JP7342758B2 - Automotive electric compressor - Google Patents

Description

The present invention relates to a vehicle-mounted electric compressor.

As disclosed in Patent Document 1, among the coils used in many models in recent years, in order to improve EMC resistance in automotive electric compressors, the core, which is mainly a magnetic material, is coated with an insulating coating, etc. If they are not insulated, it is necessary to sandwich a core case made of resin or the like between the windings and the core in order to ensure insulation between the windings and the core. Furthermore, the core case is often made up of two parts, and the core is sandwiched between the top and bottom.

JP2019-187228A

By the way, the core is housed in a core case, and there is a gap between the core and the core case, so there is a concern that the core may move between the core and the core case due to vehicle vibration. There is. This impact load also applies stress to the circuit board and to the windings to be soldered, increasing the risk of weakening the soldered parts, which are electrical connections and mechanical joints. Furthermore, the movement of the core increases the risk that the electrical characteristics of the coil will deviate from desired values.

An object of the present invention is to provide an on-vehicle electric compressor that can suppress movement of the core in a choke coil and improve vibration resistance.

An on-vehicle electric compressor for solving the above problems includes a compression part that compresses fluid, an electric motor that drives the compression part, an inverter device that drives the electric motor, and an inverter device that is housed inside. The inverter device includes a housing, a circuit board, and a choke coil mounted on the circuit board, the choke coil having an annular core, electrical insulation, and covering the core. The core case includes an annular core case, a pair of windings wound around the core case, and a holder having electrical insulation properties and fixed to the housing and accommodating the choke coil. , an opening is formed between the pair of windings in the circumferential direction, and the core is fixed to the holder with an adhesive through the opening.

According to this, movement of the core in the choke coil is suppressed by fixing the core to the holder with an adhesive through an opening formed between a pair of windings in the circumferential direction of the core case. Vibration resistance can be improved. Further, it is also possible to stabilize the electrical characteristics of the coil.

Further, in the on-vehicle electric compressor, the core case has a pair of walls that stand upright toward the holder and sandwich the opening in the circumferential direction, and the adhesive is applied to the pair of walls. A gap may be formed between the pair of windings and the holder by disposing the pair of wall portions in a sandwiched region and abutting the holder.

In this case, the amount of adhesive can be reduced while maintaining insulation properties. Furthermore, by providing a void, a winding cooling effect can be obtained.

According to the present invention, it is possible to suppress movement of the core in the choke coil and improve vibration resistance.

1 is a schematic diagram showing an overview of an on-vehicle electric compressor. A circuit diagram of a drive device and an electric motor. (a) is a top view of a circuit board and a common mode choke coil, (b) is a front view of a circuit board and a common mode choke coil, and (c) is a right side view of a circuit board and a common mode choke coil. A cross-sectional view taken along line AA in FIG. 3(a). FIG. 2 is an exploded perspective view of a circuit board and a common mode choke coil. A perspective view of a common mode choke coil. (a) is a plan view of a common mode choke coil, and (b) is a front view of the common mode choke coil. An exploded perspective view of a common mode choke coil. (a) is a plan view of a common mode choke coil, and (b) is a front view of the common mode choke coil. A sectional view taken along the line AA in FIG. 9(a).

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

As shown in FIG. 1, the vehicle-mounted air conditioner 10 includes a vehicle-mounted electric compressor 11 and an external refrigerant circuit 12 that supplies 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 vehicle-mounted air conditioner 10 performs heating and cooling in the vehicle by compressing a refrigerant by the vehicle-mounted electric compressor 11 and performing heat exchange and expansion of the refrigerant by the external refrigerant circuit 12.

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

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

The housing 14 has an inlet housing 15, an outlet housing 16 and a control housing 17 assembled together. The suction housing 15 has a cylindrical shape with a bottom that opens in one direction, and includes a plate-shaped bottom wall portion 15a and a side wall portion 15b that stands up from the peripheral edge of the bottom wall portion 15a toward the discharge housing 16. There is. The bottom wall portion 15a is, for example, approximately plate-shaped, and the side wall portion 15b is, for example, approximately cylindrical. The discharge housing 16 is assembled to the suction housing 15 in a state where the opening of the suction housing 15 is closed. Thereby, an internal space partitioned by the suction housing 15 and the discharge housing 16 is formed.

The suction port 14a is formed in the side wall portion 15b of the suction housing 15. Specifically, the suction port 14a is disposed on the side wall portion 15b of the suction housing 15 closer to the bottom wall portion 15a than the discharge housing 16 is.

The discharge housing 16 is formed with a discharge port 14b through which the refrigerant is discharged. The discharge port 14b is formed in the discharge housing 16, specifically, in a portion of the discharge housing 16 that faces the bottom wall portion 15a.

The on-vehicle electric compressor 11 includes a rotating shaft 18 , a compression section 19 , and an electric motor 20 housed in an internal space partitioned by a suction housing 15 and a discharge housing 16 .
The rotating shaft 18 is rotatably supported. The rotating shaft 18 is disposed such 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 cylindrical side wall portion 15b). The rotating shaft 18 and the compression section 19 are connected.

The compression portion 19 is arranged closer to the discharge port 14b than the suction port 14a (in other words, the bottom wall portion 15a). The compression section 19 compresses the refrigerant sucked in from the suction port 14a by rotating the rotating shaft 18, and discharges the compressed refrigerant from the discharge port 14b. In addition, the specific structure of the compression part 19 is arbitrary, such as a scroll type, a piston type, and a vane type.

The electric motor 20 is arranged between the compression section 19 and the bottom wall section 15a. The electric motor 20 drives the compression section 19 by rotating the rotating shaft 18 . The electric motor 20 includes, for example, a cylindrical rotor 21 fixed to the rotating shaft 18 and a stator 22 fixed to the suction housing 15. The stator 22 includes a cylindrical stator core 23 and a coil 24 wound around teeth formed in the stator core 23. The rotor 21 and the stator 22 are opposed to each other in the radial direction of the rotating shaft 18. When the coil 24 is energized, the rotor 21 and the rotating shaft 18 are rotated, and the refrigerant is compressed by the compression section 19.

As shown in FIG. 1, in the on-vehicle electric compressor 11, a drive device 25 is housed in a storage chamber S0 partitioned by a suction housing 15 and a control housing 17, and the drive device 25 drives an electric motor 20. DC power is input.

The control housing 17 has a cylindrical shape with a bottom and opens toward the bottom wall 15a of the suction housing 15. The control housing 17 is attached to the bottom wall 15a with bolts 26, with the open end abutted against the bottom wall 15a. The opening of the control housing 17 is closed by a bottom wall portion 15a. The storage chamber S0 is formed by the control housing 17 and the bottom wall portion 15a.

The storage chamber S0 is arranged on the opposite side of the electric motor 20 with respect to the bottom wall portion 15a. The compression section 19, the electric motor 20, and the drive device 25 are arranged in the axial direction of the rotating shaft 18.

A connector 27 is provided on the control housing 17 and the drive device 25 is electrically connected to the connector 27 . Direct current power is input to the drive device 25 from an on-vehicle power storage device 28 mounted on the vehicle via the connector 27, and the air conditioning ECU 13 and the drive device 25 are electrically connected. The vehicle-mounted power storage device 28 is a DC power supply mounted on the vehicle, and is, for example, a secondary battery, a capacitor, or the like.

As shown in FIG. 1, a circuit board 29 is arranged in the storage chamber S0. The circuit board 29 has a plate shape. The circuit board 29 is arranged to face the bottom wall portion 15a at a predetermined distance in the axial direction of the rotating shaft 18. The drive device 25 includes an inverter device 30 and two connection lines EL1 and EL2 used to electrically connect the connector 27 and the inverter device 30. The drive device 25 is constructed using a circuit board 29.

The inverter device 30 is for driving the electric motor 20. The inverter device 30 includes an inverter circuit 31 (see FIG. 2), a circuit board 29, and a noise reduction section 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 contained in the DC power before being input to the inverter circuit 31.

Next, the electrical configuration of the electric motor 20 and the drive device 25 will be explained.
As shown in FIG. 2, the coil 24 of the electric motor 20 has a three-phase structure including, for example, a U-phase coil 24u, a V-phase coil 24v, and a W-phase coil 24w. Each of the coils 24u to 24w is, for example, Y-connected.

The inverter circuit 31 includes u-phase switching elements Qu1, Qu2 corresponding to the u-phase coil 24u, v-phase switching elements Qv1, Qv2 corresponding to the v-phase coil 24v, and a w-phase switching element Qw1, corresponding to the w-phase coil 24w. It is equipped with Qw2. Each of the switching elements Qu1 to Qw2 is a power switching element such as an IGBT. Note that the switching elements Qu1 to Qw2 have free wheel diodes (body diodes) Du1 to Dw2.

The u-phase switching elements Qu1 and Qu2 are connected in series to each other via a connection line, and the connection line is connected to the u-phase coil 24u. The series connection body of each U-phase switching element Qu1, Qu2 is electrically connected to both connection lines EL1, EL2, and DC power from the on-vehicle power storage device 28 is input to the series connection body. ing.

Note that the other switching elements Qv1, Qv2, Qw1, and Qw2 are connected in the same manner as the u-phase switching elements Qu1 and Qu2, except that the corresponding coils are different.

The drive device 25 includes a control section 33 that controls the switching operation of each of the switching elements 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 memory such as RAM and ROM, and the memory stores program codes or instructions configured to cause the processor to perform various processes, for example. Memory or computer-readable media includes any available media that can be accessed by a general purpose or special purpose computer.

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

The noise reduction unit 32 includes a circuit board 29 (see FIG. 1), a common mode choke coil 34 mounted on the circuit board 29, and an X capacitor 35 mounted on the circuit board 29. 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 provided between the connector 27 and the inverter circuit 31 in terms of circuit.

Common mode choke coil 34 is provided on both connection lines EL1 and EL2.
The X capacitor 35 is provided at a subsequent stage (on the inverter circuit 31 side) with respect to the common mode choke coil 34, and is electrically connected to both connection lines EL1 and EL2. The common mode choke coil 34 and the X capacitor 35 constitute an LC resonance circuit. That is, the low-pass filter circuit 36 of this embodiment is an LC resonant 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 25 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.

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 connection line EL1, specifically, the first winding of the common mode choke coil 34 of the first connection line EL1 and the inverter circuit 31. connected to the part. The other end of the second Y capacitor 38 opposite to the one end connects the second connection line EL2, specifically, the second winding of the common mode choke coil 34 of the second connection line EL2 and the inverter circuit 31. connected to the part.

The vehicle is equipped with, for example, a PCU (power control unit) 39 as an in-vehicle device separately from the drive device 25. The PCU 39 uses the DC power supplied from the on-vehicle power storage device 28 to drive a driving motor etc. mounted on the vehicle. That is, in this embodiment, the PCU 39 and the drive device 25 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 25.

The PCU 39 includes, for example, a boost converter 40 that has a boost switching element and boosts the DC power of the vehicle-mounted power storage device 28 by periodically turning ON/OFF the boost switching element, and a boost converter 40 that is connected in parallel to the vehicle-mounted power storage device 28 . A power supply capacitor 41 is connected to the power supply capacitor 41. Although not shown, the PCU 39 includes a running inverter that converts the DC power boosted by the boost converter 40 into drive power that can drive the running motor.

Next, regarding the configuration of the common mode choke coil 34, FIGS. 3A, 3B, 3C, 4, 5, 6, 7A, 7B, 8, 9 ( This will be explained using a), (b) and FIG. 10.

In the drawings, three axes orthogonal coordinates are defined, with the axial direction of the rotating shaft 18 in FIG. 1 being the Z direction, and the directions orthogonal to the Z direction being the X and Y directions.
As shown in FIGS. 3A, 3B, 3C, 4 and 5, the common mode choke coil 34 includes an annular core 50, a core case 60, a first winding 70, It includes a second winding 71 and a holder 80. The core case 60 that houses the core 50 is used with the windings 70 and 71 wound around it. The first winding 70 and the second winding 71 constitute a pair of windings that are wound around the core case 60 and soldered to the circuit board 29 at both ends.

As shown in FIGS. 3(a), (b), (c), and 4, the circuit board 29 is secured by a screw 121 that passes through the circuit board 29 and is screwed into a boss 120 provided upright on the bottom wall portion 15a. It is fixed to the bottom wall portion 15a of the suction housing 15.

As shown in FIG. 5, the core 50 is housed inside a core case 60. The core 50 has a rectangular cross section as shown in FIG. 4, and has a substantially rectangular ring shape as a whole in the XY plane shown in FIG. The core 50 has a first straight part 51 and a second straight part 52, and the first straight part 51 and the second straight part 52 extend straight in the X direction so as to be parallel to each other. The core 50 has an arcuate portion 53 that connects the tips of one of the pair of straight portions 51 and 52, and an arcuate portion 54 that connects the tips of the other pair of the straight portions 51 and 52.

As shown in FIGS. 6, 7(a), and 7(b), the core case 60 has an annular shape, is made of resin, and has electrical insulation properties. The core case 60 is of a split type to accommodate the core 50, and consists of an upper case 60a and a lower case 60b, and is divided into two parts in the Z direction. The core case 60 covers most of the outer periphery of the core 50, covering the first linear portion 51 and the second linear portion 52.

The core case 60 includes a main body 61 and flat wall parts 62a, 62b, 62c, 62d, and 62e extending from the main body 61. The main body portion 61 has an approximately rectangular ring shape as a whole in the XY plane. The main body portion 61 includes a first straight portion 63 corresponding to the first straight portion 51 of the core 50, a second straight portion 64 corresponding to the second straight portion 52 of the core 50, and a circular arc portion 53 of the core 50. It has a portion 65 and a portion 66 corresponding to the arc portion 54 of the core 50. The main body portion 61 covers all of the core 50 except for openings 90 and 91 (see FIG. 6), which will be described later.

As shown in FIG. 6 , at least a portion of the first winding 70 is wound around the outer surface of the first linear portion 63 of the main body portion 61 . At least a portion of the second winding 71 is wound around the outer surface of the second linear portion 64 of the main body portion 61 . The winding directions of both windings 70 and 71 are opposite to each other. Further, the first winding 70 and the second winding 71 are opposed to each other while being separated from each other.

The wall portion 62a extends in the X direction passing through the center of the annular main body portion 61 in the XY plane as shown in FIG. 7(a), and extends in the Z direction as shown in FIG. There is. The wall portion 62a is provided so as to extend between the windings 70 and 71 on the inner peripheral surface side of the main body portion 61. The winding 70 and the winding 71 are separated by the wall 62a.

Each of the wall portions 62b, 62c, 62d, and 62e extends radially outward from the center of the annular body portion 61 in the XY plane as shown in FIG. 7(a), and as shown in FIG. It extends in the Z direction. In FIG. 7A, in the circumferential direction of the annular main body portion 61, a wall portion 62c, a wall portion 62d, and a wall portion 62e are located in order counterclockwise with respect to the wall portion 62b. As shown in FIG. 7A, the base of the wall 62b, the base of the wall 62e, and one end of the wall 62a are connected. The base of the wall 62c, the base of the wall 62d, and the other end of the wall 62a are connected.

The wall portions 62c and 62d are provided to extend in the Z direction between the winding wire 70 and the winding wire 71 at a portion 66 corresponding to the circular arc portion 54 of the core 50. Winding wire 70 and winding wire 71 are separated by walls 62c and 62d. The wall portions 62b and 62e are provided between the winding wire 70 and the winding wire 71 at a portion 65 corresponding to the circular arc portion 53 of the core 50 so as to extend in the Z direction. Winding wire 70 and winding wire 71 are separated by walls 62b and 62e.

The first winding 70 is wound between the wall portions 62b and 62c of the main body portion 61 of the core case 60. The second winding 71 is wound between the wall portion 62d and the wall portion 62e of the main body portion 61 of the core case 60. That is, in the main body 61 of the core case 60, the windings 70 and 71 are not wound between the wall 62c and the wall 62d and between the wall 62e and the wall 62b.

As shown in FIGS. 3(a), (b), (c), and FIG. 4, the first winding 70 is in a state in which both ends 70e protrude from the circuit board 29 through through holes in the circuit board 29. It is soldered to the circuit board 29. The second winding 71 faces the first winding 70 while being separated from the first winding 70, and is soldered to the circuit board 29 with both ends 71e protruding from the circuit board 29 through a through hole in the circuit board 29. It is attached.

Both ends 70e of the winding 70 and both ends 71e of the winding 71 are electrically connected to a conductive pattern formed on the circuit board 29 by soldering.
As shown in FIG. 4, heat radiation grease 130 is disposed on the surface of the windings 70, 71 facing the bottom wall 15a of the suction housing 15. Thereby, the common mode choke coil 34 is thermally coupled to the suction housing 15 and eventually to the housing 14.

As shown in FIGS. 3(a), (b), (c), and FIG. 4, the holder 80 is made of resin and has electrical insulation properties. The holder 80 has a plurality of attachment portions 85, and is fixed to the bottom wall portion 15a of the suction housing 15 by screws 123 that pass through the attachment portions 85 and are screwed into bosses 122 provided upright on the bottom wall portion 15a. The holder 80 is fixed to the housing 14 and accommodates the common mode choke coil 34. Holder 80 is placed between circuit board 29 and core case 60 . Specifically, the circuit board 29 is placed on the XY plane, the core case 60 is placed apart from the circuit board 29 in the Z direction, and the holder 80 is placed between the circuit board 29 and the core case 60 in the Z direction. is placed. The holder 80 has a partition wall part 81 and a square frame part 82. The partition wall portion 81 is arranged between the circuit board 29 and the first winding 70 and between the circuit board 29 and the second winding 71. The partition wall portion 81 is rectangular and has a flat plate shape extending in the XY plane.

The frame portion 82 is bent from the outer peripheral edge of the partition wall portion 81 and extends in the Z direction. A through hole 83 (see FIG. 5) through which the end portions of the windings 70 and 71 pass is formed in the partition wall portion 81.
The holder 80 includes a portion of the core 50 that faces the circuit board 29, a portion of the core case 60 that faces the circuit board 29, a portion of the first winding 70 that faces the circuit board 29, and a portion of the second winding 71 that faces the circuit board 29. It is arranged so as to cover a portion facing the circuit board 29 in the.

As shown in FIGS. 6, 7(a), and 7(b), an opening 90 is formed in a portion 65 of the core 50 corresponding to the arc portion 53. As shown in FIGS. An opening 91 is formed in a portion 66 of the core 50 corresponding to the circular arc portion 54 . Therefore, the core case 60 has openings 90 and 91 formed between the pair of windings 70 and 71 in the circumferential direction. Specifically, the opening 90 is provided in a portion of the main body 61 of the core case 60 between the wall 62e and the wall 62b where the windings 70 and 71 are not wound. The opening 91 is provided in a portion of the main body 61 of the core case 60 between the wall 62c and the wall 62d where the windings 70 and 71 are not wound.

The core 50 has an exposed portion 100 exposed through the opening 90 and an exposed portion 101 exposed through the opening 91 . As shown in FIG. 4, the core 50 is fixed to the holder 80 through openings 90 and 91 with adhesives 110 and 111. In the core 50, the exposed portion 100 of the core and the holder 80 are fixed with an adhesive 110, and the exposed portion 101 of the core and the holder 80 are fixed with an adhesive 111. Further, the holder 80 and the core case 60 are fixed with adhesives 110 and 111.

Further, as shown in FIGS. 4 and 6, a pair of walls 62b and 62e of the core case 60 are erected toward the holder 80 and sandwich the opening 90 in the circumferential direction. A pair of walls 62c and 62d of the core case 60 stand upright toward the holder 80 and sandwich the opening 91 in the circumferential direction. The adhesives 110 and 111 are arranged in areas sandwiched between the pair of walls 62b and 62e and the pair of walls 62c and 62d. When the pair of walls 62b, 62e and the pair of walls 62c, 62d come into contact with the holder 80, a gap Sp1 and a gap Sp2 are formed between the pair of windings 70, 71 and the holder 80. Specifically, the space Sp1 is formed using the partition wall part 81 of the holder 80, the frame part 82, and the pair of wall parts 62b, 62e, and the space Sp1 is formed using the partition wall part 81, the frame part 82, and the pair of wall parts 62c, 62d of the holder 80. A void Sp2 is formed using the above. An adhesive 110 is placed in the gap Sp1, and an adhesive 111 is placed in the gap Sp2.

Further, as shown in FIG. 4, the common mode choke coil 34 and the bottom wall portion 15a are fixed with adhesives 131 and 132.
During manufacturing, do the following:

As shown in FIG. 6, from the state where the core 50 is housed in the core case 60 and the first winding 70 and the second winding 71 are wound, as shown in FIGS. Next, the assembly of the core 50, core case 60, and windings 70, 71 is fixed to the holder 80.

At this time, as shown in FIG. 8, adhesives 110a and 111a before being cured are placed at the end of the inner surface of the holder 80. Then, the assembly of the core 50, core case 60, and windings 70, 71 is inserted into the holder 80, and both ends 70e of the winding 70 and both ends 71e of the winding 71 are passed through the through hole 83 of the holder 80.

In this state, the adhesives 110a and 111a are cured. Thereby, as shown in FIG. 10, the holder 80, the core 50, and the core case 60 are fixed by the adhesives 110 and 111.

Furthermore, as shown in FIG. 4, both ends 70e of the first winding 70 and both ends 71e of the second winding 71 are inserted into the through holes of the circuit board 29 so as to penetrate therethrough. Then, both ends 70e of the first winding 70 and both ends 71e of the second winding 71 protruding from the circuit board 29 are soldered to the circuit board 29 by soldering.

Next, the effect will be explained.
The heat generated by the common mode choke coil 34 is released to the bottom wall 15a because the common mode choke coil 34 is thermally connected to the bottom wall 15a. Therefore, the heat generated in the common mode choke coil 34 is released through the heat radiation grease 130, resulting in excellent heat radiation performance to the heat radiation surface.

In the core case 60, an upper case 60a and a lower case 60b are joined together by a claw or the like, and the core 50 is simply sandwiched between the core cases 60 and there is a gap between the core 50 and the core case 60. Therefore, the core 50 moves between the core 50 and the core case 60 due to vibrations of the vehicle. Then, stress is applied to the soldered portions of the circuit board 29 and the windings 70, 71, increasing the risk of lead breakage.

Further, in order to fix the core 50 to the housing with a holder to suppress displacement, it is necessary to use a large amount of adhesive, which is not good in productivity. In other words, when fixing the core case 60 and the holder 80 with adhesive, a large amount of adhesive is required if the core 50 is to be adhered.

In this embodiment, the core 50 is fixed with an adhesive, and a holder 80 is fixed to the housing by cutting out a part of the core case 60 surrounding the core 50 to expose a part of the core 50. The core 50 is fixed with adhesive, eliminating relative displacement between the holder 80 and the core 50, preventing the core 50 and the core case 60 from shaking, and improving vibration resistance by suppressing core movement of the windings 70 and 71. can be achieved. In other words, the core 50 is configured to be directly fixed with the holder 80, thereby suppressing the generation of impact loads. By exposing the core 50 from the core case 60 at a place where leads etc. do not come and where insulation is not required, and fixing the core 50 to the holder 80 with adhesive, and also fixing the core case 60 in the same way, the impact load can be reduced. The occurrence of can be suppressed.

In this way, vibration resistance can be improved, and the amount of adhesive can be suppressed, leading to cost reduction.
According to the above embodiment, the following effects can be obtained.

(1) The configuration of the on-vehicle electric compressor 11 includes a compression section 19 that compresses fluid, an electric motor 20 that drives the compression section 19, an inverter device 30 that drives the electric motor 20, and an inverter device 30 installed inside. A housing 14 for accommodating the housing 14 is provided. The inverter device 30 includes a circuit board 29 and a common mode choke coil 34 as a choke coil mounted on the circuit board 29. The common mode choke coil 34 includes an annular core 50, an annular core case 60 that has electrical insulation and covers the core 50, a pair of windings 70 and 71 wound around the core case 60, and an electrical insulation. a holder 80 which has a holder 80 and is fixed to the housing 14 and accommodates the common mode choke coil 34. The core case 60 has openings 90 and 91 formed between the pair of windings 70 and 71 in the circumferential direction, and the core 50 is connected to the holder 80 and the adhesive 110 and 111 through the openings 90 and 91. is fixed. Therefore, movement of the core 50 in the common mode choke coil 34 can be suppressed, and vibration resistance can be improved. Further, it is also possible to stabilize the electrical characteristics of the coil.

(2) The core case 60 has a pair of walls 62b, 62e and a pair of walls 62c, 62d that stand upright toward the holder 80 and sandwich the openings 90, 91 in the circumferential direction, and includes an adhesive 110, 111 is arranged in a region sandwiched between the pair of walls 62b, 62e and the pair of walls 62c, 62d, and when the pair of walls 62b, 62e and the pair of walls 62c, 62d come into contact with the holder 80, , gaps Sp1 and Sp2 are formed between the pair of windings 70 and 71 and the holder 80. In this case, the amount of adhesive can be reduced while maintaining insulation properties. Furthermore, by providing the gaps Sp1 and Sp2, a cooling effect for the windings 70 and 71 can be obtained.

The embodiment is not limited to the above, and may be embodied as follows, for example.
○The adhesive may be cured by time or by heating, and in short, the adhesive function may be imparted by curing.

DESCRIPTION OF SYMBOLS 11... Vehicle electric compressor, 14... Housing, 19... Compression part, 20... Electric motor, 29... Circuit board, 30... Inverter device, 34... Common mode choke coil, 50... Core, 60... Core case, 62b, 62e...Pair of wall parts, 62c, 62d...Pair of wall parts, 70, 71...Pair of windings, 70e...Both ends, 71e...Both ends, 80...Holder, 90, 91...Opening portion, 100, 101...Exposed portion , 110, 111...adhesive, Sp1, Sp2... void.

Claims (3)

a compression section that compresses fluid;
an electric motor that drives the compression section;
an inverter device that drives the electric motor;
a housing that houses the inverter device therein;
The inverter device includes:
a circuit board;
A choke coil mounted on the circuit board,
The choke coil is
a circular core;
an annular core case having electrical insulation properties and covering the core;
a pair of windings wound around the core case;
a holder having electrical insulation properties, fixed to the housing and accommodating the choke coil;
The core case has an opening formed between the pair of windings in the circumferential direction, and the core is fixed to the holder with an adhesive through the opening,
The winding directions of the pair of windings are opposite to each other,
The pair of windings includes a first winding and a second winding,
An on-vehicle electric compressor, wherein both ends of the first winding and both ends of the second winding pass through a through hole of the circuit board and are soldered to the circuit board. The on-vehicle electric compressor according to claim 1, wherein the core is fixed to the housing via the opening with an adhesive. a compression section that compresses fluid;
an electric motor that drives the compression section;
an inverter device that drives the electric motor;
a housing that houses the inverter device therein;
The inverter device includes:
a circuit board;
A choke coil mounted on the circuit board,
The choke coil is
a circular core;
an annular core case having electrical insulation properties and covering the core;
a pair of windings wound around the core case;
a holder having electrical insulation properties, fixed to the housing and accommodating the choke coil;
The core case has an opening formed between the pair of windings in the circumferential direction, and the core is fixed to the holder with an adhesive through the opening,
The core case has a pair of walls that stand upright toward the holder and sandwich the opening in the circumferential direction,
The adhesive is placed only in a region sandwiched between the pair of walls,
The vehicle- mounted electric compressor is characterized in that a gap is formed between the pair of windings and the holder by the pair of wall portions coming into contact with the holder.