JP2000295809A - Automotive air conditioners - Google Patents

Abstract

[PROBLEMS] To provide an automotive air conditioner equipped with a hermetic compressor driven by an inverter at a voltage of 60 V or less, which is capable of suppressing electromagnetic waves generated from the hermetic compressor. The purpose is to: SOLUTION: The electric motor 14 of the hermetic compressor 10 is
By covering with a magnetic material or a conductive material, the leakage of the electromagnetic wave radiated from the electric motor 14 is suppressed, and the electromagnetic wave generated from the hermetic compressor is suppressed. For example, the hermetic container 12 of the hermetic compressor is formed of a magnetic material or a conductive material. Further, by applying a conductive paint or a magnetic paint 26 to the closed container, generation of electromagnetic waves is further suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner having a hermetic compressor driven by a battery.

[0002]

2. Description of the Related Art In recent years, an air conditioner equipped with a hermetic compressor for an electric vehicle or a hybrid car has been actively developed.

[0003] The hermetic compressor includes an electric motor that rotates by receiving power supply from a battery, and compresses refrigerant gas of an air conditioner by using the power of the electric motor. Conventional electric vehicles or hybrid cars are equipped with 15 to 25 DC12V batteries, so the hermetic compressor has 2
A voltage of 00 to 300 V was supplied.

However, recently, in addition to electric vehicles or hybrid cars, research into practical use of a system in which an engine is used only for traveling and mechanisms such as a power steering and a compressor are all powered by increasing a power supply voltage is also urgent. At a pitch, there is a movement to reduce the total voltage of the battery to a maximum of DC 60 V or less from the viewpoint of safety.

[0005]

However, when the hermetic compressor is driven at a low voltage of DC 60 V or less, it is necessary to flow a large current of 50 A or more in order to secure the same output as the conventional one. When such a large current is applied to the hermetic compressor driven by the inverter, the following problem occurs.

FIG. 5A is a schematic diagram showing an electric circuit of an air conditioner for a vehicle equipped with a hermetic compressor driven by an inverter. The power output from the battery 56 is supplied to the hermetic compressor 10 through the inverter circuit 58. The voltage supplied from the inverter circuit 58 to the hermetic compressor 10 is 10 to 50 H as shown in FIG.
The waveform has a high frequency pulse of 5 to 20 kHz superimposed on a low frequency pulse of z. Therefore, the hermetic compressor 10
5 to 20 kHz as shown in FIG.
It has a high frequency component of z. Therefore, when a large current exceeding 50 A flows, a strong electromagnetic wave is radiated based on the high-frequency component of the current. In particular, the hermetic compressor 10
Very strong electromagnetic wave noise is radiated from the coil portion of the internal motor 14. When strong electromagnetic waves are radiated from the hermetic compressor 10, there is a possibility that a malfunction of a control system of an automobile may occur.

[0007] Therefore, the present invention provides a 6-bit inverter.
It is an object of the present invention to provide an automotive air conditioner provided with a hermetic compressor driven at 0 V or less, which can suppress electromagnetic waves generated from the hermetic compressor.

[0008]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 of the present invention relates to an air conditioner for a vehicle equipped with a hermetic compressor driven at 60 V or less by an inverter. The electric motor of the hermetic compressor is covered with a magnetic material.

The invention according to claim 2 is characterized in that the hermetic container of the hermetic compressor is made of a magnetic material.

Further, the invention according to claim 3 is characterized in that the relative permeability of the magnetic material is 1,000 or more.

Further, the invention according to claim 4 is characterized in that the magnetic material is an iron-based magnetic material.

According to a fifth aspect of the present invention, in the vehicle air conditioner according to the third aspect, the iron-based magnetic material contains 5% by weight or more of nickel.

Further, the invention according to claim 6 is characterized in that the iron-based magnetic material contains 0.2 to 3.0% by weight of silicon.

Further, the invention according to claim 7 is characterized in that the electric motor of the hermetic compressor is further covered with a conductive paint.

The invention according to claim 8 is an air conditioner for a vehicle equipped with a hermetic compressor driven at 60 V or less by an inverter, wherein the electric motor of the hermetic compressor is covered with a conductive material. It is characterized by the following.

Further, the invention according to claim 9 is characterized in that the hermetic container of the hermetic compressor is made of a conductive material.

Still further, the invention according to claim 10 is as follows.
The conductive material is a metal containing copper or aluminum.

In addition, the invention according to claim 11 is characterized in that the electric motor of the hermetic compressor is further covered with a magnetic paint.

Further, the invention according to claim 12 is characterized in that the closed container is connected to ground.

According to a thirteenth aspect of the present invention, there is provided an air conditioner for a vehicle having a hermetic compressor driven by an inverter at a voltage of 60 V or less, wherein the hermetic compressor is provided outside the hermetic container. The input terminal is covered with a conductive material or a magnetic material via an insulating layer.

Further, the invention according to claim 14 is characterized in that the insulating terminal cover covering the electric input terminal is covered with a conductive paint or a magnetic paint.

Still further, the invention according to claim 15 is characterized in that the electric wiring connecting the electric input terminal and the inverter is a shield wire.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a cross-sectional view illustrating an example of a hermetic compressor in an automotive air conditioner according to a first embodiment. The hermetic compressor 10 has a hermetic container 12 to which a suction pipe 20 and a discharge pipe 22 are connected. In the hermetic container 12, an electric motor 14 and a compression mechanism 16 are arranged. When the electric motor 14 receives electric power from the outside and rotates, the compression mechanism 16 connected to the electric motor 14 operates to compress the refrigerant gas sucked from the suction pipe 20 and discharge it from the discharge pipe 22.

The motor 14 is supplied with power from an inverter (not shown) via an input terminal 24. Since the power supplied from the inverter has a high frequency component of 5 to 20 kHz, when a large current of 50 A or more flows, strong electromagnetic wave noise is radiated from the electric motor 14. If the electromagnetic wave radiated from the electric motor 14 leaks out of the hermetic compressor 10, other electronic control devices arranged in the vehicle together with the hermetic compressor 10 may malfunction.

Therefore, in the present embodiment, leakage of electromagnetic waves radiated from the motor 14 to the outside of the compressor is suppressed by covering the motor 14 with a magnetic material. The magnetic material covering the electric motor 14 interacts with the magnetic field component of the electromagnetic wave passing therethrough to attenuate the electromagnetic wave, so that the leakage of the electromagnetic wave radiated from the electric motor 14 to the outside can be suppressed.

In order to cover the electric motor 14 with a magnetic material, various methods such as covering with a sheet made of a magnetic material or covering with a box made of a magnetic material can be adopted. To cover the electric motor 14 with a magnetic material. According to this method, the electric motor 14 can be covered with the magnetic material without using a new member.

In the present invention, the magnetic material refers to a material having a magnetic permeability capable of attenuating an electromagnetic wave passing through the material. The magnetic material used in the present invention is preferably a ferromagnetic material. Further, in order to effectively shield the electromagnetic waves radiated from the motor 14, the relative permeability of the magnetic material is set to 1000.
It is preferable that it is above.

Examples of the magnetic material include various transition metals and alloys or compounds containing the transition metal. From the viewpoint of economy, it is preferable to use an iron-based magnetic material.
The iron-based magnetic material refers to iron or an alloy or compound containing iron having a high magnetic permeability.

It is preferable to add nickel or silicon to the iron-based magnetic material. This is because nickel and silicon increase the magnetic permeability of the iron-based magnetic material. The content of nickel is preferably 5% by weight or more, more preferably 35 to 80% by weight. On the other hand, the content of silicon is 0.1.
Preferably it is 2 to 3.0% by weight. This is because if the silicon content is too large, the moldability of the iron-based magnetic material deteriorates. Although the magnetic permeability of the iron-based magnetic material can be increased by adding cobalt, the effect of improving the magnetic permeability is small compared to the addition of nickel or silicon. Excessive addition of manganese and chromium exceeding 10% by weight is not preferable because the metal structure of the iron-based magnetic material becomes austenite and loses magnetism.

Further, in addition to the above magnetic material, the electric motor 14
Is preferably further covered with a conductive paint 26. Since the magnetic material 12 acts on the magnetic field component of the electromagnetic wave and the conductive paint 26 acts on the electric field component of the electromagnetic wave, the electromagnetic wave radiated from the electric motor 14 can be further attenuated.

In order to cover the electric motor 14 with the conductive paint 26, in the present embodiment, the conductive paint 26 is applied to the outside of the closed container 12. The conductive paint 26 is
It may be applied as long as it is applied so as to cover the electric motor 14, and may be applied to the inside of the closed container 12 or directly to the electric motor 14.

In the present invention, the conductive paint refers to a paint having electrical conductivity capable of attenuating electromagnetic waves passing through the paint. As the conductive paint 26, composite paints of various conductive materials and resins can be used, but from the viewpoint of economy,
It is preferable to use a dispersion of copper or aluminum powder in a general paint such as enamel.

Second Embodiment FIG. 2 is a sectional view showing an example of a hermetic compressor in an automotive air conditioner according to a second embodiment. The hermetic compressor 30 has a hermetic container 32 to which a suction pipe 40 and a discharge pipe 42 are connected. In the hermetic container 32, an electric motor 34 and a compression mechanism 36 are provided. Note that the electric input terminals are omitted in FIG. The operation of the hermetic compressor 30 is the same as that of the compressor 10 in the first embodiment. When a large current is supplied, a strong electromagnetic wave is radiated from the electric motor 34.

In the present embodiment, leakage of electromagnetic waves is suppressed by covering electric motor 34 with a conductive material. Various methods can be used to cover the electric motor 34 with the conductive material, but for the same reason as the magnetic material in the first embodiment,
It is preferable that the closed container 32 covering the electric motor 34 is formed of a conductive material.

As the conductive material, any general metal material can be used, but from the viewpoint of economy, it is preferable to use a metal containing aluminum or copper. The metal containing aluminum or copper is, for example, simple aluminum, simple copper, various aluminum alloys, brass, or the like.

It is preferable that the electric motor 34 be further covered with a magnetic paint 46 in addition to the conductive material. The magnetic paint refers to a paint having a magnetic permeability capable of attenuating an electromagnetic wave passing through the paint. Since the conductive material 32 acts on the electric field component of the electromagnetic wave and the magnetic paint 46 acts on the magnetic field component of the electromagnetic wave, the electromagnetic wave radiated from the electric motor 34 can be further attenuated.

In order to cover the electric motor 34 with the magnetic paint 46,
In the present embodiment, the magnetic paint 46 is applied to the outside of the closed container 32. The magnetic paint 46 is used for the electric motor 3.
4 may be applied so as to cover the inside of the closed container 32 or may be applied directly to the electric motor 34.

As the magnetic paint 46, for example, a magnetic material powder such as iron or nickel dispersed in a general paint such as enamel can be used.

When the closed container 32 is made of a conductive material, it is preferable to connect the closed container 32 to ground. With the ground connection, the electromagnetic waves passing through the closed container 32 can be further attenuated. For example, as shown in FIG. 2, the ground connection can be performed by screwing the ground connection wiring 48 to the sealed container 32.

Embodiment 3 Electric power is supplied to an electric motor 14 of the hermetic compressor shown in FIG. Since electromagnetic waves can be radiated from a conductor through which a high-frequency large current flows, the electric motor 1
Electromagnetic waves are radiated from the electric input terminal 24 as well as the electric input terminal 4. On the other hand, since the electric input terminal 24 is provided outside the closed container 12, depending on the configuration shown in FIG.
The leakage of the electromagnetic wave radiated from the electric input terminal 24 cannot be suppressed.

Therefore, in the present embodiment, leakage of the electromagnetic wave radiated from the electric input terminal 24 is suppressed by covering the electric input terminal 24 itself with a conductive material via an insulating layer.

FIGS. 3 and 4 are top views showing a part of the hermetic compressor of the automotive air conditioner according to the present embodiment (FIG. 3).
(A)), a side view (FIG. 3 (b)), and a sectional view along the line AA ′ (FIG. 4). An electric input terminal 24 is provided outside the closed casing 12 and is covered by an insulating terminal cover 50. The terminal cover 50 is screwed to the column 23 by a nut 52. The electric input terminal 24 is connected to an electric wiring 54 (not shown in FIG. 4) for connecting to an inverter (not shown).

In order to cover the electric input terminal 24 with a conductive material, in the present embodiment, a conductive paint 51 is applied to the outside of the insulating terminal cover 50. Thereby, the electromagnetic wave radiated from the electric input terminal 24 can be attenuated by the conductive paint 51.

Note that any other structure may be used as long as the electric input terminal 24 can be covered with a conductive material via an insulating layer. For example, a conductive paint may be applied to the inside of the insulating terminal cover 50 instead of the outside. Also,
The electric input terminal 24 may be covered with an insulating material and then wrapped with a conductive sheet or the like.

The electric input terminal 24 may be covered with a magnetic material instead of the conductive material. For example, instead of the conductive paint 51, a magnetic paint is used instead of the insulating terminal cover 50.
, The electric input terminal can be covered with a magnetic material.

The electric wiring 54 connected to the electric input terminal 24 is preferably a shielded wire. Since a high-frequency large current also flows through the electric wiring 54, the electric wiring 54
This is because an electromagnetic wave can be radiated from the device.

Although FIGS. 1 to 5 show a specific type of hermetic compressor as an example, the present invention is not limited to these. The hermetic compressor may be a vertical type or a horizontal type, and the electric motor disposed in the compressor may be an induction motor or a magnet motor.

[0048]

The present invention has the following effects because it is configured as described above. According to the first aspect of the present invention, the motor of the hermetic compressor is
Since it is covered with the magnetic material, it is possible to suppress the leakage of the electromagnetic wave radiated from the electric motor and suppress the electromagnetic wave generated from the hermetic compressor.

According to the second aspect of the present invention, since the hermetic container of the hermetic compressor is made of a magnetic material, it is possible to suppress electromagnetic waves generated from the hermetic compressor without using a new member. Can be.

According to the third aspect of the present invention,
Since the relative magnetic permeability of the magnetic material is 1000 or more, electromagnetic waves generated from the hermetic compressor can be further suppressed.

According to the fourth aspect of the present invention, by using an iron-based magnetic material for the magnetic material,
Electromagnetic waves generated from the hermetic compressor can be economically suppressed.

[0052] In addition, according to the invention of claim 5,
Since the iron-based magnetic material contains nickel in an amount of 5% by weight or more, electromagnetic waves generated from the hermetic compressor can be further suppressed.

Further, according to the invention described in claim 6,
The iron-based magnetic material contains silicon in an amount of 0.2 to 3.0% by weight.
Therefore, the electromagnetic waves generated from the hermetic compressor can be further suppressed.

According to the seventh aspect of the present invention, since the electric motor of the hermetic compressor is further covered with the conductive paint, electromagnetic waves generated from the hermetic compressor can be further suppressed. .

According to the eighth aspect of the present invention, since the electric motor of the hermetic compressor is covered with a conductive material, the leakage of electromagnetic waves radiated from the electric motor is suppressed, and the motor is generated from the hermetic compressor. Electromagnetic waves can be suppressed.

Further, according to the ninth aspect of the present invention,
Since the hermetic container covering the electric motor of the hermetic compressor is made of a conductive material, it is possible to suppress electromagnetic waves generated from the hermetic compressor without using a new member.

According to the tenth aspect of the present invention, by using a metal containing copper or aluminum as the conductive material, it is possible to economically suppress electromagnetic waves generated from the hermetic compressor.

In addition, according to the eleventh aspect of the present invention, since the electric motor of the hermetic compressor is further covered with the magnetic paint, the electromagnetic waves generated from the hermetic compressor can be further suppressed.

Further, according to the twelfth aspect of the present invention, since the closed container made of the conductive material is connected to the ground, the electromagnetic waves generated from the closed compressor can be further suppressed.

According to the thirteenth aspect of the present invention, since the electric input terminal provided outside the hermetic container of the hermetic compressor is covered with a conductive material or a magnetic material via an insulating layer,
Suppress the leakage of electromagnetic waves radiated from the electrical input terminal,
Electromagnetic waves generated from the hermetic compressor can be suppressed.

Further, according to the fourteenth aspect of the present invention,
Since the insulating terminal cover covering the electric input terminal is covered with a conductive paint or a magnetic paint, it is possible to suppress electromagnetic waves generated from the hermetic compressor without using a new member.

Further, according to the present invention, since the electric wiring connecting the electric input terminal and the inverter is a shield wire, the electromagnetic wave generated from the hermetic compressor can be further suppressed. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing a hermetic compressor in an automotive air conditioner according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a hermetic compressor in an automotive air conditioner according to a second embodiment of the present invention.

FIG. 3 is a (a) top view and (b) a side view showing a hermetic compressor in an automotive air conditioner according to a third embodiment of the present invention.

FIG. 4 is a sectional view taken along line AA ′ of the hermetic compressor in the air conditioner for a vehicle according to Embodiment 3 of the present invention.

FIG. 5A is a schematic diagram showing an electric circuit of an automotive air conditioner including a hermetic compressor driven by an inverter. (B) and (c) are graphs showing a voltage waveform and a current waveform at an input portion of the electric circuit shown in FIG. 5 (a) to the hermetic compressor.

[Explanation of symbols]

10 and 30 hermetic compressors, 12 and 32 hermetic containers, 14 and 34 electric motors, 16 and 36 compression mechanisms, 18 and 38 shafts, 20 and 40 suction pipes,
22 and 42 discharge pipe, 24 electric input terminal, 26 and 51 conductive paint, 46 magnetic paint, 48 ground wire,
50 Insulating terminal cover, 52 Nut, 54
Electrical wiring, 56 batteries, 58 inverters.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuyuki Nishii 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Jun Funami 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd.

Claims (15)

[Claims] 1. An air conditioner for a vehicle having a hermetic compressor driven by an inverter at a voltage of 60 V or less, wherein the motor of the hermetic compressor is covered with a magnetic material. . 2. The air conditioner for an automobile according to claim 1, wherein the hermetic container of the hermetic compressor is made of a magnetic material. 3. The air conditioner according to claim 1, wherein the relative permeability of the magnetic material is 1000 or more. 4. The automotive air conditioner according to claim 1, wherein said magnetic material is an iron-based magnetic material. 5. The automotive air conditioner according to claim 4, wherein the iron-based magnetic material contains nickel in an amount of 5% by weight or more. 6. The method according to claim 1, wherein the iron-based magnetic material contains 0.2% of silicon.
The automotive air conditioner according to claim 4, wherein the content of the air conditioner is from 3.0 to 3.0% by weight. 7. The automotive air conditioner according to claim 1, wherein the electric motor of the hermetic compressor is further covered with a conductive paint. 8. An air conditioner for a vehicle equipped with a hermetic compressor driven by an inverter at a voltage of 60 V or less, wherein the motor of the hermetic compressor is covered with a conductive material. . 9. The air conditioner for an automobile according to claim 8, wherein the closed container of the closed type compressor is made of a conductive material. 10. The air conditioner according to claim 8, wherein the conductive material is a metal containing copper or aluminum. 11. The air conditioner according to claim 8, wherein the electric motor of the hermetic compressor is further covered with a magnetic paint. 12. The air conditioner for a vehicle according to claim 9, wherein said closed container is connected to ground. 13. An automotive air conditioner provided with a hermetic compressor driven by an inverter at a voltage of 60 V or less, wherein an electric input terminal disposed outside a hermetic container of the hermetic compressor is connected via an insulating layer. An air conditioner for an automobile, wherein the air conditioner is covered with a conductive material or a magnetic material. 14. The air conditioner for an automobile according to claim 13, wherein the insulating terminal cover covering the electric input terminal is covered with a conductive paint or a magnetic paint. 15. The air conditioner for a vehicle according to claim 13, wherein the electric wiring connecting the electric input terminal and the inverter is a shield line.