JP6004708B2 - Three-phase AC motor and electric compressor provided with the same - Google Patents

Description

The present invention relates to a three-phase AC motor suitable for being applied to a motor for driving an electric compressor or the like of a vehicle air conditioner, and an electric compressor including the same.

  In a vehicle air conditioner mounted on an electric vehicle, a hybrid vehicle, or the like, an electric compressor in which an inverter is integrated is used. In such an electric compressor, a three-phase AC motor to which three-phase AC power converted through an inverter is applied is used as a compressor driving motor. Since such an inverter-integrated electric compressor is mounted in an engine room, it is required to be miniaturized as much as possible. Therefore, miniaturization of a motor is also strongly demanded.

  In this three-phase AC motor, a concentrated winding (also referred to as direct winding) motor is used. In the stator, a plurality of teeth portions provided on the inner peripheral side of the stator core are made of a resin material or the like. In some cases, the crossover wires of the U, V, and W phase stator windings wound via an insulating coil bobbin and the neutral point with the star connection at the tip are arranged on the outer periphery of the coil bobbin. there were. For this reason, in this motor, the outer shape of the stator itself tends to increase.

  On the other hand, in Patent Document 1, a wiring processing member having a protrusion for processing a connecting wire or a terminal wire is placed on a coil end portion of a stator, and the connecting wire or A motor in which terminal wires are fixedly arranged and a stator thereof are disclosed.

JP 2003-158845 A

  However, as described above, when the connecting wire of each phase stator winding of the U, V, and W phases and the neutral point connecting the tip thereof are arranged on the outer peripheral side of the insulating bobbin, the stator itself Since the outer shape tends to be larger, it has not been able to fully meet the needs for motor miniaturization. Further, as shown in Patent Document 1, when the wiring processing member is placed on the coil end portion, the length in the axial direction becomes long, and thus there is a similar problem. In particular, in order to simplify and reduce the cost of the stator winding, a 1 star series winding structure has a larger number of crossovers than a multi-star winding method such as a 3 star type, Since the total crossover line length becomes long, the processing has been a problem.

The present invention has been made in view of such circumstances, and can satisfy a need for miniaturization and cost reduction of a motor, and can arrange a large number of connecting wires with sufficient insulation distance and well-placed. An object of the present invention is to provide a three-phase AC motor that can be used and an electric compressor including the same.

In order to solve the above-described problems, the three-phase AC motor of the present invention and the electric compressor including the same employ the following means.
That is, in the three-phase AC motor according to the present invention, U, V, and W-phase stator windings are respectively provided on a plurality of teeth provided on the inner peripheral side of the stator core via insulating coil bobbins. In a three-phase AC motor having a concentrated winding stator, each phase stator winding has a 1 star series winding structure, and between each coil of each phase stator winding Are connected to the coil end portions at both ends of the stator, and a part of the connecting wire is connected to the end of the coil end portion opposite to the one end side where the rotor of the stator is inserted. It is arranged on the peripheral side via a crossover holding part, and another part is the outer peripheral side of the coil bobbin of the coil end part on the one end side of the stator and / or the coil end part on the opposite side. It is disposed on the outer peripheral side of the coil bobbin And wherein the door.

In a three-phase AC motor, each phase stator winding of U, V, and W phases has a one-star series winding structure, so that the number of winding connection points can be reduced and the number of connection steps can be reduced. However, the problem is how to arrange the crossover lines for three phases. The crossover wire is usually arranged on the outer periphery of the coil bobbin in the coil end portion of the stator. However, if the number of crossover wires is large and long, the outer diameter or height of the coil end portion is increased, resulting in a small size. However, the distance from the motor housing becomes short, and it becomes difficult to secure an insulation distance.
According to the present invention, each of the U, V, and W phase stator windings has a 1-star series winding structure, and the connecting wire connecting the coils of each phase stator winding. All or part of the stator windings are arranged on the inner peripheral side of the coil end portion opposite to the one end side where the stator rotor is inserted via the crossover holding portion. The inner circumference of the coil end on the opposite side of the stator that does not affect the incorporation of the rotor while reducing the number of connection points and reducing the number of connection steps by adopting a 1 star series winding structure By using the side space, all or part of the crossover line can be arranged in the space. Accordingly, it is possible to arrange a large number of crossovers with sufficient insulation distance and well-spaced arrangement while maintaining the cost reduction effect by reducing the size of the motor and the number of connecting steps, and further maintaining the assembling property.

  Furthermore, the three-phase AC motor of the present invention is the above-described three-phase AC motor, wherein the jumper wires are divided and arranged with respect to the coil end portions on both ends of the stator, and a part thereof is the stator. Is arranged on the inner peripheral side of the coil end portion on the opposite side of the coil via the crossover holding portion, and the other part is the coil end portion on the one end side of the stator and / or the opposite side of the stator. It is arrange | positioned at the outer peripheral side of the said coil bobbin of a coil end part, It is characterized by the above-mentioned.

  According to the present invention, the connecting wire is divided and arranged with respect to the coil end portions on both ends of the stator, and a part of the connecting wire is held on the inner peripheral side of the coil end portion on the opposite side of the stator. Since the other part is arranged on the outer peripheral side of the coil bobbin of the coil end part on one end side and / or the coil end part on the opposite side of the stator, the number of connecting wires is large. Even if it is not possible to arrange all of them in the inner circumferential space of the coil end part on the opposite side of the stator via the crossover holding part, a part of the coil end part and / or the opposite side of the coil end part cannot be arranged. By arranging the coil end part on the outer peripheral side of the coil bobbin, it is possible to arrange all the connecting wires at the coil end parts on both ends of the stator without increasing the outer diameter or height of the coil end part on one end side. it can. Therefore, even in the case of a motor having a large number of coils and a large number of crossovers, it is possible to cope with the problem by arranging the crossovers separately.

  Furthermore, the three-phase AC motor according to the present invention is the insulating three-phase AC motor according to any one of the above-described three-phase AC motors, wherein the crossover holding portion is disposed on the coil end portion on the opposite side of the stator. It is characterized by being integrally formed with.

  According to the present invention, since the crossover holding part is integrally formed with the insulating coil bobbin disposed on the coil end part on the opposite side of the stator, the front part or part of the crossover is connected to the stator. The stator can be configured without increasing the number of components even if the connecting end holding portion is arranged on the inner peripheral side of the coil end portion on the opposite side. Therefore, it is possible to suppress the assembly man-hours and the cost increase due thereto.

  Furthermore, the three-phase AC motor of the present invention is the above-described three-phase AC motor, wherein the crossover holding portion has a U-shaped cross-sectional shape, and the opening portion is outside the rotation axis direction of the stator. It is characterized by opening toward the inner side or the inner side.

According to the present invention, the crossover holding portion has a U-shaped cross-sectional shape, and the opening is opened toward the outer side or the inner side in the rotation axis direction of the stator. If it can be accommodated in the recess of the crossover holding part with a U-shaped cross section, and the opening is opened outward, the work when winding the stator winding In the case where the opening is opened toward the inward side while ensuring the property, the connecting wire can be accommodated and disposed in the concave portion of the connecting wire holding portion while further improving the insulating property. Therefore, in any case, the connecting wire can be well arranged in the inner circumferential space of the coil end portion on the opposite side of the stator via the connecting wire holding portion.
Moreover, you may apply an above-described three-phase alternating current motor to the electric compressor of a vehicle air conditioner.

  According to the present invention, each phase stator winding has a one-star series winding structure, thereby reducing the number of connection points of the windings and reducing the number of connection man-hours. By using the space on the inner circumference of the coil end on the opposite side of the stator that is not present, all or part of the jumper can be placed in the space, thus reducing costs by reducing the size of the motor and reducing the number of connection steps While maintaining the effect and the assembling property, it is possible to arrange a large number of connecting wires with a sufficient insulation distance and with good fit.

It is a side view of the stator of the three phase AC motor concerning one embodiment of the present invention. It is a top view of the stator shown in FIG. It is a schematic diagram of the connection state of each phase stator winding | winding of the stator shown in FIG. It is a top view of the stator core of the stator shown in FIG. It is a longitudinal cross-sectional equivalent view of the three-phase alternating current motor shown in FIG.

An embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 shows a side view of a stator of a three-phase AC motor according to an embodiment of the present invention, and FIG. 2 shows a plan view thereof. FIG. 3 is a schematic diagram of the connection state of each phase stator winding, FIG. 4 is a plan view of the stator core, and FIG. 5 is a vertical cross-sectional view of a three-phase AC motor. ing.
A stator 1 constituting a motor is configured by winding U, V, and W phase stator windings 3, 4, and 5 around a cylindrically formed stator core 2. Is.

  The stator core 2 is configured by laminating a predetermined number of annular plate materials obtained by punching and forming electromagnetic steel plates and integrally connecting them by caulking, welding, or the like. As shown in FIG. 4, slots 6 serving as winding spaces are provided at a plurality of locations (9 locations in the present embodiment) at equal intervals on the circumference on the inner peripheral surface side of the stator core 2. The tooth portions 7 are formed at nine locations between the slots 6.

  As is well known, nine stator portions 2 of the stator core 2 are provided with U, V, and W phase stator windings 3, 4, 5 via insulating coil bobbins 8 made of a resin material or the like. Is to be wound. The stator windings 3, 4, 5 of each phase are connected to U-phase coils U 1, U 2, U 3, V-phase coils V 1, V 2, V 3, W-phase via coil bobbins 8 with respect to nine tooth portions 7. The coils W1, W2, and W3 are concentratedly wound (also referred to as direct winding). These stator windings 3, 4, 5 and their respective coils U 1 to W 3 are star-connected at the neutral points 9 at the tips 3 A, 4 A, 5 A of the respective phase stator windings 3, 4, 5. As shown in FIG. 3, a one-star series winding structure is adopted.

  As shown in FIG. 2, the coils U1 to W3 of the phase stator windings 3, 4 and 5 have slots 6 provided in the stator core 2 as shown in FIG. 5 is concentrated around the tooth portion 7 and wound around the tooth portion 7 as a winding space for forming the coils U1 to W3. Thus, the phase stator windings 3, 4, and 5 are wound around the insulating coil bobbin 8 so that the winding height gradually increases in the motor axial direction. Coil end portions 2A and 2B are formed on both ends of the iron core 2, respectively.

  On the other hand, the U, V and W phase stator windings 3, 4 and 5 are wound around a plurality of teeth 7 of the stator core 2 via insulating coil bobbins 8 to form coils U1 to W3, respectively. As shown in FIG. 2, between each coil U1, U2, U3 of each phase stator winding 3, 4, 5, between coils V1, V2, V3, and between coils W1, W2, W3. The connecting wires 10, 11, 12, 13, 14, and 15 are required to connect to each other, and the connecting wires 10 to 15 and the winding tips 3 </ b> A, 4 </ b> A, and 5 </ b> A must be arranged in the coil end portions 2 </ b> A and 2 </ b> B. I must.

  In the present embodiment, the connecting wires 10 to 15, that is, connecting wires 10 and 11 connecting the coils U1 and U2, U2 and U3, connecting wires 12 and 13 connecting the coils V1 and V2, and V2 and V3, respectively. Among the connecting wires 14 and 15 connecting the coils W1 and W2 and W2 and W3, the connecting wires 10 to 13 are inserted into the stator 2 by inserting the rotor 17 into the coil end portion 2A on one end side. The other connecting wires 14 and 15 are arranged on the outer peripheral side of the insulating coil bobbin 8 and are arranged on the inner peripheral side of the coil end portion 2B on the opposite side via the connecting wire holding portion 16.

  As shown in FIG. 5, the rotor 17 must be inserted into the inner cylinder of the stator 2 and incorporated from one end side. Therefore, it is impossible to dispose a crossover or the like on one end side of the stator 2, here, on the inner periphery on the coil end portion 2 </ b> A side, because this prevents the rotor 17 from being incorporated.

  When there is a space in the inner circumference of the stator 2 on the coil end portion 2B side, the crossover wires 10 to 15 are all arranged via the crossover wire holding portion 16. If the balance weight 18 is provided at the end of the rotor 17 as in the present embodiment and there is not enough space, a part of the balance weight 18 is provided as shown in FIG. May be divided and arranged on the outer peripheral side of the coil end portion 2A and the inner peripheral side of the coil end portion 2B. In addition, what is necessary is just to set the ratio at the time of dividing and arranging the crossovers 10 thru | or 15 in consideration of each space.

  The crossover holding portion 16 has a U-shaped cross-sectional shape, and is integrally formed with an inner diameter side flange portion 8A of a coil bobbin 8 made of a resin material provided on the coil end portion 2B side. As shown in FIG. 5, the crossover holding portion 16 has an opening 16A having a U-shaped cross section that opens toward the outer side in the rotation axis direction of the stator 2 or on the inner side. In either case, the connecting wire, here, the connecting wires 14 and 15 are arranged in the recess.

  In the present embodiment, as shown in FIG. 2, the crossover holding part 16 is provided only for the coil bobbin 8 installed in the range where the crossovers 14 and 15 cross. This connecting wire holding part 16 should just be installed corresponding to the range where a connecting wire is arranged, for example, when arranging all the connecting wires on the inner peripheral side of coil end part 2B, all coil bobbins 8 are provided. The connecting wire holding part 16 is integrally formed with the inner diameter side flange part 8A.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
The U, V, and W wires connected to the U, V, and W terminals on the inverter side are respectively connected to the teeth portion 7 of the stator core 2 via an insulating coil bobbin 8 on the stator 1 side of the motor. The coils U1, U2, U3, coils V1, V2, V3 and coils W1, W2, W3 are concentratedly wound. At this time, the connecting wires 10 to 15 of the coils U1 to W3 are divided and arranged on the outer peripheral side of the coil bobbin 8 on the coil end portion 2A side and the inner peripheral side of the coil bobbin 8 on the coil end portion 2B side.

  As a result, by adopting a 1 star type series winding structure for the U, V, W phase stator windings 3, 4 and 5, the number of crossovers 10 to 15 is increased, and the total crossover Even if the length is increased, the connecting wires 10 to 15 can be arranged without increasing the outer diameter and height of the coil end portion 2A. In other words, in a three-phase AC motor, the U, V, W phase stator windings 3, 4, 5 have a 1 star series winding structure to reduce the number of winding connection points (for example, In the case of a 9-slot stator, the number of connection points can be reduced from 6 points to 4 points by changing from 3Y connection to 3 series 1Y connection), and the connection man-hours can be reduced.

  However, it has been a problem how to arrange the three-phase crossover wires 10 to 15 that are increased by adopting a one-star series winding structure. The connecting wires 10 to 15 are generally arranged on the outer peripheral side of the coil bobbin 8 in the coil end portion 2A of the stator 2. However, when the number of the connecting wires 10 to 15 is large and the length is increased, the coil end portion 2A is arranged. The outer diameter or height of the motor is increased, and there is a need to sacrifice size reduction, and since the distance from the motor housing is reduced, problems such as difficulty in securing an insulation distance arise.

  However, each of the coils U1, U2, U3, coils V1, V2, V3 of the U, V, W phase stator windings 3, 4, 5 and the connecting wires 10-15 connecting the coils W1, W2, W3. All or part of the stator 2 is arranged on the inner peripheral side of the coil end portion 2B opposite to the one end side where the rotor 17 of the stator 2 is inserted via the crossover holding portion 16, thereby The phase stator windings 3, 4, 5 have a one-star series winding structure, thereby reducing the number of connection points of the windings and reducing the number of connection man-hours while affecting the incorporation of the rotor 17. The space on the inner peripheral side of the opposite coil end portion 2B of the stator 2 that is not present can be used, and all or part of the crossover wires 10 to 15 can be arranged in the space.

  Therefore, it is possible to secure a sufficient insulation distance for the connecting wires 10 to 15 having a large number and a long length while maintaining the assembling property while reducing the cost by reducing the size of the motor and reducing the number of connecting steps. It is possible to arrange well.

  Further, when the balance weight 18 is provided at the end of the rotor 17 and sufficient space cannot be secured on the inner peripheral side of the coil end portion 2B, the connecting wires 10 to 15 are connected to the coils on both ends of the stator 2. What is necessary is just to divide | segment and arrange | position with respect to the end parts 2A and 2B. That is, for example, a part of the crossover wires 14 and 15 among the many crossover wires 10 to 15 are arranged on the inner peripheral side of the coil end portion 2A opposite to the stator 2 via the crossover wire holding portion 16, Other part of the crossover wires 10 to 13 can be arranged on the outer peripheral side of the coil bobbin 8 of the coil end portion 2A on one end side of the stator 2.

  For this reason, even when the number of the crossover wires 10 to 15 is large and all of them cannot be arranged in the inner peripheral space of the coil end portion 2B on the opposite side of the stator 2 via the crossover wire holding portion 16, By arranging a part of the coil 2 on the outer peripheral side of the coil bobbin 8 of the one end side coil end portion 2A of the stator 2, all the crossover wires 10 or 10 are increased without increasing the outer diameter or height of the one end side coil end portion 2A. 15 can be divided and arranged in the coil end portions 2A and 2B on both ends of the stator. Therefore, even in the case of a motor having a large number of coils and a larger number of crossover wires 10 to 15, it is possible to cope with this by arranging the crossover wires 10 to 15 in a divided manner.

  Further, in the present embodiment, the crossover holding part 16 is formed integrally with the inner diameter side flange part 8A of the insulating coil bobbin 8 provided in the coil end part 2B on the opposite side of the stator 2. Yes. For this reason, even if the front part or a part of the connecting wires 10 to 15 is arranged on the inner peripheral side of the coil end part 2B on the opposite side of the stator 2 via the connecting wire holding part 16, the number of parts is reduced. The stator 2 can be configured without increasing it. Therefore, it is possible to suppress the assembly man-hours and the cost increase due thereto.

  Further, the crossover holding portion 16 has a U-shaped cross-sectional shape, and the opening portion 16 </ b> A is opened toward the outer side or the inner side in the rotation axis direction of the stator 2. For this reason, the crossover wires 10 to 15 can be accommodated in the concave portion of the crossover holding portion 16 having a U-shaped cross section, and when the opening portion 16A is opened outward. While ensuring the workability when winding the stator windings 3, 4, and 5, and when the opening 16 </ b> A is opened toward the inner side, the insulation is further enhanced. The connecting wires 10 to 15 can be accommodated in the recesses of the connecting wire holding part 16. Therefore, in any case, the crossover wires 10 to 15 can be arranged in the inner space of the coil end portion 2B opposite to the stator 2 through the crossover wire holding portion 16 in a well-contained manner.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the above-described embodiment, the example of the 9-slot stator 1 in which the slots 6 are provided at 9 locations on the circumference at equal intervals with respect to the stator core 2 has been described, but the present invention is limited to this. Of course, the present invention can be similarly applied to 6 slots, 12 slots or more.

  Moreover, although the said embodiment demonstrated the example which divided | segmented the connecting wires 10 thru | or 15 into the inner peripheral side of the coil end part 2B, and the outer peripheral side of the coil end part 2A, when there are many connecting wires Is not limited to the outer peripheral side of the coil end portion 2A, but the outer peripheral side of the coil end portion 2B (the broken line on the outer periphery of the coil end portion 2B in FIG. 5). Or the both may be divided, and in this case, the same effect can be obtained.

DESCRIPTION OF SYMBOLS 1 Stator 2 Stator iron core 2A One end side coil end part 2B Opposite side coil end part 3, 4, 5 Each phase stator winding (U, V, W phase stator winding)
7 Teeth portion 8 Coil bobbins 10 to 15 Crossover wire 16 Crossover wire holding portion 16A Opening portion 17 Rotor U1, U2, U3 Coil V1, V2, V3 Coil W1, W2, W3 Coil

Claims (4)

Three-phase including a stator in which U, V, and W-phase stator windings are concentratedly wound on each of a plurality of teeth provided on the inner peripheral side of the stator core via insulating coil bobbins. In AC motors,
Each of the phase stator windings has a 1 star type series winding structure,
The connecting wire connecting the coils of each phase stator winding is divided and arranged with respect to the coil end portions on both ends of the stator, and a part thereof is one end into which the rotor of the stator is inserted. Arranged on the inner peripheral side of the coil end portion on the opposite side of the coil via the crossover holding portion, and the other part is the outer peripheral side of the coil bobbin of the coil end portion on the one end side of the stator and 3. A three-phase AC motor, wherein the three-phase AC motor is disposed on the outer peripheral side of the coil bobbin at the coil end portion on the opposite side . 2. The three-phase AC motor according to claim 1 , wherein the crossover holding portion is integrally formed with the insulating coil bobbin disposed at the coil end portion on the opposite side of the stator. The crossover holding portion has a U-shaped cross-sectional shape, and an opening thereof opens toward an outer side or an inner side in the rotation axis direction of the stator. The three-phase AC motor described in 2 .   The electric compressor of the vehicle air conditioner provided with the three-phase alternating current motor in any one of Claims 1-3.

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