JP6656429B2 - Stator, electric motor, compressor, and refrigeration air conditioner - Google Patents

Description

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

  Conventionally, a first portion in which a first electromagnetic steel sheet having a small thickness is laminated is disposed at an axial center portion of a stator, and a second electromagnetic steel sheet having a large thickness is provided at both axial end portions of the stator. 2. Description of the Related Art There is known an electric motor in which stacked second portions are arranged (for example, see Patent Document 1).

JP 2005-151648 A (see paragraphs 0014 to 0016)

  In the above configuration, since the first magnetic steel sheet forming the first portion is thin and has a small iron loss, a large amount of magnetic flux from the permanent magnet of the rotor flows to the first portion, so that the iron loss is reduced. However, since the second electromagnetic steel sheet forming the second portion is thick and has high magnetic permeability, the magnetic flux from the permanent magnet of the rotor easily flows to the second portion. Therefore, the effect of reducing iron loss cannot be sufficiently obtained.

  The present invention has been made to solve the above-described problem, and has as its object to provide a stator that can reduce iron loss more effectively.

A stator according to the present invention includes a first iron core having a first yoke extending in a circumferential direction about an axis, a first tooth extending from the first yoke toward the axis, A second yoke having an axial direction adjacent to the first yoke and a second tooth having an axial direction adjacent to the first tooth; The first iron core is formed of a laminate of electromagnetic steel sheets. The second iron core is formed of a laminate of amorphous metal or nanocrystalline metal ribbon, or a compression molded product of amorphous metal or nanocrystalline metal powder. The first tooth has a first protruding portion that protrudes in the circumferential direction at an inner end in the radial direction about the axis, and the second tooth has a first protruding portion in the inner end in the radial direction. And a second protruding portion that protrudes from The radial width around the axis of the first yoke is Y1, the radial width of the second yoke is Y2, the circumferential width of the first teeth is T1, and the circumferential width of the second teeth is T1. Assuming that the width in the direction is T2, at least one of Y1 <Y2 and T1 <T2 is satisfied. The radial width P1 of the first protrusion is smaller than the radial width P2 of the second protrusion.

The stator according to the present invention also includes a first iron core having a first yoke extending in a circumferential direction about the axis, and a first tooth extending from the first yoke toward the axis. , A second yoke adjacent in the axial direction to the first yoke, and a second iron core having second teeth adjacent in the axial direction to the first teeth. The first iron core is formed of a laminate of the first magnetic steel sheets. The second iron core is formed of a laminate of a second electromagnetic steel sheet that is thinner than the first electromagnetic steel sheet. The first tooth has a first protruding portion that protrudes in the circumferential direction at an inner end in the radial direction about the axis, and the second tooth has a first protruding portion in the inner end in the radial direction. And a second protruding portion that protrudes from The radial width around the axis of the first yoke is Y1, the radial width of the second yoke is Y2, the circumferential width of the first teeth is T1, and the circumferential width of the second teeth is T1. Assuming that the width in the direction is T2, at least one of Y1 <Y2 and T1 <T2 is satisfied. The radial width P1 of the first protrusion is smaller than the radial width P2 of the second protrusion.

  In the present invention, the width Y1 of the first yoke is smaller than the width Y2 of the second yoke (Y1 <Y2), or the width T1 of the first tooth is smaller than the width T2 of the second tooth (T1). Since <T2) or both are satisfied, the magnetic flux from the permanent magnet of the rotor easily flows to the second iron core. Therefore, iron loss can be effectively reduced.

FIG. 2 is a cross-sectional view illustrating the electric motor according to the first embodiment. FIG. 2 is a cross-sectional view illustrating the electric motor according to the first embodiment. FIG. 3 is a plan view showing a first iron core in the first embodiment. FIG. 3 is a plan view showing a first split core part according to the first embodiment. FIG. 3 is a plan view showing a second iron core in the first embodiment. FIG. 3 is a plan view showing a second split core part according to the first embodiment. FIG. 3 is a diagram illustrating an example (A) and another example (B) of a split core, an insulator, and a winding according to the first embodiment. FIG. 3 is a diagram showing a state in which the first iron core according to the first embodiment is developed in a belt shape. FIGS. 5A and 5B are schematic diagrams for explaining a winding step in the first embodiment. FIGS. FIG. 4 is a cross-sectional view for explaining an operation of the electric motor according to the first embodiment. FIG. 3 is a cross-sectional view illustrating a configuration of a motor according to a first modification of the first embodiment. FIG. 4 is a cross-sectional view illustrating a configuration of a motor according to a second modification of the first embodiment. FIG. 15 is a plan view showing a second iron core of the electric motor according to the second embodiment. FIG. 13 is a cross-sectional view illustrating an electric motor according to a third embodiment. FIG. 13 is a cross-sectional view illustrating an electric motor according to a third embodiment. It is sectional drawing (A) which shows the electric motor in Embodiment 4, and sectional drawing (B) which shows the rotor of an electric motor, (C). FIG. 21 is a plan view showing a first configuration example of a first iron core according to a fifth embodiment. FIG. 21 is a plan view showing a second configuration example of the first iron core in the fifth embodiment. FIG. 35 is a plan view showing a third configuration example of the first iron core in the fifth embodiment. FIG. 35 is a plan view showing a fourth configuration example of the first iron core in the fifth embodiment. FIG. 21 is a plan view showing a first configuration example of a first iron core according to a sixth embodiment. FIG. 20 is a plan view showing a second configuration example of the first iron core in the sixth embodiment. FIG. 21 is a plan view showing a third configuration example of the first iron core in the sixth embodiment. FIG. 21 is a plan view showing a fourth configuration example of the first iron core in the sixth embodiment. FIG. 21 is a plan view showing a fifth configuration example of the first iron core in the sixth embodiment. It is a sectional view showing the composition of the rotary compressor to which the electric motor of each embodiment can be applied. It is a figure which shows the structure of the refrigerating air conditioner provided with the rotary compressor of FIG.

Embodiment 1 FIG.
<Structure of electric motor>
The electric motor 100 according to Embodiment 1 of the present invention will be described. FIG. 1 is a cross-sectional view illustrating a configuration of electric motor 100 according to Embodiment 1 of the present invention. The electric motor 100 is a permanent magnet embedded type electric motor in which a permanent magnet 25 is embedded in a rotor 2, and is used, for example, in a rotary compressor 500 (see FIG. 26).

  The electric motor 100 is an electric motor called an inner rotor type, and includes 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 C1) of the rotor 2.

  Hereinafter, the direction of the axis C1 that is the rotation axis of the rotor 2 is simply referred to as “axial direction”. Also. A circumferential direction around the axis C1 is simply referred to as a “circumferential direction”. The radial direction of the stator 1 and the rotor 2 about the axis C1 is simply referred to as “radial direction”. Also 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 a direction toward the axis C1). At a radially inner end of the tooth 11, a tooth tip 13 facing the outer peripheral surface of the rotor 2 is formed. The tooth tip 13 has a width (length in the circumferential direction) wider than other portions of the tooth 11. That is, the tooth tip 13 has the protrusions 14 protruding 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. A slot, which is a space in which the windings 3 are arranged, is formed between the teeth 11 that are adjacent in the circumferential direction.

  Further, the stator core 10 has a configuration in which a plurality of (here, nine) divided cores 5 are connected in the circumferential direction for each tooth 11. The split cores 5 are connected to each other at a connecting portion 15 provided at an outer peripheral end of the yoke 12. The connecting portion 15 is formed of, for example, a plastically deformable thin portion.

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

  The rotor 2 has a cylindrical rotor core 21, a permanent magnet 25 attached to the rotor core 21, and a shaft 60 arranged at the center of the rotor core 21. The shaft 60 is, for example, the shaft of the rotary compressor 500 (FIG. 26). 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 of the magnetic steel plates with fixing members 41 and 42 (FIG. 3). The thickness tr of the electromagnetic steel sheet forming the rotor core 21 is, for example, 0.1 to 0.7 mm.

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

  The permanent magnet 25 is a plate-shaped member that 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 mainly containing neodymium (Nd), iron (Fe), and boron (B). The permanent magnet 25 is magnetized in the thickness direction.

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

  Flux barriers (leakage flux suppressing holes) 23 are formed at both circumferential ends of the magnet insertion hole 22. The flux barrier 23 suppresses leakage magnetic 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 a short circuit of the magnetic flux between the adjacent permanent magnets 25. The thickness of the thin portion is desirably the same as the thickness of the electromagnetic steel sheet forming the rotor core 21.

  FIG. 2 is a cross-sectional view showing a configuration of the electric motor 100 in a plane including the axis C1. The stator core 10 has a first iron core 10A formed of a laminated body of electromagnetic steel sheets, and a second iron core 10B formed of a thin laminated body of an amorphous metal or a nanocrystalline metal. The first iron core 10A and the second iron core 10B are alternately arranged in the axial direction (the direction of the axis C1). In particular, the first core 10 </ b> A is arranged at least at both ends in the axial direction of the stator core 10.

  Here, the first cores 10A are arranged at both ends and the center of the stator core 10 in the axial direction, respectively. The second iron core 10B is disposed so as to be sandwiched between the first iron cores 10A adjacent in the axial direction.

  The thickness (length in the axial direction) of the first iron core 10A disposed at one axial end (the upper end in FIG. 2) of the stator core 10 is L1, and the thickness of the second iron core 10B adjacent thereto is L1. Is L2. The thickness of the first iron core 10A disposed at the axial center of the stator core 10 is L3, the thickness of the second iron core 10B adjacent to the first iron core 10B is L4, and the other end of the stator iron core 10 in the axial direction is L3. The thickness of the first iron core 10A disposed at (the lower end in FIG. 3) is L5.

  The sum of the thicknesses of the first cores 10A (= L1 + L3 + L5) is smaller than the sum of the thicknesses of the second cores 10B (= L2 + L4). This is to make it easier for the magnetic flux from the permanent magnet 25 of the rotor 2 to flow to the second iron core 10B. In addition, the total L0 of the thickness of the first core 10A and the thickness of the second core 10B is the same as the axial length L6 of the rotor core 21 here, but is not necessarily required to be the same ( (See FIG. 12 described later.)

  Of the stator cores 10, the first core 10A projects radially outward from the second core 10B. The first iron core 10 </ b> A is incorporated inside the cylindrical frame 6 of the electric motor 100 by shrink fitting, press fitting, welding, or the like. The frame 6 is, for example, a part of a closed container of the rotary compressor 500 (FIG. 26).

  FIG. 3 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 0.35 to 1.00 mm are laminated in the axial direction. As the magnetic steel sheet, for example, a non-oriented magnetic steel sheet is used, but it is not limited to this.

  The first iron core 10A has a yoke 12A (first yoke) extending in the circumferential direction, and a plurality of teeth 11A (first teeth) extending radially inward from the yoke 12A. The yoke 12A has an outer peripheral surface 16A that contacts the inner peripheral surface of the frame 6 (FIG. 2). Here, the number of the teeth 11A is nine.

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

  At an end on the outer peripheral side of the yoke 12A, a connecting portion 15 formed of, for example, a thin portion is formed. The connecting portion 15 is disposed at one circumferential end of each of the first split core portions 5A. The connecting portion 15 is a portion that connects the first divided core portions 5A adjacent to each other in the circumferential direction.

  With this configuration, the plurality of first divided core portions 5A that constitute the first core 10A are rotatably connected around the connection portion 15. That is, the first iron core 10A can be developed in a belt shape (see FIG. 8) and can be combined in an annular shape. Here, the connecting portion 15 is a thin portion that can be plastically deformed, but is not limited to the thin portion, and may be, for example, a circular caulked portion.

  FIG. 4 is a plan view showing the first split core part 5A (first core 10A). In the first split core portion 5A, the circumferential central portion of the yoke 12A is continuous with the teeth 11A. A tooth tip 13A facing the outer peripheral surface of the rotor 2 is formed radially inward of the tooth 11A. The tooth tip 13A is wider than the other parts of the tooth 11A, and has protrusions 14A (first protrusions) on both sides in the circumferential direction.

  In the first split core part 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 division surfaces.

  When the first cores 10A are combined in an annular shape as shown in FIG. 3, the end faces 17A and 18A of the yoke 12A of the first split core 5A are respectively connected to the first split cores 5A adjacent in the circumferential direction. It comes into contact with the end surfaces 18A and 17A of the yoke 12A.

  The end surfaces 17A and 18A extend radially outward from the inner peripheral surface of the yoke 12A toward the outer peripheral surface 16A, but do not reach the outer peripheral surface 16A. A hole 105 is formed at the end of the end face 18A (that is, at the outer end in the radial direction). The thin portion between the hole 105 of the yoke 12A and the outer peripheral surface 16A is a portion that can be plastically deformed, and this thin portion constitutes the connecting portion 15.

  A concave portion (notch portion) 19 is formed on the outer peripheral surface 16A of the yoke 12A. The concave portion 19 is a portion where the stator 1 is chucked with a jig in a later-described winding step (FIG. 9).

  A caulking portion (teeth caulking portion) 101 is formed at the radial center of the tooth 11A. On both sides in the circumferential direction of the concave portion 19 of the yoke 12A, caulked portions (yoke caulked portions) 102 and 103 are formed.

  The caulked portion 101 of the tooth 11 and the caulked portions 102 and 103 of the yoke 12 are for fixing the electromagnetic steel sheets adjacent in the axial direction to each other. By fixing the electromagnetic steel plate at the caulked portion 101 of the tooth 11 and the caulked portions 102 and 103 of the yoke 12, high dimensional accuracy and high rigidity of the first iron core 10A (the tooth 11A and the yoke 12A) can be obtained.

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

  FIG. 5 is a plan view showing the configuration of the second iron core 10B. The second iron core 10B is made of an amorphous metal or a nanocrystalline metal. The second iron core 10B is formed of a laminate in which thin ribbons having a thickness of 0.02 mm to 0.05 mm are laminated in the axial direction. Second iron core 10B is fixed to first iron core 10A (FIG. 3) by an adhesive or a resin.

  When laminating ribbons of amorphous metal or nanocrystalline metal, it is difficult to fix them by caulking parts such as electromagnetic steel sheets. Fix it. In this case, since the adhesive is interposed between the laminated ribbons, an effect of suppressing eddy current loss can be obtained.

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

  Further, the second iron core 10B is not limited to a laminate of amorphous metal or nanocrystalline metal ribbons, but may be formed of a compression molded body of amorphous metal or nanocrystalline metal powder (see FIG. 12).

  The second iron core 10B has a yoke 12B (second yoke) extending in the circumferential direction, and a plurality of teeth 11B (second teeth) extending radially inward from the yoke 12B. The yoke 12B has an outer peripheral surface 16B facing the inner peripheral surface of the frame 6 (FIG. 3). Here, the number of the teeth 11B is nine.

  In the second core 10B, a portion corresponding to the split core 5 (a portion including one tooth 11B) is referred to as a second split core 5B. That is, the second core 10B is divided into a plurality of (here, nine) second divided core portions 5B in the circumferential direction. The second divided core portions 5B adjacent in the circumferential direction are separated from each other by a gap G of 0.1 mm or less.

  FIG. 6 is a plan view showing a second split core part 5B (second core 10B). In the second split core portion 5B, the central portion in the circumferential direction 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 radially inward of the tooth 11B. The tooth tip 13B is wider than other portions of the tooth 11B, and has projections 14B (second projections) on both sides in the circumferential direction.

  The outer peripheral surface 16B of the yoke 12B is located radially inward of the outer peripheral surface 16A (FIG. 4) of the yoke 12A. The circumferential end faces 17B and 18B of the yoke 12B in the second split core part 5B are located on the circumferential inner side than the end faces 17A and 18A (FIG. 4) of the yoke 12A in the first split core part 5A. are doing. The teeth 11B and the yoke 12B of the second core 10B are not provided with the swaging portions 101, 102, and 103 (FIG. 4A) of the first core 10A.

  FIG. 7A is a diagram illustrating the split core 5 (the first split core portion 5A and the second split core portion 5B), the insulator 30 and the winding 3. In FIG. 7A, the circumferential width of the teeth 11A of the first split core portion 5A is T1 and the radial width of the yoke 12A is Y1. Further, the circumferential width of the teeth 11B of the second divided core portion 5B is T2, and the radial width of the yoke 12B is Y2.

  In the stator core 10 of this embodiment, the width T1 of the teeth 11A is smaller than the width T2 of the teeth 11B (T1 <T2), or the width Y1 of the yoke 12A is smaller than the width Y2 of the yoke 12B (Y1 < Y2), or both. That is, the first iron core 10A is configured such that the magnetic path is narrower than the second iron core 10B.

  In the example shown in FIG. 7A, the width T1 of the teeth 11A is smaller than the width T2 of the teeth 11B, and the width Y1 of the yoke 12A is smaller than the width Y2 of the yoke 12B (that is, T1 < T2, and Y1 <Y2).

  In addition, the radial width of the circumferential protrusion 14A of the teeth 11A is P1 and the radial width of the circumferential protrusion 14B of the teeth 11B is P2. Here, the radial width P1 of the protruding portion 14A of the tooth 11A is smaller than the radial width P2 of the protruding portion 14B of the tooth 11B (P1 <P2).

  The outer peripheral surface 16B of the yoke 12B is located radially inward of the outer peripheral surface 16A of the yoke 12A. In other words, the distance r1 from the axis C1 to the outer peripheral surface 16A of the yoke 12A (FIG. 3) is greater than the distance r2 from the axis C1 to the outer peripheral surface 16B of the yoke 12B (FIG. 5) (r1> r2).

  The radially inner end face (the end face facing the rotor 2) of the tooth tip 13A is located on the same plane as the radial value side end face of the tooth tip 13B. However, the configuration is not limited to such a configuration, and the end surface of the tooth tip 13A may be separated from the rotor 2 (see FIG. 14).

  The windings 3 are wound around the teeth 11 (the teeth 11A and the teeth 11B) via the insulator 30. The insulator 30 includes a peripheral wall portion 31 formed on both side surfaces 111 of the teeth 11 in the circumferential direction (more specifically, side surfaces 111B of the teeth 11B), and an inner peripheral surface 121 of the yoke 12 (more specifically, the yoke 12B). An outer wall portion 32 is formed on the inner peripheral surface 121B), and an inner wall portion 33 is formed on a radially outer surface of the protrusion 14.

  The winding 3 is arranged in a region surrounded by the peripheral wall portion 31, the outer wall portion 32, and the inner wall portion 33 of the insulator 30. The peripheral wall portion 31 of the insulator 30 is also formed on both end surfaces of the teeth 11 in the axial direction (see FIG. 2). A magnet wire having a diameter of, for example, 1.0 mm is wound around each of the teeth 11 via the insulator 30 for 80 turns to form the winding 3.

  As described above, since the width T1 of the teeth 11A is smaller than the width T2 of the teeth 11B and the width Y1 of the yoke 12A is smaller than the width Y2 of the yoke 12B, the side surface 111A of the teeth 11A and the inner peripheral surface 121A of the yoke 12A A gap S is formed between the insulator 30 and the insulator 30.

  However, as shown in FIG. 7B, the resin 35 may be filled between the insulator 30 and the side surface 111A of the teeth 11A and the inner peripheral surface 121A of the yoke 12A. By doing so, the insulator 30 can be more firmly held.

  As described above, the outer peripheral surface 16B of the yoke 12B is located radially inward of the outer peripheral surface 16A of the yoke 12A. Therefore, as shown in FIG. 2, the outer peripheral surface 16A of the yoke 12A contacts the frame 6, but the outer peripheral surface 16B of the yoke 12B is separated from the frame 6. Therefore, the external force from the frame 6 acts on the first core 10A, but the external force from the frame 6 does not act on the second iron core 10B.

  Further, the end faces 17B, 18B of the yoke 12B in the second split core part 5B (FIG. 4) are respectively located inward in the circumferential direction from the end faces 17A, 18A (FIG. 6) of the yoke 12A in the first split core part 5A. are doing. Therefore, a gap G (FIG. 5) is formed between the second divided core portions 5B adjacent in the circumferential direction. Therefore, no external force from the adjacent second split core 5B acts on the second split core 5B.

  The first core 10A is divided into a plurality of first divided core portions 5A connected by a connection portion 15 on the outer peripheral side of the yoke 12A. On the other hand, the second core 10B is divided into a plurality of second divided core portions 5B separated from each other via the gap G.

<Electric motor manufacturing process>
Next, the manufacturing process of the electric motor 100 will be described. First, a plurality of steel plate portions each having a shape including the teeth 11A and the yoke 12A are punched from an electromagnetic steel plate. Here, as shown in FIG. 8, a steel plate portion connected in a strip shape is punched. Next, a plurality of punched steel plate portions are laminated in the axial direction, and are fixed to each other by caulking portions 101, 102, and 103.

  In addition, a plurality of thin ribbon portions each having a tooth 11B and a yoke 12B are punched from a thin ribbon of an amorphous metal or a nanocrystalline metal. Next, a plurality of punched thin ribbon portions are laminated in the axial direction and fixed to each other by bonding to form the second split core portion 5B shown in FIG. Then, the plurality of second divided core portions 5B are fixed to the first core 10A (FIG. 8). Thereby, the stator core 10 in which the divided cores 5 are arranged in a strip shape is formed.

  Next, the insulator 30 (FIG. 7) 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 a resin, or a pre-molded resin molded body may be used as the stator core 10. It may be formed by being fitted into a.

  After forming the insulator 30 in the stator core 10, winding is performed. FIGS. 9A and 9B are schematic diagrams for explaining a winding step. First, as shown in FIG. 9 (B), among the stator cores 10 in which a plurality of divided cores 5 are arranged in a belt shape, the divided cores 5 for performing winding are fixed at the winding positions with jigs. The split core 5 is rotated about the connecting portion 15 so that the interval between the adjacent teeth 11 is increased. Thereby, a wide space is formed around the teeth 11 for winding.

  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 tooth 11 as indicated by an arrow R2 in FIG. 9B, and winds the winding 3 around the tooth 11.

  After winding the winding 3 around each tooth 11, the stator core 10 is assembled in a ring shape as shown in FIG. 9 (A). At this time, the butting portions (indicated by W in FIG. 1) of the split cores 5 at both ends of the stator core 10 are butted and welded to each other.

  Thus, the stator 1 including the stator core 10, the insulator 30, and the windings 3 is completed. Thereafter, the stator 1 is assembled into the frame 6 by shrink fitting, press fitting, or welding. As described above, among the stator cores 10, the first core 10A contacts the frame 6, but the second core 10B does not contact the frame 6.

  Further, a steel plate portion having the shape of the rotor core 21 having the magnet insertion hole 22, the flux barrier 23 and the center hole 26 is punched from the electromagnetic steel plate. Next, a plurality of punched steel plates are laminated in the axial direction, and fixed from both sides in the axial direction by fixing members 41 and 42 (FIG. 2), thereby forming the rotor core 21 shown in FIG.

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

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

  The stator core 10 (the first core 10A and the second core 10B) faces the outer peripheral surface of the rotor 2. The magnetic flux from the permanent magnet 25 of the rotor 2 flows into the tooth 11 from the tooth tip 13 (FIG. 1), and flows inside the tooth 11 radially outward. The magnetic flux flowing in the teeth 11 flows into the yoke 12 and further flows in the yoke 12 in the circumferential direction. In this manner, a magnetic flux path (magnetic path) passing through the teeth 11 and the yoke 12 is formed, and a torque for rotating the rotor 2 is generated by the action of the magnetic flux and the current flowing through the winding 3.

  Of the teeth 11A and 11B constituting the tooth 11, the width T1 of the tooth 11A is smaller than the width T2 of the tooth 11B (T1 <T2). The width P1 of the protrusion 14A of the tooth 11A is smaller than the width P2 of the protrusion 14B of the tooth 11B (P1 <P2). Therefore, the magnetic flux from the permanent magnet 25 of the rotor 2 flows into the teeth 11B more easily than the teeth 11A.

  The second iron core 10B is made of an amorphous metal or a nanocrystalline metal. However, since the amorphous metal has atoms which are amorphous and has no directionality, and the crystal grains of the nanocrystalline metal are refined to the order of 10 μm. , All have excellent magnetic properties and low magnetic resistance. Therefore, more magnetic flux from the permanent magnet 25 of the rotor 2 flows to the teeth 11B than to the teeth 11A, so that iron loss is reduced.

  The magnetic flux flowing through the teeth 11 flows into the yoke 12 on the outer peripheral side. Of the yokes 12A and 12B constituting the yoke 12, the width Y1 of the yoke 12A is smaller than the width Y2 of the yoke 12B (Y1 <Y2), so that more magnetic flux flows to the yoke 12B than to the yoke 12A, thereby causing iron loss. Decrease.

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

  Further, the electromagnetic steel sheet constituting the first iron core 10A has a property that the magnetic resistance increases when it is subjected to compressive stress, although it is not so remarkable as amorphous metal. Therefore, when 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 hardly flows to the first iron core 10A. As a result, the magnetic flux flowing through the second iron core 10B made of the amorphous metal or the nanocrystalline metal (therefore, the magnetic resistance is small) increases, and the iron loss can be further reduced.

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

  Further, when the second iron core 10B is formed of a compression-molded body of amorphous metal powder, the mechanical strength of the second iron core 10B may decrease. The core 10B does not contact the frame 6, so that the damage to the second core 10B can be suppressed.

  Further, since the second iron core 10B (the teeth 11B and the yoke 12B) can be held by the first iron core 10A (the teeth 11A and the yoke 12A) made of an electromagnetic steel plate, the rigidity of the stator 1 can be increased. it can.

<Effects of Embodiment>
As described above, according to Embodiment 1 of the present invention, stator core 10 includes first core 10A having teeth 11A and yoke 12A, and second core 10B having teeth 11B and yoke 12B. Is provided. The first iron core 10A is formed of a laminated body of electromagnetic steel sheets, and the second iron core 10B is formed of a thin laminated body of an amorphous metal or a nanocrystalline metal, or a compression molding of an amorphous metal powder or a nanocrystalline metal powder. It is composed of the body. In addition, T1 <T2, Y1 <Y2, or both are established between the width T1 of the teeth 11A, the width T2 of the teeth 11B, the width Y1 of the yoke 12A, and the width Y2 of the yoke 12B. Therefore, the magnetic flux from the permanent magnet 25 of the rotor 2 easily flows to the second iron core 10B, and the iron loss can be reduced.

  Further, since the second iron core 10B (the teeth 11B and the yoke 12B) can be held by the first iron core 10A (the teeth 11A and the yoke 12A), the rigidity of the stator iron core 10 can be increased, and vibration and noise can be obtained. Can be suppressed.

  Furthermore, since the width P1 of the protrusion 14A of the tooth 11A is smaller than the width P2 of the protrusion 14B of the tooth 11B (P1 <P2), the magnetic flux from the permanent magnet 25 of the rotor 2 is more concentrated on the tooth 11B than on the tooth 11A. Easy to flow. Therefore, iron loss can be effectively reduced.

  The amorphous metal and the nanocrystalline metal have a property of increasing the magnetic resistance when subjected to a compressive stress. However, since the outer diameter of the second core 10B is smaller than the outer diameter of the first iron core 10A, the stator core When the frame 10 is assembled into the frame 6 by shrink fitting or the like, external force from the frame 6 can be received by the first iron core 10A. Therefore, an increase in the magnetic resistance of second core 10B can be suppressed, and iron loss can be effectively reduced.

  Further, 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 smaller than the area of the teeth 11A facing the rotor 2. The area where 11B faces the rotor 2 is larger. As a result, the magnetic flux from the permanent magnet 25 of the rotor 2 easily flows to the second core 10B of the stator core 10, and iron loss can be effectively reduced.

  Further, since the first iron core 10A is disposed at both ends and the center of the stator core 10 in the axial direction, sufficient strength of the stator core 10 can be obtained.

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

  Further, since the second iron core 10B is divided in the circumferential direction with a gap G formed between the adjacent teeth 11B, no external force acts between the adjacent second divided iron core portions 5B. Therefore, an increase in iron loss can be suppressed.

  Further, since the second iron core 10B is formed of a laminated body in which a plurality of thin ribbons are stacked or a compression-molded body of powder, the manufacture of the second iron core 10B becomes easy. In addition, by interposing an adhesive between a plurality of ribbons, the second iron cores 10B can be firmly integrated with each other, and eddy current loss can be reduced. Further, by annealing the laminate of the amorphous metal ribbon, distortion generated during molding can be removed, and the magnetic characteristics can be improved.

First modified example.
FIG. 11 is a cross-sectional view illustrating a configuration of a motor according to a first modification of the first embodiment. The stator core 10 of the first embodiment has the first core 10A at both ends and the center in the axial direction (FIG. 2). On the other hand, the stator core 10 of the first modified example has the first core 10A only at both ends in the axial direction. The second core 10B is arranged between the two first cores 10A.

  Assuming that the thickness of the first core 10A of the stator core 10 is L11 and L13, respectively, and the thickness of the rotor core 21 is L12, the total thickness (L11 + L13) of the first core 10A is the second thickness. It is smaller than the thickness (L12) of the 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 the first modified example, since the portion excluding both ends in the axial direction of the stator core 10 is constituted by the second core 10B, the magnetic flux from the permanent magnet 25 of the rotor 2 is applied to the second core 10B. Easy to flow. Therefore, iron loss can be reduced more effectively. Further, since the first iron cores 10A are arranged at both ends in the axial direction of the stator core 10, sufficient strength of the stator iron core 10 can be obtained.

Second modified example.
FIG. 12 is a cross-sectional view illustrating a configuration of a motor according to a second modification of the first embodiment. In the first embodiment, the axial length of stator core 10 is the same as the axial length of 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 modified example, the first cores 10 </ b> A at both ends in the axial direction of the stator core 10 are arranged outside the both ends in the axial direction of the rotor core 21 in the axial direction. Therefore, the area where rotor core 21 and second core 10B face each other is larger than in the first embodiment. Note that the point that the total thickness of first core 10A is smaller than the total thickness of second core 10B is the same as in the first embodiment.

  FIG. 12 shows an example in which the second iron core 10B is formed of a compact (compressed compact) obtained by compression-molding an amorphous metal or nanocrystalline metal powder. You may comprise a laminated body of a ribbon.

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

  In FIG. 12, the first core 10A is provided at both ends and the center of the stator core 10 in the axial direction. However, as in the first modified example (FIG. 11), the first core 10A is provided in the axial direction. The first core 10A may be provided only at both ends.

Embodiment 2 FIG.
FIG. 13 is a plan view showing a second iron core 10C of the electric motor according to the second embodiment. In Embodiment 1 described above, the second iron core 10B is formed of an amorphous metal or a nanocrystalline metal. On the other hand, in the second embodiment, second iron core 10C is formed of a laminate of electromagnetic steel sheets.

  The electrical steel sheet constituting the second iron core 10C is, for example, a non-oriented electrical steel sheet obtained by adding 3% to 6.5% of silicon (Si) to high-purity iron (Fe). The thickness t2 of the electromagnetic steel sheet (also referred to as the second electromagnetic steel sheet) constituting the second core 10C is equal to or less than the thickness t1 of the electromagnetic steel sheet (also referred to as the first electromagnetic steel sheet) constituting the first iron core 10A. is there. Specifically, the thickness t2 of the electromagnetic steel sheet forming second iron core 10C is in the range of 0.1 mm ≦ t2 <0.35 mm.

  The second iron core 10C has a yoke 12C (second yoke) extending in the circumferential direction and a plurality of teeth 11C (second teeth) extending radially inward from the yoke 12C. The yoke 12C has an outer peripheral surface 16C that contacts the inner peripheral surface of the frame 6 (FIG. 2). Here, the number of the teeth 11C is nine.

  In the second core 10C, a portion corresponding to the split core 5 (a portion including one tooth 11C) is referred to as a second split core 5C. That is, the second core 10C is divided into a plurality of (here, nine) second divided core portions 5C in the circumferential direction. The circumferential end faces 17C and 18C of the yoke 12C in the second split core portion 5C form a split surface of the second core 10C.

  The second divided core portions 5C of the second core 10C are connected to each other by a connection portion 15C provided on the outer peripheral portion of the yoke 12C. The connecting portion 15C is formed of a thin portion, similarly to the connecting portion 15 (FIG. 3) of the first embodiment. Since the second core 10C is formed of an electromagnetic steel plate, a configuration in which the plurality of second divided core portions 5C are connected by the connection portion 15C as described above can be realized.

  On the teeth 11C and the yoke 12C of the second iron core 10C, crimping portions 101, 102, and 103 similar to the first iron core 10A are formed. The caulking portions 101, 102, and 103 fix the electromagnetic steel plates adjacent to each other in the axial direction. By fixing the magnetic steel sheet with the caulking portions 101, 102, 103, high dimensional accuracy and high rigidity of the second iron core 10C can be obtained. In the second embodiment, the first iron core 10A and the second iron core 10C can be fixed by the caulking portions 101, 102, 103, so that the first iron core 10A and the second iron core 10C do not need to be bonded. .

  The circumferential width T2 of the teeth 11B is larger than the circumferential width T1 (FIG. 4) of the teeth 11A (T1 <T2). The radial width Y2 of the yoke 12B is larger than the radial width Y1 of the yoke 12A (FIG. 4) (Y1 <Y2). The radial width P2 of the protruding portion 14B of the tooth 11B is larger than the radial width P1 of the protruding portion 14A of the tooth 11A (P1 <P2). That is, the second iron core 10C is configured to have a wider magnetic path than the first iron core 10A.

  The configuration of the electric motor according to the second embodiment is the same as that of the electric motor according to the first embodiment except for a second iron core 10C.

  The thickness t2 of the electromagnetic steel sheet forming the second core 10C is equal to or less than the thickness t1 of the electromagnetic steel sheet forming the first iron core 10A, and the second iron core 10C is more magnetic than the first iron core 10A. Since the path is wide, the magnetic flux from the permanent magnet 25 of the rotor 2 flows more easily to the second core 10C than to the first core 10A. As a result, iron loss can be reduced.

  Thus, according to the second embodiment of the present invention, stator core 10 includes first core 10A having teeth 11A and yoke 12A, and second core 10C having teeth 11B and yoke 12B. . The first iron core 10A is formed of a laminate of a first magnetic steel sheet having a thickness of t1, and the second iron core 10C is formed of a laminate of a second electromagnetic steel sheet having a thickness of t2 (<t1). . In addition, T1 <T2, Y1 <Y2, or both are established between the width T1 of the teeth 11A, the width T2 of the teeth 11B, the width Y1 of the yoke 12A, and the width Y2 of the yoke 12B. Therefore, the magnetic flux from the permanent magnet 25 of the rotor 2 easily flows to the second iron core 10B, and the iron loss can be reduced.

  Further, in the second embodiment, since second iron core 10C is made of an electromagnetic steel sheet, stator iron core 10 having a higher strength can be obtained as compared with the case where it is made of an amorphous metal or a nanocrystalline metal. Further, since the magnetic steel sheet can be easily processed (for example, pressed), the productivity is improved, and the manufacturing cost can be reduced.

  Note that the axial arrangement of the first iron core 10A described in the first modification (FIG. 11) or the second modification (FIG. 12) may be applied to the second embodiment.

Embodiment 3 FIG.
FIG. 14 is a cross-sectional view of the electric motor according to Embodiment 3 of the present invention, taken along a plane orthogonal to axis C1. FIG. 15 is a cross-sectional view of the electric motor according to Embodiment 3 in a cross-section including axis C1.

  In the first embodiment described above, the inner peripheral end face (radially inner end face) of tooth tip 13A of first iron core 10A and the inner peripheral end face of tooth tip 13B of second iron core 10B are flush with each other. (FIG. 7A). On the other hand, in the third embodiment, as shown in FIG. 14, the inner peripheral end face of the tooth tip 13A is located radially outside the inner peripheral end face of the tooth tip 13B.

  That is, as shown in FIG. 15, the gap between the outer peripheral surface 200 of the rotor 2 and the inner peripheral end surface of the teeth tip 13A is larger than the gap between the outer peripheral surface 200 of the rotor 2 and the inner peripheral end face of the teeth tip 13B. Is also big. Therefore, the magnetic flux from the permanent magnet 25 of the rotor 2 does not easily flow to the first iron core 10A, and easily flows to the second iron core 10B. As a result, a large amount of magnetic flux flows through the second iron core 10B made of an amorphous metal or a nanocrystalline metal, whereby iron loss can be reduced.

  The configuration of the electric motor according to the third embodiment is the same as that of the electric motor according to the first embodiment except for the configuration of teeth tip portions 13A and 13B.

  In the third embodiment, since the inner peripheral end face of the tooth tip 13A is located radially outside the inner peripheral end face of the tooth tip 13B, the magnetic flux from the permanent magnet 25 of the rotor 2 is the first magnetic flux. Flows more easily to the second iron core 10B than to the iron core 10A. Therefore, iron loss can be effectively reduced.

  Note that the axial arrangement of the first iron core 10A described in the first modification (FIG. 11) or the second modification (FIG. 12) may be applied to the third embodiment. Further, the second core 10B is made of an amorphous metal or a nanocrystalline metal (thin laminate or powder compact), but as in the second embodiment, the first core 10A It may be composed of a laminate of electromagnetic steel sheets thinner than the electromagnetic steel sheets.

Embodiment 4 FIG.
FIG. 16A is a cross-sectional view of the electric motor according to Embodiment 4 of the present invention, taken along a plane including axis C1. In the fourth embodiment, rotor core 21 has first core 21A and second core 21B in the axial direction. The first core 21A faces the first core 10A of the stator core 10, and the second core 21B faces the second core 10B of the stator core 10.

  The outer peripheral surface 201 of the first iron core 21A is formed at a position retracted radially inward (on the side away from the stator 1) from the outer peripheral surface 202 of the second iron core 21B. That is, the gap between the outer peripheral surface 201 of the first iron core 21A and the inner peripheral surface of the first iron core 10A (that is, the inner peripheral end surface of the tooth tip 13A shown in FIG. 4) is equal to the outer peripheral surface of the second iron core 21B. It is wider than the gap between the surface 202 and the inner peripheral surface of the second iron core 10B (that is, the inner peripheral end surface of the tooth tip 13B shown in FIG. 6).

  FIG. 16B is a cross-sectional view of the second core 21 </ b> B of the rotor 2. FIG. 16C is a cross-sectional view of the first iron core 21 </ b> A of the rotor 2. As shown in FIG. 16B, the outer peripheral surface 202 of the second iron core 21B is formed in a circular shape around the axis C1. On the other hand, as shown in FIG. 16C, the outer peripheral surface 201 of the first iron core 21 </ b> A is located between the poles (the peripheral part of the End in the direction) protrudes radially outward.

  Thus, the gap between the outer peripheral surface 201 of the first iron core 21A of the rotor core 21 and the inner peripheral surface of the stator core 10 is equal to the outer peripheral surface 202 of the second iron core 21B of the rotor core 21 and the stator core. 10 is larger than the gap with the inner peripheral surface. Therefore, the magnetic flux from the permanent magnet 25 of the rotor 2 hardly flows to the first iron core 10A, and easily flows to the second iron core 10B. As a result, a large amount of magnetic flux flows through the second iron core 10B made of an amorphous metal or a nanocrystalline metal, whereby iron loss can be reduced.

  The configuration of the motor of the fourth embodiment is the same as that of the first embodiment except for the configuration of rotor core 21.

  In the fourth embodiment, the first core 21A of the rotor core 21 facing the first core 10A of the stator core 10 is the same as the first core 21A of the rotor core 21 facing the second core 10B of the stator core 10. It retracts radially inward from the second iron core 21B. Therefore, the magnetic flux from the permanent magnet 25 of the rotor 2 flows more easily to the second iron core 10B than to the first iron core 10A. Thereby, iron loss can be effectively reduced.

  Note that the axial arrangement of the first iron core 10A described in the first modification (FIG. 11) or the second modification (FIG. 12) may be applied to the fourth embodiment. Further, the second iron core 10B is made of an amorphous metal or a nanocrystalline metal (thin laminate or powder compact), but is made of an electromagnetic steel sheet as in the second embodiment. Is also good. Further, as described in the third embodiment, the configuration of stator core 10 in which the inner peripheral end face of tooth tip 13A is located radially outward from the inner peripheral end face of tooth tip 13B (FIG. 14). Alternatively, the configuration of rotor core 21 of the fourth embodiment may be combined.

Embodiment 5 FIG.
FIG. 17 is a plan view showing a first configuration example of first iron core 10A of stator iron core 10 according to Embodiment 5 of the present invention. FIG. 17 shows a first iron core 10A corresponding to the first split iron core portion 5A.

  In the configuration example of FIG. 17, a long hole 300 (gap) is formed in the tooth tip 13A of the first iron core 10A. The long hole 300 is a hole extending in the circumferential direction. The elongated hole 300 has edges 301 and 302 extending in an arc shape on the radially outer side and the radially inner side, respectively, and a pair of edges 303 located at both circumferential ends of the edges 301 and 302. I have.

  FIG. 18 is a plan view showing a second configuration example of the first iron core 10A of the fifth embodiment. In the configuration example of FIG. 18, a plurality of holes 310 (voids) are formed in the tooth tip 13A instead of the long holes 300 shown in FIG. The hole 310 is, for example, a circular hole, but is not limited to a circular shape. The plurality of holes 310 are circumferentially arranged along the inner peripheral end surface of the tooth tip 13A.

  FIG. 19 is a plan view showing a third configuration example of the first iron core 10A of the fifth embodiment. In the configuration example of FIG. 19, a groove 320 (hollow portion) is formed on the inner peripheral end surface of the tooth tip 13A. The groove 320 has an edge 321 extending in the circumferential direction, and a pair of edges 322 located at both ends of the edge 321.

  FIG. 20 is a plan view showing a fourth configuration example of the first iron core 10A of the fifth embodiment. In the configuration example of FIG. 20, a plurality of grooves 330 (cavities) are formed in the inner peripheral end surface of the tooth tip 13A. The groove 330 is, for example, a semicircular groove, but is not limited to a semicircle. The plurality of grooves 330 are circumferentially arranged along the inner peripheral end face of the tooth tip 13A.

  The configuration of the electric motor according to the fifth embodiment is the same as that of the electric motor according to the first embodiment, except that a hollow portion is formed in tooth tip portion 13A of first iron core 10A.

  In the fifth embodiment, as shown in FIGS. 17 to 20, since a hollow portion is formed in tooth tip portion 13 </ b> A, the magnetic resistance of first iron core 10 </ b> A increases, and permanent magnet of rotor 2 increases. It becomes difficult for the magnetic flux of 25 to flow to the first iron core 10A. As a result, more magnetic flux of the permanent magnet 25 of the rotor 2 flows to the second iron core 10B (FIG. 2), and iron loss can be reduced.

  Further, since the inner diameter of the first iron core 10A and the inner diameter of the second iron core 10B can be made the same, the first iron core 10A and the second iron core 10B can be assembled on the basis of the inner diameter. The accuracy is improved.

  The shape of the cavity of the tooth tip 13A is not limited to the examples shown in FIGS. 17 to 20 and may be any shape that makes it difficult for the magnetic flux of the permanent magnet 25 of the rotor 2 to flow to the tooth tip 13A.

  Note that the axial arrangement of the first iron core 10A described in the first modification (FIG. 11) or the second modification (FIG. 12) may be applied to the fifth embodiment. Further, the second iron core 10B is made of an amorphous metal or a nanocrystalline metal (thin laminate or powder compact), but is made of an electromagnetic steel sheet as in the second embodiment. Is also good. Further, the configuration of stator core 10 described in Embodiment 3 (FIG. 14) may be applied, and the configuration of rotor core 21 described in Embodiment 4 (FIG. 16) may be applied.

Embodiment 6 FIG.
FIG. 21 is a plan view showing a first configuration example of first iron core 10A of stator iron core 10 according to Embodiment 6 of the present invention. FIG. 21 shows a first iron core 10A corresponding to the first split iron core portion 5A.

  In the configuration example of FIG. 21, three elongated holes 340 (cavities) extending in the radial direction are formed in the teeth 11A of the first iron core 10A. These three long holes 340 are arranged at intervals in the circumferential direction.

  Each long hole 340 has a pair of edges 341 extending in the radial direction and a pair of edges 342 extending in the circumferential direction. The number of the long holes 340 is not limited to three, and may be one or more. The long hole 340 extends over the entire area in the radial direction of the tooth 11A, that is, from the tooth tip 13A to the yoke 12A. However, the range in which the elongated holes 340 extend may be any range as long as the magnetic resistance of the teeth 11A can be increased.

  FIG. 22 is a plan view showing a second configuration example of the first iron core 10A of the sixth embodiment. In the configuration example of FIG. 22, four long holes 350 (cavities) extending in the circumferential direction are formed in the teeth 11A. The four long holes 350 are arranged at intervals in the radial direction.

  Each long hole 350 has a pair of edges 351 extending in the circumferential direction and a pair of edges 352 extending in the radial direction. The number of the long holes 350 is not limited to four, and may be one or more. The long hole 350 is formed over the entire area in the radial direction of the tooth 11A, that is, in a range from the tooth tip 13A to the yoke 12A. However, the range in which the long holes 350 are formed may be any range as long as the magnetic resistance of the teeth 11A can be increased.

  FIG. 23 is a plan view showing a third configuration example of the first iron core 10A according to the sixth embodiment. In the configuration example of FIG. 23, seven long holes 360 (cavities) extending in the radial direction are formed in the yoke 12A. The seven long holes 360 are arranged at intervals in the circumferential direction.

  Each long hole 360 has a pair of edges 361 extending in the radial direction and a pair of edges 362 extending in the circumferential direction. The number of the long holes 360 is not limited to seven, but may be one or more. The long hole 360 is formed over the entire area in the circumferential direction of the yoke 12A. However, the range in which the long hole 360 is formed may be any range as long as the magnetic resistance of the yoke 12A can be increased.

  FIG. 24 is a plan view showing a fourth configuration example of the first iron core 10A according to the sixth embodiment. In the configuration example of FIG. 24, two long holes 370 (cavities) extending in the circumferential direction are formed in the yoke 12A. The two long holes 370 are arranged at intervals in the radial direction.

  Each long hole 370 has a pair of edges 371 extending in the circumferential direction and a pair of edges 372 extending in the radial direction. The number of the long holes 370 is not limited to two, and may be one or more. The long hole 370 is formed over the entire area in the circumferential direction of the yoke 12A. However, the range in which the long holes 370 are formed may be any range as long as the magnetic resistance of the yoke 12A can be increased.

  FIG. 25 is a plan view showing another configuration example of the sixth embodiment. In the configuration example of FIG. 25, two L-shaped long holes 400 (hollow portions) and one T-shaped long hole 410 (hollow portions) are formed from the teeth 11A to the yoke 12A.

  The long hole 400 has a first portion 401 extending in the radial direction in the teeth 11A and a second portion 402 extending in the circumferential direction in the yoke 12A. Are connected at the ends. The first portion 401 extends along the side surface 111A of the tooth 11A, and the second portion 402 extends along the inner peripheral surface 121A of the yoke 12A.

  The long hole 410 has a first portion 411 extending in the tooth 11A in the radial direction and second portions 412 extending in the yoke 12A on both sides in the circumferential direction. The second portion 412 is connected to the center in the circumferential direction.

  In the teeth 11A, a first portion 411 of the long hole 410 is formed between the first portions 401 of the two long holes 400. In the yoke 12A, a second portion 412 of the long hole 410 is formed radially outside the second portion 402 of the long hole 400.

  Here, a total of three long holes (two long holes 400 and one long hole 410) are provided, but the number of long holes may be one or more. The range in which the long holes 400 and 410 are formed may be any range as long as the magnetic resistance of the teeth 11A and the yoke 12A can be increased.

  The configuration of the electric motor of the sixth embodiment is the same as that of the electric motor of the first embodiment except that a cavity is formed in at least one of teeth 11A and yoke 12A of first iron core 10A.

  In the sixth embodiment, as shown in FIGS. 21 to 25, since a cavity is formed in at least one of the teeth 11A and the yoke 12A, the magnetic resistance of the first iron core 10A increases, It becomes difficult for the magnetic flux of the permanent magnet 25 of the rotor 2 to flow to the first iron core 10A. As a result, more magnetic flux of the permanent magnet 25 of the rotor 2 flows to the second iron core 10B (FIG. 2), and iron loss can be reduced.

  The shapes of the cavities of the teeth 11A and the yoke 12A are not limited to the examples shown in FIGS. .

  Note that the axial arrangement of the first iron core 10A described in the first modification (FIG. 11) or the second modification (FIG. 12) may be applied to the sixth embodiment. Further, the second iron core 10B is made of an amorphous metal or a nanocrystalline metal (thin laminate or powder compact), but is made of an electromagnetic steel sheet as in the second embodiment. Is also good. Further, the configuration of stator core 10 described in Embodiment 3 (FIG. 14) may be applied, and the configuration of rotor core 21 described in Embodiment 4 (FIG. 16) may be applied.

<Rotary compressor>
Next, a rotary compressor 500 to which the electric motor 100 of each of the above-described embodiments and modifications is applicable will be described. FIG. 26 is a cross-sectional view illustrating a configuration of the rotary compressor 500. The rotary compressor 500 includes an airtight container 507, a compression element 501 provided in the airtight container 507, and the electric motor 100 that drives 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 (not shown) that divides the interior of the cylinder chamber 503 into a suction side and a compression side. And an upper frame 505 and a lower frame 506 into which the shaft 60 is inserted to close the axial end surface of the cylinder chamber 503. An upper discharge muffler 508 and a lower discharge muffler 509 are mounted on the upper frame 505 and the lower frame 506, respectively.

  The closed container 507 is a cylindrical container formed by drawing a 3 mm-thick steel plate, for example. Refrigeration oil (not shown) for lubricating each sliding portion of the compression element 501 is stored at the bottom of the sealed container 507. The shaft 60 is rotatably held by an upper frame 505 and a lower frame 506 as bearings.

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

  The closed container 507 has a cylindrical frame 6. The stator 1 of the electric 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 a glass terminal 511 fixed to the closed container 507. The shaft 60 is fixed to a center hole 26 formed at the center of the rotor core 21 (FIG. 1) of the rotor 2.

  An accumulator 510 that stores the refrigerant gas is mounted outside 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 via the suction pipe 513. Further, a discharge pipe 512 for discharging the refrigerant to the outside is provided on the upper part of the sealed container 507.

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

  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 together with the rotor 2. Then, the rolling piston 504 fitted to the shaft 60 rotates eccentrically 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 that has risen inside the closed container 507 is discharged from the discharge pipe 512 and supplied to the high-pressure side of the refrigeration cycle.

  The refrigerant compressed in the cylinder chamber 503 contains refrigerating machine oil. However, when the refrigerant passes through a hole provided in the rotor core 21, separation of the refrigerating machine oil from the refrigerant is promoted. Inflow to the discharge pipe 512 is prevented.

  The electric motor 100 described in each embodiment and each modified example can be applied to the rotary compressor 500, and the electric motor 100 has small iron loss and sufficient strength. Therefore, the energy efficiency and reliability of the rotary compressor 500 can be improved.

  In addition, the electric motor 100 of each 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 refrigeration / air-conditioning apparatus 600 including the rotary compressor 500 described above will be described. FIG. 27 is a diagram showing a configuration of the refrigeration / air-conditioning apparatus 600. The refrigeration / air-conditioning apparatus 600 shown in FIG. 27 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 form a refrigeration cycle.

  The operation of the refrigeration / air-conditioning apparatus 600 is as follows. The compressor 500 compresses the sucked refrigerant and sends it out as a high-temperature and high-pressure gas refrigerant. The four-way valve 601 switches the flow direction of the refrigerant. In the state shown in FIG. 27, the four-way valve 601 causes the refrigerant sent from the compressor 500 to flow to the condenser 602. The condenser 602 exchanges heat between the refrigerant sent from the compressor 500 and air (for example, outdoor air), condenses and liquefies the refrigerant, and sends it out. The decompression device 603 expands the liquid refrigerant sent from the condenser 602 and sends it out as a low-temperature and low-pressure liquid refrigerant.

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

  The electric motor 100 described in each embodiment and each modification can be applied to the compressor 500 of the refrigeration / air-conditioning apparatus 600, and the electric motor 100 has small iron loss and sufficient strength. Therefore, the energy efficiency and reliability of the refrigeration / air-conditioning device 600 can be improved.

  Note that components other than the compressor 500 in the refrigeration / air-conditioning apparatus 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 may be made without departing from the spirit of the present invention. be able to.

  Reference Signs List 1 stator, 2 rotor, 3 winding, 5 split core, 5A first split core, 5B, 5C second split core, 6 frame, 7 winding nozzle, 10 stator core, 10A first Iron core, 10B Second iron core, 11 teeth, 11A teeth (first teeth), 11B, 11C teeth (second teeth), 12 yokes, 12A yokes (first yokes), 12B, 12C yokes (first teeth) 2, 13A, 13B, 13C Teeth tip, 15 Connecting portion (caulking portion), 16A, 16B, 16C outer peripheral surface, 17A, 18A end surface (divided surface), 17B, 18B end surface, 21 rotor core , 21A first iron core, 21B second iron core, 22 magnet insertion hole, 23 flux barrier, 25 permanent magnet, 2 6 center hole, 30 insulator, 41, 42 fixing member, 60 shaft, 100 electric motor, 101, 102, 103 caulking portion, 105 hole, 201, 202 outer peripheral surface, 300 long hole (hollow portion), 310 hole (hollow portion) , 320, 330 Groove (cavity), 340, 350, 360, 370, 400, 410 Slot (cavity), 500 Rotary compressor (compressor), 600 Refrigeration air conditioner.

Claims (21)

A first iron core having a first yoke extending in a circumferential direction about an axis, and a first tooth extending from the first yoke toward the axis;
A second yoke adjacent to the first yoke in the direction of the axis, and a second iron core having a second tooth adjacent to the first tooth in the direction of the axis. ,
The first iron core is formed of a laminate of electromagnetic steel sheets,
The second iron core is formed of a laminate of a thin ribbon of an amorphous metal or a nanocrystalline metal, or a compression molded body of an amorphous metal or a nanocrystalline metal powder,
The first tooth has a first protruding portion that protrudes in the circumferential direction at an inner end portion in a radial direction about the axis,
The second tooth has a second protrusion protruding in the circumferential direction at an inner end in the radial direction,
The radial width of the first yoke is defined as Y1, the radial width of the second yoke is defined as Y2, the circumferential width of the first teeth is defined as T1, and the second teeth is defined as T1. Is defined as T2, at least one of Y1 <Y2 and T1 <T2 is satisfied,
The stator, wherein the radial width P1 of the first protrusion is smaller than the radial width P2 of the second protrusion. A first iron core having a first yoke extending in a circumferential direction about an axis, and a first tooth extending from the first yoke toward the axis;
A second yoke adjacent to the first yoke in the direction of the axis, and a second iron core having a second tooth adjacent to the first tooth in the direction of the axis. ,
The first iron core is formed of a laminate of a first electromagnetic steel sheet,
The second core is configured by a laminate of a second electromagnetic steel sheet that is thinner than the first electromagnetic steel sheet,
The first tooth has a first protruding portion that protrudes in the circumferential direction at an inner end portion in a radial direction about the axis,
The second tooth has a second protrusion protruding in the circumferential direction at an inner end in the radial direction,
The radial width of the first yoke is defined as Y1, the radial width of the second yoke is defined as Y2, the circumferential width of the first teeth is defined as T1, and the second teeth is defined as T1. Is defined as T2, at least one of Y1 <Y2 and T1 <T2 is satisfied,
The stator, wherein the radial width P1 of the first protrusion is smaller than the radial width P2 of the second protrusion. The stator according to claim 1, wherein a distance from the axis to the outer peripheral surface of the second yoke is smaller than a distance from the axis to the outer peripheral surface of the first yoke. The stator is attached to an inner peripheral side of a cylindrical frame,
The stator according to claim 3, wherein the first yoke is fitted to the frame, and the second yoke is separated from the frame. The stator according to any one of claims 1 to 4, wherein a distance from the axis to the first tooth is smaller than a distance from the axis to the second tooth. The stator according to any one of claims 1 to 5, 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 first core is disposed at least at both ends of the stator in the direction of the axis,
The stator according to any one of claims 1 to 6, wherein the second core is disposed so as to be sandwiched between the first cores. The stator according to any one of claims 1 to 7, wherein the second core is divided into two or more divided core portions that are separated from each other in a circumferential direction. The stator according to any one of claims 1 to 7, wherein the second core is divided into two or more divided core portions connected to each other on an outer peripheral side of the first yoke. The stator according to any one of claims 1 to 9, wherein a gap is formed in at least one of the first teeth and the first yoke. The stator according to claim 10, wherein the gap is formed at an inner end of the first tooth in the radial direction. The gap portion is a long hole extending in the circumferential direction, two or more holes arranged in the circumferential direction, a groove extending in the circumferential direction, or two or more grooves arranged in the circumferential direction. The stator according to claim 11. The stator according to claim 10, wherein the gap is a long hole formed in the first tooth and extending in the radial direction or the circumferential direction. The stator according to claim 10, wherein the gap is a long hole formed in the first yoke and extending in the radial direction or the circumferential direction. The said gap part is a long hole formed from the said 1st tooth to the said 1st yoke and having the part extended in the said radial direction, and the said circumferential direction. The stator according to 1. An electric motor comprising: the stator according to any one of claims 1 to 15; and a rotor provided inside the stator. The electric motor according to claim 16, wherein the rotor includes a rotor core and a permanent magnet attached to the rotor core. The rotor core has a first core facing the first teeth, and a second core corresponding to the second teeth,
The electric motor according to claim 17, wherein a distance from the axis to the outer peripheral surface of the first core is shorter than a distance from the axis to the outer peripheral surface of the second core. An electric motor, comprising a compression element driven by the electric motor,
A compressor comprising: the stator according to any one of claims 1 to 15; and a rotor provided inside the stator. Further comprising a cylindrical frame,
The compressor according to claim 19, wherein the first yoke is fitted to the frame, and the second yoke is separated from the frame. Equipped with a compressor, condenser, decompression device and evaporator,
The compressor includes an electric motor, and a compression element driven by the electric motor,
A refrigerating air conditioner, comprising: the motor according to any one of claims 1 to 15; and a rotor provided inside the stator.

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