WO2020213081A1 - Rotor, motor, compressor, and air conditioner - Google Patents

Abstract

This rotor (2) has P (P is an integer of 2 or more) magnetic poles. When a line passing through the boundary (B1) between a first inside (221a) and a first outside curved portion (221b) and the rotational center of the rotor (2) is denoted by L1, a line passing through the boundary (B2) between a second inside (222a) and a second outside curved portion (222b) and the rotational center of the rotor (2) is denoted by L2, and an angle between the line L1 and the line L2 is denoted by θ [degree], the rotor (2) satisfies a relationship of 251.7/P ≦ θ ≦ 255/P.

Description

Rotors, motors, compressors, and air conditioners

The present invention relates to a rotor of a motor.

A rotor having a rotor core provided with a flux barrier and a slit is generally known. In this rotor, the flux barrier reduces the leakage flux and the slit regulates the amount of magnetic flux passing through the rotor (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-217250

However, with the conventional technology, it is difficult for the magnetic flux from the stator to pass between the flux barrier and the slit. For example, when the magnetic flux from the stator hits the flux barrier or slit, the magnetic flux bends. An increase in the bending of the magnetic flux leads to an increase in the cogging torque. As the cogging torque increases, the torque ripple during driving of the motor increases, resulting in increased vibration and noise in the motor.

An object of the present invention is to solve the above-mentioned problems and reduce vibration and noise in the motor.

The rotor according to one aspect of the present invention
A rotor with P magnetic poles (P is an integer of 2 or more).
With permanent magnets
A magnet insertion hole having a magnet arrangement portion in which the permanent magnet is arranged, a first flux barrier portion communicating with the magnet arrangement portion, and a second flux barrier portion communicating with the magnet arrangement portion. A first end slit located between the first flux barrier portion and the second flux barrier portion and facing the first flux barrier portion, the first flux barrier portion, and the first flux barrier portion. A rotor core located between the two flux barrier portions and having a second end slit facing the second flux barrier portion is provided.
The rotor core
The first inner side that defines the first flux barrier portion and faces the first end slit, and
A first outer curvature that defines the first flux barrier, is adjacent to the first inner edge, and is located between the first inner edge and the outer peripheral surface of the rotor core. Department and
A second inner side that defines the second flux barrier portion and faces the second end slit, and
A second outer curvature that defines the second flux barrier, is adjacent to the second inner edge, and is located between the second inner edge and the outer peripheral surface of the rotor core. Has a part and
In a plane orthogonal to the axial direction of the rotor, a straight line passing through the first boundary between the first inner side and the first outer curved portion and the rotation center of the rotor is defined as L1, and the second The straight line passing through the second boundary between the inner side and the second outer curved portion and the rotation center of the rotor is L2, and the angle between the straight line L1 and the straight line L2 is θ [degree]. When you do
251.7 / P ≤ θ ≤ 255 / P
Meet.
The rotor according to another aspect of the present invention
A rotor with P magnetic poles (P is an integer of 2 or more).
With permanent magnets
A magnet insertion hole having a magnet arrangement portion in which the permanent magnet is arranged, a first flux barrier portion communicating with the magnet arrangement portion, and a second flux barrier portion communicating with the magnet arrangement portion. A first end slit located between the first flux barrier portion and the second flux barrier portion and facing the first flux barrier portion, the first flux barrier portion, and the first flux barrier portion. A rotor core located between the two flux barrier portions and having a second end slit facing the second flux barrier portion is provided.
The rotor core
The first inner side that defines the first flux barrier portion and faces the first end slit, and
A first outer curvature that defines the first flux barrier, is adjacent to the first inner edge, and is located between the first inner edge and the outer peripheral surface of the rotor core. Department and
A second inner side that defines the second flux barrier portion and faces the second end slit, and
A second outer curvature that defines the second flux barrier, is adjacent to the second inner edge, and is located between the second inner edge and the outer peripheral surface of the rotor core. Has a part and
When the shortest distance from the first end slit to the magnet insertion hole is D1 [mm],
0.365 ≤ D1 ≤ 0.865
Meet.
The motor according to another aspect of the present invention
With the stator
It includes a rotor according to one aspect of the present invention or a rotor according to another aspect of the present invention, which is arranged inside the stator.
The compressor according to another aspect of the present invention
With a closed container
With the compression device arranged in the closed container,
It includes the motor that drives the compression device.
The air conditioner according to another aspect of the present invention is
With the compressor
Equipped with a heat exchanger.

According to the present invention, vibration and noise in the motor can be reduced.

It is sectional drawing which shows typically the structure of the motor which concerns on Embodiment 1 of this invention. It is a top view which shows the structure of a rotor. It is an enlarged view which shows the structure of a part of the rotor shown in FIG. It is an enlarged view which shows the structure of a part of a rotor. It is an enlarged view which shows the structure of a part of a rotor. It is an enlarged view which shows the structure of a part of a rotor. It is an enlarged view which shows the structure of a part of a rotor. It is a figure which shows the magnetic flux which flows from a stator to a rotor. It is a graph which shows the cogging torque generated in a motor. It is a figure which shows another example of a rotor. It is an enlarged view which shows the structure of a part of a rotor. It is an enlarged view which shows the structure of a part of a rotor. It is a figure which shows the magnetic flux which flows from the stator to the rotor shown in FIG. It is a figure which shows another example of a rotor. It is an enlarged view which shows the structure of a part of a rotor. It is an enlarged view which shows the structure of a part of a rotor. It is a figure which shows the magnetic flux which flows from the stator to the rotor shown in FIG. It is a figure which shows another example of a rotor. It is an enlarged view which shows the structure of a part of a rotor. It is an enlarged view which shows the structure of a part of a rotor. 6 is a graph showing the relationship between the distance from the first end slit to the first flux barrier portion and the cogging torque generated in the motor. It is a graph which shows the relationship between the distance from a 1st end slit to a magnet insertion hole, and the cogging torque generated in a motor. It is sectional drawing which shows schematic structure of the compressor which concerns on Embodiment 2 of this invention. It is a figure which shows roughly the structure of the refrigerating air conditioner which concerns on Embodiment 3 of this invention.

Embodiment 1.
In the xyz Cartesian coordinate system shown in each figure, the z-axis direction (z-axis) indicates a direction parallel to the axis Ax of the motor 1, and the x-axis direction (x-axis) is orthogonal to the z-axis direction (z-axis). The y-axis direction (y-axis) indicates a direction orthogonal to both the z-axis direction and the x-axis direction. The axis Ax is the center of rotation of the rotor 2. The direction parallel to the axis Ax is also referred to as "axial direction of rotor 2" or simply "axial direction". The radial direction is the radial direction of the rotor 2 or the stator 3, and is the direction orthogonal to the axis Ax. The xy plane is a plane orthogonal to the axial direction. The arrow A1 indicates the circumferential direction centered on the axis Ax. The circumferential direction of the rotor 2 or the stator 3 is also simply referred to as "circumferential direction".

FIG. 1 is a cross-sectional view schematically showing the structure of the motor 1 according to the first embodiment of the present invention.
The motor 1 has a rotor 2 having P (P is an integer of 2 or more) magnetic poles and a stator 3. The motor 1 is, for example, a permanent magnet synchronous motor (also referred to as a brushless DC motor) such as a permanent magnet embedded motor. The motor 1 may further include a motor frame 4 (also simply referred to as a "frame") that covers the stator 3.

The motor 1 is driven by, for example, inverter control. This enables motor control in consideration of the cogging torque generated in the motor 1. As a result, fluctuations in torque ripple that occur while driving the motor 1 can be suppressed, and vibration and noise in the motor 1 can be reduced.

FIG. 2 is a plan view showing the structure of the rotor 2.
The rotor 2 is rotatably arranged inside the stator 3. The rotor 2 has a rotor core 21, at least one permanent magnet 22, and a shaft 23. In the present embodiment, the rotor 2 is a permanent magnet embedded rotor.

There is an air gap between the rotor 2 (specifically, the outer peripheral surface 21a of the rotor core 21) and the stator 3. The air gap between the rotor 2 and the stator 3 is, for example, 0.3 mm to 1 mm. When a current having a frequency synchronized with the command rotation speed is supplied to the winding 32 of the stator 3, a rotating magnetic field is generated in the stator 3, and the rotor 2 rotates.

The rotor core 21 is fixed to the shaft 23 by a fixing method such as shrink fitting or press fitting. When the rotor 2 rotates, rotational energy is transmitted from the rotor core 21 to the shaft 23.

The stator 3 has a stator core 31, at least one winding 32, and at least one slot 33 in which the winding 32 is arranged. The stator core 31 has an annular yoke 311 and a plurality of teeth 312. In the example shown in FIG. 1, the stator core 31 has nine teeth 312 and nine slots 33. Each slot 33 is a space between teeth 312 adjacent to each other.

However, the number of teeth 312 is not limited to nine. Similarly, the number of slots 33 is not limited to nine.

The plurality of teeth 312 are located radially. In other words, the plurality of teeth 312 are arranged at equal intervals in the circumferential direction of the stator core 31. Each tooth 312 extends from the yoke 311 toward the center of rotation of the rotor 2.

Each tooth 312 has, for example, a main body portion extending in the radial direction and a tooth tip portion located at the tip of the main body portion and extending in the circumferential direction.

The plurality of teeth 312 and the plurality of slots 33 are alternately arranged at equal intervals in the circumferential direction of the stator core 31.

The stator core 31 is an annular iron core. The stator core 31 has a plurality of electromagnetic steel plates laminated in the axial direction. These electrical steel sheets are fixed to each other by caulking. Each of the plurality of electrical steel sheets is punched so as to have a predetermined shape. The thickness of each of the plurality of electrical steel sheets is, for example, 0.1 mm to 0.7 mm. In the present embodiment, the thickness of each of the plurality of electromagnetic steel sheets is 0.35 mm.

A winding 32 is wound around each tooth 312, whereby the winding 32 is arranged in each slot 33. For example, the winding 32 is wound around each tooth 312 in a concentrated winding. It is desirable that an insulator is arranged between the winding 32 and each tooth 312.

The winding 32 forms a coil that generates a rotating magnetic field. The coil is, for example, a three-phase coil. In this case, the connection method is, for example, Y connection. The winding 32 is, for example, a magnet wire having a diameter of 1 mm. When a current flows through the winding 32, a rotating magnetic field is generated. The number of turns and the diameter of the winding 32 are set according to the voltage applied to the winding 32, the rotation speed of the motor 1, the cross-sectional area of the slot 33, and the like. The number of turns of the winding 32 is, for example, 80.

The structure of the rotor 2 will be specifically described.
FIG. 3 is an enlarged view showing a partial structure of the rotor 2 shown in FIG.

The rotor 2 has a plurality of magnetic pole centers and a plurality of interpole portions. In the example shown in FIG. 2, each magnetic pole center is indicated by a magnetic pole center line C1, and each pole-to-pole portion is indicated by an interpole line C2. That is, each magnetic pole center line C1 passes through the magnetic pole center of the rotor 2, and each pole interpole line C2 passes through the interpole portion of the rotor 2.

The center of each magnetic pole is located at the center of each magnetic pole of the rotor 2 (that is, the north pole or the south pole of the rotor 2). Each magnetic pole of the rotor 2 (also simply referred to as "each magnetic pole" or "magnetic pole") means a region that serves as the north pole or the south pole of the rotor 2.

The inter-pole portion is the boundary between two magnetic poles (that is, the north and south poles of the rotor 2) that are adjacent to each other in the circumferential direction.

The rotor core 21 has a plurality of electromagnetic steel plates laminated in the axial direction. These electrical steel sheets are fixed to each other by caulking. Each of the plurality of electrical steel sheets is punched so as to have a predetermined shape. The thickness of each of the plurality of electrical steel sheets is, for example, 0.1 mm to 0.7 mm. In the present embodiment, the thickness of each of the plurality of electromagnetic steel sheets 210 is 0.35 mm.

The rotor core 21 has at least one magnet insertion hole 211, a shaft hole 212, and at least one end slit 213.

In the present embodiment, the rotor core 21 has a plurality of magnet insertion holes 211 (specifically, six magnet insertion holes 211). In the xy plane, the plurality of magnet insertion holes 211 are arranged in the circumferential direction. The number of magnetic poles P of the rotor 2 is 2 or more. The range of the number of magnetic poles P is preferably an even number of 4 to 10, that is, 4, 6, 8 or 10.

Each magnet insertion hole 211 corresponds to each magnetic pole of the rotor 2. Therefore, in the present embodiment, the number of magnetic poles of the rotor 2 is 6 poles. At least one permanent magnet 22 is arranged in each magnet insertion hole 211.

In the xy plane, the central portion of the magnet insertion hole 211 protrudes toward the axis Ax. That is, in the xy plane, each magnet insertion hole 211 has a V shape. The shape of each magnet insertion hole 211 is not limited to the V shape, and may be, for example, a straight shape.

In the present embodiment, two permanent magnets 22 are arranged in one magnet insertion hole 211. That is, two permanent magnets 22 in one magnet insertion hole 211 form one magnetic pole of the rotor 2. In the xy plane, a set of permanent magnets 22 are arranged in one magnet insertion hole 211 so as to have a V shape. In this embodiment, the rotor 2 has 12 permanent magnets 22.

The shaft 23 is fixed to the shaft hole 212 by a method such as shrink fitting or press fitting.

Each permanent magnet 22 is a flat plate-shaped magnet that is long in the axial direction. Each permanent magnet 22 is magnetized in a direction orthogonal to the longitudinal direction of the permanent magnet 22 in the xy plane. That is, in the xy plane, each permanent magnet 22 is magnetized in the lateral direction of each permanent magnet 22. Each permanent magnet 22 is a rare earth magnet containing, for example, neodymium (Nd), iron (Fe), and boron (B).

The north or south poles of the two permanent magnets 22 arranged in one magnet insertion hole 211 face the outside or the inside in the radial direction of the rotor 2. As a result, the set of permanent magnets 22 (specifically, the two permanent magnets 22) arranged in one magnet insertion hole 211 serves as one magnetic pole of the rotor 2. That is, at one magnetic pole of the rotor 2, a set of permanent magnets 22 (specifically, two permanent magnets 22) functions as north poles or south poles with respect to the stator 3.

As shown in FIG. 2, the rotor core 21 may further have a plurality of inner slits 214. The plurality of inner slits 214 are located between the two end slits 213.

Each magnet insertion hole 211 communicates with a magnet arrangement portion 2110 in which at least one permanent magnet 22 is arranged, a first flux barrier portion 2111 communicating with the magnet arrangement portion 2110, and a magnet arrangement portion 2110. It has a second flux barrier portion 2112.

In the xy plane, the first flux barrier portion 2111 and the second flux barrier portion 2112 are located on both sides of the magnet insertion hole 211, respectively. That is, the magnet arranging portion 2110 is located between the first flux barrier portion 2111 and the second flux barrier portion 2112.

The first flux barrier portion 2111 is a through hole penetrating the rotor 2 in the axial direction. As a result, the first flux barrier portion 2111 reduces the leakage flux. Similarly, the second flux barrier portion 2112 is a through hole penetrating the rotor 2 in the axial direction. As a result, the second flux barrier portion 2112 reduces the leakage flux.

In the present embodiment, the rotor core 21 has a plurality of end slits 213. Specifically, at each magnetic pole of the rotor 2, two end slits 213 are provided in the rotor core 21.

Between the first flux barrier portion 2111 and the second flux barrier portion 2112, one of the two end slits 213 is provided on one end side of the magnet insertion hole 211, and the other end slit. The 213 is provided on the other end side of the magnet insertion hole 211. In other words, between the first flux barrier portion 2111 and the second flux barrier portion 2112, one of the two end slits 213 faces one end of the magnet insertion hole 211 and the other. The end slit 213 faces the other end of the magnet insertion hole 211. As a result, each end slit 213 adjusts the direction of the magnetic flux in the rotor 2.

The plurality of end slits 213 include at least one first end slit 2131 and at least one second end slit 2132. In the example shown in FIGS. 2 and 3, at each magnetic pole of the rotor 2, one first end slit 2131 and one second end slit 2132 are formed between the magnet insertion holes 211 and the outer peripheral surface 21a of the rotor core 21. It is provided in between.

As shown in FIGS. 2 and 3, two end slits 213 (that is, the first end slit 2131 and the second end slit 2132) are formed on the magnet insertion hole 211 and the outer peripheral surface 21a of the rotor core 21 for one magnetic pole. It is provided between. Therefore, in this embodiment, the rotor core 21 has 12 end slits 213.

FIG. 4 is an enlarged view showing a part of the structure of the rotor 2. Specifically, FIG. 4 is an enlarged view showing the structure of the region E1 surrounded by the broken line in FIG.
As shown in FIGS. 3 and 4, the first end slit 2131 is located between the first flux barrier portion 2111 and the second flux barrier portion 2112, and the first flux barrier portion 2111. Facing. The first end slit 2131 is the first of a plurality of slits (that is, the end slit 213 and the plurality of inner slits 214) provided between the first flux barrier portion 2111 and the second flux barrier portion 2112. This is the slit closest to the flux barrier portion 2111 of.

FIG. 5 is an enlarged view showing a part of the structure of the rotor 2. Specifically, FIG. 5 is an enlarged view showing the structure of the region E2 surrounded by the broken line in FIG.
As shown in FIGS. 3 and 5, the second end slit 2132 is located between the first flux barrier portion 2111 and the second flux barrier portion 2112, and the second flux barrier portion 2112. Facing. The second end slit 2132 is a second of a plurality of slits (that is, an end slit 213 and a plurality of inner slits 214) provided between the first flux barrier portion 2111 and the second flux barrier portion 2112. This is the slit closest to the flux barrier portion 2112 of.

A part of the rotor core 21 existing outside the first flux barrier portion 2111 in the radial direction, that is, the region between the outer peripheral surface 21a of the rotor core 21 and the first flux barrier portion 2111 is thin-walled to reduce the leakage flux. It is a department. The width of the thin portion in the radial direction is, for example, equal to or larger than the thickness of each electromagnetic steel plate of the rotor core 21. However, it is desirable that the width of the thin portion in the radial direction is the same as the thickness of each electromagnetic steel plate of the rotor core 21, for example. Thereby, the increase of the leakage flux can be effectively suppressed.

Similarly, a part of the rotor core 21 existing outside the second flux barrier portion 2112 in the radial direction, that is, the region between the outer peripheral surface 21a of the rotor core 21 and the second flux barrier portion 2112 causes leakage flux. It is a thin part to be reduced. The width of the thin portion in the radial direction is, for example, equal to or larger than the thickness of each electromagnetic steel plate of the rotor core 21. However, it is desirable that the width of the thin portion in the radial direction is the same as the thickness of each electromagnetic steel plate of the rotor core 21, for example. Thereby, the increase of the leakage flux can be effectively suppressed.

The rotor core 21 has a first inner side 221a, a first outer curved portion 221b, and a first outer side 221c.

The first inner side 221a defines the first flux barrier portion 2111 and faces the first end slit 2131.

The first outer curved portion 221b defines the first flux barrier portion 2111, is adjacent to the first inner side 221a, and is between the first inner side 221a and the first outer side 221c. It is provided and is located between the first inner side 221a and the outer peripheral surface 21a of the rotor core 21. The first outer curved portion 221b is a curved side.

The first outer side 221c defines the first flux barrier portion 2111 and extends in the circumferential direction of the rotor core 21.

The distance D1 is the shortest distance from the first end slit 2131 to the magnet insertion hole 211.

The rotor core 21 has one or more sides or curved portions that define the first flux barrier portion 2111 in addition to the first inner side 221a, the first outer curved portion 221b, and the first outer side 221c. May be good.

The rotor core 21 has a second inner side 222a, a second outer curved portion 222b, and a second outer side 222c.

The second inner side 222a defines the second flux barrier portion 2112 and faces the second end slit 2132.

The second outer curved portion 222b defines the second flux barrier portion 2112, is adjacent to the second inner side 222a, and is between the second inner side 222a and the second outer side 222c. It is provided and is located between the second inner side 222a and the outer peripheral surface 21a of the rotor core 21. The second outer curved portion 222b is a curved side.

The second outer side 222c defines the second flux barrier portion 2112 and extends in the circumferential direction of the rotor core 21.

The distance D2 is the shortest distance from the second end slit 2132 to the magnet insertion hole 211.

In addition to the second inner side 222a, the second outer curved portion 222b, and the second outer side 222c, the rotor core 21 has one or more sides or curved portions that define the second flux barrier portion 2112. May be good.

As shown in FIG. 3, in a plane orthogonal to the axial direction of the rotor 2, the boundary B1 (also referred to as the first boundary) and the rotor 2 between the first inner side 221a and the first outer curved portion 221b. Let L1 be the straight line passing through the center of rotation of the rotor 2, and let L2 be the straight line passing through the boundary B2 (also referred to as the second boundary) between the second inner side 222a and the second outer curved portion 222b and the center of rotation of the rotor 2. , When the angle between the straight line L1 and the straight line L2 is θ [degree], the rotor 2 satisfies 251.7 / P ≦ θ ≦ 255 / P.

Boundary B1 and boundary B2 are symmetrical with respect to the magnetic pole center line C1.

FIG. 6 is an enlarged view showing a part of the structure of the rotor 2. Specifically, FIG. 6 is an enlarged view showing the structure of the region E1 surrounded by the broken line in FIG.
The rotor core 21 has a first end slit side 231a, a first end slit curved portion 231b, a side 231c (also referred to as a third end slit side), and a side 211a.

The first end slit side 231a defines the first end slit 2131 and faces the first flux barrier portion 2111.

The first end slit curved portion 231b defines the first end slit 2131, is adjacent to the first end slit side 231a, and is provided between the first end slit side 231a and the side 231c. It is located between the first end slit side 231a and the magnet insertion hole 211.

The side 231c defines the first end slit 2131, is adjacent to the first end slit curved portion 231b, and faces the magnet insertion hole 211 (specifically, the side 211a).

The side 211a defines the magnet insertion hole 211 and faces the side 231c.

The rotor core 21 may have one or more sides or curved portions that define the first end slit 2131 in addition to the first end slit side 231a, the first end slit curved portion 231b, and the side 231c.

FIG. 7 is an enlarged view showing a part of the structure of the rotor 2. Specifically, FIG. 7 is an enlarged view showing the structure of the region E2 surrounded by the broken line in FIG.
The rotor core 21 has a second end slit side 232a, a second end slit curved portion 232b, a side 232c (also referred to as a fourth end slit side), and a side 211b.

The second end slit side 232a defines the second end slit 2132 and faces the second flux barrier portion 2112.

The second end slit curved portion 232b defines the second end slit 2132, is adjacent to the second end slit side 232a, and is provided between the second end slit side 232a and the side 232c. It is located between the second end slit side 232a and the magnet insertion hole 211.

The side 232c defines the second end slit 2132, is adjacent to the second end slit curved portion 232b, and faces the magnet insertion hole 211 (specifically, the side 211b).

The side 211b defines the magnet insertion hole 211 and faces the side 232c.

The rotor core 21 may have one or more sides or curved portions that define the second end slit 2132, in addition to the second end slit side 232a, the second end slit curved portion 232b, and the side 232c.

In FIG. 6, in the rotor 2, the relationship between the distance d11 and the distance d12 satisfies d11 ≧ d12. In the example shown in FIG. 6, the relationship between the distance d11 and the distance d12 satisfies d11> d12.

The distance d11 is the distance from the boundary B1 to the point F1 (also referred to as the first point) on the plane orthogonal to the axial direction of the rotor 2. The point F1 is a point where the straight line L3 intersects the first end slit side 231a on a plane orthogonal to the axial direction of the rotor 2. The straight line L3 is a straight line orthogonal to the magnetic pole center line C1 and a straight line passing through the boundary B1 in a plane orthogonal to the axial direction of the rotor 2.

The distance d12 is the distance from the boundary B3 (also referred to as the third boundary) to the point F2 (also referred to as the second point) on the plane orthogonal to the axial direction of the rotor 2. The boundary B3 is a boundary between the first end slit side 231a and the first end slit curved portion 231b. The point F2 is a point where the straight line L4 intersects the first inner side 221a in a plane orthogonal to the axial direction of the rotor 2. The straight line L4 is a straight line orthogonal to the magnetic pole center line C1 and a straight line passing through the boundary B3 in a plane orthogonal to the axial direction of the rotor 2.

In FIG. 7, in the rotor 2, it is desirable that the relationship between the distance d21 and the distance d22 satisfies d21 ≧ d22. In the example shown in FIG. 7, the relationship between the distance d21 and the distance d22 satisfies d21> d22.

The distance d21 is a distance from the boundary B2 to the point F3 (also referred to as a third point) on a plane orthogonal to the axial direction of the rotor 2. The point F3 is a point where the straight line L5 intersects the second end slit side 232a in a plane orthogonal to the axial direction of the rotor 2. The straight line L5 is a straight line orthogonal to the magnetic pole center line C1 and a straight line passing through the boundary B2 in a plane orthogonal to the axial direction of the rotor 2.

The distance d22 is the distance from the boundary B4 (also referred to as the fourth boundary) to the point F4 (also referred to as the fourth point) on the plane orthogonal to the axial direction of the rotor 2. The boundary B4 is a boundary between the second end slit side 232a and the second end slit curved portion 232b. The point F4 is a point where the straight line L6 intersects the second inner side 222a in a plane orthogonal to the axial direction of the rotor 2. The straight line L6 is a straight line orthogonal to the magnetic pole center line C1 in a plane orthogonal to the axial direction of the rotor 2 and a straight line passing through the boundary B4.

FIG. 8 is a diagram showing the magnetic flux flowing from the stator 3 to the rotor 2.
When the motor 1 satisfies 251.7 ≦ P × θ ≦ 255, that is, 251.7 / P ≦ θ ≦ 255 / P, the magnetic flux from the stator 3 is transferred to the first end slit 2131 and the first flux barrier portion. Easy to pass between 2111. Thereby, the bending of the magnetic flux between the first end slit 2131 and the first flux barrier portion 2111 can be reduced. As a result, the cogging torque can be reduced.

Further, in the rotor 2, when the relationship between the distance d11 and the distance d12 satisfies d11> d12, the magnetic flux from the stator 3 passes between the first end slit 2131 and the first flux barrier portion 2111. Cheap. Thereby, the bending of the magnetic flux between the first end slit 2131 and the first flux barrier portion 2111 can be effectively reduced. As a result, the cogging torque can be effectively reduced.

FIG. 9 is a graph showing the relationship between the number of magnetic poles P × the angle θ of the motor 1 and the cogging torque generated in the motor 1.
As shown in FIG. 9, when the motor 1 satisfies 251.7 ≦ P × θ ≦ 255, that is, 251.7 / P ≦ θ ≦ 255 / P, the magnetic attraction generated in the motor 1 is suppressed and cogging. The torque can be reduced. As a result, vibration and noise in the motor 1 can be reduced.

When the motor 1 satisfies 251.7 ≦ P × θ ≦ 254.1, that is, 251.7 / P ≦ θ ≦ 254.1 / P, the cogging torque can be reduced to 0.1 [Nm] or less. .. As a result, the magnetic attraction force generated in the motor 1 is further suppressed, and the cogging torque can be further reduced. As a result, vibration and noise in the motor 1 can be further reduced.

When the motor 1 satisfies 253.3 = P × θ, that is, 253.3 / P = θ, the cogging torque is minimized. As a result, the magnetic attraction force generated in the motor 1 is further suppressed, and the cogging torque can be further reduced. As a result, vibration and noise in the motor 1 can be further reduced.

Modification example 1.
FIG. 10 is a diagram showing another example of the rotor 2. In FIG. 10, a part of the structure of the rotor 2 is shown.
FIG. 11 is an enlarged view showing a part of the structure of the rotor 2. Specifically, FIG. 11 is an enlarged view showing the structure of the region E1 surrounded by the broken line in FIG.
FIG. 12 is an enlarged view showing a part of the structure of the rotor 2. Specifically, FIG. 12 is an enlarged view showing the structure of the region E2 surrounded by the broken line in FIG.

The shape of the first end slit 2131 shown in FIG. 10 is different from the shape of each first end slit 2131 shown in FIG. 2, and the shape of the second end slit 2132 shown in FIG. 10 is shown in FIG. It is different from the shape of each second end slit 2132 shown in 2.

As shown in FIG. 11, in the rotor 2, the relationship between the distance d11 and the distance d12 satisfies d11 = d12. That is, the distance d11 is equal to the distance d12. In the example shown in FIG. 11, the first end slit side 231a is parallel to the magnetic pole center line C1 and the first inner side 221a.

In the example shown in FIG. 12, in the rotor 2, the relationship between the distance d21 and the distance d22 satisfies d21 = d22. That is, in the example shown in FIG. 12, the distance d21 is equal to the distance d22. In the example shown in FIG. 12, the second end slit side 232a is parallel to the magnetic pole center line C1 and the second inner side 222a.

Similar to the rotor 2 shown in FIG. 2, the rotor 2 shown in FIGS. 10 to 12 satisfies 251.7 / P ≦ θ ≦ 255 / P. The rotor 2 shown in FIGS. 10 to 12 has the characteristics of the cogging torque shown in FIG.

Since the rotor 2 shown in FIGS. 10 to 12 has the characteristics of the cogging torque shown in FIG. 9, the rotor 2 shown in FIGS. 10 to 12 has the same advantages as the rotor 2 shown in FIG.

FIG. 13 is a diagram showing the magnetic flux flowing from the stator 3 to the rotor 2 shown in FIG.
When the motor 1 satisfies 251.7 ≦ P × θ ≦ 255, that is, 251.7 / P ≦ θ ≦ 255 / P, the magnetic flux from the stator 3 is transferred to the first end slit 2131 and the first flux barrier portion. Easy to pass between 2111. Thereby, the bending of the magnetic flux between the first end slit 2131 and the first flux barrier portion 2111 can be reduced. As a result, the cogging torque can be reduced.

Further, in the rotor 2, the relationship between the distance d11 and the distance d12 is that when d11 = d12 is satisfied, the magnetic flux from the stator 3 passes between the first end slit 2131 and the first flux barrier portion 2111. Cheap. Thereby, the bending of the magnetic flux between the first end slit 2131 and the first flux barrier portion 2111 can be effectively reduced. As a result, the cogging torque can be effectively reduced.

Modification example 2.
FIG. 14 is a diagram showing another example of the rotor 2. FIG. 14 shows a partial structure of the rotor 2.
FIG. 15 is an enlarged view showing a part of the structure of the rotor 2. Specifically, FIG. 15 is an enlarged view showing the structure of the region E1 surrounded by the broken line in FIG.
FIG. 16 is an enlarged view showing a part of the structure of the rotor 2. Specifically, FIG. 16 is an enlarged view showing the structure of the region E2 surrounded by the broken line in FIG.

The shape of the first end slit 2131 shown in FIG. 14 is different from the shape of each of the first end slits 2131 shown in FIG. 2, and the shape of the second end slit 2132 shown in FIG. 14 is shown in FIG. It is different from the shape of each second end slit 2132 shown in 2.

As shown in FIG. 15, in the rotor 2, the relationship between the distance d11 and the distance d12 satisfies d11 = d12. That is, the distance d11 is equal to the distance d12. In the example shown in FIG. 15, the first end slit side 231a is parallel to the first inner side 221a.

The first end slit side 231a and the first inner side 221a are inclined toward the magnetic pole center line C1. For example, in a plane orthogonal to the axial direction of the rotor 2, the first end slit side 231a and the first inner side 221a are parallel to the lateral direction of the permanent magnet 22 facing the first end slit 2131. is there. In other words, in a plane orthogonal to the axial direction of the rotor 2, the first end slit side 231a and the first inner side 221a are relative to the longitudinal direction of the permanent magnet 22 facing the first end slit 2131. It is orthogonal.

In the example shown in FIG. 16, in the rotor 2, the relationship between the distance d21 and the distance d22 satisfies d21 = d22. That is, in the example shown in FIG. 16, the distance d21 is equal to the distance d22. In the example shown in FIG. 16, the second end slit side 232a is parallel to the second inner side 222a. The second end slit side 232a and the second inner side 222a are inclined toward the magnetic pole center line C1. For example, in a plane orthogonal to the axial direction of the rotor 2, the second end slit side 232a and the second inner side 222a are parallel to the lateral direction of the permanent magnet 22 facing the second end slit 2132. is there. In other words, in a plane orthogonal to the axial direction of the rotor 2, the second end slit side 232a and the second inner side 222a are relative to the longitudinal direction of the permanent magnet 22 facing the second end slit 2132. It is orthogonal.

Similar to the rotor 2 shown in FIG. 2, the rotor 2 shown in FIGS. 14 to 16 satisfies 251.7 / P ≦ θ ≦ 255 / P. The rotor 2 shown in FIGS. 14 to 16 has the characteristics of the cogging torque shown in FIG. Specifically, in the example shown in FIGS. 14 to 16, the rotor 2 satisfies θ = 253.3 / P.

Since the rotor 2 shown in FIGS. 14 to 16 has the characteristics of the cogging torque shown in FIG. 9, the rotor 2 shown in FIGS. 14 to 16 has the same advantages as the rotor 2 shown in FIG.

FIG. 17 is a diagram showing the magnetic flux flowing from the stator 3 to the rotor 2 shown in FIG.
When the motor 1 satisfies 251.7 ≦ P × θ ≦ 255, that is, 251.7 / P ≦ θ ≦ 255 / P, the magnetic flux from the stator 3 is transferred to the first end slit 2131 and the first flux barrier portion. Easy to pass between 2111. Thereby, the bending of the magnetic flux between the first end slit 2131 and the first flux barrier portion 2111 can be reduced. As a result, the cogging torque can be reduced.

When the first end slit side 231a is tilted toward the magnetic pole center line C1, the magnetic flux from the stator 3 easily passes between the first end slit 2131 and the first flux barrier portion 2111. Further, when both the first end slit side 231a and the first inner side 221a are tilted toward the magnetic pole center line C1, the magnetic flux from the stator 3 is the first end slit 2131 and the first flux. It easily passes between the barrier portion 2111.

In the example shown in FIG. 17, the angle between the direction of the magnetic flux from the stator 3 and the longitudinal direction of the permanent magnet 22 is a right angle or close to a right angle. For example, as compared with the example shown in FIG. 13, the angle between the direction of the magnetic flux from the stator 3 and the longitudinal direction of the permanent magnet 22 is closer to a right angle. Thereby, the bending of the magnetic flux between the first end slit 2131 and the first flux barrier portion 2111 can be effectively reduced. As a result, the cogging torque can be effectively reduced.

Modification example 3.
FIG. 18 is a diagram showing another example of the rotor 2. FIG. 18 shows a partial structure of the rotor 2.
FIG. 19 is an enlarged view showing a part of the structure of the rotor 2. Specifically, FIG. 19 is an enlarged view showing the structure of the region E1 surrounded by the broken line in FIG.
FIG. 20 is an enlarged view showing a part of the structure of the rotor 2. Specifically, FIG. 20 is an enlarged view showing the structure of the region E2 surrounded by the broken line in FIG.

The shape of the first end slit 2131 shown in FIG. 18 is different from the shape of each of the first end slits 2131 shown in FIG. 2, and the shape of the second end slit 2132 shown in FIG. 18 is shown in FIG. It is different from the shape of each second end slit 2132 shown in 2.

In FIG. 19, the distance d13 is the shortest distance from the first end slit 2131 to the first flux barrier portion 2111. In the example shown in FIG. 19, the distance d13 is the shortest distance from the first end slit side 231a to the first inner side 221a.

In the example shown in FIG. 19, the first end slit side 231a is parallel to the first inner side 221a. The first end slit side 231a and the first inner side 221a are inclined toward the magnetic pole center line C1. For example, in a plane orthogonal to the axial direction of the rotor 2, the first end slit side 231a and the first inner side 221a are parallel to the lateral direction of the permanent magnet 22 facing the first end slit 2131. is there.

In FIG. 20, the distance d23 is the shortest distance from the second end slit 2132 to the second flux barrier portion 2112. In the example shown in FIG. 20, the distance d23 is the shortest distance from the second end slit side 232a to the second inner side 222a.

In the example shown in FIG. 20, the second end slit side 232a is parallel to the second inner side 222a. The second end slit side 232a and the second inner side 222a are inclined toward the magnetic pole center line C1. For example, in a plane orthogonal to the axial direction of the rotor 2, the second end slit side 232a and the second inner side 222a are parallel to the lateral direction of the permanent magnet 22 facing the second end slit 2132. is there.

Similar to the rotor 2 shown in FIG. 2, the rotor 2 shown in FIGS. 18 to 20 satisfies 251.7 / P ≦ θ ≦ 255 / P. The rotor 2 shown in FIGS. 18 to 20 has the characteristics of the cogging torque shown in FIG.

Since the rotor 2 shown in FIGS. 18 to 20 has the characteristics of the cogging torque shown in FIG. 9, the rotor 2 shown in FIGS. 18 to 20 has the same advantages as the rotor 2 shown in FIG.

It is desirable that the minimum value of the distance d13 is equal to or greater than the thickness of each electromagnetic steel plate forming the rotor core 21. As a result, the first flux barrier portion 2111 and the first end slit 2131 can be easily formed by press working such as punching. In the present embodiment, the thickness of each electromagnetic steel plate forming the rotor core 21 is 0.365 [mm]. Therefore, the distance d13 is 0.365 [mm] or more.

It is desirable that the distance d13 is 0.55 [mm] or less. When the distance d13 exceeds 0.55 [mm], the magnetic flux passing between the first end slit 2131 and the first flux barrier portion 2111 spreads in multiple directions, and the first end slit 2131 and the first flux The bending of the magnetic flux with the barrier portion 2111 increases. As a result, the cogging torque increases.

FIG. 21 is a diagram showing the relationship between the distance d13 from the first end slit 2131 to the first flux barrier portion 2111 and the cogging torque generated in the motor 1.
As shown in FIG. 21, when the motor 1 satisfies 0.365 [mm] ≤ d13 ≤ 0.55 [mm], the first flux barrier portion 2111 and the first end slit 2131 are easily formed. It is possible to reduce the bending of the magnetic flux between the first end slit 2131 and the first flux barrier portion 2111. As a result, the cogging torque can be reduced, and the vibration and noise in the motor 1 can be reduced.

When the motor 1 satisfies 0.365 [mm] ≤ d13 ≤ 0.4 [mm], the cogging torque can be reduced to 0.1 [Nm] or less. As a result, the magnetic attraction force generated in the motor 1 is suppressed, and the cogging torque can be further reduced. As a result, vibration and noise in the motor 1 can be further reduced.

It is desirable that the minimum value of the distance D1 is equal to or greater than the thickness of each electromagnetic steel plate forming the rotor core 21. As a result, the first flux barrier portion 2111 and the magnet insertion hole 211 can be easily formed by press working such as punching. In the present embodiment, the thickness of each electromagnetic steel plate forming the rotor core 21 is 0.365 [mm]. Therefore, the distance D1 is 0.365 [mm] or more.

It is desirable that the distance D1 is 0.865 [mm] or less. When the distance D1 exceeds 0.865 [mm], the magnetic flux passing between the first end slit 2131 and the magnet insertion hole 211 spreads in multiple directions, and between the first end slit 2131 and the magnet insertion hole 211. The bending of the magnetic flux in As a result, the cogging torque increases.

Similarly, it is desirable that the minimum value of the distance D2 is equal to or greater than the thickness of each electrical steel sheet forming the rotor core 21. As a result, the second flux barrier portion 2112 and the magnet insertion hole 211 can be easily formed by press working such as punching. In the present embodiment, the thickness of each electromagnetic steel plate forming the rotor core 21 is 0.365 [mm]. Therefore, the distance D2 is 0.365 [mm] or more.

It is desirable that the distance D2 is 0.865 [mm] or less. When the distance D2 exceeds 0.865 [mm], the magnetic flux passing between the second end slit 2132 and the magnet insertion hole 211 spreads in multiple directions, and between the second end slit 2132 and the magnet insertion hole 211. The bending of the magnetic flux in As a result, the cogging torque increases.

FIG. 22 is a graph showing the relationship between the distance D1 from the first end slit 2131 to the magnet insertion hole 211 and the cogging torque generated in the motor 1.
As shown in FIG. 22, when the motor 1 satisfies 0.365 [mm] ≤ D1 ≤ 0.865 [mm], the first flux barrier portion 2111 and the magnet insertion hole 211 can be easily formed. , It is possible to reduce the bending of the magnetic flux between the first end slit 2131 and the magnet insertion hole 211. As a result, the cogging torque can be reduced, and the vibration and noise in the motor 1 can be reduced.

When the motor 1 satisfies 0.365 [mm] ≤ D1 ≤ 0.765 [mm], the cogging torque can be reduced to 0.1 [Nm] or less. As a result, the magnetic attraction force generated in the motor 1 is suppressed, and the cogging torque can be further reduced. As a result, vibration and noise in the motor 1 can be further reduced.

Similarly, when the motor 1 satisfies 0.365 [mm] ≤ D2 ≤ 0.865 [mm], the first flux barrier portion 2111 and the magnet insertion hole 211 can be easily formed, and the first end can be easily formed. It is possible to reduce the bending of the magnetic flux between the slit 2131 and the magnet insertion hole 211. As a result, the cogging torque can be reduced, and the vibration and noise in the motor 1 can be reduced.

When the motor 1 satisfies 0.365 [mm] ≤ D2 ≤ 0.765 [mm], the cogging torque generated in the motor 1 can be further reduced. As a result, vibration and noise in the motor 1 can be further reduced.

Embodiment 2.
The compressor 6 according to the second embodiment of the present invention will be described.
FIG. 23 is a cross-sectional view schematically showing the structure of the compressor 6 according to the second embodiment.

The compressor 6 has a motor 1 as an electric element, a closed container 61 as a housing, and a compression mechanism 62 as a compression element (also referred to as a compression device). In the present embodiment, the compressor 6 is a rotary compressor. However, the compressor 6 is not limited to the rotary compressor.

The motor 1 in the compressor 6 is the motor 1 described in the first embodiment. The motor 1 drives the compression mechanism 62.

The closed container 61 covers the motor 1 and the compression mechanism 62. The closed container 61 is a cylindrical container. Refrigerating machine oil that lubricates the sliding portion of the compression mechanism 62 is stored in the bottom of the closed container 61.

The compressor 6 further has a glass terminal 63 fixed to the closed container 61, an accumulator 64, a suction pipe 65, and a discharge pipe 66.

The compression mechanism 62 is attached to the cylinder 62a, the piston 62b, the upper frame 62c (also referred to as the first frame), the lower frame 62d (also referred to as the second frame), and the upper frame 62c and the lower frame 62d. It has a plurality of mufflers 62e. The compression mechanism 62 further has a vane that divides the inside of the cylinder 62a into a suction side and a compression side. The compression mechanism 62 is arranged in the closed container 61. The compression mechanism 62 is driven by the motor 1.

The motor 1 is fixed in the closed container 61 by press fitting or shrink fitting. The motor 1 may be directly attached to the closed container 61 by welding instead of press fitting and shrink fitting.

Electric power is supplied to the coil of the motor 1 (for example, the winding 32 described in the first embodiment) through the glass terminal 63.

The rotor 2 of the motor 1 (specifically, one side of the shaft 23) is rotatably supported by bearings provided on each of the upper frame 62c and the lower frame 62d.

A shaft 23 is inserted through the piston 62b. A shaft 23 is rotatably inserted into the upper frame 62c and the lower frame 62d. The upper frame 62c and the lower frame 62d close the end faces of the cylinder 62a. The accumulator 64 supplies a refrigerant (for example, a refrigerant gas) to the cylinder 62a through the suction pipe 65.

Next, the operation of the compressor 6 will be described. The refrigerant supplied from the accumulator 64 is sucked into the cylinder 62a from the suction pipe 65 fixed to the closed container 61. As the motor 1 rotates, the piston 62b fitted to the shaft 23 rotates in the cylinder 62a. As a result, the refrigerant is compressed in the cylinder 62a.

The compressed refrigerant passes through the muffler 62e and rises in the closed container 61. In this way, the compressed refrigerant is supplied to the high pressure side of the refrigeration cycle through the discharge pipe 66.

R410A, R407C, R22, or the like can be used as the refrigerant of the compressor 6. However, the refrigerant of the compressor 6 is not limited to these types. As the refrigerant of the compressor 6, a refrigerant having a small GWP (global warming potential), for example, the following refrigerant can be used.

(1) Halogenated hydrocarbons having a carbon double bond in the composition, for example, HFO (Hydro-Fluoro-Orefin) -1234yf (CF3CF = CH2) can be used. The GWP of HFO-1234yf is 4.
(2) 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.
(3) Using 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. May be good. Since the above-mentioned HFO-1234yf is a low-pressure refrigerant, the pressure loss tends to be large, which may lead to deterioration of the performance of the refrigeration cycle (particularly the evaporator). Therefore, it is practically desirable to use a mixture with R32 or R41, which is a higher pressure refrigerant than HFO-1234yf.

The compressor 6 according to the second embodiment has the advantages described in the first embodiment.

Further, since the compressor 6 according to the second embodiment has the motor 1 according to the first embodiment, vibration and noise in the compressor 6 can be reduced.

Embodiment 3.
The refrigerating and air-conditioning apparatus 7 as an air conditioner having the compressor 6 according to the second embodiment will be described.
FIG. 24 is a diagram schematically showing the configuration of the refrigeration and air conditioner 7 according to the third embodiment of the present invention.

The refrigerating and air-conditioning device 7 can be operated for heating and cooling, for example. The refrigerant circuit diagram shown in FIG. 24 is an example of a refrigerant circuit diagram of an air conditioner capable of cooling operation.

The refrigerating and air-conditioning device 7 according to the third embodiment has an outdoor unit 71, an indoor unit 72, and a refrigerant pipe 73 connecting the outdoor unit 71 and the indoor unit 72.

The outdoor unit 71 includes a compressor 6, a condenser 74 as a heat exchanger, a throttle device 75, and an outdoor blower 76 (first blower). The condenser 74 condenses the refrigerant compressed by the compressor 6. The throttle device 75 decompresses the refrigerant condensed by the condenser 74 and adjusts the flow rate of the refrigerant. The diaphragm device 75 is also called a decompression device.

The indoor unit 72 has an evaporator 77 as a heat exchanger and an indoor blower 78 (second blower). The evaporator 77 evaporates the refrigerant decompressed by the throttle device 75 to cool the indoor air.

The basic operation of the cooling operation in the refrigerating air conditioner 7 will be described below. In the cooling operation, the refrigerant is compressed by the compressor 6 and flows into the condenser 74. The refrigerant is condensed by the condenser 74, and the condensed refrigerant flows into the drawing device 75. The refrigerant is decompressed by the throttle device 75, and the decompressed refrigerant flows into the evaporator 77. The refrigerant evaporates in the evaporator 77, and the refrigerant (specifically, the refrigerant gas) flows into the compressor 6 of the outdoor unit 71 again. Similarly, when air is sent to the condenser 74 by the outdoor blower 76, heat is transferred between the refrigerant and air, and similarly, when air is sent to the evaporator 77 by the indoor blower 78, heat is transferred between the refrigerant and air. Moving.

The configuration and operation of the refrigerating air conditioner 7 described above is an example, and is not limited to the above-mentioned example.

According to the refrigerating air conditioner 7 according to the third embodiment, it has the advantages described in the first and second embodiments.

Further, since the refrigerating and air-conditioning device 7 according to the third embodiment has the compressor 6 according to the second embodiment, vibration and noise in the refrigerating and air-conditioning device 7 can be reduced.

As described above, the preferred embodiments have been specifically described, but it is obvious that those skilled in the art can adopt various modifications based on the basic technical idea and teaching of the present invention. ..

The features in each embodiment and the features in each modification described above can be appropriately combined with each other.

1 motor, 2 rotor, 3 stator, 4 motor frame, 6 compressor, 7 refrigeration and air conditioning device, 21 rotor core, 22 permanent magnets, 23 shafts, 32 windings, 33 slots, 61 sealed containers, 211 magnet insertion holes, 212 shafts Hole, 213 end slit, 214 inner slit, 221a first inner side, 221b first outer curved part, 221c first outer side, 222a second inner side, 222b second outer curved part, 222c second Outer side, 2110 magnet arrangement part, 2111 first flux barrier part, 2112 second flux barrier part, 2131 first end slit, 2132 second end slit.

Claims (16)

1. A rotor with P magnetic poles (P is an integer of 2 or more).
   With permanent magnets
   A magnet insertion hole having a magnet arrangement portion in which the permanent magnet is arranged, a first flux barrier portion communicating with the magnet arrangement portion, and a second flux barrier portion communicating with the magnet arrangement portion. A first end slit located between the first flux barrier portion and the second flux barrier portion and facing the first flux barrier portion, the first flux barrier portion, and the first flux barrier portion. A rotor core located between the two flux barrier portions and having a second end slit facing the second flux barrier portion is provided.
   The rotor core
   The first inner side that defines the first flux barrier portion and faces the first end slit, and
   A first outer curvature that defines the first flux barrier, is adjacent to the first inner edge, and is located between the first inner edge and the outer peripheral surface of the rotor core. Department and
   A second inner side that defines the second flux barrier portion and faces the second end slit, and
   A second outer curvature that defines the second flux barrier, is adjacent to the second inner edge, and is located between the second inner edge and the outer peripheral surface of the rotor core. Has a part and
   In a plane orthogonal to the axial direction of the rotor, a straight line passing through the first boundary between the first inner side and the first outer curved portion and the rotation center of the rotor is defined as L1, and the second The straight line passing through the second boundary between the inner side and the second outer curved portion and the rotation center of the rotor is L2, and the angle between the straight line L1 and the straight line L2 is θ [degree]. When you do
   251.7 / P ≤ θ ≤ 255 / P
   Rotor that meets.
2. A rotor with P magnetic poles (P is an integer of 2 or more).
   With permanent magnets
   A magnet insertion hole having a magnet arrangement portion in which the permanent magnet is arranged, a first flux barrier portion communicating with the magnet arrangement portion, and a second flux barrier portion communicating with the magnet arrangement portion. A first end slit located between the first flux barrier portion and the second flux barrier portion and facing the first flux barrier portion, the first flux barrier portion, and the first flux barrier portion. A rotor core located between the two flux barrier portions and having a second end slit facing the second flux barrier portion is provided.
   The rotor core
   The first inner side that defines the first flux barrier portion and faces the first end slit, and
   A first outer curvature that defines the first flux barrier, is adjacent to the first inner edge, and is located between the first inner edge and the outer peripheral surface of the rotor core. Department and
   A second inner side that defines the second flux barrier portion and faces the second end slit, and
   A second outer curvature that defines the second flux barrier, is adjacent to the second inner edge, and is located between the second inner edge and the outer peripheral surface of the rotor core. Has a part and
   When the shortest distance from the first end slit to the magnet insertion hole is D1 [mm],
   0.365 ≤ D1 ≤ 0.865
   Rotor that meets.
3. In a plane orthogonal to the axial direction of the rotor, a straight line passing through the first boundary between the first inner side and the first outer curved portion and the rotation center of the rotor is defined as L1, and the second The straight line passing through the second boundary between the inner side and the second outer curved portion and the rotation center of the rotor is L2, and the angle between the straight line L1 and the straight line L2 is θ [degree]. When you do
   251.7 / P ≤ θ ≤ 255 / P
   The rotor according to claim 2.
4. The rotor according to claim 2 or 3, which satisfies 0.365 ≤ D1 ≤ 0.765.
5. When the shortest distance from the second end slit to the magnet insertion hole is D2 [mm],
   0.365 ≤ D2 ≤ 0.865
   The rotor according to any one of claims 2 to 4.
6. When the shortest distance from the second end slit to the magnet insertion hole is D2 [mm],
   The rotor according to any one of claims 2 to 4, which satisfies 0.365 ≦ D2 ≦ 0.765.
7. The rotor core
   The first end slit side that defines the first end slit and faces the first flux barrier portion, and the first end slit side.
   The first end slit that defines the first end slit, is adjacent to the first end slit side, and is located between the first end slit side and the magnet insertion hole. Has a curved part and
   In a plane orthogonal to the axial direction of the rotor, a straight line orthogonal to the magnetic pole center line passing through the magnetic pole center of the rotor defines a first boundary between the first inner side and the first outer curved portion. The point that passes through and intersects the first end slit side is defined as the first point, the distance from the first boundary to the first point is d11, and the first end slit side and the first end are defined as d11. The boundary between the slit curved portion is defined as a third boundary, and the point at which a straight line orthogonal to the magnetic pole center line passes through the third boundary and intersects with the first inner edge is defined as a second point. When the distance from the third boundary to the second point is d12,
   d11 ≧ d12
   The rotor according to any one of claims 1 to 6.
8. The rotor core
   The second end slit side that defines the second end slit and faces the second flux barrier portion, and the second end slit side.
   A second end slit that defines the second end slit, is adjacent to the second end slit side, and is located between the second end slit side and the magnet insertion hole. Has a curved part and
   In the plane orthogonal to the axial direction of the rotor, a straight line orthogonal to the magnetic pole centerline passes through a second boundary between the second inner side and the second outer curved portion and said the first. The point where the end slit side of 2 intersects is set as the third point, the distance from the second boundary to the third point is set to d21, and the second end slit side and the second end slit curved portion The boundary between the two is defined as the fourth boundary, the point at which the straight line orthogonal to the magnetic pole center line passes through the fourth boundary and intersects with the second inner edge is defined as the fourth point, and the fourth boundary is defined as the fourth boundary. When the distance from the fourth point to the fourth point is d22,
   d21 ≧ d22
   The rotor according to claim 7.
9. d11 = d12
   The rotor according to claim 7 or 8.
10. When the shortest distance from the first end slit to the first flux barrier portion is d13 [mm],
    0.365 ≤ d13 ≤ 0.55
    The rotor according to claim 9.
11. When the shortest distance from the first end slit to the first flux barrier portion is d13 [mm],
    0.365 ≤ d13 ≤ 0.4
    The rotor according to claim 9.
12. The rotor according to any one of claims 1 to 11, which satisfies θ = 253.3 / P.
13. With the stator
    A motor including the rotor according to any one of claims 1 to 12, which is arranged inside the stator.
14. The motor according to claim 13, which is driven by inverter control.
15. With a closed container
    With the compression device arranged in the closed container,
    A compressor including the motor according to claim 13 or 14, which drives the compressor.
16. The compressor according to claim 15 and
    An air conditioner equipped with a heat exchanger.

Images