be horizontally disposed with the vehicle bottom surface.

In addition, a bearing housing 212 protrudes from a bottom surface facing the open side of the motor unit housing 210, and a bearing 213 for rotatably supporting the rotating shaft 241 described later on the bearing housing 212. Is fixedly installed.

The stator 230 is a driving part that generates a rotational driving force together with the rotor 240 mounted coaxially inside, and is a stator core 231 fixedly mounted on the inner circumferential surface of the motor housing 210 as a kind of electromagnet. And a coil bundle 232 wound around the stator core 231. At this time, when a current flows through the coil bundle 232, a magnetic field is formed in the stator 230.

In addition, as described above, the rotor 240 is a portion coaxially mounted to the inside of the stator 230 to drive rotation, and as an example, a plurality of core pieces may be stacked and formed.

At this time, the rotor 240 is rotatably inserted into the central through-hole of the stator core 231 of the stator 230, the rotary shaft 241 is disposed long along the central axis, and the outer peripheral surface of the rotary shaft 241 It consists of a permanent magnet 242 to be attached.

Accordingly, the rotor 240 is rotationally driven by interaction with the stator 230 according to the driving principle of the motor when the stator 230 is excited, and is rotated by the rotating shaft 241, Rotational driving force is transmitted.

The compression unit 300 compresses the refrigerant by receiving the rotary driving force generated by the motor unit 200 and is connected to one end of the rotary shaft 241 of the motor unit 200 as shown in FIG. .

At this time, the compression unit 300 is a compression unit housing 310 is coupled to one side of the motor unit housing 210, the rotating scroll 320 is rotatably mounted in the compression unit housing 310, and this turning And a fixed scroll 330 paired with the scroll 320 to compress the refrigerant. The relative rotation of the orbiting scroll 320 and the fixed scroll 330 allows the compression chamber 340, which is formed therebetween, Thereby compressing the refrigerant introduced into the inside.

In detail, the orbiting scroll 320 is formed with a orbiting scroll wrap 321 bent in a spiral shape so as to converge toward the center, and the motor part 200 is provided at the center of the orbiting scroll wrap 321. [ The rear end of the rotary shaft 241 is coupled to rotate in synchronization with the rotor 240.

In addition, the fixed scroll 330 is fixedly installed on the inner rear end of the motor unit housing 210, so that the fixed scroll wrap 331 curved in a spiral form to be matched with the swing scroll wrap 321 of the swing scroll 320 It is formed to converge toward the center.

Therefore, when the turning scroll 320 rotates, the rotating scroll 320 and the fixed scroll 330 which are matched with each other turn by the interaction of the turning and fixed scroll wraps 321 and 331, respectively, in the motor unit 200. And the fixed scroll wrap 321 and 331. The refrigerant compressed at a high pressure passes through the discharge port 332 formed through the fixed scroll 330 and flows into the compression housing 310 through the high pressure It is discharged to the chamber 350.

At this time, one side of the compression unit 310 is coupled to the open end of the motor housing 210, the intermediate housing 360 may be interposed between the motor housing 210 and the compression housing 310. , And a discharge port (not shown) for discharging the compressed refrigerant to the outside is formed at one side of the compression housing 310.

The inverter unit 400 controls the operation of the motor unit 200. The inverter unit 400 converts DC power into AC power and is electrically connected to the stator 230 of the motor unit 200, According to the first embodiment of the present invention, the inverter unit 400 is disposed at the lower end of the outer circumferential surface of the motor unit 200, In other words, the motor unit 200 is coupled to the lower side in the gravity direction.

The inverter unit 400 is mounted on the inverter unit housing 410 coupled to the lower end of the outer circumferential surface of the motor unit housing 210, the PCB 420 mounted inside the inverter unit housing 410, and the PCB 420. An inverter 430 including various electronic components such as an insulated gate bipolar transistor (IGBT) element 431, and a heat sink 432 provided on one side of the inverter 430.

Here, as a plurality of heat generating elements that generate heat during operation are used in the inverter 430, the inverter 430 may be cooled separately from the motor 220 while the compressor 100 is operated to prevent malfunction of the inverter 430. According to the first embodiment of the present invention, the heat generated in the inverter 430 is transferred to the refrigerant introduced into the motor housing 210, thereby cooling the inverter 430. That is, the inverter 430 is cooled by the cooling heat of the refrigerant.

At this time, according to the first embodiment of the present invention, the inverter housing 410 is coupled to the outer peripheral surface of the lower end of the motor housing 210, the heat sink 432 of the inverter 430 is gravity of the motor housing 210 Direction of the inverter housing 410 so as to face the lower end of the inverter housing 410.

This is to allow the heat dissipation plate 432 of the inverter 430 to be cooled more efficiently by the flow of the coolant, and the coolant introduced into the motor housing 210 through the suction port falls down to the lower side in the direction of gravity. This is due to the fact that it is concentrated on the noodles.

Accordingly, by arranging the inverter unit 400 so that one surface of the heat sink 432 is in contact with the lower outer surface of the motor unit 210 in the gravity direction, the cooling efficiency of the inverter 430 can be further improved as compared with the related art. .

At this time, one side of the inverter unit housing 410 is open so that the heat dissipation plate 432 of the inverter 430 may directly contact the lower outer surface of the motor unit housing 210 in the direction of gravity. It is preferable to be coupled along the bottom edge of the direction of gravity (210).

As the heat radiating plate 432, various types of heat radiating plates such as a corrugated heat radiating plate or a heat radiating plate laminated with a plurality of plates may be applied.

In addition, the inverter unit housing 410 is preferably made of aluminum or aluminum alloy having a good thermal conductivity, so as to facilitate cooling due to heat generation, but is not limited to this, it is possible to select a lightweight material with good thermal conductivity.

Hereinafter, a process of cooling the inverter in the vehicle electric compressor according to the first embodiment of the present invention will be described in detail.

First, the refrigerant is introduced into the motor housing 210 through the suction port, and the refrigerant introduced into the motor housing 210 through the suction port freely falls downward by gravity and simultaneously the compression unit housing 310. Cooling the motor 220 in the process of flowing to).

At this time, the refrigerant freely falling to the bottom surface of the motor unit 310 in the gravity direction transmits cooling heat to the heat sink 432 through the bottom surface of the motor unit 310 to cool the inverter 430.

That is, the heat generated by the inverter 430 is absorbed by the refrigerant accumulated in the bottom surface through the bottom bottom surface of the motor unit 210 in contact with the heat sink 432 and the heat sink 432, and thus, the inverter ( 430 may be sufficiently cooled, and thus, the cooling efficiency of the motor-driven compressor 100 is improved as compared with the related art.

Second Embodiment

3 is a cross-sectional view of a motor-driven compressor for a vehicle according to a second embodiment of the present invention.

The second embodiment of the present invention is similar to the first embodiment described above in that the compression unit 300 'and the motor unit 200' are arranged vertically and the inverter unit 400 ') are combined. Therefore, repeated description of the same configuration having the same function as the above-described first embodiment will be omitted.

The motor-driven compressor 100 ′ according to the second embodiment of the present invention includes a motor unit 200 ′, a compression unit 300 ′ coupled to an upper end of the motor unit 200 ′, and a compression unit 300 ′. An inverter unit 400 'coupled to the lower end of the motor unit 200' so as to face the motor unit 200 'and a heat sink 432' interposed between the motor unit 200 'and the inverter unit 400'.

Here, the compressor 100 'may further include a mounting part 500' formed on the outer circumferential surface of the motor part 200 'so that the compressor 100' may be assembled to one side of the engine, and a fastener such as a bolt is mounted to the mounting part 500 '. By assembling on one side of the engine, the compressor 100 'is mounted such that the rotary shaft 241' is vertically arranged as shown in FIG.

At this time, a motor 220 'having a rotating shaft 241' is installed in the motor unit 200 ', and a suction port for sucking refrigerant is formed on the outer circumferential surface of the motor unit 200'.

In addition, the compression unit 300 'is provided with a compression mechanism for compressing refrigerant by the operation of the motor 220', and the inverter unit 400 'has an inverter 430' for controlling the motor 220 '. Is accepted.

2, the rotating shaft 241 is installed horizontally with respect to the bottom surface of the vehicle, and the inverter unit 400 rotates in the radial direction of the rotating shaft 241, that is, On the outer circumferential surface of the 200).

3, the rotating shaft 241 'is installed perpendicular to the bottom surface of the vehicle, and the inverter unit 400' is disposed along the axial direction of the rotating shaft 241 ' The vehicle electric compressor 100 ′ of the type provided at the lower end of the motor unit 200 ′ is illustrated.

At this time, the heat sink 432 ′ is provided at the upper end of the inverter unit 400 ′ so that the upper side thereof faces the lower end of the motor unit 200 ′, and the coolant is accumulated at the lower end of the motor unit 200 ′, that is, below the gravity direction. The cooling efficiency of the inverter 430 'is improved by the cooling heat transferred from the heat sink 432' to the heat sink 432 '.

Third Embodiment

FIG. 4 is a cross-sectional view of a motor-driven compressor according to a third embodiment of the present invention, FIG. 5 is an arrangement view of a heat sink according to a third embodiment of the present invention, and FIG.

The compressor 100 "according to the third embodiment of the present invention is similar to the compressor 100 'according to the second embodiment described above and the rotating shaft 241" of the compressor 100 " In that it is installed horizontally with respect to the horizontal plane.

The motor-driven compressor 100 "for a vehicle according to the third embodiment of the present invention includes a motor unit 200", a compression unit 300 "coupled to one side of the motor unit 200", a motor unit 200 " And a heat sink 432 "interposed between the motor unit 200" and the inverter unit 400 ". The inverter unit 400 "

Here, the mounting unit 500 "may be further included on the outer circumferential surface of the motor unit 200" so that the compressor 100 "may be assembled on one side of the engine, and fasteners such as bolts may be mounted on the mounting unit 500". By assembling on one side of the engine, the compressor 100 "is mounted such that the rotary shaft 241" is disposed in a horizontal direction with respect to the vehicle floor surface as shown in FIG.

At this time, a motor 220 "having a rotating shaft 241" is provided inside the motor portion 200 ", and a suction port for suctioning the refrigerant is formed on the outer circumferential surface of the motor portion 200 ".

In addition, the compression unit 300 "is provided with a compression mechanism for compressing a refrigerant by the operation of the motor 220" inside the inverter unit 400 ", the inverter unit 400" inverter 430 "for controlling the motor 220". Is accepted.

In the second embodiment described above with reference to FIG. 3, the rotary shaft 241 ′ is installed perpendicular to the bottom surface of the vehicle, and the inverter unit 400 ′ is an axial lower end of the rotary shaft 241 ′, And is provided at the lower end of the motor unit 200 '.

In the compressor 100 ″ according to the third embodiment of the present invention illustrated in FIG. 4, the rotary shaft 241 ″ is installed horizontally with respect to the bottom surface of the vehicle, and the compression unit is disposed at one side of the motor unit 200 ″. Quot; and the inverter unit 400 "is coupled to the other side.

At this time, the heat sink 432 "is provided on one side of the surface facing the motor part 200" in the inverter part 400 ", the heat sink 432" lower than the suction port formed on the outer peripheral surface of the motor part 200 ". Is preferably installed.

In this case, the refrigerant flowing through the suction port on the upper portion of the heat sink 432 "flows across the heat sink 432" in the process of falling downward in the gravity direction, and the area of the heat sink 432 " By sufficiently ensuring the cooling efficiency of the inverter 430 "is improved. At this time, arrows indicated by a dashed line in the drawing indicate the flow of refrigerant.

Preferably, as shown in Fig. 5, at least two thirds of the area of the heat sink 432 "is preferably disposed at the lower end with respect to the central axis C of the rotary shaft 241 " In the case of the conventional heat sink 432a illustrated in FIG. 6, it can be seen that the contact area with the free-falling refrigerant increases.

100, 100 ', 100 ": compressor 200, 200', 200"
300, 300 ', 300 ": Compression unit 400, 400', 400": Inverter unit
430, 430 ', 430 ": inverter 432, 432', 432": heat sink

Claims (9)

A motor unit 200 having a rotating shaft 241 installed therein, and a suction port for suction of refrigerant formed on one side thereof;
A compression unit 300 coupled to one side of the motor unit 200 and provided with a compression mechanism for compressing a refrigerant by the operation of the motor 220;
An inverter unit 400 coupled to a lower end of an outer circumferential surface of the motor unit 200 and accommodating an inverter 430 for controlling the motor 220; And
And a heat dissipation plate (432) provided at one side of the inverter unit (400) and receiving coolant heat from a refrigerant flowing into the motor unit (200) and falling in a gravity direction.
The method according to claim 1,
Further comprising a mounting part (500) formed at one side of the outer circumferential surface of the motor part (200) and assembled to one side of the engine so that the rotating shaft (241) is horizontally arranged.
The heat sink according to claim 2, wherein the heat sink (432)
Is provided at an upper end of the inverter unit (400) so that an upper surface thereof faces a lower outer peripheral surface of the motor unit (200).
A motor unit 200 'in which a motor 220' having a rotating shaft 241 'is installed and a suction port for sucking refrigerant is formed at one side;
A compression unit 300 'coupled to an upper end of the motor unit 200' and provided with a compression mechanism for compressing a refrigerant by the operation of the motor 220 ';
An inverter 430 ′ coupled to the lower end of the motor unit 200 ′ facing the compression unit 300 ′ with the motor unit 200 ′ interposed therebetween and accommodated by the inverter 430 ′ for controlling the motor 220 ′ is accommodated. An inverter unit 400 '; And
And a heat dissipation plate (432 ') provided at one side of the inverter unit (400') and receiving coolant heat from a refrigerant flowing into the motor unit (200 ') and falling in a gravity direction.
The method of claim 4,
Is formed on one side of the outer peripheral surface of the motor portion (200 '), the vehicle electric compressor further comprises a mounting portion (500') is assembled on one side of the engine so that the rotary shaft (241 ') is disposed vertically.
[6] The heat sink according to claim 5,
Is provided at an upper end of the inverter unit (400 ') such that the upper side faces the lower end of the motor unit (200').
A motor unit 200 "in which a motor 220" having a rotating shaft 241 "is installed and a suction port for suctioning refrigerant is formed at one side;
A compression unit 300 '' coupled to one side of the motor unit 200 '' and having a compression mechanism for compressing the refrigerant by the operation of the motor 220 '';
An inverter unit 400 ″ coupled to the other side of the motor unit 200 ″ and accommodating an inverter 430 ″ for controlling the motor 220 ″;
A mounting portion 500 ″ formed at one side of the outer circumferential surface of the motor unit 200 ″ and assembled to one side of the engine such that the rotary shaft 241 ″ is horizontally disposed; and
A heat sink 432 ″ is provided at one side of the inverter unit 400 ″ opposite to the motor unit 200 ″ and receives cooling heat from the refrigerant flowing into the motor unit 200 ″. Automotive electric compressors.
The method of claim 7,
And the suction port is formed on the heat sink 432 ″ to allow the refrigerant sucked through the suction port to fall across the heat sink 432 ″ in the gravity direction.
The method of claim 8,
Wherein at least two thirds of the area of the heat sink 432 "is disposed at the lower end with respect to the central axis C of the rotary shaft 241 ".

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