JP4045121B2 - Electric compressor - Google Patents

Electric compressor Download PDF

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Publication number
JP4045121B2
JP4045121B2 JP2002143128A JP2002143128A JP4045121B2 JP 4045121 B2 JP4045121 B2 JP 4045121B2 JP 2002143128 A JP2002143128 A JP 2002143128A JP 2002143128 A JP2002143128 A JP 2002143128A JP 4045121 B2 JP4045121 B2 JP 4045121B2
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Japan
Prior art keywords
shield
part
housing
portion
electric compressor
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JP2002143128A
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Japanese (ja)
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JP2003328944A (en
Inventor
英夫 池田
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サンデン株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric compressor used in a vehicle air conditioner, and more particularly to an electric compressor in which an inverter circuit is accommodated in a housing.
[0002]
[Prior art]
An electric compressor that operates using a DC power source such as a battery houses a brushless motor (brushless DC motor) for driving a compression mechanism in a metal housing. This brushless motor is driven by a pulse train-like pseudo AC voltage converted by an inverter circuit, and its rotational speed is a method of changing the effective effective voltage by changing the duty ratio of the pseudo AC voltage based on a rotational speed command, It is controlled by PWM (pulse width modulation).
[0003]
Since the inverter circuit converts a DC voltage into a pulse train-like pseudo AC voltage having a predetermined duty ratio by ON / OFF driving of the semiconductor switching element, when the inverter circuit is installed outside the electric compressor, Electromagnetic noise generated in the inverter circuit and electromagnetic noise generated in the power supply line between this inverter circuit and the brushless motor are radiated to the outside, and this radiated noise causes malfunction of electronic devices mounted on the vehicle, audio There was a problem such as noise mixed in the output sound of the device.
[0004]
Therefore, recently, in order to prevent electromagnetic noise generated in the inverter circuit and electromagnetic noise generated in the power supply line between the inverter circuit and the brushless motor from being radiated to the outside, the inverter circuit is installed together with the brushless motor. What was accommodated in the metal housing is used as the said electric compressor.
[0005]
[Problems to be solved by the invention]
However, even in an electric compressor in which an inverter circuit is housed in a metal housing, the power supply line for supplying DC power from the DC power source to the inverter circuit in the housing is exposed to the outside. When the electromagnetic noise generated in step 1 is superimposed, the electromagnetic noise is radiated to the outside from the power supply line, causing the same problem as described above.
[0006]
The present invention has been created in view of the above circumstances, and an object of the present invention is to provide an electric motor that can prevent electromagnetic noise from being radiated from a power supply line that supplies DC power from a DC power source to an inverter circuit in a housing. It is to provide a compressor.
[0007]
[Means for Solving the Problems]
To achieve the above object, the present invention accommodates a motor for driving a compression mechanism and an inverter circuit for converting a DC voltage into a pulse train-like pseudo AC voltage and supplying the same to a motor. The electric compressor has two power input terminals projecting outside the housing so as to communicate with the inverter circuit in the housing, a clamping projection and flat portions provided on both sides of the clamping projection, A support portion integrally provided on the surface, a groove portion that allows insertion of a holding protrusion of the support portion, and a flange portion that is provided on both sides of the groove portion and can be brought into contact with two flat portions of the support portion, A metal cover in which a portion excluding the groove portion and the two flange portions has a U-shaped longitudinal section, a surface coating, a shield portion provided inside the surface coating, and two coating portions provided inside the shield portion; Each covering part And a shield wire for supplying DC power from a DC power source to the inverter circuit in the housing, and the shield wire is electrically connected to the two power input terminals, respectively. , The shield part is positioned on the clamping protrusion of the support part, and the cover is detachably fixed to the two flat parts of the support part, so that the inner surface of the groove part and the support part are clamped The shield portion of the shield wire is sandwiched between the protrusions and the shield portion is electrically connected to the housing, and the connection portion between the two core wires of the shield wire and the two power input terminals, the shield portion of the shield wire, and the housing It is characterized by covering the connecting part .
[0008]
According to this electric compressor, even when electromagnetic noise generated in the inverter circuit is superimposed on each core wire, the electromagnetic noise can be prevented from being radiated to the outside by the shield portion. In addition, since the shield portion is electrically connected to the housing so as to have the same potential as the housing, the noise emission can be effectively suppressed.
[0009]
The above object and other objects, structural features, and operational effects of the present invention will become apparent from the following description and the accompanying drawings.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show an embodiment of the present invention. FIG. 1 is a configuration diagram of a drive control system including an electric compressor, a power supply line, and a battery, and FIG. 2 is a diagram of the electric compressor shown in FIG. 3 is a partially broken side view of the electric compressor shown in FIG. 2, and FIG. 4 is an AA line enlarged cross-sectional view and a BB line enlarged cross-sectional view of FIG.
[0011]
1, reference numeral 1 denotes an electric compressor used in a vehicle air conditioner, 2 denotes a compression mechanism including a scroll type compression mechanism, 3 denotes a three-phase winding type brushless DC motor (hereinafter simply referred to as a brushless motor), 4 denotes Inverter circuit, 5 is a control circuit, 6 is a capacitor, 7 is a shield wire for power supply, and 8 is a battery mounted on the vehicle.
[0012]
The electric compressor 1 has a metal housing 9 as shown in FIG. The housing 9 is composed of three portions 9a to 9c connected by bolts or the like. The portion 9a has a built-in compression mechanism 2, and the portion 9b has a built-in brushless motor 3 for driving the compression mechanism 2. In the portion 9c, the inverter circuit 4 and the control circuit 5 are incorporated.
[0013]
Further, the electric compressor 1 has a suction port 10 and a discharge port 11 in the housing 9, and refrigerant used in the vehicle air conditioner is sent from the suction port 10 to the compression mechanism 2 through the brushless motor 3. After being compressed by the operation of the compression mechanism 2, it is sent out from the discharge port 11.
[0014]
The inverter circuit 4 includes a total of six semiconductor switching elements, and by turning these semiconductor switching elements on and off based on the PWM signal from the control circuit 5, the DC voltage is changed to a pulse train having a predetermined duty ratio. The AC voltage is converted and supplied to the brushless motor 3.
[0015]
The control circuit 5 has a microcomputer configuration and stores a duty ratio calculation program for performing speed control in accordance with the air conditioning load in the ROM. The control circuit 5 calculates a duty ratio suitable for the rotation speed command from an air conditioning control device (not shown) and sends a PWM signal corresponding to the duty ratio to the inverter circuit 4.
[0016]
The shield wire 7 is for supplying DC power from the battery 8 to the inverter circuit 4 in the housing 9 (9c). As shown in FIGS. 3 and 4, the shield wire 7 includes a surface coating 7a, a net-like shield portion 7b provided on the inner side, two coating portions 7c provided on the inner side, And a core wire 7d provided at the center of the covering portion 7c. As shown in FIG. 1, the two core wires 7 d are connected to the positive electrode and the negative electrode of the battery 8, and the other end of both is connected to the inverter circuit 4 via the capacitor 6. The capacitor 6 is intended to smooth the power supply and absorb the regenerative current from the brushless motor 3.
[0017]
Here, with reference to FIG. 3, FIG. 4 (A), and FIG. 4 (B), the connection structure of the shield wire 7 and the inverter circuit 4 is demonstrated.
[0018]
The housing 9 the support portion 12 have integrally on an outer surface of a portion 9b, the metal cover 13 with bolts 14 to the support portion 12 is removably attached.
[0019]
The support part 12 has a clamping protrusion 12a in the center, flat parts 12b on both sides thereof, and female screw holes 12c in each flat part 12b. On the other hand, the cover 13 has a groove portion 13a that allows the insertion of the clamping protrusion 12a in the center of the left side portion in FIG. 3, and has flange portions 13b that can contact the flat portion 12b on both sides thereof. The part 13b has a bolt insertion hole 13c. A portion of the cover 13 excluding the groove portion 13a and the flange portion 13b has a case shape with a U-shaped longitudinal section having the same height as the groove portion 13a and the same left-right dimension as the both flange portions 13b.
[0020]
In addition, two copper power supply input terminals 15 communicating with the inverter circuit 4 in the housing 9 are projected from a portion of the housing 9 covered with the cover 13. Two terminal rods 6a of the capacitor 6 are respectively inserted into holes (not shown) formed in the two power input terminals 15, and a copper L-shaped relay terminal 16 is formed on the protruding portion of each terminal rod 6a. The capacitor 6 and the relay terminal 16 are connected to the two power input terminals 15 by fastening nuts 17 to the protruding portions of the terminal rods 6a.
[0021]
When connecting the shield wire 7 to the electric compressor 1, first, the surface coating 7a of the shield wire 7 is partially removed to expose the shield portion 7b, and the two coating portions 7c are partially removed to remove the two core wires 7d. To expose. Then, the shield portion 7b is placed on the sandwiching protrusion 12a of the support portion 12, and the two core wires 7d are connected to the relay terminals 16 by a technique such as soldering. Then, the cover 14 is covered from above and the bolt 14 inserted into the bolt insertion hole 13c is screwed into the female screw hole 12c of the flat portion 12b.
[0022]
As a result, the shield portion 7 b of the shield wire 7 is sandwiched between the sandwiching protrusion 12 a of the support portion 12 and the inner surface of the groove portion 13 a of the cover 13, and the shield portion 7 b is electrically connected to the housing 9. Further, in the state where the cover 13 is attached to the housing 9, the cover 13, the support portion 12 and the housing 9 are in close contact with each other without a gap, and each connecting portion between the two core wires 7d and the two relay terminals 16 and the shield portion 7b. A connection portion of the housing 9 with the support portion 12 is covered by the cover 13, and the capacitor 6 is also located in the cover 13.
[0023]
As described above, the electric compressor 1 includes the two core wires 7d and the shield portion 7b covering the non-contact state as power supply lines for supplying DC power from the battery 8 to the inverter circuit 4 in the housing 9. The shielded wire 7 is used, the two core wires 7d of the shielded wire 7 are electrically connected to the two power input terminals 15 of the inverter circuit 4, respectively, and the shield portion 7b is electrically connected to the housing 9. Therefore, even if the electromagnetic noise generated in the inverter circuit 4 is superimposed on each core wire 7d, the electromagnetic noise can be prevented from being radiated to the outside by the shield portion 7b. Moreover, since the shield portion 7b is electrically connected to the housing 9 so as to have the same potential as the housing 9, the noise emission can be effectively suppressed.
[0024]
Further, in the electric compressor 1 described above, the connection portion between the two core wires 7d of the shield wire 7 and the two power input terminals 15 and the connection portion between the shield portion 7b and the housing 9 are covered by the cover 13. Therefore, electromagnetic noise is not radiated to the outside from the connection portions of the two power input terminals 15, the two relay terminals 16, the two relay terminals 16 and the two core wires 7d.
[0025]
Further, in the above-described electric compressor 1, the housing 9 and the cover 13 are provided with a portion (the sandwiching protrusion 12a and the groove portion 13a) for sandwiching the shield portion 7b by the cooperation of both, and the shield portion 7b is formed by the sandwiching. 9, the shield portion 7 b can be electrically connected to the housing 9 without using a joining method such as soldering, and the position adjustment of the shield wire 7 inside the cover 13 is prepared. Can do.
[0026]
Therefore, it is possible to reliably prevent electromagnetic noise from being radiated from the path connecting the battery 8 and the power input terminal 15 of the inverter circuit 4 without using a noise removing device such as a line filter, and causing noise emission. Problems that may occur, specifically, malfunctions such as malfunction of an electronic device mounted on a vehicle or noise mixed in output sound of an audio device can be solved.
[0027]
In the above description, the brushless motor 3 is exemplified as a motor for driving the compression mechanism 2, but other types of motors capable of PWM control, such as a reluctance motor and an induction motor, are appropriately used as the motor. it can.
[0028]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to prevent electromagnetic noise from being radiated from a power supply line that supplies DC power from a DC power supply to the inverter circuit in the housing.
[Brief description of the drawings]
1 is a configuration diagram of a drive control system including an electric compressor, a power supply line, and a battery according to an embodiment of the present invention. FIG. 2 is a side view of the electric compressor shown in FIG. FIG. 4 is a partially cutaway side view of the electric compressor shown in FIG. 2. FIG. 4 is an enlarged sectional view taken along line AA and an enlarged sectional view taken along line BB in FIG.
DESCRIPTION OF SYMBOLS 1 ... Electric compressor, 2 ... Compression mechanism, 3 ... Brushless motor, 4 ... Inverter circuit, 5 ... Control circuit, 6 ... Capacitor, 7 ... Shield wire, 7b ... Shield part, 7d ... Core wire, 8 ... Battery, 9 ... Housing, 10 ... Suction port, 11 ... Discharge port, 12 ... Supporting part, 12a ... Clamping projection, 13 ... Cover, 13a ... Groove part, 14 ... Bolt, 15 ... Power input terminal, 16 ... Relay terminal, 17 ... Terminal.

Claims (3)

  1. In an electric compressor in which a motor for driving a compression mechanism and an inverter circuit for converting a DC voltage into a pulse train-like pseudo AC voltage and supplying the motor to a motor are housed in a metal housing,
    Two power input terminals projecting outside the housing so as to communicate with the inverter circuit in the housing;
    A support portion provided integrally with the outer surface of the housing, having a holding protrusion and flat portions provided on both sides of the holding protrusion;
    It has a groove part that allows insertion of the holding protrusion of the support part and a flange part that is provided on both sides of the groove part and can contact each of the two flat parts of the support part, and the part other than the groove part and the two flange parts is vertically cut A metal cover that is U-shaped,
    A surface covering, a shield part provided inside the surface covering, two covering parts provided inside the shield part, and a core wire provided inside each covering part; A shield wire for supplying DC power to the inverter circuit of
    The shield wire is electrically connected to the two power input terminals of the two core wires, and the shield portion is located on the sandwiching protrusion of the support portion,
    The cover is detachably fixed to the two flat portions of the support portion on the two flange portions, and the shield portion of the shield wire is sandwiched between the inner surface of the groove portion and the holding protrusion of the support portion, and the shield portion is attached to the housing. It is electrically connected and covers the connection part between the two core wires of the shield wire and the two power input terminals and the connection part between the shield part of the shield wire and the housing.
    An electric compressor characterized by that.
  2. Two power supply input terminals are connected to two terminal rods of a capacitor, respectively, and the capacitor is covered with a cover.
    The electric compressor according to claim 1.
  3. The two core wires of the shielded wire are electrically connected to the two power input terminals via L-shaped relay terminals,
    The electric compressor according to claim 1 , wherein the electric compressor is provided.
JP2002143128A 2002-05-17 2002-05-17 Electric compressor Active JP4045121B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002143128A JP4045121B2 (en) 2002-05-17 2002-05-17 Electric compressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002143128A JP4045121B2 (en) 2002-05-17 2002-05-17 Electric compressor

Publications (2)

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JP2003328944A JP2003328944A (en) 2003-11-19
JP4045121B2 true JP4045121B2 (en) 2008-02-13

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4690769B2 (en) * 2005-05-16 2011-06-01 三菱重工業株式会社 Electric compressor for vehicles
JP2011236858A (en) * 2010-05-12 2011-11-24 Valeo Japan Co Ltd Earth connection structure of electric compressor
JP5683536B2 (en) 2012-06-08 2015-03-11 株式会社豊田自動織機 Electric compressor

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