WO2023054485A1

WO2023054485A1 - Electric compressor

Info

Publication number: WO2023054485A1
Application number: PCT/JP2022/036205
Authority: WO
Inventors: 慎介宮前; イメドギタリ; モハメドカンチョール; ショーン・マイケルカフマイヤ; ロスティスラフハダス
Original assignee: 株式会社ヴァレオジャパン
Priority date: 2021-09-29
Filing date: 2022-09-28
Publication date: 2023-04-06
Also published as: JPWO2023054485A1

Abstract

[Problem] To suppress production costs of an electric compressor while ensuring the quality of a housing. [Solution] This electric compressor (10) has a compression mechanism (50) provided on an opening (22) side in an interior of a housing (20) having a bottomed cylinder shape, a motor (100) stored in the interior of the housing (20), and an inverter (160) provided on an outer wall surface (21a) of a bottom wall (21) of the housing (20). An annular stator (103) of the motor (100) has a plurality of conducting wires having a plurality of windings (121) wound around a plurality of teeth (111c). First and second lead wires (123, 124), drawn from the plurality of conducting wires (120), are drawn from the inverter (160) side of the stator (103). A plurality of crossover wires (122) that connect the plurality of windings (121) of the plurality of conducting wires (120) to one another are positioned on the compression mechanism (50) side of the stator (103).

Description

electric compressor

The present invention relates to technology for improving the motor of an electric compressor.

The technologies of Patent Document 1 and Patent Document 2 are known as stators for three-phase AC motors used in electric equipment.

According to the three-phase AC motors known in

Patent Documents

1 and 2, the stator includes an annular stator core formed with a plurality of teeth and insulators provided at both ends of the stator core. The insulator has a hook on one end side in the axial direction and on the outer side in the radial direction for hooking the winding end of each coil (winding). The coil is intensively wound around one tooth via insulators provided at both ends of the stator core. The winding end of this coil is hooked on a hook, passed to the next tooth, and concentratedly wound. The winding end of the previous coil becomes a connecting wire that continues to the winding start end of the next coil. In this way, the crossover wires connecting the coils wound around the teeth are arranged radially outside the stator. The beginning and end of the three-phase coil are wired, pulled out, and terminated so that they can be connected to an inverter device that supplies three-phase power. Both the connecting wire and the lead wire (terminal) of the coil are provided on one end side of the stator core.

An electric compressor equipped with such a three-phase motor is disclosed in Patent Document 3. In this electric compressor, an inverter housing covers an open end of a housing (motor housing) made of an aluminum alloy and having a bottomed tubular shape. A lead wire drawn out from one end of the stator core can be engaged with a hermetic pin of the inverter housing through the cluster block. The open end side of the housing has a large inner diameter, and even if a connecting wire (not shown) is arranged near the outer diameter of the coil end as in Patent Document 1 and Patent Document 2, the insulation distance can be maintained. It is designed to be

By the way, in some electric compressors equipped with a three-phase motor, as disclosed in Patent Document 4, the compression mechanism side of a housing made of an aluminum alloy cylindrical member with a bottom is an open end, and the inverter device side is an open end. There is also a so-called inverter-side closed type electric compressor in which the (inverter circuit side) is a closed end.

JP 2017-118671 A WO2020/196071 Japanese Patent No. 5594836 Japanese Patent Application Laid-Open No. 2020-070732

In the inverter-side closed type electric compressor known in Patent Document 4, coil lead wires (terminals) and Both crossover lines will be arranged. Since the lead wire of the coil is located on the inverter device side, the coil crossover wire is inevitably located on the inverter device side. A crossover wire that connects the coils is positioned radially outside the stator, that is, close to the inner peripheral surface of the housing. In order to properly secure electrical insulation between the crossover wire and the inner peripheral surface, it is necessary to secure a sufficient distance (insulation distance) between the crossover wire and the inner peripheral surface.

On the other hand, it is conceivable to radially expand only the portion of the inner peripheral surface of the housing where the connecting wire is located. Generally, however, the housing is constructed by casting. It is difficult to increase the inner diameter of the material surface on the back side of the bottomed cylindrical shape by casting, so the inner diameter of the part facing the coil crossover on the bottom wall side (back side) inside the housing is increased by cutting. must be removed. This increases the production cost of the electric compressor.

Moreover, when casting the housing, it is necessary to increase the thickness of the parts to be cut by the amount to be cut. An increase in wall thickness is disadvantageous in ensuring the quality of the housing.

The present invention has been made to solve the above-described problems, and is an electric compressor in which a motor is provided on the inner bottom wall side of a cylindrical housing with a bottom, while ensuring the quality of the housing. An object of the present invention is to provide a technology capable of suppressing the production cost of an electric compressor.

In the following description, the reference numerals in the attached drawings are added in parentheses to facilitate understanding of the present invention, but the present invention is not limited to the illustrated embodiments.

According to the present invention, a compression mechanism (50) for compressing gas, a motor (100) for driving the compression mechanism (50), an inverter device (160) for supplying drive power to the motor (100), and a housing (20), which is a cylindrical member with a bottom and houses the motor (100) therein, and at least part of the compression mechanism (50) is in the housing (20) An electric compressor (10; 200) provided on the side of an internal opening (22), wherein the inverter device (160) is provided on the outer wall surface (21a) of the bottom wall (21) of the housing (20). , the motor (100) includes a rotor (102) whose center of rotation is the longitudinal direction of the housing (20), and an inner peripheral surface of the housing (20) arranged radially outside the rotor (102). An annular stator (103) fixed to (20a) is provided, and the stator (103) is a stator core ( 111) and a plurality of conducting wires (120) wound around the plurality of teeth (111c), wherein the plurality of conducting wires (120) are individually wound around the plurality of teeth (111c) by concentrated winding. A plurality of wound windings (121), a plurality of crossover wires (122) connecting the plurality of windings (121), and a first lead wire ( 123) and a second lead wire (124) drawn out from the winding end of the conductor (120), the first and second lead wires (123, 124) of the stator (103), the inverter At least one of the first and second lead wires (123, 124) drawn out from the first end (103a) located on the device (160) side is connected to the inverter device (160), A plurality of crossover wires (122) are all arranged at a second end (103b) of the stator (103) located on the side of the compression mechanism (50). provided.

In this way, the bottomed cylindrical housing has a motor on the inner bottom wall side, a compression mechanism on the inner opening side, and an inverter device on the opposite side of the bottom wall to the motor. The stator of the motor has a first end on the bottom wall side of the housing (inverter device side) and a second end on the opening side of the housing (compression mechanism side). All lead wires of the stator are led out from the first end of the stator and can be connected to the inverter device through the bottom wall of the housing.

In addition, all the connecting wires of the stator are arranged at the second end of the stator, and as a result, are positioned on the opening side of the inner peripheral surface of the housing. For example, when the housing is formed by casting, the inner peripheral surface on the opening side can be expanded in the radial direction in advance in the preparation stage of the casting mold. Therefore, it is not necessary to partially cut the inner peripheral surface in a post-process in order to secure the interval (insulation distance) between the crossover wire and the inner peripheral surface. Since cutting is not required, there is no need to consider the thickness of the cut portion. Moreover, even if cutting is performed, it is possible to suppress the machining margin to a necessary minimum. Therefore, the production cost of the electric compressor can be suppressed.

Preferably, the plurality of conducting wires (120) form a plurality of winding groups (131 to 133) for three-phase alternating current, and in each of the plurality of winding groups (131 to 133), the plurality of windings The line (121) is connected in series via the plurality of connecting wires (122), and in each of the plurality of winding groups (131-133), at least Since one number of turns (Na) is different from the other number of turns (Nb), all of the plurality of connecting wires (122) are connected to the first and second lead wires (123) with respect to the stator (103). , 124).

Thus, the number of turns of at least one winding is different from the number of turns of the other windings. Therefore, all of the plurality of connecting wires can be easily positioned on the side opposite to the first and second lead wires with respect to the stator.

Preferably, in each of the plurality of winding groups (131 to 133), the number of turns (Na) of the first winding (121a) is half the number of turns (Nb) of the other windings (121b). By being set to be small, the number of turns (Na) of one of the plurality of windings (121) is different from the number of turns (Nb) of the other windings (121).

For this reason, all of the plurality of connecting wires can be connected to the first and second lead-outs of the stator by a simple configuration in which the number of turns of the first winding is set to be half less than the number of turns of the other windings. It can easily be positioned on the opposite side of the line.

Preferably, the plurality of crossover wires (122) are return crossover wires (122a) returning from the other windings (121b) to the teeth (111c) around which the first winding (121a) is wound. including. The return connecting wire (122a) is connected to an additional winding (121d) passing along only half the circumference of the teeth (111c) around which the first winding (121a) is wound. The additional winding (121d) extends from the return crossover wire (122a) to the second lead wire (124) with respect to the teeth (111c) around which the first winding (121a) is wound, and It extends in the same direction as the winding direction (A2) of the first winding (121a).

Therefore, the additional winding extends along only half the circumference of the teeth around which the first winding is wound, from the return connecting wire to the second lead wire, and in the same direction as the winding direction of the first winding. ing. That is, the additional winding generally adds half a turn to the initial winding. Fewer turns in the first winding can be compensated for by additional windings. As a result, the flux of the first winding can be supplemented to be similar to that of the other windings.

In this way, the plurality of first and second lead wires and the plurality of crossover wires are arranged on opposite sides of the stator, and the magnetic flux of the first winding is distributed in the same manner as the magnetic flux of the other windings. can be compensated to be

Preferably, the end portion (121de) of the additional winding (121d) is fixed to the first end (103a) of the stator (103).

By fixing the terminating end portion of the additional winding to the first end in this manner, the additional winding can be maintained in a state in which it is reliably applied to the teeth without slack or slack. This ensures that the low number of turns of the first winding can be compensated for by additional windings.

Preferably, the first windings (121a) of the plurality of winding groups (131 to 133) are arranged side by side in order in the circumferential direction (A1) of the stator (103). The first and second lead wires (123, 124) of the plurality of winding groups (131 to 133) are arranged side by side in order in the circumferential direction (A1) of the stator (103). .

Thus, all the first windings are aligned side by side in the circumferential direction of the stator. Moreover, all the first and second lead lines are also aligned side by side in the circumferential direction of the stator. That is, all the first windings and all the first and second lead wires are centrally located around each first winding, so that they are compactly integrated into the stator and the inverter Wiring to the device is easy.

Preferably, all the first and second lead wires (123, 124) of the plurality of winding groups (131-133) are delta-connected.

In this way, by delta connecting all the first and second lead wires concentratedly arranged around each first winding, all the first and second lead wires connected to the inverter device can be shortened as much as possible. Since the first and second lead wires are shortened, the copper loss of each winding group can be improved and the weight of the motor can be reduced.

Preferably, all the first and second lead wires (123, 124) of the plurality of winding groups (131-133) are star-connected.

Therefore, each first lead wire can be individually connected to the inverter device, and each second lead wire can be connected as one with the neutral point of the star connection. Each first lead line and the neutral point can be gathered at one location on the stator. In other words, the cluster block (terminal housing) and the neutral point, which bulge around the stator, can be gathered in one place on the stator, so that the motor itself can be made compact.

Preferably, all the second lead wires (124) are integrated with each other by soldering or welding without being fixed to the stator (103).

Therefore, all the second lead wires can be easily integrated by soldering or welding as the neutral point of the star connection.

According to the present invention, in an electric compressor in which a motor is provided on the inner bottom wall side of a bottomed cylindrical housing, it is possible to reduce the production cost of the electric compressor while ensuring the quality of the housing.

1 is a cross-sectional view of an electric compressor according to Example 1. FIG. 2 is an exploded sectional view of the housing and stator shown in FIG. 1; FIG. Figure 3 is a perspective view of the stator shown in Figure 2; FIG. 4 is a diagram schematically showing the arrangement of a plurality of conducting wires with respect to the stator core when the stator shown in FIG. 3 is developed to the outer peripheral side; FIG. 5 is a diagram schematically showing the arrangement of a plurality of conducting wires for the stator core shown in FIG. 4 divided into winding groups of U-phase, V-phase, and W-phase; 6 is a diagram schematically showing the relationship between the first winding and other windings in the U-phase winding group shown in FIG. 5; FIG. 7 is a perspective view of a configuration in which the end portions of the additional windings shown in FIG. 6 are fixed to the stator; FIG. FIG. 10 is a diagram schematically showing the arrangement of a plurality of conducting wires with respect to the stator core when the stator of the electric compressor according to Example 2 is deployed to the outer peripheral side; FIG. 9 is a diagram illustrating a structure for fixing second lead lines shown in FIG. 8 ;

An embodiment of the present invention will be described below based on the accompanying drawings. In addition, the form shown in the accompanying drawings is an example of the present invention, and the present invention is not limited to the form.

<Example 1>
An electric compressor 10 of a first embodiment will be described with reference to FIGS. 1 to 7. FIG.

As shown in FIG. 1, the electric compressor 10 is suitable for use in a refrigeration cycle using a refrigerant as a working fluid, and is used, for example, in a refrigeration cycle of an automotive air conditioner. The application of the electric compressor 10 is not limited.

The electric compressor 10 includes, for example, a housing 20 that can be installed horizontally, a compression mechanism 50 that compresses gas (eg, gaseous refrigerant), a motor 100 that drives the compression mechanism 50, and a driving power for the motor 100. and an inverter device 160 that supplies the

As shown in FIGS. 1 and 2, the housing 20 is a cylindrical member with a bottom, one end of which is closed by a bottom wall 21 and the other end of which is entirely open. That is, the other end of the housing 20 has an opening 22 . This opening 22 is closed by an openable and closable head member 31 . The housing 20 is made of a cast metal material such as aluminum (including aluminum alloy).

The outer wall surface 21a of the bottom wall 21 of the housing 20 is a flat surface. A tubular inverter housing 32 having a bottom is superimposed on and assembled with the outer wall surface 21a. The bottom wall 32 a of the inverter housing 32 overlaps the outer wall surface 21 a of the bottom wall 21 of the housing 20 . An opening 32b of the inverter housing 32 is closed by a lid 33 that can be opened and closed. An inverter device 160 is accommodated in the inverter housing 32 . Details of the inverter device 160 will be described later.

The housing 20 has a first storage chamber 23 on the bottom wall 21 side (arrow R1 side) and a second storage chamber 24 on the opening 22 side (arrow R2 side). These first and

second storage chambers

23 and 24 are continuous in the longitudinal direction (axial direction) of the housing 20 . The first inner peripheral surface 23a of the first storage chamber 23 and the second inner peripheral surface 24a of the second storage chamber 24 are perfect circles with the longitudinal centerline CL1 of the housing 20 as a reference. The diameter D2 of the second inner peripheral surface 24a is larger than the diameter D1 of the first inner peripheral surface 23a.

At least part (for example, the whole) of the compression mechanism 50 is housed in the opening 22 side inside the housing 20, that is, in the second housing chamber 24. A motor 100 is stored inside the housing 20 on the side of the bottom wall 21 , that is, in the first storage chamber 23 . That is, the housing 20 functions as a motor housing and a compressor housing. Hereinafter, the housing 20 may be referred to as "motor housing 20" and/or "compressor housing 20".

Further, the housing 20 has a suction port 25 for sucking refrigerant from the outside into the first storage chamber 23 . The head member 31 includes an oil separation chamber 31a for separating oil from the refrigerant compressed by the compression mechanism 50, and a discharge port (not shown) for discharging the gaseous refrigerant from which the oil is separated by the oil separation chamber 31a. ) and

The first storage chamber 23 and the second storage chamber 24 are partitioned by a disk-shaped partition member 34 (drive shaft support member 34). Both the relative rotation and axial movement of the partition member 34 relative to the housing 20 are restricted. Hereinafter, the first storage chamber 23 may be referred to as the "low pressure chamber 23". The partition member 34 has a plurality of suction holes 34a that allow the first storage chamber 23 and the second storage chamber 24 to communicate with each other. It should be noted that this partition member 34 can be considered as an element that constitutes the compression mechanism 50 . In other words, considering the partition wall 34 as part of the compression mechanism 50 does not depart from the gist of the present invention.

As shown in FIG. 1, the first storage chamber 23 is provided with a drive shaft 41 positioned on the longitudinal centerline CL1 of the housing 20. As shown in FIG. The drive shaft 41 includes both a configuration that serves as the output shaft 101 (motor shaft 101) of the motor 100 and a configuration that is a separate member (not shown) from the output shaft 101 of the motor 100. FIG. Here, a configuration that also serves as the output shaft 101 of the motor 100 will be described. The longitudinal centerline CL1 of the housing 20 may be referred to as "the centerline CL1 of the drive shaft 41 (output shaft 101)".

The drive shaft 41 passes through the partition member 34 toward the compression mechanism 50 , and is driven by a first bearing 42 provided in the partition member 34 and a second bearing 43 provided in the bottom wall 21 of the housing 20 . rotatably supported. Further, the drive shaft 41 has an eccentric shaft 44 on one end face penetrating the partition member 34 . The eccentric shaft 44 extends from one end surface of the drive shaft 41 toward the compression mechanism 50 and is parallel to the drive shaft 41 . The centerline CL2 of the eccentric shaft 44 is offset from the centerline CL1 of the drive shaft 41 . An annular bush 45 is rotatably fitted to the eccentric shaft 44 . A part of the bush 45 is integrally provided with a counterweight 46 projecting radially from the bush 45 . The inner peripheral surface of the third bearing 47 is fitted to the outer peripheral surface of the bush 45 .

As shown in FIG. 1 , the compression mechanism 50 includes, for example, a fixed scroll 60 supported between the head member 31 and the partition member 34 so as not to rotate relative to each other, and a scroll member that swings circumferentially with respect to the fixed scroll 60 . A possible orbiting scroll 70 is combined to form a so-called scroll compression mechanism that compresses gas (for example, gaseous refrigerant).

The fixed scroll 60 has a disc-shaped fixed end plate 61 , a cylindrical outer peripheral wall 62 , and a spiral-shaped fixed spiral wall 63 . The fixed end plate 61 is orthogonal to the center line CL2 of the eccentric shaft 44. As shown in FIG. The outer peripheral wall 62 is a cylinder extending from the outer peripheral edge of the stationary end plate 61 toward the motor 100 side. The outer peripheral wall 62 is formed with a refrigerant suction port 64 for sucking refrigerant from radially outward to radially inward. The fixed spiral wall 63 is located inside the outer peripheral wall 62 and stands up from the bottom surface of the fixed end plate 61 .

The orbiting scroll 70 can revolve with respect to the fixed scroll 60 . The oscillating scroll 70 has a disk-shaped oscillating end plate 71 positioned opposite the fixed spiral wall 63 and a spiral oscillating spiral wall 72 .

The orbiting end plate 71 is perpendicular to the center line CL3 of the orbiting scroll 70, is positioned inside the outer peripheral wall 62 of the fixed scroll 60, and is rotatably supported by the eccentric shaft 44. The oscillating spiral wall 72 is erected from the oscillating end plate 71 toward the fixed spiral wall 63 , and is combined with the fixed spiral wall 63 to form a plurality of compression chambers 73 . By rotating the drive shaft 41 , the orbiting scroll 70 can revolve (rotate eccentrically) around the axis CL<b>2 of the eccentric shaft 44 .

Further, the compression mechanism 50 has an anti-rotation mechanism 80 that prevents the orbiting scroll 70 from rotating. The anti-rotation mechanism 80 includes a plurality of recesses 81 provided in the oscillating end plate 71, a plurality of ring members 82 fitted in the plurality of recesses 81, and the plurality of ring members 82 extending from the partition member 34. It is a pin-and-ring type anti-rotation mechanism comprising a plurality of anti-rotation pins 83 extending inward. The line contact between the plurality of ring members 82 and the plurality of anti-rotation pins 83 prevents rotation of the orbiting scroll 70 and permits the orbiting of the orbiting scroll 70 .

The rotation of the drive shaft 41 causes the orbiting scroll 70 to revolve. As a result, the refrigerant sucked from the suction port 25 passes through the clearance of the motor 100 in the low pressure chamber 23, passes through the suction hole 34a of the partition member 34, passes through the refrigerant suction port 64 of the fixed scroll 60, and flows into the compression chamber. Enter 73. As the orbiting scroll 70 revolves, the compression chamber 73 moves toward the center while gradually decreasing its internal volume. Thereby, the refrigerant in the compression chamber 73 is compressed. As the pressure in the compression chamber 73 increases, the check valve 91 opens, and the compressed refrigerant flows into the discharge chamber 92 in the head member 31 and flows through the oil separation chamber 31a to the discharge port (not shown). ) to the outside.

As shown in FIG. 1, the motor 100 has, for example, a configuration of a three-phase AC brushless motor. The motor 100 includes the output shaft 101 (drive shaft 41), a rotor 102 fixed to the output shaft 101, and an annular stator 103 surrounding the rotor 102. stored.

The rotor 102 has its center of rotation in the longitudinal direction of the housing 20 (it is rotatable with respect to the center line CL1 of the output shaft 101). The stator 103 is arranged radially outside the rotor 102 and fixed to the inner peripheral surface 20a of the housing 20 (the first inner peripheral surface 23a of the first storage chamber 23). For example, the stator 103 is fixed to the inner peripheral surface 20a of the housing 20 by being fitted to the first inner peripheral surface 23a by "tight fit". As a method of interference fitting, for example, shrink fitting, press fitting, and the like can be mentioned.

As shown in FIGS. 1 and 3, this stator 103 has an annular stator core 111 and a plurality of conducting wires 120. As shown in FIG. Both

end surfaces

111a and 111b of the stator core 111 are provided with first and second insulators 112 and 113 (insulators 112 and 113). It is also possible to configure the stator core assembly 110 by previously attaching the first and

second insulators

112 and 113 to both end faces 111 a and 111 b of the stator core 111 . Hereinafter, the centerline CL1 of the output shaft 101 may be referred to as "the centerline CL1 of the stator core 111".

The stator core 111 is constructed with a laminated structure of ferromagnetic plates such as magnetic steel plates. A plurality of teeth 111c are formed on the radial inner surface of stator core 111 and protrude toward center line CL1 of stator core 111 . These teeth 111c are arranged at equal pitches in the circumferential direction of the stator 103 (direction of arrow A1). The number of multiple teeth 111c is a multiple of 3, for example, 18 pieces.

The first insulator 112 is an annular member provided on the end surface 111a of the stator core 111 on the inverter device 160 side (arrow R1 side), and is made of an electrically insulating resin molded product. The first insulator 112 forms a first end portion 103a of the stator 103 located on the inverter device 160 side. When stator core 111 is viewed along center line CL1, first insulator 112 has the same shape as stator core 111 (including a plurality of teeth 111c).

The second insulator 113 has the same configuration as the first insulator 112, and is an annular member provided on the end surface 111b of the stator core 111 on the compression mechanism 50 side (arrow R2 side), and is an electrically insulating resin. is composed of molded products. The second insulator 113 forms a second end 103b of the stator 103 located on the compression mechanism 50 side. When stator core 111 is viewed along center line CL1, second insulator 113 has the same shape as stator core 111 (including a plurality of teeth 111c).

See Figures 3 and 4. FIG. 4 is a view of the inner peripheral surface of stator 103 shown in FIG. In order to facilitate understanding of the description, the teeth 111c shown in FIG. 4 are numbered sequentially from "1" to "18" for convenience. The first tooth 111c is labeled with "1".

A plurality of conducting wires 120 are wound around a plurality of teeth 111c, and constitute U-phase, V-phase, and W-phase winding groups 131 to 133 for three-phase alternating current. That is, the number of conductors 120 is three. In each of the plurality of winding groups 131 to 133, the plurality of conducting wires 120 include a plurality of windings 121 individually wound around a plurality of teeth 111c by concentrated winding, and a plurality of windings connecting the plurality of windings 121 to each other. and a crossover 122 of . Further, each conducting wire 120 includes a first lead wire 123 drawn from the winding start of the conducting wire 120 and a second lead wire 124 drawn from the winding end of the conducting wire 120 .

The plurality of crossover wires 122 are all arranged at the second end portion 103b of the stator 103. The first and second

lead wires

123 and 124 are drawn out from the first end portion 103a of the stator 103. As shown in FIG. At least one of the first and second

lead wires

123 and 124, for example the first lead wire 123, is connected to an inverter device 160 (see FIG. 1). A connection structure of the first and

second lead lines

123 and 124 will be described later.

See Figures 4 and 5. FIG. 5 schematically shows the arrangement of a plurality of conducting wires 120 for stator core 111 shown in FIG. 4, divided into U-phase, V-phase, and W-phase winding groups 131-133.

Here, in each of the plurality of winding groups 131 to 133, among the plurality of windings 121, the winding 121a wound first from the first lead wire 123 at the winding start of the conductor 120 is referred to as the "first winding." 121a", and the remaining winding 121b is referred to as the "other winding 121b".

The respective first windings 121a are arranged side by side in order in the circumferential direction of the stator 103 (arrow A1 direction). For example, the first winding 121a of the U-phase winding group 131 is wound around the first tooth 111c. The first winding 121a of the V-phase winding group 132 is wound around the second tooth 111c. The first winding 121a of the W-phase winding group 133 is wound around the third tooth 111c. For each of the winding groups 131-133, the respective other windings 121b are arranged in order from the first winding 121a in the circumferential direction of the stator 103 every two. For example, the windings 121 of the U-phase winding group 131 are wound around the first, fourth, seventh, tenth, thirteenth, and sixteenth teeth 111c.

In the U-phase winding group 131, the winding 121c wound around the 16th tooth 111c is called the "last winding 121c". In the V-phase winding group 132, the winding 121 wound around the 17th tooth 111c is called the "last winding 121c". In the W-phase winding group 133, the winding 121 wound around the 18th tooth 111c is called the "last winding 121c".

See Figures 5 and 6. FIG. 6 schematically shows the relationship between the first winding 121a and the other winding 121b in the U-phase winding group 131 shown in FIG.

In each of the U-phase, V-phase, and W-phase winding groups 131 to 133, the number of turns Nb of the other winding 121b is an integer larger than 0 (eg, 30 turns). A winding start portion 121bs and a winding end portion 121be of another winding 121b are located at the second end portion 103b of the stator 103 .

On the other hand, in each of the U-phase, V-phase, and W-phase winding groups 131 to 133, the winding start portion 121as of the first winding 121a is located at the first end portion 103a of the stator 103, and is located at the first lead wire. 123 continues. The number of turns Na of each first winding 121a is set to be half less than the number of turns Nb of the other windings 121b. That is, in each of the plurality of winding groups 131 to 133, the number of turns Na of one of the plurality of windings 121 is different from the number of turns Nb of the other winding 121b. Since the number of turns Na of the first winding 121a is less by half, the winding end portion 121ae of the first winding 121a is located on the opposite side to the winding start portion 121as of the first winding 121a, that is, the second winding of the stator 103. Located at the end 103b.

In the U-phase winding group 131, the winding end portion 121ae of the first winding 121a wound on the first tooth 111c and the winding of the next other winding 121b wound on the fourth tooth 111c. The start portion 121bs is connected by a crossover wire 122 . The winding end portion 121be of the other winding 121b wound around the fourth tooth 111c and the winding start portion of the next other winding 121b wound around the seventh tooth 111c are separated by the crossover wire 122. It is connected. Similarly, the following other windings 121b wound around the seventh, tenth, thirteenth, and sixteenth teeth 111c are also connected in series by a crossover wire 122. FIG. The V-phase and W-phase winding groups 131 have the same configuration. As is clear from the above description, in each of the U-phase, V-phase, and W-phase winding groups 131 to 133, the winding end portion 121ae of the first winding 121a and the winding start portion of each of the other windings 121b 121bs and the winding end portion 121be of each other winding 121b are connected in series by a crossover wire 122 . Thus, in each of the winding groups 131 to 133, the windings 121 are connected in series via the connecting wires 122. FIG.

In this way, all the connecting wires 122 can be arranged on the opposite side (opposite side) of the first lead wire 123 with respect to the stator 103 . Moreover, it is only necessary to set the number of turns Na of the first winding 121a to be half less than the number of turns Nb of the other windings 121b.

As shown in FIGS. 1 and 3, all the connecting wires 122 are wound around the outer peripheral surface of the second end portion 103b (second insulator 113) of the stator 103, that is, the radially outer side of the stator 103. there is

Thus, the stator 103 has a first end 103a on the bottom wall 21 side of the housing 20 (inverter device 160 side) and a second end 103b on the opening 22 side of the housing 20 (compression mechanism 50 side). have. All the

lead wires

123, 124 of the stator 103 are pulled out from the first end 103a of the stator 103 located on the inverter device 160 side, and can be easily connected to the inverter device 160 through the bottom wall 21 of the housing 20. can be done.

In addition, all the connecting wires 122 of the stator 103 are arranged at the second end portion 103b of the stator 103 located on the compression mechanism 50 side. It is positioned on the side of the opening 22 in the first inner peripheral surface 23 a) of the storage chamber 23 . Thus, the crossover wire 122 is positioned radially outside of the stator 103 , that is, close to the inner peripheral surface 20 a of the housing 20 . In order to properly secure electrical insulation from the connecting wire 122, it is necessary to secure a sufficient distance (insulation distance) between the connecting wire 122 and the inner peripheral surface 20a.

On the other hand, for example, when the housing 20 is formed by casting, the inner peripheral surface 20a on the side of the opening 22 (the first inner peripheral surface 23a of the first storage chamber 23) is radially moved in the preparation stage of the mold. It can be expanded in advance. More specifically, as shown in FIGS. 1 and 2, a radially enlarged recess 20b is formed in the first inner peripheral surface 23a of the first storage chamber 23 at the end on the second storage chamber 24 side. can be set. As a result, a space (insulation distance) between the crossover wire 122 and the inner peripheral surface 20a can be secured.

For this reason, it is not necessary to partially cut the inner peripheral surface 20a in a post-process in order to ensure the spacing (insulation distance) between the inner peripheral surface 20a of the housing 20 and the connecting wire 122. Since cutting is not required, there is no need to consider the thickness of the cut portion. Moreover, even if cutting is performed, it is possible to suppress the machining margin to the minimum required. Therefore, the production cost of the electric compressor 10 can be suppressed.

However, in this state, as shown in FIG. 6, the number of turns Na of each first winding 121a is set to be less than the number of turns Nb of the other windings 121b by a half turn. 121, the number of turns Na of one winding 121a remains different from the number of turns Nb of the other. The magnetic flux of the first winding 121a will be different from the magnetic flux of the other windings 121b.

Therefore, in order to match the magnetic fluxes of all the windings 121 as much as possible, an additional winding 121d is arranged for the teeth 111c around which the first winding 121a is wound. The configuration of the additional winding 121d will be described in detail below.

As shown in FIGS. 5 and 6, in each of the plurality of winding groups 131 to 133, the winding end portion 121ce of the last winding 121c is connected to the first winding 121a via the return connecting wire 122a. return to the tooth 111c (including the vicinity of the tooth 111c). That is, the plurality of crossover wires 122 are return crossover wires 122a that return from the other winding 121b (the last winding 121c) to the teeth 111c (including the vicinity of the teeth 111c) around which the first winding 121a is wound. including. All the connecting wires 122, including the return connecting wire 122a, extend in the same direction, for example, the circumferential direction of the stator 103 (arrow A1 direction).

An additional winding 121d is continuous with the return connecting wire 122a, passing along only half the circumference of the tooth 111c around which the first winding 121a is wound. The additional winding 121d extends only half a turn around the tooth 111c around which the first winding 121a is wound, from the return connecting wire 122a to the second lead wire 124, and in the winding direction of the first winding 121a (arrow A2 direction). ) in the same direction as That is, the additional winding 121d adds approximately half a turn to the first winding 121a. The small number of turns Na of the first winding 121a can be compensated for by the additional winding 121d. As a result, the magnetic flux of the first winding 121a can be supplemented to be similar to the magnetic flux of the other windings 121b.

In this manner, the plurality of first and second

lead wires

123, 124 and the plurality of crossover wires 122 are arranged on opposite sides of the stator 103, and the magnetic flux of the first winding 121a is transferred to other It can be compensated to be similar to the magnetic flux of winding 121b.

Moreover, in each of the plurality of winding groups 131 to 133, the number of turns Na of at least one of the plurality of windings 121 is different from the other number of turns Nb. All can be easily positioned opposite the first and second lead lines 123,124.

The above explanation can be summarized as follows. In each of the plurality of winding groups 131 to 133, the number of turns Na of the first winding 121a is set to be half less than the number of turns Nb of the other windings 121b. One number of turns Na is different from the other number of turns Nb. For this reason, all of the plurality of crossover wires 122 can be connected to the stator 103 by a simple configuration in which the number of turns Na of the first winding 121a is half less than the number of turns Nb of the other windings 121b. It can be easily positioned on the side opposite to the first and second lead lines 123,124.

Referring to FIG. 4, as described above, the respective first windings 121a of the plurality of winding groups 131 to 133 are arranged side by side in order in the circumferential direction of the stator 103 (arrow A1 direction). The respective first and second

lead wires

123, 124 of the plurality of winding groups 131-133 are aligned side by side in the circumferential direction of the stator 103 (arrow A1 direction).

That is, all the first windings 121a and all the first and second

lead wires

123, 124 are concentrated in the stator 103 by being centrally located around each first winding 121a. It is compact and easy to wire to the inverter device 160 .

Here, the connection structure between the first and second

lead wires

123 and 124 and the inverter device 160 will be described with reference to FIGS. 1 and 4. FIG.

As shown in FIG. 1, the end surface 112a of the first end portion 103a (the end surface 112a of the first insulator 112) of the stator 103 stored in the first storage chamber 23 faces the bottom wall 21 of the housing 20. and close to each other. An electrical connector 144 (cluster block 144) having three terminals 141 to 143 (receptacles 141 to 143) is arranged on the end face 112a side of the first end portion 103a. At least the first lead wires 123 are individually connected to the three terminals 141 to 143 .

A relay terminal 152 having three terminal pins 151 is provided on the bottom wall 21 of the housing 20 . Each terminal pin 151 extends from inside housing 20 into inverter housing 32 along center line CL<b>1 of stator core 111 . One end of these terminal pins 151 can be fitted with three terminals 141 to 143 .

The inverter device 160 includes a configuration that is provided directly or indirectly with respect to the outer wall surface 21a of the bottom wall 21 of the housing 20. For example, the inverter device 160 is detachably housed inside the inverter housing 32 so as to be indirectly provided on the outer wall surface 21 a of the bottom wall 21 of the housing 20 . As another example, the inverter device 160 is directly provided on the outer wall surface 21a of the bottom wall 21 of the housing 20 without the bottom wall 32a of the inverter housing 32 interposed therebetween. This inverter device 160 comprises a substrate 162 on which control components 161 such as an inverter circuit are mounted, and an inverter-side connector 163 provided on this substrate 162 . This inverter-side connector 163 can be connected to the other end of the terminal pin 151 .

By assembling the stator 103 into the housing 20, the three terminals 141 to 143 are individually fitted onto the respective terminal pins 151. As shown in FIG. By assembling the inverter device 160 into the inverter housing 32 , the inverter side connector 163 is connected to each terminal pin 151 . As a result, each first lead line 123 is electrically connected to the inverter device 160 . Drive power can be supplied from the inverter device 160 to the motor 100 .

As shown in FIG. 4, all the first and second

lead wires

123, 124 of the multiple winding groups 131-133 are delta-connected. A detailed description is given below. Here, the three terminals 141 to 143 will be described separately from the first terminal 141, the second terminal 142, and the third terminal 143. FIG. The first terminal 141 is connected to the first lead wire 123 of the U-phase winding group 131 and the second lead wire 124 of the W-phase winding group 133 . The first lead wire 123 of the V-phase winding group 132 and the second lead wire 124 of the U-phase winding group 131 are connected to the second terminal 142 . The first lead wire 123 of the W-phase winding group 133 and the second lead wire 124 of the V-phase winding group 132 are connected to the third terminal 143 .

In this way, by delta connecting all the first and second

lead wires

123, 124 concentratedly arranged around each first winding 121a, all the first lead wires connected to the inverter device 160 are connected to the inverter device 160. And the length of the

second lead lines

123, 124 can be shortened as much as possible. Since the first and second

lead wires

123 and 124 are shortened, the copper loss of each winding group 131 to 133 can be improved and the weight of the motor 100 (see FIG. 1) can be reduced.

As shown in FIG. 6, the end portion 121de of the additional winding 121d is fixed to the first end 103a (first insulator 112) of the stator 103. For example, as shown in FIG. 7, the end portion 121de has a hook 112b integrally formed on the first end portion 103a (first insulator 112) or a hole (not shown) to which a tie string, thin wire, or the like is attached. It is fixed to the stator 103 by a so-called lacing process that is tied together by a wire 171 .

By fixing the terminal end portion 121de of the additional winding 121d to the first end portion 103a in this way, the additional winding 121d is reliably laid along the teeth 111c shown in FIG. can be maintained at Similarly, the starting end portion 121ds of the additional winding 121d is also fixed to the second end portion 103b. Therefore, the small number of turns of the first winding 121a can be reliably compensated for by the additional winding 121d.

Similarly, the winding end portion 121ae of each first winding 121a is fixed to the second end 103b of the stator 103. A start portion 121bs and an end portion 121be of each other winding 121b are fixed to the second end 103b. Therefore, the winding state of each winding 121 can be reliably maintained without slack or slack.

As is clear from the above description, in the first embodiment, in the electric compressor 10 in which the motor 100 is provided on the inner bottom wall 21 side of the bottomed cylindrical housing 20, the quality of the housing 20 is ensured. While doing so, the production cost of the electric compressor 10 can be suppressed.

<Example 2>
Next, the electric compressor 200 of Example 2 is demonstrated, referring FIG.8 and FIG.9. FIG. 8 schematically shows the arrangement of a plurality of conducting wires 120 with respect to the stator core 111 when the stator 103 of the electric compressor 200 according to the second embodiment is deployed to the outer peripheral side, corresponding to FIG. there is

In the electric compressor 200 of the second embodiment, in the stator 103 of the electric compressor 10 of the first embodiment shown in FIGS. A feature is that the

lines

123 and 124 are star-connected. Other basic configurations are common to the electric compressor 10 according to the first embodiment. Reference numerals are used for parts that are common to the electric compressor 10 according to the first embodiment, and detailed description thereof is omitted.

Specifically, only the first lead wire 123 of the U-phase winding group 131 is connected to the first terminal 141 . Only the first lead wire 123 of the V-phase winding group 132 is connected to the second terminal 142 . Only the first lead wire 123 of the W-phase winding group 133 is connected to the third terminal 143 . The second lead wires 124 of all winding groups 131 to 133 are connected together as a neutral point 201 of star connection.

Therefore, the first lead wires 123 can be individually connected to the inverter device 160 (see FIG. 1), and the second lead wires 124 can be connected together as a neutral point 201 of the star connection. . Each first lead wire 123 and the neutral point 201 can be collected at one location on the stator 103 . In other words, the electric connector 144 and the neutral point 201, which bulge out around the stator 103, can be gathered in one place on the stator 103, so that the motor 100 itself can be made compact.

As shown in FIG. 9, all the second lead wires 124 are connected without being fixed to the stator 103, that is, without being connected to the terminals 141 to 143 (see FIG. 1) fixed to the stator 103. They are integrated with each other by soldering or welding. Therefore, all the second lead wires 124 can be easily integrated as the neutral point 201 of the star connection by soldering or welding. A portion of the neutral point 201 is covered by an electrically insulating sleeve 202 . Furthermore, the electric compressor 200 according to the second embodiment can exhibit effects similar to those of the first embodiment.

In the second embodiment, when the second lead wire 124 is too long, a wire rod 204 such as a tying thread or a thin wire is attached to a hole 203 having a middle part of the wire in the first end 103a or a hook (not shown). It is possible to fix to the stator 103 by applying a so-called lacing process that is tied by

As is clear from the above description, in the

motors

100 and 200 of the first and second embodiments, all the connecting wires 122 and all the

lead wires

123 and 124 are arranged in opposite directions with respect to the stator 103. However, it is an extremely effective technique. This technique can also be applied to a technique of housing only the motor 100 (for example, not housing the compression mechanism 50) in the housing 20 (motor housing 20).

It should be noted that the electric compressor 10; 200 according to the present invention is not limited to the embodiment as long as the action and effect of the present invention are exhibited.
The compression mechanism 50 is not limited to the configuration of the scroll compression mechanism, and may be driven by the drive shaft 41 to compress gas (eg, gaseous refrigerant).

The electric compressor 10; 200 of the present invention is suitable for use in the refrigerating cycle of a vehicle air conditioner.

Reference Signs List

10, 200 electric compressor 20 housing 20a inner peripheral surface 21 bottom wall 21a outer wall surface 22 opening 50 compression mechanism 100 motor 102 rotor 103 stator 103a first end 103b second end 110 stator core assembly 111 stator core 111c teeth 120 conducting wire 121 winding 121a first winding 121as winding start portion 121ae winding end portion 121b other winding 121bs winding start portion 121be winding end portion 121c last winding 121ce winding end portion 121d additional winding 121de end portion 121ds start portion 122 transition Wire 122a Return connecting wire 123 First lead wire 124 Second lead wire 131 U-phase winding group 132 V-phase winding group 133 W-phase winding group 160 Inverter device 201 Neutral point of star connection A1 Circumference of stator Direction A2 Winding direction of first winding CL1 Longitudinal centerline of housing (centerline of stator core)
Na Number of turns of first winding Nb Number of turns of other windings R1 Inverter device side R2 Compression mechanism side

Claims

a compression mechanism (50) for compressing gas;
a motor (100) that drives the compression mechanism (50);
an inverter device (160) that supplies driving power to the motor (100);
a bottomed cylindrical member having a housing (20) for housing the motor (100) therein;
At least part of the compression mechanism (50) is provided on the opening (22) side inside the housing (20),
The inverter device (160) is provided in the electric compressor (10; 200) provided on the outer wall surface (21a) of the bottom wall (21) of the housing (20),
The motor (100) includes a rotor (102) whose center of rotation is the longitudinal direction of the housing (20), and an inner peripheral surface (20a) of the housing (20) arranged radially outside the rotor (102). ), an annular stator (103) fixed to the
The stator (103) includes a stator core (111) formed with a plurality of teeth (111c) arranged at equal pitches in the circumferential direction (A1), and a plurality of teeth (111c) wound around the plurality of teeth (111c). a conductor (120);
The plurality of conducting wires (120) are composed of a plurality of windings (121) individually wound around the plurality of teeth (111c) by concentrated winding and a plurality of jumpers connecting the plurality of windings (121). A wire (122), a first lead wire (123) drawn from the winding start of the conductor (120), and a second lead wire (124) drawn from the winding end of the conductor (120),
The first and second lead lines (123, 124) are led out from a first end (103a) of the stator (103) located on the inverter device (160) side,
At least one of the first and second lead lines (123, 124) is connected to the inverter device (160),
The electric compressor, wherein the plurality of connecting wires (122) are all arranged at a second end (103b) of the stator (103) located on the side of the compression mechanism (50). .
The plurality of conducting wires (120) constitute a plurality of winding groups (131 to 133) for three-phase alternating current,
In each of the plurality of winding groups (131 to 133), the plurality of windings (121) are connected in series via the plurality of connecting wires (122),
In each of the plurality of winding groups (131 to 133), the stator (103 ), all of the plurality of connecting wires (122) are located on the opposite side of the first and second lead wires (123, 124). electric compressor.
In each of the plurality of winding groups (131 to 133), the number of turns (Na) of the first winding (121a) is set to be half less than the number of turns (Nb) of the other windings (121b). The electric compressor according to claim 2, wherein the number of turns (Na) of one of the plurality of windings (121) is different from the number of turns (Nb) of the other windings (121).
The plurality of crossover wires (122) include a return crossover wire (122a) returning from the other winding (121b) to the teeth (111c) around which the first winding (121a) is wound,
The return crossover wire (122a) is continuous with an additional winding (121d) passing along only half the circumference of the teeth (111c) around which the first winding (121a) is wound,
The additional winding (121d) extends from the return crossover wire (122a) to the second lead wire (124) with respect to the teeth (111c) around which the first winding (121a) is wound, and The electric compressor according to claim 3, characterized in that it extends in the same direction as the winding direction (A2) of the first winding (121a).
The electric compressor according to claim 4, wherein the end portion (121de) of the additional winding (121d) is fixed to the first end (103a) of the stator (103).
The first windings (121a) of the plurality of winding groups (131 to 133) are arranged side by side in order in the circumferential direction (A1) of the stator (103),
The first and second lead wires (123, 124) of the plurality of winding groups (131 to 133) are arranged side by side in order in the circumferential direction (A1) of the stator (103). The electric compressor according to any one of claims 3 to 5, characterized by:
The electric compressor according to claim 6, wherein all the first and second lead wires (123, 124) of the plurality of winding groups (131-133) are delta-connected. .
The electric compressor according to claim 6, wherein all the first and second lead wires (123, 124) of the plurality of winding groups (131 to 133) are star-connected. .
9. The electric motor according to claim 8, characterized in that all the second lead wires (124) are not fixed to the stator (103) but are integrated with each other by soldering or welding. compressor.