WO2021214825A1 - ロータ、モータ、圧縮機および空気調和装置 - Google Patents
ロータ、モータ、圧縮機および空気調和装置 Download PDFInfo
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- WO2021214825A1 WO2021214825A1 PCT/JP2020/017037 JP2020017037W WO2021214825A1 WO 2021214825 A1 WO2021214825 A1 WO 2021214825A1 JP 2020017037 W JP2020017037 W JP 2020017037W WO 2021214825 A1 WO2021214825 A1 WO 2021214825A1
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- end side
- width
- permanent magnet
- edge
- gap
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- 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]
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- 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]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
- H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
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- 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
Definitions
- This disclosure relates to rotors, motors, compressors and air conditioners.
- the permanent magnet is arranged in the magnet insertion hole formed in the rotor core. Protrusions for positioning the permanent magnet are provided on both sides of the magnet insertion hole (see, for example, Patent Document 1).
- the magnetic flux from the stator may cause demagnetization of the permanent magnet.
- the magnetic flux from the stator easily flows to the permanent magnet via the protrusions, and the permanent magnet is likely to be demagnetized.
- the present disclosure has been made to solve the above problems, and an object of the present disclosure is to suppress demagnetization of a permanent magnet.
- the rotor of the present disclosure has an outer circumference extending in the circumferential direction centered on the axis, a magnet insertion hole located inside the outer circumference in the radial direction centered on the axis, and a circumferential end of the magnet insertion hole. It has a rotor core having a connecting gap and a permanent magnet arranged in a magnet insertion hole and having a magnetic pole surface on the outer side in the radial direction.
- the magnet insertion hole has an outer end edge of the insertion hole located on the outer side in the radial direction and an inner end edge of the insertion hole located on the inner side in the radial direction.
- the gap has an outer edge extending from the circumferential end of the outer edge of the insertion hole toward the outer periphery, and an inner edge facing the outer edge.
- the gap includes a first portion in which the outer edge and the inner edge face each other with a width W1 and a second portion in which the outer edge and the inner edge face each other with a width W2 wider than the width W1.
- the second part is located between the first part and the permanent magnet. At least a part of the first portion is located outside in the radial direction with respect to the reference line extending the magnetic pole plane in the plane orthogonal to the axis line.
- a short-circuit path of the stator magnetic flux passing through the narrow first portion of the gap W1 is formed. Since the first portion is located on the outer peripheral side of the magnetic pole surface of the permanent magnet, it is difficult for the magnetic flux flowing through the short-circuit path to reach the permanent magnet. Therefore, demagnetization of the permanent magnet can be suppressed.
- FIG. 1 It is sectional drawing which shows the motor of Embodiment 1.
- FIG. It is sectional drawing which shows the rotor of Embodiment 1.
- FIG. It is sectional drawing which shows the part of the rotor of Embodiment 1 enlarged.
- FIG. It is a figure which shows the flow of the reverse magnetic flux in the rotor of the comparative example 1.
- FIG. It is a figure which shows the flow of the reverse magnetic flux in the rotor of the comparative example 2.
- FIG. 1 It is sectional drawing which shows the motor of Embodiment 1.
- FIG. It is sectional drawing which shows the rotor of Embodiment 1.
- FIG. It is sectional drawing which shows the part of the rotor of Embodiment 1
- FIG. 5A is a cross-sectional view showing the rotor of the fifth embodiment
- FIG. 3B is an enlarged cross-sectional view showing a part of the rotor.
- sectional drawing (A) which shows the rotor of Embodiment 6, and sectional drawing (B) which shows a part of the rotor enlarged.
- sectional drawing (A) which shows the rotor of Embodiment 7, and sectional drawing (B) which shows a part of the rotor enlarged.
- sectional drawing (A) which shows the rotor of Embodiment 8, and sectional drawing (B) which shows a part of the rotor enlarged. It is sectional drawing (A) which shows the rotor of Embodiment 9, and sectional drawing (B) which shows a part of the rotor enlarged. It is sectional drawing which shows the compressor to which the motor of each embodiment is applicable. It is a figure which shows the air conditioner which has the compressor of FIG.
- FIG. 1 is a cross-sectional view showing the motor 100 of the first embodiment.
- the motor 100 is a permanent magnet embedded motor in which a permanent magnet 20 is embedded in a rotor 1, and is used, for example, in a compressor 300 (FIG. 19).
- the motor 100 has a rotatable rotor 1 and a stator 5 provided so as to surround the rotor 1.
- An air gap of, for example, 0.3 to 1.0 mm is formed between the stator 5 and the rotor 1.
- the stator 5 is fixed to a cylindrical shell 6 that is part of the compressor 300.
- the direction of the axis C1 which is the rotation axis of the rotor 1 is referred to as "axial direction”.
- the circumferential direction around the axis C1 (indicated by the arrow R1 in FIG. 1) is referred to as a “circumferential direction”.
- the radial direction centered on the axis C1 is referred to as a "diameter direction”.
- the stator 5 has a stator core 50, an insulating portion 54 attached to the stator core 50, and a coil 55 wound around the stator core 50 via the insulating portion 54.
- the stator core 50 is formed by laminating steel plates in the axial direction and fixing them by caulking or the like.
- the steel plate is, for example, an electromagnetic steel plate.
- the plate thickness of the steel plate is, for example, 0.1 to 0.7 mm, and here 0.35 mm.
- the stator core 50 has an annular yoke 51 centered on the axis C1 and a plurality of teeth 52 extending radially inward from the yoke 51.
- the outer circumference of the yoke 51 is fixed to the inside of the shell 6.
- Teeth 52 are formed at regular intervals in the circumferential direction.
- the number of teeth 52 is 9 here, but it may be 2 or more.
- a slot 53 for accommodating the coil 55 is formed between the adjacent teeth 52.
- the stator core 50 has a plurality of divided cores 50A divided for each tooth 52.
- the number of split cores 50A is, for example, 9. These split cores 50A are joined by a split surface 58 formed on the yoke 51 and are connected in the circumferential direction.
- the stator core 50 is not limited to a configuration in which a plurality of divided cores 50A are connected.
- the insulating portion 54 is provided between the stator core 50 and the coil 55.
- the insulating portion 54 is composed of, for example, an insulator arranged at the axial end portion of the stator core 50 and an insulating film arranged on the inner surface of the slot 53.
- the insulator is made of a resin such as polybutylene terephthalate (PBT).
- the insulating film is made of a resin such as polyethylene terephthalate (PET) and has a thickness of 0.1 to 0.2 mm.
- PET polyethylene terephthalate
- the insulating portion 54 is not limited to such a configuration, and may be any one that can insulate the stator core 50 and the coil 55.
- the coil 55 is composed of, for example, a magnet wire, and is wound around the teeth 52 via an insulating portion 54.
- the wire diameter of the coil 55 is, for example, 0.8 mm.
- the coil 55 is wound around each tooth 52 by a concentrated winding, for example, for 70 turns.
- the wire diameter and the number of turns of the coil 55 are determined according to the required rotation speed, torque, applied voltage, or cross-sectional area of the slot 53.
- Caulking portions 56a and 56b are formed on the yoke 51.
- the caulking portions 56a and 56b fix a plurality of steel plates constituting the stator core 50 in the axial direction.
- the caulking portion 56a is formed on a linear line in the radial direction passing through the circumferential center of the teeth 52, and the caulking portion 56b is formed at two positions symmetrical in the circumferential direction with the straight line interposed therebetween.
- the number and arrangement of the crimped portions 56a and 56b can be changed as appropriate.
- a recess 57 is formed on the outer circumference of the yoke 51.
- a passage for the refrigerant in the compressor 300 is formed between the recess 57 and the shell 6.
- the rotor 1 has a cylindrical rotor core 10, a permanent magnet 20 attached to the rotor core 10, and a shaft 25 fixed to a central portion of the rotor core 10.
- the central axis of the shaft 25 is the axis C1 described above.
- the rotor core 10 has an outer circumference 10a and an inner circumference 10b. Both the outer circumference 10a and the inner circumference 10b are annular around the axis C1.
- the rotor core 10 is made by laminating steel plates in the axial direction and integrating them by caulking or the like.
- the steel plate is, for example, an electromagnetic steel plate.
- the plate thickness of the steel plate is, for example, 0.1 to 0.7 mm, and here 0.35 mm.
- a shaft 25 is fixed to the inner circumference 10b of the rotor core 10 by shrink fitting or press fitting.
- a plurality of magnet insertion holes 11 are formed along the outer circumference 10a of the rotor core 10.
- the plurality of magnet insertion holes 11 are formed at equal intervals in the circumferential direction.
- the magnet insertion hole 11 reaches from one end to the other end of the rotor core 10 in the axial direction.
- the magnet insertion hole 11 extends linearly in a plane orthogonal to the axis C1.
- the magnet insertion hole 11 may have a V-shape or a curved shape (see FIGS. 13 (A) and 18 (A)).
- Each magnet insertion hole 11 corresponds to one magnetic pole.
- the number of magnet insertion holes 11 here is 6, so the number of magnetic poles is 6.
- the number of magnetic poles is not limited to 6, and may be 2 or more.
- Permanent magnets 20 adjacent to each other in the circumferential direction have opposite poles on the outer side in the radial direction.
- the permanent magnet 20 is a flat plate-shaped member, has a width in the circumferential direction of the rotor core 10, and has a thickness in the radial direction.
- the thickness of the permanent magnet 20 is, for example, 2 mm.
- the permanent magnet 20 is composed of, for example, a neodymium rare earth magnet containing neodymium (Nd), iron (Fe) and boron (B).
- the permanent magnet 20 is magnetized in the thickness direction.
- Neodymium rare earth magnets have the property that the coercive force decreases as the temperature rises.
- the temperature of the permanent magnet 20 reaches 100 ° C. or higher, and the coercive force decreases at a rate of decrease of ⁇ 0.5 to ⁇ 0.6% / K depending on the temperature. Therefore, dysprosium (Dy) may be added to the permanent magnet 20 to improve the coercive force.
- Dy dysprosium
- Holes 102 and 103 serving as a passage for the refrigerant are formed inside the magnet insertion hole 11 in the radial direction.
- the hole 102 is formed at a position corresponding to the center of the pole, and the hole 103 is formed at a position corresponding to the space between the poles.
- the arrangement of the holes 102 and 103 can be changed as appropriate.
- FIG. 2 is a diagram showing a region corresponding to one magnetic pole of the rotor 1, that is, a region including one magnet insertion hole 11.
- the center of the magnet insertion hole 11 in the circumferential direction is the polar center P.
- a straight line in the radial direction passing through the pole center P is referred to as a magnetic pole center line.
- the space between adjacent magnetic poles is M between poles.
- the magnet insertion hole 11 extends in a direction orthogonal to the magnetic pole center line.
- the permanent magnet 20 has a magnetic pole surface 20a on the outer side in the radial direction, a magnetic pole surface 20b on the inner side in the radial direction, and end faces 20c on both sides in the circumferential direction.
- the magnetic pole surface 20a is also referred to as a first magnetic pole surface
- the magnetic pole surface 20b is also referred to as a second magnetic pole surface.
- the magnetic pole surfaces 20a and 20b both extend in a direction orthogonal to the magnetic pole center line.
- An extension of the magnetic pole surface 20a in a plane orthogonal to the axis C1 is defined as a reference line L1.
- the reference line L1 is a straight line in the first embodiment, but is not limited to the straight line (see FIG. 18 (A)).
- the magnet insertion hole 11 has an outer end side 11a on the outer side in the radial direction and an inner end side 11b on the inner side in the radial direction.
- the outer edge 11a is also referred to as the outer edge of the insertion hole.
- the inner edge 11b is also referred to as the inner edge of the insertion hole.
- the outer end side 11a of the magnet insertion hole 11 faces the magnetic pole surface 20a of the permanent magnet 20, and the inner end side 11b of the magnet insertion hole 11 faces the magnetic pole surface 20b of the permanent magnet 20.
- Voids 12 are formed on both sides of the magnet insertion hole 11 in the circumferential direction.
- the gap 12 is provided to suppress leakage of magnetic flux between adjacent magnetic poles.
- protrusions 14 that come into contact with the end faces 20c of the permanent magnet 20 are formed on both sides of the magnet insertion hole 11 in the circumferential direction.
- the protrusion 14 is formed so as to abut the end surface 20c of the permanent magnet 20 on the end side portion 123 (FIG. 3) of the inner end side 12b described later of the gap 12.
- the protrusion 14 has a tip 14a on the outer side in the radial direction, a side end 14b that abuts on the end surface 20c of the permanent magnet 20, and a side end 14c on the opposite side to the side end 14b.
- the side end 14b of the protrusion 14 comes into contact with the end surface 20c of the permanent magnet 20, the permanent magnet 20 is positioned so as not to move in the magnet insertion hole 11.
- FIG. 3 is an enlarged view of a part of the rotor 1.
- a slit 101 is formed on the radial outer side of the magnet insertion hole 11.
- the slit 101 has a side 111 extending along the outer circumference 10a of the rotor core 10, a side 112 extending along the magnet insertion hole 11, and sides 113, 114 inclined so as to approach the polar center P toward the outer side in the radial direction. And have.
- Two slits 101 (FIG. 2) symmetrical with respect to the pole center P are formed on each magnetic pole.
- the slit 101 is for smoothing the distribution of magnetic flux from the permanent magnet 20 toward the stator 5 and suppressing torque pulsation.
- the number, arrangement and shape of the slits 101 are arbitrary.
- the rotor core 10 does not necessarily have to have the slit 101.
- the gap 12 is connected to the circumferential end of the magnet insertion hole 11.
- the portion into which the permanent magnet 20 is inserted is the magnet insertion hole 11, and the portion located outside the permanent magnet 20 in the circumferential direction is the void 12.
- the gap 12 extends along the reference line L1 from the circumferential end of the magnet insertion hole 11, and further extends radially outward, that is, toward the outer circumference 10a of the rotor core 10, beyond the above-mentioned reference line L1. Exists.
- the gap 12 includes an outer end 12a extending from the outer end 11a of the magnet insertion hole 11, an inner end 12b extending from the inner end 11b of the magnet insertion hole 11, and a rotor core 10. It has a peripheral end side 12c extending along the outer circumference 10a of the magnet.
- the outer end side 12a has an end side portion 121 located on an extension line of the outer end side 11a of the magnet insertion hole 11 and an end side portion 122 extending from the end of the end side portion 121 toward the outer circumference 10a.
- the end edge portion 121 is also referred to as a first end edge portion.
- the end edge portion 122 is also referred to as a second end edge portion.
- the inner end side 12b has an end side portion 123 located on an extension line of the inner end side 11b of the magnet insertion hole 11 and an end side portion 124 extending from the end of the end side portion 123 toward the outer circumference 10a.
- the end edge portion 123 is also referred to as a first end edge portion.
- the end edge portion 124 is also referred to as a second end edge portion.
- the outer edge 12a is located closer to the pole center P, and the inner edge 12b is located closer to the interpole M.
- the outer edge 12a and the inner edge 12b face each other. More specifically, the end side portion 121 of the outer end side 12a and the end side portion 123 of the inner end side 12b face each other, and the end side portion 122 of the outer end side 12a and the end side portion 124 of the inner end side 12b Are opposed to each other.
- the edge portions 121 and 123 are parallel to each other, and the end edge portions 122 and 124 are parallel to each other, but they do not necessarily have to be parallel to each other.
- the peripheral end side 12c connects the radial outer end portion of the outer end side 12a and the radial outer end portion of the inner end side 12b.
- a thin-walled portion is formed between the peripheral edge 12c and the outer circumference 10a of the rotor core 10. It is desirable that the width of the thin portion is as narrow as possible in order to suppress the leakage flux between the adjacent magnetic poles.
- the width of the thin portion is the same as the thickness of the steel plate of the rotor core 10.
- the inner end side 12b is formed with a convex portion 13 projecting toward the outer end side 12a.
- the convex portion 13 projects from the end side portion 124 of the inner end side 12b toward the end side portion 122 of the outer end side 12a.
- the convex portion 13 has a tip 13a facing the outer end side 12a of the gap 12, a side end 13b facing the peripheral end side 12c, and a side end 13c facing the end face 20c of the permanent magnet 20.
- a part of the tip 13a of the convex portion 13 is located radially outside the reference line L1. However, the entire tip 13a of the convex portion 13 may be located radially outside the reference line L1. That is, at least a part of the tip 13a of the convex portion 13 may be located radially outside the reference line L1.
- the region between the outer edge 12a of the gap 12 and the tip 13a of the convex portion 13 is defined as the first portion A1.
- the first portion A1 is, here, a region between the end edge portion 122 of the outer edge portion 12a and the tip end 13a of the convex portion 13.
- the width of the first portion A1, that is, the shortest distance between the outer edge 12a of the gap 12 and the tip 13a of the convex portion 13 is defined as the width W1.
- the region on the permanent magnet 20 side of the first portion A1 where the distance between the outer end side 12a and the inner end side 12b is the shortest is the end side portion 121 of the outer end side 12a and the tip of the protrusion 14. This is the area with 14a. This region is defined as the second part A2.
- the width of the second portion A2, that is, the shortest distance between the outer edge 12a of the gap 12 and the tip 14a of the protrusion 14 is defined as the width W2.
- the void 12 also has a third portion A3 having a width W3 wider than the width W1 on the outer circumference 10a side of the first portion A1.
- the width W3 is the shortest distance between the outer edge 12a and the inner edge 12b on the outer circumference 10a side of the first portion A1.
- the width W3 is wider than the width W2 (W2 ⁇ W3).
- the width W2 and the width W3 may be equal.
- the void 12 includes a first portion A1 having a width W1, a second portion A2 having a width W2 wider than the width W1, and a third portion A3 having a width W3 wider than the width W1.
- the second portion A2 is located on the permanent magnet 20 side of the first portion A1, that is, between the first portion A1 and the permanent magnet 20.
- the third portion A3 is located on the outer circumference 10a side of the first portion A1, that is, between the first portion A1 and the outer circumference 10a.
- a part of the first portion A1 of the gap 12 is located on the outer circumference 10a side, that is, on the outer side in the radial direction with respect to the reference line L1.
- the entire first portion A1 of the gap 12 may be located radially outside the reference line L1. That is, at least a part of the first portion A1 may be located radially outside the reference line L1.
- the shortest distance from the end face 20c of the permanent magnet 20 to the first portion A1 of the gap 12 is defined as the distance D1.
- This distance D1 is equal to or greater than the width W1 of the first portion A1 of the gap 12 (D1 ⁇ W1).
- FIG. 4 is a diagram showing a rotor 1I of Comparative Example 1.
- the rotor 1I of Comparative Example 1 is different from the rotor 1 of the first embodiment in that the gap 12 is not provided with the convex portion 13 (FIGS. 2 and 3).
- the rotor 1I of Comparative Example 1 is configured in the same manner as the rotor 1 of the first embodiment.
- a larger current may flow through the coil 55 of the stator 5 than in normal operation. For example, when the load of the motor 100 is large, the operation of the motor 100 is locked, when the motor 100 is started, or when the coil 55 of the stator 5 is short-circuited.
- FIG. 5 is a diagram showing the flow of the reverse magnetic flux from the stator 5 in the rotor 1I. Since the reverse magnetic flux flowing into the rotor core 10 tries to flow through a portion having a small magnetic resistance, it bypasses the magnet insertion hole 11 and the gap 12 having a large magnetic resistance, and is between the outer circumference 10a of the rotor core 10 and the gap 12. Head to the thin part. However, since the magnetic path is narrow in the thin-walled portion, magnetic saturation occurs when a constant magnetic flux flows, and the magnetic flux does not flow. Since the magnet insertion hole 11 and the gap 12 are hollow inside, the magnetic resistance is large, but the width of the gap 12 is narrowed in the portion where the protrusion 14 is formed, so that the magnetic resistance is locally reduced.
- the reverse magnetic flux from the stator 5 flows concentrated on the protrusion 14 as shown by the arrow F. Since the protrusion 14 is in contact with the end face 20c of the permanent magnet 20, when the reverse magnetic flux is concentrated on the protrusion 14, demagnetization occurs on the end face 20c of the permanent magnet 20.
- FIG. 6 is a diagram showing a rotor 1J of Comparative Example 2.
- the rotor 1J of Comparative Example 2 is different from the rotor 1I of Comparative Example 1 (FIGS. 4 and 5) in that a protrusion 9 is provided on the outer end side 12a of the gap 12. The protrusion 9 projects toward the protrusion 14 and faces the protrusion 14.
- FIG. 7 is a diagram showing the flow of the reverse magnetic flux from the stator 5 in the rotor 1J of Comparative Example 2.
- a protrusion 9 is provided on the outer end side 12a of the gap 12, and the outer peripheral region of the rotor core 10 and the protrusion 9 are continuous. At the portion of the gap 12 where the protrusions 9 and 14 face each other, the magnetic resistance is locally reduced.
- the reverse magnetic flux from the stator 5 flows from the outer peripheral region of the rotor core 10 to the protrusion 14 via the protrusion 9 as shown by the arrow F.
- the reverse magnetic flux is concentrated on the protrusion 14, demagnetization occurs on the end face 20c of the permanent magnet 20 as in Comparative Example 1.
- magnetic saturation occurs in the protrusion 9, magnetic flux flows in the permanent magnet 20 close to the protrusion 9, and demagnetization occurs in the end face 20c of the permanent magnet 20.
- FIG. 8 is a diagram showing the flow of the reverse magnetic flux from the stator 5 in the rotor 1 of the first embodiment.
- the void 12 includes a first portion A1 having a width W1 and a second portion A2 having a width W2.
- the second portion A2 of the void 12 is the narrowest portion on the permanent magnet 20 side of the first portion A1. Further, the width W2 of the second portion A2 is wider than the width W1 of the first portion A1. In other words, the permanent magnet 20 side of the gap 12 is wider than the first portion A1 and therefore has a higher magnetoresistance than the first portion A1.
- the reverse magnetic flux from the stator 5 flows from the outer peripheral region of the rotor core 10 via the first portion A1 of the gap 12. That is, a short-circuit path of the reverse magnetic flux passing through the first portion A1 is formed.
- At least a part of the first portion A1 is located radially outside the reference line L1 extending the magnetic pole surface 20a of the permanent magnet 20. Therefore, the reverse magnetic flux flowing through the short-circuit path passing through the first portion A1 goes in the direction away from the permanent magnet 20. As a result, the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- the distance D1 from the end face 20c of the permanent magnet 20 to the first portion A1 of the gap 12 is set to the width W1 or more.
- the distance D1 is, for example, 1.5 mm.
- the protrusion 14 is provided in the gap 12 here, a configuration in which the protrusion 14 is not provided is also possible.
- the shortest distance between the end side portion 121 of the outer end side 12a of the gap 12 and the end side portion 123 of the inner end side 12b is the width W2.
- FIG. 9 is a graph showing the demagnetization characteristics of the permanent magnet 20 in comparison with the first embodiment and the first and second comparative examples.
- the horizontal axis represents the current value of the current flowing through the coil 55.
- the vertical axis shows the demagnetization rate of the permanent magnet 20.
- the demagnetization rate is represented by the reduction rate of the amount of magnetic flux interlinking with the coil 55 (amount of interlinking magnetic flux).
- amount of interlinkage magnetic flux when the rotor 1 is rotated by external power without passing a current through the coil 55 is used as a reference value, and the reduction rate of the amount of interlinkage magnetic flux with respect to the reference value is used as the demagnetization rate. Therefore, the demagnetization rate becomes a negative value.
- the permanent magnet 20 When the current value of the coil 55 is small, the permanent magnet 20 is not demagnetized, so the demagnetization rate is 0. As the current value increases, the amount of interlinkage magnetic flux to the coil 55 decreases due to the demagnetization of the permanent magnet 20.
- the demagnetization of the permanent magnet 20 leads to a decrease in the output of the motor 100, which causes a decrease in the performance of the compressor 300 or the air conditioner 400. Further, since the induced voltage generated by the interlinking of the magnetic flux to the coil 55 changes, the controllability of the motor 100 may be affected.
- the demagnetization rate of the motor 100 is required to be suppressed to 1% or less. Therefore, the inverter circuit that controls the motor 100 is provided with a current cutoff circuit or a current cutoff circuit before the demagnetization rate reaches 1%.
- the current value when the demagnetization rate is 1% is 14.7 A in Comparative Example 1 and 15.6 A in Comparative Example 2, whereas it increases to 17.0 A in the first embodiment. doing.
- a larger current can be passed without causing demagnetization of the permanent magnet 20, so that the motor efficiency can be improved.
- the residual magnetic flux density of the permanent magnet 20 can be increased.
- the magnet torque can be increased and the current value required to generate the same output can be reduced. That is, the copper loss generated in the coil 55 can be reduced and the motor efficiency can be improved.
- width W1 of the first portion A1 of the gap 12 In order to efficiently guide the reverse magnetic flux from the stator 5 to the short-circuit path passing through the first portion A1 of the gap 12, it is desirable that the width W1 of the first portion A1 is narrow. On the other hand, if the width W1 of the first portion A1 is too narrow, the magnetic flux generated from the permanent magnet 20 may be short-circuited at the first portion A1. That is, for example, the magnetic pole emitted from the magnetic pole surface 20a may return to the magnetic pole surface 20b through the first portion A1.
- FIG. 10 is a graph showing the relationship between the width W1 of the first portion A1 and the amount of interlinkage magnetic flux to the coil 55.
- the horizontal axis is a value obtained by dividing the width W1 of the first portion A1 by the thickness T of the permanent magnet 20, that is, W1 / T.
- the vertical axis shows the amount of interlinkage magnetic flux to the coil 55 when no current is flowing through the coil 55.
- W1 / T is set to 0.2 ⁇ W1 / T ⁇ 0. It is desirable that it is in the range of 5.
- the gap 12 has an outer edge 12a extending radially outward from the circumferential end of the outer edge 11a of the magnet insertion hole 11 and an outer edge. It has an inner end side 12b facing 12a. Further, in the first portion A1 of the gap 12, the outer end side 12a and the inner end side 12b (more specifically, the tip 13a of the convex portion 13) face each other with a width W1 in between, and in the second portion A2, the outer side. The end side 12a and the inner end side 12b face each other with a width W2 wider than the width W1.
- the second portion A2 is located between the first portion A1 and the permanent magnet 20. At least a part of the first portion A1 is located radially outside the reference line L1 extending the magnetic pole surface 20a of the permanent magnet 20.
- the reverse magnetic flux from the stator 5 flows through the short-circuit path through the first portion A1 of the void 12. Since at least a part of the first portion A1 is located radially outside the reference line L1, the reverse magnetic flux flowing through the short-circuit path tends away from the permanent magnet 20. As a result, the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- the third portion A3 having a width W3 wider than the width W1 is provided on the outer circumference 10a side of the first portion A1, that is, on the outer side in the radial direction, the circumference of the thin portion between the gap 12 and the outer circumference 10a is provided.
- the length in the direction can be increased. As a result, magnetic flux leakage between adjacent magnetic poles can be suppressed.
- the convex portion 13 is formed on the inner end side 12b of the gap 12, the outer peripheral region of the rotor core 10 and the convex portion 13 are not continuous. Therefore, the reverse magnetic flux from the stator 5 is less likely to flow to the permanent magnet 20 via the convex portion 13, and the effect of suppressing demagnetization of the permanent magnet 20 can be enhanced.
- the distance D1 from the end face 20c in the circumferential direction of the permanent magnet 20 to the first portion A1 is equal to or greater than the width W1 of the first portion A1 of the gap 12, magnetic saturation occurs in the short-circuit path including the first portion A1. Even in this case, it is difficult for the reverse magnetic flux to reach the permanent magnet 20. Therefore, the effect of suppressing the demagnetization of the permanent magnet 20 can be enhanced.
- width W1 of the first portion A1 of the gap 12 and the thickness T of the permanent magnet 20 satisfy 0.2 ⁇ W1 / T ⁇ 0.5, a short circuit of the magnetic flux generated from the permanent magnet 20 is suppressed. At the same time, demagnetization of the permanent magnet 20 can be suppressed.
- the protrusion 14 for positioning the permanent magnet 20 is provided in the gap 12, the movement of the permanent magnet 20 in the magnet insertion hole 11 can be restricted, and vibration and noise can be suppressed.
- FIG. 11A is a diagram showing the rotor 1A of the second embodiment.
- the circumferential length of the protrusion 15 for positioning the permanent magnet 20 is longer than the circumferential length of the protrusion 14 of the first embodiment.
- the shape of the outer edge 12a of the gap 12 is the same as that of the first embodiment.
- a protrusion 15 is formed on the inner end side 12b of the gap 12.
- the protrusion 15 has a tip 15a that faces outward in the radial direction and a side end 15b that abuts on the end face 20c of the permanent magnet 20.
- FIG. 11B is an enlarged view of a part of the rotor 1A of the second embodiment.
- the void 12 has an outer end side 12a, an inner end side 12b, and a peripheral end side 12c. Further, the outer end side 12a has end side portions 121 and 122, and the inner end side 12b has end side portions 123 and 124.
- the tip 15a of the protrusion 15 extends parallel to the end side 121 of the outer end 12a and extends to the end 124 of the inner end 12b. That is, the end edge portion 123 of the inner end edge 12b is composed of the tip end 15a of the protrusion 15. The end side portion 124 of the inner end side 12b extends radially outward from the end of the end side portion 123.
- the end side portion 124 of the inner end side 12b is formed with a convex portion 13 projecting toward the end side portion 122 of the outer end side 12a. At least a part of the tip 13a of the convex portion 13 is located radially outside the reference line L1 described above.
- the region between the end edge portion 122 of the outer end edge 12a and the tip end 13a of the convex portion 13 is defined as the first portion A1.
- the width of the first portion A1 that is, the shortest distance between the outer edge 12a of the gap 12 and the tip 13a of the convex portion 13, is the width W1.
- the region between the end edge portion 121 of the outer end edge 12a and the tip end 15a of the protrusion 15 is defined as the second portion A2.
- the width of the second portion A2 is the width W2 (> W1).
- the void 12 includes a first portion A1 having a width W1 and a second portion A2 having a width W2 wider than the width W1, and the second portion A2 is located closer to the permanent magnet 20 than the first portion A1. do. At least a part of the first portion A1 is located radially outside the reference line L1.
- the reverse magnetic flux from the stator 5 flows in the direction away from the permanent magnet 20 via the short-circuit path passing through the first portion A1.
- the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- a third portion A3 having a width W3 wider than the width W1 is provided outside the first portion A1 of the gap 12 in the radial direction. Therefore, the length of the thin-walled portion between the gap 12 and the outer peripheral portion 10a in the circumferential direction can be lengthened, and magnetic flux leakage between adjacent magnetic poles can be suppressed.
- the distance D1 from the end face 20c of the permanent magnet 20 to the first portion A1 of the gap 12 is equal to or greater than the width W1 of the first portion A1. Therefore, even when magnetic saturation occurs in the short-circuit path including the first portion A1, the reverse magnetic flux reaching the permanent magnet 20 can be reduced.
- the motor of the second embodiment is configured in the same manner as the motor 100 of the first embodiment.
- the circumferential length of the protrusion 15 is longer than that of the protrusion 14 of the first embodiment, so that the strength of the protrusion 15 is high. Therefore, in addition to the effect of the first embodiment, the reliability of the motor 100 can be improved.
- FIG. 12A is a diagram showing the rotor 1B of the third embodiment.
- the outer circumference 10a side of the gap 12 has a shape protruding toward the pole center P.
- the outer edge 12a of the void 12 of the third embodiment has a concave portion 125 extending toward the polar center P.
- the concave portion 125 is located radially outside the convex portion 13.
- the radial outer end of the concave portion 125 is on the extension line of the peripheral end side 12c, and the radial inner end of the concave portion 125 is on the extension line of the side end 13b of the convex portion 13.
- FIG. 12B is an enlarged view of a part of the rotor 1B of the third embodiment.
- the void 12 has an outer end side 12a, an inner end side 12b, and a peripheral end side 12c. Further, the outer end side 12a has end side portions 121 and 122, and the inner end side 12b has end side portions 123 and 124. A protrusion 14 for positioning the permanent magnet 20 is formed on the end side portion 123 of the inner end side 12b.
- the end side portion 124 of the inner end side 12b is formed with a convex portion 13 projecting toward the end side portion 122 of the outer end side 12a. At least a part of the tip 13a of the convex portion 13 is located radially outside the reference line L1 described above.
- the region between the end edge portion 122 of the outer end edge 12a and the tip end 13a of the convex portion 13 is defined as the first portion A1.
- the width of the first portion A1 that is, the shortest distance between the outer edge 12a of the gap 12 and the tip 13a of the convex portion 13 is the width W1.
- the region between the end edge portion 121 of the outer end edge 12a and the tip end 14a of the protrusion 14 is defined as the second portion A2.
- the width of the second portion A2 is the width W2 (> W1).
- the void 12 includes a first portion A1 having a width W1 and a second portion A2 having a width W2 wider than the width W1, and the second portion A2 is located closer to the permanent magnet 20 than the first portion A1. do. At least a part of the first portion A1 is located radially outside the reference line L1.
- the reverse magnetic flux from the stator 5 flows in the direction away from the permanent magnet 20 via the short-circuit path passing through the first portion A1.
- the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- the void 12 also has a third portion A3 having a width W3 wider than the width W1 on the outer circumference 10a side of the first portion A1.
- the width W3 is the shortest distance between the outer edge 12a and the inner edge 12b on the outer circumference 10a side of the first portion A1.
- the width W3 of the third portion A3 of the gap 12 is larger than the width W2 of the second portion A2. wide. Therefore, the length of the thin-walled portion between the gap 12 and the outer peripheral portion 10a in the circumferential direction can be lengthened, and magnetic flux leakage between adjacent magnetic poles can be suppressed.
- the area sandwiched between the two voids 12 in the rotor core 10 is the area where the magnetic flux enters and exits the permanent magnet 20.
- the circumferential width of this area is also referred to as the opening width of the magnetic pole.
- the opening width of the magnetic pole can be set to an appropriate width by adjusting the amount of protrusion of the concave portion 125 of the outer end side 12a of the gap 12 toward the pole center P side.
- the harmonic component of the magnetic flux distribution can be reduced to reduce the cogging torque, thereby reducing the noise of the motor.
- the distance D1 from the end face 20c of the permanent magnet 20 to the first portion A1 of the gap 12 is equal to or more than the width W1 of the first portion A1 as in the first embodiment. Therefore, even when magnetic saturation occurs in the short-circuit path including the first portion A1, the reverse magnetic flux reaching the permanent magnet 20 can be reduced.
- the motor of the third embodiment is configured in the same manner as the motor 100 of the first embodiment.
- the opening width of the magnetic pole can be set to an appropriate width. Therefore, in addition to the effect of the first embodiment, the noise of the motor can be reduced.
- the width W3 of the third portion A3 is wider than the width W2 of the second portion A2
- the thin portion between the third portion A3 and the outer circumference 10a can be lengthened, and the leakage flux between the adjacent magnetic poles can be increased. The effect of suppressing can be enhanced.
- FIG. 13A is a diagram showing the rotor 1C of the fourth embodiment.
- the rotor 1C of the fourth embodiment has a V-shaped magnet insertion hole 17 instead of the linear magnet insertion hole 11 of the rotor 1 of the first embodiment.
- the rotor core 10 of the rotor 1C is formed with a V-shaped magnet insertion hole 17 whose circumferential center is convex toward the inner circumference 10b.
- Two permanent magnets 20 are arranged in one magnet insertion hole 17.
- One magnet insertion hole 17 constitutes one magnetic pole.
- the circumferential center of the magnet insertion hole 17 corresponds to the polar center P.
- Each permanent magnet 20 has a magnetic pole surface 20a on the outer side in the radial direction and a magnetic pole surface 20b on the inner side in the radial direction.
- the reference line L1 is defined by the extension line of the magnetic pole surface 20a.
- the magnet insertion hole 17 has an outer end side 17a located on the outer side in the radial direction and an inner end side 17b located on the inner side in the radial direction.
- the outer edge 17a is also referred to as the outer edge of the insertion hole.
- the inner edge 17b is also referred to as the inner edge of the insertion hole.
- the outer edge 17a extends in a V shape whose center in the circumferential direction is convex toward the inner circumference 10b.
- the inner end side 17b of the magnet insertion hole 17 extends in a V shape whose circumferential center is convex toward the inner circumference 10b side.
- a protrusion 17c is formed at the center of the inner edge 17b in the circumferential direction.
- the protrusion 17c is located between the two permanent magnets 20. Air gaps 12 are formed on both sides of the magnet insertion hole 17 in the circumferential direction.
- FIG. 13B is an enlarged view of a part of the rotor 1C of the fourth embodiment.
- the void 12 has an outer end side 12a, an inner end side 12b, and a peripheral end side 12c. Further, the outer end side 12a has end side portions 121 and 122, and the inner end side 12b has end side portions 123 and 124.
- a protrusion 14 for positioning the permanent magnet 20 is formed on the end edge portion 123 of the inner end edge 12b.
- Each permanent magnet 20 is sandwiched between the protrusion 17c and the protrusion 14 and is positioned in the circumferential direction.
- the end side portion 124 of the inner end side 12b is formed with a convex portion 13 projecting toward the end side portion 122 of the outer end side 12a. At least a part of the tip 13a of the convex portion 13 is located radially outside the reference line L1.
- the region between the end edge portion 122 of the outer end edge 12a and the tip end 13a of the convex portion 13 is defined as the first portion A1.
- the width of the first portion A1 that is, the shortest distance between the outer edge 12a of the gap 12 and the tip 13a of the convex portion 13 is the width W1.
- the region between the end edge portion 121 of the outer end edge 12a and the tip end 14a of the protrusion 14 is defined as the second portion A2.
- the width of the second portion A2 is the width W2 (> W1).
- the void 12 includes a first portion A1 having a width W1 and a second portion A2 having a width W2 wider than the width W1, and the second portion A2 is located closer to the permanent magnet 20 than the first portion A1. do. At least a part of the first portion A1 is located radially outside the reference line L1.
- the reverse magnetic flux from the stator 5 flows in the direction away from the permanent magnet 20 via the short-circuit path passing through the first portion A1.
- the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- a third portion A3 having a width W3 wider than the width W1 is provided outside the first portion A1 of the gap 12 in the radial direction. Therefore, the length of the thin-walled portion between the gap 12 and the outer peripheral portion 10a in the circumferential direction can be lengthened, and magnetic flux leakage between adjacent magnetic poles can be suppressed.
- the distance D1 from the end face 20c of the permanent magnet 20 to the first portion A1 of the gap 12 is equal to or more than the width W1 of the first portion A1 as in the first embodiment. Therefore, when magnetic saturation occurs in the short-circuit path including the first portion A1, the reverse magnetic flux reaching the permanent magnet 20 can be reduced.
- the motor of the fourth embodiment is configured in the same manner as the motor 100 of the first embodiment.
- FIG. 14A is a diagram showing the rotor 1D of the fifth embodiment.
- the rotor 1D of the fifth embodiment has a convex portion 23 protruding from the end side portion 123 of the inner end side 12b of the gap 12 instead of the convex portion 13 of the first embodiment.
- FIG. 14B is an enlarged view of a part of the rotor 1D of the fifth embodiment.
- the void 12 has an outer end side 12a, an inner end side 12b, and a peripheral end side 12c. Further, the outer end side 12a has end side portions 121 and 122, and the inner end side 12b has end side portions 123 and 124. A protrusion 14 for positioning the permanent magnet 20 is formed on the end side portion 123 of the inner end side 12b.
- the convex portion 23 projects from the end side portion 123 of the inner end side 12b toward the outer end side 12a of the gap 12.
- the convex portion 23 has a tip 23a facing the outer end side 12a of the gap 12, a side end 23b facing the outer circumference 10a, and a side end 23c facing the permanent magnet 20.
- At least a part of the tip 23a is located radially outside the reference line L1 which is an extension of the magnetic pole surface 20a of the permanent magnet 20. Further, here, the side ends 23b and 23c of the convex portion 23 extend parallel to the end surface 20c of the permanent magnet 20. The side end 23b on the outer circumference 10a side is longer than the side end 23c on the permanent magnet 20 side.
- the region between the end edge portion 122 of the outer end edge 12a and the tip end 23a of the convex portion 23 is defined as the first portion A1.
- the width of the first portion A1 that is, the shortest distance between the outer edge 12a of the gap 12 and the tip 23a of the convex portion 23 is the width W1.
- the region between the end edge portion 121 of the outer end edge 12a and the tip end 14a of the protrusion 14 is defined as the second portion A2.
- the width of the second portion A2 is the width W2 (> W1).
- the void 12 includes a first portion A1 having a width W1 and a second portion A2 having a width W2 wider than the width W1, and the second portion A2 is located closer to the permanent magnet 20 than the first portion A1. do. At least a part of the first portion A1 is located radially outside the reference line L1.
- the reverse magnetic flux from the stator 5 flows in the direction away from the permanent magnet 20 via the short-circuit path passing through the first portion A1.
- the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- a third portion A3 having a width W3 wider than the width W1 is provided on the outer circumference 10a side of the first portion A1.
- the width W3 is the shortest distance between the outer edge 12a and the inner edge 12b on the outer circumference 10a side of the first portion A1.
- the distance D1 from the end face 20c of the permanent magnet 20 to the first portion A1 of the gap 12 is equal to or more than the width W1 of the first portion A1 as in the first embodiment. Therefore, even when magnetic saturation occurs in the short-circuit path including the first portion A1, the reverse magnetic flux reaching the permanent magnet 20 can be reduced.
- the motor of the fifth embodiment is configured in the same manner as the motor 100 of the first embodiment.
- the outer end side 12a of the gap 12 and the convex portion 23 form a first portion A1 having a narrow width W1, and a second portion having a width W2 wider on the permanent magnet 20 side than the first portion A1.
- A2 is formed. Therefore, a short-circuit path passing through the first portion A1 is formed. Since at least a part of the first portion A1 is located radially outside the reference line L1, the reverse magnetic flux passing through the short-circuit path is unlikely to go toward the permanent magnet 20. As a result, as in the first embodiment, the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- FIG. 15A is a diagram showing the rotor 1E of the sixth embodiment.
- the rotor 1E of the sixth embodiment has a convex portion 33 protruding from the end side portions 123 and 124 of the inner end side 12b of the gap 12 instead of the convex portion 23 of the fifth embodiment.
- FIG. 15B is an enlarged view of a part of the rotor 1E of the sixth embodiment.
- the void 12 has an outer end side 12a, an inner end side 12b, and a peripheral end side 12c. Further, the outer end side 12a has end side portions 121 and 122, and the inner end side 12b has end side portions 123 and 124. A protrusion 14 for positioning the permanent magnet 20 is formed on the end side portion 123 of the inner end side 12b.
- the convex portion 33 of the rotor 1E protrudes from the end side portions 123 and 124 of the inner end side 12b of the gap 12 toward the end side portion 122 of the outer end side 12a.
- the convex portion 33 has a tip end 33a facing the outer end side 12a, a side end 33b facing the peripheral end side 12c, and a side end 33c facing the end face 20c of the permanent magnet 20.
- At least a part of the tip 33a is located radially outside the reference line L1 described above. Further, here, the side end 33b of the convex portion 33 extends parallel to the peripheral end side 12c, and the side end 33c extends parallel to the end surface 20c of the permanent magnet 20.
- the area of the convex portion 33 on the plane orthogonal to the axis C1 is larger than the area of the convex portion 23 (FIG. 14 (B)) of the fifth embodiment.
- the region between the end edge portion 122 of the outer end edge 12a and the tip end 33a of the convex portion 33 is defined as the first portion A1.
- the width of the first portion A1 that is, the shortest distance between the outer edge 12a of the gap 12 and the tip 33a of the convex portion 33 is the width W1.
- the region between the end edge portion 121 of the outer end edge 12a and the tip end 14a of the protrusion 14 is defined as the second portion A2.
- the width of the second portion A2 is the width W2 (> W1).
- the void 12 includes a first portion A1 having a width W1 and a second portion A2 having a width W2 wider than the width W1, and the second portion A2 is located closer to the permanent magnet 20 than the first portion A1. do. At least a part of the first portion A1 is located radially outside the reference line L1.
- the reverse magnetic flux from the stator 5 flows in the direction away from the permanent magnet 20 via the short-circuit path passing through the first portion A1.
- the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- a third portion A3 having a width W3 wider than the width W1 is provided on the outer circumference 10a side of the first portion A1.
- the width W3 is the shortest distance between the outer edge 12a and the inner edge 12b on the outer circumference 10a side of the first portion A1.
- the distance D1 from the end face 20c of the permanent magnet 20 to the first portion A1 of the gap 12 is equal to or greater than the width W1 of the first portion A1. Therefore, even when magnetic saturation occurs in the short-circuit path including the first portion A1, the reverse magnetic flux reaching the permanent magnet 20 can be reduced.
- the motor of the sixth embodiment is configured in the same manner as the motor 100 of the first embodiment.
- the outer end side 12a of the gap 12 and the convex portion 33 form a first portion A1 having a narrow width W1, and a second portion having a width W2 wider on the permanent magnet 20 side than the first portion A1.
- A2 is formed. Therefore, a short-circuit path passing through the first portion A1 is formed. Since at least a part of the first portion A1 is located radially outside the reference line L1, the reverse magnetic flux flowing through the short-circuit path is unlikely to go toward the permanent magnet 20. Therefore, as in the first embodiment, the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- FIG. 16A is a diagram showing the rotor 1F of the seventh embodiment.
- the rotor 1F of the seventh embodiment has a convex portion 43 protruding from the end side portions 123 and 124 of the inner end side 12b of the gap 12 instead of the convex portion 33 of the sixth embodiment.
- FIG. 16B is an enlarged view of a part of the rotor 1F of the seventh embodiment.
- the void 12 has an outer end side 12a, an inner end side 12b, and a peripheral end side 12c. Further, the outer end side 12a has end side portions 121 and 122, and the inner end side 12b has end side portions 123 and 124.
- the end side portion 121 of the outer end side 12a extends radially outward from the end of the outer end side 11a of the magnet insertion hole 11 with respect to the outer end side 11a. ..
- the end side portion 122 of the outer end side 12a extends from the end of the end side portion 121 so as to be inclined with respect to the end side portion 121.
- the end side portions 123 and 124 of the inner end side 12b are formed with convex portions 43 protruding toward the end side portion 122 of the outer end side 12a.
- the convex portion 43 has a tip 43a facing the outer end side 12a, a side end 43b facing the peripheral end side 12c of the gap 12, and a side end 43c facing the end face 20c of the permanent magnet 20.
- the entire tip 43a of the convex portion 43 is located radially outside the reference line L1 which is an extension of the magnetic pole surface 20a of the permanent magnet 20. Further, here, the side end 43b extends parallel to the end sides 11a and 11b of the magnet insertion hole 11, and the side end 43c extends parallel to the end face 20c of the permanent magnet 20.
- the protrusion 15 formed on the inner end side 12b reaches the end side portion 124 of the inner end side 12b, similarly to the protrusion 15 (FIG. 11B) of the second embodiment.
- the protrusion 14 (FIG. 3) described in the first embodiment may be formed.
- the region between the outer edge 12a of the gap 12 and the tip 43a of the convex portion 43 is defined as the first portion A1.
- the width of the first portion A1 that is, the shortest distance between the outer edge 12a of the gap 12 and the tip 43a of the convex portion 43 is the width W1.
- the region between the end edge portion 121 of the outer end edge 12a and the tip end 15a of the protrusion 15 is defined as the second portion A2.
- the width of the second portion A2 is the width W2 (> W1).
- the void 12 includes a first portion A1 having a width W1 and a second portion A2 having a width W2 wider than the width W1, and the second portion A2 is located closer to the permanent magnet 20 than the first portion A1. do.
- the entire first portion A1 of the gap 12 is located radially outside the reference line L1.
- the reverse magnetic flux from the stator 5 flows in the direction away from the permanent magnet 20 via the short-circuit path passing through the first portion A1.
- the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- a third portion A3 having a width W3 wider than the width W1 is provided on the outer circumference 10a side of the first portion A1.
- the width W3 is the shortest distance between the outer edge 12a and the inner edge 12b on the outer circumference 10a side of the first portion A1.
- the distance D1 from the end face 20c of the permanent magnet 20 to the first portion A1 of the gap 12 is equal to or greater than the width W1 of the first portion A1. Therefore, even when magnetic saturation occurs in the short-circuit path including the first portion A1, the reverse magnetic flux reaching the permanent magnet 20 can be reduced.
- the motor of the seventh embodiment is configured in the same manner as the motor 100 of the first embodiment.
- the end side portion 121 of the outer end side 12a is inclined with respect to the outer end side 11a of the magnet insertion hole 11, but the outer end of the magnet insertion hole 11 is the same as the end side portion 121 of the first embodiment. It may be parallel to the side 11a.
- the outer end side 12a of the gap 12 and the convex portion 43 form a first portion A1 having a narrow width W1, and a second portion having a width W2 wider on the permanent magnet 20 side than the first portion A1.
- A2 is formed. Therefore, a short-circuit path passing through the first portion A1 is formed. Since the entire first portion A1 is located radially outside the reference line L1, the reverse magnetic flux flowing through the short-circuit path is more difficult to reach by the permanent magnet 20, and the effect of suppressing demagnetization of the permanent magnet 20 is suppressed. Can be enhanced.
- FIG. 17A is a diagram showing the rotor 1G of the eighth embodiment.
- the convex portion 13 is not formed on the inner end side 12b of the gap 12, and the convex portion 18 is formed on the outer end side 12a.
- FIG. 17B is an enlarged view of a part of the rotor 1G of the eighth embodiment.
- the void 12 has an outer end side 12a, an inner end side 12b, and a peripheral end side 12c. Further, the outer end side 12a has end side portions 121 and 122, and the inner end side 12b has end side portions 123 and 124.
- the convex portion 18 of the eighth embodiment extends from the end side portion 122 of the outer end side 12a toward the end side portion 124 of the inner end side 12b.
- the convex portion 18 has a tip 18a facing the inner end side 12b, a side end 18b facing the peripheral end side 12c, and a side end 18c facing the end face 20c of the permanent magnet 20. At least a part of the tip 18a is located radially outside the reference line L1 described above.
- the region between the inner end side 12b of the gap 12 and the tip 18a of the convex portion 18 is defined as the first portion A1.
- the width of the first portion A1 that is, the shortest distance between the inner end side 12b of the gap 12 and the tip 18a of the convex portion 18, is the width W1.
- the region between the end edge portion 121 of the outer end edge 12a and the tip end 14a of the protrusion 14 is defined as the second portion A2.
- the width of the second portion A2 is the width W2 (> W1).
- the void 12 includes a first portion A1 having a width W1 and a second portion A2 having a width W2 wider than the width W1, and the second portion A2 is located closer to the permanent magnet 20 than the first portion A1. do.
- the entire first portion A1 of the gap 12 is located radially outside the reference line L1.
- the reverse magnetic flux from the stator 5 flows in the direction away from the permanent magnet 20 via the short-circuit path passing through the first portion A1.
- the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- a third portion A3 having a width W3 wider than the width W1 is provided on the outer circumference 10a side of the first portion A1.
- the width W3 is the shortest distance between the outer edge 12a and the inner edge 12b on the outer circumference 10a side of the first portion A1.
- the distance D1 from the end face 20c of the permanent magnet 20 to the first portion A1 of the gap 12 is equal to or greater than the width W1 of the first portion A1. Therefore, even when magnetic saturation occurs in the short-circuit path including the first portion A1, the reverse magnetic flux reaching the permanent magnet 20 can be reduced.
- the motor of the eighth embodiment is configured in the same manner as the motor 100 of the first embodiment.
- the convex portion 18 and the inner end side 12b of the gap 12 form a first portion A1 having a narrow width W1 and a second portion having a width W2 wider on the permanent magnet 20 side than the first portion A1.
- A2 is formed. Therefore, a short-circuit path passing through the first portion A1 is formed. Since at least a part of the first portion A1 is located radially outside the reference line L1, the reverse magnetic flux flowing through the short-circuit path is unlikely to go toward the permanent magnet 20. Therefore, the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- FIG. 18A is a diagram showing the rotor 1H of the ninth embodiment.
- the end sides 19a and 19b of the magnet insertion hole 19 have a curved shape.
- the rotor core 10 of the rotor 1H is formed with an arc-shaped magnet insertion hole 19 whose circumferential center is convex toward the inner peripheral side.
- One permanent magnet 20 is arranged in one magnet insertion hole 19.
- One magnet insertion hole 19 constitutes one magnetic pole.
- the circumferential center of the magnet insertion hole 19 corresponds to the polar center P.
- the magnet insertion hole 19 has an outer end side 19a on the outer side in the radial direction and an inner end side 19b on the inner side in the radial direction.
- the outer edge 19a is also referred to as the outer edge of the insertion hole.
- the inner edge 19b is also referred to as the inner edge of the insertion hole.
- Both the end sides 19a and 19b are formed in an arc shape whose center in the circumferential direction is convex toward the inner peripheral side.
- Both the magnetic pole surfaces 20a and 20b of the permanent magnet 20 are formed in an arc shape whose circumferential center is convex toward the inner peripheral side, similarly to the magnet insertion hole 19.
- the reference line L1 is defined by an arc which is an extension of the magnetic pole surface 20a.
- the gap 12 extends from the circumferential end of the magnet insertion hole 19 toward the outer circumference 10a of the rotor core 10. As described in the first embodiment, the gap 12 has an outer end side 12a, an inner end side 12b, and a peripheral end side 12c.
- FIG. 18B is an enlarged view of a part of the rotor 1H of the ninth embodiment.
- the outer end side 12a of the gap 12 includes an end side portion 121 located on an extension line (arc) of the outer end side 19a of the magnet insertion hole 19 and an end extending from the end of the end side portion 121 toward the outer circumference 10a. It has a side portion 122 and.
- the inner end 12b of the gap 12 includes an end 123 located on an extension line (arc) of the outer end 19a of the magnet insertion hole 19 and an end extending from the end of the end 123 toward the outer circumference 10a. It has a side portion 124.
- a protrusion 14 for positioning the permanent magnet 20 is formed on the end side portion 123 of the inner end side 12b.
- the end edge portion 124 of the inner end edge 12b is formed with a convex portion 13 projecting toward the end edge portion 122 of the outer end side 12a. At least a part of the tip 13a of the convex portion 13 is located radially outside the reference line L1.
- the region between the outer edge 12a of the gap 12 and the tip 13a of the convex portion 13 is defined as the first portion A1.
- the width of the first portion A1 that is, the shortest distance between the outer edge 12a of the gap 12 and the tip 13a of the convex portion 13, is the width W1.
- the region between the end edge portion 121 of the outer end edge 12a and the tip end 14a of the protrusion 14 is defined as the second portion A2.
- the width of the second portion A2 is the width W2 (> W1).
- the void 12 has a first portion A1 having a width W1 and a second portion A2 having a width W2 wider than the width W1, and the second portion A2 is closer to the permanent magnet 20 than the first portion A1.
- At least a part of the first portion A1 of the gap 12 is located radially outside the arcuate reference line L1.
- the reverse magnetic flux from the stator 5 flows in the direction away from the permanent magnet 20 via the short-circuit path passing through the first portion A1.
- the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- a third portion A3 having a width W3 wider than the width W1 is provided on the outer circumference 10a side of the first portion A1.
- the width W3 is the shortest distance between the outer edge 12a and the inner edge 12b on the outer circumference 10a side of the first portion A1.
- the distance D1 from the end face 20c of the permanent magnet 20 to the first portion A1 of the gap 12 is equal to or more than the width W1 of the first portion A1 as in the first embodiment. Therefore, even when magnetic saturation occurs in the short-circuit path including the first portion A1, the reverse magnetic flux reaching the permanent magnet 20 can be reduced.
- the motor of the ninth embodiment is configured in the same manner as the motor 100 of the first embodiment.
- the first portion A1 having a narrow width W1 is formed between the outer end side 12a of the gap 12 and the convex portion 13.
- the second portion A2 having a width W2 is formed on the permanent magnet 20 side of the first portion A1. Therefore, a short-circuit path passing through the first portion A1 is formed. Since at least a part of the first portion A1 is located radially outside the reference line L1, the reverse magnetic flux flowing through the short-circuit path is unlikely to go toward the permanent magnet 20. Therefore, as in the first embodiment, the reverse magnetic flux reaching the permanent magnet 20 can be reduced, and the demagnetization of the permanent magnet 20 can be suppressed.
- the magnet insertion holes 11 of the second, third, fifth to eighth embodiments may be V-shaped like the magnet insertion holes 17 of the fourth embodiment, or may be V-shaped like the magnet insertion holes 19 of the ninth embodiment. It may have a curved shape.
- the protrusion 15 of the second embodiment may be provided instead of the protrusion 14.
- the concave portion 125 of the third embodiment may be provided in the gaps 12 of the second and fourth to ninth embodiments.
- the combination is not limited to these, and other combinations of the first to ninth embodiments are also possible.
- FIG. 19 is a vertical cross-sectional view showing a compressor 300 to which the motors of the first to ninth embodiments can be applied.
- the compressor 300 is a rotary compressor, and is used, for example, in an air conditioner 400 (FIG. 20).
- the compressor 300 includes a compression mechanism unit 310, a motor 100 for driving the compression mechanism unit 310, a shaft 25 for connecting the compression mechanism unit 310 and the motor 100, and a closed container 301 for accommodating these.
- the closed container 301 is a container made of a steel plate, and has a cylindrical shell and an upper part of the container that covers the upper part of the shell.
- the stator 5 of the motor 100 is incorporated inside the shell of the closed container 301 by shrink fitting, press fitting, welding, or the like.
- a discharge pipe 307 for discharging the refrigerant to the outside and a terminal 305 for supplying electric power to the motor 100 are provided on the upper part of the closed container 301. Further, an accumulator 302 for storing the refrigerant gas is attached to the outside of the closed container 301. Refrigerating machine oil that lubricates the bearing portion of the compression mechanism portion 310 is stored in the bottom portion of the closed container 301.
- the compression mechanism unit 310 includes a cylinder 311 having a cylinder chamber 312, a rolling piston 314 fixed to a shaft 25, a vane that divides the inside of the cylinder chamber 312 into a suction side and a compression side, and both ends in the axial direction of the cylinder chamber 312. It has an upper frame 316 and a lower frame 317 that close the frame.
- Both the upper frame 316 and the lower frame 317 have a bearing portion that rotatably supports the shaft 25.
- An upper discharge muffler 318 and a lower discharge muffler 319 are attached to the upper frame 316 and the lower frame 317, respectively.
- the cylinder 311 is provided with a cylindrical cylinder chamber 312 centered on the axis C1.
- An eccentric shaft portion 25a of the shaft 25 is located inside the cylinder chamber 312.
- the eccentric shaft portion 25a has a center eccentric with respect to the axis C1.
- a rolling piston 314 is fitted on the outer circumference of the eccentric shaft portion 25a.
- the cylinder 311 is formed with a suction port 313 for sucking the refrigerant gas in the cylinder chamber 312.
- a suction pipe 303 communicating with the suction port 313 is attached to the closed container 301, and refrigerant gas is supplied from the accumulator 302 to the cylinder chamber 312 via the suction pipe 303.
- a low-pressure refrigerant gas and a liquid refrigerant are mixedly supplied to the compressor 300 from the refrigerant circuit of the air conditioner 400 (FIG. 20), but when the liquid refrigerant flows into the compression mechanism unit 310 and is compressed. , It causes a failure of the compression mechanism unit 310. Therefore, the accumulator 302 separates the liquid refrigerant and the refrigerant gas, and supplies only the refrigerant gas to the compression mechanism unit 310.
- refrigerant for example, R410A, R407C, R22, etc. may be used, but from the viewpoint of preventing global warming, it is desirable to use a refrigerant having a low GWP (global warming potential).
- the low GWP refrigerant for example, the following refrigerants can be used.
- the GWP of HFO-1234yf is 4.
- a hydrocarbon having a carbon double bond in the composition for example, R1270 (propylene) may be used.
- the GWP of R1270 is 3, which is lower than HFO-1234yf but higher in flammability than HFO-1234yf.
- a mixture containing at least one of a halogenated hydrocarbon having a carbon double bond in the composition or a hydrocarbon having a carbon double bond in the composition for example, a mixture of HFO-1234yf and R32.
- the operation of the compressor 300 is as follows.
- the refrigerant gas supplied from the accumulator 302 is supplied into the cylinder chamber 312 of the cylinder 311 through the suction pipe 303.
- the shaft 25 rotates together with the rotor 1.
- the rolling piston 314 fitted to the shaft 25 rotates eccentrically in the cylinder chamber 312, and the refrigerant is compressed in the cylinder chamber 312.
- the compressed refrigerant passes through the discharge mufflers 318 and 319, and further rises in the closed container 301 through the holes 102 and 103 provided in the motor 100, and is discharged from the discharge pipe 307.
- the motor 100 described in each embodiment has high motor efficiency due to the suppression of demagnetization of the permanent magnet 20. Therefore, by using the motor 100 of any of the embodiments as the drive source of the compressor 300, the operating efficiency of the compressor 300 can be improved.
- FIG. 19 is a diagram showing the configuration of the air conditioner 400.
- the air conditioner 400 includes a compressor 401, a condenser 402, a throttle device (decompression device) 403, and an evaporator 404.
- the compressor 401, the condenser 402, the throttle device 403, and the evaporator 404 are connected by a refrigerant pipe 407 to form a refrigeration cycle. That is, the refrigerant circulates in the order of the compressor 401, the condenser 402, the drawing device 403, and the evaporator 404.
- the compressor 401, the condenser 402, and the drawing device 403 are provided in the outdoor unit 410.
- the compressor 401 is composed of the compressor 300 shown in FIG.
- the outdoor unit 410 is provided with an outdoor blower 405 that supplies outdoor air to the condenser 402.
- the evaporator 404 is provided in the indoor unit 420.
- the indoor unit 420 is provided with an indoor blower 406 that supplies indoor air to the evaporator 404.
- the operation of the air conditioner 400 is as follows.
- the compressor 401 compresses and sends out the sucked refrigerant.
- the condenser 402 exchanges heat between the refrigerant flowing in from the compressor 401 and the outdoor air, condenses the refrigerant, liquefies it, and sends it out to the refrigerant pipe 407.
- the outdoor blower 405 supplies outdoor air to the condenser 402.
- the throttle device 403 adjusts the pressure of the refrigerant flowing through the refrigerant pipe 407 by changing the opening degree.
- the evaporator 404 exchanges heat between the refrigerant reduced to a low pressure by the throttle device 403 and the air in the room, causes the refrigerant to take away the heat of the air, evaporate (vaporize) it, and send it to the refrigerant pipe 407.
- the indoor blower 406 supplies indoor air to the evaporator 404. As a result, the cold air whose heat has been taken away by the evaporator 404 is supplied to the room.
- the air conditioner 400 has a compressor 401 whose operating efficiency is improved by applying the motor 100 described in each embodiment. Therefore, the operating efficiency of the air conditioner 400 can be improved.
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Abstract
Description
<モータの構成>
まず、実施の形態1のモータ100について説明する。図1は、実施の形態1のモータ100を示す横断面図である。モータ100は、ロータ1に永久磁石20が埋め込まれた永久磁石埋込型モータであり、例えば圧縮機300(図19)に用いられる。
ステータ5は、ステータコア50と、ステータコア50に取り付けられた絶縁部54と、絶縁部54を介してステータコア50に巻き付けられたコイル55とを有する。
ロータ1は、円筒状のロータコア10と、ロータコア10に取り付けられた永久磁石20と、ロータコア10の中央部に固定されたシャフト25とを有する。シャフト25の中心軸線は、上述した軸線C1である。ロータコア10は、外周10aと内周10bとを有する。外周10aおよび内周10bはいずれも、軸線C1を中心とする環状である。
ここで、実施の形態1と対比する比較例1,2について説明する。図4は、比較例1のロータ1Iを示す図である。比較例1のロータ1Iは、空隙12に凸部13(図2,3)が設けられていない点で、実施の形態1のロータ1と相違する。他の点では、比較例1のロータ1Iは、実施の形態1のロータ1と同様に構成されている。
図9は、永久磁石20の減磁特性を、実施の形態1と比較例1,2とで比較して示すグラフである。横軸は、コイル55に流す電流の電流値を示す。縦軸は、永久磁石20の減磁率を示す。
空隙12の第1部分A1を通る短絡経路にステータ5からの逆磁束を効率よく導くためには、第1部分A1の幅W1は狭い方が望ましい。一方、第1部分A1の幅W1が狭すぎると、永久磁石20から出た磁束が第1部分A1で短絡する可能性がある。すなわち、例えば磁極面20aから出た磁極が、第1部分A1を通って磁極面20bに戻ってしまう可能性がある。
以上説明したように、実施の形態1のロータ1は、空隙12が、磁石挿入孔11の外側端辺11aの周方向端部から径方向外側に延在する外側端辺12aと、外側端辺12aに対向する内側端辺12bとを有する。また、空隙12の第1部分A1では、外側端辺12aと内側端辺12b(より具体的には凸部13の先端13a)とが幅W1を隔てて対向し、第2部分A2では、外側端辺12aと内側端辺12bとが幅W1よりも広い幅W2を隔てて対向する。第2部分A2は、第1部分A1と永久磁石20との間に位置する。第1部分A1の少なくとも一部は、永久磁石20の磁極面20aを延長した基準線L1に対して径方向外側に位置する。
図11(A)は、実施の形態2のロータ1Aを示す図である。実施の形態2のロータ1Aでは、永久磁石20を位置決めする突起15の周方向長さが、実施の形態1の突起14の周方向長さよりも長い。
図12(A)は、実施の形態3のロータ1Bを示す図である。実施の形態3のロータ1Bでは、空隙12の外周10a側が極中心Pに向かって突出した形状を有している。
図13(A)は、実施の形態4のロータ1Cを示す図である。実施の形態4のロータ1Cは、実施の形態1のロータ1の直線状の磁石挿入孔11の代わりに、V字形状の磁石挿入孔17を有する。
図14(A)は、実施の形態5のロータ1Dを示す図である。実施の形態5のロータ1Dは、実施の形態1の凸部13の代わりに、空隙12の内側端辺12bの端辺部123から突出する凸部23を有する。
図15(A)は、実施の形態6のロータ1Eを示す図である。実施の形態6のロータ1Eは、実施の形態5の凸部23の代わりに、空隙12の内側端辺12bの端辺部123,124から突出する凸部33を有する。
図16(A)は、実施の形態7のロータ1Fを示す図である。実施の形態7のロータ1Fは、実施の形態6の凸部33の代わりに、空隙12の内側端辺12bの端辺部123,124から突出する凸部43を有する。
図17(A)は、実施の形態8のロータ1Gを示す図である。実施の形態8のロータ1Gでは、空隙12の内側端辺12bに凸部13が形成されておらず、外側端辺12aに凸部18が形成されている。
図18(A)は、実施の形態9のロータ1Hを示す図である。実施の形態9のロータ1Hでは、磁石挿入孔19の端辺19a,19bが湾曲した形状を有する。
次に、実施の形態1~9のモータが適用可能な圧縮機300について説明する。図19は、実施の形態1~9のモータが適用可能な圧縮機300を示す縦断面図である。圧縮機300は、ロータリ圧縮機であり、例えば空気調和装置400(図20)に用いられる。
(2)また、組成中に炭素の二重結合を有する炭化水素、例えばR1270(プロピレン)を用いてもよい。R1270のGWPは3であり、HFO-1234yfより低いが、可燃性はHFO-1234yfより高い。
(3)また、組成中に炭素の二重結合を有するハロゲン化炭化水素または組成中に炭素の二重結合を有する炭化水素の少なくとも何れかを含む混合物、例えばHFO-1234yfとR32との混合物を用いてもよい。上述したHFO-1234yfは低圧冷媒のため圧損が大きくなる傾向があり、冷凍サイクル(特に蒸発器)の性能低下を招く可能性がある。そのため、HFO-1234yfよりも高圧冷媒であるR32またはR41との混合物を用いることが実用上は望ましい。
次に、図19の圧縮機300を備えた冷凍サイクル装置としての空気調和装置400について説明する。図19は、空気調和装置400の構成を示す図である。空気調和装置400は、圧縮機401と、凝縮器402と、絞り装置(減圧装置)403と、蒸発器404とを備える。
Claims (18)
- 軸線を中心とする周方向に延在する外周と、前記軸線を中心とする径方向において前記外周よりも内側に位置する磁石挿入孔と、前記磁石挿入孔の前記周方向の端部につながる空隙とを有するロータコアと、
前記磁石挿入孔に配置され、前記径方向の外側に磁極面を有する永久磁石と
を有し、
前記磁石挿入孔は、前記径方向の外側に位置する挿入孔外側端辺と、前記径方向の内側に位置する挿入孔内側端辺とを有し、
前記空隙は、前記挿入孔外側端辺の前記周方向の端部から前記外周に向けて延在する外側端辺と、前記外側端辺に対向する内側端辺とを有し、
前記空隙は、前記外側端辺と前記内側端辺とが幅W1を隔てて対向する第1部分と、前記外側端辺と前記内側端辺とが前記幅W1よりも広い幅W2を隔てて対向する第2部分とを有し、
前記第2部分は、前記第1部分と前記永久磁石との間に位置し、
前記第1部分の少なくとも一部が、前記軸線に直交する面内で前記磁極面を延長した基準線に対して、前記径方向の外側に位置している
ロータ。 - 前記空隙は、前記第1部分よりも前記径方向の外側に、前記外側端辺と前記内側端辺とが前記幅W1よりも広い幅W3を隔てて対向する第3部分を有する
請求項1に記載のロータ。 - 前記第3部分の前記外側端辺には、前記内側端辺から離れる方向に凹形状部が形成され、
前記第3部分における前記幅W3は、前記第2部分における前記幅W2よりも広い
請求項2に記載のロータ。 - 前記空隙に、前記永久磁石を位置決めするための突起が形成され、
前記空隙の前記外側端辺と前記突起とが、前記幅W2を隔てて対向する
請求項1から3までの何れか1項に記載のロータ。 - 前記突起は、前記内側端辺まで延在している
請求項4に記載のロータ。 - 前記第1部分の前記幅W1は、前記永久磁石の前記径方向の厚さTよりも狭い
請求項1から5までの何れか1項に記載のロータ。 - 前記第1部分の前記幅W1と、前記永久磁石の前記厚さTとは、
0.2≦W1/T≦0.5を満足する
請求項6に記載のロータ。 - 前記永久磁石の前記周方向の端部から前記第1部分までの距離は、前記幅W1以上である
請求項1から7までの何れか1項に記載のロータ。 - 前記空隙の前記内側端辺に、前記外側端辺に向けて突出する凸部が形成され、
前記外側端辺と前記凸部とにより、前記第1部分が形成される
請求項1から8までの何れか1項に記載のロータ。 - 前記空隙の前記外側端辺に、前記内側端辺に向けて突出する凸部が形成され、
前記空隙の前記内側端辺と前記凸部とにより、前記第1部分が形成される
請求項1から8までの何れか1項に記載のロータ。 - 前記空隙の前記内側端辺は、前記挿入孔内側端辺の延長線上に位置する第1端辺部と、前記第1端辺部に対して傾斜し、前記外周に向けて延在する第2端辺部とを有し、
前記内側端辺の前記第1端辺部に、前記空隙の前記外側端辺に向けて突出する凸部が形成されている
請求項1から8までの何れか1項に記載のロータ。 - 前記空隙の前記内側端辺は、前記挿入孔内側端辺の延長線上に位置する第1端辺部と、前記第1端辺部に対して傾斜し、前記外周に向けて延在する第2端辺部とを有し、
前記内側端辺の前記第1端辺部および前記第2端辺部に、前記空隙の前記外側端辺に向けて突出する凸部が形成されている
請求項1から8までの何れか1項に記載のロータ。 - 前記第1部分の全体が、前記基準線に対して前記径方向の外側に位置している
請求項1から12までの何れか1項に記載のロータ。 - 前記磁石挿入孔の前記磁極面は、前記軸線の方向に直交する面内において、前記径方向の内側に凸となるV字形状を有する
請求項1から13までの何れか1項に記載のロータ。 - 前記磁石挿入孔の前記磁極面は、前記軸線の方向に直交する面内において、湾曲形状を有する
請求項1から14までの何れか1項に記載のロータ。 - 請求項1から15までの何れか1項に記載のロータと、
前記ロータを前記径方向の外側から囲むステータと
を有するモータ。 - 請求項16に記載のモータと、
前記モータによって駆動される圧縮機構部と
を備えた圧縮機。 - 請求項17に記載の圧縮機と、
前記圧縮機から送り出された冷媒を凝縮する凝縮器と、
前記凝縮器により凝縮した冷媒を減圧する減圧装置と、
前記減圧装置で減圧された冷媒を蒸発させる蒸発器と
を備えた空気調和装置。
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JP2022516481A JP7433420B2 (ja) | 2020-04-20 | 2020-04-20 | ロータ、モータ、圧縮機および空気調和装置 |
CN202080099259.XA CN115398779A (zh) | 2020-04-20 | 2020-04-20 | 转子、电机、压缩机及空气调节装置 |
PCT/JP2020/017037 WO2021214825A1 (ja) | 2020-04-20 | 2020-04-20 | ロータ、モータ、圧縮機および空気調和装置 |
EP20932353.4A EP4142112A4 (en) | 2020-04-20 | 2020-04-20 | ROTOR, MOTOR, COMPRESSOR, AND AIR CONDITIONER |
AU2020444066A AU2020444066B2 (en) | 2020-04-20 | 2020-04-20 | Rotor, motor, compressor, and air conditioner |
US17/910,167 US20230091530A1 (en) | 2020-04-20 | 2020-04-20 | Rotor, motor, compressor, and air conditioner |
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- 2020-04-20 CN CN202080099259.XA patent/CN115398779A/zh active Pending
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Also Published As
Publication number | Publication date |
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AU2020444066B2 (en) | 2024-02-22 |
JPWO2021214825A1 (ja) | 2021-10-28 |
EP4142112A4 (en) | 2023-06-21 |
CN115398779A (zh) | 2022-11-25 |
EP4142112A1 (en) | 2023-03-01 |
AU2020444066A1 (en) | 2022-11-17 |
US20230091530A1 (en) | 2023-03-23 |
JP7433420B2 (ja) | 2024-02-19 |
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