JPWO2018138864A1 - Stator, motor, compressor, and refrigeration air conditioner - Google Patents

Abstract

  The stator (100) includes a first core (10A) made of a magnetic steel sheet and a second core (10B) made of an amorphous metal or a nanocrystal metal. The first iron core (10A) extends from the first yoke (12A) toward the axis (C1) from the first yoke (12A) extending in the circumferential direction centered on the axis (C1) It has a first tooth (11A) and a second tooth (11A). The second iron core (10B) comprises a second yoke (12B) adjacent to the first yoke (12B) in the direction of the axis (C1), a first tooth (11A) and a second tooth (12B). 11A) have third teeth (11B) and fourth teeth (11B) adjacent in the direction of the axis (C1). The first iron core (10A) is divided at the first yoke (12A) by the dividing surface formed between the first teeth (11A) and the second teeth (11A), and the outer periphery is more than the dividing surface It is integrally formed by the side. The distance (r2) from the axis (C1) to the outer peripheral surface (16B) of the second yoke (12B) is smaller than the distance from the axis (C1) to the outer peripheral surface (16A) of the first yoke (12A) .

Description

  The present invention relates to a stator, an electric motor, a compressor, and a refrigeration air conditioner.

  In order to reduce the core loss of the motor, one in which a part of the stator core is formed of a laminate of iron core pieces of amorphous metal or nanocrystal metal is developed (see, for example, Patent Document 1). In addition, a stator core of a motor, which is formed of a stack of sheets of low loss magnetic material, has also been developed (see, for example, Patent Document 2).

JP, 2014-155347, A (refer to paragraphs 0014-0016) Japanese Patent Application Publication No. 2013-546301 (refer to paragraph 0005)

  Constituting the stator core with amorphous metal or nanocrystal metal is effective in reducing core loss. However, since amorphous metal and nanocrystal metal have a large increase in magnetic resistance when subjected to compressive stress, when the stator core is incorporated into the inside of the frame by shrink fitting or the like, the magnetic resistance is affected by compressive stress. It may increase and lead to an increase in iron loss.

  The present invention was made in order to solve the above-mentioned subject, and it aims at providing a stator which can reduce iron loss more effectively.

  A stator according to the present invention has a first yoke circumferentially extending about an axis, and first and second teeth extending from the first yoke toward the axis. A first core made of a magnetic steel sheet, a second yoke adjacent to the first yoke in the axial direction, and a first tooth and a first adjacent to the second teeth in the axial direction And a second iron core composed of an amorphous metal or a nanocrystalline metal, having three teeth and a fourth tooth. The first iron core is divided at a dividing surface formed between the first teeth and the second teeth in the first yoke, and is connected on the outer peripheral surface side of the first yoke. The distance from the axis to the outer peripheral surface of the second yoke is smaller than the distance from the axis to the outer peripheral surface of the first yoke.

  According to the present invention, since the second iron core is made of amorphous metal or nanocrystal metal, iron loss can be reduced. Further, since the first iron core is divided at the division plane and connected on the outer peripheral side of the first yoke, when winding each tooth, both sides of the division plane of the first yoke are interposed. By rotating the portion at the connecting portion, the distance between the first teeth and the second teeth can be increased, and the winding operation can be simplified. Further, since the distance from the axis to the outer peripheral surface of the second yoke is smaller than the distance from the axis to the outer peripheral surface of the first yoke, the external force from the frame is It can be received with 1 iron core (magnetic steel sheet). Therefore, the increase in the magnetic resistance of the second iron core can be suppressed, and the iron loss reduction effect can be enhanced.

FIG. 1 is a cross-sectional view showing a motor according to Embodiment 1. FIG. 3 is a view showing a stator core, an insulator and a winding of the motor in the first embodiment. FIG. 1 is a cross-sectional view showing a motor according to Embodiment 1. FIG. 5 is a plan view showing a first iron core in the first embodiment. FIG. 2 is a view showing a first divided core portion (A) and a second divided core portion (B) in the first embodiment. FIG. 7 is a plan view showing a second iron core in the first embodiment. FIG. 5 is a diagram showing the first divided core portion and the second divided core portion in Embodiment 1 superimposed on each other. FIG. 5 is a diagram showing a first iron core and a second iron core in Embodiment 1 superimposed on each other. FIG. 5 is a plan view showing an electromagnetic steel sheet for forming a first iron core in the first embodiment. FIG. 7 is a diagram showing a state in which the first iron core in Embodiment 1 is developed in a band shape. FIG. 6 is a plan view showing a magnetic steel sheet for forming a second iron core in the first embodiment. It is a schematic diagram (A), (B) for demonstrating the winding process in Embodiment 1. FIG. FIG. 2 is a plan view showing an electromagnetic steel sheet for forming a rotor core in Embodiment 1. FIG. 7 is a cross-sectional view for illustrating the function of the motor in the first embodiment. FIG. 10 is a cross-sectional view showing a motor of a first modified example of the first embodiment. FIG. 10 is a cross-sectional view showing a motor of a second modified example of the first embodiment. FIG. 18 is a plan view showing a first iron core of a third modification of the first embodiment. It is sectional drawing which shows the structure of the rotary compressor which can apply the electric motor of Embodiment 1 and each modification. It is a figure which shows the structure of the refrigerating air conditioner provided with the rotary compressor of FIG.

Embodiment 1
<Configuration of motor>
A motor 100 according to a first embodiment of the present invention will be described. FIG. 1 is a cross-sectional view showing the configuration of motor 100 according to the first embodiment of the present invention. The motor 100 is a permanent magnet embedded motor in which permanent magnets 25 are embedded in a rotor 2 and is used, for example, in a rotary compressor 500 (see FIG. 18).

  The electric motor 100 is an electric motor called an inner rotor type, and has a stator 1 and a rotor 2 rotatably provided inside the stator 1. An air gap of, for example, 0.3 to 1.0 mm is formed between the stator 1 and the rotor 2. FIG. 1 is a cross-sectional view in a plane orthogonal to the rotation axis (axis line C1) of the rotor 2.

  Hereinafter, the direction of the axis C1 which is the rotation axis of the rotor 2 will be simply referred to as "axial direction". Also. The circumferential direction about the axis C1 is simply referred to as "circumferential direction". Moreover, the radial direction of the stator 1 and the rotor 2 centering on the axis line C1 is only called "radial direction." In the other figures, the arrow C1 indicates the axial direction, and the arrow R1 indicates the circumferential direction.

  The stator 1 has a stator core 10 and windings 3 wound around the stator core 10. The stator core 10 has a first core 10A and a second core 10B (FIG. 3), which will be described later.

  The stator core 10 has an annular yoke 12 centered on the axis C1 and a plurality of teeth 11 extending radially inward from the yoke 12 (that is, in the direction toward the axis C1). The teeth 11 have teeth tip portions 13 facing the outer peripheral surface of the rotor 2. The tooth tip 13 is formed to be wider (in the circumferential direction) than the other portions of the teeth 11. That is, the tooth tip 13 has protrusions 14 protruding in the circumferential direction on both sides in the circumferential direction.

  Here, nine teeth 11 are arranged at regular intervals in the circumferential direction, but the number of teeth 11 may be two or more. Between the teeth 11 adjacent in the circumferential direction, a slot, which is a space in which the winding 3 is disposed, is formed.

  The stator core 10 has a configuration in which a plurality of (here, nine) split cores 5 are circumferentially connected to each tooth 11. The divided cores 5 are connected to each other by a connecting portion 15 provided at the outer peripheral end of the yoke 12. The connection part 15 is formed of, for example, a circular caulking part.

  The winding 3 for generating a rotating magnetic field is, for example, a magnet wire wound around the teeth 11 via an insulator 30 (FIG. 2) which is an insulating portion. The number of turns and the diameter (wire diameter) of the winding 3 are determined in accordance with the required characteristics (number of revolutions, torque, etc.), the applied voltage and the cross-sectional area of the slot. The winding 3 is wound by concentrated winding and connected by Y connection.

  FIG. 2 is a view showing the stator core 10 (split core 5), the insulator 30, and the winding 3. As shown in FIG. The insulator 30 is formed on the outer peripheral surface of the peripheral wall 31 formed on both side surfaces 111 in the circumferential direction of the tooth 11, the outer wall 32 formed on the inner peripheral surface 121 of the yoke 12, and the protrusion 14 of the tooth 11. And the inner wall portion 33.

  The winding 3 is disposed in a region surrounded by the peripheral wall portion 31, the outer wall portion 32 and the inner wall portion 33. Further, the peripheral wall portion 31 of the insulator 30 is also formed on both end surfaces in the axial direction of the teeth 11 (see FIG. 3). A magnet wire of, for example, 1.0 mm in diameter is wound 80 turns around each tooth 11 via the insulator 30 to constitute the winding 3.

  Returning to FIG. 1, the rotor 2 has a cylindrical rotor core 21, a permanent magnet 25 attached to the rotor core 21, and a shaft 60 disposed in the central portion of the rotor core 21. The shaft 60 is, for example, a shaft of a rotary compressor 500 (FIG. 18). The rotor core 21 is formed by laminating a plurality of electromagnetic steel plates in the axial direction, and fastening both ends in the axial direction with fixing members 41 and 42 (FIG. 3).

  The thickness tr of the magnetic steel sheet constituting the rotor core 21 is, for example, 0.35 to 0.5 mm, and the thickness t1 (0.25 to 0) of the magnetic steel sheet of the first iron core 10A (FIG. 3) described later. It is desirable that it is more than .35 mm).

  Along the outer peripheral surface of the rotor core 21, a plurality of (here, six) magnet insertion holes 22 into which the permanent magnets 25 are inserted are formed. The magnet insertion hole 22 is a through hole which penetrates the rotor core 21 in the axial direction. The number of magnet insertion holes 22 (i.e., the number of magnetic poles) is not limited to six, and may be two or more. Between the magnet insertion holes 22 adjacent to each other is a gap between the poles.

  The permanent magnet 25 is a flat plate member which is long in the axial direction, has a width in the circumferential direction of the rotor core 21, and has a thickness in the radial direction. The thickness of the permanent magnet 25 is, for example, 2 mm. The permanent magnet 25 is made of, for example, a rare earth magnet having neodymium (Nd), iron (Fe) and boron (B) as main components. The permanent magnet 25 is magnetized in the thickness direction.

  Here, one permanent magnet 25 is disposed in one magnet insertion hole 22. However, a plurality of permanent magnets 25 may be arranged in the circumferential direction in one magnet insertion hole 22. In this case, the plurality of permanent magnets 25 in the same magnet insertion hole 22 are magnetized such that the same poles face radially outward.

  Flux barriers (leakage flux suppression holes) 23 are formed at both end portions of the magnet insertion hole 22 in the circumferential direction. The flux barrier 23 suppresses the leakage flux between the adjacent permanent magnets 25. The core portion between the flux barrier 23 and the outer periphery of the rotor core 21 is a thin portion in order to suppress the short circuit of the magnetic flux between the adjacent permanent magnets 25. It is desirable that the thickness of the thin portion be the same as the thickness of the magnetic steel sheet constituting the rotor core 21.

  FIG. 3 is a cross-sectional view showing a configuration of motor 100, in a plane including axis C1. The stator core 10 has a first core 10A composed of a stack of electromagnetic steel sheets and a second core 10B composed of amorphous metal or nanocrystal metal. The first iron cores 10A and the second iron cores 10B are alternately arranged in the axial direction (direction of the axis C1). In particular, the first iron core 10A is disposed at at least both axial end portions of the stator core 10.

  Here, the first iron cores 10A are respectively disposed on both sides and in the center of the stator core 10 in the axial direction. And the 2nd iron core 10B is arrange | positioned so that it may be pinched | interposed into 1st iron core 10A adjacent to an axial direction.

  Let L1 be the thickness (axial length) of the first iron core 10A disposed at one axial end (upper end in FIG. 3) of the stator core 10, and the thickness of the second iron core 10B adjacent thereto. Let L be L2. The thickness of the first iron core 10A disposed at the axial center of the stator core 10 is L3, and the thickness of the second iron core 10B adjacent thereto is L4, and the other axial end of the stator iron core 10 is The thickness of the first iron core 10A disposed at (the lower end in FIG. 3) is L5.

  The total thickness (= L1 + L3 + L5) of the first iron core 10A is smaller than the total thickness (= L2 + L4) of the second iron core 10B. This is to facilitate the flow of the magnetic flux from the permanent magnet 25 of the rotor 2 to the second core 10B. Here, although the sum L0 of the thickness of the first iron core 10A and the thickness of the second iron core 10B is the same as the axial length L6 of the rotor iron core 21 here, it is not necessary to be necessarily the same ( See FIG. 16 described later).

  Of the stator core 10, the first core 10A protrudes radially outward with respect to the second core 10B. The first core 10A is incorporated inside the cylindrical frame 6 of the motor 100 by shrink fitting, press fitting, welding or the like. The frame 6 is, for example, a part of the closed container of the rotary compressor 500 (FIG. 18).

  FIG. 4 is a plan view showing the first iron core 10A. The first iron core 10A is formed of a laminate in which electromagnetic steel sheets having a thickness (t1) of 0.25 to 0.35 mm are axially stacked. As a magnetic steel sheet, although a non-oriented magnetic steel sheet is used, for example, it is not limited to this.

  The first iron core 10A has a yoke 12A extending in the circumferential direction and a plurality of (here, nine) teeth 11A extending inward in the radial direction from the yoke 12A. The yoke 12A has an outer circumferential surface 16A that abuts on the inner circumferential surface of the frame 6 (FIG. 3).

  Of the first iron core 10A, a portion corresponding to the split core 5 (a portion including one tooth 11A) is referred to as a first split iron core portion 5A. That is, the first iron core 10A is divided into a plurality of (here, nine) first divided iron core portions 5A in the circumferential direction.

  A connecting portion 15 formed of, for example, a circular caulking portion is formed at the outer peripheral end of the yoke 12A. The connection part 15 is arrange | positioned at the one end part of the circumferential direction of each 1st division | segmentation iron core part 5A. The connection part 15 is a part which mutually connects the 1st division | segmentation iron core part 5A which adjoins the circumferential direction mutually.

  With this configuration, the plurality of first divided core portions 5A that constitute the first iron core 10A are rotatably coupled about the coupling portion 15. That is, the first iron core 10A can be developed in a band shape (see FIG. 10) and combined in an annular shape. In addition, although the connection part 15 is not limited to a crimping part and may be a thin part, this is mentioned later.

  FIG. 5A is a plan view showing a first divided core portion 5A (first core 10A). In the first divided core portion 5A, the circumferential central portion of the yoke 12A is continuous with the teeth 11A. A tooth tip 13A that faces the outer peripheral surface of the rotor 2 is formed on the radially inner side of the teeth 11A. The tooth tip 13A is wider than the other portions of the tooth 11A, and has protrusions 14A on both sides in the circumferential direction.

  Further, in the first divided core portion 5A, the yoke 12A has an end face 17A forming one end in the circumferential direction and an end face 18A forming the other end in the circumferential direction. The connecting portion 15 is formed between the outer peripheral surface 16A and the end surface 18A. The end faces 17A and 18A correspond to divided surfaces.

  When the first iron core 10A is combined in an annular shape as shown in FIG. 4, the end faces 17A and 18A of the yoke 12A of the first divided core portion 5A are respectively adjacent to the first divided core portion 5A adjacent in the circumferential direction. It abuts on the end faces 18A and 17A of the yoke 12A.

  A recess (notched portion) 19 is formed on the outer peripheral surface 16A of the yoke 12A. The recess 19 is a portion for chucking the stator 1 with a jig in a winding process (FIG. 12) described later.

  A crimped portion (teeth crimped portion) 101 is formed at the radial center of the teeth 11A. Crimping portions (yoke caulking portions) 102 and 103 are formed on both sides in the circumferential direction of the recess 19 of the yoke 12A.

  The crimped portions 101 of the teeth 11 and the crimped portions 102 and 103 of the yoke 12 fix the electromagnetic steel plates adjacent in the axial direction to each other. By fixing the electromagnetic steel plates with the crimped portions 101 of the teeth 11 and the crimped portions 102 and 103 of the yoke 12, high dimensional accuracy and high rigidity of the first core 10A (the teeth 11A and the yoke 12A) can be obtained.

  The caulking portion 101 is not limited to the central portion of the teeth 11A, and may be provided, for example, at both circumferential end portions of the tooth tip 13 or at the circumferential center portion of the tooth tip 13.

  FIG. 6 is a plan view showing the configuration of the second iron core 10B. The second core 10B is made of amorphous metal or nanocrystal metal. The second iron core 10B is formed of a laminate in which thin strips having a thickness of 0.02 mm to 0.05 mm are axially stacked, or a compact obtained by compression molding of powder. The second core 10B is fixed to the first core 10A (FIG. 4) by an adhesive or resin.

  When laminating ribbons of amorphous metal or nanocrystalline metal, it is difficult to fix them by caulking like electromagnetic steel sheet, so by supplying an adhesive between the ribbons to be laminated, plural ribbons are attached to each other. Fix it. In this case, since the adhesive intervenes between the laminated ribbons, the effect of suppressing the eddy current loss can also be obtained.

  When the second iron core 10B is formed of a laminate of amorphous metal ribbons, the second iron core 10B may be annealed in order to remove the strain generated at the time of molding and to improve the magnetic properties.

  The second iron core 10B has a yoke 12B extending in the circumferential direction, and a plurality of (here, nine) teeth 11B extending inward in the radial direction from the yoke 12B. The yoke 12B has an outer circumferential surface 16B opposite to the inner circumferential surface of the frame 6 (FIG. 3).

  Of the second iron core 10B, a portion corresponding to the split core 5 (a portion including one tooth 11B) is referred to as a second split iron core portion 5B. That is, the second iron core 10B is divided into a plurality of (here, nine) second divided iron core portions 5B in the circumferential direction. An air gap G is formed between the second divided core portions 5B adjacent in the circumferential direction.

  FIG. 5 (B) is a plan view showing a second divided core portion 5B (second core 10B). In the second split core portion 5B, the circumferential central portion of the yoke 12B is continuous with the teeth 11B. A tooth tip 13B facing the outer peripheral surface of the rotor 2 is formed on the radially inner side of the teeth 11B. The tooth tip portion 13B is wider than the other portions of the tooth 11B, and has protrusions 14B on both sides in the circumferential direction.

  Further, in the second core segment 5B, the yoke 12B has an end face 17B forming one end in the circumferential direction and an end face 18B forming the other end in the circumferential direction. The crimped portions 101, 102, and 103 (FIG. 4A) of the first iron core 10A are not provided in the teeth 11B and the yoke 12B of the second iron core 10B.

  FIG. 7 is a view showing the first divided core portion 5A and the second divided core portion 5B in an overlapping manner. The outer peripheral surface 16B of the yoke 12B is located radially inward of the outer peripheral surface 16A of the yoke 12A. Further, the end faces 17B and 18B of the yoke 12B in the second split core portion 5B are respectively located inward in the circumferential direction than the end faces 17A and 18A of the yoke 12A in the first split core portion 5A.

  The yokes 12A and 12B have the same outline shape except for the outer peripheral surfaces 16A and 16B and both end surfaces 17A, 18A, 17B and 18B in the circumferential direction. The teeth 11A and 11B have the same contour shape as each other.

  FIG. 8 is a diagram showing the positional relationship between the first iron core 10A and the second iron core 10B. As described above, the outer peripheral surface 16B of the yoke 12B is located radially inward with respect to the outer peripheral surface 16A of the yoke 12A. In other words, the distance r2 from the axis C1 to the outer peripheral surface 16B of the yoke 12B is smaller than the distance r1 from the axis C1 to the outer peripheral surface 16A of the yoke 12A.

  Therefore, the outer peripheral surface 16A of the yoke 12A abuts on the frame 6, but the outer peripheral surface 16B of the yoke 12B is separated from the frame 6. Therefore, although the external force from the flame | frame 6 acts on 1st iron core 10A, the external force from the flame | frame 6 does not act on 2nd iron core 10B.

  Further, the end faces 17B and 18B (FIG. 5B) of the yoke 12B in the second split core portion 5B are more than the end faces 17A and 18A (FIG. 5A) of the yoke 12A in the first split core portion 5A. Each is located inside in the circumferential direction. Therefore, a gap G (FIG. 6) is formed between the second divided core portions 5B adjacent in the circumferential direction. Therefore, external force from the adjacent second divided core portion 5B does not act on the second divided core portion 5B.

  Here, the yoke 12A of the first iron core 10A is referred to as "first yoke", and the yoke 12B of the second iron core 10B is referred to as "second yoke". Further, among the nine teeth 11A of the first iron core 10A, one tooth is referred to as "first tooth", and the tooth 11A adjacent thereto is referred to as "second tooth". Similarly, among the nine teeth 11B of the second iron core 10B, the tooth 11B axially adjacent to the first tooth is referred to as "third tooth", and is axially relative to the second tooth. The adjacent teeth 11B are referred to as "fourth teeth".

  In this case, the first iron core 10A is a divided surface (17A, 18A) formed between adjacent teeth 11A (ie, between the first teeth and the second teeth) in the yoke 12A (first yoke). It can be said that it is divided by).

  On the other hand, second iron core 10B is divided through gap G formed between adjacent teeth 11B (ie, between the third and fourth teeth) in yoke 12B (second yoke). It can be said that

<Manufacturing process of motor>
Next, the manufacturing process of the motor 100 will be described. FIG. 9 is a plan view showing the electromagnetic steel sheet 50 for forming the first iron core 10A. First, a plurality of steel plate portions 51 having a shape having teeth 11A and yokes 12A are punched out of the electromagnetic steel plate 50.

  Here, a plurality of rows of nine steel plate portions 51 are punched out of the electromagnetic steel plate 50. Further, the directions of the teeth 11A in the two adjacent rows are opposite to each other, and between the teeth 11A adjacent in one of the rows (for example, the row indicated by the symbol A1), the other rows (for example, the rows indicated by the symbol A2) Arrange teeth 11A. Thereby, more steel plate portions 51 can be punched from the magnetic steel plate 50.

  Next, a plurality of steel plate portions 51 punched out of the magnetic steel plate 50 are stacked in the axial direction, and fixed by caulking portions 101, 102 and 103, thereby the first divided core portion 5A shown in FIG. Form. Then, as shown in FIG. 10, the plurality of first divided core portions 5A are arranged in a band shape, and are connected to each other by the connecting portion 15, thereby forming the first core 10A.

  FIG. 11 is a plan view showing a ribbon 52 of amorphous metal or nanocrystal metal for forming the second iron core 10B. A plurality of ribbon portions 53 having a shape having teeth 11B and yokes 12B are punched out of the ribbon 52 of amorphous metal or nanocrystal metal.

  Here, two rows of a plurality of ribbon portions 53 are punched out of the ribbon 52. Further, the directions of the teeth 11A in the two adjacent rows are opposite to each other, and the teeth 11B in the other row are arranged between the teeth 11B adjacent in one row. Thereby, more ribbon parts 53 can be punched from the ribbon 52.

  Next, a plurality of thin strip portions 53 punched out of the thin strip 52 are stacked in the axial direction and fixed to each other by adhesion to form the second divided core portions 5B shown in FIG. 5 (B). Then, the plurality of second divided core portions 5B are fixed to the first divided core portions 5A (FIG. 10) of the first iron core 10A. Thus, the stator core 10 in which the divided cores 5 are arranged in a band shape is formed.

  Next, the insulator 30 (FIG. 2) is formed on the stator core 10. The insulator 30 may be formed integrally with the stator core 10 by, for example, setting the stator core 10 in a mold and filling the resin, or the resin molded body formed in advance may be used as the stator core 10 It may be fitted in and formed.

  After forming the insulator 30 on the stator core 10, winding is performed. 12 (A) and 12 (B) are schematic diagrams for explaining a winding process. First, as shown in FIG. 12 (B), among the stator iron cores 10 in which a plurality of divided cores 5 are arranged in a band shape, the divided cores 5 to be wound are fixed at a winding position with a jig. The split core 5 is rotated about the connection portion 15 so that the distance between the adjacent teeth 11 is increased. Thus, a wide space is formed around the teeth 11 to be wound.

  In this state, the winding 3 is wound around the teeth 11 of the split core 5 fixed at the winding position using the winding nozzle 7 of the winding device. The winding nozzle 7 rotates around the teeth 11 as shown by the arrow R2 in FIG. 12B, and winds the winding 3 around the teeth 11.

  After winding the windings 3 around the teeth 11, as shown in FIG. 12A, the stator core 10 is assembled in an annular shape. At this time, butt parts (indicated by reference numeral W in FIG. 1) of the split cores 5 at both ends of the stator core 10 are butt-welded to each other.

  Thereby, the stator 1 provided with the stator core 10, the insulator 30, and the winding 3 is completed. Thereafter, the stator 1 is incorporated inside the frame 6 by shrink fitting, press fitting, or welding. As described above, in the stator core 10, the first core 10A abuts on the frame 6, but the second iron core 10B does not abut on the frame 6.

  FIG. 13 is a view showing the electromagnetic steel sheet 54 for forming the rotor core 21. As shown in FIG. A steel plate portion 55 having a shape of a rotor core 21 having a magnet insertion hole 22, a flux barrier 23, and a central hole 26 is punched out of the electromagnetic steel plate 54 shown in FIG. Next, a plurality of steel plate portions 55 punched out of the magnetic steel plate 54 are stacked in the axial direction, and fixed from both sides in the axial direction by the fixing members 41 and 42 (FIG. 3), whereby the rotor core 21 shown in FIG. Form.

  Further, the permanent magnet 25 is inserted into the magnet insertion hole 22 of the rotor core 21, and the shaft 60 is inserted into the central hole 26 to form the rotor 2. Thereafter, the rotor 2 is inserted inside the stator 1 mounted in the frame 6. Thereby, the motor 100 shown in FIG. 1 is completed.

  The first iron core 10A, the second iron core 10B and the rotor iron core 21 are formed in separate steps as shown in FIG. 9, FIG. 11 and FIG. Therefore, a high material yield can be obtained, and the manufacturing cost of the motor 100 can be suppressed.

<Function of stator>
FIG. 14 is a cross-sectional view for explaining the operation of the stator 1 of this embodiment. As described above, among the stator iron cores 10, the first iron cores 10A made of electromagnetic steel sheets are fixed to the inside of the frame 6 by shrink fitting, press fitting, welding or the like. On the other hand, the second core 10 B made of amorphous metal or nanocrystal metal is separated from the frame 6.

  The stator core 10 (the first core 10A and the second core 10B) is opposed to the outer peripheral surface of the rotor 2. The magnetic flux from the permanent magnet 25 of the rotor 2 flows from the tooth tip 13 (FIG. 3) into the teeth 11 and flows radially outward in the teeth 11. The magnetic flux flowing in the teeth 11 flows into the yoke 12 and further flows in the circumferential direction in the yoke 12. Thus, a path (magnetic path) of magnetic flux passing through the teeth 11 and the yoke 12 is formed, and the action of the magnetic flux and the current flowing through the winding 3 generates a torque for rotating the rotor 2.

  Here, although the second iron core 10B is composed of amorphous metal or nanocrystal metal, the atom of amorphous metal is amorphous and has no directivity, and the crystal grain of nanocrystal metal is miniaturized to the order of 10 μm. Both have excellent magnetic properties and low magnetic resistance. Therefore, the iron loss in the teeth 11 is reduced by a large amount of magnetic flux from the permanent magnets 25 of the rotor 2 flowing to the teeth 11B.

  In addition, although the electromagnetic steel sheet constituting the first iron core 10A is not as remarkable as the amorphous metal, it has a property that the magnetic resistance increases when subjected to the compressive stress. Therefore, when the compressive stress from the frame 6 is applied to the first iron core 10A, the magnetic flux from the permanent magnet 25 of the rotor 2 does not easily flow to the teeth 11A of the first iron core 10A. As a result, the magnetic flux flowing to the teeth 11B of the second iron core 10B made of amorphous metal or nanocrystal metal (therefore, the magnetic resistance is small) can be increased, and iron loss in the teeth 11 can be further reduced.

  Further, since the total thickness of the first iron core 10A (L1 + L3 + L5 shown in FIG. 3) is smaller than the total thickness (L2 + L4) of the second iron core 10B, the area of the teeth 11A facing the rotor 2 The area in which the teeth 11B face the rotor 2 is larger than that of the teeth 11B. Therefore, the magnetic flux from the permanent magnet 25 of the rotor 2 flows more easily to the teeth 11B than the teeth 11A, and iron loss in the teeth 11 can be further reduced.

  Further, since the magnetic flux having flowed through the teeth 11B flows into the yoke 12B on the outer peripheral side, most of the magnetic flux from the permanent magnets 25 of the rotor 2 flows to the yoke 12B rather than the yoke 12A. Therefore, similarly to the teeth 11, the iron loss in the yoke 12 can also be reduced.

  The amorphous metal or nanocrystal metal constituting the second iron core 10B has a remarkable reduction in magnetic resistance when subjected to compressive stress than the electromagnetic steel sheet. However, since the second iron core 10B has an outer diameter smaller than that of the first iron core 10A and does not abut on the frame 6, the compressive stress applied to the second iron core 10B can be suppressed. Therefore, the increase in the magnetic resistance of the second iron core 10B can be suppressed.

  When the second iron core 10B is formed of a compact of an amorphous metal powder, there is a possibility that the mechanical strength of the second iron core 10B may be reduced. In the first embodiment, the second iron core 10B may be used. Since the iron core 10B does not abut on the frame 6, damage to the second iron core 10B can be suppressed.

<Effect of the embodiment>
As described above, according to the first embodiment of the present invention, the stator core 10 includes the first core 10A made of a magnetic steel sheet and the second core made of an amorphous metal or a nanocrystal metal. 10B are arranged in the axial direction. Therefore, the magnetic flux of the rotor 2 can more easily flow to the second iron core 10B than the first iron core 10A, and iron loss can be reduced.

  In addition, although the amorphous metal and the nanocrystal metal have the property that the magnetoresistance increases when subjected to compressive stress, the outer diameter of the second iron core 10B is smaller than the outer diameter of the first iron core 10A. When 10 is incorporated into the frame 6, an external force from the frame 6 can be received by the first iron core 10A. Therefore, the increase in the magnetic resistance of the second iron core 10B can be suppressed, and the iron loss can be effectively reduced.

  Further, the first iron core 10A is divided into a plurality of parts by the dividing surfaces (17A, 18A) formed between the adjacent teeth 11A, and is connected at the end on the outer peripheral surface side of the yoke 12A. Therefore, in the winding process, the split core 5 can be rotated about the connection portion 15 to form a wide space around the teeth 11, and the winding process can be simplified. In addition, high-density windings can be made with respect to the cross-sectional area of the slot, and a highly efficient motor 100 can be obtained.

  Further, since the connecting portion 15 is formed of a circular caulking portion, the plurality of first divided core portions 5A of the first core 10A can be rotatably connected with a simple configuration.

  In addition, since the first iron core 10A is disposed at both axial end portions and the central portion of the stator core 10, sufficient strength of the stator core 10 can be obtained.

  Further, since the second iron core 10B is divided in the circumferential direction with the gap G formed between the adjacent teeth 11B, an external force does not act between the adjacent second divided core portions 5B. Therefore, the increase in the magnetic resistance of the second iron core 10B can be suppressed.

  In addition, since the axial length (total thickness) of the first iron core 10A is smaller than the axial length of the second iron core 10B, the teeth 11A are closer to the rotor 2 than the area in which the teeth 2 are opposed. The area of 11 B facing the rotor 2 is larger. As a result, the magnetic flux from the permanent magnets 25 of the rotor 2 can easily flow to the second iron core 10B of the stator iron core 10, and iron loss can be effectively reduced.

  Moreover, since 2nd iron core 10B is comprised by the laminated body which laminated | stacked the some ribbon, or the compression molding body of powder, manufacture of 2nd iron core 10B becomes easy. Further, by interposing the adhesive between the plurality of ribbons, the second iron cores 10B can be firmly integrated, and the eddy current loss can be reduced. In addition, by annealing the laminate of amorphous metal ribbons, it is possible to remove the strain generated at the time of molding and to improve the magnetic characteristics.

  Also, the thickness t1 of each of the electromagnetic steel plates constituting the first iron core 10A, the thickness t2 of each of the thin strips constituting the second iron core 10B, and the thickness tr of each of the electromagnetic steel plates constituting the rotor core 21 The following effects can be obtained by satisfying t2 <t1 ≦ tr.

  That is, by forming the rotor core 21 which is small in magnetic flux change and hard to generate iron loss from the electromagnetic steel sheet of the stator core 10 and the electromagnetic steel sheet thicker than the ribbon, the manufacturing cost of the rotor core 21 is reduced. can do. Further, the influence of plastic deformation due to pressing of the rotor core 21 is alleviated, and the strength is improved, so that high-speed driving is possible. In addition, the ribbon constituting the second iron core 10B in which the magnetic flux from the permanent magnet 25 easily flows is made thinner than the electromagnetic steel sheet constituting the first iron core 10A in which the magnetic flux from the permanent magnet 25 hardly flows. Iron loss in the iron core 10 can be reduced, and a motor 100 with high efficiency can be obtained.

First Modified Example
FIG. 15 is a cross sectional view showing a configuration of a motor of a first modified example of the first embodiment. The stator core 10 of the first embodiment has the first iron core 10A at both ends and in the center in the axial direction (FIG. 3). On the other hand, the stator core 10 of the first modification has the first iron core 10A only at both ends in the axial direction. The second iron core 10B is disposed between the two first iron cores 10A.

  Assuming that the thickness of the first core 10A of the stator core 10 is L11 and L13, and the thickness of the rotor core 21 is L12, the total thickness (L11 + L13) of the first core 10A is the second It is smaller than the thickness (L12) of iron core 10B. That is, the magnetic flux from the permanent magnet 25 of the rotor 2 easily flows to the second iron core 10B.

  In this first modified example, since the portions excluding both axial end portions of stator core 10 are formed of second iron core 10B, the magnetic flux from permanent magnet 25 of rotor 2 is second iron core 10B. Easy to flow. Therefore, iron loss can be reduced more effectively. In addition, since the first iron cores 10A are disposed at both axial end portions of the stator core 10, sufficient strength of the stator iron core 10 can be obtained.

Second modified example.
FIG. 16 is a cross-sectional view showing a configuration of a motor of a second modified example of the first embodiment. In Embodiment 1, the axial length of the stator core 10 is the same as the axial length of the rotor core 21 (FIG. 3). On the other hand, in the second modification, the axial length of the stator core 10 is longer than the axial length of the rotor core 21.

  That is, in the second modification, the first iron cores 10A at both axial ends of the stator iron core 10 are disposed axially outward of the axial both ends of the rotor core 21. Therefore, the area in which the rotor core 21 and the second core 10B face each other is larger than that in the first embodiment. The point that the total thickness of the first iron core 10A is smaller than the total thickness of the second iron core 10B is the same as that of the first embodiment.

  Although FIG. 16 shows an example in which the second iron core 10B is formed of a compact obtained by compression molding powder of amorphous metal or nanocrystal metal, a laminate of ribbons of amorphous metal or nanocrystal metal is shown. It may consist of

  In the second modification, since the first iron cores 10A at both axial ends of the stator iron core 10 are disposed axially outside of the axial both ends of the rotor core 21, the rotor iron core 21 is formed. And the facing area of the second iron core 10B can be increased. Therefore, the magnetic flux from the permanent magnet 25 of the rotor 2 can easily flow to the second iron core 10B, and iron loss can be reduced more effectively.

  In FIG. 16, the first iron core 10A is provided at both axial end portions and the central portion of the stator core 10. However, as in the second modification (FIG. 15), the axial direction of the stator core 10 is The first iron core 10A may be provided only at both ends.

Third Modified Example
FIG. 17 is a cross-sectional view showing a configuration of a motor of a third modification of the first embodiment. In the first embodiment, the connecting portion 15 connecting the plurality of first divided core portions 5A of the first iron core 10A is formed of a circular caulking portion (FIG. 6). On the other hand, in the third modification, the connecting portion 8 connecting the plurality of first divided core portions 5A of the first iron core 10A is formed of a thin portion.

  Specifically, in the first iron core 10A, dividing surfaces 81 are formed at both circumferential end portions of the yoke 12A of each of the first divided core portions 5A. The dividing surface 81 extends radially outward from the inner circumferential surface of the yoke 12A toward the outer circumferential surface 16A, but does not reach the outer circumferential surface 16A. A hole 80 is formed at the end (that is, the radially outer end) of the dividing surface 81.

  The thin-walled portion between the hole 80 of the yoke 12A and the outer circumferential surface 16A is a portion that can be plastically deformed, and this thin-walled portion constitutes the connecting portion 8. The connecting portion 8 rotatably supports the first core segment 5A by plastic deformation. The second iron core 10B is configured in the same manner as the first embodiment (FIG. 6), and is fixed to the first iron core 10A by adhesion or the like.

  In the third modification, since the plurality of first divided core portions 5A of the first iron core 10A are integrated by the connecting portion 8 which is a thin portion, the connecting portion 8 is centered in the winding process. As a result, the divided core 5 can be rotated to form a wide space around the teeth 11, which simplifies the winding process. In addition, high-density windings can be made with respect to the cross-sectional area of the slot, and a motor with high efficiency can be obtained.

  The arrangement in the axial direction of the first iron core 10A described in the first modification (FIG. 15) or the second modification (FIG. 16) may be applied to this third modification.

<Rotary compressor>
Next, a rotary compressor 500 to which the motor 100 according to the first embodiment and each of the modifications can be applied will be described. FIG. 18 is a cross-sectional view showing the configuration of the rotary compressor 500. As shown in FIG. The rotary compressor 500 includes a closed container 507, a compression element 501 disposed in the closed container 507, and a motor 100 for driving the compression element 501.

  The compression element 501 includes a cylinder 502 having a cylinder chamber 503, a shaft 60 rotated by the electric motor 100, a rolling piston 504 fixed to the shaft 60, and a vane (shown in FIG. And the upper frame 505 and the lower frame 506 which the shaft 60 is inserted to close the axial end face of the cylinder chamber 503. An upper discharge muffler 508 and a lower discharge muffler 509 are attached to the upper frame 505 and the lower frame 506, respectively.

  The closed container 507 is, for example, a cylindrical container formed by drawing a steel plate having a thickness of 3 mm. At the bottom of the closed container 507, refrigeration oil (not shown) for lubricating the sliding parts of the compression element 501 is stored. The shaft 60 is rotatably held by an upper frame 505 and a lower frame 506 as bearings.

  The cylinder 502 internally includes a cylinder chamber 503, and the rolling piston 504 eccentrically rotates in the cylinder chamber 503. The shaft 60 has an eccentric shaft, and the rolling piston 504 is fitted to the eccentric shaft.

  The closed container 507 has a cylindrical frame 6. The stator 1 of the motor 100 is incorporated inside the frame 6 by a method such as shrink fitting, press fitting, or welding. Electric power is supplied to the winding 3 of the stator 1 from the glass terminal 511 fixed to the closed container 507. The shaft 60 is fixed to a central hole 26 formed at the center of the rotor core 21 (FIG. 1) of the rotor 2.

  An accumulator 510 for storing a refrigerant gas is attached to the outside of the closed container 507. A suction pipe 513 is fixed to the closed container 507, and the refrigerant gas is supplied from the accumulator 510 to the cylinder 502 through the suction pipe 513. Further, a discharge pipe 512 for discharging the refrigerant to the outside is provided at the upper part of the closed container 507.

  As the refrigerant, for example, R410A, R407C or R22 can be used. In addition, from the viewpoint of preventing global warming, it is desirable to use a low GWP (global warming potential) refrigerant.

  The operation of the rotary compressor 500 is as follows. The refrigerant gas supplied from the accumulator 510 is supplied into the cylinder chamber 503 of the cylinder 502 through the suction pipe 513. When the motor 100 is driven by energization of the inverter and the rotor 2 rotates, the shaft 60 rotates with the rotor 2. Then, the rolling piston 504 fitted to the shaft 60 eccentrically rotates in the cylinder chamber 503, and the refrigerant is compressed in the cylinder chamber 503. The refrigerant compressed in the cylinder chamber 503 passes through the discharge mufflers 508 and 509 and further rises in the closed container 507 through a hole (not shown) provided in the rotor core 21. The refrigerant which has risen in the closed container 507 is discharged from the discharge pipe 512 and supplied to the high pressure side of the refrigeration cycle.

  Although refrigerant oil is mixed in the refrigerant compressed in the cylinder chamber 503, separation of the refrigerant and the refrigerant oil is promoted when passing through the hole provided in the rotor core 21, and the refrigerant oil is Inflow to the discharge pipe 512 is prevented.

  The rotary compressor 500 is applicable to the motor 100 described in the first embodiment and the modifications, and the motor 100 has a small iron loss and has sufficient strength. Therefore, the energy efficiency and the reliability of the rotary compressor 500 can be improved.

  The motor 100 according to the first embodiment and each modification can be used not only for the rotary compressor 500 but also for other types of compressors.

<Refrigeration air conditioner>
Next, a refrigerating air conditioner 600 provided with the above-described rotary compressor 500 will be described. FIG. 19 is a diagram showing the configuration of the refrigeration air conditioning system 600. As shown in FIG. The refrigeration air conditioner 600 shown in FIG. 19 includes a compressor (rotary compressor) 500, a four-way valve 601, a condenser 602, a pressure reducing device (expander) 603, an evaporator 604, a refrigerant pipe 605, And a control unit 606. The compressor 500, the condenser 602, the pressure reducing device 603, and the evaporator 604 are connected by a refrigerant pipe 605 to constitute a refrigeration cycle.

  The operation of the refrigeration air conditioner 600 is as follows. The compressor 500 compresses the sucked refrigerant and sends it as a high-temperature, high-pressure gas refrigerant. The four-way valve 601 switches the flow direction of the refrigerant, but in the state shown in FIG. 19, the refrigerant sent from the compressor 500 flows to the condenser 602. The condenser 602 performs heat exchange between the refrigerant sent from the compressor 500 and air (for example, air outside the room), condenses the refrigerant, liquefies it, and sends it out. The pressure reducing device 603 expands the liquid refrigerant sent from the condenser 602 and sends it as a low-temperature low-pressure liquid refrigerant.

  The evaporator 604 performs heat exchange between the low-temperature low-pressure liquid refrigerant sent from the pressure reducing device 603 and the air (for example, indoor air) and causes the refrigerant to deprive the heat of the air for evaporation (vaporization). Send as. The air whose heat is removed by the evaporator 604 is supplied to a target space (for example, a room) by a fan (not shown). The operations of the four-way valve 601 and the compressor 500 are controlled by the control unit 606.

  The motor 500 described in each embodiment can be applied to the compressor 500 of the refrigeration air conditioner 600, and the motor 100 has a small iron loss and has sufficient strength. Therefore, the energy efficiency and reliability of the refrigeration air conditioner 600 can be improved.

  The components other than the compressor 500 in the refrigeration air conditioner 600 are not limited to the above-described configuration example.

  Although the preferred embodiments of the present invention have been specifically described above, the present invention is not limited to the above-described embodiments, and various improvements or modifications can be made without departing from the scope of the present invention. be able to.

  1 Stator, 2 Rotor, 3 Windings, 5 Split Cores, 5A First Split Iron Core, 5B Second Split Iron Core, 6 Frames, 7 Winding Nozzles, 8 Connecting Parts (Thin Wall), 10 Fixed Iron core, 10A 1st iron core, 10B 2nd iron core, 11 teeth, 11A teeth (1st teeth, 2nd teeth), 11B teeth (third teeth, 4th teeth), 12 yoke, 12A Yoke (first yoke), 12B yoke (second yoke), 13, 13A, 13B tooth tip portion, 15 connecting portion (crimping portion), 16A, 16B outer peripheral surface, 17A, 18A end surface (division surface), 17B , 18B end face, 21 rotor core, 22 magnet insertion hole, 23 flux barrier, 25 permanent magnet, 26 center hole, 30 inch 41, 42 fixing members, 50 electromagnetic steel plates, 52 ribbons, 54 electromagnetic steel plates, 60 shafts, 80 divided faces, 81 holes, 100 motors, 101, 102, 103 caulking parts, 500 rotary compressors (compressors), 600 refrigeration air conditioner.

A stator according to the present invention has a first yoke circumferentially extending about an axis, and first and second teeth extending from the first yoke toward the axis. A first core made of a magnetic steel sheet, a second yoke adjacent to the first yoke in the axial direction, and a first tooth and a first adjacent to the second teeth in the axial direction And a second iron core composed of an amorphous metal or a nanocrystalline metal, having three teeth and a fourth tooth. The first core, in the first yoke is divided in formed dividing plane between the first tooth and a second tooth, having a connecting portion for connecting the both sides of the dividing plane with each other. The connecting portion is formed of a crimped portion or a thin portion formed at the end portion on the outer peripheral side of the first yoke. The distance from the axis to the outer peripheral surface of the second yoke is smaller than the distance from the axis to the outer peripheral surface of the first yoke.

Claims (14)

A first yoke extending in a circumferential direction about an axis, and first and second teeth extending from the first yoke toward the axis, and made of a magnetic steel sheet The first iron core,
A second yoke adjacent to the first yoke in the direction of the axis, and third teeth and a fourth adjacent to the first teeth and the second teeth in the direction of the axis And a second iron core made of amorphous metal or nanocrystal metal, and
The first iron core is divided at a dividing surface formed between the first teeth and the second teeth in the first yoke, and connected at the outer peripheral surface side of the first yoke,
A stator, wherein a distance from the axis to an outer peripheral surface of the second yoke is smaller than a distance from the axis to an outer peripheral surface of the first yoke. The stator according to claim 1, wherein the first iron core is connected by a caulking portion or a thin portion formed at an end portion on an outer peripheral side of the first yoke. The first core is disposed at least at both ends of the stator in the direction of the axis,
The stator according to claim 1, wherein the second iron core is disposed to be sandwiched by the first iron core. The first core according to any one of claims 1 to 3, wherein the second iron core is separated by an air gap formed between the third teeth and the fourth teeth in the second yoke. The stator according to the item. The stator according to any one of claims 1 to 4, wherein a length of the first core in the direction of the axis is smaller than a length of the second core in the direction of the axis. The stator according to any one of claims 1 to 5, wherein the first core has a caulking portion on each of the first yoke, the first teeth, and the second teeth. The stator according to any one of claims 1 to 6, wherein the second iron core is formed of a laminate of thin ribbons thinner than the electromagnetic steel sheet. The stator according to claim 7, wherein the second iron core is formed of a laminate of a plurality of ribbons fixed to one another by an adhesive. The stator according to any one of claims 1 to 6, wherein the second core is formed of a powder compact. A stator and a rotor provided inside the stator,
The stator is
A first yoke extending in a circumferential direction about an axis, and first and second teeth extending from the first yoke toward the axis, and made of a magnetic steel sheet The first iron core,
A second yoke adjacent to the first yoke in the direction of the axis, and third teeth and a fourth adjacent to the first teeth and the second teeth in the direction of the axis And a second iron core made of amorphous metal or nanocrystal metal, and
The first iron core is divided at a dividing surface formed between the first teeth and the second teeth in the first yoke, and connected at the outer peripheral surface side of the first yoke,
The distance from the axis to the outer peripheral surface of the second yoke is smaller than the distance from the axis to the outer peripheral surface of the first yoke. The motor according to claim 10, wherein the rotor comprises a rotor core and a permanent magnet attached to the rotor core. The first core is formed of a magnetic steel sheet of thickness t1.
The second core is formed of a thin strip of thickness t2;
The rotor core is formed of a magnetic steel sheet of thickness tr,
The motor according to claim 11, wherein the thickness tr, the thickness t2, and the thickness tr satisfy t2 <t1 ≦ tr. A motor and a compression element driven by the motor;
The motor includes a stator and a rotor provided inside the stator.
A first yoke extending in a circumferential direction about an axis, and first and second teeth extending from the first yoke toward the axis, and made of a magnetic steel sheet The first iron core,
A second yoke adjacent to the first yoke in the direction of the axis, and third teeth and a fourth adjacent to the first teeth and the second teeth in the direction of the axis And a second iron core made of amorphous metal or nanocrystal metal, and
The first iron core is divided at a dividing surface formed between the first teeth and the second teeth in the first yoke, and connected at the outer peripheral surface side of the first yoke,
A compressor, wherein a distance from the axis to an outer peripheral surface of the second yoke is smaller than a distance from the axis to an outer peripheral surface of the first yoke. Equipped with a compressor, a condenser, a pressure reducing device and an evaporator,
The compressor comprises a motor and a compression element driven by the motor.
The motor includes a stator and a rotor provided inside the stator.
A first yoke extending in a circumferential direction about an axis, and first and second teeth extending from the first yoke toward the axis, and made of a magnetic steel sheet The first iron core,
A second yoke adjacent to the first yoke in the direction of the axis, and third teeth and a fourth adjacent to the first teeth and the second teeth in the direction of the axis And a second iron core made of amorphous metal or nanocrystal metal, and
The first iron core is divided at a dividing surface formed between the first teeth and the second teeth in the first yoke, and connected at the outer peripheral surface side of the first yoke,
The distance from the said axis line to the outer peripheral surface of a said 2nd yoke is smaller than the distance from the said axis line to the outer peripheral surface of a said 1st yoke.

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