JP4457612B2 - Compressor, electric motor and its stator - Google Patents

Description

  The present invention relates to the structure and manufacturing technology of an electric motor.

  The electric motor includes a conducting wire (hereinafter referred to as “winding”) wound around a winding housing portion opened in the stator core. When the stator core is annular, the winding housing part opens to the inner peripheral side.

  As a method for winding the winding, there is a so-called direct winding method in which a winding nozzle or the like is used to supply the winding from the opening side to the winding storage portion and wind it while applying a predetermined tension. This winding method is employed in the technique described in Patent Document 1, for example.

  On the other hand, there is also a so-called inserter winding method in which a winding is wound around a winding frame prepared in advance for direct winding, and the winding is inserted into a winding storage portion in a wound state. Such a winding method is employed in the technique described in Patent Document 2, for example.

  In order to improve the winding space factor, Patent Document 3 discloses a technique in which the bottom shape of the winding housing portion includes a line orthogonal to the salient pole, and the width of the tooth portion becomes narrower from the outer periphery toward the inner periphery. Techniques are disclosed in Patent Document 4, respectively.

  In the inserter method, since the winding is wound without applying tension between the winding and the stator, the strength of winding of the winding (hereinafter referred to as “winding strength”) cannot be increased. This makes it difficult to reduce vibration due to relative movement between the stator and the winding. Furthermore, considering that the stator is generally composed of laminated iron cores, it is impossible to increase the bonding strength between the laminated iron cores. This also causes a problem that the laminated iron core vibrates depending on the frequency of driving the electric motor.

  In the direct winding, the winding strength can be increased as compared with the inserter method. However, since the winding is wound directly around the winding housing, the winding space factor and the winding strength are greatly affected by the shape of the winding housing. Since the winding storage portion is surrounded by the tooth portion and the yoke portion, it can be said that the winding space factor and the winding strength are greatly affected by the shape of the tooth portion and the yoke portion.

  FIG. 13 is a cross-sectional view for explaining such a situation, and shows a cross section perpendicular to the central axis of the annular core 200 of the stator. The center axis direction of the stator is adopted as the Z coordinate of the cylindrical coordinate system, and the R coordinate in the radial direction and the Θ coordinate in the circumferential direction perpendicular thereto are adopted.

  The annular core 200 includes a plurality of magnetic layers stacked in the Z direction. Each of the magnetic layers integrally includes six tooth portions 21 extending in the radial direction R when viewed from the Z-axis direction and a connecting portion 22 that connects the tooth portions 21 in an annular shape. A pair of adjacent tooth portions 21 and a connecting portion 22 that connects them form a winding storage portion 20 in which the windings are stored. That is, the side wall 20 b of the winding housing part 20 is the side wall of the tooth part 21, and the outer peripheral surface 20 c is the inner peripheral surface of the connecting part 22.

  A recess 23 that opens toward the outer peripheral side is formed at a position facing the tooth portion 21 in the connecting portion 22. The recess 23 functions as a path through which the lubricating oil passes.

  Convex portions 21 a extending along the circumferential direction Θ are provided on both sides of the tooth portion 21 at the inner peripheral end of the tooth portion 21, and the winding storage portion 20 is disposed on the inner peripheral side thereof. The winding nozzle insertion port 20a is formed by two of the convex portions 21a belonging to the adjacent tooth portions 21 with the portion 20 interposed therebetween.

  FIG. 14 is a plan view showing a state in which the winding is wound by direct winding in the vicinity of one of the tooth portions 21. The tooth portion 21 is provided with a winding frame 30 at the end in the Z-axis direction. The winding frame 30 has a U-shape and opens in the Z-axis direction. The winding 50 is wound around the winding frame 30 and the tooth portion 11A.

  In the direct winding, the winding 52 is wound by alternately inserting the winding nozzle 40 into the winding nozzle insertion port 20a of the winding storage portion 20 on both sides of the tooth portion 21 to be wound. The winding 52 is supplied from the tip of the winding nozzle 40. Here, in order to distinguish between the winding before being wound around the tooth portion 21 and the winding after being wound, reference numerals 52 and 51 are employed for the former and the latter, respectively. However, in the case where both are not particularly distinguished, the reference numeral 50 is assigned to both.

  The winding nozzle 40 is inserted from the winding nozzle insertion port 20a of the winding storage unit 20 on the left side in the drawing, and winding starts from a position 40a on the inner peripheral side of the winding storage unit 20. When the annular core 200 and the winding nozzle 40 move relatively along the Z-axis direction, the winding 51 is wound around the left side of the tooth portion 21 in the drawing while giving a predetermined tension. Removes the winding housing 20 on the left side in the Z-axis direction.

  Thereafter, the annular core 200 and the winding nozzle 40 perform relative movement MΘ along the circumferential direction Θ, so that the winding nozzle 40 winds the winding 51 while applying a predetermined tension to the winding frame 30. , And inserted into the winding nozzle insertion port 20a of the right-hand winding storage unit 20.

  Further, the annular core 200 and the winding nozzle 40 are relatively moved along the Z-axis direction, so that the winding 51 is wound while applying a predetermined tension to the right side of the tooth portion 21 in the drawing. 40 removes the winding housing 20 on the right side in the Z-axis direction.

  In this manner, the winding nozzle 40 winds the winding 51 around the tooth portion 21 by alternately repeating the relative movement MΘ in the Z-axis direction and the circumferential direction Θ with respect to the annular core 200. In addition, since the relative movement MR in the radial direction R is also involved, the winding 51 is wound around the tooth portion 21 from the inner peripheral side to the outer peripheral side.

JP 2000-358346 A JP 2001-346366 A JP 2000-358346 A JP 2002-369418 A

  However, even if the winding nozzle 40 reaches the positions of the outermost circumferences 40 c and 40 d of the winding storage part 20, the winding 51 cannot be sufficiently wound up to the outermost circumference side of the tooth part 21. As described above, the winding is mainly performed by alternately repeating the relative movement in the Z-axis direction and the circumferential direction Θ. Therefore, it is possible to obtain sufficient winding strength by applying a predetermined tension in the region A. It was limited in scope. The innermost circumference of the region A is the innermost circumference at a position where the winding frame 30 can be wound. Further, the outermost periphery is a position where the winding 51 is wound around the tooth portion 21 when the winding nozzle 40 reaches the positions 40c and 40d of the outermost periphery of the winding storage portion 20. In consideration of the fact that the tip of the winding nozzle 40 and the size of the winding 50 are small, the position of the outermost circumference is lowered from the position of the outermost circumference in the radial direction R of the winding storage portion 20 to the tooth portion 21. It can be seen as a perpendicular foot.

  And such a lack of winding strength on the outer peripheral side of the tooth portion 21 impairs the suppression of deformation due to the relative movement between the stator and the winding and the improvement of the fixing strength between the laminated cores. become.

  In addition, the winding space factor in the winding storage portion 20 on the outer peripheral side of the region A is inferior to that of the region A. FIG. 15 is a perspective view showing a partially broken configuration near the tooth portion 21. In order to clarify how the winding 51 is wound, the winding 51 is removed from the winding frame 30 to the winding storage portion 20.

  Since a predetermined tension is not applied to the outer peripheral side of the winding frame 30 or the winding storage portion 20, the winding 51 is wound so as to spill from the outermost periphery of the region A to the inner peripheral side. Therefore, not only the gradient in which the number of winding layers decreases from the inner peripheral side toward the outer peripheral side, but also the number of winding layers from the outer peripheral side toward the inner peripheral side, with the vicinity of the outermost periphery in the region A as a boundary. There is also a gradient that decreases. The latter gradient further promotes the tendency of the winding 51 to be wound toward the inner periphery. As a result, a gap 53 in which the winding 51 does not exist is formed on the outer peripheral side of the winding storage portion 20. It is obvious that the presence of such a gap 53 causes a deterioration of the winding space factor.

  The present invention has been made in view of the above circumstances, and aims to increase the winding space factor and increase the winding strength.

A first stator according to the present invention is used in an electric motor, and is wound in a direct winding around a plurality of magnetic layers (100A) stacked in a central axis direction (Z) and the plurality of magnetic layers. Winding (51). Each of the magnetic layers integrally includes a plurality of tooth portions (11A) extending in the radial direction (R11) when viewed from the central axis and a connecting portion (12A) for connecting the tooth portions in an annular shape. The tooth portion includes a pair of first surfaces (10b) parallel to the extending direction (R11) of the tooth portion when viewed from the central axis direction, and 90 with respect to the extending direction when viewed from the central axis direction. And a pair of second surfaces (10d) in contact with the first surface at angles (θ1, θ2) larger than degrees. A pair of adjacent tooth portions forms a winding storage portion (10A) in which the winding is stored, and a pair of adjacent winding storage portions sandwich one tooth portion. A leg of a perpendicular line (10) from the outermost circumferential position (10c) in the radial direction (R101, R102) of the winding housing portion in the extending direction (R11) of the tooth portion sandwiched by the winding housing portion ( S) coincides with the foot (G) of the perpendicular line dropped in the extending direction from the position (B) where the first surface and the second surface of the tooth portion are in contact with each other or on the outer peripheral side. And the angle which the said 2nd surface (10d) and the said extending direction (R11) comprise increases as it goes to the said outer peripheral side.

  In a desirable first aspect, an angle formed by the second surface (10d) and the extending direction (R11) is less than 180 degrees.

In a desirable second aspect, an insulating member (60) having a fine groove for individually storing the winding is provided on the second surface.

  An electric motor having the first stator and the second stator according to the present invention and a compressor including the electric motor are also within the scope of the present invention.

According to the 1st stator concerning this invention, it becomes easy to wind a coil | winding to the outer peripheral side, and a coil | winding space factor and winding strength increase. And it becomes easy to wind a coil | winding to the outer peripheral side, and a coil | winding space factor can be raised.

  If the desirable first aspect is adopted, the effect of the second surface can be achieved.

If the desirable second mode is adopted, the windings are wound in an aligned manner.

First embodiment.
FIG. 1 is a cross-sectional view showing a configuration of an annular core 100A employed in the stator according to the first embodiment of the present invention, and shows a cross section perpendicular to the central axis of the annular core 100A. The center axis direction of the stator is adopted as the Z coordinate of the cylindrical coordinate system, and the R coordinate in the radial direction and the Θ coordinate in the circumferential direction perpendicular thereto are adopted.

  The annular core 100A has a plurality of magnetic layers stacked in the Z-axis direction, and a winding is wound around the plurality of magnetic layers in a direct winding manner.

  Each of the plurality of magnetic layers integrally includes a plurality of, for example, nine tooth portions 11A extending in the radial direction R when viewed from the central axis, and a connecting portion 12A that connects these tooth portions 11A in an annular shape. Have. A pair of adjacent tooth portions 11A form a winding storage portion 10A in which a winding is stored. A pair of adjacent winding storage portions 10A sandwich one tooth portion 11A.

  FIG. 2 is a cross-sectional view illustrating a configuration of a rotor 300A used by being inserted with a small gap from the annular core 100A shown in FIG. The rotor 300A is a permanent magnet embedded type, and six permanent magnets 301A are arranged. It is desirable to employ the permanent magnet embedded rotor 300A from the viewpoint of increasing efficiency.

  FIG. 3 is an enlarged plan view showing the vicinity of the tooth portion 11A. The tooth frame 11A is provided with a winding frame 30 at the end in the Z-axis direction. The winding frame 30 has a U-shape and opens in the Z-axis direction. The winding is wound around the winding frame 30 and the tooth portion 11A.

  The tooth portion 11A has a pair of first surfaces 10b, a pair of second surfaces 10d, and a convex portion 11a. The first surface 10b is parallel to the extending direction of the tooth portion 11A (that is, the radial direction R11) when viewed from the Z-axis direction. When viewed from the Z-axis direction, the second surface 10d forms angles θ1 and θ2 that are more than 90 degrees and less than 180 degrees with respect to the extending direction. The first surface 10b and the second surface 10d are side walls of the tooth portion 11A and are also side walls of the winding storage portion 10A. 10 A of winding storage parts also have the outer peripheral wall 10c as a position of the outermost periphery about the radial direction R, but this is also an inner peripheral wall of 12 A of connection parts.

  The convex portion 11a is provided at the inner peripheral end of the tooth portion 11A so as to extend on both sides of the tooth portion 11A along the circumferential direction Θ. A winding nozzle insertion port 10a is formed on the inner circumferential side of the winding storage portion 10A by two convex portions 11a belonging to the tooth portion 11A adjacent to the winding storage portion 10A.

  The perpendicular foot S of the winding housing portion 10A descending in the extending direction R11 of the tooth portion 11A sandwiched by the winding housing portion 10A from the outermost peripheral position in the radial direction R101, R102, that is, the center of the outer peripheral wall 10c is: In addition, it coincides with the foot G of the perpendicular line extending in the extending direction R11 from the position B where the first surface 10b and the second surface 10d of the tooth portion 11A are in contact with each other or on the outer peripheral side. Therefore, even if the tip of the winding nozzle 40 reaches the outer peripheral wall 10c (positions 40c and 40d), at least the first surface 10b is wound around the tooth portion 11A with a predetermined tension using direct winding. Can turn. When viewed from the Z-axis direction, the outer peripheral wall 10c may form an angle smaller than 90 degrees with respect to the extending direction R11 of the tooth portion 11A. In FIG. 3, when viewed from the Z-axis direction, the winding storage portion 10A has a linear shape perpendicular to the radial directions R101 and R102.

  FIG. 4 is a perspective view showing a part of a configuration near a tooth portion 11A with a part thereof broken. In order to clarify the winding method of the winding 51, the winding 51 in the position from the winding frame 30 to the winding storage portion 10A is removed. However, numbers 1 to 5 are added to the cross section of the winding 51, and these numbers indicate the number of layers of the winding 51 from the side closer to the tooth portion 11A in the winding storage portion 10A. .

  On the outer peripheral side of the winding frame 30 and the winding housing portion 10A, as shown in FIG. 4, in the winding frame 30, a part of the high-layer winding 51 in the winding housing portion 10A is not in the winding frame 30. Located in the lower level. For example, in the first layer counted from the bottom 30b of the winding frame 30, the windings 51 in the second layer and the fourth layer are located in the winding storage portion 10A.

  Thus, due to the inclination of the second surface 10d that is inclined with respect to the extending direction of the tooth portion 11A, in the vicinity of the outermost periphery of the wiring region A, the winding is performed from the inner peripheral side toward the outer peripheral side. There is a gradient in which the number of layers decreases, and there is no gradient in which the number of winding layers decreases from the outer peripheral side to the inner peripheral side as in the prior art. Therefore, the winding spills out to the outer peripheral side of the winding storage portion 10A, and the winding space factor can be improved.

  In particular, when winding the winding around the tooth portion 11A, the winding is first wound around the first surface 10b. And since the position B which becomes the outer peripheral side edge part of the 1st surface 10b exists in the inside of the area | region A, the coil | winding wound around the 1st surface 10b has the high winding strength, and is wound firmly. Accordingly, the windings can be firmly adhered together with the plurality of magnetic layers that are stacked to form the stator 100, and the rigidity of the stator can be increased. This is effective in suppressing the vibration of the laminated iron core.

  Further, since the angles θ1 and θ2 are larger than 90 degrees, the winding wound around the second surface 10d is also wound around the tooth portion 11A while receiving a predetermined tension with the tooth portion 11A. Therefore, it contributes to increasing the rigidity of the stator.

  The angles θ1 and θ2 need only be larger than 90 degrees. However, if the angles θ1 and θ2 are increased to 180 degrees, the first surface 10b and the second surface 10d are not substantially distinguished from each other, and the operation of the second surface 10d can be effectively performed. Therefore, θ1 and θ2 are preferably less than 180 degrees.

  Further, the second surface 10d is illustrated as being linear when viewed from the Z-axis direction, but may be curved as long as the angles θ1 and θ2 are greater than 90 degrees and less than 180 degrees. For example, as the distance from the first surface 10b increases, the angle formed between the tangent line and the extending direction R11 of the tooth portion 11A when viewed from the Z-axis direction may increase. If this angle increases as the distance from the first surface 10b increases, the winding increases in the winding frame 30 at the initial stage of winding, and more windings are supplied to the outer peripheral side in the later stage of winding. The Therefore, it becomes easy to wind a coil | winding to the outer peripheral side, and a coil | winding space factor can be raised.

  Conversely, a shape that decreases as the angle moves away from the first surface 10b, for example, a shape that exhibits a concave arc toward the winding housing portion 10A when viewed from the Z-axis direction is employed as the second surface 10d. That is not desirable. This is because in the winding frame 30, many windings are supplied to the outer periphery side at the initial stage of winding, so that it is difficult to increase the gradient and the degree of improvement in the winding space factor is small. Therefore, the angle formed by the second surface 10d and the extending direction R11 is preferably non-decreasing toward the outer peripheral side.

  When the permanent magnet embedded rotor 300A as shown in FIG. 2 is adopted, a strong attractive force and repulsive force are generated between the rotor 300A and the stator, and a large force is applied to the inner diameter portion of the stator. Works. This is a force that vibrates the stator in an annular shape. However, according to the present invention, the winding strength is high, and annular vibration is suppressed. Therefore, even if a highly efficient embedded permanent magnet rotor is employed, the generation of sound can be reduced.

  Further, since the magnetic flux Φ passes through not only the connecting portion 12A but also the tooth portion 11A as shown by the white arrow in FIG. 3, it is easy to enlarge the recess 13 provided on the outer periphery of the connecting portion 12A. In other words, if the area of the recess 13 viewed from the Z-axis direction is not changed from the conventional one, the cross-sectional area of the winding housing portion 10A can be made larger than the conventional one and the number of windings can be increased.

  The shape of the recess 13 is preferably such that the outer periphery 13a of the connecting portion 12A that forms the recess 13 is substantially parallel to the second surface 10d. This is because the width through which the magnetic flux Φ passes is not limited.

  FIG. 5 is a cross-sectional view showing an example of a desirable modification of the present embodiment, and shows one vicinity of the winding housing portion 10A. The winding housing portion 10A is provided with an insulating member 60 around it, specifically, on the first surface 10b and the second surface 10d. In FIG. 5, the case where the insulating member 60 is provided also on the outer peripheral wall 10c and the surface of the convex portion 11a on the winding storage portion 10A side is illustrated.

  The insulating member 60 is desirably more elastic than the annular core 100A. The structure shown in FIG. 5 can be obtained by forming the insulating member 60 in advance and then inserting it into the winding housing 10A. Alternatively, an insulator may be molded on the annular core 100A. Alternatively, an elastic insulating film may be deformed and inserted along the winding storage portion 10A.

  FIG. 6 is a cross-sectional view showing a more desirable mode, in which the vicinity of the insulating member 60 in FIG. 5 is enlarged. The insulating member 60 has a groove that opens toward the winding housing portion 10A. Here, the insulating member 60 may have a V-shaped groove formed by surfaces 61 and 62 that are non-parallel to the second surface 10d. Illustrated. The V-shaped groove may be replaced with a U-shaped groove.

  Of the windings 51 wound around the tooth portion 11A, the windings initially wound are individually stored along the V-shaped groove in the winding storage portion 10A. The winding 51 is wound with a tension indicated by a force F applied toward the tooth portion 11A. Since the coil | winding 51 is contacting the surfaces 61 and 62, it is pressed by component force f1, f2 with respect to each surface. The component force f1 contributes to the improvement of the winding strength. Further, the surface 62 prevents the winding 51 from sliding toward the inner peripheral side against the component force f2. By providing the fine surfaces 61 and 62 in this way, the winding 51 can be aligned and wound.

  Although FIG. 6 illustrates a structure in which the second surface 10d is finely flat, the second surface 10d may have a microscopically inclined surface similar to the surfaces 61 and 62. In that case, it is necessary that not the inclined surfaces themselves but the direction in which they are arranged satisfy the above-described conditions for the angles θ1 and θ2. On the contrary, the angle of the microscopic inclined surface does not need to satisfy the conditions for the above-described angles θ1 and θ2.

  If the second surface 10d has the above-described inclined surface finely, even if the insulating member 60 is formed by molding, it is easy to form the surfaces 61 and 62 reflecting the shape of the inclined surface. .

  In the present embodiment, the case where the number of stator pole teeth is 9 (see FIG. 1) and the number of magnetic poles is 6 (see FIG. 2) is exemplified. However, the larger the number of poles, the more effectively the area of the winding housing portion 10A is secured. Cheap. In other words, the outer peripheral wall 10c is preferably as narrow as possible. It is also desirable that the outer peripheral wall 10c is omitted and the two second surfaces 10d belonging to different tooth portions 11A contact each other in the same winding housing portion 10A.

Second embodiment.
FIG. 7 is a cross-sectional view showing a configuration of an annular core 100B employed in the stator according to the second embodiment of the present invention, and shows a cross section perpendicular to the central axis of the annular core 100B. The center axis direction of the stator is adopted as the Z coordinate of the cylindrical coordinate system, and the R coordinate in the radial direction and the Θ coordinate in the circumferential direction perpendicular thereto are adopted.

  Similarly to the annular core 100A, the annular core 100B has a plurality of magnetic layers stacked in the Z-axis direction, and windings are wound around the plurality of magnetic layers in a direct winding.

  Each of the plurality of magnetic layers integrally includes a plurality of, for example, six tooth portions 11B extending in the radial direction R when viewed from the central axis, and a connecting portion 12B that connects these tooth portions 11B in an annular shape. Have. A pair of adjacent tooth portions 11B form a winding storage portion 10B in which a winding is stored. A pair of adjacent winding storage portions 10B sandwich one tooth portion 11B.

  FIG. 8 is a cross-sectional view illustrating the configuration of a rotor 300B used by being inserted with a small gap from the annular core 100B shown in FIG. The rotor 300B is a permanent magnet embedded type, and four permanent magnets 301B are arranged. Employing the permanent magnet embedded rotor 300B is desirable from the viewpoint of increasing efficiency.

  FIG. 9 is an enlarged plan view showing the vicinity of the tooth portion 11B. The tooth part 11B is provided with a winding frame 30 at the end in the Z-axis direction. The winding frame 30 has a U-shape and opens in the Z-axis direction. The winding is wound around the winding frame 30 and the tooth portion 11B.

  The tooth portion 11B includes a pair of the first surface 10b, a pair of the second surface 10e, a pair of the third surface 10f, and a convex portion 11a. As described in the first embodiment, the first surface 10b is parallel to the extending direction (that is, the radial direction R11) when viewed from the Z-axis direction. The second surface 10e and the third surface 10f adjacent thereto form a convex portion 14. The convex portion 14 protrudes toward the winding housing portion 10B. For example, the second surface 10e is vertically adjacent to the first surface 10b. For example, the third surface 10f is parallel to the first surface 10b and is adjacent to the second surface 10e. Similarly to the second surface 10d of the first embodiment, the second surface 10e may be inclined at an angle exceeding 90 degrees with respect to the radial direction R11.

  The first surface 10b, the second surface 10e, and the third surface 10f are side walls of the tooth portion 11B and also are side walls of the winding housing portion 10B. The winding storage portion 10B also has an outer peripheral wall 10c as the outermost peripheral position in the radial direction R, which is also the inner peripheral wall of the connecting portion 12B. The outer peripheral wall 10c exhibits, for example, an arc when viewed from the Z-axis direction.

  The convex portion 11a is provided on the inner peripheral side of the tooth portion 11B so as to extend on both sides of the tooth portion 11B along the circumferential direction Θ. A winding nozzle insertion port 10a is formed on the inner peripheral side of the winding storage portion 10B by two projections 11a belonging to the tooth portion 11B sandwiching the winding storage portion 10B. For example, the tip of the convex portion 11a is located on the extension of the third surface 10f when viewed from the Z-axis direction. Alternatively, as indicated by a dotted line in FIG. 9, the line connecting the position where the second surface 10e and the third surface 10f are in contact with the convex portion 11a may not be located on the extension of the third surface 10f.

  FIG.10 and FIG.11 is a perspective view which partially fractures | ruptures and shows the structure of the vicinity of a certain tooth | gear part 11B. In order to clarify the winding method of the winding 51, the winding 51 in the position from the winding frame 30 to the winding storage portion 10B is removed. FIG. 10 shows a state in the middle of winding in a state where the winding 51 is wound in the concave portion 10P (see FIG. 9) formed by the first surface 10b, the second surface 10e, and the convex portion 11a. FIG. 11 shows a state where the winding is further performed beyond the recess 10P. The winding 51 wound without exceeding the recess 10P was wound as the first portion 51a beyond the recess 10P without hatching the cross section (virtual cross section for clarifying the winding method). The winding 51 is hatched in the virtual cross section as the second portion 51b.

  The outer peripheral wall 10c of the winding housing portion 10B is in contact with the first surface 10b and the second surface 10e of the tooth portion 11B when viewed along the extending direction R11 of the tooth portion 11B sandwiched by the winding housing portion 10B. It is on the outer peripheral side from the position C. That is, the perpendicular foot S drawn down from the position of the outermost circumference in the radial direction R101, R102 of the winding housing part 10B to the radial direction R11 in which the tooth part 11B sandwiched by the winding housing part 10B extends is the tooth part 11B. From the position C at which the first surface 10b and the second surface 10e contact each other, it coincides with the foot T of the perpendicular line dropped in the radial direction R11 or is on the outer peripheral side.

  Therefore, even if the tip of the winding nozzle 40 reaches the outer peripheral wall 10c (positions 40c and 40d), at least in the recess 10P, the winding is wound around the tooth portion 11B with a predetermined tension using direct winding. And it is easy to wind in alignment.

  Increasing the number of windings 51 wound in an aligned manner is important for increasing the winding space factor, and therefore it is desirable to have a wide recess 10P. From this point of view, it is desirable that the convex portion 11a extends until the tip thereof is positioned on the extension of the third surface 10f when viewed from the Z-axis direction. Further, it is desirable that the first surface 10b is expanded until the perpendicular foot T with respect to the position C and the perpendicular foot S with respect to the outermost circumferential position of the winding storage portion 10B coincide.

  The first portion 51a of the winding 51 wound on the tooth portion 11B side of the convex portion 14, that is, in the concave portion 10P, does not have a space that can be wound on the outer peripheral side of the second surface 10e. Therefore, in the state until the first portion 51a is completely wound, the gap 54 exists on the outer circumferential side of the winding frame 30 in the radial direction.

  The second portion 51b of the winding 51 wound beyond the recess 10P is wound further away from the tooth portion 11B than the first portion 51a in the winding storage portion 10B, so to speak, more than the first portion 51a. Located in the high rise.

  However, since the gap 54 is present as described above, a part of the second portion 51 b is wound in contact with the bottom 30 b of the winding frame 30. That is, the first portion 51a of the winding 51 and a part of the second portion 51b are wound at the same height at the end of the tooth portion 11B in the Z-axis direction. In the frame 30, a gradient is formed in which the number of layers of the winding 51 decreases from the inner peripheral side to the outer peripheral side. As a result, the winding 51 spills out to the outer peripheral side of the winding storage portion 10B, and the gap 53 described with reference to FIG. 15 does not remain, and the winding space factor can be increased.

  It is conceivable that the area of the concave portion 13 of the winding housing portion 10 as viewed from the Z-axis direction is reduced by providing the convex portion 14. However, if the depth d (see FIG. 9) of the concave portion 23 provided at a position facing the tooth portion 11B in the connecting portion 22 and opening toward the outer peripheral side is made shallow, the outer peripheral wall 10c is further set on the outer peripheral side. It is possible to increase the number of windings by expanding the winding housing portion 10B.

  In this case, even if the depth d of the recess 23 is reduced, a further recess 15 can be provided for the recess 23 in order not to narrow the path through which the lubricating oil passes. The recessed part 15 is arrange | positioned facing the intermediate position of a pair of 1st surface 10b of the tooth | gear part 11B. Due to the presence of the convex portion 14, the magnetic flux passing through the annular core 100 </ b> B slightly passes closer to the tooth portion 11 </ b> B. Therefore, even if the recess 15 is provided, the influence of obstructing the passage of the magnetic flux is small.

  FIG. 12 is a cross-sectional view illustrating a configuration of a compressor 700 to which the annular cores 100A and 100B according to the present invention can be applied, and shows a cross section parallel to the Z-axis direction described in the above embodiment.

  The refrigerant supplied from the refrigerant supply port 701 to the compressor 700 is compressed by the scroll piston 703 and discharged from the refrigerant discharge port 702. The scroll piston 703 is rotated by the crankshaft 705. The crankshaft 705 is rotated by the rotor 300. A stator 100 is provided around the rotor 300, and the rotor 300 and the stator 100 constitute an electric motor.

  As the rotor 300, the rotors 300A and 300B described in the above embodiment can be employed. As the annular core of the stator 100, the annular cores 100A and 100B described in the above embodiment can be employed. A notch 704 is provided on the outer peripheral side of the stator 100, through which lubricating oil passes. The notches 704 can employ the recesses 13, 15, and 23 described in the above embodiment.

It is sectional drawing which shows the structure of the annular core concerning the 1st Embodiment of this invention. It is sectional drawing which illustrates the structure of a rotor. It is a top view which shows one vicinity of the tooth | gear part concerning the 1st Embodiment of this invention. It is a perspective view which partially fractures | ruptures and shows one vicinity of the tooth | gear part concerning the 1st Embodiment of this invention. It is sectional drawing which shows an example of the desirable deformation | transformation of the 1st Embodiment of this invention. It is sectional drawing which shows the more desirable aspect of the 1st Embodiment of this invention. It is sectional drawing which shows the structure of the annular core concerning the 2nd Embodiment of this invention. It is sectional drawing which illustrates the structure of a rotor. It is a top view which shows one vicinity of the tooth | gear part concerning the 2nd Embodiment of this invention. It is a perspective view which partially fractures | ruptures and shows one vicinity of the tooth | gear part concerning the 2nd Embodiment of this invention. It is a perspective view which partially fractures | ruptures and shows one vicinity of the tooth | gear part concerning the 2nd Embodiment of this invention. It is sectional drawing which illustrates the structure of the compressor which can apply the technique concerning this invention. It is sectional drawing which illustrates the annular core of the conventional stator. It is a top view which shows a mode that a coil | winding is wound around the tooth | gear part of the conventional stator. It is a perspective view which fractures | ruptures and shows the structure of the vicinity of the conventional tooth part.

Explanation of symbols

10b 1st surface 10c Outer peripheral wall 10d, 10e 2nd surface 10f 3rd surface 10A, 10B Winding storage part 11a, 14 Convex part 11A, 11B Teeth part 12A, 12B Connection part 51 Winding 51a 1st part 51b 2nd part 60 Insulating material

Claims (5)

A plurality of magnetic layers (100A) laminated in the central axis direction (Z);
A stator comprising a winding (51) wound in a direct winding around the plurality of magnetic layers,
Each of the magnetic layers is
A plurality of teeth (11A) extending in the radial direction (R11) when viewed from the central axis;
Integrally having a connecting portion (12A) for connecting the tooth portions in an annular shape;
The tooth portion is
A pair of first surfaces (10b) parallel to the extending direction (R11) of the tooth portion as seen from the central axis direction;
A pair of second surfaces (10d) in contact with the first surface at angles (θ1, θ2) larger than 90 degrees with respect to the extending direction when viewed from the central axis direction;
A pair of adjacent tooth portions forms a winding storage portion (10A) in which the winding is stored,
A pair of adjacent winding storage portions sandwich one tooth portion,
A leg of a perpendicular line (10) from the outermost circumferential position (10c) in the radial direction (R101, R102) of the winding housing portion in the extending direction (R11) of the tooth portion sandwiched by the winding housing portion ( S) is Ri or the outer peripheral side der coincides with the teeth of the first surface and the second surface are in contact position (B) from the perpendicular drawn to the extending direction foot (G),
The second surface (10d) and the extending direction (R11) and the angle formed by the you increase toward the outer peripheral side, the stator of the electric motor.   The stator of the electric motor according to claim 1, wherein an angle formed by the second surface (10d) and the extending direction (R11) is less than 180 degrees. Wherein the second surface Ru insulating member (60) is provided with a fine groove for storing the winding individually, the stator of the electric motor according to claim 1 or claim 2.   An electric motor having the stator according to any one of claims 1 to 3.   A compressor provided with the electric motor according to claim 4.

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