[go: up one dir, main page]

WO2024150393A1 - Procédé de magnétisation, moteur électrique, compresseur et appareil à cycle de réfrigération - Google Patents

Procédé de magnétisation, moteur électrique, compresseur et appareil à cycle de réfrigération Download PDF

Info

Publication number
WO2024150393A1
WO2024150393A1 PCT/JP2023/000729 JP2023000729W WO2024150393A1 WO 2024150393 A1 WO2024150393 A1 WO 2024150393A1 JP 2023000729 W JP2023000729 W JP 2023000729W WO 2024150393 A1 WO2024150393 A1 WO 2024150393A1
Authority
WO
WIPO (PCT)
Prior art keywords
gap
magnetic body
stator core
shell
magnetization
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/000729
Other languages
English (en)
Japanese (ja)
Inventor
大輝 岩田
篤 松岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2023/000729 priority Critical patent/WO2024150393A1/fr
Publication of WO2024150393A1 publication Critical patent/WO2024150393A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets

Definitions

  • This disclosure relates to a magnetization method, an electric motor, a compressor, and a refrigeration cycle device.
  • a known method of magnetizing permanent magnets in electric motors is to incorporate the unmagnetized permanent magnet into the rotor of the electric motor and then pass a magnetizing current through the stator coil to magnetize the permanent magnet (see, for example, Patent Document 1).
  • This type of magnetization method is called built-in magnetization.
  • JP 2006-67772 A (see FIG. 9)
  • stator cores are provided with notches that serve as refrigerant passages for the compressor, and it is often not possible to ensure a magnetic path of sufficient width.
  • the purpose of this disclosure is to improve the magnetization rate of permanent magnets by providing a magnetic path in the stator core that is wide enough for magnetizing magnetic flux to flow.
  • the magnetization method disclosed herein is a magnetization method for magnetizing the permanent magnets of an electric motor.
  • the electric motor includes a rotor having a shaft and a permanent magnet, and a stator that surrounds the rotor and is fixed inside a cylindrical shell.
  • the stator has a stator core and a winding wound around the stator core.
  • a gap is formed at least between the stator core and the shell and inside the stator core.
  • the magnetization method includes a step of inserting a magnetic body into the gap, a step of passing a magnetizing current through the winding, and a step of removing the magnetic body from the gap.
  • the magnetizing magnetic flux generated by the magnetizing current flows not only through the stator core, but also through the magnetic material inserted in the gap. This makes it possible to provide a magnetic path in the stator that is wide enough for the magnetizing magnetic flux to flow, thereby improving the magnetization rate of the permanent magnet.
  • FIG. 1 is a cross-sectional view showing an electric motor according to a first embodiment of the present invention
  • 1 is a cross-sectional view showing a rotor according to a first embodiment of the present invention
  • FIG. 2 is a top view showing the stator of the first embodiment.
  • 1A is a diagram showing a magnetizing device of embodiment 1
  • FIG. 1B is a graph showing a magnetizing current.
  • 4 is a flowchart showing a magnetizing method according to the first embodiment.
  • 1 is a cross-sectional view showing a state in which a magnetic body is inserted into a gap between a notch in a stator core and a shell in the magnetization method of embodiment 1.
  • FIG. 1A is an enlarged cross-sectional view showing a gap between a notch of a stator core and a shell in the first embodiment
  • FIG. 1B is an enlarged cross-sectional view showing a state in which a magnetic body is inserted into the gap.
  • 1A and 1B are perspective views showing two examples of a magnetic body in the magnetization method of embodiment 1.
  • 10 is a cross-sectional view showing another example in which a magnetic body is inserted into a gap between a notch in a stator core and a shell in the magnetization method of embodiment 1.
  • FIG. 1A is an enlarged cross-sectional view showing a gap between a notch of a stator core and a shell in the first embodiment
  • FIG. 1B is an enlarged cross-sectional view showing a state in which a magnetic body is inserted into the gap.
  • 1A and 1B are perspective views showing two examples of a magnetic body in the magnetization method of embodiment 1.
  • 10 is a cross-sectional view showing another example
  • FIG. 1 is a graph showing a comparison of magnetization rates obtained by the magnetization method according to a comparative example and the magnetization method according to the first embodiment
  • 1A and 1B are magnetic flux diagrams illustrating a comparison of distributions of magnetization magnetic flux obtained by the magnetization method of a comparative example and the magnetization method of the first embodiment
  • 1A is a perspective view showing a shaft fixing jig used in a modified example of the first embodiment
  • FIG. 13 is a flowchart showing a magnetization method in the case where a shaft fixing jig according to a modified example of the first embodiment is used.
  • FIG. 11 is a top view showing a stator according to a second embodiment.
  • FIG. 11 is a cross-sectional view showing a state in which a magnetic body is inserted into a through hole of a stator core in a magnetizing method of embodiment 2.
  • FIG. 11 is a top view showing a stator according to a third embodiment.
  • 13 is a cross-sectional view showing a state in which a magnetic body is inserted into a gap between a notch in the stator core and a shell and into a through hole in the stator core in the magnetization method of embodiment 3.
  • FIG. 1 is a diagram showing a compressor to which the electric motors of the respective embodiments and modified examples can be applied;
  • FIG. 19 is a diagram showing a refrigeration cycle device having the compressor of FIG. 18.
  • Embodiment 1 is a cross-sectional view showing an electric motor 100 according to embodiment 1.
  • the electric motor 100 according to embodiment 1 has a rotatable rotor 3 and a stator 1 surrounding the rotor 3. An air gap is provided between the stator 1 and the rotor 3.
  • FIG. 1 shows a cross section perpendicular to the axial direction.
  • FIG. 2 is a cross-sectional view showing the rotor 3.
  • the rotor 3 has a rotor core 30 and a permanent magnet 40 attached to the rotor core 30.
  • the rotor core 30 has a cylindrical shape centered on the axis Ax.
  • the rotor core 30 is made by laminating electromagnetic steel sheets in the axial direction and fixing them together by caulking, rivets, or the like.
  • the thickness of the electromagnetic steel sheets is, for example, 0.1 to 0.7 mm.
  • the rotor core 30 has an outer periphery 30a and a central hole 30b.
  • the shaft 45 is fixed into the central hole 30b of the rotor core 30 by press fitting.
  • the central axis of the shaft 45 defines the axis line Ax described above.
  • the rotor core 30 has multiple magnet insertion holes 31 along the outer periphery 30a.
  • six magnet insertion holes 31 are arranged at equal intervals in the circumferential direction.
  • One permanent magnet 40 is placed in each magnet insertion hole 31.
  • Each permanent magnet 40 constitutes one magnetic pole. Since there are six permanent magnets 40, the rotor 3 has six poles. However, the number of poles of the rotor 3 is not limited to six, and may be two or more. In addition, two or more permanent magnets 40 may be placed in one magnet insertion hole 31, and one magnetic pole may be constituted by the two or more permanent magnets 40.
  • each magnet insertion hole 31 is the pole center.
  • a radial line passing through the pole center is the magnetic pole center line C.
  • the magnetic pole center line C is the d-axis of the rotor 3.
  • the space between adjacent magnet insertion holes 31 is the inter-pole portion N.
  • the permanent magnet 40 is a flat plate-shaped member that has a width in the circumferential direction and a thickness in the radial direction.
  • the permanent magnet 40 is a neodymium rare earth magnet that contains neodymium (Nd), iron (Fe) and boron (B), and may further contain heavy rare earth elements such as dysprosium (Dy) or terbium (Tb).
  • the permanent magnet 40 is magnetized in its thickness direction, i.e., in the radial direction.
  • the magnetization directions of adjacent permanent magnets 40 in the circumferential direction are opposite to each other.
  • Flux barriers 32 are formed at both circumferential ends of the magnet insertion hole 31.
  • the flux barriers 32 are holes that extend radially from the circumferential ends of the magnet insertion hole 31 toward the outer periphery of the rotor core 30.
  • the flux barriers 32 act to suppress leakage flux between adjacent magnetic poles.
  • Slits 33 are formed on the radial outside of the magnet insertion hole 31.
  • eight radially long slits 33 are formed symmetrically with respect to the magnetic pole center line C.
  • two circumferentially long side slits 34 are formed on both circumferential sides of the eight slits 33.
  • the number and arrangement of the slits 33 are arbitrary. Also, there are cases where the rotor core 30 does not have the slits 33 and the side slits 34.
  • the crimped portion 39 that integrally fastens the electromagnetic steel plates that make up the rotor core 30 is formed on a radial straight line that passes through the inter-pole portion N.
  • the arrangement of the crimped portion 39 is not limited to this position.
  • a through hole 36 is formed radially inward of the magnet insertion hole 31, and a through hole 37 is formed radially inward of the crimped portion 39. Furthermore, through holes 38 are formed on both circumferential sides of the crimped portion 39. All of the through holes 36, 37, and 38 pass through the rotor core 30 in the axial direction and are used as refrigerant passages or rivet holes. The arrangement of the through holes 36, 37, and 38 is not limited to these positions. Furthermore, the rotor core 30 may not have the through holes 36, 37, and 38.
  • FIG. 3 is a top view showing the stator 1.
  • the stator 1 has an annular stator core 10 centered on the axis Ax, and a winding 20 wound around the stator core 10.
  • the stator core 10 is made by stacking multiple electromagnetic steel plates in the axial direction and fixing them together by crimping or the like.
  • the thickness of the electromagnetic steel plates is, for example, 0.1 to 0.7 mm.
  • the stator core 10 has an annular core back 11 and a number of teeth 12 extending radially inward from the core back 11.
  • the core back 11 has an outer peripheral surface 14 that extends in an arc shape centered on the axis Ax.
  • the outer peripheral surface 14 of the core back 11 fits into the inner peripheral surface 81 of a cylindrical shell 80.
  • the shell 80 is part of the compressor 8 ( Figure 4 (A)) and is made of a magnetic material.
  • the teeth 12 are formed at equal intervals in the circumferential direction.
  • a tooth tip portion with a wide circumferential width is formed at the radially inner tip of the teeth 12.
  • the tooth tip portion of the teeth 12 faces the rotor 3 ( Figure 2).
  • Windings 20 are wound around the teeth 12 in a distributed winding manner.
  • the number of teeth 12 is 18 here, but it can be two or more.
  • a slot 13 is formed between adjacent teeth 12.
  • the number of slots 13 is the same as the number of teeth 12, which is 18 in this example.
  • the slots 13 house the windings 20.
  • a notch 15 is formed on the outer peripheral surface 14 of the core back 11.
  • the notch 15 extends linearly in a plane perpendicular to the axial direction.
  • the notch 15 also extends from one end to the other end of the stator core 10 in the axial direction.
  • the notches 15 are formed in four locations at 90 degree intervals centered on the axis Ax.
  • the number and arrangement of the notches 15 are not limited to this example.
  • a gap 17 is formed between the notches 15 and the inner circumferential surface 81 of the shell 80, and this gap 17 serves as a refrigerant passage in the compressor.
  • the windings 20 are wound around the teeth 12 in a distributed winding manner.
  • the windings 20 are three-phase windings having winding sections for U-phase, V-phase, and W-phase.
  • the coils that make up the windings 20 are made of aluminum wire or copper wire.
  • the windings 20 and the stator core 10 are insulated from each other by an insulating section (not shown) made of resin.
  • Fig. 4(A) is a diagram showing a magnetizing device for magnetizing the permanent magnet 40.
  • the permanent magnet 40 is magnetized in a state in which the electric motor 100 is assembled inside the shell 80 of the compressor 8. In other words, assembled magnetization is performed.
  • the permanent magnet 40 before magnetization is made of a magnetic material, for convenience of explanation, it will be referred to as a "permanent magnet”.
  • the motor 100 is installed inside the shell 80 with a portion of the sealed container of the compressor 8 (for example, the upper container portion 312 shown in FIG. 18) removed and the axial end of the shell 80 open.
  • the magnetization power supply 85 is connected to the winding 20 of the electric motor 100 in the compressor 8 by wiring L1 and L2.
  • the magnetization power supply 85 applies a magnetization voltage to the winding 20, which causes a magnetization current to flow through the winding 20 and generates a magnetization magnetic flux.
  • the magnetization current has a waveform with a high peak of, for example, several kA, as shown in an example in Figure 4 (B).
  • ⁇ Magnetization method> 5 is a flowchart showing the magnetization method of embodiment 1.
  • step ST11 the winding 20 is wound around the stator core 10 via an insulating portion to assemble the stator 1.
  • the shaft 45 is fixed in the central hole 30b of the rotor core 30, and the unmagnetized permanent magnets 40 are inserted into the magnet insertion holes 31 to assemble the rotor 3.
  • step ST12 the stator 1 is fixed to the inside of the shell 80 of the compressor 8.
  • the stator 1 is fixed by, for example, shrink fitting.
  • the outer peripheral surface 14 of the stator core 10 fits into the inner peripheral surface 81 of the shell 80, as shown in FIG. 3.
  • a gap 17 is formed between the notch 15 of the stator core 10 and the inner peripheral surface 81 of the shell 80.
  • step ST13 the rotor 3 is inserted inside the stator 1 in the shell 80 of the compressor 8.
  • the lower end of the shaft 45 is rotatably supported by a subframe (not shown) of the compressor 8 (for example, the subframe 306 shown in FIG. 18).
  • step ST14 the circumferential position (also called the phase) of the rotor 3 relative to the stator 1 is adjusted, and then the shaft 45 is fixed so that it does not rotate.
  • the phase of the rotor 3 is adjusted so that the magnetic flux flowing into the rotor 3 from the teeth 12 of the stator 1 flows as parallel as possible to the magnetization easy direction of the permanent magnet 40 (here, the thickness direction).
  • the shaft 45 is fixed, for example, by inserting a shaft fixing jig as shown by arrow J.
  • a specific example of the shaft fixing jig will be described later with reference to Figures 12 (A) and (B).
  • the rotor 3 is also fixed so that it does not rotate.
  • a magnetic body 61 is inserted into the gap 17 between the notch 15 of the stator core 10 and the shell 80.
  • the magnetic body 61 is a columnar member whose axial direction is the axis line Ax, and is made of a magnetic material. It is preferable that the magnetic body 61 is a laminate in which electromagnetic steel sheets are stacked in the axial direction.
  • Figure 7 (A) is an enlarged cross-sectional view of the gap 17.
  • the gap 17 is a gap formed between the notch 15 of the stator core 10 and the inner peripheral surface 81 of the shell 80.
  • the gap 17 has a cross-sectional area S1 in a plane perpendicular to the axial direction.
  • FIG. 7(B) is a cross-sectional view showing the state in which the magnetic body 61 is inserted into the gap 17.
  • the magnetic body 61 has a cross-sectional area S2 in a plane perpendicular to the axial direction.
  • the cross-sectional area S1 of the gap 17 and the cross-sectional area S2 of the magnetic body 61 satisfy S1 ⁇ S2. In other words, the magnetic body 61 can be inserted into the gap 17.
  • FIG. 8(A) is a perspective view showing an example of the three-dimensional shape of the magnetic body 61.
  • the magnetic body 61 has a flat surface 61a and a curved surface 61b.
  • the flat surface 61a of the magnetic body 61 faces the notch 15 of the stator core 10.
  • the curved surface 61b of the magnetic body 61 faces the inner circumferential surface 81 of the shell 80.
  • the shape of the magnetic body 61 is not limited to the shape shown in FIG. 8(A), and may be any shape that allows it to be inserted into the gap 17 between the notch 15 of the stator core 10 and the shell 80.
  • step ST16 (Fig. 5) a magnetizing current is passed from the magnetizing power supply 85 (Fig. 4(A)) to the winding 20 of the motor 100.
  • the magnetizing current flowing through the winding 20 generates a magnetizing magnetic flux, which flows through the stator core 10.
  • step ST17 the magnetic body 61 is removed from the gap 17.
  • the magnetic body 61 is removed by pulling the magnetic body 61 out of the gap 17 in the axial direction.
  • step ST18 the shaft fixing jig described above is removed, and the shaft 45 is released from its fixed position. This completes the magnetization of the permanent magnets 40 of the electric motor 100.
  • step ST19 a compression mechanism (e.g., compression mechanism 305 shown in FIG. 18) is attached to the upper end of shaft 45, and then shell 80 is sealed. This completes compressor 8 including motor 100.
  • a compression mechanism e.g., compression mechanism 305 shown in FIG. 18
  • step ST17 the magnetic body 61 is removed from the gap 17 between the notch 15 of the stator core 10 and the shell 80, so that the gap 17 can be used as a refrigerant passage in the compressor 8.
  • step ST15 the step of inserting the magnetic body 61 into the gap 17 (step ST15) is performed after the step of fixing the shaft 45 (step ST14), but these steps may be performed in the opposite order.
  • the shaft 45 may be fixed after the magnetic body 61 is inserted into the gap 17.
  • the core back 11 of the stator core 10 is provided with a notch 15 which serves as a refrigerant passage, and the width of the core back 11 is narrowed at that portion.
  • the magnetic path through which the magnetizing magnetic flux flows becomes narrower, and it becomes impossible to pass a sufficient amount of magnetizing magnetic flux.
  • a measure to increase the magnetizing current can be considered, but this is not preferable in terms of deformation of the winding 20 or insulation breakdown.
  • the magnetic body 61 is disposed between the notch 15 of the stator core 10 and the shell 80. Therefore, the magnetization magnetic flux flowing through the core back 11 also flows through the magnetic body 61.
  • the magnetizing magnetic flux flows through the magnetic body 61, ensuring a magnetic path of sufficient width within the stator core 10. This allows more magnetizing magnetic flux to link with the permanent magnets 40 of the rotor 3, improving the magnetization rate.
  • the magnetic body 61 is made of a laminate of electromagnetic steel sheets, the magnetic properties of the stator core 10 and the magnetic body 61 are similar, so the magnetization magnetic flux flows easily, and the generation of eddy currents within the magnetic body 61 can be suppressed.
  • the magnetic body 61 In order to efficiently pass a magnetizing current through the magnetic body 61 during the magnetizing process, it is desirable for the magnetic body 61 to be in contact with the notch 15 of the stator core 10. On the other hand, it is desirable that a large pulling force is not required when removing the magnetic body 61 from the gap 17. Therefore, it is desirable for the magnetic body 61 to be inserted between the notch 15 of the stator core 10 and the shell 80 with minimal backlash.
  • the magnetic body 61 is not limited to the above-mentioned shape, and other shapes can also be adopted.
  • Fig. 8(B) is a perspective view showing the three-dimensional shape of another example of the magnetic body 61 (referred to as magnetic body 62).
  • the magnetic body 62 shown in Fig. 8(B) is a flat plate-shaped member having mutually opposing flat surfaces 62a, 62b, and is made of a magnetic material.
  • FIG. 9 is a cross-sectional view showing the state in which the magnetic body 62 is inserted into the gap 17 between the notch 15 of the stator core 10 and the shell 80.
  • the flat surface 62a of the magnetic body 62 contacts the notch 15 of the stator core 10.
  • the flat surface 62b of the magnetic body 62 contacts the inner peripheral surface 81 of the shell 80 at both ends in the width direction.
  • the magnetic body 62 is also desirably a laminate in which electromagnetic steel sheets are stacked in the axial direction.
  • Figure 10 is a graph showing a comparison of the magnetization rate obtained by the magnetization method of the comparative example and the magnetization method of embodiment 1.
  • the permanent magnet 40 is magnetized without inserting the magnetic body 61 into the gap 17 between the notch 15 of the stator core 10 and the shell 80.
  • the permanent magnet 40 is magnetized by steps ST1 to ST14 and ST16 to ST19 shown in Figure 5.
  • the vertical axis of Figure 10 indicates the magnetization rate [%], and the horizontal axis indicates the magnetomotive force [kA ⁇ T].
  • the magnetization rate [%] indicates the degree of magnetization when complete magnetization is taken as 100 [%].
  • the magnetomotive force [kA ⁇ T] is the product of the current [kA] flowing through the winding 20 and the number of turns [T] of the winding 20, and is also called an ampere turn.
  • Figure 11(A) is a magnetic flux diagram showing the distribution of magnetization magnetic flux in the magnetization process of the comparative example.
  • Figure 11(B) is a magnetic flux diagram showing the distribution of magnetization magnetic flux in the magnetization process of embodiment 1.
  • magnetic body 61 is not inserted into gap 17, and in Figure 11(B), magnetic body 61 is inserted into gap 17.
  • the magnetization method of the first embodiment includes the steps of inserting the magnetic body 61 into the gap 17 between the notch 15 of the stator core 10 and the shell 80, passing a magnetizing current through the winding 20, and taking out the magnetic body 61 from the gap 17. Since the magnetizing magnetic flux generated by the magnetizing current flows not only through the stator core 10 but also through the magnetic body 61, a magnetic path of sufficient width can be secured within the stator core 10. This allows more magnetizing magnetic flux to link with the permanent magnet 40, improving the magnetization rate of the permanent magnet 40.
  • the magnetic body 61 is removed from the gap 17, so that the gap 17 can be used as a refrigerant passage in the compressor 8.
  • the cross-sectional area S1 of the gap 17 and the cross-sectional area S2 of the magnetic body 61 satisfy S1 ⁇ S2, so the magnetic body 61 can be inserted into the gap 17.
  • the magnetic body 61 is made of a laminate of electromagnetic steel sheets, magnetic flux flows easily within the magnetic body 61, and the generation of eddy currents within the magnetic body 61 can be suppressed.
  • the magnetic body 61 since the magnetic body 61 is inserted into the gap 17 from one axial end of the shell 80, the magnetic body 61 can be inserted into the gap 17 while the stator 1 is fixed inside the shell 80.
  • the process includes a step of adjusting the rotational position of the rotor 3 and fixing the shaft 45 before or after the step of inserting the magnetic body 61 into the gap 17, so that the rotor 3 can be prevented from rotating during magnetization.
  • Fig. 12(A) is a perspective view showing a shaft fixing jig 60 of the modified example together with the shaft 45.
  • Fig. 12(B) is a bottom view showing the shaft fixing jig 60.
  • the shaft fixing jig 60 has four magnetic bodies 62 as described in the first embodiment and a disk-shaped support plate 63 to which they are fixed.
  • the outer diameter of the support plate 63 is slightly smaller than the inner diameter of the shell 80 of the compressor 8 shown in FIG. 4(A).
  • a central hole 63a into which the shaft 45 fits is formed at the radial center of the support plate 63.
  • the shaft fixing jig 60 is inserted axially from the open end of the shell 80 as shown by arrow J in Figure 4 (A) and fits inside the shell 80.
  • the number of magnetic bodies 62 is the same as the number of notches 15 in the stator core 10. In this example, four magnetic bodies 62 are arranged at equal intervals in the circumferential direction. In addition, the distance from the center of the support plate 63 to each magnetic body 62 is equal to the distance from the axis Ax to the notch 15 in the stator core 10.
  • FIG. 13 is a flowchart showing a magnetization method when using a modified shaft fixing jig 60. Steps ST11 to ST13 are the same as steps ST11 to ST13 (FIG. 5) described in embodiment 1.
  • step ST20 the phase of the rotor 3 is adjusted and the shaft 45 is fixed.
  • the shaft 45 is fixed by fitting the shaft fixing jig 60 to the inside of the shell 80 (FIG. 4(A)) and fitting the shaft 45 into the central hole 63a of the support plate 63.
  • the magnetic body 62 fixed to the support plate 63 of the shaft fixing jig 60 is inserted into the gap 17 between the notch 15 of the stator core 10 and the shell 80.
  • step ST20 the shaft 45 is fixed and the magnetic body 62 is inserted into the gap 17 at the same time.
  • steps ST14 and ST15 (FIG. 5) in embodiment 1 are performed in the same process.
  • step ST16 is the same as step ST16 ( Figure 5) described in embodiment 1.
  • step ST21 the shaft fixing jig 60 is removed axially from the shell 80. This releases the shaft 45 from its fixed position, and at the same time, the magnetic body 62 is removed from the gap 17.
  • steps ST17 and ST18 (FIG. 5) in the first embodiment are performed in the same process.
  • step ST19 is the same as step ST19 ( Figure 5) described in embodiment 1.
  • the fixing of the shaft 45 and the insertion of the magnetic body 62 into the gap 17 are performed in the same process, and the release of the fixing of the shaft 45 and the removal of the magnetic body 62 from the gap 17 are performed in the same process. Therefore, compared to the first embodiment, the magnetization process can be made simpler.
  • FIG. 14 is a cross-sectional view showing a stator 1A of the second embodiment.
  • the stator 1A has a stator core 10 and a winding 20, and the stator core 10 has a core back 11 and teeth 12.
  • the core back 11 does not have the notch 15 described in the first embodiment, but has a through hole 16.
  • the through holes 16 are provided so as to penetrate the stator core 10 in the axial direction.
  • multiple through holes 16 are formed at equal intervals in the circumferential direction.
  • the number of through holes 16 is four here, but it may be three or less or five or more.
  • the through holes 16 become the refrigerant passages for the compressor.
  • the through holes 16 are arranged, for example, on a radial line passing through the widthwise center of the teeth 12. In this case, when the electric motor 100 is driven, the magnetic flux flowing from the teeth 12 to the core back 11 is divided into two circumferential directions at the position of the through holes 16, so the through holes 16 are unlikely to impede the flow of magnetic flux.
  • the arrangement of the through holes 16 is not limited to this position.
  • Each through hole 16 has a cross-sectional area S3 in a plane perpendicular to the axial direction.
  • the cross-sectional shape of the through hole 16 is circular here, but it may be other shapes, such as an ellipse or a slit shape.
  • FIG. 15 is a cross-sectional view showing the state in which the magnetic body 65 is inserted into the through-hole 16 of the stator core 10.
  • the magnetic body 65 is a columnar member whose axial direction is the axis line Ax, and is made of a magnetic material.
  • the magnetic body 65 be cylindrical.
  • the magnetic body 65 is not limited to being cylindrical, and may have any shape that can be inserted into the through-hole 16.
  • the magnetic body 65 is preferably a laminate of electromagnetic steel sheets stacked in the axial direction, similar to the magnetic bodies 61 and 62 of the first embodiment. If the magnetic body 65 is a laminate of electromagnetic steel sheets, the magnetic flux can easily flow within the magnetic body 65, and the generation of eddy currents within the magnetic body 65 can be suppressed.
  • the magnetic body 65 has a cross-sectional area S4 in a plane perpendicular to the axial direction.
  • the cross-sectional area S3 of the through hole 16 and the cross-sectional area S4 of the magnetic body 65 satisfy S3 ⁇ S4. In other words, the magnetic body 65 can be inserted into the through hole 16.
  • a step of inserting magnetic material 65 into through hole 16 of stator core 10 is performed instead of the step of inserting magnetic material 61 into gap 17 (step ST15 in FIG. 5).
  • step ST16 in FIG. 5 a magnetization current is passed through the winding 20, causing the magnetization magnetic flux to flow within the stator core 10.
  • the magnetic body 65 is inserted into the through hole 16, the magnetic flux flowing through the core back 11 also flows through the magnetic body 65. Since a magnetic path of sufficient width is secured in the stator core 10, more magnetization magnetic flux can be linked to the permanent magnets 40 of the rotor 3.
  • a process of removing the magnetic body 65 from the through hole 16 is performed.
  • the magnetic body 65 is removed by pulling it out of the through hole 16 in the axial direction.
  • the subsequent processes are the same as steps ST18 and ST19 shown in FIG. 5.
  • the magnetic body 65 In order to efficiently pass a magnetizing current through the magnetic body 65 during the magnetizing process, it is desirable for the magnetic body 65 to be in contact with the inner surface of the through hole 16. On the other hand, it is desirable that a large pulling force is not required when removing the magnetic body 65 from the through hole 16. For this reason, it is desirable for the magnetic body 65 to be inserted into the through hole 16 of the stator core 10 with minimal backlash.
  • the magnetization process is performed by inserting the magnetic body 65 into the through hole 16 in the stator core 10, so the magnetization magnetic flux flows not only through the stator core 10 but also through the magnetic body 65. Because a magnetic path of sufficient width is secured within the stator core 10, more magnetization magnetic flux can be linked to the permanent magnet 40, thereby improving the magnetization rate of the permanent magnet 40.
  • the shaft fixing jig 60 shown in Figures 12(A) and (B) may be used. Also, as shown in step ST20 in Figure 13, fixing the shaft 45 and inserting the magnetic body 65 into the through hole 16 may be performed in the same step, and as shown in step ST21, releasing the fixing of the shaft 45 and removing the magnetic body 65 from the through hole 16 may be performed in the same step.
  • Fig. 16 is a cross-sectional view showing a stator 1B of the third embodiment.
  • the stator 1B has a stator core 10 and a winding 20, and the stator core 10 has a core back 11 and teeth 12.
  • the core back 11 is formed with the notch 15 described in the first embodiment and the through hole 16 described in the second embodiment.
  • a gap 17 is formed between the notch 15 in the core back 11 and the shell 80.
  • the gap 17 is also referred to as a first gap.
  • the shape and arrangement of the through holes 16 in the core back 11 are as described in the second embodiment.
  • the through holes 16 in the core back 11 are also referred to as second gaps. Both the gaps 17 and the through holes 16 serve as refrigerant passages for the compressor.
  • the core back 11 has the same number of notches 15 and through holes 16, for example, four of each.
  • the notches 15 and through holes 16 are arranged alternately in the circumferential direction. By arranging the notches 15 and through holes 16 alternately in the circumferential direction, it is possible to prevent the occurrence of locally narrow portions of the core back 11.
  • the number and arrangement of the notches 15 and through holes 16 are not limited to the example described here.
  • FIG. 15 is a cross-sectional view showing the state in which magnetic body 61 is inserted into gap 17 between notch 15 of stator core 10 and shell 80, and magnetic body 65 is inserted into through hole 16, during the magnetization process of permanent magnet 40.
  • the shape of magnetic body 61 is as described in embodiment 1.
  • the shape of magnetic body 65 is as described in embodiment 2.
  • a step of inserting magnetic body 65 into through hole 16 of stator core 10 is further performed.
  • a magnetization current is passed through the winding 20, causing the magnetization magnetic flux to flow within the stator core 10.
  • the magnetic bodies 61, 65 are inserted into the gap 17 and through hole 16, the magnetic flux flowing through the core back 11 also flows through the magnetic bodies 61, 65. Because a magnetic path of sufficient width is secured in the stator core 10, more magnetization magnetic flux can be linked to the permanent magnets 40 of the rotor 3.
  • the magnetic body 65 is further removed from the through hole 16 of the stator core 10.
  • the subsequent processes are the same as steps ST18 and ST19 shown in FIG. 5.
  • the magnetization process is performed by inserting the magnetic body 61 into the gap between the notch 15 of the stator core 10 and the shell 80, and then inserting the magnetic body 65 into the through hole 16 in the stator core 10. Therefore, the magnetization magnetic flux flows not only through the stator core 10 but also through the magnetic bodies 61 and 65. As a sufficient magnetic path is secured within the stator core 10, more magnetization magnetic flux can be linked to the permanent magnet 40, thereby improving the magnetization rate of the permanent magnet 40.
  • the magnetic body 61 may be replaced by the magnetic body 62 shown in FIG. 8(B).
  • the shaft fixing jig 60 shown in FIGS. 12(A) and (B) may also be used.
  • the fixing of the shaft 45 and the insertion of the magnetic bodies 61 and 65 into the gap 17 and through hole 16 may be performed in the same step, as in step ST20, and the release of the fixing of the shaft 45 and the removal of the magnetic bodies 61 and 65 from the gap 17 and through hole 16 may be performed in the same step, as in step ST21.
  • a compressor 300 to which the electric motors of the above-mentioned embodiments and modifications can be applied will be described.
  • Fig. 18 is a cross-sectional view showing the compressor 300.
  • the compressor 300 is the compressor 8 shown in Fig. 4(A).
  • the compressor 300 is a scroll compressor in this embodiment, but is not limited thereto.
  • the compressor 300 includes a compression mechanism 305, an electric motor 100 that drives the compression mechanism 305, a subframe 306 that supports the lower end of the shaft 45 of the electric motor 100, and a sealed container 310 that houses these.
  • the sealed container 310 has a cylindrical shell 311, a container upper part 312 that covers the upper part of the shell 311, and a container bottom part 313 that covers the lower part of the shell 311.
  • the shell 311 corresponds to the shell 80 shown in FIG. 1.
  • the compression mechanism 305 includes a fixed scroll 301, an orbiting scroll 302, a compliant frame 303, and a guide frame 304. Both the fixed scroll 301 and the orbiting scroll 302 have plate-shaped spiral teeth, and are combined to form a compression chamber between them.
  • the compliant frame 303 holds the upper end of the shaft 45.
  • the guide frame 304 is fixed to the shell 311 and holds the compliant frame 303.
  • the fixed scroll 301 has a discharge port 301a that discharges the refrigerant compressed in the compression chamber.
  • a suction pipe 307 that penetrates the shell 311 is press-fitted into the fixed scroll 301.
  • a discharge pipe 308 is provided that penetrates the sealed container 310 and discharges the high-pressure refrigerant gas discharged from the discharge port 301a of the fixed scroll 301 to the outside.
  • the stator 1 of the electric motor 100 is fitted and fixed inside the shell 311.
  • the configuration of the electric motor 100 is as described above.
  • the glass terminal 309 that supplies power to the electric motor 100 is fixed to the shell 311 by welding.
  • the wiring L1 and L2 shown in FIG. 4(A) are connected to the glass terminal 309 as a terminal portion.
  • the operation of the compressor 300 is as follows.
  • the shaft 45 rotates together with the rotor 3.
  • the oscillating scroll 302 oscillates, changing the volume of the compression chamber between the fixed scroll 301 and the oscillating scroll 302.
  • refrigerant gas is sucked into the compression chamber from the suction pipe 307 and compressed.
  • the high-pressure refrigerant gas compressed in the compression chamber between the scrolls 301 and 302 is discharged from the discharge port 301a of the fixed scroll 301 into the sealed container 310, and then discharged to the outside through the discharge pipe 308.
  • a portion of the refrigerant gas discharged from the compression chamber into the sealed container 310 passes through the gap between the stator core 10 and the shell 311 (for example, the gap 17 shown in FIG. 1) or the gap in the stator core 10 (for example, the through hole 16 shown in FIG. 14), and cools the electric motor 100.
  • the electric motor 100 described in each embodiment and modification can be applied to the electric motor 100 of the compressor 300.
  • the electric motor 100 has high motor efficiency due to the improved magnetization rate of the permanent magnet 40. Therefore, the operating efficiency of the compressor 300 can be improved.
  • a refrigeration cycle apparatus 400 having the compressor 300 shown in Fig. 18 will be described.
  • Fig. 19 is a diagram showing the refrigeration cycle apparatus 400.
  • the refrigeration cycle apparatus 400 is, for example, an air-conditioning apparatus, but is not limited thereto.
  • the refrigeration cycle device 400 shown in FIG. 19 includes a compressor 401, a condenser 402 that condenses the refrigerant, a pressure reducing device 403 that reduces the pressure of the refrigerant, and an evaporator 404 that evaporates the refrigerant.
  • the compressor 401, the condenser 402, and the pressure reducing device 403 are provided in the indoor unit 410, and the evaporator 404 is provided in the outdoor unit 420.
  • the compressor 401, condenser 402, pressure reducing device 403, and evaporator 404 are connected by refrigerant piping 407 to form a refrigerant circuit.
  • the compressor 401 is formed by the compressor 300 shown in FIG. 18.
  • the refrigeration cycle device 400 also includes an outdoor blower 405 facing the condenser 402, and an indoor blower 406 facing the evaporator 404.
  • the operation of the refrigeration cycle device 400 is as follows.
  • the compressor 401 compresses the sucked refrigerant and sends it out as high-temperature, high-pressure refrigerant gas.
  • the condenser 402 exchanges heat between the refrigerant sent out from the compressor 401 and the outdoor air sent by the outdoor blower 405, condenses the refrigerant, and sends it out as liquid refrigerant.
  • the pressure reducing device 403 expands the liquid refrigerant sent out from the condenser 402, and sends it out as low-temperature, low-pressure liquid refrigerant.
  • the evaporator 404 exchanges heat between the low-temperature, low-pressure liquid refrigerant sent from the pressure reducing device 403 and the indoor air, evaporating the refrigerant and sending it out as refrigerant gas.
  • the air from which the heat has been removed by the evaporator 404 is supplied by the indoor blower 406 to the room, which is the space to be air-conditioned.
  • the electric motor 100 described in each embodiment and modification can be applied to the compressor 401 of the refrigeration cycle device 400.
  • the electric motor 100 has high motor efficiency due to the improved magnetization rate of the permanent magnet 40. Therefore, the operating efficiency of the refrigeration cycle device 400 can be improved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Compressor (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

Ce moteur électrique comprend : un rotor qui comporte un arbre et un aimant permanent ; et un stator qui entoure le rotor et est fixé au côté interne d'une enveloppe cylindrique. Le stator comporte un noyau de stator, et un enroulement enroulé autour du noyau de stator. Un espace est formé entre le noyau de stator et l'enveloppe et/ou à l'intérieur du noyau de stator. Ce procédé de magnétisation comprend : une étape consistant à insérer un corps magnétique dans l'espace ; une étape consistant à amener un courant de magnétisation à s'écouler à travers l'enroulement ; et une étape consistant à retirer le corps magnétique hors de l'espace.
PCT/JP2023/000729 2023-01-13 2023-01-13 Procédé de magnétisation, moteur électrique, compresseur et appareil à cycle de réfrigération Ceased WO2024150393A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2023/000729 WO2024150393A1 (fr) 2023-01-13 2023-01-13 Procédé de magnétisation, moteur électrique, compresseur et appareil à cycle de réfrigération

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2023/000729 WO2024150393A1 (fr) 2023-01-13 2023-01-13 Procédé de magnétisation, moteur électrique, compresseur et appareil à cycle de réfrigération

Publications (1)

Publication Number Publication Date
WO2024150393A1 true WO2024150393A1 (fr) 2024-07-18

Family

ID=91896642

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/000729 Ceased WO2024150393A1 (fr) 2023-01-13 2023-01-13 Procédé de magnétisation, moteur électrique, compresseur et appareil à cycle de réfrigération

Country Status (1)

Country Link
WO (1) WO2024150393A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000324770A (ja) * 1999-05-12 2000-11-24 Mitsubishi Electric Corp 永久磁石型電動機とその着磁方法
JP2008072890A (ja) * 2006-09-11 2008-03-27 Samsung Kwangju Electronics Co Ltd 圧縮機モーターのマグネット着磁方法
JP2013126281A (ja) * 2011-12-14 2013-06-24 Daikin Ind Ltd 界磁子の製造方法及び界磁子用の端板
WO2019198138A1 (fr) * 2018-04-10 2019-10-17 三菱電機株式会社 Moteur électrique, compresseur, et dispositif de climatisation
WO2020245903A1 (fr) * 2019-06-04 2020-12-10 三菱電機株式会社 Anneau de magnétisation, procédé de magnétisation, dispositif de magnétisation, rotor, moteur électrique, compresseur et dispositif de climatisation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000324770A (ja) * 1999-05-12 2000-11-24 Mitsubishi Electric Corp 永久磁石型電動機とその着磁方法
JP2008072890A (ja) * 2006-09-11 2008-03-27 Samsung Kwangju Electronics Co Ltd 圧縮機モーターのマグネット着磁方法
JP2013126281A (ja) * 2011-12-14 2013-06-24 Daikin Ind Ltd 界磁子の製造方法及び界磁子用の端板
WO2019198138A1 (fr) * 2018-04-10 2019-10-17 三菱電機株式会社 Moteur électrique, compresseur, et dispositif de climatisation
WO2020245903A1 (fr) * 2019-06-04 2020-12-10 三菱電機株式会社 Anneau de magnétisation, procédé de magnétisation, dispositif de magnétisation, rotor, moteur électrique, compresseur et dispositif de climatisation

Similar Documents

Publication Publication Date Title
JP6667591B2 (ja) 永久磁石埋込型電動機、圧縮機、および冷凍空調装置
JP6636144B2 (ja) 固定子、電動機、圧縮機、および冷凍空調装置
JP6053910B2 (ja) 永久磁石埋込型電動機、圧縮機、および冷凍空調装置
US20200099263A1 (en) Stator, electric motor, compressor, refrigerating and air conditioning apparatus, and method for manufacturing stator
EP3605796B1 (fr) Rotor, moteur électrique, compresseur, ventilateur et dispositif de climatisation
CN109565191B (zh) 电动机、压缩机及制冷空调装置
CN111903038B (zh) 电动机、压缩机及空气调节装置
JP7105999B2 (ja) 電動機、圧縮機、空気調和装置および電動機の製造方法
WO2019215865A1 (fr) Rotor, moteur, compresseur, et dispositif de climatiseur
US20240120787A1 (en) Motor, compressor, and refrigeration cycle apparatus
JP7130131B2 (ja) 着磁用リング、着磁方法、着磁装置、ロータ、電動機、圧縮機および空気調和装置
WO2024150393A1 (fr) Procédé de magnétisation, moteur électrique, compresseur et appareil à cycle de réfrigération
JP7374352B2 (ja) 着磁装置、着磁方法、ロータ、電動機、圧縮機および冷凍サイクル装置
JP7258140B2 (ja) 回転子、電動機、圧縮機、及び空気調和機
JP7486911B2 (ja) 電動機、圧縮機、冷凍サイクル装置、着磁方法および着磁装置
US20210152039A1 (en) Stator, motor, compressor, and refrigerating and air conditioning apparatus
JP7612041B2 (ja) 電動機、圧縮機および冷凍サイクル装置
JP7286019B2 (ja) 固定子、電動機、圧縮機、冷凍サイクル装置及び空気調和装置
WO2023119455A1 (fr) Procédé de magnétisation, moteur électrique, compresseur et dispositif à cycle de réfrigération
WO2024166161A1 (fr) Rotor, moteur électrique, compresseur, et dispositif à cycle de réfrigération
WO2025158644A1 (fr) Moteur électrique, compresseur et dispositif à cycle de réfrigération
WO2023148844A1 (fr) Moteur électrique, compresseur et dispositif à cycle de réfrigération
JP2025128603A (ja) ロータ、モータ、圧縮機、および、冷凍装置
WO2022054226A1 (fr) Stator, moteur, compresseur et dispositif de climatisation

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23916014

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE