JP2011066999A - Rotor of permanent magnet motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor of a permanent magnet motor further reduced in the leakage of magnetic flux in a rotor core. <P>SOLUTION: The rotor 100 of the permanent magnet motor is equipped with: the rotor core 17 which is constituted by laminating a prescribed number of electromagnetic steel plates which are punched out in prescribed shapes; a plurality of magnet accommodation holes 11 which are formed along the external periphery of the rotor core 17; a pair of magnetic flux leakage suppression slits 13a, 13b which are formed at both ends of the magnet accommodation holes 11, connected to the magnet accommodation holes 11, and extended toward the center of a magnetic pole along the external periphery of the rotor core 17; permanent magnets 8 which are inserted into the magnet accommodation holes 11; and an external peripheral thinned part which is formed between the external periphery of the rotor core 17 and the magnetic flux leakage suppression slits 13a, 13b. A shape of the external peripheral thinned part is formed in such a waveform shape that the magnetic passage length of the external peripheral thinned part becomes long compared with the case where the external peripheral thinned part is linear or circular, and extends in the circumferential direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotor of a permanent magnet type motor.

  Conventionally, a stator having a stator core made of a large number of laminated steel sheets, a stator winding wound around the stator core, and a large number of layers provided to be rotatable in opposition to the stator. It is equipped with a rotor core made of a steel plate and a rotor having a permanent magnet that creates a pole, and there is an even number of poles, and an auxiliary magnetic pole is formed between the pole and the adjacent pole, constituting the rotor A hole or slit is provided by etching in the part between the steel plate part located on the stator side of the permanent magnet and the auxiliary magnetic pole of the steel plate to be machined, reducing the leakage of magnetic flux in the rotor core, and the stator core side There has been proposed a permanent magnet type motor in which the magnetic flux toward the surface is increased (see, for example, Patent Document 1).

JP 2009-033908

  However, the permanent magnet type motor described in Patent Document 1 includes only etching holes or slits provided in a portion between the steel plate portion located on the stator side of the permanent magnet and the auxiliary magnetic pole. However, there is a problem that the leakage magnetic flux cannot be sufficiently reduced.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotor of a permanent magnet type motor in which leakage magnetic flux in the rotor core is further reduced.

The rotor of the permanent magnet type motor according to the present invention includes 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;
A pair of leakage flux suppressing slits provided at both ends of the magnet insertion hole, connected to the magnet insertion hole, and extending in a direction toward the magnetic pole center along the outer peripheral portion of the rotor core;
A permanent magnet inserted into the magnet insertion hole;
An outer peripheral thin portion formed between the outer peripheral portion of the rotor core and the leakage flux suppressing slit,
The shape of the outer peripheral thin portion is a corrugated shape in which the magnetic path length of the outer peripheral thin portion is longer than that in the case where the outer peripheral thin portion extends in the circumferential direction with a straight line or an arc.

  The rotor of the permanent magnet type motor according to the present invention is such that the shape of the outer peripheral thin portion is such that the magnetic path length of the outer peripheral thin portion is longer than when the outer peripheral thin portion extends in the circumferential direction by a straight line or an arc. Because of the mold shape, the leakage magnetic flux in the rotor core can be further reduced.

FIG. 3 shows the first embodiment, and is a transverse sectional view of a rotor 100 of a permanent magnet type motor. The elements on larger scale of FIG. FIG. 5 shows the first embodiment and is a plan view of a rotor core 17. The elements on larger scale of FIG. FIG. 5 shows the first embodiment and is an enlarged view in the vicinity of a leakage flux suppressing slit 13a. FIG. 5 shows the first embodiment, and is a cross-sectional view of a rotor 200 of a permanent magnet type motor according to a first modification. The elements on larger scale of FIG. FIG. 5 shows the first embodiment, and is a plan view of a rotor core 27 of a first modification. The elements on larger scale of FIG. FIG. 5 shows the first embodiment and is an enlarged view in the vicinity of a leakage flux suppressing slit 23a. FIG. 5 shows the first embodiment, and is a cross-sectional view of a rotor 300 of a permanent magnet type motor according to a second modification. The elements on larger scale of FIG. FIG. 5 shows the first embodiment, and is a plan view of a rotor core 37 of a second modification. The elements on larger scale of FIG. FIG. 5 shows the first embodiment and is an enlarged view in the vicinity of a leakage flux suppressing slit 33a. FIG. 5 shows the first embodiment, and is a cross-sectional view of a rotor 400 of a permanent magnet type motor according to a third modification. The elements on larger scale of FIG. FIG. 5 shows the first embodiment and is a plan view of a rotor core 47 of a third modification. The elements on larger scale of FIG. FIG. 5 shows the first embodiment and is an enlarged view in the vicinity of a leakage flux suppressing slit 43a. FIG. 5 shows the first embodiment, and is a cross-sectional view of a rotor 500 of a permanent magnet type motor according to a fourth modification. The elements on larger scale of FIG. FIG. 9 shows the first embodiment and is a plan view of a rotor core 57 of a fourth modification. The elements on larger scale of FIG. FIG. 5 shows the first embodiment and is an enlarged view in the vicinity of a leakage flux suppressing slit 53a.

Embodiment 1 FIG.
1 to 25 show the first embodiment. FIG. 1 is a cross-sectional view of a rotor 100 of a permanent magnet motor, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 4 is a partially enlarged view of FIG. 3, FIG. 5 is an enlarged view of the vicinity of the leakage flux suppressing slit 13a, FIG. 6 is a cross-sectional view of the rotor 200 of the permanent magnet type motor of Modification 1, and FIG. 8 is a plan view of the rotor core 27 of the first modification, FIG. 9 is a partial enlarged view of FIG. 8, FIG. 10 is an enlarged view of the vicinity of the leakage flux suppressing slit 23a, and FIG. FIG. 12 is a partially enlarged view of FIG. 11, FIG. 13 is a plan view of the rotor core 37 of the second modification, FIG. 14 is a partially enlarged view of FIG. Is an enlarged view of the vicinity of the leakage flux suppressing slit 33a, and FIG. FIG. 17 is a partially enlarged view of FIG. 16, FIG. 18 is a plan view of the rotor core 47 of Modification 3, FIG. 19 is a partially enlarged view of FIG. 18, and FIG. 20 is an enlarged view of the vicinity of the leakage flux suppressing slit 43a. 21 is a cross-sectional view of a rotor 500 of a permanent magnet motor according to a fourth modification, FIG. 22 is a partially enlarged view of FIG. 21, FIG. 23 is a plan view of a rotor core 57 according to the fourth modification, and FIG. FIG. 25 is an enlarged view of the vicinity of the leakage flux suppressing slit 53a.

  A rotor 100 of a permanent magnet type motor will be described with reference to FIGS.

  Hereinafter, the rotor 100 of the permanent magnet type motor may be simply referred to as a rotor.

  In the rotor 100 of the permanent magnet type motor of the present embodiment, the shape of the rare earth permanent magnet 8 is a flat plate shape, and the six permanent magnets 8 are arranged so as to form a hexagon in the circumferential direction (see FIG. 1).

  However, this is only an example, and the type, number, shape, and arrangement of the permanent magnets 8 are not limited thereto.

  In FIG. 1, the rotor core 17 is a thin electromagnetic steel plate (for example, a thickness of about 0.1 to 0.5 mm, and a non-oriented electrical steel plate (so as not to show magnetic characteristics biased to a specific direction of the steel plate, The crystal axis direction of each crystal is arranged as randomly as possible))) is punched into a predetermined shape with a mold, and a predetermined number (multiple) is laminated.

  The rotor core 17 is formed with six magnet housing holes 11 having a rectangular cross section so as to form a hexagon in the circumferential direction (see FIG. 3).

  A six-pole rotor is formed by inserting six plate-shaped permanent magnets 8 magnetized so that N poles and S poles are alternately arranged inside the magnet housing hole 11.

  The permanent magnet 8 is made of rare earth mainly composed of neodymium, iron and boron.

  A pair of elongated leakage magnetic flux suppression slits 13a and 13b are provided at both ends of the magnet accommodation hole 11 in a direction toward the magnetic pole center (see FIGS. 1 and 4) along the circumferential direction. It has been.

As shown in FIG. 4, the distance B between the tip portions of the pair of leakage flux suppressing slits 13 a and 13 b in the same pole is sufficiently smaller than the length A in the longitudinal direction (circumferential direction) of the magnet housing hole 11. It is configured as follows. That is,
A >> B
Satisfy the relationship.

  Further, an outer peripheral thin portion 19 extending in the circumferential direction is formed between the leakage flux suppressing slits 13a and 13b and the outer peripheral portion 17a (see FIG. 5) of the rotor core 17 (see FIG. 5). However, FIG. 5 shows only the leakage flux suppressing slit 13a, but the same applies to the leakage flux suppressing slit 13b.

  The shape of the outer peripheral thin portion 19 is formed to be a sine wave. This is to lengthen the magnetic path of the outer peripheral thin portion 19.

  The thickness t (see FIG. 5) of the outer peripheral thin portion 19 is desirably as thin as possible within a range where the strength is allowable. For example, the thickness (0.1 to 0.5 mm) or less of the electromagnetic steel sheet Is preferable. This is to reduce the area of the magnetic path of the outer peripheral thin portion 19 and increase the magnetic resistance.

  As described above, the shape of the outer peripheral thin wall portion 19 extending in the circumferential direction formed between the leakage flux suppressing slits 13a and 13b and the outer peripheral portion 17a (see FIG. 5) of the rotor core 17 is formed in a sine wave shape, and By reducing the thickness t of the thin portion 19 as much as possible within the range where the strength is allowed, the magnetic path length of the outer thin portion 19 is increased, the magnetic path area is reduced, and the magnetic resistance is increased. Thus, the effect of suppressing the leakage magnetic flux closing inside the rotor core 17 is obtained.

  The rotor 200 of the permanent magnet type motor of Modification 1 will be described with reference to FIGS.

  The rotor 200 of the permanent magnet type motor of Modification 1 is also arranged so that the rare earth permanent magnet 8 has a flat plate shape and the six permanent magnets 8 form a hexagon in the circumferential direction (FIG. 6). FIG. 7).

  However, this is only an example, and the type, number, shape, and arrangement of the permanent magnets 8 are not limited thereto.

  In FIG. 6, the rotor core 27 is also a thin electromagnetic steel sheet (for example, with a thickness of about 0.1 to 0.5 mm, and a non-oriented electromagnetic steel sheet (not to show a magnetic characteristic biased to a specific direction of the steel sheet, The crystal axis direction of each crystal is arranged as randomly as possible))) is punched into a predetermined shape with a mold, and a predetermined number (multiple) is laminated.

  The rotor core 27 is formed with six magnet housing holes 11 having a rectangular cross section so as to form a hexagon in the circumferential direction (see FIG. 8).

  A six-pole rotor is formed by inserting six plate-shaped permanent magnets 8 magnetized so that N poles and S poles are alternately arranged inside the magnet housing hole 11.

  The permanent magnet 8 is made of rare earth mainly composed of neodymium, iron and boron.

  A pair of elongate leakage flux suppression slits 23a and 23b are provided at both ends of the magnet accommodation hole 11 in the direction toward the center of the magnetic pole (see FIGS. 6 and 9) along the circumferential direction. It has been.

As shown in FIG. 9, the distance B between the tips of the pair of leakage flux suppressing slits 23a, 23b in the same pole is sufficiently smaller than the length A in the longitudinal direction (circumferential direction) of the magnet housing hole 11. It is configured as follows. That is,
A >> B
Satisfy the relationship.

  Further, an outer peripheral thin portion 29 extending in the circumferential direction is formed between the leakage flux suppressing slits 23a and 23b and the outer peripheral portion 27a (see FIG. 10) of the rotor core 27 (see FIG. 10). However, FIG. 10 shows only the leakage flux suppressing slit 23a, but the same applies to the leakage flux suppressing slit 23b.

  The shape of the outer peripheral thin portion 29 is formed to have a sawtooth wave shape. This is to lengthen the magnetic path of the outer peripheral thin portion 29.

  The thickness t (see FIG. 10) of the outer peripheral thin portion 29 is desirably as thin as possible within a range where the strength is allowable. For example, the thickness (0.1 to 0.5 mm) or less of the electromagnetic steel sheet It is good. This is to reduce the area of the magnetic path of the outer peripheral thin portion 29 and increase the magnetic resistance.

  Thus, the shape of the outer peripheral thin portion 29 extending in the circumferential direction formed between the leakage flux suppressing slits 23 a and 23 b and the outer peripheral portion 27 a of the rotor core 27 is formed in a sawtooth wave shape, and the thickness of the outer peripheral thin portion 29. By making t as thin as possible within a range where the strength is allowed, the magnetic path length of the outer peripheral thin portion 29 is increased, the magnetic path area is reduced, and the magnetic resistance can be increased. An effect of suppressing leakage magnetic flux closing inside the iron core 27 is obtained.

  The rotor 300 of the permanent magnet type motor according to the second modification will be described with reference to FIGS. 11 to 15.

  The rotor 300 of the permanent magnet type motor of Modification 2 is also arranged so that the rare earth permanent magnet 8 has a flat plate shape and the six permanent magnets 8 form a hexagon in the circumferential direction (FIG. 11). FIG. 12).

  However, this is only an example, and the type, number, shape, and arrangement of the permanent magnets 8 are not limited thereto.

  In FIG. 11, the rotor core 37 is also a thin electromagnetic steel sheet (for example, a thickness of about 0.1 to 0.5 mm, and a non-oriented electromagnetic steel sheet (not to show a magnetic characteristic biased to a specific direction of the steel sheet, The crystal axis direction of each crystal is arranged as randomly as possible))) is punched into a predetermined shape with a mold, and a predetermined number (multiple) is laminated.

  In the rotor core 37, six magnet housing holes 11 having a rectangular cross section are formed so as to form a hexagon in the circumferential direction (see FIG. 13).

  A six-pole rotor is formed by inserting six plate-shaped permanent magnets 8 magnetized so that N poles and S poles are alternately arranged inside the magnet housing hole 11.

  The permanent magnet 8 is made of rare earth mainly composed of neodymium, iron and boron.

  A pair of elongate leakage flux suppression slits 33a and 33b are provided at both ends of the magnet accommodation hole 11 in the direction toward the magnetic pole center (see FIGS. 11 and 14) along the circumferential direction. It has been.

As shown in FIG. 14, the distance B between the tip portions of the pair of leakage flux suppressing slits 33 a and 33 b in the same pole is sufficiently smaller than the length A in the longitudinal direction (circumferential direction) of the magnet housing hole 11. It is configured as follows. That is,
A >> B
Satisfy the relationship.

  Further, an outer peripheral thin portion 39 extending in the circumferential direction is formed between the leakage magnetic flux suppressing slits 33a and 33b and the outer peripheral portion 37a (see FIG. 15) of the rotor core 37 (see FIG. 15). However, FIG. 15 shows only the leakage flux suppressing slit 33a, but the same applies to the leakage flux suppressing slit 33b.

  The shape of the outer peripheral thin portion 39 is formed to have a rectangular wave shape. This is to lengthen the magnetic path of the outer peripheral thin portion 39.

  The thickness t (see FIG. 15) of the outer peripheral thin portion 39 is desirably as thin as possible within a range where the strength is allowable. For example, the thickness (0.1 to 0.5 mm) or less of the electromagnetic steel sheet It is good. This is to reduce the area of the magnetic path of the outer peripheral thin portion 39 and increase the magnetic resistance.

  As described above, the shape of the outer peripheral thin portion 39 extending in the circumferential direction formed between the leakage flux suppressing slits 33a and 33b and the outer peripheral portion 37a of the rotor core 37 is formed in a rectangular wave shape, and the thickness of the outer peripheral thin portion 39 is also formed. By reducing t as much as possible within a range where the strength is allowed, the magnetic path length of the outer peripheral thin portion 39 is increased, the magnetic path area is reduced, and the magnetic resistance can be increased. The effect of suppressing the leakage magnetic flux closing inside the iron core 37 is obtained.

  A rotor 400 of a permanent magnet type motor according to Modification 3 will be described with reference to FIGS.

  The rotor 400 of the permanent magnet type motor of Modification 3 is also arranged so that the rare earth permanent magnet 8 has a flat plate shape and the six permanent magnets 8 form a hexagon in the circumferential direction (FIG. 16). reference).

  However, this is only an example, and the type, number, shape, and arrangement of the permanent magnets 8 are not limited thereto.

  In FIG. 16, the rotor core 47 is also a thin electromagnetic steel plate (for example, with a thickness of about 0.1 to 0.5 mm, a non-oriented electrical steel plate (so as not to show magnetic characteristics biased to a specific direction of the steel plate, The crystal axis direction of each crystal is randomly arranged as much as possible))) is punched into a predetermined shape with a mold, and a predetermined number (plural) are laminated.

  The rotor core 47 is formed with six magnet housing holes 11 having a rectangular cross section so as to form a hexagon in the circumferential direction (see FIG. 18).

  A six-pole rotor is formed by inserting six plate-shaped permanent magnets 8 magnetized so that N poles and S poles are alternately arranged inside the magnet housing hole 11.

  The permanent magnet 8 is made of rare earth mainly composed of neodymium, iron and boron.

  A pair of elongated leakage magnetic flux suppression slits 43a and 43b are provided at both ends of the magnet accommodation hole 11 in a direction toward the magnetic pole center (see FIGS. 16 and 19) along the circumferential direction. It has been.

As shown in FIG. 19, the distance B between the tips of the pair of leakage flux suppressing slits 43a and 43b in the same pole is sufficiently smaller than the length A in the longitudinal direction (circumferential direction) of the magnet housing hole 11. It is configured as follows. That is,
A >> B
Satisfy the relationship.

  Further, an outer peripheral thin portion 49 extending in the circumferential direction is formed between the leakage flux suppressing slits 43a and 43b and the outer peripheral portion 47a (see FIG. 20) of the rotor core 47 (see FIG. 20). However, FIG. 20 shows only the leakage flux suppressing slit 43a, but the same applies to the leakage flux suppressing slit 43b.

  The shape of the outer peripheral thin portion 49 is formed to be a trapezoidal wave shape. This is to lengthen the magnetic path of the outer peripheral thin portion 49.

  The thickness t (see FIG. 20) of the outer peripheral thin portion 49 is desirably as thin as possible within a range where the strength is allowable. For example, the thickness (0.1 to 0.5 mm) or less of the electromagnetic steel sheet It is good. This is to reduce the area of the magnetic path of the outer peripheral thin portion 49 and increase the magnetic resistance.

  As described above, the shape of the outer peripheral thin portion 49 extending in the circumferential direction formed between the leakage flux suppressing slits 43 a and 43 b and the outer peripheral portion 47 a of the rotor core 47 is formed in a trapezoidal wave shape and the thickness of the outer peripheral thin portion 49. By making t as thin as possible within the range where the strength is allowed, the magnetic path length of the outer peripheral thin portion 49 is increased, the magnetic path area is reduced, and the magnetic resistance can be increased. The effect of suppressing the leakage magnetic flux closing inside the iron core 37 is obtained.

  A rotor 500 of a permanent magnet type motor according to Modification 4 will be described with reference to FIGS.

  The rotor 500 of the permanent magnet type motor of Modification 4 is also arranged so that the rare earth permanent magnet 8 has a flat plate shape and the six permanent magnets 8 form a hexagon in the circumferential direction (FIG. 21). reference).

  However, this is only an example, and the type, number, shape, and arrangement of the permanent magnets 8 are not limited thereto.

  In FIG. 21, the rotor core 57 is also a thin electromagnetic steel plate (for example, a thickness of about 0.1 to 0.5 mm, and a non-oriented electromagnetic steel plate (so as not to show magnetic characteristics biased to a specific direction of the steel plate, The crystal axis direction of each crystal is arranged as randomly as possible))) is punched into a predetermined shape with a mold, and a predetermined number (multiple) is laminated.

  The rotor core 57 is formed with six magnet housing holes 11 having a rectangular cross section so as to form a hexagon in the circumferential direction (see FIG. 23).

  A six-pole rotor is formed by inserting six plate-shaped permanent magnets 8 magnetized so that N poles and S poles are alternately arranged inside the magnet housing hole 11.

  The permanent magnet 8 is made of rare earth mainly composed of neodymium, iron and boron.

  A pair of elongated leakage magnetic flux suppression slits 53a and 53b are provided at both ends of the magnet housing hole 11 and connected to the magnet housing hole 11 in the direction toward the magnetic pole center (see FIGS. 21 and 24) along the circumferential direction. It has been.

As shown in FIG. 24, the distance B between the tips of the pair of leakage flux suppressing slits 53a, 53b in the same pole is sufficiently smaller than the length A in the longitudinal direction (circumferential direction) of the magnet housing hole 11. It is configured as follows. That is,
A >> B
Satisfy the relationship.

  Further, an outer peripheral thin portion 59 extending in the circumferential direction is formed between the leakage flux suppressing slits 53a and 53b and the outer peripheral portion 57a (see FIG. 25) of the rotor core 57 (see FIG. 25). However, FIG. 25 shows only the leakage flux suppressing slit 53a, but the same applies to the leakage flux suppressing slit 53b.

  The shape of the outer peripheral thin portion 59 is formed to have a triangular wave shape. This is because the magnetic path of the outer peripheral thin portion 59 is lengthened.

  The thickness t (see FIG. 25) of the outer peripheral thin portion 59 is desirably as thin as possible within a range where the strength is allowable. For example, the thickness (0.1 to 0.5 mm) or less of the electromagnetic steel sheet It is good. This is to reduce the area of the magnetic path of the outer peripheral thin portion 59 and increase the magnetic resistance.

  Thus, the shape of the outer peripheral thin portion 59 extending in the circumferential direction formed between the leakage flux suppressing slits 53a and 53b and the outer peripheral portion 57a of the rotor core 57 is formed in a triangular wave shape, and the thickness of the outer peripheral thin portion 59 is increased. By making t as thin as possible within the range where the strength is allowed, the magnetic path length of the outer peripheral thin portion 59 is increased, the magnetic path area is reduced, and the magnetic resistance can be increased. The effect of suppressing the leakage magnetic flux closing inside the iron core 37 is obtained.

  If the magnetic path length of the outer peripheral thin portion can be increased, the shape of the outer peripheral thin portion may be formed to be a combined wave of a sine wave shape, a sawtooth wave shape, a rectangular wave shape, a trapezoidal wave shape, and a triangular wave shape. .

  Moreover, as a manufacturing method of the rotor cores 17 to 57, punching using a press machine is also possible, but the circumferential length of the outer peripheral thin portions 19 to 59 is increased as in the present embodiment, When the rotor cores 17 to 57 in which the outer peripheral thin portions 19 to 59 are formed with a small thickness are punched out by press working, a plastic deformation layer is formed by mechanical shearing, cutting and breaking, and the strength of the electrical steel sheet is greatly increased. It will deteriorate.

  Therefore, for example, the strength of the rotor can be remarkably improved by making it by photoetching without a plastic deformation layer.

  8 Permanent magnet, 11 Magnet housing hole, 13a Leakage magnetic flux suppression slit, 13b Leakage magnetic flux suppression slit, 17 Rotor core, 17a Outer peripheral portion, 19 Outer peripheral thin wall portion, 23a Leakage magnetic flux suppression slit, 23b Leakage magnetic flux suppression slit, 27 Rotor Iron core, 27a outer peripheral portion, 29 outer peripheral thin portion, 33a leakage magnetic flux suppression slit, 33b leakage magnetic flux suppression slit, 37 rotor core, 37a outer peripheral portion, 39 outer thin portion, 43a leakage magnetic flux suppression slit, 43b leakage magnetic flux suppression slit, 47 Rotor core, 47a outer peripheral part, 49 outer thin part, 53a leakage magnetic flux suppression slit, 53b leakage magnetic flux suppression slit, 57 rotor magnetic core, 57a outer peripheral part, 59 outer thin part, 100 permanent magnet motor rotor, 200 permanent Magnet type motor rotor, 300 Permanent magnet type motor Trochanter, 400 permanent magnet motor rotor, 500 a permanent magnet type motor rotor.

Claims (9)

A rotor core constructed by laminating a predetermined number of magnetic steel sheets punched into a predetermined shape;
A plurality of magnet insertion holes formed along the outer periphery of the rotor core;
A pair of leakage flux suppressing slits provided at both ends of the magnet insertion hole, connected to the magnet insertion hole, and extending in a direction toward the magnetic pole center along the outer peripheral portion of the rotor core;
A permanent magnet inserted into the magnet insertion hole;
An outer peripheral thin portion formed between an outer peripheral portion of the rotor core and the leakage flux suppressing slit,
The shape of the outer peripheral thin portion is a wave shape that makes the magnetic path length of the outer peripheral thin portion longer than that when the outer peripheral thin portion extends in the circumferential direction by a straight line or an arc. Magnet type motor rotor. The distance B between the pair of leakage flux suppression tips in the same pole and the circumferential length A of the magnet insertion hole are:
A >> B
The rotor of a permanent magnet type motor according to claim 1, wherein the relationship is satisfied.   3. The rotor of a permanent magnet type motor according to claim 1, wherein a thickness of the outer peripheral thin portion is equal to or less than a thickness of the electromagnetic steel plate.   The rotor of a permanent magnet type motor according to any one of claims 1 to 3, wherein the wave shape is a sine wave shape.   The rotor of a permanent magnet type motor according to any one of claims 1 to 3, wherein the wave shape is a rectangular wave shape.   The rotor of a permanent magnet type motor according to any one of claims 1 to 3, wherein the wave shape is a sawtooth wave shape.   The rotor of a permanent magnet type motor according to any one of claims 1 to 3, wherein the wave shape is a trapezoidal wave shape.   The rotor of a permanent magnet type motor according to any one of claims 1 to 3, wherein the wave shape is a triangular wave shape.   The rotor of a permanent magnet type motor according to any one of claims 1 to 8, wherein at least a peripheral portion of the outer peripheral thin portion is processed by etching.

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