JP2010158085A - Rotor of permanent-magnet motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor of a permanent-magnet motor wherein, even when a rotor core plate (magnetic steel sheet) which is relatively large in diameter is press-worked, warpage in the rotor core plate can be prevented. <P>SOLUTION: The rotor of the permanent-magnet motor includes a rotor core 20 formed by laminating multiple pieces of a magnetic steel sheet punched out in a predetermined shape; multiple magnet insertion holes 22, formed along the outer circumferential portion of the rotor core 20; two leakage flux suppression holes 23a, 23b positioned at both ends of each magnet insertion hole 22 in the circumferential direction; a permanent magnet 21, inserted between the two leakage flux suppression holes 23a, 23b inside each magnet insertion hole 22; and two outer circumferential thinned portions 25a, 25b, formed between the outer circumferential portion of the rotor core 20 and each two leakage flux suppressing holes 23a, 23b. The radial dimension of one of each two outer circumferential thinned portions 25a, 25b is set to exceed twice the radial dimension of the other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotor of a permanent magnet type motor used for a compressor, a fan motor or the like.

2. Description of the Related Art Conventionally, a stator core and a rotor core (magnet embedded field core) disposed in the stator core are included, and one permanent magnet per pole in the rotor core according to the number of poles in the circumferential direction of the rotor core In permanent magnet type motors embedded at equal intervals, each permanent magnet has a bathtub-shaped vertical cross section perpendicular to the axis of the rotor core, and flux for preventing magnetic flux leakage and short-circuit magnetic flux at both ends of each permanent magnet There has been proposed a permanent magnet type motor in which reluctance torque and magnet torque are improved by providing a barrier (see, for example, Patent Document 1).
JP 2000-228836 A

  However, since the permanent magnet type motor described in Patent Document 1 is provided with axially symmetrical flux barriers at both ends of the magnet, the rotor constituting a relatively large diameter rotor (for example, a diameter of about 100 mm). When an iron core plate (magnetic steel plate) is pressed, there is a problem that the rotor core plate is warped.

  The present invention has been made to solve the above-described problems, and even when a rotor core plate (electromagnetic steel plate) having a relatively large diameter is pressed, a permanent magnet that can prevent the rotor core plate from warping. An object of the present invention is to provide a rotor for a mold motor.

The rotor of the permanent magnet type motor according to the present invention comprises a rotor core configured by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape,
A plurality of magnet insertion holes formed along the outer periphery of the rotor core;
Two leakage flux suppression holes located at both circumferential ends of the magnet insertion hole;
A permanent magnet inserted between two leakage flux suppression holes in the magnet insertion hole;
Two outer peripheral thin portions formed between the outer periphery of the rotor core and the two leakage flux suppression holes,
One of the two outer peripheral thin portions has a radial dimension that is at least twice as large as the other radial dimension.

  In the rotor of the permanent magnet type motor according to the present invention, a rotor core having a relatively large diameter is obtained by setting one of the two outer thin portions to a radial dimension that is twice or more the other radial dimension. Even when a plate (electromagnetic steel plate) is pressed, the warp of the rotor core plate can be prevented.

Embodiment 1 FIG.
1 to 22 are diagrams showing the first embodiment. FIG. 1 is a cross-sectional view of the permanent magnet type motor 100, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 4 is an enlarged view of a portion B in FIG. 3, FIG. 5 is a diagram in which the permanent magnet 21 is omitted from FIG. 4, FIG. 6 is a diagram corresponding to FIG. 8 is a cross-sectional view of the rotor 200 of the second modification, FIG. 9 is an enlarged view of a portion C of FIG. 8, FIG. 10 is a diagram in which the permanent magnet 21 is omitted from FIG. FIG. 12 is a diagram in which the permanent magnet 21 is omitted from FIG. 11, FIG. 13 is a cross-sectional view of the rotor 200 according to the modified example 4, FIG. 14 is an enlarged view of a portion D in FIG. FIG. 16 is a view corresponding to FIG. 11 of the modified example 5, FIG. 17 is a view omitting the permanent magnet 21 from FIG. 16, and FIG. 18 is a transverse sectional view of the rotor 200 of the modified example 6. 19 is an enlarged view of a portion E in FIG. 18, FIG. 20 is a diagram in which the permanent magnet 21 is omitted from FIG. 19, FIG. 21 is a diagram corresponding to FIG. is there.

  This embodiment is characterized by a rotor of a permanent magnet type motor. The rotor of the permanent magnet motor is a magnet-embedded rotor in which a permanent magnet is embedded in a magnet insertion hole.

  Magnet insertion holes formed along the outer peripheral edge of the rotor core are usually provided with leakage flux suppression holes that suppress leakage flux of the permanent magnets at both ends in the circumferential direction.

  The radial dimension of the thin portion of the outer periphery of the rotor core between the leakage magnetic flux suppression hole and the outer periphery of the rotor core is usually about the thickness of the rotor core plate (electromagnetic steel plate) constituting the rotor core. .

  In such a configuration, in a rotor having a relatively large diameter (for example, about 100 mm in diameter), the strength of the rotor core outer peripheral thin portion between the leakage magnetic flux suppression hole and the outer periphery of the rotor core is insufficient. When the rotor core plate is pressed, there is a problem that the rotor core plate is warped.

  Therefore, in the present embodiment, the radial dimension of one of the rotor core outer circumferential thin portions between the leakage magnetic flux suppression holes at both ends of the magnet insertion hole and the outer circumference of the rotor core is set to be larger than the other radial dimension. By increasing the size, the warp of the rotor core plate when the rotor core plate is pressed is suppressed.

  First, the configuration of the permanent magnet motor 100 will be described with reference to FIGS. A permanent magnet motor 100 shown in FIG. 1 includes a stator 300 and a rotor 200.

  The stator 300 includes a substantially cylindrical stator core 10 and a winding 12.

  The stator core 10 is configured by laminating a predetermined number of stator core plates obtained by punching electromagnetic steel plates having a thickness of about 0.2 to 0.5 mm into a predetermined shape by a predetermined method (welding, caulking, etc.). The

  In the stator core 10, 36 slots 11 are arranged at substantially equal intervals along the inner periphery. A ring-shaped iron core portion on the outer peripheral side of the slot 11 is referred to as a core back 16. The iron core portion between the slots 11 is referred to as a tooth 17.

  A slot cell 13, which is an insulating member, is inserted into the slot 11, and the winding 12 is accommodated in the slot 11 from the slot opening 11 a. For the slot cell 13, an insulating film made of a material such as PET (polyethylene terephthalate) is usually used.

  Although not shown, the winding 12 is a distributed winding type three-phase winding. However, the winding method is not limited to distributed winding.

  After the winding 12 is housed in the slot 11, the wedge 14 is inserted in the vicinity of the slot opening 11 a in each slot 11 so that the winding 12 does not leak out of the slot 11.

  A gap 15 having a predetermined radial dimension g is provided between the stator 300 and the rotor 200.

  The rotor 200 is disposed inside the stator 300 via the gap 15.

  Hereinafter, the configuration of the rotor 200 will be described with reference to FIGS. 1 and 3 to 5.

  The rotor 200 includes a rotor core 20 and six permanent magnets 21.

  The rotor core 20 is also configured by laminating a predetermined number of rotor core plates obtained by punching electromagnetic steel plates having a thickness of about 0.2 to 0.5 mm into a predetermined shape by a predetermined method (welding, caulking, etc.). .

  The stator core plate and the rotor core plate may be pressed at the same time, or may be pressed separately.

  In the rotor core 20, six magnet insertion holes 22 for inserting the permanent magnets 21 along the outer periphery are formed at substantially equal intervals in the circumferential direction.

  There are portions (spaces) where the permanent magnet 21 does not exist at both ends of the magnet insertion hole 22, which are referred to as leakage flux suppressing holes 23 a and 23 b.

  Leakage magnetic flux suppression holes 23 a and 23 b are provided to suppress leakage magnetic flux at the circumferential end of permanent magnet 21.

  The core portion between the leakage flux suppressing hole 23a and the outer peripheral portion of the rotor core 20 is defined as an outer peripheral thin portion 25a. Let La be the radial dimension of the outer peripheral thin portion 25a.

  The core portion between the leakage flux suppressing hole 23b and the outer peripheral portion of the rotor core 20 is defined as an outer peripheral thin portion 25b. The radial dimension of the outer peripheral thin portion 25b is Lb.

  A shaft hole 24 into which the shaft is fitted is formed at a substantially central portion of the rotor core 20.

  The arrows shown in FIGS. 1 and 3 indicate the rotation direction of the rotor 200. Leakage magnetic flux suppression hole 23 a is located in the counter-rotating direction with respect to magnet insertion hole 22. Further, the leakage flux suppressing hole 23 b is located in the rotational direction with respect to the magnet insertion hole 22.

And the radial direction dimension of the outer periphery thin part 25a and the radial direction dimension of the outer periphery thin part 25b satisfy | fill the relationship of (1) Formula.
Lb ≧ 2La (1)

  Generally, the radial dimension of the outer peripheral thin wall portion 25a of the iron core portion between the leakage flux suppressing hole 23a and the outer peripheral portion of the rotor core 20 is about the thickness of the electromagnetic steel sheet constituting the rotor core 20. is there. The thickness of the electromagnetic steel sheet is 0.2 to 0.5 mm.

  In the present embodiment, the radial dimension Lb of the outer peripheral thin wall portion 25b of the iron core portion between the leakage flux suppressing hole 23b and the outer peripheral portion of the rotor core 20 is set as the outer peripheral portion of the leakage flux suppressing hole 23a and the rotor core 20. The strength of the outer peripheral thin portion 25b is increased by setting the iron core portion between the outer peripheral thin portion 25a to be twice or more the radial dimension La of the peripheral thin portion 25a.

  By increasing the strength of the outer peripheral thin portion 25b, it is possible to suppress warping of the rotor core plate when the rotor core plate is pressed. In this case, since the radial dimension La of the outer peripheral thin portion 25a is about the thickness of a normal electromagnetic steel plate, the leakage magnetic flux of the permanent magnet 21 slightly increases as compared with when Lb = La, but the permanent magnet motor 100 There is little fear of adversely affecting the characteristics of

  Further, the core portion between the leakage flux suppressing hole 23b and the outer peripheral portion of the rotor core 20 has a radial dimension Lb of the outer peripheral thin portion 25b, and between the leakage flux suppressing hole 23a and the outer peripheral portion of the rotor core 20. When the iron core portion is at least twice the radial dimension La of the outer peripheral thin part 25a, the radial dimension La of the opposite outer thin part 25a is more than twice the radial dimension Lb of the outer thin part 25b. In addition, the characteristics of the permanent magnet motor 100 are improved.

  However, the core portion between the leakage flux suppressing hole 23a and the outer peripheral portion of the rotor core 20 is the same as the radial dimension La of the outer thin portion 25a, and between the leakage flux suppressing hole 23b and the outer peripheral portion of the rotor core 20. The present embodiment also includes a mode in which the iron core portion is at least twice the radial dimension Lb of the outer peripheral thin portion 25b.

  The rotor 200 of the modification 1 is demonstrated with FIG. 6, FIG. The rotor 200 of the first modification is similar to the rotor 200 shown in FIGS. 1 to 5 in that the core portion between the leakage flux suppressing hole 23b and the outer periphery of the rotor core 20 is the radial dimension of the outer thin portion 25b. Lb is set so that the iron core portion between the leakage flux suppressing hole 23a and the outer peripheral portion of the rotor core 20 is twice or more the radial dimension La of the outer thin portion 25a.

  In addition, it is also preferable that the leakage flux suppressing hole 23a is positioned in the counter-rotating direction with respect to the magnet insertion hole 22 and the leakage flux suppressing hole 23b is positioned in the rotating direction with respect to the magnet insertion hole 22. This is the same as the rotor 200 shown in FIG. However, like the rotor 200 shown in FIGS. 1 to 5, the opposite leakage flux suppression hole 23 a is positioned in the rotational direction with respect to the magnet insertion hole 22, and the leakage flux suppression hole 23 b is relative to the magnet insertion hole 22. A form located in the counter-rotating direction is also included.

  As shown in FIGS. 6 and 7, the iron core portion between the leakage flux suppressing hole 23 a and the outer peripheral portion of the rotor core 20 is θa, and the circumferential angle of the outer thin portion 25 a is θa, and the leakage flux suppressing hole 23 b and the rotor are. An angle in the circumferential direction of the thin outer peripheral portion 25b is defined as θb at the core portion between the outer peripheral portion of the iron core 20 and θb.

  The circumferential angle θa refers to an angle formed by two straight lines connecting the center of the rotor core 20 and both ends in the circumferential direction of the outer thin portion 25a.

  Similarly, the circumferential angle θb refers to an angle formed by two straight lines connecting the center of the rotor core 20 and both ends in the circumferential direction of the thin outer peripheral portion 25b.

  In the rotor 200 of the first modification, the circumferential angle θb of the outer thin portion 25b is set to be twice or more the circumferential angle θa of the outer thin portion 25a. Therefore, the circumferential length of the outer peripheral thin portion 25b is twice or more longer than the circumferential length of the outer peripheral thin portion 25b of the rotor 200 shown in FIGS.

  Therefore, the magnetic resistance of the outer peripheral thin portion 25b of the rotor 200 of the first modification is larger than the magnetic resistance of the outer peripheral thin portion 25b of the rotor 200 shown in FIGS. 1 to 5, and the radial dimension of the outer peripheral thin portion 25b. Even if Lb is set to be twice or more the radial dimension La of the outer peripheral thin portion 25a, leakage of magnetic flux at the circumferential end of the permanent magnet 21 can be further suppressed.

  A rotor 200 according to the second modification will be described with reference to FIGS. The rotor 200 of Modification 2 is characterized in that the magnet insertion hole 26 has a bathtub shape.

  As shown in FIG. 10, in the magnet insertion hole 26, leakage magnetic flux suppression holes 26 a and 26 b at both ends of the permanent magnet insertion portion 26 c extending in the circumferential direction are bent toward the outer peripheral side of the rotor core 20.

  If the magnet insertion hole 26 has a bathtub shape in which leakage magnetic flux suppression holes 26 a and 26 b at both ends are bent toward the outer peripheral side of the rotor core 20, the permanent magnet 21 moves to the center side of the rotor core 20. .

  The “magnet embedding depth” shown in FIG. 9 is deeper than the long hole-shaped magnet insertion hole 22 shown in FIGS.

  The magnet embedding depth is closely related to the torque characteristics of the permanent magnet type motor 100. When the torque characteristics are obtained by changing the magnet embedding depth by magnetic field analysis, the torque becomes maximum at a certain magnet embedding depth.

  When the magnet embedding depth becomes shallower than the magnet embedding depth at which the torque is maximized, the torque decreases.

  Further, when the magnet embedding depth becomes deeper than the magnet embedding depth at which the torque is maximized, the torque gradually decreases.

  Therefore, it is preferable to set the magnet embedding depth to a magnet embedding depth that maximizes the torque.

  Furthermore, as the magnet embedding depth increases, the area of the iron core portion outside the magnet insertion hole 26 increases. Therefore, there is an advantage that the stator magnetic flux generated by the current flowing through the winding 12 of the stator 300 easily passes through the iron core portion outside the magnet insertion hole 26 and the reluctance torque is increased.

  The arrows shown in FIGS. 8 to 10 indicate the rotation direction of the rotor 200. Leakage magnetic flux suppression hole 26 a is located in the counter-rotating direction with respect to magnet insertion hole 22. Further, the leakage flux suppressing hole 26 b is positioned in the rotational direction with respect to the magnet insertion hole 22.

  Also in the rotor 200 of the second modification shown in FIGS. 8 to 10, the radial dimension Lb of the outer peripheral thin portion 27b is set as the leakage magnetic flux in the iron core portion between the leakage flux suppressing hole 26b and the outer periphery of the rotor iron core 20. By setting the iron core portion between the suppression hole 26a and the outer peripheral portion of the rotor core 20 to be twice or more the radial dimension La of the outer thin portion 27a, the strength of the outer thin portion 27b can be increased.

  The core portion between the leakage flux suppression hole 26b and the outer periphery of the rotor core 20 is the radial dimension Lb of the outer peripheral thin portion 27b, and the core portion between the leakage flux suppression hole 26a and the outer periphery of the rotor core 20 is the same. Is more than twice the radial dimension La of the outer peripheral thin part 27a, rather than the radial dimension La of the opposite outer peripheral thin part 27a is more than twice the radial dimension Lb of the outer peripheral thin part 27b. The characteristics of the permanent magnet motor 100 are the same.

  However, the core portion between the leakage flux suppressing hole 23a and the outer peripheral portion of the rotor core 20 is the same as the radial dimension La of the outer thin portion 25a, and between the leakage flux suppressing hole 23b and the outer peripheral portion of the rotor core 20. The present embodiment also includes a mode in which the iron core portion is at least twice the radial dimension Lb of the outer peripheral thin portion 25b.

  A rotor 200 according to Modification 3 will be described with reference to FIGS. 11 and 12. The rotor 200 of the third modification is similar to the rotor 200 of the second modification shown in FIGS. 8 to 10 in that the iron core portion between the leakage flux suppressing hole 26b and the outer periphery of the rotor core 20 is the outer thin portion 27b. The core dimension between the leakage flux suppressing hole 26a and the outer periphery of the rotor core 20 is set to be twice or more the radial dimension La of the outer peripheral thin portion 27a.

  In addition, it is preferable that the leakage flux suppressing hole 26a is positioned in the counter-rotating direction with respect to the magnet insertion hole 22 and the leakage flux suppressing hole 26b is positioned in the rotating direction with respect to the magnet insertion hole 22. This is the same as the rotor 200 of the second modification shown in FIG. However, similarly to the rotor 200 of Modification 2 shown in FIGS. 8 to 10, the opposite leakage flux suppression hole 23a is positioned in the rotational direction with respect to the magnet insertion hole 22, and the leakage flux suppression hole 23b is the magnet insertion hole. It is also assumed that a configuration located in the counter-rotating direction with respect to 22 is included.

  As shown in FIGS. 11 and 12, the core portion between the leakage flux suppressing hole 26a and the outer peripheral portion of the rotor core 20 is the circumferential angle of the outer peripheral thin portion 27a, θa, and the leakage flux suppressing hole 26b and the rotor. An angle in the circumferential direction of the outer peripheral thin portion 27b is defined as θb at the core portion between the outer periphery of the iron core 20 and θb.

  The circumferential angle θa refers to an angle formed by two straight lines connecting the center of the rotor core 20 and both ends in the circumferential direction of the outer peripheral thin portion 27a.

  Similarly, the circumferential angle θb refers to an angle formed by two straight lines connecting the center of the rotor core 20 and both circumferential ends of the outer peripheral thin portion 27b.

  In the rotor 200 of the third modification, the circumferential angle θb of the outer peripheral thin portion 27b is set to be twice or more the circumferential angle θa of the outer peripheral thin portion 27a. Therefore, the circumferential length of the outer peripheral thin portion 27b is at least twice as long as the circumferential length of the outer peripheral thin portion 27b of the rotor 200 of Modification 2 shown in FIGS.

  Therefore, the magnetic resistance of the outer thin portion 27b of the rotor 200 of the third modification is larger than the magnetic resistance of the outer thin portion 25b of the rotor 200 of the second modification shown in FIGS. 8 to 10, and the outer thin portion 27b. Even if the radial dimension Lb is set to be twice or more the radial dimension La of the outer peripheral thin portion 27a, the leakage of magnetic flux at the circumferential end of the permanent magnet 21 can be further suppressed.

  A rotor 200 according to Modification 4 will be described with reference to FIGS. The rotor 200 of the fourth modification is similar to the rotor 200 of the second modification shown in FIGS. 8 to 10 in the shape of a long hole in the vicinity of the leakage flux suppressing holes 26a and 26b at the iron core portion outside the magnet insertion hole 26. A slit 28 is added.

  As shown in FIGS. 13 to 15, the rotor 200 of the fourth modification is the same as the rotor 200 of the second modification shown in FIGS. 8 to 10 except for the slit 28.

  In the example shown in FIG. 13 to FIG. 15, two long-hole shaped slits 28 are provided in the vicinity of the leakage flux suppressing holes 26 a and 26 b in the iron core portion outside the magnet insertion hole 26.

  The direction of the slit 28 is roughly the radial direction. Precisely, as shown in FIGS. 14 and 15, the slit 28 is inclined at a predetermined angle toward the pole center.

  Since the slit 28 is inclined at a predetermined angle toward the pole center, the iron core portion between the slits 28 is also inclined at a predetermined angle toward the pole center, so that the magnetic flux from the permanent magnet 21 toward the stator 300 is concentrated at the pole center. The characteristics of the mold motor 100 are improved.

  The core portion between the slit 28 and the outer peripheral portion of the rotor core 20, the magnet insertion hole 26 and the leakage magnetic flux suppression holes 26a and 26b has a size about the thickness of the electromagnetic steel plate as in the outer thin portions 27a and 27b. , Slightly smaller than that.

  Permanent magnets than the rotor 200 of the second modification shown in FIGS. 8 to 10 are provided in the iron core portion outside the magnet insertion hole 26 in the vicinity of the leakage flux suppressing holes 26a and 26b by providing a slot 28 having a long hole shape. It is possible to further suppress the leakage of magnetic flux at both ends of 21.

  A rotor 200 according to Modification 5 will be described with reference to FIGS. 16 and 17. The rotor 200 of Modification 5 is obtained by adding the slit 28 of the rotor 200 of Modification 4 of FIGS. 13 to 15 to the rotor 200 of Modification 3 of FIGS. 11 and 12.

  11 and 12 is provided at both ends of the rotor 200 permanent magnet 21 in the iron core portion outside the magnet insertion hole 26 in the vicinity of the leakage flux suppressing holes 26a and 26b. The leakage of the magnetic flux in the part can be further suppressed.

  A rotor 200 according to Modification 6 will be described with reference to FIGS. The rotor 200 according to the modified example 6 is provided with a slit 28 having a long hole shape in the vicinity of the leakage flux suppressing hole 26b in the iron core portion outside the magnet insertion hole 26.

  That is, the radial direction dimension Lb of the outer peripheral thin wall portion 27 b is set between the leakage magnetic flux suppression hole 26 b and the outer peripheral portion of the rotor core 20, and the radial dimension Lb between the leakage magnetic flux suppression hole 26 a and the outer peripheral portion of the rotor core 20. Since the iron core portion is set to be twice or more the radial dimension La of the outer peripheral thin portion 27a, the leakage magnetic flux of the permanent magnet 21 passing through the outer peripheral thin portion 27b is larger than the leakage magnetic flux of the permanent magnet 21 passing through the outer peripheral thin portion 27a. .

  By providing a long hole-shaped slit 28 in the vicinity of the leakage flux suppressing hole 26b in the outer core portion of the magnet insertion hole 26, the iron core portion between the leakage flux suppressing hole 26b and the outer peripheral portion of the rotor core 20 is provided. Even if the radial dimension Lb of the outer circumferential thin portion 27b is set to be not less than twice the radial dimension La of the outer circumferential thin portion 27a, the core portion between the leakage flux suppressing hole 26a and the outer circumferential portion of the rotor core 20 is reduced. The leakage magnetic flux of the permanent magnet 21 passing through 27b can be suppressed.

  The rotor 200 of the modification 7 is demonstrated with FIG. 21, FIG. The rotor 200 of the modified example 7 is the same as the rotor 200 of the modified example 3 of FIGS. 11 and 12, in which an elongated hole-shaped slit 28 is provided in the vicinity of the leakage flux suppressing hole 26 b in the iron core portion outside the magnet insertion hole 26. It is provided.

  By providing an elongated slit 28 in the vicinity of the leakage flux suppressing hole 26b in the iron core portion outside the magnet insertion hole 26, leakage flux suppression of the rotor 200 permanent magnet 21 of the third modification shown in FIGS. Magnetic flux leakage at the end of the hole 26b can be further suppressed.

FIG. 3 shows the first embodiment and is a cross-sectional view of the permanent magnet type motor 100. FIG. 2 shows the first embodiment, and is an enlarged view of a part A in FIG. 1. FIG. 5 shows the first embodiment and is a cross-sectional view of the rotor 200. FIG. 4 shows the first embodiment, and is an enlarged view of a portion B in FIG. 3. FIG. 5 shows the first embodiment, and is a diagram in which the permanent magnet 21 is omitted from FIG. 4. FIG. 5 shows the first embodiment, and is a view corresponding to FIG. FIG. 7 shows the first embodiment, and is a diagram in which the permanent magnet 21 is omitted from FIG. 6. FIG. 5 shows the first embodiment, and is a cross-sectional view of a rotor 200 of a second modification. FIG. 9 shows the first embodiment and is an enlarged view of a C part in FIG. 8. FIG. 10 shows the first embodiment and is a diagram in which the permanent magnet 21 is omitted from FIG. 9. FIG. 9 shows the first embodiment, and is a diagram corresponding to FIG. FIG. 12 shows the first embodiment and is a diagram in which the permanent magnet 21 is omitted from FIG. 11. FIG. 10 shows the first embodiment, and is a transverse cross-sectional view of a rotor 200 of a fourth modification. FIG. 14 shows the first embodiment and is an enlarged view of a D part in FIG. 13. FIG. 15 shows the first embodiment, and is a diagram in which the permanent magnet 21 is omitted from FIG. 14. FIG. 11 shows the first embodiment, and is a diagram corresponding to FIG. FIG. 17 shows the first embodiment and is a diagram in which the permanent magnet 21 is omitted from FIG. 16. FIG. 10 shows the first embodiment, and is a transverse cross-sectional view of a rotor 200 of a sixth modification. FIG. 19 shows the first embodiment and is an enlarged view of a portion E in FIG. 18. FIG. 20 shows the first embodiment and is a diagram in which the permanent magnet 21 is omitted from FIG. 19. FIG. 16 shows the first embodiment and is a diagram corresponding to FIG. FIG. 22 shows the first embodiment and is a diagram in which the permanent magnet 21 is omitted from FIG. 21.

Explanation of symbols

  10 Stator Core, 11 Slot, 11a Slot Opening, 12 Winding, 13 Slot Cell, 14 Wedge, 15 Void, 16 Core Back, 17 Teeth, 20 Rotor Core, 21 Permanent Magnet, 22 Magnet Insertion Hole, 23a Leakage Magnetic flux suppression hole, 23b Leakage magnetic flux suppression hole, 24 shaft hole, 25a Outer peripheral thin part, 25b Outer peripheral thin part, 26 Magnet insertion hole, 26a Leakage magnetic flux suppression hole, 26b Leakage magnetic flux suppression hole, 26c Permanent magnet insertion part, 27a Outer peripheral thin wall Part, 27b outer peripheral thin part, 28 slit, 100 permanent magnet type motor, 200 rotor, 300 stator.

Claims (5)

A rotor core configured by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape;
A plurality of magnet insertion holes formed along the outer periphery of the rotor core;
Two leakage flux suppression holes located at both circumferential ends of the magnet insertion hole;
A permanent magnet inserted between the two leakage flux suppression holes in the magnet insertion hole;
Two outer peripheral thin portions formed between the outer peripheral portion of the rotor core and the two leakage flux suppressing holes,
A rotor of a permanent magnet type motor characterized in that one of the two outer peripheral thin portions has a radial dimension that is at least twice as large as the other radial dimension.   The radial dimension of one of the two outer thin parts is at least twice the radial dimension of the other, and the angle of one of the two outer thin parts is set to the other circumferential direction. 2. The rotor of a permanent magnet type motor according to claim 1, wherein the rotor is at least twice the angle.   The outer thin part on the rotation direction side of the rotor of the permanent magnet type motor with respect to the magnet insertion hole is set as one of the two outer thin parts, and the permanent magnet type motor with respect to the magnet insertion hole The rotor of the permanent magnet type motor according to claim 1, wherein the thin outer peripheral portion on the counter-rotating direction side of the rotor is the other of the two thin outer peripheral portions.   In the magnet insertion hole, the two leakage flux suppression holes are formed at both ends of a permanent magnet insertion portion extending in the circumferential direction in which the permanent magnet is inserted, and the two leakage flux suppression holes are formed on the outer periphery of the rotor core. The rotor of a permanent magnet type motor according to any one of claims 1 to 3, wherein the rotor has a bathtub shape bent sideways.   5. The rotor of a permanent magnet type motor according to claim 4, wherein a slit is provided at least in the vicinity of the leakage magnetic flux suppressing hole on the side of the other outer thin portion at the outer iron core portion of the magnet insertion hole.

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