JP6972658B2 - Motors and compressors - Google Patents

Description

The present invention relates to a technique of a motor or the like including a stator core composed of a plurality of magnetic plates laminated.

Conventionally, compressors used in air conditioners and refrigerators have been widely known. This type of compressor is generally configured by arranging a compression unit, a motor for driving the compression unit, and the like inside the shell.

As the motor, a radial gap type motor is generally used. The motor includes a stator and a rotor. The stator of the motor has an annular back yoke portion, a stator core including a teeth portion, and a coil wound around the teeth portion. The stator core is formed by laminating a plurality of magnetic plates in the thickness direction of the magnetic plates.

In laminating each magnetic plate constituting the stator core, a method of joining the magnetic plates by crimping is often used (see Patent Documents 1 and 2 below). The crimping portion formed by crimping is generally composed of a concave portion formed on one surface side of each magnetic plate and a convex portion formed on the other surface side of each magnetic plate. ing. After the plurality of magnetic plates are stacked on each other, they are pressed in the thickness direction. At this time, the magnetic plates are joined by fitting the convex portion of one of the two magnetic plates adjacent to each other into the concave portion of the other magnetic plate.

On the other hand, on the surface of each magnetic plate constituting the stator core, a semi-organic insulating film is coated on the surface of the magnetic material to form an insulating layer in order to prevent a short circuit due to direct contact between the magnetic materials. .. However, in the portion where the coating is cut by crimping and the convex portion is fitted in the concave portion, the insulating layer is peeled off, and in this portion, a short circuit occurs due to direct contact between the magnetic materials. There's a problem. Therefore, from the viewpoint of preventing a short circuit due to direct contact of the magnetic material, it is preferable that there are few places where crimping is performed.

Japanese Unexamined Patent Publication No. 2008-43102 Japanese Patent No. 5623498

However, if the number of places where crimping is performed is reduced, the distance between the crimped portions becomes large. In this case, the thickness of the stator core becomes thicker at the place where the crimping is performed, and the thickness of the stator core becomes thinner near the intermediate position between the crimping where the crimping is not performed. As a result, there is a problem that the flatness of the end face in the thickness direction of the stator core is lowered.

On the other hand, an insulating member called an insulator is generally arranged on the end face in the thickness direction of the stator core in order to insulate the tooth portion and the coil. Therefore, if the flatness of the end face in the thickness direction of the stator core is lowered, a gap is generated between the stator core and the insulator. Therefore, when the coil is wound around the teeth portion, the insulator is deformed and a load is applied, so that the insulator may be damaged.

In view of the above circumstances, an object of the present invention is to provide a technique capable of improving the flatness of the end face in the thickness direction of the stator core.

In order to achieve the above object, the motor according to the present invention includes an annular back yoke portion and a plurality of teeth portions provided so as to extend from the back yoke portion, and a plurality of magnetic plates are laminated in the thickness direction. A stator having a stator core configured by being crimped and crimped, a coil wound around the teeth portion, an insulator that insulates the stator core and the coil, and a rotor rotated by a magnetic field from the stator. Each magnetic plate has a concave portion for crimping on one surface side and a convex portion for crimping on the other surface side, and is laminated and adjacent in the thickness direction. A crimping portion in which the crimping convex portion of the other magnetic plate is fitted into the crimping recess of one of the magnetic plates, and a recess on one surface side of each magnetic plate. And a gap forming portion having a convex portion on the other surface side and forming a gap between the magnetic plates by at least contacting the convex portion with the magnetic plates that are laminated and adjacent in the thickness direction. The crimping portion and the gap forming portion are provided in the back yoke portion.

In this motor, a gap is formed between the magnetic plates by the gap forming portion, so that the flatness of the end face in the thickness direction of the stator core can be improved.

In the motor, the crimping portions are provided at a plurality of locations in the circumferential direction of the back yoke portion, and the gap forming portions are provided between two crimping portions adjacent to each other in the circumferential direction of the back yoke portion. It may be provided in the area of.

As a result, the flatness of the end face in the thickness direction of the stator core can be appropriately improved.

In the motor, the gap forming portion may be provided at an intermediate position between two crimping portions adjacent to each other in the circumferential direction of the back yoke portion.

As a result, the flatness of the end face in the thickness direction of the stator core can be appropriately improved.

In the motor, the stator core further includes a slot formed between the teeth portions for accommodating the coil, and the gap forming portion may be provided in the back yoke portion at a position corresponding to the slot. ..

As a result, the flatness of the end face in the thickness direction of the stator core can be appropriately improved.

The compressor according to the present invention includes the above motor.

According to the present invention, the flatness of the end face in the thickness direction of the stator core can be improved.

It is a partial cross-sectional view which looked at the compressor from the side. It is the figure which removed the top shell from the main shell, and looked at the motor from above. It is sectional drawing between A and A'shown in FIG. 1, and is the top view of the stator which constitutes a part of a motor. It is a top view which shows the stator core which constitutes a part of a stator. It is a top view which shows the upper insulator which constitutes a part of a stator. FIG. 4 is a cross-sectional view taken along the line between BB'shown in FIG. 4 and is a view of the stator core viewed from the inside in the radial direction. It is a figure for demonstrating the principle that a gap is generated between each magnetic plate by a crimping part, and is a side enlarged view which shows a crimping part. It is a figure for demonstrating the principle that a gap is generated between each magnetic plate by a crimping part, and is a side enlarged view which shows a crimping part. It is sectional drawing which shows the stator core which concerns on a comparative example. It is sectional drawing which shows the stator core which concerns on a comparative example. It is a figure which shows the deformation example of the concave part and the convex part in a gap forming part. It is a figure which shows the deformation example of the concave part and the convex part in a gap forming part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<< First Embodiment >>
<Overall configuration of compressor 100 and configuration of each part>
FIG. 1 is a partial cross-sectional view of the compressor 100 as viewed from the side. In FIG. 1, a part of the shell 10 and the compression portion 50 is partially displayed as a cross section.

As shown in FIG. 1, the compressor 100 internally houses a shaft 70, a motor 20, a compression unit 50 driven by the motor 20 via the shaft 70, a shaft 70, a motor 20, and a compression unit 50. It also has a shell 10 that forms a closed space.

Although not shown, the compressor 100 includes an accumulator arranged on the side of the shell 10. This accumulator is arranged on the refrigerant suction side of the compressor 100. The accumulator separates the gaseous refrigerant and the liquid refrigerant and houses them inside, and supplies the gaseous refrigerant to the compression unit 50.

In the description of the present specification, the stretching direction of the shaft 70 is referred to as an axial direction (Z-axis direction). As will be described later, the shaft 70 is formed in a columnar shape and is rotatably supported by the upper plate member 57 and the lower plate member 58. Further, the rotation direction of the shaft 70 is called the circumferential direction (θ direction), and the direction perpendicular to the axial direction of the shaft 70 is called the radial direction.

[Shell 10]
The shell 10 has a cylindrical main shell 1 that is long in the axial direction (Z-axis direction) and has an open upper portion and a lower portion. Further, the shell 10 has a top shell 2 that seals the upper part of the main shell 1 and a bottom shell 3 that seals the lower part of the main shell 1.

A discharge pipe 4 for discharging the refrigerant compressed by the compression unit 50 to the outside of the shell 10 (for example, an air conditioner, a refrigerator, etc.) is attached to the top shell 2. Further, a terminal block 6 for holding a terminal 5 for supplying electric power to the motor 20 is attached to the top shell 2.

Two joint pipes 11 are inserted into the lower positions of the main shell 1, and a suction pipe 12 for supplying the refrigerant from the accumulator to the compression unit 50 is connected to the joint pipe 11.

[Compression unit 50]
The compression unit 50 includes cylinders 51a and 51b arranged so as to be aligned in the axial direction (Z-axis direction), annular pistons 52a and 52b arranged inside the cylinders 51a and 51b, and the inside of the annular pistons 52a and 52b. It has eccentric cranks 53a and 53b arranged in. Further, the compression unit 50 has vanes 54a and 54b that abut on the annular pistons 52a and 52b, and spring members 55a and 55b that urge the vanes 54a and 54b toward the annular piston 52 side (inside in the radial direction). doing.

Further, the compression unit 50 is arranged below the partition plate 56 interposed between the two cylinders 51, the upper plate member 57 arranged above the upper cylinder 51a, and the lower cylinder 51b. It has a lower plate member 58. Further, the compression unit 50 has an upper muffler cover 59 arranged on the upper side of the upper plate member 57 and a lower muffler cover 60 arranged on the lower side of the lower plate member 58.

The eccentric cranks 53a and 53b are fixed to the lower end of the shaft 70 fixed to the rotor core 22 (details will be described later) of the motor 20, and can rotate according to the rotation of the rotor core 22. The upper eccentric crank 53a and the lower eccentric crank 53b are fixed to the shaft 70 with the eccentric phase shifted by 180 °.

The cylinders 51a and 51b have an inner peripheral surface concentric with the shaft 70, and the annular pistons 52a and 52b are arranged in a space surrounded by the inner peripheral surface. The cylinder chambers 66a and 66b are formed by the spaces sandwiched between the inner peripheral surfaces of the cylinders 51a and 51b and the outer peripheral surfaces of the annular pistons 52a and 52b. The cylinders 51a and 51b are provided with suction ports 61a and 61b to which the suction pipe 12 is fitted, and the refrigerant is sucked through the suction ports 61a and 61b. Further, the cylinders 51a and 51b are provided with vane grooves that radiate outward from the center of the cylinder chambers 66a and 66b, and the vanes 54a and 54b can slide in the radial direction along the vane grooves. ing.

The annular pistons 52a and 52b are rotatably fitted to the eccentric cranks 53a and 53b. The annular pistons 52a and 52b are capable of eccentric movement while a part of the outer peripheral surface of the annular pistons 52a and 52b is in contact with the inner peripheral surfaces of the cylinders 51a and 51b in accordance with the rotation of the eccentric cranks 53a and 53b.

The vanes 54a and 54b are thin plate-shaped members in the circumferential direction (θ direction), and are urged toward the annular pistons 52a and 52b by the urging force of the spring members 55a and 55b. Since the vanes 54a and 54b are urged toward the annular pistons 52a and 52b, even if the annular pistons 52a and 52b move eccentrically, their tips (inner in the radial direction) are the outer circumferences of the annular pistons 52a and 52b. It is always in contact with the surface. That is, when the annular pistons 52a and 52b move eccentrically, the vanes 54a and 54b can reciprocate in the vane groove following the eccentric movement.

The cylinder chambers 66a and 66b are partitioned by the vanes 54a and 54b, and the cylinder chambers 66a and 66b are separated into two chambers, a suction chamber and a compression chamber. When the annular pistons 52a and 52b move eccentrically in the cylinders 51a and 51b, the volumes of the two chambers change continuously (when the volume of one chamber increases, the volume of the other decreases). 50 is capable of sucking in and compressing the refrigerant.

The upper plate member 57 is a member that closes the upper cylinder 51a together with the partition plate 56. The upper plate member 57 rotatably supports the shaft 70 of the motor 20 at the center thereof. Further, the outer peripheral surface of the upper plate member 57 is welded to the main shell 1 through a welding hole (not shown) provided in the main shell 1.

Each member (upper muffler cover 59, upper plate member 57, upper cylinder 51a, partition plate 56, lower cylinder 51b, lower plate member 58, lower muffler cover 60) constituting the compression unit 50 is a bolt 62. Are integrally connected by. Therefore, by fixing the outer peripheral surface of the upper plate member 57 to the main shell 1, the compression portion 50 is integrally fixed to the inside of the shell 10.

The upper muffler cover 59 is a member for forming the upper muffler chamber 63 with the upper plate member 57. Further, the refrigerant compressed by the upper compression chamber is guided to the muffler chamber 63.

The lower plate member 58 is a member that closes the lower cylinder 51b together with the partition plate 56. The lower plate member 58 rotatably supports the shaft 70 of the motor 20 at the center thereof.

The lower muffler cover 60 is a member for forming the lower muffler chamber 64 with the lower plate member 58. The refrigerant compressed by the lower compression chamber is guided to the lower muffler chamber 64. The refrigerant guided to the lower muffler chamber 64 passes through the lower plate member 58, the lower cylinder 51b, the partition plate 56, the upper cylinder 51a, and the refrigerant passage (not shown) penetrating the upper plate member 57. Then, it is guided to the upper muffler room 63. The refrigerant guided to the upper muffler chamber 63 is discharged into the space inside the shell 10.

Lubricating oil is sealed in the main shell 1 up to the height of the upper cylinder 51a. This lubricating oil is sucked up from the oil supply pipe 65 attached to the lower end of the shaft 70 by a blade pump (not shown) inserted in the lower part of the shaft 70, and circulates in the compression portion 50. As a result, the lubricating oil seals the minute gaps in the compression portion 50 while lubricating the movement of each portion in the compression portion 50.

[Motor 20]
FIG. 2 is a view of the motor 20 viewed from above with the top shell 2 removed from the main shell 1. FIG. 3 is a cross-sectional view taken along the line AA'shown in FIG. 1 and is a top view of the stator 30 constituting a part of the motor 20. In FIG. 3, the rotor 21 is omitted. FIG. 4 is a top view showing a stator core 31 forming a part of the stator 30. FIG. 5 is a top view showing an upper insulator 41 constituting a part of the stator 30.

With reference to FIGS. 1 to 5, the motor 20 according to the present embodiment is, for example, a radial gap type motor 20 and includes a stator 30 and a rotor 21 that is rotated by a magnetic field from the stator 30. The rotor 21 has a rotor core 22 and a plurality of permanent magnets 23. Further, the stator 30 has a stator core 31, a plurality of coils 40, a plurality of insulating films 39, an upper insulator 41, and a lower insulator 42.

In the rotor core 22, thin magnetic plates formed of a magnetic material are laminated in the axial direction. The rotor core 22 is a columnar member having a through hole 24 provided in the center thereof along the axial direction. The upper part of the shaft 70 is inserted and fixed in the through hole 24 of the rotor core 22. The plurality of permanent magnets 23 are arranged inside the rotor core 22 at equal intervals in the circumferential direction.

Similar to the rotor core 22, the stator core 31 has thin magnetic plates 36 formed of a magnetic material laminated in the axial direction (thickness direction of the magnetic plate 36) (see FIG. 6 described later). The stator core 31 has an annular back yoke portion 32 and a plurality of teeth portions 34 provided on the back yoke portion 32. A rotor 21 is arranged at a position inside the teeth portion 34 in the radial direction (that is, the center of the stator core 31) via a radial gap.

The back yoke portion 32 is formed concentrically with the shaft 70 in an annular shape. A cut portion 33 having an outer peripheral surface cut along the axial direction is formed on the outer peripheral surface of the back yoke portion 32.

The cut portions 33 are formed at positions corresponding to the positions where the teeth portions 34 are provided (positions on the outer side in the radial direction), and in the present embodiment, the cut portions 33 are equidistant (40 °) in the circumferential direction. ), Nine are formed. A gap 71 is formed between the cut portion 33 and the main shell 1. The gap 71 penetrates the motor 20 in the axial direction. The gap 71 is used as a passage for returning the lubricating oil discharged together with the refrigerant to the upper side of the motor 20 by the compression unit 50 to the lower side of the motor 20.

The outer peripheral surface of the back yoke portion 32 is welded to the main shell 10 through a welding hole (not shown) provided in the main shell 10 at a portion where the cut portion 33 is not formed.

The tooth portion 34 is provided so as to extend radially inward from the inner peripheral surface of the back yoke portion 32. Further, the teeth portions 34 are arranged at equal intervals (40 °) in the circumferential direction, and in the present embodiment, the number of teeth portions 34 is nine. The coil 40 is wound around each of the nine tooth portions 34.

Slots 35 are formed between two tooth portions 34 adjacent to each other (nine in this embodiment). An insulating film 39 made of an insulating material such as resin is arranged in the slot 35.

The insulating film 39, the upper insulator 41, and the lower insulator 42 are arranged between the stator core 31 (teeth portion 34 and the back yoke portion 32) and the coil 40, and are members for insulating the stator core 31 and the coil. Is. The insulating film 39 is provided inside the slot 35 so as to cover a pair of side surfaces facing each other in two tooth portions 34 adjacent to each other and an inner peripheral surface of the back yoke portion 32.

The upper insulator 41 and the lower insulator 42 are formed of an insulating material such as resin. The upper insulator 41 is arranged on the upper surface side of the stator core 31, and the lower insulator 42 is arranged on the lower surface side of the stator core 31.

The upper insulator 41 and the lower insulator 42 have basically the same configuration. Therefore, the upper insulator 41 will be typically described (particularly, see FIG. 5).

The upper insulator 41 includes a tubular portion 43, a plurality of covering portions 44 supported by the tubular portion 43 and covering the upper surface side of the plurality of teeth portions 34, and a plurality of claw portions 45 provided at the tip of the covering portion 44. Have.

The tubular portion 43 is formed in a cylindrical shape short in the axial direction. The diameter of the tubular portion 43 is slightly larger than the diameter of the inner peripheral surface of the back yoke portion 32 of the stator core 31, and the tubular portion 43 is arranged on the upper surface side of the back yoke portion 32.

The covering portion 44 is formed so as to extend radially inward from the tubular portion 43. Further, the covering portion 44 is formed in a thin plate shape in the axial direction. Similar to the teeth portion 34 of the stator core 31, the covering portions 44 are arranged at equal intervals (40 °) in the circumferential direction, and in the present embodiment, the number of the covering portions 44 is nine.

The covering portion 44 has the same shape and area (XY plane) as the upper surface of the teeth portion 34, and is configured to be able to cover the entire upper surface of the teeth portion 34. Further, the covering portion 44 is interposed between the upper surface of the teeth portion 34 and the coil 40 when the coil 40 is wound around the teeth portion 34.

The claw portion 45 is erected toward the upper side at the tip (inside in the radial direction) of the covering portion 44, and is arranged at a position corresponding to the inner end portion in the radial direction in the tooth portion 34. The claw portion 45 supports the coil 40 so that the coil 40 does not come off from the tooth portion 34 by sandwiching the coil 40 from both sides with the tubular portion 43 in the radial direction.

[Clamping portion 37 and gap forming portion 38]
Next, the crimping portion 37 included in the stator core 31 and the gap forming portion 38 will be described.

The crimping portion 37 is arranged at a predetermined interval in the circumferential direction in the back yoke portion 32 of the stator core 31. For example, the crimping portion 37 has a portion arranged with an interval of 40 ° along the circumferential direction and a portion arranged with an interval of 80 ° in the circumferential direction.

Here, assuming that the crimping portions 37 are arranged at equal intervals of 40 ° in the circumferential direction, the number of crimping portions 37 is nine. On the other hand, if the number of crimping portions 37 is large, the number of short-circuited portions due to contact with the magnetic plate 36 increases. Therefore, for example, in the present embodiment, the number of crimping portions 37 is reduced by 3 to 6 and the number of crimping portions 37 is 6, and 3 points at 120 ° intervals as compared with the case where there are 9 crimping portions 37. The crimping portion 37 is not arranged at the position corresponding to.

Therefore, the crimping portions 37 are arranged alternately at intervals of 40 ° and 80 ° in the circumferential direction. Further, the crimping portion 37 is arranged at a position corresponding to the center of the slot 35 in the circumferential direction.

The gap forming portion 38 is provided in a region between two crimping portions 37 adjacent to each other in the circumferential direction of the back yoke portion 32. In particular, in the present embodiment, the gap forming portion 38 is provided at an intermediate position between the two crimping portions 37 adjacent to each other in the circumferential direction of the back yoke portion 32.

Specifically, in the present embodiment, the gap forming portion 38 is located at an intermediate position between the two crimping portions 37 in the region between the two crimping portions 37 arranged at intervals of 80 °. Is located in. Three of the gap forming portions 38 are arranged at positions corresponding to the centers of the slots 35 in the circumferential direction with an interval of 120.

That is, in the present embodiment, the crimping portion 37 and the gap forming portion 38 are summed up in the circumferential direction with an equal interval of 40 ° in the order of the crimping portion 37, the crimping portion 37, and the gap forming portion 38. Nine are arranged in.

FIG. 6 is a cross-sectional view between BB'shown in FIG. 4 (cross-sectional view of the stator core 31 in the circumferential direction (θ direction)), and is a view of the stator core 31 viewed from the inside in the radial direction. Further, on the upper side of FIG. 6, a state when the crimping portion 37 and the gap forming portion 38 are viewed from above is also shown.

As shown in FIG. 6, the stator core 31 of the stator 30 is configured by laminating a plurality of magnetic plates 36 in the thickness direction (Z-axis direction: axial direction) of the magnetic plates 36. The thickness of the magnetic plate 36 is, for example, 0.3 mm to 0.5 mm. Although not shown, insulating layers such as an oxide film are formed on the upper surface and the lower surface of each magnetic plate 36 by surface treatment.

A concave portion 37a for crimping and a convex portion 37b for crimping are formed on each magnetic plate 36, respectively. The concave portion 37a and the convex portion 37b for crimping are formed by press-molding each magnetic plate 36, which will be described later. By press-molding each magnetic plate 36, a recess 37a for crimping is formed on the upper surface side of the magnetic plate 36, and a convex portion 37b for crimping is formed on the lower surface side of the magnetic plate 36. The crimping portion 37 is formed by a crimping concave portion 37a and a crimping convex portion 37b. Specifically, in the crimping portion 37, among the magnetic plates 36 that are laminated and adjacent in the thickness direction, the convex portion 37b for crimping the magnetic plate 36 adjacent to the upper side is adjacent to the lower side. It is formed by fitting into the crimping recess 37a of the magnetic plate 36.

Of the magnetic plates 36, the magnetic plate 36 arranged at the bottom does not have a recess 37a for crimping and a convex portion 37b for crimping, and an opening 72 is formed instead of these. Will be done. A convex portion 37b for crimping the magnetic plate 36 arranged second from the lower side is fitted into the opening 72.

In the present embodiment, so-called V-shaped crimping is exemplified in order to ensure the bonding strength of each magnetic plate 36 even if the number of crimping portions 37 is reduced. In the V-shaped crimping, the crimping concave portion 37a and the crimping convex portion 37b are crimped so as to protrude from the magnetic plate 36 in a V shape. The shapes of the concave portion 37a for crimping and the convex portion 37b for crimping are not limited to V-shaped crimping, and can be appropriately changed, for example, by crimping a round dowel.

The crimping recess 37a and the crimping protrusion 37b are formed by press-molding each magnetic plate 36, respectively. In press molding, the magnetic plate 36 is pressed from the upper surface side, the upper surface of the magnetic plate 36 bends in the thickness direction, and a recess 37a for crimping is formed. Further, at this time, the lower surface side of the magnetic plate 36 is bent in the thickness direction and protrudes to form a convex portion 37b for crimping. In the present embodiment, the portion where the upper surface of the magnetic plate 36 bends in the thickness direction is called the upper bending portion 371 (see FIG. 7 described later), and the portion where the lower surface of the magnetic plate 36 bends is called the lower bending portion 372 (see the figure below). 7).

The magnetic plates 36 are stacked one on the other and then pressed in the thickness direction to be crimped. That is, when the stacked magnetic plates 36 are pressed, the crimping convex portions 37b are fitted into the crimping concave portions 37a, so that each magnetic plate 36 is crimped.

In the case of V-shaped crimping, since the side surface portions of the crimping concave portion 37a and the crimping convex portion 37b are cut from the magnetic plate 36, the coating film is cut and the convex portion 37b is not covered with the insulating layer. The side surface of the is exposed. Therefore, the tip of the convex portion 37b for crimping is fitted into the concave portion 37a of the lower magnetic plate 36, so that the upper and lower magnetic plates 37 are electrically conductive. At this portion, the two adjacent magnetic plates 36 come into direct contact with each other, resulting in a short circuit. Therefore, in the present embodiment, the number of crimping portions 37 is reduced.

Further, among the adjacent magnetic plates 36 laminated in the thickness direction, the convex portion 37b for crimping the magnetic plate 36 adjacent to the upper side is the concave portion for crimping the other magnetic plate 36 adjacent to the lower side. When fitted into 37a, the lower bent portion 372 of the magnetic plate 36 adjacent to the upper side and the upper bent portion 371 of the other magnetic plate 36 adjacent to the lower side do not come close to each other (in other words, the lower bent portion 372 and the lower bent portion 372). (The position of the upper bent portion 371 is displaced), so that the convex portion 37b for crimping does not completely fit into the concave portion 37a for crimping. Therefore, a gap is generated between the magnetic plates 36 in the vicinity of the crimping portion 37.

7 and 8 are views for explaining the principle that a gap is generated between the magnetic plates 36 by the crimping portion 37, and is a side enlarged view showing the crimping portion 37.

In FIGS. 7 and 8, the angle φ at which the concave portion 37a for crimping and the convex portion 37b for crimping are inclined with respect to the upper surface of the magnetic plate 36 are different from each other. FIG. 7 shows an example when the angle φ is 30 °, and FIG. 8 shows a case where the angle φ is 45 °.

As shown in FIGS. 7 and 8, the distance H between the upper surface of the magnetic plate 36 and the upper surface of the adjacent magnetic plate 36 is a function of the angle φ and the thickness T of the magnetic plate 36, and H = (. It can be expressed as 1 / cosφ) T.

As shown in FIG. 7, when the angle φ is 30 °, the distance H is 1.157T, while as shown in FIG. 8, when the angle φ is 45 °, the distance H is 1. It is 414T. The size C of the gap between the two adjacent magnetic plates is the difference between the distance H and the thickness T of the magnetic plates, and therefore C = HT.

Therefore, as shown in FIG. 7, when the angle φ is 30 °, the size C of the gap is 0.157T, and as shown in FIG. 8, when the angle φ is 45 °, the size of the gap is large. C is 0.414T. That is, when the angle φ is 30 °, the gap size C is 0.157 times the thickness T of the magnetic plate 36, and when the angle φ is 45 °, the gap size C is the magnetic plate. It is 0.414 times the thickness T of 36. The original cause of the gap is the misalignment between the upper bent portion 371 and the lower bent portion 372.

With reference to FIG. 6 again, the gap forming portion 38 according to the present embodiment may form a gap equivalent to the gap between the magnetic plates 36 generated in the crimping portion 37 between the magnetic plates 36. It is possible.

Each magnetic plate 36 is formed with a recess 38a for forming a gap and a convex portion 38b for forming a gap. The concave portion 38a for forming the gap and the convex portion 38b for forming the gap are formed by press-molding each magnetic plate 36 in the same manner as the crimping portion 37, which will be described later. By press-molding each magnetic plate 36, a recess 38a for forming a gap is formed on the upper surface side of the magnetic plate 36, and a convex portion 38b for forming a gap is formed on the lower surface side of the magnetic plate 36. The gap forming portion 38 of the present embodiment is formed by a concave portion 38a for forming a gap and a convex portion 38b for forming a gap. Specifically, in the gap forming portion 38, among the magnetic plates 36 laminated and adjacent in the thickness direction, the convex portion 38b for forming the gap of the magnetic plate 36 adjacent to the upper side is adjacent to the lower side. It is formed by abutting (in other words, abutting the edge of the recess 38a) of the gap forming recess 38a of the magnetic plate 36.

Of the magnetic plates 36, the magnetic plate 36 arranged at the bottom does not have a recess 38a for forming a gap and a convex portion 38b for forming a gap, and an opening 73 is formed instead of these. Will be done. A convex portion 38b for forming a gap of the magnetic plate 36 arranged second from the lower side is fitted into the opening 73.

In the present embodiment, a hemispherical shape is adopted as the shape of the concave portion 38a for forming the gap and the convex portion 38b for forming the gap. The shape of the concave portion 38a for forming the gap and the convex portion 38b for forming the gap may be a conical shape or a polygonal pyramid shape such as a triangular pyramid or a quadrangular pyramid. Further, the shape of the concave portion 38a for forming the gap and the convex portion 38b for forming the gap may be a cylindrical shape or a polygonal prism shape such as a triangular prism or a quadrangular prism. Typically, the shape of the recess 38a for forming the gap and the convex portion 38b for forming the gap is such that the convex portion 38a for forming the gap is the concave portion 38a (or other adjacent magnetic) of the other magnetic plate 36 adjacent to the concave portion 38a. Any shape may be used as long as it can form a gap between the magnetic plates 36 by abutting on the surface of the plate).

The concave portion 38a for forming the gap and the convex portion 38b for forming the gap are formed by press-molding each magnetic plate 36 in the same manner as the concave portion 37a for crimping and the convex portion 37b for crimping. It is formed. In press molding, the magnetic plate 36 is pressed from the upper surface side to form a gap forming recess 38a. At this time, a position corresponding to the gap forming recess 38a protrudes on the lower surface side to form a gap. The convex portion 38b is formed.

However, the convex portion 38b and the concave portion 38a for forming the gap are different from the concave portion 37a for crimping and the convex portion 37b for crimping in that the convex portion 38b and the concave portion 38a are formed without cutting the magnetic plate 36. Since the magnetic plate 36 is not cut, the convex portion 38b and the concave portion 38a for forming a gap come into contact with each other via an insulating layer formed on the surface thereof. Therefore, in the gap forming portion 38, the two adjacent magnetic plates 36 do not come into direct contact with each other, so that a short circuit does not occur.

When the convex portion 38b for forming the gap is in contact with the concave portion 38a for forming the gap, the position of the bent portion of the magnetic plate 36 is displaced as in the crimping portion 37, so that the convex portion 38b is used for forming the gap. The convex portion 38b of the above does not completely fit into the concave portion 38a for forming a gap. As a result, a gap is generated between the magnetic plates 36 in the gap forming portion 38 as in the crimping portion 37.

The gap forming portion 38 does not function as a crimping portion unlike the crimping portion 37. That is, the convex portion 38b for forming the gap is only in contact with the concave portion 38a for forming the gap of the other magnetic plate 36 adjacent to the lower side, and the tip portion of the convex portion 38b is formed like the crimping portion 37. It does not fit into the recess 38a. Therefore, even if a force in the direction of compressing each magnetic plate 36 is applied, a constant gap is maintained between the magnetic plates 36, but there is almost no drag against the force in the direction of pulling each magnetic plate 36 apart.

<Action, etc.>
Next, the operation and the like according to the present embodiment will be described. In the description here, first, the stator core 31'according to the comparative example will be described. 9 and 10 are cross-sectional views showing a stator core 31'according to a comparative example. FIG. 9 shows a state before the coil 40 is wound around the stator core 31'via the insulators 41 and 42, and FIG. 10 shows a state where the coil 40 is wound around the stator core 31' via the insulators 41 and 42. The state after being done is shown.

Unlike the stator core 31 according to the present embodiment, the stator core 31'according to the comparative example does not have the gap forming portion 38. Other points are the same as those of the present embodiment.

In the stator core 31'according to the comparative example, in order to ensure the strength of the coupling of each magnetic plate 36 even if the number of the crimping portions 37 is reduced, the crimping portions are similarly to the present embodiment. It is assumed that V-shaped crimping is adopted as 37. In this case, as described above, the crimping concave portion 37a and the crimping convex portion 37b are not covered with the coating film in the insulating layer because the side surface portions thereof are cut from the magnetic plate 36. Since the tip of the convex portion 37b for crimping is fitted into the concave portion 37a of the lower magnetic plate 36, the magnetic plate 37 is electrically conductive at the tip portion. Further, as described above in FIGS. 7 and 8, a gap having a size C corresponding to the angle φ and the thickness T of the magnetic plate 36 is formed between the magnetic plates 37.

As the number of the magnetic plates 36 to be laminated increases, the gaps are accumulated in the stacking direction, and the thickness of the stator core 31 becomes thicker at the place where the crimping portion 37 is formed. For example, even if the size of one gap is several microns to several tens of microns, if the number of magnetic plates 36 is 100, the size of one gap is multiplied by about 100, so the total number of gaps is totaled. The size ranges from hundreds of microns to thousands of microns.

On the other hand, when the number of the crimping portions 37 is reduced and the distance between the crimping portions 37 and the crimping portions 37 is widened, the space between the crimping portions 37 and the crimping portions 37 in the circumferential direction is increased. In this region, the magnetic plate 36 tends to bend. For example, when a coil is wound around the teeth portion 34 via the insulators 41 and 42 from the state shown in FIG. 9 and an external force is applied to the region, as shown in FIG. The gap between the magnetic plates 36 becomes narrow in the region. In particular, when the magnetic plate 36 is thinned in order to improve the efficiency of the motor 20, the magnetic plate tends to bend, so that the area between the crimping portion 37 and the crimping portion 37 is between the magnetic plates 36. The gap tends to be narrowed.

As shown in FIG. 10, when the coil 40 is wound around the teeth portion 34 via the insulators 41 and 42, a force is applied from the coil 40 to the insulators 41 and 42. This force acts to press the insulators 41 and 42 against the upper and lower surfaces of the stator core 31. At this time, if a gap is generated between the stator core 31 (particularly the back yoke portion 32) and the insulators 41 and 42 (particularly the portion corresponding to the back yoke portion 32), the back yoke portions in the insulators 41 and 42 A load is applied to the portion corresponding to 32.

For example, in the back yoke portion 32 of the stator core 31', when the number of crimping portions 37 is reduced in the region between the slot 35 and the main shell 1, when the number of crimping portions 37 is reduced, the stator core 31' A gap is generated between (particularly the back yoke portion 32) and the insulators 41 and 42 (particularly the portion corresponding to the back yoke portion 32). The portion where the crimping portion 37 is reduced is a portion corresponding to the slot 35 (in other words, a portion where the teeth portion 34 is not formed), and therefore is a portion having a weak strength in the back yoke portion 32. The gap between the magnetic plates 36 tends to be narrow (the thickness of the stator core 31'is likely to be thin). Further, also in the insulators 41 and 42, the portion corresponding to the slot 35 is a portion having a weak strength among the insulators 41 and 42 (because the insulators 41 and 42 do not have the covering portion 44 and the like).

Therefore, when a force is applied from the coil 40 to the insulators 41 and 42, the insulators 41 and 42 may be damaged such as cracks and cracks in the portion corresponding to the back yoke portion 32. Further, if debris is generated due to damage to the insulators 41 and 42, the debris may be mixed with the lubricating oil or the like circulating in the shell 10, and the motor 20, the compression portion 50, or the like may be damaged.

On the other hand, in the present embodiment, as described above, the gap forming portion 38 is provided in the region between the two crimping portions 37 adjacent to each other in the circumferential direction. Then, the gap forming portion 38 can form a gap equivalent to the gap between the magnetic plates 36 generated in the crimping portion 37 between the magnetic plates 36. Therefore, the flatness of the upper surface and the lower surface of the stator core 31 can be improved.

Further, in the present embodiment, the gap forming portion 38 is provided at an intermediate position between two crimping portions 37 adjacent to each other in the circumferential direction. That is, in the present embodiment, the gap forming portion 38 is provided at an intermediate position between the two crimping portions 37 where the thickness of the stator core 31 becomes the thinnest when there is no gap forming portion 38. This makes it possible to more effectively improve the flatness of the upper surface and the lower surface of the stator core 31.

As described above, in the present embodiment, the flatness of the upper surface and the lower surface of the stator core 31 can be improved, so that it is possible to prevent a gap from being generated between the stator core 31 and the insulators 41 and 42. can. This makes it possible to prevent the insulators 41 and 42 from being damaged. Further, it is possible to prevent the motor 20 and the compression unit 50 from failing due to debris caused by damage to the insulators 41 and 42.

Further, in the present embodiment, the gap forming portion 38 is provided at a position corresponding to the slot 37 in the back yoke portion 32. That is, the gap forming portion 38 is provided at a position corresponding to the slot 37, which is a place where the thickness of the stator core 31 tends to be thin and where the strength of the insulators 41 and 42 is weak. This makes it possible to more effectively improve the flatness of the upper surface and the lower surface of the stator core 31, and more effectively prevent the insulators 41 and 42 from being damaged.

≪Various deformation examples≫
In the above description, the case where the six crimping portions 37 are alternately arranged at intervals of 40 ° and 80 ° has been described. On the other hand, the number of crimping portions 37 and the interval at which the crimping portions 37 are arranged can be appropriately changed and are not particularly limited. For example, the number of crimping portions 37 may be one, two, ..., Etc., and the spacing between the crimping portions 37 may be 60 ° intervals, 90 ° intervals, or the like.

In the above description, the case where the three gap forming portions 38 are arranged at intervals of 120 ° has been described. On the other hand, the number of gap forming portions 38 and the interval at which the gap forming portions 38 are arranged can be appropriately changed and are not particularly limited. For example, the number of crimping portions 37 may be one, two, ..., Etc., and the spacing between the crimping portions 37 may be 60 ° intervals, 90 ° intervals, or the like.

In the above description, the case where the gap forming portion 38 is provided at the intermediate position between the two crimping portions 37 adjacent to each other in the circumferential direction has been described. On the other hand, the position where the gap forming portion 38 is provided can be appropriately changed in this region as long as it is a region between the crimping portions 37 adjacent to each other in the circumferential direction.

In the above description, the case where one gap forming portion 38 is provided in the region between the two crimping portions 37 adjacent to each other has been described. On the other hand, two or more gap forming portions 38 may be provided in the region between the two crimping portions 37 adjacent to each other.

In the above description, the case where the concave portion 37a for crimping is formed on the upper surface of the magnetic plate 36 and the convex portion 37b for crimping is formed on the lower surface of the magnetic plate 36 has been described. On the other hand, the recess 37a for crimping may be formed on the lower surface of the magnetic plate 36, and the convex portion 37b for crimping may be formed on the upper surface of the magnetic plate 36.

In the above description, the case where the recess 38a for forming the gap is formed on the upper surface of the magnetic plate 36 and the convex portion 38b for forming the gap is formed on the lower surface of the magnetic plate 36 has been described. On the other hand, the recess 38a for forming the gap may be formed on the lower surface of the magnetic plate 36, and the convex portion 38b for forming the gap may be formed on the upper surface of the magnetic plate 36.

In the above description, the concave portion 37a for crimping and the concave portion 38a for forming a gap are formed on the same surface side, and the convex portion 37b for crimping and the convex portion 38b for forming a gap are formed on the same surface side. I explained the case. On the other hand, the concave portion 37a for crimping and the concave portion 38a for forming a gap may be formed on different surface sides, and the convex portion 37b for crimping and the convex portion 38b for forming a gap may be formed on different surface sides. ..

11 and 12 are views showing deformation examples of the concave portion for forming a gap and the convex portion for forming a gap.

In the example shown in FIG. 11, the concave portion 38'a for forming the gap and the convex portion 38'b for forming the gap in the gap forming portion 38'are formed in a cylindrical shape. The diameter A of the recess 38'a for forming the gap is larger than the diameter a of the convex portion 38'b for forming the gap, but the depth D1 of the concave portion 38'a for forming the gap is the convex portion for forming the gap. It is smaller than the height D2 of 38'b. In the example here, the volume of the recess 38'a for forming the gap and the volume of the convex portion 38'b for forming the gap are the same. ^{That, π (A / 2) 2} × D1 = π (a / 2) is a ² × D2, from this equation, an ^{A 2 × D1 = a 2 ×} D2. An insulating layer 81 is formed on the surface of the magnetic plate 36', the bottom of the recess 38'a for forming a gap, and the top of the convex portion 38'b for forming a gap (the recess 38' for forming a gap). There is no insulating layer 81 on the side peripheral surface of the convex portion 38'b for forming the gap), and the convex portion 38'b for forming the gap is the concave portion of the lower magnetic plate 36'via the insulating layer 81. It is in contact with 38'a.

In the example shown in FIG. 12, the concave portion 38 "a" for forming the gap and the convex portion 38 "b for forming the gap in the gap forming portion 38" are formed in a cylindrical shape as in the example shown in FIG. On the other hand, unlike the example shown in FIG. 11, the diameter A'of the recess 38" a for forming the gap is smaller than the diameter a'of the convex portion 38 "b" for forming the gap, and the recess 38 "a" for forming the gap is smaller. The depth D'1 is larger than the height D'2 of the gap forming convex portion 38 "b. The diameter A'of the gap forming concave portion 38" a is the gap forming convex portion 38 "b. In this example, the gap forming convex portion 38 "b does not fit into the gap forming concave portion 38" a because it is smaller than the diameter a'.

In the example here, the volume of the concave portion 38 "a for forming the gap and the volume of the convex portion 38" b for forming the gap are the same. That is, π (A'/2) ² × D'1 = π (a ′ / 2) ² × D'2, and from this equation, A ′ ² × D ′ 1 = a ′ 2 × D ^{′ 2.} be. An insulating layer 81 is formed on the surface of the magnetic plate 36 ", the bottom of the recess 38" a for forming a gap, and the top of the convex portion 38 "b for forming a gap (the recess 38 for forming a gap". There is no insulating layer 81 on the side peripheral surface of the convex portion 38 "b for forming the gap), and the convex portion 38" b for forming the gap is the upper surface of the lower magnetic plate 36 "via the insulating layer 81. Is in contact with.

In the above-mentioned first embodiment, the concave portion 38a for forming a gap of one magnetic plate 38 of the magnetic plate 36 is in contact with the convex portion 38b for forming a gap of the other magnetic plate 36. However, the gap forming portion 38 of the present invention is not limited to this, as long as a gap can be formed between adjacent magnetic plates 36. Therefore, the gap forming portion 38 of the present invention may have at least one convex portion 38b for forming a gap formed in the magnetic plate 36, for example, the convex portion 38b for forming a gap is insulated from the other magnetic plate 38. A gap can be formed by abutting through the layers.

10 ... Shell 20 ... Motor 21 ... Rotor 30 ... Stator 31 ... Stator core 32 ... Back yoke part 34 ... Teeth part 36, 36', 36 "... Magnetic plate 37 ... Crying part 38, 38', 38" ... Gap forming part 40 ... Coil 41 ... Upper insulator 42 ... Lower insulator 70 ... Shaft 100 ... Compressor

Claims (5)

A stator core including an annular back yoke portion and a plurality of teeth portions provided so as to extend from the back yoke portion, and a plurality of magnetic plates laminated and crimped in the thickness direction. A motor including a coil wound around the teeth portion, a stator having an insulator for insulating the stator core and the coil, and a rotor rotated by a magnetic field from the stator.
Each magnetic plate has a concave portion for crimping on one surface side and a convex portion for crimping on the other surface side, and is a magnetic plate of one of the magnetic plates that is laminated and adjacent in the thickness direction. A crimping portion in which the crimping convex portion of the other magnetic plate is fitted into the crimping recess.
Each of the magnetic plates has a recess for forming a gap on one surface side and a convex portion for forming a gap on the other surface side, and at least the gap is formed on the magnetic plates that are laminated and adjacent to each other in the thickness direction. It is provided with a gap forming portion that forms a gap between each magnetic plate by contacting the convex portion for the purpose.
The crimping portion and the gap forming portion are provided in the back yoke portion .
The diameter of the concave portion for forming the gap and the diameter of the convex portion for forming the gap are formed so as to be different from each other.
The gap forming recess has a bottom and a first side peripheral surface.
The gap-forming convex portion has a top portion and a second side peripheral surface.
A motor in which the first side peripheral surface and the second side peripheral surface are not in contact with each other. The motor according to claim 1.
The surface of the plurality of magnetic plates is covered with an insulating layer, and the surface thereof is covered with an insulating layer.
A motor having a region in which the first side peripheral surface of the gap forming recess and the second side peripheral surface of the gap forming convex portion are not covered with the insulating layer. The motor according to claim 1 or 2.
The gap forming portion is a motor provided at an intermediate position between two crimping portions adjacent to each other in the circumferential direction of the back yoke portion. The motor according to any one of claims 1 to 3.
The stator core further includes a slot formed between the teeth portions for accommodating the coil.
The gap forming portion is a motor provided at a position corresponding to the slot in the back yoke portion. A compressor comprising the motor according to any one of claims 1 to 4.

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