JP2020167776A - Motor compressor - Google Patents

Abstract

To provide a motor compressor capable of securing a mounting area of Y capacitors in a circuit board which is accommodated in an inverter housing chamber and on which a common mode choke coil and multiple Y capacitors are mounted.SOLUTION: A common mode choke coil 34 is mounted on a circuit board 29 and disposed along a sidewall 83 of a housing chamber S0 and adjacently to a screw 81, and multiple chip capacitors C1, C2 and C3 are mounted on the circuit board 29 and positioned between a lead wire 70b of the common mode choke coil 34 and the screw 81 on an electric circuit. The common mode choke coil 34 extends from a position where the lead wire 70b is held between a first winding part 90 and a second winding part 91, to the circuit board 29. The multiple chip capacitors C1, C2 and C3 are positioned so as to be settled within a projection plane of the common mode choke coil 34 with respect to the circuit board 29.SELECTED DRAWING: Figure 3

Description

The present invention relates to an electric compressor.

The electric compressor disclosed in Patent Document 1 includes a compression unit, an electric motor, and a drive circuit. The drive circuit includes a filter circuit inserted into a power supply line and an inverter circuit that receives electric power from the power supply line via the filter circuit. And a circuit board on which the inverter circuit is arranged. The filter circuit has a coil and a damping resistor, and the damping resistor is cooled by the intake refrigerant of the electric compressor.

JP-A-2015-48800

In recent years, the demand for EMC in electric compressors has increased, and as a result, the coil, which is a filter component, has become larger. In addition, there is a demand for handling higher voltage and larger current, and the switching element (IPM) is also becoming larger. Due to these backgrounds, the coil has to be placed at the edge of the board and at the end of the inverter housing chamber, the distance between the coil and the board fastening member for grounding is shortened, and there is room for arranging multiple Y capacitors in series. Absent.

An object of the present invention is to provide an electric compressor which is arranged in an inverter accommodating chamber and can secure a mounting area for a Y capacitor on a circuit board on which a common mode choke coil and a plurality of Y capacitors are mounted.

An electric compressor for solving the above problems is an electric compressor in which a compression unit and an electric motor are housed in a housing and an inverter device is housed in an inverter storage chamber. The inverter device is a circuit board and an electric compressor. A fastening member having conductivity and fastening the circuit board to the housing, the wiring pattern of the circuit board and the housing while being electrically connected, and the inverter mounted on one surface of the circuit board. A common mode choke coil arranged along the side wall of the accommodation chamber and adjacent to the fastening member, and the lead wire of the common mode choke coil mounted on the other surface of the circuit board and fastened to the lead wire of the common mode choke coil on the electric circuit. The common mode choke coil includes a plurality of Y capacitors located between the members, and the first winding portion in which the first winding is wound without a gap and the second winding are wound without a gap. It has a second winding portion that has been turned, and the lead wire extends from a position sandwiched between the first winding portion and the second winding portion toward the circuit board, and the plurality of Y capacitors The gist is that the coil is positioned so as to be within the projection plane of the common mode choke coil with respect to the circuit board.

According to this, the lead wire of the common mode choke coil extends from the position sandwiched between the first winding portion and the second winding portion toward the circuit board, and the plurality of Y capacitors are common mode chokes with respect to the circuit board. It is located so that it fits within the projection plane of the coil. Therefore, it is possible to secure the mounting area of the Y capacitor on the circuit board arranged in the inverter accommodating chamber and on which the common mode choke coil and the plurality of Y capacitors are mounted.

According to the present invention, it is possible to secure the mounting area of the Y capacitor on the circuit board arranged in the inverter accommodation chamber and on which the common mode choke coil and the plurality of Y capacitors are mounted.

The schematic diagram which shows the outline of the electric compressor for a vehicle. Circuit diagram of drive unit and electric motor. The front view which shows the inverter device with the cover removed. The front view which shows the inverter device without a cover and a circuit board. (A) is a partial front view of the inverter device, and (b) is a cross-sectional view taken along the line AA of (a). (A) is a plan view of the common mode choke coil, (b) is a left side view of the common mode choke coil, and (c) is a cross-sectional view taken along the line AA of (a). (A) is a plan view of the common mode choke coil in the comparative example, and (b) is a side view of the common mode choke coil. A partial front view of the inverter device in the comparative example.

Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. The in-vehicle electric compressor of the present embodiment includes a compression unit that compresses a refrigerant as a fluid, and is used in an in-vehicle air conditioner. That is, the fluid to be compressed by the in-vehicle electric compressor in the present embodiment is a refrigerant.

As shown in FIG. 1, the vehicle-mounted air conditioner 10 includes an vehicle-mounted electric compressor 11 and an external refrigerant circuit 12 that supplies a refrigerant as a fluid to the vehicle-mounted electric compressor 11. The external refrigerant circuit 12 includes, for example, a heat exchanger and an expansion valve. The in-vehicle air conditioner 10 cools and heats the inside of the vehicle by compressing the refrigerant by the in-vehicle electric compressor 11 and exchanging heat and expanding the refrigerant by the external refrigerant circuit 12.

The in-vehicle air conditioner 10 includes an air conditioner ECU 13 that controls the entire in-vehicle air conditioner 10. The air conditioning ECU 13 is configured to be able to grasp the temperature inside the vehicle, the set temperature of the car air conditioner, and the like, and transmits various commands such as an ON / OFF command to the in-vehicle electric compressor 11 based on these parameters.

The in-vehicle electric compressor 11 includes a housing 14 in which a suction port 14a for sucking a refrigerant from an external refrigerant circuit 12 is formed.
The housing 14 is made of a heat-conducting material (for example, a metal such as aluminum). The housing 14 is grounded to the body of the vehicle.

The housing 14 has a suction housing 15 and a discharge housing 16 assembled to each other. The suction housing 15 has a bottomed tubular shape that opens in one direction, and has a plate-shaped bottom wall portion 15a and a side wall portion 15b that stands up from the peripheral portion of the bottom wall portion 15a toward the discharge housing 16. There is. The bottom wall portion 15a has a substantially plate shape, for example, and the side wall portion 15b has a substantially tubular shape, for example. The discharge housing 16 is assembled to the suction housing 15 with the opening of the suction housing 15 closed. As a result, an internal space is formed in the housing 14.

The suction port 14a is formed on the side wall portion 15b of the suction housing 15. Specifically, the suction port 14a is arranged on the bottom wall portion 15a side of the side wall portion 15b of the suction housing 15 with respect to the discharge housing 16.

The housing 14 is formed with a discharge port 14b for discharging the refrigerant. The discharge port 14b is formed at a portion of the discharge housing 16, specifically, the discharge housing 16 facing the bottom wall portion 15a.

The in-vehicle electric compressor 11 includes a rotating shaft 17, a compression unit 18, and an electric motor 19 housed in a housing 14.
The rotating shaft 17 is rotatably supported with respect to the housing 14. The rotating shaft 17 is arranged so that its axial direction coincides with the thickness direction of the plate-shaped bottom wall portion 15a (in other words, the axial direction of the tubular side wall portion 15b). The rotating shaft 17 and the compression unit 18 are connected to each other.

The compression portion 18 is arranged on the discharge port 14b side of the suction port 14a (in other words, the bottom wall portion 15a) in the housing 14. The compression unit 18 compresses the refrigerant sucked into the housing 14 from the suction port 14a by rotating the rotating shaft 17, and discharges the compressed refrigerant from the discharge port 14b. The specific configuration of the compression unit 18 is arbitrary, such as a scroll type, a piston type, and a vane type.

The electric motor 19 is arranged between the compression portion 18 and the bottom wall portion 15a in the housing 14. The electric motor 19 drives the compression unit 18 by rotating the rotating shaft 17 in the housing 14. The electric motor 19 has, for example, a cylindrical rotor 20 fixed to a rotating shaft 17 and a stator 21 fixed to a housing 14. The stator 21 has a cylindrical stator core 22 and a coil 23 wound around a tooth formed on the stator core 22. The rotor 20 and the stator 21 face each other in the radial direction of the rotating shaft 17. When the coil 23 is energized, the rotor 20 and the rotating shaft 17 rotate, and the compressor 18 compresses the refrigerant.

As shown in FIG. 1, the in-vehicle electric compressor 11 drives a drive device 24 for driving an electric motor 19 to which DC power is input, and a cover 25 for partitioning a storage chamber S0 for accommodating the drive device 24. And have.

The cover 25 is made of a non-magnetic conductive material (for example, a metal such as aluminum) having heat conductivity.
The cover 25 has a bottomed tubular shape that opens toward the bottom wall portion 15a of the housing 14, specifically the suction housing 15. The cover 25 is attached (joined) to the bottom wall portion 15a of the housing 14 by bolts 26 in a state where the open end is abutted against the bottom wall portion 15a. The opening of the cover 25 is closed by the bottom wall portion 15a. The accommodation chamber S0 is formed by the cover 25 and the bottom wall portion 15a.

The accommodation chamber S0 is arranged outside the housing 14, and is arranged on the side opposite to the electric motor 19 with respect to the bottom wall portion 15a. The compression unit 18, the electric motor 19, and the drive device 24 are arranged in the axial direction of the rotating shaft 17.

The cover 25 is provided with a connector 27, and the drive device 24 is electrically connected to the connector 27. DC power is input to the drive device 24 from the vehicle-mounted power storage device 28 mounted on the vehicle via the connector 27, and the air conditioning ECU 13 and the drive device 24 are electrically connected. The in-vehicle power storage device 28 is a DC power source mounted on a vehicle, and is, for example, a secondary battery or a capacitor.

As shown in FIG. 1, the drive device 24 includes an inverter device 30. The inverter device 30 includes a circuit board 29. As shown in FIG. 2, the connector 27 and the inverter device 30 are electrically connected by two connection lines EL1 and EL2.

As shown in FIG. 1, the circuit board 29 has a plate shape. The circuit board 29 is arranged to face the bottom wall portion 15a in the axial direction of the rotating shaft 17.
The inverter device 30 is for driving the electric motor 19. The inverter device 30 includes an inverter circuit 31 (see FIG. 2) and a noise reduction unit 32 (see FIG. 2). The inverter circuit 31 is for converting DC power into AC power. The noise reduction unit 32 is provided on the input side of the inverter circuit 31 and is for reducing common mode noise and normal mode noise included in the DC power before being input to the inverter circuit 31.

Next, the electrical configuration of the electric motor 19 and the drive device 24 will be described.
As shown in FIG. 2, the coil 23 of the electric motor 19 has a three-phase structure including, for example, a u-phase coil 23u, a v-phase coil 23v, and a w-phase coil 23w. The coils 23u to 23w are, for example, Y-connected.

The inverter circuit 31 includes u-phase switching elements Qu1 and Qu2 corresponding to the u-phase coil 23u, v-phase switching elements Qv1 and Qv2 corresponding to the v-phase coil 23v, and w-phase switching elements Qw1 and w corresponding to the w-phase coil 23w. It is equipped with Qw2. Each switching element Qu1 to Qw2 is a power switching element such as an IGBT. The switching elements Qu1 to Qw2 have a freewheeling diode (body diode) Du1 to Dw2.

The u-phase switching elements Qu1 and Qu2 are connected in series with each other via a connecting line, and the connecting line is connected to the u-phase coil 23u. The series connection of each u-phase switching element Qu1 and Qu2 is electrically connected to both connection lines EL1 and EL2, and the DC power from the in-vehicle power storage device 28 is input to the series connection. ing.

The other switching elements Qv1, Qv2, Qw1, and Qw2 have the same connection mode as the u-phase switching elements Qu1 and Qu2, except that the corresponding coils are different.

The drive device 24 includes a control unit 33 that controls the switching operation of each switching element Qu1 to Qw2. The control unit 33 can be realized, for example, by one or more dedicated hardware circuits and / or one or more processors (control circuits) that operate according to a computer program (software). The processor includes a CPU and a memory such as a RAM and a ROM, and the memory stores, for example, a program code or a command configured to cause the processor to execute various processes. Memory or computer-readable media includes any available medium accessible by a general purpose or dedicated computer.

The control unit 33 is electrically connected to the air conditioning ECU 13 via the connector 27, and periodically turns on / off the switching elements Qu1 to Qw2 based on a command from the air conditioning ECU 13. Specifically, the control unit 33 performs pulse width modulation control (PWM control) of each switching element Qu1 to Qw2 based on a command from the air conditioning ECU 13. More specifically, the control unit 33 generates a control signal by using the carrier signal (carrier signal) and the command voltage value signal (comparison target signal). Then, the control unit 33 converts DC power into AC power by performing ON / OFF control of each switching element Qu1 to Qw2 using the generated control signal.

The noise reduction unit 32 includes a common mode choke coil 34 and an X capacitor 35. The X capacitor 35 as a smoothing capacitor constitutes a low-pass filter circuit 36 together with the common mode choke coil 34. The low-pass filter circuit 36 is provided on the connection lines EL1 and EL2. The low-pass filter circuit 36 is circuit-wise provided between the connector 27 and the inverter circuit 31.

The common mode choke coil 34 is provided on both connection lines EL1 and EL2.
The X capacitor 35 is provided in the subsequent stage (inverter circuit 31 side) with respect to the common mode choke coil 34, and is electrically connected to both connection lines EL1 and EL2. An LC resonance circuit is composed of a common mode choke coil 34 and an X capacitor 35. That is, the low-pass filter circuit 36 of the present embodiment is an LC resonance circuit including the common mode choke coil 34.

Both Y capacitors 37 and 38 are connected in series with each other. Specifically, the drive device 24 includes a bypass line EL3 that connects one end of the first Y capacitor 37 and one end of the second Y capacitor 38. The bypass line EL3 is grounded to the body of the vehicle.

The Y capacitor 37 is composed of three chip capacitors C1, C2, and C3 connected in series. The Y capacitor 38 is composed of three chip capacitors C4, C5 and C6 connected in series. The reason why the Y capacitor is composed of a plurality of capacitors (chip capacitors) connected in series is that even if the withstand voltage of the Y capacitor is high, a capacitor with a low withstand voltage (chip capacitor) may be connected in series.

Further, a series connection body of both Y capacitors 37 and 38 is provided between the common mode choke coil 34 and the X capacitor 35, and is electrically connected to the common mode choke coil 34. The other end of the first Y capacitor 37 opposite to the one end connects the first winding of the common mode choke coil 34 of the first connection line EL1, specifically the first connection line EL1, to the inverter circuit 31. It is connected to the part. The other end of the second Y capacitor 38 opposite to the one end connects the second winding of the common mode choke coil 34 of the second connection line EL2, specifically the second connection line EL2, to the inverter circuit 31. It is connected to the part.

For example, a PCU (power control unit) 39 is mounted on the vehicle as an in-vehicle device separately from the drive device 24. The PCU 39 uses the DC electric power supplied from the in-vehicle power storage device 28 to drive a traveling motor or the like mounted on the vehicle. That is, in the present embodiment, the PCU 39 and the drive device 24 are connected in parallel to the vehicle-mounted power storage device 28, and the vehicle-mounted power storage device 28 is shared by the PCU 39 and the drive device 24.

The PCU 39 has, for example, a boost converter 40 having a step-up switching element and periodically turning ON / OFF the step-up switching element to boost the DC power of the vehicle-mounted power storage device 28, and the PCU 39 in parallel with the vehicle-mounted power storage device 28. It includes a connected power supply capacitor 41. Although not shown, the PCU 39 includes a traveling inverter that converts the DC power boosted by the boost converter 40 into driving power that can be driven by the traveling motor.

In such a configuration, noise generated due to switching of the step-up switching element flows into the drive device 24 as normal mode noise. In other words, the normal mode noise includes a noise component corresponding to the switching frequency of the step-up switching element.

Next, the configuration of the common mode choke coil 34 will be described with reference to FIG.
The common mode choke coil 34 is for suppressing the high frequency noise generated in the PCU 39 on the vehicle side from being transmitted to the inverter circuit 31 on the compressor side. In particular, the normal mode is achieved by using the leakage inductance as the normal inductance. It is used as the L component in the low-pass filter circuit (LC filter) 36 for removing noise (differential mode noise). That is, it is possible to deal with common mode noise and normal mode noise (differential mode noise), and instead of using both the common mode choke coil and the normal mode (differential mode) choke coil, one choke coil is used. It can handle mode noise.

In the drawings, the three-axis Cartesian coordinates are defined, the axial direction of the rotation axis 17 in FIG. 1 is the Z direction, and the directions orthogonal to the Z direction are the X and Y directions.
As shown in FIGS. 6A, 6B, and 6C, the common mode choke coil 34 includes a case 50, a core 60, a first winding 70, and a second winding 71. The winding 70 and the winding 71 are wound around the case 50 containing the core 60.

The core 60 is housed inside the case 50. The core 60 has a rectangular cross section as shown in FIG. 6 (c), and has a substantially rectangular annular shape as a whole in the XY plane shown in FIG. 6 (a).

The case 50 has an annular shape, is made of resin, and has electrical insulation. The case 50 includes a main body 51 and a wall 52. The main body 51 covers the core 60. Windings 70 and 71 are wound around the main body 51.

The wall 52 is provided on the inner peripheral surface side of the core 60 so as to extend in the Z direction between the winding 70 and the winding 71. The wall 52 separates the winding 70 from the winding 71.
The first winding 70 is wound around the outer surface of the case 50. The second winding 71 is wound around the outer surface of the case 50. Specifically, the case 50 includes a first straight line portion 55 and a second straight line portion 56, and the first straight line portion 55 and the second straight line portion 56 extend in a straight line so as to be parallel to each other. The first winding 70 is wound around the first straight portion 55. The second winding 71 is wound around the second straight portion 56. The winding directions of both windings 70 and 71 are opposite to each other. Further, the first winding 70 and the second winding 71 face each other while being separated from each other.

As shown in FIGS. 6 (a), 6 (b), and 6 (c), in the common mode choke coil 34, the first winding portion 90 in which the first winding 70 is wound without a gap, and the first winding portion 90, and The second winding 71 has a second winding portion 91 wound without a gap. Lead wires 71a and 71b extend toward the circuit board 29 from both ends (winding start or winding end) of the second winding portion 91. The lead wire 70a extends from one end (winding start or winding end) of the first winding portion 90, and the lead wire 70b extends axially from the inner peripheral side from the other end (winding end or winding start) of the first winding portion 90. It is routed back and extends from the axial center. In this way, the lead wire 70b extends toward the circuit board 29 from the position sandwiched between the first winding portion 90 and the second winding portion 91.

As shown in FIG. 3, a screw 81 as a fastening member and a plurality of other screws 82 are provided. Each screw 81, 82 has conductivity. The screws 81 and 82 as the fastening members are for fastening the circuit board 29 to the housing 14. Specifically, the circuit board 29 is fastened by screwing the screws 81 and 82 penetrating the circuit board 29 into the bottom wall portion 15a of the suction housing 15. At this time, as shown in FIGS. 5A and 5B, the wiring pattern 80 of the circuit board 29 and the housing 14 grounded to the ground side are electrically connected by the conductive screw 81. It is fastened in the state of being.

As shown in FIG. 3, the common mode choke coil 34 is mounted on one surface 29a (see FIG. 1) of the circuit board 29. As shown in FIGS. 3 and 4, the common mode choke coil 34 is arranged along the side wall 83 of the accommodation chamber S0 and adjacent to the screw 81. Note that FIG. 3 is a diagram showing an inverter device with the cover 25 of FIG. 1 removed, and FIG. 4 is a diagram when only the circuit board 29 is removed from FIG.

As shown in FIG. 3, chip capacitors C1, C2, C3, C4, C5 and C6 as a plurality of Y capacitors are mounted on the other surface 29b (see FIG. 1) of the circuit board 29. The chip capacitors C1, C2, and C3 have a lead wire 70b (point P1 on the electric circuit of FIG. 2) of the common mode choke coil 34 and a screw 81 (on the electric circuit of FIG. 2) on the electric circuit (see FIG. 2). It is located between the point P2) at.

As shown in FIG. 3, the chip capacitors C1, C2, C3 and the chip capacitors C4, C5, C6 are positioned so as to be within the projection plane of the common mode choke coil 34 with respect to the circuit board 29.

Further, as shown in FIG. 4, an inverter circuit 31 is mounted in the central portion of the circuit board 29 in the accommodation chamber S0. The inverter circuit 31 uses an IPM modularized by incorporating switching elements Qu1, Qu2, Qv1, Qv2, Qw1, Qw2 and the like.

Next, the action will be described.
In FIG. 3, an inverter circuit 31 (IPM) is arranged in the central portion of the circuit board 29 so that the parts most likely to generate heat can be cooled preferentially, and parts other than the inverter circuit 31 are arranged around the inverter circuit 31. are doing. In particular, the common mode choke coil 34 and the six chip capacitors C1 to C6 constituting the Y capacitors 37 and 38 are arranged along the side wall 83 of the accommodation chamber S0 and adjacent to the screw 81.

Here, one of the winding start and winding end of the winding 70 of the common mode choke coil 34 is drawn inward of the winding portion and taken out to form a lead wire 70b, whereby chip capacitors C1 to C3 (C4). ~ C6) can be positioned so as to fit within the projection plane of the common mode choke coil 34 with respect to the circuit board 29.

In this way, by devising the position of the lead wire 70b of the common mode choke coil 34, it is possible to secure an area where the chip capacitors C1 to C3 (C4 to C6) can be mounted on the circuit board 29.

7 (a), 7 (b), and 8 are comparative examples.
As shown in FIGS. 7 (a) and 7 (b), in the common mode choke coil 100, the first winding 102 and the second winding 103 are wound around the core 101, and both ends of the first winding 102 are wound. The lead wires 102a and 102b of the above and the lead wires 103a and 103b at both ends of the second winding 103 are provided. As shown in FIG. 8, when the common mode choke coil 100 is mounted on the circuit board 111 in the inverter accommodating chamber 110, the circuit board 111 is attached to the housing 112 with screws Sc, and the wiring pattern of the circuit board 111 and the housing 112 are electrically connected. If the common mode choke coil 100 is arranged along the side wall 110a of the inverter accommodating chamber 110 and adjacent to the screw Sc, the Y capacitor is placed between the screw Sc and the common mode choke coil 100. There is no space left for mounting the Y capacitor, and mounting the Y capacitor elsewhere will lead to an increase in size. That is, if the common mode choke coil 100 is arranged closer to the side wall 110a of the inverter accommodating chamber 110 and the space between the screw Sc and the common mode choke coil 100 is narrow, the space between the screw Sc and the common mode choke coil 100 It is not possible to arrange a plurality of chip capacitors that make up the Y capacitor.

On the other hand, in the present embodiment, as shown in FIGS. 6 (a), 6 (b), and 6 (c), the lead wire 70b of the winding 70 of the common mode choke coil 34 is drawn and taken out. As shown in 3, a plurality of chip capacitors C1 to C3 (C4 to C6) constituting the Y capacitor can be arranged between the screw 81 and the common mode choke coil 34.

According to the above embodiment, the following effects can be obtained.
(1) In the in-vehicle electric compressor 11 as an electric compressor in which the compression unit 18 and the electric motor 19 are housed in the housing 14 and the inverter device 30 is housed in the storage chamber S0 as the inverter storage chamber, the inverter device. Reference numeral 30 denotes a screw 81 as a fastening member which has conductivity and electrically connects the circuit board 29 to the housing 14 and the wiring pattern 80 of the circuit board 29 and the housing 14. A common mode choke coil 34 mounted on one surface 29a of the circuit board 29 and arranged along the side wall 83 of the accommodating chamber S0 and adjacent to the screw 81, and mounted on the other surface 29b of the circuit board 29. The common mode choke coil 34 includes chip capacitors C1, C2, and C3 as a plurality of Y capacitors located between the lead wire 70b of the common mode choke coil 34 and the screw 81 on the electric circuit. The lead wire 70b has a first winding portion 90 in which the wire 70 is wound without a gap and a second winding portion 91 in which the second winding 71 is wound without a gap. The plurality of chip capacitors C1, C2, and C3 extend toward the circuit board 29 from the position sandwiched between the 90 and the second winding portion 91 so as to be within the projection plane of the common mode choke coil 34 with respect to the circuit board 29. positioned.

Therefore, by devising the shape (drawing method) of the lead wire 70b of the common mode choke coil 34 with respect to the circuit board 29, the chip capacitor in the circuit board 29 on which the common mode choke coil 34 and the plurality of chip capacitors C1 to C3 are mounted. The mounting area of C1 to C3 can be secured, the effective mounting area of the circuit board 29 can be increased, and the chip capacitors C1 to C3 can be mounted. That is, the component mounting area on the circuit board 29 can be increased without affecting the performance of the common mode choke coil 34.

The embodiment is not limited to the above, and may be embodied as follows, for example.
○ When the chip capacitors C1 to C3 are located between the lead wire 70b of the common mode choke coil 34 and the screw 81 on the electric circuit, the lead wire 70b is connected to the first winding portion 90 and the second winding portion 91. It was made to extend from the sandwiched position toward the circuit board 29. It is not limited to this.

For example, when the chip capacitors C1 to C3 are located between the lead wire 70a of the common mode choke coil 34 and the screw 81 on the electric circuit, the lead wire 70a is connected to the first winding portion 90 and the second winding portion 91. It may extend from the position sandwiched between the two toward the circuit board 29.

In addition, when the chip capacitors C4 to C6 are located between the lead wire 71a of the common mode choke coil 34 and the screw 81 on the electric circuit, the lead wire 71a is connected to the first winding portion 90 and the second winding portion. It may extend from the position sandwiched between the 91 and the circuit board 29 toward the circuit board 29.

In addition, when the chip capacitors C4 to C6 are located between the lead wire 71b of the common mode choke coil 34 and the screw 81 on the electric circuit, the lead wire 71b is connected to the first winding portion 90 and the second winding portion. It may extend from the position sandwiched between the 91 and the circuit board 29 toward the circuit board 29.

○ In FIG. 2, the Y capacitor 37 was composed of three chip capacitors C1, C2, and C3 connected in series, and the Y capacitor 38 was composed of three chip capacitors C4, C5, and C6 connected in series. Not limited to this, at least one of the Y capacitor 37 and the Y capacitor 38 may be composed of a plurality of capacitors connected in series.

○ The rotating shaft 17, the compression unit 18, and the electric motor 19 are housed in the housing 14, and the cover 25 joined to the housing 14 forms a storage room S0 as an Invar storage room, but the present invention is not limited to this. For example, the housing is composed of a first housing component and a first housing component, and a rotating shaft 17, a compression unit 18, and an electric motor 19 are housed in the first housing component, and an inverse is provided by the second housing component. A housing chamber S0 as a housing chamber may be formed.

○ Not limited to the in-vehicle electric compressor, it may be used in a non-in-vehicle electric compressor.

11 ... In-vehicle electric compressor, 14 ... Housing, 18 ... Compressor, 19 ... Electric motor, 29 ... Circuit board, 29a ... One side, 29b ... The other side, 30 ... Inverter device, 34 ... Common mode choke coil , 70 ... 1st winding, 70a, 70b ... Lead wire, 71 ... 2nd winding, 71a, 71b ... Lead wire, 80 ... Wiring pattern, 81 ... Screw, 83 ... Side wall, 90 ... 1st winding part, 91 ... Volume 2 winding section, C1, C2, C3, C4, C5, C6 ... Chip capacitor, S0 ... Storage chamber.

Claims (1)

In an electric compressor in which a compression unit and an electric motor are housed in a housing and an inverter device is housed in an inverter housing chamber.
The inverter device is
With the circuit board
A fastening member that has conductivity and fastens the circuit board to the housing while electrically connecting the wiring pattern of the circuit board and the housing.
A common mode choke coil mounted on one surface of the circuit board and arranged along the side wall of the inverter accommodating chamber and adjacent to the fastening member.
A plurality of Y capacitors mounted on the other surface of the circuit board and located between the lead wire of the common mode choke coil and the fastening member on the electric circuit.
With
The common mode choke coil has a first winding portion in which the first winding is wound without a gap, and a second winding portion in which the second winding is wound without a gap.
The lead wire extends from a position sandwiched between the first winding portion and the second winding portion toward the circuit board.
An electric compressor characterized in that the plurality of Y capacitors are positioned so as to fit within the projection plane of the common mode choke coil with respect to the circuit board.