JP2013059262A - Stator core and stator and motor and compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator core in which the gap between laminates at a tooth is not shrunk by the pressure of wiring at the time of winding, and the winding is less susceptible to slacking when laminating electromagnetic steel sheets by caulking.SOLUTION: The stator core is configured by laminating a predetermined number of electromagnetic sheets, punched into a predetermined shape, by caulking. The stator core has a ring-like core back, and teeth formed radially inward from the core back. The core back is provided, on each electromagnetic sheet, with a predetermined number of caulked portion of predetermined shape for bonding the electromagnetic sheets. The tooth includes a region provided with the caulked portion, and a region not provided with the caulked portion.

Description

  The present invention relates to a stator core formed by laminating electromagnetic steel sheets, and more particularly, to a caulking used for laminating electromagnetic steel sheets. The present invention also relates to a stator using the stator core. The present invention also relates to an electric motor using the stator. Furthermore, it is related with the compressor using the electric motor.

  For lamination of conventional electromagnetic steel sheets, joining by caulking is used. Caulking can be easily joined by pressing and has high joining strength. However, on the other hand, since the convex portion and the concave portion are press-fitted, distortion and stress are generated in the iron core portion, resulting in a decrease in the magnetic permeability of the electromagnetic steel sheet and an increase in iron loss, leading to deterioration of magnetic properties.

  For this reason, a rotating electrical machine has been proposed that has been devised, such as providing caulking at a position where the influence of an increase in iron loss is small, without blocking the flow of magnetic flux (see, for example, Patent Document 1).

JP 2005-94959 A JP 2008-259349 A JP 2008-253135 A Japanese Patent Laid-Open No. 11-113195 Japanese Utility Model Publication No. 4-28743

  The electromagnetic steel sheet can be easily joined by caulking, but if caulking is provided, stress is generated in the electromagnetic steel sheet by press fitting, resulting in a decrease in magnetic permeability and an increase in iron loss density. That is, loss increases due to caulking. To increase the efficiency of the motor, we want to reduce the number of crimps as much as possible.

  Conventional stator cores are provided with caulking at the teeth portion and the core back portion. The magnetic flux density of the stator is higher in the teeth portion than in the core back portion, and iron loss occurs mainly in the teeth portion. That is, the influence of the iron loss increase due to caulking is greater in the teeth portion than in the core back portion. If the number of caulking is reduced for higher efficiency, it is preferable to reduce caulking of the teeth portion rather than the core back portion.

  However, if caulking is only provided in the core back portion and no caulking is provided in the teeth portion, a problem may occur during winding. A certain gap is formed between the laminated magnetic steel sheets provided with crimps. If the caulking is not provided in the teeth, the gap between the stacks of the teeth is reduced by the winding pressure during winding, and the core width of the teeth is changed before and after the winding. As a result, sagging occurs in the winding at the beginning of winding at the end of winding, which hinders winding properties. It is preferable that the core width does not change greatly before and after the winding.

  The present invention has been made to solve the above-described problems. When electromagnetic steel sheets are laminated by caulking, the gap between the laminations of the teeth portions is not reduced by the winding pressure during winding. To provide a stator core that is less likely to cause slack in the wire.

  A stator using the stator core is also provided.

  Moreover, the electric motor using the stator is provided.

  Furthermore, the compressor using the electric motor is provided.

The stator core according to this invention is
A stator core having a ring-shaped core back and teeth radially formed inward from the core back, which is configured by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape by caulking,
The core back includes a portion to be joined to each electromagnetic steel sheet by caulking in a predetermined shape with a predetermined number of other electromagnetic steel sheets adjacent in the stacking direction,
The teeth include a part to be joined by caulking with another electromagnetic steel sheet adjacent in the stacking direction to some of the electromagnetic steel sheets,
A certain number of electromagnetic steel sheets having portions where the teeth are joined by caulking and electromagnetic steel plates not having a portion where the teeth are joined by caulking are alternately laminated.

  A stator core according to the present invention is configured by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape by caulking, a ring-shaped core back, and teeth formed radially from the core back; The core back includes a caulking portion that joins the electromagnetic steel plates of a predetermined number and a predetermined shape to each of the electromagnetic steel plates, and the teeth include a region including the caulking portion, and a caulking Since the crimping part improves the rigidity of the teeth, it suppresses the gap between the electrical steel sheets of the teeth from shrinking due to the winding pressure during winding. Can solve the problem of sagging. Further, by reducing the number of caulking portions of the teeth having a high magnetic flux density, it is possible to greatly reduce the influence of an increase in iron loss due to caulking.

FIG. 3 shows the first embodiment and is a cross-sectional view of the electric motor 100. FIG. 3 shows the first embodiment and is a longitudinal sectional view of the electric motor 100. FIG. 5 shows the first embodiment, and is a cross-sectional view of the stator 200. FIG. 3 shows the first embodiment and is a plan view of a stator core 201. FIG. FIG. 5 shows the first embodiment and is a plan view of a segment 201a. The figure which shows Embodiment 1 and the figure which shows the state which gave the insulating material 202 to the segment 201a. FIG. 5 shows the first embodiment, and shows a state where a winding 203 is wound on an insulating material 202. FIG. 6 shows the first embodiment, and is a cross-sectional view taken along the line AA of FIG. FIG. 3 shows the first embodiment and is a plan view of the first electromagnetic steel plate 201a-1. Fig. 5 shows the first embodiment, and is a plan view of a second electromagnetic steel plate 201a-2. 5A and 5B are diagrams showing the first embodiment of the present invention, showing the V-caulking 204 (a) is a plan view, (b) is a sectional view taken along line BB in FIG. ). FIG. 5 shows the first embodiment and shows the relationship between the stress generated by caulking and the iron loss density. FIG. 5 shows the first embodiment, and is a magnetic flux diagram during motor operation. FIG. 3 shows the first embodiment and is a cross-sectional view of the rotor 300. FIG. 2 is a diagram illustrating the first embodiment and is a diagram illustrating a segment 201a before winding ((a) is a plan view, and (b) is a cross-sectional view cut by a V-caulking 204). FIG. 5 shows the first embodiment and shows a segment 201a after winding ((a) is a plan view and (b) is a schematic cross-sectional view). FIG. 5 shows the first embodiment and is a diagram showing a segment 501a of a first modification ((a) is a plan view and (b) is a longitudinal sectional view). FIG. 5 shows the first embodiment and is a diagram showing a segment 601a of a second modification ((a) is a plan view and (b) is a longitudinal sectional view). FIG. 8 shows the first embodiment and is a diagram showing a segment 701a of a third modification ((a) is a plan view and (b) is a longitudinal sectional view). It is a figure shown for the comparison, The figure which shows the general segment 801a ((a) is a top view, (b) is a longitudinal cross-sectional view). It is a figure shown for the comparison, The figure which shows the stator segment 800 after the common winding ((a) is a top view, (b) is a longitudinal cross-sectional view). It is a figure shown for the comparison, and is a figure ((a) is a top view and (b) is a longitudinal cross-sectional view) which shows the segment 901a without V caulking in the teeth. It is a figure shown for the comparison, The figure which shows the stator segment 900 after the winding | winding which does not have the caulking of a tooth | gear ((a) is a top view, (b) is a longitudinal cross-sectional view).

Embodiment 1 FIG.
First, features of the present embodiment will be described. The stator core of the present embodiment is substantially T-shaped, and a plurality of segments (divided cores) composed of a core back and teeth are connected to bendable. Each segment is formed by laminating electromagnetic steel sheets punched into a predetermined shape by caulking (for example, V caulking). The core back of each segment is provided with caulking at two locations. Moreover, the teeth of each segment are provided with the area | region which provided the crimp in the lamination direction, and the area | region which does not provide a crimp.

  Generally, caulking presses a convex portion and a concave portion by pressing, so that distortion and stress are generated in the iron core portion. When stress is applied to the electromagnetic steel sheet, the magnetic permeability of the electromagnetic steel sheet is reduced, and the iron loss is increased. As a result, the efficiency and output of the motor are reduced.

  Therefore, from the viewpoint of the efficiency of the electric motor, it is preferable that the number of crimps is small.

  On the other hand, a certain gap is formed between the electromagnetic steel sheets laminated by caulking. Therefore, from the viewpoint of the efficiency of the motor, for example, when caulking is provided only on the core back of each segment and caulking is not provided on the teeth of each segment, when concentrated winding is applied to the teeth, the teeth are The gap between the layers is reduced, and the core width (stack thickness) of the teeth changes before and after winding. At the end of winding, sagging occurs in the winding at the beginning of winding, which hinders the winding property.

  Therefore, the teeth of each segment are provided with a region where caulking is provided in the stacking direction and a region where caulking is not provided, so that both the efficiency of the motor and the winding property can be achieved.

  1 to 19 are diagrams showing the first embodiment. FIG. 1 is a transverse sectional view of the electric motor 100, FIG. 2 is a longitudinal sectional view of the electric motor 100, FIG. 3 is a transverse sectional view of the stator 200, and FIG. FIG. 5 is a plan view of the segment 201a, FIG. 6 is a view showing a state in which the insulating material 202 is applied to the segment 201a, and FIG. 7 is a state in which the winding 203 is wound on the insulating material 202 8 is a cross-sectional view taken along line AA of FIG. 5, FIG. 9 is a plan view of the first electromagnetic steel plate 201a-1, FIG. 10 is a plan view of the second electromagnetic steel plate 201a-2, and FIG. FIGS. 12A and 12B are diagrams showing the caulking 204 (FIG. 12A is a plan view, FIG. 12B is a sectional view taken along the line BB in FIG. 12A, FIG. 12C is a sectional view taken along the line CC in FIG. 12A, and FIG. FIG. 13 is a magnetic flux diagram during motor operation, FIG. 14 is a cross-sectional view of the rotor 300, and FIG. The figure which shows segment 201a before winding ((a) is a top view, (b) is a sectional view cut by V caulking 204), and FIG. 16 is the figure which shows segment 201a after winding ((a) is a top view) , (B) is a schematic cross-sectional view), FIG. 17 is a diagram showing a segment 501a of a first modification ((a) is a plan view, (b) is a vertical cross-sectional view), and FIG. 18 is a segment 601a of a second modification. FIG. 19A is a plan view, FIG. 19B is a diagram showing a segment 701a according to Modification 3 (FIG. 19A is a plan view, and FIG. 19B is a longitudinal sectional view).

  20 to 23 are diagrams for comparison, FIG. 20 is a diagram showing a general segment 801a ((a) is a plan view, (b) is a longitudinal sectional view), and FIG. 21 is a general winding. The figure which shows the stator segment 800 after ((a) is a top view, (b) is a longitudinal cross-sectional view), FIG. 22 is the figure which shows the segment 901a without V caulking in a tooth ((a) is a top view, (b) ) Is a vertical cross-sectional view), and FIG. 23 is a view (a) is a plan view and (b) is a vertical cross-sectional view) of a stator segment 900 after winding without V-caulking on the teeth.

  The electric motor 100 shown in FIGS. 1 and 2 is, for example, a 6-pole brushless DC motor. The electric motor 100 includes a stator 200 and a rotor 300.

  In FIG. 2, in the electric motor 100 including the stator 200 and the rotor 300, for example, the stator 200 is fixed to the hermetic container 400 of the hermetic compressor by shrink fitting or the like. In the rotor 300, the shaft 301 of the rotor 300 is connected to a compression mechanism unit (not shown) fixed to the hermetic container 400.

  A stator 200 shown in FIG. 3 includes a stator core 201 to which nine segments 201a are connected, an insulating material 202 applied to the teeth 206 of the segment 201a, and a winding wound from above the insulating material 202. 203 (concentrated winding).

  As shown in FIG. 4, the stator core 201 is formed by punching and laminating, for example, strips of nine segments 201 a connected by a connecting portion 201 b. However, this is merely an example, and a donut shape that is not divided into segments may be used.

  The connection part 201b which connects the segment 201a of the stator core 201 is comprised by a joint wrap or a thin connection part, for example.

  The material of the stator core 201 is a thin electromagnetic steel sheet (for example, a non-oriented electrical steel sheet having a thickness of about 0.1 to 0.7 mm (a crystal of each crystal so as not to exhibit magnetic properties in a specific direction of the steel sheet). The axial direction is randomly arranged as much as possible)). In one example, a 0.35 mm non-oriented electrical steel sheet is used.

  As shown in FIG. 5, the segment 201 a constituting the stator core 201 is substantially T-shaped as a whole, and includes a tooth 206 around which the winding 203 is wound, and a core back 205. The core back 205 is provided with V caulking 204 (caulking portion) at two places on the left and right. The teeth 206 are a mixture of an electromagnetic steel plate provided with the V-caulking 204 and an electromagnetic steel plate not provided with the V-caulking 204. FIG. 5 shows a case where the electromagnetic steel plate at the end is provided with V-caulking 204.

  As shown in FIG. 6, an insulating material 202 is applied to the segment 201 a constituting the stator core 201. The insulating material 202 may be formed by integral molding of resin, or an insulating material 202 prepared separately may be inserted into the segment 201a.

  As shown in FIG. 7, a three-phase six-pole concentrated winding 203 is applied to each segment 201 a from above the insulating material 202. For the winding 203, a magnet wire or the like in which an insulating film is applied to the outside of the copper wire is used.

  As shown in the cross-sectional view of FIG. 8, the segment 201a is a combination of the first electromagnetic steel plate 201a-1 (see FIG. 9) and the second electromagnetic steel plate 201a-2 (see FIG. 10). In the example of FIG. 8, two first electromagnetic steel plates 201a-1 are arranged at the upper end in the stacking direction of the segments 201a. And the two 2nd electromagnetic steel plates 201a-2 are arrange | positioned under the two 1st electromagnetic steel plates 201a-1. The segment 201a is configured by repeating the combination of the first electromagnetic steel plate 201a-1 and the second electromagnetic steel plate 201a-2.

  As shown in FIG. 9, the first electromagnetic steel plate 201 a-1 is provided with a core back 205 with two V caulkings 204 divided into left and right. Further, one V caulking 204 is provided on the tooth 206.

  The two V crimps 204 of the core back 205 in the first electromagnetic steel plate 201a-1 are arranged so that the longitudinal direction thereof substantially coincides with the circumferential direction.

  As shown in FIG. 10, in the second electromagnetic steel plate 201 a-2, two V caulkings 204 are provided separately on the left and right sides on the core back 205. Further, the teeth 206 are not provided with the V caulking 204.

  Here, the V-caulking 204 will be described with reference to FIG. As shown in FIG. 11A, the V-caulking 204 is rectangular in plan view. The cross section in the long side direction of the rectangular shape of the V-caulking 204 (the BB cross-section in FIG. 11A (FIG. 11B)) is literally V-shaped, so it is called V-caulking. The cross section in the short side direction (CC cross section in FIG. 11A (FIG. 11C)) is rectangular.

  The V caulking 204 is fixed by press-fitting the convex portion 204a into the concave portion 204b (see FIG. 11C). The V caulking 204 has a high bonding force because the side pressure increases because the size of the shape can be arbitrarily taken and the portion bent into the V shape slightly protrudes in the lateral direction. On the other hand, the strain and stress on the iron core due to the side pressure also increase, interrupting the flow of magnetic flux and degrading the magnetic properties of the iron core.

  That is, as shown in FIG. 12, for example, the iron loss density of the electrical steel sheet increases due to the stress when the convex portion 204a of the V-caulking 204 is press-fitted into the concave portion 204b.

  Further, as shown in the magnetic flux diagram during operation of the electric motor shown in FIG. 13, during driving, a gap from the rotor (a gap between the stator and the rotor, for example, a radial width is about 0.3 to 1.0 mm). In one example, the rotor rotates due to the phase relationship between the magnet magnetic flux linked to the stator via 0.75 mm) and the stator magnetic flux generated by energizing the winding. At this time, the magnetic flux passes through the teeth and flows separately along the core back inner diameter side. For this reason, the magnetic flux density is high at the stator teeth and low at the outer periphery of the core back. The higher the magnetic flux density, the greater the iron loss and the greater the increase in iron loss due to caulking. Therefore, it can be said that reducing the number of teeth caulking is effective in reducing iron loss. In FIG. 13, illustration of the stator windings is omitted.

  As shown in FIG. 14, the rotor 300 is a thin electromagnetic steel plate (for example, a non-oriented electrical steel plate having a thickness of about 0.1 to 0.7 mm (biased in a specific direction of the steel plate), like the stator core 201. The crystal axis direction of each crystal is arranged as randomly as possible so as not to show magnetic properties), in one example, 0.35 mm non-oriented electrical steel sheet) is punched into a predetermined shape and a predetermined number of layers are laminated. The rotor core 301 comprised by this, the six permanent magnets 302, and the axis | shaft 304 are provided at least.

  The rotor core 301 is formed with magnet insertion holes 303 having a substantially rectangular cross section along the outer peripheral edge corresponding to the number of magnetic poles (here, 6 poles). Six magnet insertion holes 303 form a substantially hexagonal shape.

  The plate-shaped permanent magnets 302 are accommodated in the six magnet insertion holes 303. The permanent magnet 302 is preferably a neodymium rare earth permanent magnet mainly composed of Nd—Fe—B (neodymium, iron, boron), but may be made of other materials (for example, ferrite). The thickness of the permanent magnet 302 is about 1 to 2 mm.

  Leakage magnetic flux suppression holes 305 for suppressing leakage magnetic flux between the poles are formed at both ends of the magnet insertion hole 303.

  In addition, a shaft 304 that applies torque of the rotor 300 to a load (for example, a compression mechanism portion of a hermetic compressor) is provided at a substantially central portion of the rotor 300. Since the rotor 300 is not the main subject of the present embodiment, a detailed description is omitted.

  Before describing the effect of the stator core 201 of the present embodiment, a general stator core will be described for comparison.

  A general segment 801 a shown in FIG. 20 is obtained by laminating one type of electromagnetic steel sheet 801 a-1 (after punching) with V caulking 804. As shown in FIG. 19, each electromagnetic steel plate 801 a-1 is provided with V caulking 804 at two locations on the core back 805 and V caulking 804 at one location of the teeth 806.

  As shown in FIG. 21, in the stator segment 800 in which the insulating material 802 and the winding 803 are applied to the segment 801a, the V caulking 804 is provided on all the teeth 806 of the electromagnetic steel sheet 801a-1 (after punching). , Teeth 806 has high rigidity. Therefore, the core width in the stacking direction does not change before and after the winding (the core width in the stacking direction is L1 both before and after the winding).

  However, since the V caulking 804 is provided in all the teeth 806 whose magnetic flux density is higher than that of the core back 805, the magnetic force of the electrical steel sheet 801a-1 is caused by the stress generated by pressing the convex portion of the V caulking 804 into the concave portion. Properties (permeability, iron loss density) are reduced. Thereby, the efficiency and output of the electric motor are reduced.

  Further, a segment 901a shown in FIG. 22 is obtained by laminating one type of electrical steel sheet 901a-1 (after punching) with V caulking 904. As shown in FIG. 22, each electromagnetic steel sheet 901 a-1 is provided with V caulking 904 at two locations on the core back 905, but the teeth 906 are not provided with V caulking 904.

  Therefore, in the stator segment 900 shown in FIG. 23, since the V-caulking 904 is not provided in the electromagnetic steel sheet 901a-1 constituting the tooth 906, the rigidity of the tooth 906 is low.

  If the V-caulking 904 is provided only on the core back 905 and the V-caulking 904 is not provided on the teeth 906, a problem may occur during winding. A certain gap is formed between the electromagnetic steel sheets provided with the V-caulking 904. If the caulking 904 is not provided on the teeth 906, the gap between the stacks of the teeth 906 is reduced by the pressure of the winding 903 during winding, and the core width in the stacking direction of the teeth 906 changes before and after the winding. End up. The core width L1 in the stacking direction before winding becomes the core width L2 (L1> L2) in the stacking direction after winding, which causes a problem that sagging occurs in the winding at the start of winding.

  Segment of the present embodiment in which the first electromagnetic steel plate 201a-1 having the V-caulking 204 on the teeth 206 and the second electromagnetic steel plate 201a-2 having no V-caulking 204 on the teeth 206 are alternately stacked two by two. The effect of 201a will be described with reference to FIGS.

  As shown in FIGS. 8 to 10, the segment 201a of the present embodiment includes two types of electromagnetic steel plates (first electromagnetic steel plate 201a-1 and second electromagnetic steel plate 201a-2) alternately in two pieces. They are stacked by caulking 204.

  The first electromagnetic steel plate 201 a-1 includes two V-caulking 204 on the core back 205. Two V caulkings 204 are arranged substantially symmetrically on the left and right (circumferential direction) of the core back 205. Further, the V caulking 204 has a substantially rectangular cross section. The V-caulking 204 of the core back 205 is disposed so that the long side of the rectangle substantially coincides with the circumferential direction. This is because the long side of the rectangle substantially matches the direction of the magnetic flux lines.

  The first electromagnetic steel plate 201 a-1 includes one V caulking 204 on the tooth 206. The V caulking 204 of the tooth 206 is disposed at a substantially central portion of the tooth 206 so that the long side of the rectangle faces in the radial direction. This is because the long side of the rectangle substantially matches the direction of the magnetic flux lines.

  First, two first electromagnetic steel plates 201a-1 are arranged at one end (upper part in FIG. 8) in the stacking direction.

  The second electromagnetic steel plate 201a-2 is also provided with two V-caulking 204 on the core back 205 in the same arrangement as the first electromagnetic steel plate 201a-1.

  The second electromagnetic steel plate 201 a-2 does not have the V caulking 204 of the teeth 206.

  The two second electromagnetic steel plates 201a-2 are connected to the core back 205 following the two first electromagnetic steel plates 201a-1 disposed at one end in the stacking direction (upper part in FIG. 8). Laminated by caulking 204.

  The combination of the two first electromagnetic steel plates 201a-1 and the two second electromagnetic steel plates 201a-2 is repeated to form the segment 201a.

  As shown in FIG. 15, the core width in the stacking direction of the segment 201a before winding is L1. First, the insulating material 202 is applied to the teeth 206 of the segment 201a before winding (integral molding of resin or the insulating material 202 of another part is inserted into the teeth 206). After that, concentrated winding is performed on the insulating material 202 using a magnet wire.

  In the segment 201a of the present embodiment, two first electromagnetic steel plates 201a-1 and two second electromagnetic steel plates 201a-2 are alternately stacked, and two first electromagnetic steel plates 201a-2 are stacked at the end in the stacking direction. Since one electromagnetic steel plate 201a-1 (with teeth 206 having V-caulking 204) is disposed, the teeth 206 are rigid, and even if concentrated windings are wound around the teeth 206, the core width in the stacking direction is reduced. do not do. As shown in FIG. 16, the core width in the stacking direction after winding is not different from the core width L1 in the stacking direction before winding.

  In the segment 201a of the present embodiment, for example, the number of V-caulking 204 of the tooth 206 is half that of the general segment 801a shown in FIG. Therefore, the magnetic properties (magnetic permeability and iron loss density) of the segment 201a are superior to those of the general segment 801a. Further, since the first electromagnetic steel plate 201a-1 having the V caulking 204 partially on the teeth 206 and having the V caulking 204 on the teeth 206 is disposed at the end in the stacking direction, winding (concentrated winding) is performed. Even if applied, the core width in the stacking direction does not change. Therefore, the winding does not loosen.

  In the segment 201a of the present embodiment, the number of caulking of the teeth 206, which has a large deterioration in magnetic properties, is approximately half that of the case where caulking is provided for each electromagnetic steel sheet, and suppresses the deterioration of magnetic properties due to caulking. The loss reduction effect by this is great.

  In particular, since the teeth 206 are provided with the winding 203 after the lamination, the rigidity of the core is improved after the formation of the winding 203, and the joining force at the time of lamination may be sufficient to temporarily fix the electromagnetic steel sheet. Considering the fixing force by the winding 203, the joining force by caulking of the teeth 206 may be smaller than that of the core back 205 in many cases.

  In the teeth 206, a region in which the V caulking 204 is provided in the stacking direction (region of the first electromagnetic steel plate 201a-1 and an area having a caulking portion), and a region in which the V caulking 204 is not provided (second electromagnetic steel plate 201a-2). However, the area where the V-caulking 204 is provided and the area where the V-caulking 204 is not provided are managed in a certain interval in terms of magnetic imbalance. preferable.

  The tooth 206 is provided with a region where the V-caulking 204 is provided in the stacking direction (region of the first electromagnetic steel plate 201a-1) and a region where the V-caulking 204 is not provided (region of the second electromagnetic steel plate 201a-2). However, if the caulking (size and method) of the teeth 206 and the core back 205 is the same, the teeth 206 have insufficient bonding strength and the core width in the stacking direction is likely to shrink compared to the core back 205. It may become.

  In particular, when the windings 203 are applied to the stator 200, an insulating material 202 for insulating the stator core 201 and the windings 203 is attached and wound. Therefore, it is preferable that the core widths in the stacking direction of the core back 205 and the teeth 206 are configured to be the same as much as possible.

  In that case, by providing the teeth 206 with a caulking depth different from that of the core back 205, the joining force of the teeth 206 can be increased with respect to the core back 205, or the laminating gap due to the caulking can be widened to eliminate caulking. The core width with the region can be adjusted.

  In the above-described segment 201a, two first electromagnetic steel plates 201a-1 and two second electromagnetic steel plates 201a-2 are alternately stacked, but the number of each may be arbitrary.

  Moreover, although the above-mentioned segment 201a arrange | positions the 1st electromagnetic steel plate 201a-1 (it is equipped with V caulking 204 in the tooth | gear 206) in the edge part of the lamination direction, the 2nd electromagnetic steel plate 201a-2 ( Teeth 206 may not have V-caulking 204) may be disposed at the end in the stacking direction.

  Next, the segment 501a of Modification 1 will be described with reference to FIG. In the segment 501a of the first modification, the teeth 506 are provided with a caulking method different from the core back 505. Others are the same as the segment 201a of FIG.

  As shown in FIG. 17, in the segment 501a of the first modification, the first electromagnetic steel plate 501a-1 and the second electromagnetic steel plate 501a-2 are combined. In the example of FIG. 17, two first electromagnetic steel plates 501a-1 are arranged at the upper end in the stacking direction of the segments 501a. And the two 2nd electromagnetic steel plates 501a-2 are arrange | positioned under the two 1st electromagnetic steel plates 501a-1. The segment 501a is configured by repeating the combination of the first electromagnetic steel sheet 501a-1 and the second electromagnetic steel sheet 501a-2.

  As shown in FIG. 17, the first electromagnetic steel plate 501 a-1 is provided with a core back 505 with two V-caulking 504 divided into left and right. Further, one round caulking 508 is provided on the teeth 506.

  The two V caulks 504 of the core back 505 in the first electromagnetic steel sheet 501a-1 are arranged so that the longitudinal direction thereof substantially coincides with the circumferential direction.

  As shown in FIG. 17 (see FIG. 17B), in the second electromagnetic steel plate 501a-2, two V-caulking 504 are provided on the core back 505 separately on the left and right. Further, the teeth 506 are not provided with the round caulking 508.

  When the round caulking 508 and the V caulking 504 are compared, the round caulking 508 is superior in terms of magnetic properties, but the V caulking 504 is superior in terms of caulking strength.

  Whichever is to be used, V caulking 504 or round caulking 508, is used for the teeth 506 of the first electromagnetic steel sheet 501a-1.

  Next, the segment 601a of Modification 2 will be described with reference to FIG. The segment 601a of the modified example 2 is provided with the first electromagnetic steel plate 601a-1 (provided with the V-caulking 604 on the teeth 606) at both ends in the stacking direction, and in the meantime, the second electromagnetic steel plate 601a-2 (on the teeth 606) V-caulking 604 is not provided). The first electromagnetic steel plate 601a-1 is not provided except for the plurality of first electromagnetic steel plates 601a-1 at both ends.

  The first electromagnetic steel plate 601 a-1 and the second electromagnetic steel plate 601 a-2 are provided with two V caulking 604 on the left and right in the core back 605.

  In FIG. 18, two first electromagnetic steel plates 601a-1 are provided at the upper end of the segment 601a in the stacking direction, and three first electromagnetic steel plates 601a-1 are provided at the lower end of the segment 601a in the stacking direction. Is provided.

  At least two first electromagnetic steel plates 601a-1 are provided at the upper end of the segment 601a in the stacking direction, and at least two first electromagnetic steel plates 601a-1 are provided at the lower end of the segment 601a in the stacking direction. It is essential.

  The segment 601a of Modification 2 is provided with at least two first electromagnetic steel plates 601a-1 at the upper end in the stacking direction, and at least two first electromagnetic steel plates 601a- at the lower end in the stacking direction of the segment 601a. By providing 1, the rigidity of the teeth 606 of the segment 601a can be ensured.

  Since the segment 601a does not include the first electromagnetic steel plates 601a-1 other than the plurality of first electromagnetic steel plates 601a-1 at both ends, the number of V-caulking 604 in the teeth 606 is reduced. Therefore, deterioration of the magnetic characteristics of the segment 601a can be suppressed.

  Next, the segment 701a of Modification 3 will be described with reference to FIG. The segment 701a of the third modification is obtained by changing the V caulking 604 of the teeth 606 in the first electromagnetic steel plate 601a-1 of the segment 601a of the second modification to a round caulking 708. Other configurations are the same as those of the segment 601a of the second modification. In the case where magnetic characteristics are more important than the rigidity of the teeth 706 of the segment 701a, the segment 701a of Modification 3 using the round caulking 708 as the caulking of the teeth 706 is suitable.

  The present embodiment has an effect of suppressing the core shrinkage of the teeth 206 due to the winding 203 even when the number of caulking of the teeth is reduced. The effect is great.

  Further, the effect is great in an electric motor in which the winding 203 is formed by mechanical winding with a large pressure by the winding 203 during winding.

  In the case where the stator core 201 is configured in a joint wrap method, a stacking gap due to the joint portion of the joint wrap is generated in the core back 205, so this embodiment is effective.

  The joint wrap method is a method in which adjacent core members of adjacent segments 201a are connected by joint portions (which may be connected by pins or may be connected by unevenness).

  In this embodiment, as the magnetic flux density of the stator core 201 is higher, the effect of reducing iron loss and the like is greater, and an electric motor equipped with a rare earth magnet having a high magnetic force provides a greater efficiency improvement effect.

  It is also effective to install the electric motor in an air conditioner compressor (compressor) that requires high efficiency and high torque.

  Examples of applications of the present invention include, for example, a compressor motor for an air conditioner that requires high efficiency and high torque and a motor for an automobile that is required to improve energy saving.

  DESCRIPTION OF SYMBOLS 100 Electric motor, 200 Stator, 201 Stator iron core, 201a segment, 201a-1 1st electromagnetic steel plate, 201a-2 2nd electromagnetic steel plate, 201b Connection part, 202 Insulation material, 203 winding, 204V caulking, 204a Convex part, 204b Concave part, 205 Core back, 206 teeth, 300 Rotor, 301 Rotor core, 302 Permanent magnet, 303 Magnet insertion hole, 304 shaft, 305 Leakage magnetic flux suppression hole, 400 Airtight container, 501a segment, 501a-1 First electromagnetic steel plate, 501a-2 Second electromagnetic steel plate, 504 V caulking, 505 Core back, 506 teeth, 508 Round caulking, 601a segment, 601a-1 First electromagnetic steel plate, 601a-2 Second electromagnetic steel plate , 604 V caulking, 605 core back, 606 tee , 701a segment, 701a-1 first electromagnetic steel plate, 701a-2 second electromagnetic steel plate, 704 V caulking, 705 core back, 706 teeth, 708 round caulking, 801a segment, 801a-1 electromagnetic steel plate, 802 insulating material, 803 winding, 804 V caulking, 805 core back, 806 teeth, 901a segment, 901a-1 electrical steel sheet, 902 insulating material, 903 winding, 904 V caulking, 905 core back, 906 teeth.

Claims (6)

A stator core having a ring-shaped core back and teeth radially formed inward from the core back, which is configured by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape by caulking,
The core back includes a portion to be joined to each electromagnetic steel sheet by caulking in a predetermined shape with a predetermined number of other electromagnetic steel sheets adjacent in the stacking direction,
The teeth include a part to be joined by caulking with another electromagnetic steel sheet adjacent in the stacking direction to some of the electromagnetic steel sheets,
A stator iron core comprising a magnetic steel plate having a portion where the teeth are joined by caulking and a magnetic steel plate not having a portion where the teeth are joined by caulking, which are alternately laminated by a predetermined number.   The stator core according to claim 1, wherein the stator core is divided into segments and each segment is connected by a joint wrap method.   A stator having concentrated windings applied to the stator core according to claim 1 or 2.   The stator according to claim 3, wherein the winding is performed by mechanical winding.   An electric motor comprising the stator according to claim 3 and a rotor having a rare earth magnet.   A compressor having the electric motor according to claim 5 mounted thereon.

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