JP2004072857A - Stator of motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator capable of realizing high quality by reducing insulation failure in the stator of a motor and high occupation rate of a winding occupying a slot. <P>SOLUTION: In the stator of the motor, the number of poles is 2n (n: Integer) and the number of stator slots is 3n. The stator is provided with an upper cover, and a lower cover for covering a coil end on both ends of the stator. The upper cover and the lower cover include inside-diameter walls extending at least in the axial direction of the stator at a position corresponding to the wiring provided on a gear, and are fixed so as to pinch the stator by resin insulation of T shape in cross section. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for an electric motor used for industrial, office, home appliance, and vehicle use, which is capable of reducing insulation failure and increasing a space factor of windings occupying slots. .
[0002]
[Prior art]
BACKGROUND ART Conventionally, in a motor used for industrial equipment, office equipment, household electrical equipment, and on-vehicle use, a winding 103 of a concentrated winding method, which is directly wound on a tooth 102 of a stator 101 as shown in FIG. Is given. The slot 104 of the stator 101 is provided with a bobbin 105 integrally formed of resin or the like, and insulates the winding 103 from the iron core of the stator 101. The bobbin 105 that insulates the iron core of the stator 101 from the winding 103 covers the upper and lower end surfaces of the stator 101 with integrally molded resin. In addition, the inner wall surface of the slot 104 is covered with a resin and reliably insulates the winding 103 wound around the tooth portion 102 of the stator 101.
[0003]
In addition, the resin bobbin 105 covering the upper and lower ends of the stator 101 is provided with a stator 103 so that the winding 103 directly wound around the teeth 102 of the stator 101 does not fall down on the inner diameter side of the stator 101. An inner diameter wall 106 extends axially from the end. An outer diameter wall 107 extending in the axial direction from the end of the stator 101 may be provided so that the winding 103 wound around the tooth portion 102 of the stator 101 does not collapse toward the outer diameter side of the stator 101.
[0004]
[Problems to be solved by the invention]
As described above, the core 103 of the stator 101 and the winding 103 can be insulated from each other by the slot insulation 109 covering the upper and lower ends of the stator 101 and the inner wall surface of the slot 104. As the amount of winding wound around the tooth 102 of the stator 101 increases, inter-phase contact in the slot 104 of the stator 101, in other words, between the adjacent winding 103 directly wound around the tooth 102 of the stator 101 Can no longer maintain insulation. Further, by winding a large number of windings 103 around the slot 104, the winding 103 often jumps out from the opening of the slot 104 toward the inner diameter side of the stator 101. As a result, the winding 103 protruding from the inner diameter side of the stator 101 during operation of the motor comes into contact with a rotor (not shown) arranged on the inner diameter side of the stator 101, resulting in poor insulation and causing a burnout accident. Also, when the amount of winding in the slot 104 of the stator 101 increases, the insulation distance between the core of the stator tooth end 102a and the winding 103 in the slot 104 cannot be maintained.
[0005]
Moreover, in the electric motor in which the winding 103 is wound directly around the stator teeth 102 as described above, the terminal treatment of the windings 103 of each phase drawn from the stator teeth 102 is rough.
[0006]
[Means for Solving the Problems]
In a motor stator having 2n poles (n is an integer) and 3n stator slots, the slots of the stator are provided with a T-shaped resin insulation having a T-shaped cross section passing through the center of the slot. A wide portion of the resin insulation having a T-shaped cross section faces the opening side, and a narrow portion comes to the bottom side of the slot, so that the winding is applied to the teeth adjacent to the stator. Phase contact can be prevented.
[0007]
A wide portion of the resin insulation having a T-shaped cross section faces the opening side of the slot, and a narrow portion comes to the bottom side of the slot. The winding can be prevented from jumping to the side. In particular, since the wide portion of the resin insulation having a T-shaped cross section faces the slot opening side, insulation between the stator tooth end of the slot opening and the winding can be reliably provided.
[0008]
Further, an upper cover and a lower cover for covering the coil end portion are provided at both ends of the stator, and the upper cover and the lower cover are provided at least at the end faces of the stator at positions corresponding to the windings applied to the teeth. By having the inner diameter wall extending in the direction, the winding can be prevented from falling down to the inner diameter side of the stator. In addition, since the upper cover and lower cover are securely fixed to the stator by resin insulation with a T-shaped cross section after the windings are mounted on the stator teeth, electrical work such as when connecting the windings is performed. The stator of the electric motor can be configured such that the upper cover and the lower cover do not fall off during operation.
[0009]
The upper cover or the lower cover can be easily fixed to the stator by integrally molding either the upper cover or the lower cover and a resin insulation having a T-shaped cross section.
[0010]
The resin insulation having a T-shaped cross section is disposed so as to penetrate the center of the stator slot. However, if the amount of winding directly wound around the stator teeth is large, the winding wound around the adjacent teeth is used. And the resin insulation having a T-shaped cross section cannot be easily fixed to the fixing positions of the upper cover and the lower cover. In such a case, a convex portion is provided from the wide portion of the resin insulation having a T-shaped cross section toward the inner diameter side of the stator, and this convex portion is inserted into a gap of the stator slot opening to form a T-shaped cross section. The resin insulation is not displaced and can be securely fixed to the upper cover or the lower cover.
[0011]
In addition, at least one of the ends in the axial direction of the resin insulation having a T-shaped cross section is formed as a key-shaped engaging part in order to fix the upper cover and the lower cover to the stator. The upper cover and the lower cover can be securely fixed to the stator.
[0012]
In addition, means for facilitating terminal treatment of the winding applied to the teeth is provided in the vicinity of at least one of the ends of the resin insulation having a T-shaped cross section. Can be facilitated.
[0013]
Further, by reducing the tooth width of the stator from the inner diameter to the outer diameter side of the stator, it is possible to mount many windings in the slot.
[0014]
The windings applied to the teeth of the stator can have a larger number of windings installed in the slots by sequentially reducing the winding circumference from the inner diameter side to the outer diameter side of the stator.
[0015]
By using such a stator of a motor for a compressor or a motor mounted on a vehicle, which is a drive source of an air conditioner or a refrigerator, downsizing and high efficiency can be achieved.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a tooth 2 adjacent to a stator 1 of a motor having 2n poles (n is an integer) and 3n stator slots, on a tooth 2 of a stator 1 of the motor having a plurality of magnetic poles. This is a concentrated winding type motor stator in which the winding 3 is wound directly on the motor.
[0017]
For example, the stator 1 of FIG. 1 is a motor stator having four poles and six slots 4 of the stator 1. The slot 4 of the stator 1 shown in FIG. 1 has a bobbin 105 integrally formed with an inner diameter wall 106 and a slot insulator 109 extending in the axial direction from the end of the stator 101 as shown in the conventional example of FIG. Instead, a slot insulation without the inner diameter wall 106 is employed. In this case, as the slot insulation, it is not necessary to wind many windings in the slot, but when strength as the slot insulation is required, it is better to use resin-molded slot insulation, and in the slot, In the case of a low-cost electric motor which needs to be wound with many windings, a film-shaped slot insulation may be used. In FIG. 1 of the present embodiment, the slot insulation 8 is a film-shaped slot insulation in order to improve the motor performance by winding many windings 3 in the slot 4 and to make the motor more inexpensive.
[0018]
As described above, in FIG. 1, since there is no inner diameter wall extending from the end of the stator 1, when the winding 3 is wound directly on the stator teeth 2 by the winding machine, The nozzle 3 draws a large trajectory, and the windings 3 can be surely aligned and wound without winding the windings 3 around the stator teeth 2 separately. By winding in a line, the winding wheel can be wound with a minimum dimension. As a result, copper loss can be reduced and motor performance can be improved. In addition, it is possible to wind more windings 3 by winding in a line.
[0019]
As described above, by increasing the number of windings 3 around the stator 1 of the motor having the number of poles of 2n (n is an integer) and the number of slots 4 of the stator 1 is 3n, high efficiency of the motor can be achieved. Interphase contact between the windings 3 in the slots 4 becomes a problem. Therefore, by using a stator for an electric motor as shown in FIG. 2, interphase contact can be prevented. FIG. 2 is a cross-sectional view of the stator 1 of the electric motor described with reference to FIG.
A resin insulation 10 having a T-shaped cross section is provided so as to penetrate substantially the center of the slot 4 of the stator 1 of the motor. A wide portion C1 (see FIG. 8) of the resin insulation 10 having a T-shaped cross section faces the opening side of the slot 4, and a narrow portion C2 (see FIG. 8) comes at the bottom side of the slot 4. Are arranged as follows. As a result, inter-phase contact between the windings 3 in the slots 4 can be prevented. In the present embodiment, the resin insulation 10 having a T-shaped cross section is handled as a separate component from the upper cover 11 and the lower cover 12. However, the resin insulation 10 is molded integrally with one of the upper cover 11 and the lower cover 12. It may be done. In this case, the man-hour for assembling the resin insulation 10 having a T-shaped cross section to the stator 1 and the upper cover 11 or the lower cover 12 can be reduced.
[0020]
FIG. 3 is a sectional view taken along line BB ′ of the stator 1 described with reference to FIGS. 1 and 2. In this case, the inner diameter walls 6a and 6b are provided so that the winding 3 does not fall in the axial direction on the inner diameter side of the stator 1 from the upper cover 11 and the lower cover 12. As described above with reference to FIG. 11, when the winding 103 is wound around the bobbin 105, the bobbin 105 does not have the inner diameter wall 106 extending in the axial direction from the end face of the stator 101. The winding 3 can be wound around the stator teeth 2 with the minimum track, and can be aligned and wound. After completion of the winding, the windings 3 aligned and wound around the stator teeth 2 by the inner diameter walls 6a and 6b extending from the upper cover 11 and the lower cover 12 to the stator end face are fixed so as not to collapse toward the inner diameter of the stator. The coil end of the winding 3 wound around the child teeth 2 is reliably protected.
[0021]
Further, in addition to the inner diameter wall 6a, a cooling guide wall 13 extending in the axial direction opposite to the end face side of the stator 1 is provided on the upper cover 11 in FIG. The cooling guide wall 13 is provided as a cooling passage in a case in which the winding 3 and the electric motor are incorporated. As a result, the cooling efficiency is improved, and the temperature rise of the electric motor can be prevented.
[0022]
4 and 5 show the upper cover 11 of the present embodiment. FIG. 4 is a view of the upper cover 11 as viewed from above. The upper cover 11 is provided with grooves 11a, which are notched largely and evenly arranged so as to face the number of slots from the outer diameter of the upper cover 11. This notch groove 11a is a notch groove for stopping the resin insulation 10 having a T-shaped cross section described later. The notch groove 11b, which is slightly shallower than the largely cut groove 11a, is a notch groove for drawing out the end of the winding 3 attached to the tooth portion 2. An air hole 11c is provided on the entire circumference of the upper cover 11, and is a through hole for cooling the winding 3. FIG. 5 is a cross-sectional view of the upper cover 11 shown in FIG. The cylinder extending in the axial direction of the upper half shown in FIG. 5 is the cooling guide wall 13 as described above, and the inner diameter wall 6a extending in the lower half prevents the winding 3 from collapsing toward the inner diameter side. is there.
[0023]
6 and 7 show the lower cover 12 of the present embodiment. FIG. 6 is a view of the lower cover 12 as viewed from above. Similar to FIG. 4, the lower cover 12 is provided with grooves 12 a which are notched and are notched so as to face the number of slots from the outer diameter of the lower cover 12. The notch groove 12a is a notch groove for stopping the resin insulation 10 having a T-shaped cross section described later. A round hole 12 c is provided around the entire circumference of the lower cover 12, and is a through hole for cooling the winding 3. FIG. 7 is a cross-sectional view taken along the line EE ′ of the lower cover 12 shown in FIG. The inner diameter wall 6b extending to the lower half shown in FIG. 7 prevents the winding 3 from collapsing toward the inner diameter side.
[0024]
FIG. 8 shows a resin insulation 10 having a T-shaped cross section. The resin insulation 10 having a T-shaped cross section fixes an upper cover 11 and a lower cover 12 so as to sandwich the stator 1. The resin insulation 10 having a T-shaped cross section is arranged such that the wide portion C1 of the resin insulation 10 having a T-shaped cross section faces the opening side of the slot 4 and the narrow portion C2 comes to the bottom side of the slot. I have. As a result, interphase contact between the windings can be prevented, and the winding 3 can be prevented from protruding from the slot opening 15 to the inner diameter of the stator. Furthermore, since the wide portion C1 of the resin insulation 10 having a T-shaped cross section faces the slot opening 15, the insulation distance between the tooth end 2a of the stator 1 and the winding 3 can be ensured. it can.
[0025]
FIG. 9 is a layout diagram showing a state in which the resin insulation 10 having a T-shaped cross section shown in FIG. The hatched portion shows the inside of the slot 4 of the winding 3 wound directly around the stator teeth 2. The slot insulation 8a covering the wall surface in the slot 4 is insulated with a thin material such as a film, so that the cost can be reduced as compared with the resin-molded slot insulation, and more windings 3 can be wound.
[0026]
As can be seen from FIG. 9, the resin insulation 10 having a T-shaped cross section is arranged so as to penetrate the center of the slot of the stator 1, but is directly wound around the teeth 2 of the adjacent stator 1. Since it is inserted between the windings 3, it is pushed by the windings 3 and fitted into grooves 11 a and 12 a which are notched greatly in the resin insulation 10, the upper cover 11 and the lower cover 12 having a T-shaped cross section, and are aligned. Difficult to fix. Therefore, a convex portion 14 is provided from the wide portion C1 of the stator 1 toward the inner diameter side of the stator 1, and the convex portion 14 is inserted into the slot of the slot opening 15 of the stator 1 as a guide groove, so that the cross section becomes T-shaped. The resin insulation 10 having a shape can be easily fixed to the largely cut grooves 11a and 12a of the upper cover 11 or the lower cover 12 without any slip.
[0027]
As a method of fixing the upper cover 11 and the lower cover 12 to the stator 1, a key-shaped engaging stopper 16 is provided at at least one end in the axial direction of the resin insulation 10 having a T-shaped cross section. , Can be easily engaged with the notched grooves 11a and 12a which are largely cut out of the upper cover 11 and the lower cover 12, and can be fixed so as to sandwich the stator 1. Further, the resin insulation 10 having a T-shaped cross section is used for terminating the end of the winding 3 drawn out from the tooth portion 2 of the electric motor, and the resin insulation 10 having a T-shaped cross section is used for at least one end. By providing the groove 17 in the vicinity of the portion, the terminal portion of the winding 3 drawn out can be inserted into the groove 17 and the winding 3 drawn out from each phase can be routed without contact. It is possible to eliminate the contact between the phases at the terminal portion of the winding 3 due to the rough routing of the end portion. In the present embodiment, the concave groove 17 is provided in the vicinity of at least one of the ends of the resin insulation 10 having a T-shaped cross section. However, any structure may be used as long as the terminal portion of the winding 3 can be fixed. , A pin or the like may be provided and the winding end may be wound, and the shape is not specified.
[0028]
FIG. 10 shows a partially enlarged view of the tooth portion 2 of the stator 1. In FIG. 10, windings and insulation are removed for convenience. By reducing the width of the iron core portion of the tooth portion 2 of the stator 1 from the tooth portion W1 on the inner diameter side to the outer diameter side W2 of the stator 1, the winding 3 can be mounted deep inside the slot 4. A number of windings 3 can be wound in accordance with the miniaturization and high efficiency. The winding procedure of the winding machine is as follows. As the first step, winding is started from the slot depth (outer diameter side W2 side) so that the slot depth is substantially the same as the tooth height W1 on the stator inner diameter side. Next, as a second step, the nozzle of the winding machine moves back and forth between the teeth W1 on the inner diameter side of the stator 1 and the teeth W2 on the outer diameter of the stator, and the winding 3 is aligned and wound.
[0029]
With such a winding method, the winding circumference of the winding 3 applied to the tooth portion 2 of the stator 1 can be sequentially reduced from the inner diameter side to the outer diameter side of the stator 1. Of the winding 3 on the inner diameter side of the coil can be minimized. Further, since the winding 3 can be wound deeply into the slot 4, the number of windings of the winding 3 increases, and the winding wheel of the winding 3 can be made the minimum size, so that the efficiency of the electric motor can be improved. it can.
[0030]
As described above, the stator of the concentrated winding type motor in which the winding is wound directly on the teeth of the stator is used for the stator of the motor in the compressor, which is the driving source of an air conditioner or a refrigerator, or the motor mounted on a vehicle. There is no interphase contact in the slot, and the stator of the motor can be made so that the winding does not jump out of the slot opening.Also, the insulation distance between the winding and the iron core at the end of the stator teeth is secured. It is possible to provide a motor stator with less insulation failure.
[0031]
Further, the circumferential length of the winding wheel can be reduced to a minimum size, and copper loss can be reduced. As a result, the number of turns of the winding can be increased, and the efficiency of the electric motor can be improved. Therefore, when used as a stator of an electric motor in a compressor, which is a driving source of an air conditioner or a refrigerator, or an electric motor mounted on a vehicle, a very efficient electric motor stator can be obtained.
[0032]
In addition, instead of the concentrated winding method in which the winding is wound directly on the teeth of the stator, an inserter method in which a winding wheel is wound by an external winding machine and the winding is machined into one tooth is achieved. be able to. In this case, there is no need to provide a gap for the winding nozzle of the winding machine that winds the winding directly on the teeth compared to the case of the concentrated winding method. Although the efficiency of the electric motor can be further improved, contact between adjacent windings frequently occurs. Therefore, according to the embodiment of the present invention, inter-phase contact between adjacent windings can be reliably prevented, and a stator of a motor having a high space factor (the amount of windings occupying slots) can be obtained. As a result, it is possible to provide a motor stator having good quality and high efficiency.
[0033]
【The invention's effect】
A stator of a motor according to the present invention is a motor stator having a pole number of 2n (n is an integer) and a stator slot number of 3n, wherein the stator slot has a T-shaped cross section penetrating the slot center. Resin insulation is provided, and a wide portion of the resin insulation having a T-shaped cross section faces the opening side of the slot, and a narrow portion comes to the bottom side of the slot, so that adjacent portions of the stator are adjacent to each other. Between the windings applied to the tooth portions can be prevented.
[0034]
In addition, the wide portion of the resin insulation having a T-shaped cross section faces the opening side of the slot, and the narrow portion comes to the bottom side of the slot. The winding can be prevented from jumping out. In particular, since the wide portion of the resin insulation having a T-shaped cross section faces the slot opening side, insulation between the stator tooth end of the slot opening and the winding can be reliably provided.
[0035]
Further, the upper cover and the lower cover that cover the coil end portions at both ends of the stator are provided at least from the upper cover and the lower cover at positions corresponding to the coil end portions of the winding wound directly on the teeth. By having the inner diameter wall extended on the end face, it is possible to prevent the winding from falling down to the inner diameter side of the stator. Also, after attaching the winding to the stator teeth, the upper cover and lower cover can be securely fixed to the stator by resin insulation with a T-shaped cross section. Sometimes, the upper cover and the lower cover do not fall off.
[0036]
In addition, either one of the upper cover and the lower cover is molded integrally with resin insulation with a T-shaped cross section, so that it can be easily fitted into the large cutout groove provided in the upper cover or the lower cover and aligned. And can be fixed. In this case, it goes without saying that when integrally molded with the upper cover or the lower cover, the groove 11a or 12a which is largely cut off on the integrally molded side becomes unnecessary.
[0037]
In addition, the resin insulation having a T-shaped cross section is arranged so as to pass through the center of the stator slot, but the amount of winding wound around the stator teeth is pushed by the winding and the upper cover and the lower cover are pressed. Even if it is not possible to securely align and fix the T-shaped resin insulation at the fixed position, the protrusion protrudes from the wide portion of the T-shaped resin insulation toward the stator inner diameter side, By inserting the projection into the gap between the stator slot openings, the upper cover or the lower cover can be fitted and fixed without the gap between the fixing position and the resin insulation having a T-shaped cross section.
[0038]
In addition, both ends in the axial direction of the resin insulation having a T-shaped cross section are securely locked by fixing the upper cover and the lower cover to the stator by fixing the upper cover and the lower cover to a stator. Can be fixed to the child.
[0039]
In addition, means for facilitating terminal treatment of the winding applied to the teeth is provided in the vicinity of at least one of the ends of the resin insulation having a T-shaped cross section. Can be facilitated.
[0040]
Further, by reducing the tooth width of the stator from the inner diameter to the outer diameter side of the stator, it is possible to mount many windings in the slot.
[0041]
The windings applied to the teeth of the stator, by sequentially reducing the winding circumference from the inner diameter side of the stator toward the outer diameter side, to prevent collapse into the inner diameter side of the stator, and, Copper loss can be reduced and the efficiency of the motor can be improved.
[0042]
By using such a motor stator for a compressor as a drive source of an air conditioner or a refrigerator, or a motor mounted on a vehicle, it is possible to obtain a stator having good quality, miniaturization and high efficiency. .
[Brief description of the drawings]
FIG. 1 is a diagram of a stator showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view in FIG.
FIG. 3 is a sectional view taken along the line BB ′ in FIG. 1;
FIG. 4 is a diagram of an upper cover that covers a coil end portion.
FIG. 5 is a sectional view taken along the line DD ′ in FIG. 4;
FIG. 6 is a diagram of a lower cover that covers a coil end portion.
FIG. 7 is a sectional view taken along the line EE ′ in FIG. 6;
FIG. 8 shows a T-shaped resin insulation section.
FIG. 9 shows a state in which resin insulation having a T-shaped cross section is attached to a slot of a stator.
FIG. 10 is a partially enlarged view of a stator tooth portion in the present embodiment.
FIG. 11
It is a figure of a stator showing a conventional example.
[Explanation of symbols]
1, 101: Stator, 2, 102: Tooth, 2a, 102a: Stator tooth end, 3, 103: Winding, 4, 104: Slot, 6a, 6b , 106: inner wall, 8, 8a, 109: slot insulation, 10: T-shaped resin insulation, 11: upper cover, 11a, 11b, 12a: cutout groove , 11c, 12c ... air hole, 12 ... lower cover, 13 ... refrigerant guide, 14 ... convex part, 15 ... slot opening, 16 ... key-shaped locking, 17 ... concave groove, 105 ... bobbin, 107 ... outer diameter wall.

Claims (9)

In a stator of an electric motor having 2n poles (n is an integer) and 3n stator slots, the slots of the stator are provided with T-shaped resin insulation having a T-shaped cross section passing through the center of the slot. A stator of the electric motor arranged such that a wide portion of the resin insulation having a T-shaped cross section faces the opening side and a narrow portion comes to the bottom side of the slot,
An upper cover and a lower cover covering a coil end portion are provided at both ends of the stator, and the upper cover and the lower cover extend at least in a stator axial direction at positions corresponding to windings applied to the teeth. A stator for an electric motor having an inner diameter wall, wherein the upper cover and the lower cover are fixed so as to sandwich the stator by resin insulation having a T-shaped cross section. One of the upper cover and the lower cover is integrally formed with a resin insulation having a T-shaped cross section, and the resin insulation having a T-shaped cross section extends so as to pass through the center of the stator slot to sandwich the stator. The stator for an electric motor according to claim 1, wherein the stator is fixed as described above. The convex portion protrudes from the wide portion of the T-shaped resin insulation toward the inner diameter side of the stator, and the convex portion is inserted into a gap of a stator slot opening. The stator of an electric motor according to claim 2 or 3. At least one end in the axial direction of the resin insulation having a T-shaped cross section has a key-shaped locking member for fixing the upper cover and the lower cover to a stator. The motor stator according to any one of claims 1 to 3, wherein: 2. A means for facilitating terminal treatment of a winding applied to a tooth portion is provided at at least one end of the resin insulation having a T-shaped cross section. The stator for an electric motor according to any one of claims 1 to 4. The stator of an electric motor according to any one of claims 1 to 5, wherein a tooth width of the stator decreases from an inner diameter of the stator toward an outer diameter side. 7. The winding provided on the teeth of the stator has a winding circumference that decreases in order from the inner diameter side to the outer diameter side of the stator. A stator for an electric motor according to any of the claims. The stator for an electric motor according to any one of claims 1 to 7, wherein the stator is used for a compressor that is a driving source of an air conditioner, a refrigerator, or the like. The stator for an electric motor according to any one of claims 1 to 7, wherein the stator is used for a motor mounted on a vehicle.

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