WO2020003414A1 - 電動機、送風機および空気調和装置 - Google Patents
電動機、送風機および空気調和装置 Download PDFInfo
- Publication number
- WO2020003414A1 WO2020003414A1 PCT/JP2018/024407 JP2018024407W WO2020003414A1 WO 2020003414 A1 WO2020003414 A1 WO 2020003414A1 JP 2018024407 W JP2018024407 W JP 2018024407W WO 2020003414 A1 WO2020003414 A1 WO 2020003414A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotor
- permanent magnet
- stator
- electric motor
- magnet
- Prior art date
Links
- 238000004378 air conditioning Methods 0.000 title description 2
- 238000003780 insertion Methods 0.000 claims abstract description 53
- 230000037431 insertion Effects 0.000 claims abstract description 53
- 230000002093 peripheral effect Effects 0.000 claims description 35
- 239000003795 chemical substances by application Substances 0.000 claims description 34
- 239000003507 refrigerant Substances 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 7
- 238000004804 winding Methods 0.000 abstract description 3
- 230000004907 flux Effects 0.000 description 50
- 230000005347 demagnetization Effects 0.000 description 48
- 229920005989 resin Polymers 0.000 description 33
- 239000011347 resin Substances 0.000 description 33
- 230000004888 barrier function Effects 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 14
- 238000001514 detection method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000012212 insulator Substances 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000005415 magnetization Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 4
- 229920001707 polybutylene terephthalate Polymers 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 238000009499 grossing Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- -1 polybutylene terephthalate Polymers 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 239000004412 Bulk moulding compound Substances 0.000 description 2
- 229920000106 Liquid crystal polymer Polymers 0.000 description 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2746—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets arranged with the same polarity, e.g. consequent pole type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/27—Devices for sensing current, or actuated thereby
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
Definitions
- the present invention relates to an electric motor, a blower, and an air conditioner.
- the thickness of the permanent magnet increases, demagnetization is less likely to occur. However, since the amount of the permanent magnet material used increases, the manufacturing cost increases. On the other hand, if the thickness of the permanent magnet is made too thin, the amount of the permanent magnet material used decreases, but the cost per unit weight of the permanent magnet increases due to the increase in processing cost, and as a result, the manufacturing cost increases. .
- the present invention has been made to solve the above-described problems, and has as its object to suppress the demagnetization of a permanent magnet while reducing the manufacturing cost.
- An electric motor is a rotor having a rotor core having a magnet insertion hole, a permanent magnet disposed in the magnet insertion hole, rotatable about a rotation axis, and a stator provided to surround the rotor. And a stator having a stator core having teeth facing the rotor and a coil wound around the teeth.
- the permanent magnet has a thickness of 2.1 mm or more in a direction facing the stator, and is magnetized in the thickness direction.
- the electric motor of the present invention also has a rotor core having a magnet insertion hole, a permanent magnet disposed in the magnet insertion hole, a rotor rotatable around a rotation axis, and a stator provided to surround the rotor. And a stator having a stator core having teeth facing the rotor, and a stator having coils wound around the teeth.
- the permanent magnet has a thickness of 3 mm or more in a direction facing the stator, and is magnetized in the thickness direction. The thickness of the permanent magnet is 3 mm or more.
- the demagnetization of the permanent magnet can be suppressed while the manufacturing cost is reduced by suppressing the price per unit weight of the permanent magnet.
- 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 rotor according to the first embodiment.
- FIG. 2 is an enlarged cross-sectional view showing a part of the electric motor according to the first embodiment.
- FIG. 4 is an enlarged schematic diagram showing a portion including a gap between the rotors of the first embodiment.
- FIG. 2 is an enlarged cross-sectional view illustrating a part of the rotor according to the first embodiment;
- 4 is a graph showing a relationship between a thickness of a permanent magnet and a price per unit weight.
- 4 is a graph showing a relationship between Ip ⁇ Nt / AG and a lower limit of a coercive force of a permanent magnet.
- FIG. 4 is a graph showing a relationship between Ip ⁇ Nt / AG and a lower limit of a coercive force of a permanent magnet. It is a schematic diagram for explaining the flow of the magnetized magnetic flux in the rotor.
- FIG. 3 is a block diagram illustrating a control system of the electric motor according to the first embodiment.
- FIG. 13 is a cross-sectional view illustrating a rotor according to a second embodiment.
- FIG. 13 is a cross-sectional view illustrating a part of a rotor according to a second embodiment.
- FIG. 13 is a schematic diagram for explaining an end face position of a permanent magnet of the rotor according to the second embodiment.
- FIG. 10 is a vertical sectional view showing the electric motor according to the second embodiment.
- FIG. 9 is a graph illustrating a relationship between a demagnetizing current and a demagnetization rate in the electric motor according to the second embodiment. It is a front view (A) showing the air conditioner to which the electric motor of each embodiment is applied, and a sectional view (B) showing the outdoor unit.
- FIG. 17 is a schematic diagram illustrating a refrigerant circuit of the air-conditioning apparatus illustrated in FIG.
- FIG. 1 is a sectional view showing the electric motor 1 according to the first embodiment.
- the electric motor 1 is an inner rotor type electric motor including a rotatable rotor 2 and an annular stator 5 provided so as to surround the rotor 2.
- the electric motor 1 is also a permanent magnet embedded motor in which the permanent magnet 25 is embedded in the rotor 2.
- An air gap (gap) 10 of, for example, 0.4 mm is provided between the rotor 2 and the stator 5.
- FIG. 1 is a cross-sectional view of a plane orthogonal to the rotation axis C1 of the rotor 2.
- the stator 5 has a stator core 50 and a coil 55 wound around the stator core 50.
- the stator core 50 is formed by laminating a plurality of magnetic laminated elements having a thickness of, for example, 0.2 mm to 0.5 mm in the axial direction and fixing them by caulking or the like.
- the laminated element is an electromagnetic steel sheet mainly containing iron (Fe).
- the stator core 50 has an annular yoke 52 centered on the rotation axis C1, and a plurality of teeth 51 extending radially inward from the yoke 52 (that is, toward the rotation axis C1).
- the teeth 51 are arranged at equal intervals in the circumferential direction.
- the number of the teeth 51 is 12, here, but is not limited to 12.
- a slot 53 that is a space for accommodating the coil 55 is formed between the adjacent teeth 51.
- a radially inner end portion of the tooth 51 is wider in a circumferential direction than other portions of the tooth 51.
- the tips of the teeth 51 face the outer periphery of the rotor 2 via the air gap 10 described above.
- the outer periphery 50a of the stator core 50 that is, the outer periphery of the yoke 52
- the inner periphery 50b that is, the tip of the teeth 51
- the caulking portions for integrally fixing the respective laminated elements of the stator core 50 are formed on the yoke 52 and the teeth 51 of the stator core 50 as indicated by reference numerals 56 and 57.
- the caulking portion may be formed at another position as long as the laminated element can be integrally fixed.
- An insulator 54 as an insulating part is attached to the stator core 50.
- the insulator 54 is interposed between the stator core 50 and the coil 55, and insulates the stator core 50 from the coil 55.
- the insulator 54 is formed by molding a resin integrally with the stator core 50 or by assembling a resin molded body molded as a separate component to the stator core 50.
- the insulator 54 is made of, for example, an insulating resin such as polybutylene terephthalate (PBT), polyphenylene sulfide (PBS), liquid crystal polymer (LCP), or polyethylene terephthalate (PET).
- PBT polybutylene terephthalate
- PBS polyphenylene sulfide
- LCP liquid crystal polymer
- PET polyethylene terephthalate
- the insulator 54 can also be formed of an insulating resin film having a thickness of 0.035 to 0.4 mm.
- the coil 55 is wound around the teeth 51 via the insulator 54.
- the coil 55 is made of a material mainly containing copper or aluminum.
- the coil 55 is wound around each tooth 51 (concentrated winding).
- the slot 53 may be filled with a resin (for example, the same resin as the insulator 54) so as to surround the coil 55.
- FIG. 2 is a sectional view showing the rotor 2.
- the rotor 2 has a cylindrical rotor core 20 centered on the rotation axis C1.
- the rotor core 20 is formed by laminating a plurality of laminated elements having a thickness of 0.2 to 0.5 mm and having magnetism in the axial direction, and fixing them by caulking or the like.
- the laminated element is an electromagnetic steel sheet mainly containing iron.
- the rotor core 20 may be formed of a resin core obtained by combining a soft magnetic material and a resin.
- the diameter of the rotor 2 is 50 mm here.
- the rotor core 20 has a center hole 23 at the center in the radial direction.
- the center hole 23 is a shaft insertion hole that penetrates the rotor core 20 in the axial direction and has a circular cross section.
- the rotating shaft 11 is fixed inside the center hole 23, and is rotatably supported by bearings 12, 13 (FIG. 14).
- the rotation axis C ⁇ b> 1 is a central axis of the rotation shaft 11.
- the rotating shaft 11 is made of, for example, a metal such as iron (Fe), nickel (Ni), or chromium (Cr).
- a plurality of magnet insertion holes 21 are formed along the outer peripheral surface of the rotor core 20.
- the magnet insertion holes 21 are arranged at equal intervals in the circumferential direction.
- Each magnet insertion hole 21 has a shape that is long in the circumferential direction, and penetrates the rotor core 20 in the axial direction.
- the number of the magnet insertion holes 21 is ten here, but is not limited to ten.
- the magnet insertion hole 21 extends linearly in a direction orthogonal to a straight line (also referred to as a magnetic pole center line) passing through a pole center M1 and a rotation axis C1 described later.
- the magnet insertion hole 21 has an outer end 21a that is a radially outer end, an inner end 21b that is a radially inner end, and a side end 21c that is both ends in the circumferential direction.
- a permanent magnet 25 is disposed in each magnet insertion hole 21.
- the permanent magnet 25 is a plate-shaped member and has a thickness T1 in a direction facing the stator 5 (more specifically, in a radial direction of the rotor core 20).
- the permanent magnet 25 is made of, for example, a rare earth magnet mainly containing neodymium (Nd) or Sm (samarium). It should be noted that a ferrite magnet containing iron as a main component may be used instead of the rare earth magnet.
- the permanent magnet 25 is magnetized in the thickness direction (in other words, has anisotropy).
- the permanent magnets 25 adjacent to each other in the circumferential direction are arranged with the magnetic poles opposite to each other facing the outer peripheral side of the rotor core 20.
- a magnetic pole is formed by the permanent magnet 25 arranged in the magnet insertion hole 21. Therefore, the number of magnetic poles of the rotor 2 is ten. However, the number of magnetic poles of the rotor 2 is not limited to ten.
- the circumferential center of the magnet insertion hole 21 is the pole center M1.
- the space between adjacent magnet insertion holes 21 is a gap M2.
- the permanent magnet 25 has an outer end 25a that is a radially outer end, an inner end 25b that is a radially inner end, and a side end 25c that is both ends in the circumferential direction.
- the outer end 25a of the permanent magnet 25 faces the outer end 21a of the magnet insertion hole 21, and the inner end 25b of the permanent magnet 25 faces the inner end 21b of the magnet insertion hole 21.
- the side end 25c of the permanent magnet 25 faces the side end 21c of the magnet insertion hole 21.
- one permanent magnet 25 is arranged in one magnet insertion hole 21, but a plurality of permanent magnets 25 may be arranged in one magnet insertion hole 21 in the circumferential direction.
- the magnet insertion hole 21 may be formed in a V-shape such that the center in the circumferential direction projects radially inward.
- Flux barriers 22 are formed on both circumferential sides of the magnet insertion hole 21.
- Each flux barrier 22 extends from the outer end 21a of the magnet insertion hole 21 radially outward to a first portion 22a (FIG. 4), and extends from the side end 21c of the magnet insertion hole 21 to the gap M2. And a second portion 22b (FIG. 4).
- a core portion between the flux barrier 22 and the outer periphery of the rotor core 20 is a thin portion (also referred to as a bridge portion). It is desirable that the thickness of the thin portion is the same as the thickness of the laminated element forming the rotor core 20. Thereby, the leakage magnetic flux between the adjacent magnetic poles can be suppressed.
- the flux barriers 22 are arranged on both sides in the circumferential direction of the magnet insertion holes 21, but may be arranged only on one side in the circumferential direction of the magnet insertion holes 21.
- FIG. 3 is a cross-sectional view showing a part of the electric motor 1 in an enlarged manner.
- the rotor core 20 has a flower circle shape in which the outer diameter becomes maximum at the pole center M1 and becomes minimum at the pole gap M2.
- the inner circumference 50b of the stator core 50 is annular. Therefore, the distance between the rotor 2 and the stator 5 (that is, the width of the air gap 10) has a minimum value G1 at the pole center M1 and a maximum value G2 at the pole gap M2.
- This minimum value G1 of the distance between the rotor 2 and the stator 5 is referred to as the minimum distance AG between the rotor 2 and the stator 5.
- FIG. 4 is an enlarged view showing a portion including the gap M2 of the rotor 2.
- the outer circumference of the rotor core 20 has an outer circumference 20a including the pole center M1 and an outer circumference 20b including the gap M2.
- the outer peripheral portions 20a and 20b are both arc-shaped portions having a center of curvature on the rotation axis C1 side, but have different radii of curvature.
- the boundary E between the outer peripheral portion 20a and the outer peripheral portion 20b is located radially outside the flux barrier 22 here.
- FIG. 5 is a cross-sectional view showing a part of the rotor 2 in an enlarged manner.
- the outer periphery 20b including the pole gap M2 is farther from the inner periphery 50b (FIG. 3) of the stator 5 than the outer periphery 20a including the pole center M1. That is, the outer peripheral portion 20b faces the wider air gap 10 than the outer peripheral portion 20a.
- a point A1 is taken as a first point on the outer peripheral portion 20b.
- the side end 25c (that is, the end in the circumferential direction) of the permanent magnet 25 is disposed on a straight line L1 connecting the point A1 and the rotation axis C1. Since the outer peripheral portion 20b of the rotor core 20 is far from the stator 5, the side end 25c of the permanent magnet 25 is arranged on the straight line L1, so that the magnetic flux (also referred to as the stator magnetic flux) from the stator 5 becomes permanent. It becomes difficult to flow to the side end 25c of the magnet 25.
- the side end portion 25c of the permanent magnet 25 is a portion where demagnetization easily occurs. However, by arranging the side end portion 25c of the permanent magnet 25 in this manner, demagnetization hardly occurs.
- an outer corner 25e which is a radially outer corner of the side end 25c of the permanent magnet 25, is arranged on a straight line L1 connecting the point A1 and the rotation axis C1.
- the outer corner 25e of the permanent magnet 25 is the portion where demagnetization is most likely to occur, but by arranging the outer corner 25e of the permanent magnet 25 in this manner, demagnetization is less likely to occur.
- the outer corner 25e of the permanent magnet 25 is disposed inside the flux barrier 22, as shown in FIG. 4, and does not contact the rotor core 20. Therefore, the magnetic flux flowing in the rotor core 20 does not easily reach the outer corners 25e of the permanent magnet 25, and as a result, the demagnetization of the outer corners 25e of the permanent magnet 25 further hardly occurs.
- the demagnetization characteristic of the permanent magnet 25 has a phase with the thickness T1 of the permanent magnet 25. In general, as the thickness T1 of the permanent magnet 25 is larger, the demagnetization is less likely to occur (in other words, the demagnetization proof strength is increased), and as the thickness T1 is smaller, the demagnetization is more likely to occur (in other words, the demagnetization proof strength is smaller). ).
- the thickness T1 of the permanent magnet 25 is larger, the amount of material used is increased, so that the manufacturing cost is increased.
- the thickness T1 of the permanent magnet 25 is too small, the amount of material used will decrease, but the processing cost will exceed this and the manufacturing cost will increase.
- FIG. 6 is a graph showing the relationship between the thickness T1 (mm) of the permanent magnet 25 and the price per unit weight of the permanent magnet 25 (yen / g).
- FIG. 6 shows that when the thickness T1 of the permanent magnet 25 is smaller than 2.1 mm, the price per unit weight (yen / g) of the permanent magnet 25 sharply increases due to an increase in processing cost. Therefore, it is desirable to suppress the demagnetization of the permanent magnet 25 while keeping the thickness T1 of the permanent magnet 25 at 2.1 mm or more.
- the magnetic flux reaching the rotor 2 from the stator 5 increases, and as the minimum distance AG between the rotor 2 and the stator 5 is larger, the magnetic flux reaches the rotor 2 from the stator 5. The generated magnetic flux decreases.
- the product Ip ⁇ Nt of the overcurrent threshold value Ip (A), which is the maximum value of the current flowing through the coil 55, and the number of turns Nt of the coil 55 for one tooth 51 is calculated as the product of the rotor 2 and the stator 5. Attention is paid to the value (Ip ⁇ Nt / AG) divided by the minimum interval AG (mm). The unit of Ip ⁇ Nt / AG is A / mm.
- the electric motor 1 is controlled by a driving device 101 (FIG. 10) described later so that the current flowing through the coil 55 does not exceed the overcurrent threshold (that is, the overcurrent protection level). This is the current threshold value Ip.
- the overcurrent threshold is also called an overcurrent cutoff value.
- FIG. 7 is a graph showing the relationship between Ip ⁇ Nt / AG and the lower limit Hct (kA / m) of the coercive force of the permanent magnet 25.
- the coercive force refers to the strength of the magnetic field at which the magnetic polarization of the permanent magnet 25 becomes zero in the magnetization curve (JH curve).
- the permanent magnet 25 composed of a rare earth magnet has a property that the coercive force decreases with an increase in temperature.
- the electric motor 1 is used as a blower of an air conditioner, the temperature of the permanent magnet 25 rises to 100 ° C. Therefore, the coercive force when the temperature of the permanent magnet 25 reaches 100 ° C. (that is, the highest temperature in the operating temperature range) is defined as the lower limit value Hct of the coercive force.
- FIG. 7 shows data when the thickness T1 of the permanent magnet 25 is changed in five ways: 1.5 mm, 2.1 mm, 3 mm, 5 mm, and 6 mm.
- the thickness T1 of the permanent magnet 25 is 2.1 mm
- the permanent No demagnetization of the magnet 25 occurs. Since the demagnetization is less likely to occur as the thickness T1 of the permanent magnet 25 is larger, the curve is positioned lower as the thickness T1 is larger.
- the thickness T1 of the permanent magnet 25 becomes 3 mm or more
- the price (yen / g) per unit weight of the permanent magnet 25 becomes constant. Therefore, it is more desirable to suppress the demagnetization of the permanent magnet 25 while keeping the thickness T1 of the permanent magnet 25 at 3 mm or more.
- the side end 25c of the permanent magnet 25 is disposed on a straight line L1 connecting the point A1 on the outer peripheral portion 20b of the rotor core 20 and the rotation axis C1.
- the air gap 10 between the rotor 2 and the stator 5 is an air gap
- the air gap 10 has a larger magnetic resistance than the rotor core 20 made of a magnetic material. Therefore, by disposing the side end portion 25c of the permanent magnet 25 radially inside (ie, on the straight line L1) of the outer peripheral portion 20b having a wide gap between the stator 5 and the stator 5, it becomes difficult for the stator magnetic flux to flow into the side end portion 25c. In addition, demagnetization of the side end 25c of the permanent magnet 25 can be suppressed.
- the portion of the permanent magnet 25 where demagnetization is most likely to occur is the outer corner 25e of the side end 25c. Therefore, as shown in FIG. 4, it is desirable that the outer corner 25e of the permanent magnet 25 be disposed on a straight line L1 connecting the point A1 on the outer peripheral portion 20b of the rotor core 20 and the rotation axis C1. This makes it difficult for the stator magnetic flux to flow to the outer corners 25e, thereby making it harder for the outer corners 25e of the permanent magnet 25 to be demagnetized.
- the outer corner 25e of the permanent magnet 25 is disposed inside the flux barrier 22, and does not contact the rotor core 20.
- the flux barrier 22 is an air gap and has a high magnetic resistance. Since the outer corner 25e of the permanent magnet 25 is surrounded by the air gap, the magnetic flux flowing in the rotor core 20 hardly reaches the outer corner 25e. As a result, demagnetization of the outer corner portion 25e of the permanent magnet 25 can be further reduced.
- the thickness T1 of the permanent magnet 25 is desirably 2.1 mm or more in order to reduce manufacturing costs.
- the permanent magnet 25 is generally magnetized while being inserted into the magnet insertion hole 21 of the rotor core 20.
- FIG. 9 is a schematic view showing a step of magnetizing the permanent magnet 25.
- the magnetized magnetic flux F generated by the magnetizing device arranged on the outer peripheral side of the rotor core 20 flows through the outer peripheral side of the rotor core 20 to the permanent magnet 25 in the magnet insertion hole 21.
- the magnetization direction D of the permanent magnet 25 is the thickness direction. Therefore, of the magnetized magnetic flux F, only the component in the thickness direction of the permanent magnet 25 contributes to the magnetization of the permanent magnet 25. If the thickness of the permanent magnet 25 exceeds 4 mm (thickness T2 shown in FIG. 9) when the diameter of the rotor 2 is 50 mm, the magnetizing magnetic flux F passing through the radially inner region of the permanent magnet 25 becomes larger in the thickness direction. As a result, the magnetization inside the permanent magnet 25 in the radial direction becomes insufficient.
- the thickness T1 of the permanent magnet 25 is desirably 4 mm or less.
- FIG. 10 is a block diagram illustrating a configuration of the driving device 101.
- the driving device 101 may be mounted on the substrate 7 (FIG. 14) incorporated in the electric motor 1 or may be provided outside the electric motor 1.
- the drive device 101 includes a converter 102 for rectifying the output of the power supply 110, an inverter 103 for outputting an AC voltage to the coil 55 of the electric motor 1, and a control device 105 for controlling these.
- the power supply 110 is, for example, an AC power supply of 200 V (effective voltage).
- the control device 105 includes a current detection circuit 108 for detecting a current value of the inverter 103, an inverter drive circuit 107 for driving the inverter 103, and a CPU 106 as an inverter control unit.
- the converter 102 is a rectifier circuit that receives an AC voltage from the power supply 110, performs rectification and smoothing, and outputs the rectified and smoothed data from the buses 111 and 112.
- the converter 102 includes bridge diodes 102a, 102b, 102c, 102d for rectifying an AC voltage, and a smoothing capacitor 102e for smoothing an output voltage.
- the voltage output from converter 102 is referred to as a bus voltage.
- the output voltage of converter 102 is controlled by control device 105.
- the input terminal of the inverter 103 is connected to the buses 111 and 112 of the converter 102.
- the output terminals of the inverter 103 are connected to three-phase coil portions of the motor 1 via U-phase, V-phase, and W-phase wirings (output lines) 104U, 104V, and 104W, respectively.
- Inverter 103 includes a U-phase switching element 1Ua corresponding to a U-phase upper arm, a U-phase switching element 1Ub corresponding to a U-phase lower arm, a V-phase switching element 1Va corresponding to a V-phase upper arm, and a V-phase lower arm. , A W-phase switching element 1Wa corresponding to a W-phase upper arm, and a W-phase switching element 1Wb corresponding to a W-phase lower arm.
- U-phase switching elements 1Ua and 1Ub are connected to U-phase wiring 104U.
- U-phase diode 2Ua is connected in parallel to U-phase switching element 1Ua
- U-phase diode 2Ub is connected in parallel to U-phase switching element 1Ub.
- V-phase switching elements 1Va and 1Vb are connected to V-phase wiring 104V.
- V-phase switching element 1Va is connected in parallel with V-phase diode 2Va
- V-phase switching element 1Vb is connected in parallel with V-phase diode 2Vb.
- the W-phase switching elements 1Wa and 1Wb are connected to the W-phase wiring 104W.
- the W-phase switching element 1Wa is connected in parallel with a W-phase diode 2Wa
- the W-phase switching element 1Wb is connected in parallel with a W-phase diode 2Wb.
- Each of the switching elements 1Ua to 1Wb can be configured by a transistor such as an IGBT (insulated gate transistor). ON / OFF of each of the switching elements 1Ua to 1Wb is controlled by a drive signal from the inverter drive circuit 107.
- a transistor such as an IGBT (insulated gate transistor).
- the inverter drive circuit 107 generates a drive signal for turning on and off each of the switching elements 1Ua to 1Wb of the inverter 103 based on a PWM (Pulse Width Modulation) signal input from the CPU 106, and outputs the drive signal to the inverter 103.
- PWM Pulse Width Modulation
- a resistor 109 is connected to the input side of the inverter 103 (for example, the bus 112 from the converter 102), and a current detection circuit 108 is connected to the resistor 109.
- the current detection circuit 108 is a current detection unit that detects the current value of the current on the input side of the inverter 103 (that is, the bus current of the converter 102), and uses a shunt resistor here.
- the CPU 106 as an inverter control unit controls the inverter 103.
- CPU 106 outputs an inverter drive signal (PWM signal) to inverter 103 based on an operation instruction signal from a remote controller or the like of air conditioner 500.
- PWM signal an inverter drive signal
- the CPU 106 detects the current value of the inverter 103 by the current detection circuit 108, and compares the detected current value with an overcurrent threshold stored in advance. If the detected current value is equal to or greater than the overcurrent threshold, a stop signal is output to the inverter 103 to stop the inverter 103 (that is, stop the rotation of the electric motor 1).
- This overcurrent threshold is the above-described overcurrent threshold Ip.
- the permanent magnet 25 has a thickness T1 of 2.1 mm or more, the minimum distance AG between the rotor 2 and the stator 5, and the winding of the coil 55 wound around the teeth 51.
- the number Nt, the overcurrent threshold value Ip of the current flowing through the coil 55, and the lower limit value Hct of the coercive force of the permanent magnet 25 satisfy Hct ⁇ 0.4 ⁇ (Ip ⁇ Nt / AG) +410.
- the demagnetization of the permanent magnet 25 can be suppressed while the manufacturing cost is reduced by reducing the price per unit weight of the magnet 25.
- the permanent magnet 25 has a thickness T1 of 3 mm or more, the minimum distance AG between the rotor 2 and the stator 5, the number of turns Nt of the coil 55 wound around the teeth 51, and the overcurrent threshold value of the current flowing through the coil 55.
- the entire permanent magnet 25 can be sufficiently magnetized while the permanent magnet 25 is inserted into the magnet insertion hole 21.
- the outer periphery of the rotor core 20 has an outer peripheral portion 20a (ie, a first outer peripheral portion) having a short distance to the stator 5, and an outer peripheral portion 20b (ie, a second outer peripheral portion) having a long distance to the stator 5.
- the side end 25c of the permanent magnet 25 is disposed on a straight line connecting the point A1 (that is, the first point) on the outer peripheral portion 20b and the rotation axis C1. Therefore, it is difficult for the stator magnetic flux to flow to the side end portion 25c of the permanent magnet 25, and demagnetization can be suppressed.
- the outer corner portion 25 e of the permanent magnet 25 is formed in the flux barrier 22 formed continuously with the magnet insertion hole 21 and is not in contact with the rotor core 20, the magnetic flux in the rotor core 20 is outside the permanent magnet 25. It is difficult to reach the corner 25e, and the effect of suppressing demagnetization can be further enhanced.
- Embodiment 2 FIG. Next, a second embodiment of the present invention will be described.
- the electric motor 1A according to the second embodiment is different from the electric motor 1 according to the first embodiment in the configuration of the rotor 3.
- the stator of electric motor 1A according to the second embodiment has the same configuration as stator 5 of electric motor 1 according to the first embodiment.
- FIG. 11 is a cross-sectional view illustrating the rotor 3 according to the second embodiment.
- the rotor 3 has a cylindrical rotor core 30 centered on the rotation axis C1.
- the rotor core 30 is formed by laminating a plurality of laminated elements having a thickness of 0.2 to 0.5 mm and having magnetism in the axial direction, and fixing them by caulking or the like.
- the configuration of the laminated element is as described in the first embodiment.
- a plurality of magnet insertion holes 31 are formed along the outer peripheral surface of the rotor core 30.
- the magnet insertion holes 31 are arranged at equal intervals in the circumferential direction.
- Each magnet insertion hole 31 has a shape that is long in the circumferential direction, and penetrates through the rotor core 30 in the axial direction.
- the number of the magnet insertion holes 31 is five.
- a permanent magnet 35 is arranged in each magnet insertion hole 31.
- the magnet pole P1 is formed by the permanent magnets 35 arranged in the respective magnet insertion holes 31.
- the permanent magnets 35 are arranged with the same magnetic pole (for example, N pole) facing the outer peripheral side of the rotor core 30. Therefore, a portion in which magnetic flux flows in the radial direction occurs between the adjacent permanent magnets 35 in the rotor core 30. That is, a pseudo magnetic pole P2 having a polarity opposite to that of the permanent magnet 35 is formed.
- the rotor 3 has five magnet magnetic poles P1 and five pseudo magnetic poles P2 alternately in the circumferential direction. Therefore, the number of poles of the rotor 3 is ten.
- An electric motor having such a rotor structure is called a consequent pole type.
- the number of poles of the rotor 3 is not limited to 10 poles.
- the inner periphery 33 of the rotor core 30 is annular, and a resin portion 4 as a support portion for supporting the rotor core 30 is provided inside the inner periphery 33.
- the resin portion 4 supports the rotor core 30 with respect to the rotating shaft 11, and is made of a nonmagnetic material, more specifically, a thermoplastic resin such as PBT (polybutylene terephthalate).
- the resin part 4 is obtained by molding the rotor core 30 and the rotating shaft 11 with resin.
- the resin portion 4 includes an inner cylindrical portion 41 fixed to the outer peripheral surface of the rotating shaft 11, an annular outer cylindrical portion 43 fixed to the inner periphery 33 of the rotor core 30, an inner cylindrical portion 41, and an outer cylindrical portion 43. And a plurality of ribs (connecting portions) 42 to be connected.
- the rotating shaft 11 penetrates through the inner cylindrical portion 41 of the resin portion 4.
- the ribs 42 are arranged at equal intervals in the circumferential direction, and extend radially outward from the inner cylindrical portion 41.
- the circumferential position of the rib 42 corresponds to the circumferential center of the permanent magnet 35 (that is, the pole center of the magnet magnetic pole P1).
- Cavities 44 are formed in the ribs 42 adjacent in the circumferential direction.
- the outer cylindrical portion 43 is formed continuously with a radially outer end of the rib 42.
- FIG. 12 is a cross-sectional view showing the rotor core 30 and the permanent magnet 35.
- the outer periphery of the rotor core 30 has an outer peripheral portion 30a (i.e., a first outer peripheral portion) centered on the pole center of each magnetic pole (the magnet magnetic pole P1 and the pseudo magnetic pole P2) and an outer peripheral portion 30b (i.e., the second outer periphery portion 30b) having a center between the poles. Outer periphery).
- the shapes of the outer peripheral portions 30a and 30b are the same as the outer peripheral portions 20a and 20b described in the first embodiment.
- the shape of the magnet insertion hole 31 is the same as that of the magnet insertion hole 21 of the first embodiment.
- Flux barriers 32 are formed on both circumferential sides of the magnet insertion hole 31.
- the flux barrier 32 suppresses leakage magnetic flux between the magnetic pole P1 and the pseudo magnetic pole P2.
- the shape of the flux barrier 32 is the same as that of the flux barrier 22 of the first embodiment.
- the configuration of the permanent magnet 35 is the same as that of the permanent magnet 25 of the first embodiment. That is, the thickness of the permanent magnet 35 is 2.1 mm or more.
- the overcurrent threshold value Ip (A) of the current flowing through the coil 55, the number of turns Nt of the coil 55 for one tooth 51, the minimum distance AG (mm) between the rotor 2 and the stator 5, and the maintenance of the permanent magnet 35 The lower limit value Hct of the magnetic force satisfies Hct ⁇ 0.4 ⁇ (Ip ⁇ Nt / AG) +410.
- the thickness of the permanent magnet 35 may be 3 mm or more.
- the overcurrent threshold value Ip (A) of the current flowing through the coil 55, the number of turns Nt of the coil 55 for one tooth 51, the minimum distance AG (mm) between the rotor 2 and the stator 5, and the The lower limit of the coercive force Hct satisfies Hct ⁇ 0.32 ⁇ (Ip ⁇ Nt / AG) +350.
- the thickness T1 of the permanent magnet 35 is set to 2.1 mm or more (or 3 mm or more), it is possible to suppress the demagnetization of the permanent magnet 25 while reducing the manufacturing cost.
- FIG. 13 is an enlarged view for explaining the position of the side end 35c of the permanent magnet 35.
- a straight line connecting the point A1 on the outer peripheral portion 30b of the rotor core 30 and the rotation axis C1 (FIG. 12) is defined as a straight line L1.
- the side end 35c of the permanent magnet 35 is located on the straight line L1. This makes it difficult for the stator magnetic flux to flow to the side end 35c of the permanent magnet 35, which is a portion where demagnetization is likely to occur, and suppresses demagnetization.
- the outer corner 35e which is the radially outer end of the side end 35c of the permanent magnet 35, is located on the straight line L1. This makes it difficult for the stator magnetic flux to flow to the outer corner 35e of the permanent magnet 35, which is the part where demagnetization is most likely to occur, and the effect of suppressing demagnetization increases.
- the outer corner 35e of the permanent magnet 35 is located inside the flux barrier 32 and does not contact the rotor core 30. This makes it difficult for the magnetic flux flowing through the rotor core 30 to reach the outer corners 35e of the permanent magnet 35, and the effect of suppressing demagnetization is further enhanced.
- FIG. 14 is a side sectional view showing the electric motor 1 of the second embodiment.
- the stator 5 is covered with a mold resin part 60 to form a mold stator 6.
- the mold resin part 60 is made of, for example, a thermosetting resin such as BMC (bulk molding compound).
- the mold resin portion 60 has an opening 62 on the left side (load side described later) in FIG. 14, and has a bearing support 61 on the opposite side (opposite load side described later).
- the rotor 3 is inserted from the opening 62 into a hollow portion inside the stator 5.
- the metal bracket 15 is attached to the opening 62 of the mold resin part 60.
- the bracket 15 holds one bearing 12 that supports the rotating shaft 11.
- a cap 14 is attached to the outside of the bracket 15 to prevent water or the like from entering the bearing 12.
- the bearing support 61 holds another bearing 13 that supports the rotating shaft 11.
- the rotating shaft 11 protrudes from the stator 5 to the left in FIG. 14, and a tip portion 11a is attached with, for example, an impeller of a blower. Therefore, the protruding side (the left side in FIG. 14) of the rotating shaft 11 is referred to as “load side”, and the opposite side (the right side in FIG. 14) is referred to as “anti-load side”.
- the substrate 7 is disposed on the non-load side of the stator 5.
- a magnetic sensor 71 and a drive circuit 72 for driving the electric motor 1 are mounted on the substrate 7.
- the magnetic sensor 71 is arranged so as to face the sensor magnet 36 attached to the rotor 3.
- the drive circuit 72 is the drive device 101 shown in FIG. However, the drive circuit 72 can be provided outside the electric motor 1 instead of on the substrate 7.
- Lead wires 73 are wired on the substrate 7.
- the lead wires 73 include a power supply lead wire for supplying power to the coil 55 of the stator 5 and a sensor lead wire for transmitting a signal of the magnetic sensor 71 to the outside.
- a lead wire lead-out part 74 for leading out the lead wire 73 to the outside is attached to the outer periphery of the mold resin part 60.
- the resin portion 4 described above is provided on the inner peripheral side of the rotor core 30, but also covers both axial end surfaces of the rotor core 30. Further, it is desirable that a part of the resin portion 4 enters the inside of the magnet insertion hole 31. Thus, the permanent magnet 35 can be prevented from dropping out of the magnet insertion hole 31.
- a circular sensor magnet (that is, a magnet for position detection) 36 is attached to the rotor core 30.
- the sensor magnet 36 is arranged on the side facing the substrate 7 in the axial direction of the rotor core 30, and is surrounded and held by the resin portion 4.
- the sensor magnets 36 have the same number of magnetic poles as the number of poles of the rotor 3 and are arranged at equal intervals in the circumferential direction.
- the magnetization direction of the sensor magnet 36 is an axial direction, but is not limited to this.
- the magnetic sensor 71 is formed of, for example, a Hall IC, and is arranged to face the sensor magnet 36 of the rotor 3.
- the magnetic sensor 71 detects a position in the circumferential direction of the rotor 3 (that is, a rotational position) based on a change in magnetic flux (N / S) from the sensor magnet 36, and outputs a detection signal.
- the magnetic sensor 71 is not limited to the Hall IC, but may be an MR element (Magneto-Resistive) element, a GMR (Giant-Magneto-Resistive) element, or a magnetic impedance element.
- the detection signal of the magnetic sensor 71 is output to the drive circuit 72.
- a detection signal of the magnetic sensor 71 is output to the drive circuit 72 via a sensor lead.
- the drive circuit 72 controls the current flowing through the coil 55 according to the relative rotation position of the rotor 2 with respect to the stator 5 based on the detection signal from the magnetic sensor 71.
- stator 5 is covered with the mold resin portion 60
- stator 5 is fixed to the inside of the shell by shrink fitting
- electric motor 1A described with reference to FIG. 14 is also applied to electric motor 1 of the first embodiment, except for rotor 3 and resin portion 4.
- FIG. 15 is a graph showing a comparison of the change in the demagnetization rate with respect to the demagnetization current between the electric motor 1 according to the first embodiment and the electric motor 1A according to the second embodiment.
- a curve S1 shows data of the electric motor 1 of the first embodiment
- a curve S2 shows data of the electric motor 1A of the second embodiment.
- the demagnetizing current refers to a current flowing through the coil 55 to generate a stator magnetic flux.
- the electric motor 1A of the second embodiment Since the electric motor 1A of the second embodiment has the consequent pole type rotor 3, the number of the permanent magnets 35 is smaller than that of the electric motor 1 of the first embodiment. Therefore, the portion demagnetized by the stator magnetic flux is small, and the demagnetization of the permanent magnet 35 is hard to occur. As a result, in the electric motor 1A of the second embodiment, the increase in the demagnetization rate when the demagnetizing current is increased is suppressed to be lower than that of the electric motor 1 of the first embodiment.
- motor 1A of the second embodiment has rotor 3 of a consequent pole type and has a small number of permanent magnets 35, and thus demagnetization occurs. Since there are few portions, demagnetization of the permanent magnet 35 can be more effectively prevented.
- the resin portion 4 (that is, the support portion) made of a non-magnetic material is provided between the rotor core 30 and the rotating shaft 11, the rotating shaft 11 which is likely to be generated in the consequent pole type rotor is provided. Magnetic flux leakage can be suppressed.
- the resin portion 4 is provided between the rotor core 30 and the rotating shaft 11, the resin portion 4 is not provided, and the rotor core 30 is rotated like the rotor core 20 of the first embodiment (FIG. 2).
- the shaft 11 may be fixed directly.
- the resin portion 4 as in the second embodiment may be provided between the rotor core 20 and the rotating shaft 11 in the first embodiment.
- FIG. 16A is a diagram illustrating a configuration of an air conditioner 500 to which the electric motor of each embodiment can be applied.
- the air conditioner 500 includes an outdoor unit 501, an indoor unit 502, and a refrigerant pipe 503 connecting these.
- the outdoor unit 501 has a blower (that is, an outdoor blower) 510.
- FIG. 16B is a cross-sectional view taken along line 16B-16B shown in FIG.
- the outdoor unit 501 has a housing 508 and a frame 509 fixed inside the housing 508.
- the motor 1 as a drive source of the blower 510 is fixed to the frame 509 with screws or the like.
- An impeller (blade portion) 511 is attached to the rotating shaft 11 of the electric motor 1 via a hub 512.
- FIG. 17 is a schematic diagram showing a refrigerant circuit of the air conditioner 500.
- the air conditioner 500 includes a compressor 504, a condenser 505, a throttle device (decompression device) 506, and an evaporator 507.
- the compressor 504, the condenser 505, the expansion device 506, and the evaporator 507 are connected by a refrigerant pipe 503 to form a refrigeration cycle. That is, the refrigerant circulates in the order of the compressor 504, the condenser 505, the expansion device 506, and the evaporator 507.
- the compressor 504, the condenser 505, and the expansion device 506 are provided in the outdoor unit 501.
- the evaporator 507 is provided in the indoor unit 502.
- the indoor unit 502 is provided with a blower (that is, an indoor blower) 520 that supplies indoor air to the evaporator 507.
- the operation of the air conditioner 500 is as follows.
- the compressor 504 compresses and sends out the sucked refrigerant.
- the condenser 505 exchanges heat between the refrigerant flowing from the compressor 504 and the outdoor air, condenses and liquefies the refrigerant, and sends it to the refrigerant pipe 503.
- the blower 510 of the outdoor unit 501 discharges the heat released when the refrigerant is condensed in the condenser 505 to the outside.
- the expansion device 506 adjusts the pressure and the like of the refrigerant flowing through the refrigerant pipe 503.
- the evaporator 507 performs heat exchange between the refrigerant brought into a low pressure state by the expansion device 506 and the indoor air, causes the refrigerant to deprive the heat of the air, evaporates (vaporizes), and sends the refrigerant to the refrigerant pipe 503.
- the blower 520 of the indoor unit 502 supplies the air whose heat has been deprived by the evaporator 507 (ie, cool air) to the room.
- the electric motors 1 and 1A of the above embodiments are configured to suppress the demagnetization of the permanent magnets 25 and 35. Therefore, by using the electric motor 1 as a power source of the blower 510, the operation efficiency of the air conditioner 500 can be improved over a long period of time, and energy consumption can be reduced.
- electric motors 1 and 1A of each embodiment are used as a drive source of blower (ie, outdoor blower) 510 of outdoor unit 501, they are used as a drive source of blower (ie, indoor blower) 520 of indoor unit 502. May be.
- the electric motors 1 and 1A of each embodiment are not limited to blowers, and may be used as a drive source of the compressor 504, for example.
- the electric motors 1 and 1A of each embodiment are not limited to the air conditioner 500, and may be used, for example, as electric motors for ventilation fans, home appliances, or machine tools.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
Description
<電動機の構成>
図1は、実施の形態1の電動機1を示す断面図である。電動機1は、回転可能なロータ2と、ロータ2を囲むように設けられた環状のステータ5とを備えたインナロータ型の電動機である。電動機1は、また、ロータ2に永久磁石25を埋め込んだ永久磁石埋込型電動機でもある。ロータ2とステータ5との間には、例えば0.4mmのエアギャップ(空隙)10が設けられている。
ステータ5は、ステータコア50と、ステータコア50に巻き付けられたコイル55とを有する。ステータコア50は、例えば厚さが0.2mm~0.5mmの磁性を有する積層要素を軸方向に複数枚積層し、カシメ等によって固定したものである。積層要素は、ここでは、鉄(Fe)を主成分とする電磁鋼板である。
図2は、ロータ2を示す断面図である。ロータ2は、回転軸C1を中心とする円筒状のロータコア20を有する。ロータコア20は、厚さ0.2~0.5mmの磁性を有する積層要素を軸方向に複数枚積層し、カシメ等により固定したものである。積層要素は、ここでは、鉄を主成分とする電磁鋼板である。なお、ロータコア20は、軟磁性材料と樹脂とを組み合わせた樹脂鉄心で構成してもよい。ロータ2の直径は、ここでは50mmである。
次に、永久磁石25の製造コストの低減と減磁の抑制について説明する。永久磁石25の減磁特性は、永久磁石25の厚さT1との相間がある。一般に、永久磁石25の厚さT1が厚いほど減磁が生じにくくなり(言い換えると減磁耐力が大きくなり)、厚さT1が薄いほど減磁が生じやすくなる(言い換えると減磁耐力が小さくなる)。
上記の通り、永久磁石25の厚さT1は、製造コスト低減のため、2.1mm以上が望ましい。一方、永久磁石25は、ロータコア20の磁石挿入孔21に挿入された状態で着磁されるのが一般的である。
次に、電動機1を駆動する駆動装置101について説明する。図10は、駆動装置101の構成を示すブロック図である。この駆動装置101は、電動機1に組み込まれる基板7(図14)に搭載されていてもよいし、電動機1の外部に設けられていても良い。
以上説明したように、この実施の形態1では、永久磁石25が2.1mm以上の厚さT1を有し、ロータ2とステータ5との最小間隔AGと、ティース51に巻き付けられるコイル55の巻き数Ntと、コイル55に流れる電流の過電流閾値Ipと、永久磁石25の保磁力の下限値Hctとが、Hct≧0.4×(Ip×Nt/AG)+410を満足することにより、永久磁石25の単位重量当たりの価格を抑えて製造コストを低減しながら、永久磁石25の減磁を抑制することができる。
次に、本発明の実施の形態2について説明する。実施の形態2の電動機1Aは、ロータ3の構成が、実施の形態1の電動機1と異なるものである。実施の形態2の電動機1Aのステータは、実施の形態1の電動機1のステータ5と同様に構成されている。
図11は、実施の形態2のロータ3を示す断面図である。ロータ3は、回転軸C1を中心とする円筒状のロータコア30を有する。ロータコア30は、厚さ0.2~0.5mmの磁性を有する積層要素を軸方向に複数枚積層し、カシメ等により固定したものである。積層要素の構成は、実施の形態1で説明した通りである。
図14は、実施の形態2の電動機1を示す側断面図である。ステータ5は、モールド樹脂部60によって覆われ、モールドステータ6を構成している。
以上説明したように、実施の形態2の電動機1Aは、実施の形態1で説明した効果に加えて、ロータ3がコンシクエントポール型であって永久磁石35の数が少なく、従って減磁が生じる部分が少ないため、永久磁石35の減磁をより効果的に防止することができる。
次に、上述した各実施の形態の電動機を適用した空気調和装置について説明する。図16(A)は、各実施の形態の電動機が適用可能な空気調和装置500の構成を示す図である。空気調和装置500は、室外機501と、室内機502と、これらを接続する冷媒配管503とを備える。室外機501は、送風機(すなわち室外送風機)510を有する。
Claims (14)
- 磁石挿入孔を有するロータコアと、前記磁石挿入孔に配置された永久磁石とを有し、回転軸を中心として回転可能なロータと、
前記ロータを囲むように設けられたステータであって、前記ロータに対向するティースを有するステータコアと、前記ティースに巻き付けられるコイルとを有するステータと
を備え、
前記永久磁石は、前記ステータに対向する方向に2.1mm以上の厚さを有し、前記厚さの方向に着磁され、
前記ロータと前記ステータとの最小間隔AG(mm)と、前記ティースにおける前記コイルの巻き数Ntと、前記コイルに流れる電流の過電流閾値Ip(A)と、前記永久磁石の保磁力の下限値Hct(kA/m)とが、
Hct≧0.4×(Ip×Nt/AG)+410
を満足する
電動機。 - 磁石挿入孔を有するロータコアと、前記磁石挿入孔に配置された永久磁石とを有し、回転軸を中心として回転可能なロータと、
前記ロータを囲むように設けられたステータであって、前記ロータに対向するティースを有するステータコアと、前記ティースに巻き付けられるコイルとを有するステータと
を備え、
前記永久磁石は、前記ステータに対向する方向に3mm以上の厚さを有し、前記厚さの方向に着磁され、
前記ロータと前記ステータとの最小間隔AG(mm)と、前記ティースにおける前記コイルの巻き数Ntと、前記コイルに流れる電流の過電流閾値Ip(A)と、前記永久磁石の保磁力の下限値Hct(kA/m)とが、
Hct≧0.32×(Ip×Nt/AG)+350
を満足する
電動機。 - 前記永久磁石の前記径方向の厚さは、4mm以下である
請求項1または2に記載の電動機。 - 前記ロータは、前記回転軸を中心とする周方向における前記磁石挿入孔の中心に極中心を有し、前記周方向における前記磁石挿入孔の外側に極間を有し、
前記ロータの外周は、前記極中心を通って延在する第1の外周部と、前記極間を通って延在する第2の外周部とを有し、
前記第1の外周部から前記ステータまでの距離は、前記第2の外周部から前記ステータまでの距離よりも近い
請求項1から3までの何れか1項に記載の電動機。 - 前記第2の外周部上の第1の点と前記回転軸とを結ぶ直線上に、前記永久磁石の前記周方向の端部が位置している
請求項4に記載の電動機。 - 前記第2の外周部上の第1の点と前記回転軸とを結ぶ直線上に、前記永久磁石の前記周方向の一端部の前記径方向の外側の角部が位置している
請求項4または5に記載の電動機。 - 前記ロータは、前記回転軸を中心とする周方向における前記磁石挿入孔の少なくとも一方の側に、前記磁石挿入孔につながる空隙を有し、
前記永久磁石の前記周方向の一端部の前記径方向の外側の角部が、前記空隙の内部に位置し、前記ロータコアには接していない
請求項1から6までの何れか1項に記載の電動機。 - 前記永久磁石によって第1の磁極が構成され、
前記ロータコアの一部によって第2の磁極が構成される
請求項1から7までの何れか1項に記載の電動機。 - 回転シャフトと、
前記回転シャフトと前記ロータコアとの間に設けられ、非磁性材料で形成された支持部と
を備えた請求項8に記載の電動機。 - 前記永久磁石の保磁力の前記下限値Hctは、前記電動機の使用温度範囲の最高温度での保磁力である
請求項1から9までの何れか1項に記載の電動機。 - Ip×Nt/AGの値が、750A/mm以上である
請求項1から10までの何れか1項に記載の電動機。 - 前記コイルに電流を供給するインバータと、前記インバータを制御する制御装置とを有し、
前記制御装置は、前記インバータの電流値が前記過電流閾値を超えると、前記インバータを停止する
請求項1から11までの何れか1項に記載の電動機。 - 請求項1から12までの何れか1項に記載の電動機と、
前記電動機によって回転する羽根部と
を備えた送風機。 - 室外機と、室内機と、前記室外機と前記室内機とを連結する冷媒配管とを備え、
前記室外機および前記室内機の少なくとも一方は、請求項13に記載の送風機を有する
空気調和装置。
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/059,511 US11949290B2 (en) | 2018-06-27 | 2018-06-27 | Motor that suppresses demagnetization of permanent magnet, fan, and air conditioner |
CN201880094688.0A CN112335156B (zh) | 2018-06-27 | 2018-06-27 | 电动机、送风机以及空调装置 |
JP2020526785A JP7038819B2 (ja) | 2018-06-27 | 2018-06-27 | 電動機、送風機および空気調和装置 |
PCT/JP2018/024407 WO2020003414A1 (ja) | 2018-06-27 | 2018-06-27 | 電動機、送風機および空気調和装置 |
KR1020207036435A KR102579646B1 (ko) | 2018-06-27 | 2018-06-27 | 전동기, 송풍기 및 공기 조화 장치 |
EP24162208.3A EP4358369A2 (en) | 2018-06-27 | 2018-06-27 | Motor, fan, and air conditioner |
EP18924086.4A EP3817194A4 (en) | 2018-06-27 | 2018-06-27 | ELECTRIC MOTOR, BLOWER AND AIR CONDITIONING DEVICE |
KR1020237024737A KR20230114323A (ko) | 2018-06-27 | 2018-06-27 | 전동기, 송풍기 및 공기 조화 장치 |
CN202311524434.7A CN117559686A (zh) | 2018-06-27 | 2018-06-27 | 电动机、送风机以及空调装置 |
US18/422,285 US20240171023A1 (en) | 2018-06-27 | 2024-01-25 | Motor that suppresses demagnetization of permanent magnet, fan, and air conditioner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2018/024407 WO2020003414A1 (ja) | 2018-06-27 | 2018-06-27 | 電動機、送風機および空気調和装置 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/059,511 A-371-Of-International US11949290B2 (en) | 2018-06-27 | 2018-06-27 | Motor that suppresses demagnetization of permanent magnet, fan, and air conditioner |
US18/422,285 Continuation US20240171023A1 (en) | 2018-06-27 | 2024-01-25 | Motor that suppresses demagnetization of permanent magnet, fan, and air conditioner |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2020003414A1 true WO2020003414A1 (ja) | 2020-01-02 |
Family
ID=68986711
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2018/024407 WO2020003414A1 (ja) | 2018-06-27 | 2018-06-27 | 電動機、送風機および空気調和装置 |
Country Status (6)
Country | Link |
---|---|
US (2) | US11949290B2 (ja) |
EP (2) | EP4358369A2 (ja) |
JP (1) | JP7038819B2 (ja) |
KR (2) | KR102579646B1 (ja) |
CN (2) | CN112335156B (ja) |
WO (1) | WO2020003414A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111555481A (zh) * | 2020-05-26 | 2020-08-18 | 安徽美芝精密制造有限公司 | 电机、压缩机和制冷设备 |
CN111555480A (zh) * | 2020-05-26 | 2020-08-18 | 安徽美芝精密制造有限公司 | 电机、压缩机和制冷设备 |
WO2022258385A2 (en) | 2021-06-07 | 2022-12-15 | Unilever Ip Holdings B.V. | Compositions and methods for controlling sweat production |
KR20230065631A (ko) * | 2021-11-05 | 2023-05-12 | 주식회사 현대케피코 | 웨지 로터 타입 매입형 영구자석 모터 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101892843B1 (ko) * | 2017-02-09 | 2018-08-28 | 박용식 | 트랜스포머 침대 |
JP6952765B2 (ja) * | 2017-03-27 | 2021-10-20 | 三菱電機株式会社 | 電動機および空気調和装置 |
EP3618228B1 (de) * | 2018-08-30 | 2021-06-02 | Etel S.A. | Statoranordnung für einen rotatorischen synchronmotor |
KR20200086087A (ko) * | 2019-01-08 | 2020-07-16 | 엘지이노텍 주식회사 | 모터 |
US11973370B2 (en) * | 2021-03-15 | 2024-04-30 | Anhui Meizhi Precision Manufacturing Co., Ltd. | Motor, compressor and refrigeration device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001178046A (ja) | 1993-12-28 | 2001-06-29 | Sanyo Electric Co Ltd | 圧縮機 |
JP2013162557A (ja) * | 2012-02-01 | 2013-08-19 | Suzuki Motor Corp | 電動回転機 |
JP2015159691A (ja) * | 2014-02-25 | 2015-09-03 | 学校法人 東洋大学 | 永久磁石回転電機及び永久磁石回転電機制御装置 |
WO2017077590A1 (ja) * | 2015-11-04 | 2017-05-11 | 三菱電機株式会社 | ステータ、電動機、圧縮機、及び冷凍空調装置 |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5666015A (en) | 1993-04-30 | 1997-09-09 | Sanyo Electric Co., Ltd. | Electric motor for a compressor with a rotor with combined balance weights and oil separation disk |
JP3371314B2 (ja) * | 1995-03-24 | 2003-01-27 | セイコーエプソン株式会社 | Dcブラシレスモータおよび制御装置 |
WO1998019389A1 (fr) * | 1996-10-31 | 1998-05-07 | Ebara Corporation | Machine tournante a regulateur et inverseur integres |
CN1287503C (zh) * | 2002-03-20 | 2006-11-29 | 大金工业株式会社 | 永久磁铁型电动机及使用该电动机的压缩机 |
JP2004173415A (ja) | 2002-11-20 | 2004-06-17 | Mitsubishi Electric Corp | 永久磁石型回転電機及び風力発電用永久磁石型発電機 |
JP2004260926A (ja) | 2003-02-26 | 2004-09-16 | Matsushita Electric Ind Co Ltd | 電動機およびそれを搭載した電動圧縮機 |
JP5863410B2 (ja) * | 2011-11-16 | 2016-02-16 | 信越化学工業株式会社 | 回転子及びスポーク型ipm永久磁石式回転機 |
WO2013114542A1 (ja) | 2012-01-30 | 2013-08-08 | 三菱電機株式会社 | 永久磁石埋込型電動機の回転子、及びこの回転子を備えた電動機、及びこの電動機を備えた圧縮機、及びこの圧縮機を備えた空気調和機 |
WO2014068655A1 (ja) * | 2012-10-30 | 2014-05-08 | 三菱電機株式会社 | 永久磁石埋込型電動機及びそれを備えた冷凍空調装置 |
EP2933903B1 (en) * | 2012-12-12 | 2020-01-22 | Mitsubishi Electric Corporation | Rotor for motor |
KR101701102B1 (ko) | 2014-01-06 | 2017-01-31 | 미쓰비시덴키 가부시키가이샤 | 영구 자석형 회전 전기 |
JP5963835B2 (ja) | 2014-12-03 | 2016-08-03 | 三菱電機株式会社 | 圧縮機 |
JP2017028862A (ja) | 2015-07-22 | 2017-02-02 | 三菱電機株式会社 | 回転子、回転電機、電動圧縮機および冷凍空調装置 |
JP6568999B2 (ja) * | 2015-07-31 | 2019-08-28 | 日産自動車株式会社 | 永久磁石同期モータ |
JP6585974B2 (ja) | 2015-09-07 | 2019-10-02 | アイチエレック株式会社 | 永久磁石電動機 |
JP6452841B2 (ja) * | 2015-11-02 | 2019-01-16 | 三菱電機株式会社 | 電動機、ロータ、圧縮機および冷凍空調装置 |
DE112015007131T5 (de) * | 2015-11-18 | 2018-08-02 | Mitsubishi Electric Corporation | Elektromotor und Klimaanlage |
WO2017158680A1 (ja) | 2016-03-14 | 2017-09-21 | 三菱電機株式会社 | 電動パワーステアリング装置用の3相2重化モータ装置 |
JP6645351B2 (ja) * | 2016-05-12 | 2020-02-14 | スズキ株式会社 | 回転電機 |
US11456632B2 (en) | 2016-07-15 | 2022-09-27 | Mitsubishi Electric Corporation | Consequent-pole type rotor, electric motor, air conditioner, and method for manufacturing consequent-pole type rotor |
JP2017153356A (ja) | 2017-03-31 | 2017-08-31 | 三菱電機株式会社 | 電動機及び圧縮機 |
-
2018
- 2018-06-27 EP EP24162208.3A patent/EP4358369A2/en active Pending
- 2018-06-27 KR KR1020207036435A patent/KR102579646B1/ko active IP Right Grant
- 2018-06-27 JP JP2020526785A patent/JP7038819B2/ja active Active
- 2018-06-27 CN CN201880094688.0A patent/CN112335156B/zh active Active
- 2018-06-27 US US17/059,511 patent/US11949290B2/en active Active
- 2018-06-27 WO PCT/JP2018/024407 patent/WO2020003414A1/ja unknown
- 2018-06-27 KR KR1020237024737A patent/KR20230114323A/ko not_active Application Discontinuation
- 2018-06-27 EP EP18924086.4A patent/EP3817194A4/en active Pending
- 2018-06-27 CN CN202311524434.7A patent/CN117559686A/zh active Pending
-
2024
- 2024-01-25 US US18/422,285 patent/US20240171023A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001178046A (ja) | 1993-12-28 | 2001-06-29 | Sanyo Electric Co Ltd | 圧縮機 |
JP2013162557A (ja) * | 2012-02-01 | 2013-08-19 | Suzuki Motor Corp | 電動回転機 |
JP2015159691A (ja) * | 2014-02-25 | 2015-09-03 | 学校法人 東洋大学 | 永久磁石回転電機及び永久磁石回転電機制御装置 |
WO2017077590A1 (ja) * | 2015-11-04 | 2017-05-11 | 三菱電機株式会社 | ステータ、電動機、圧縮機、及び冷凍空調装置 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111555481A (zh) * | 2020-05-26 | 2020-08-18 | 安徽美芝精密制造有限公司 | 电机、压缩机和制冷设备 |
CN111555480A (zh) * | 2020-05-26 | 2020-08-18 | 安徽美芝精密制造有限公司 | 电机、压缩机和制冷设备 |
CN111555480B (zh) * | 2020-05-26 | 2021-04-30 | 安徽美芝精密制造有限公司 | 电机、压缩机和制冷设备 |
WO2022258385A2 (en) | 2021-06-07 | 2022-12-15 | Unilever Ip Holdings B.V. | Compositions and methods for controlling sweat production |
KR20230065631A (ko) * | 2021-11-05 | 2023-05-12 | 주식회사 현대케피코 | 웨지 로터 타입 매입형 영구자석 모터 |
KR102621457B1 (ko) | 2021-11-05 | 2024-01-05 | 주식회사 현대케피코 | 웨지 로터 타입 매입형 영구자석 모터 |
Also Published As
Publication number | Publication date |
---|---|
CN112335156B (zh) | 2023-11-21 |
JPWO2020003414A1 (ja) | 2020-12-17 |
KR102579646B1 (ko) | 2023-09-15 |
EP4358369A2 (en) | 2024-04-24 |
JP7038819B2 (ja) | 2022-03-18 |
CN112335156A (zh) | 2021-02-05 |
KR20230114323A (ko) | 2023-08-01 |
US11949290B2 (en) | 2024-04-02 |
EP3817194A4 (en) | 2021-06-23 |
EP3817194A1 (en) | 2021-05-05 |
US20210211003A1 (en) | 2021-07-08 |
US20240171023A1 (en) | 2024-05-23 |
KR20210011967A (ko) | 2021-02-02 |
CN117559686A (zh) | 2024-02-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP7038819B2 (ja) | 電動機、送風機および空気調和装置 | |
JP6964672B2 (ja) | ロータ、電動機、送風機および空気調和装置 | |
US11342802B2 (en) | Consequent-pole type rotor, electric motor, compressor, blower, and air conditioner | |
US11394260B2 (en) | Rotor, motor, fan, and air conditioning apparatus | |
US20110241467A1 (en) | Permanent magnet motor | |
WO2022019074A1 (ja) | 電動機 | |
JPWO2022019074A5 (ja) | ||
US10784733B2 (en) | Motor and air conditioning apparatus | |
JP7098047B2 (ja) | モータ、ファン、および空気調和機 | |
US11909259B2 (en) | Stator, motor, fan, air conditioner, and method for manufacturing stator | |
WO2021171385A1 (ja) | 送風機および空気調和装置 | |
US20230006489A1 (en) | Motor, fan, and air conditioner | |
WO2023073757A1 (ja) | ロータ、電動機、送風機および空気調和装置 | |
JP2005192264A (ja) | 電動機 |
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: 18924086 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2020526785 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 20207036435 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2018924086 Country of ref document: EP Effective date: 20210127 |