JP7204897B2 - Rotors, motors, compressors, and air conditioners - Google Patents

Description

The present invention relates to motor rotors.

Rotors having rotor cores with flux barriers and slits are generally known. In this rotor, the flux barrier reduces leakage flux and the slits regulate the amount of flux passing through the rotor (see, for example, US Pat.

JP 2012-217250 A

However, in 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 a flux barrier or slit, bending of the magnetic flux occurs. Increased flux bending leads to increased cogging torque. As the cogging torque increases, torque ripple increases during motor driving, resulting in increased vibration and noise in the motor.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems and reduce vibration and noise in a motor.

A rotor according to one aspect of the present invention includes:
A rotor having P magnetic poles (P is an integer of 2 or more),
a permanent magnet and
a magnet insertion hole having a magnet placement portion in which the permanent magnet is arranged, a first flux barrier portion communicating with the magnet placement portion, and a second flux barrier portion communicating with the magnet placement portion; a first end slit positioned between the first flux barrier portion and the second flux barrier portion and facing the first flux barrier portion; a rotor core having a second end slit positioned between two flux barrier sections and facing the second flux barrier section;
The magnet insertion hole has a V shape on a plane perpendicular to the axial direction of the rotor,
The rotor core is
a first inner side defining the first flux barrier portion and facing the first end slit;
a first outer curvature defining the first flux barrier portion and adjacent to the first inner side and located between the first inner side and an outer peripheral surface of the rotor core; Department and
a second inner side defining the second flux barrier portion and facing the second end slit;
a second outer curvature defining the second flux barrier portion and adjacent to the second inner side and located between the second inner side and an outer peripheral surface of the rotor core; and
In the plane orthogonal to the axial direction of the rotor, a straight line passing through a first boundary between the first inner side and the first outer curved portion and the center of rotation of the rotor is defined as L1, and the second Let L2 be a straight line passing through the second boundary between the inner side of and the second outer curved portion and the center of rotation of the rotor, and the angle between the straight line L1 and the straight line L2 be θ [degrees] When
251.7/P≤θ≤255/P
satisfy the
The rotor core is
a first end slit side defining the first end slit and facing the first flux barrier portion;
a first end slit defining the first end slit, adjacent to the first end slit side, and located between the first end slit side and the magnet insert hole; curved part and
has
In the plane perpendicular to the axial direction of the rotor, a straight line passing through the magnetic pole center of the rotor and perpendicular to the magnetic pole center line is a first boundary between the first inner side and the first outer curved portion. and intersecting the first end slit side is defined as a first point, the distance from the first boundary to the first point is defined as d11, and the first end slit side and the first end slit side A third boundary is a boundary between the end slit curved portion, and a second point is a point at which a straight line perpendicular to the magnetic pole center line passes through the third boundary and intersects the first inner side, When the distance from the third boundary to the second point is d12,
d11≧d12
meet .
A rotor according to another aspect of the present invention includes:
A rotor having P magnetic poles (P is an integer of 2 or more),
a permanent magnet and
a magnet insertion hole having a magnet placement portion in which the permanent magnet is arranged, a first flux barrier portion communicating with the magnet placement portion, and a second flux barrier portion communicating with the magnet placement portion; a first end slit positioned between the first flux barrier portion and the second flux barrier portion and facing the first flux barrier portion; a rotor core having a second end slit positioned between two flux barrier sections and facing the second flux barrier section;
The magnet insertion hole has a V shape on a plane perpendicular to the axial direction of the rotor,
The rotor core is
a first inner side defining the first flux barrier portion and facing the first end slit;
a first outer curvature defining the first flux barrier portion and adjacent to the first inner side and located between the first inner side and an outer peripheral surface of the rotor core; Department and
a second inner side defining the second flux barrier portion and facing the second end slit;
a second outer curvature defining the second flux barrier portion and adjacent to the second inner side and located between the second inner side and an outer peripheral surface of the rotor core; and
When the shortest distance from the first end slit to the magnet insertion hole is D1 [mm],
0.365≤D1≤0.865
satisfy the
The rotor core is
a first end slit side defining the first end slit and facing the first flux barrier portion;
a first end slit defining the first end slit, adjacent to the first end slit side, and located between the first end slit side and the magnet insert hole; curved part and
has
In the plane perpendicular to the axial direction of the rotor, a straight line passing through the magnetic pole center of the rotor and perpendicular to the magnetic pole center line is a first boundary between the first inner side and the first outer curved portion. and intersecting the first end slit side is defined as a first point, the distance from the first boundary to the first point is defined as d11, and the first end slit side and the first end slit side A third boundary is a boundary between the end slit curved portion, and a second point is a point at which a straight line perpendicular to the magnetic pole center line passes through the third boundary and intersects the first inner side, When the distance from the third boundary to the second point is d12,
d11≧d12
meet .
A motor according to another aspect of the present invention includes:
a stator;
The rotor according to the aspect of the present invention or the rotor according to the other aspect of the present invention, arranged inside the stator.
A compressor according to another aspect of the present invention comprises:
a closed container;
a compression device disposed within the closed vessel;
and the motor that drives the compression device.
An air conditioner according to another aspect of the present invention includes
the compressor;
and a heat exchanger.

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

1 is a cross-sectional view schematically showing the structure of a motor according to Embodiment 1 of the present invention; FIG. It is a top view which shows the structure of a rotor. 3 is an enlarged view showing the structure of part of the rotor shown in FIG. 2; FIG. 4 is an enlarged view showing the structure of part of the rotor; FIG. 4 is an enlarged view showing the structure of part of the rotor; FIG. 4 is an enlarged view showing the structure of part of the rotor; FIG. 4 is an enlarged view showing the structure of part of the rotor; FIG. FIG. 4 is a diagram showing magnetic flux flowing from a stator to a rotor; 4 is a graph showing cogging torque generated in a motor; FIG. 4 is a diagram showing another example of a rotor; 4 is an enlarged view showing the structure of part of the rotor; FIG. 4 is an enlarged view showing the structure of part of the rotor; FIG. Figure 12 shows the magnetic flux flowing from the stator into the rotor shown in Figure 11; FIG. 4 is a diagram showing another example of a rotor; 4 is an enlarged view showing the structure of part of the rotor; FIG. 4 is an enlarged view showing the structure of part of the rotor; FIG. Figure 16 shows the magnetic flux flowing from the stator into the rotor shown in Figure 15; FIG. 4 is a diagram showing another example of a rotor; 4 is an enlarged view showing the structure of part of the rotor; FIG. 4 is an enlarged view showing the structure of part of the rotor; FIG. 5 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; 5 is a graph showing the relationship between the distance from the first end slit to the magnet insertion hole and the cogging torque generated in the motor; FIG. 6 is a cross-sectional view schematically showing the structure of a compressor according to Embodiment 2 of the present invention; FIG. 3 is a diagram schematically showing the configuration of a refrigerating and air-conditioning apparatus according to Embodiment 3 of the present invention;

Embodiment 1.
In the xyz orthogonal 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 "the axial direction of the rotor 2" or simply "the axial direction". A radial direction is a radial direction of the rotor 2 or the stator 3 and is a direction perpendicular to the axis Ax. The xy plane is a plane perpendicular to the axial direction. An arrow A1 indicates a circumferential direction about the axis Ax. The circumferential direction of the rotor 2 or stator 3 is also simply referred to as "circumferential direction".

FIG. 1 is a sectional view schematically showing the structure of motor 1 according to Embodiment 1 of the present invention.
A motor 1 has a rotor 2 having P magnetic poles (P is an integer equal to or greater than 2) and a stator 3 . The motor 1 is, for example, a permanent magnet synchronous motor (also called a brushless DC motor) such as a permanent magnet embedded electric motor. The motor 1 may further have a motor frame 4 (also simply called “frame”) covering the stator 3 .

The motor 1 is driven by inverter control, for example. This enables motor control in consideration of the cogging torque generated in the motor 1 . As a result, it is possible to suppress fluctuations in torque ripple that occur during driving of the motor 1, and to reduce vibration and noise in the motor 1. FIG.

FIG. 2 is a plan view showing the structure of the rotor 2. FIG.
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 this embodiment, the rotor 2 is a permanent magnet embedded rotor.

An air gap exists between the rotor 2 (specifically, the outer peripheral surface 21 a of the rotor core 21 ) and the stator 3 . The air gap between rotor 2 and stator 3 is, for example, 0.3 mm to 1 mm. When a current having a frequency synchronized with the commanded rotational speed is supplied to the windings 32 of the stator 3, a rotating magnetic field is generated in the stator 3, causing the rotor 2 to rotate.

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. Stator core 31 has an annular yoke 311 and a plurality of teeth 312 . In the example shown in FIG. 1 , stator core 31 has nine teeth 312 and nine slots 33 . Each slot 33 is a space between adjacent teeth 312 .

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

A plurality of teeth 312 are radially positioned. In other words, the plurality of teeth 312 are arranged at regular 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 radially extending main body portion and a tooth distal end portion located at the distal end 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 regular 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 magnetic steel sheets laminated in the axial direction. These electromagnetic steel sheets are fixed to each other by caulking. Each of the plurality of electromagnetic steel sheets is punched to have a predetermined shape. Each thickness of the plurality of electromagnetic steel sheets is, for example, 0.1 mm to 0.7 mm. In this 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 , so that each slot 33 is provided with a winding 32 . For example, the winding 32 is wound around each tooth 312 by concentrated winding. An insulator is preferably arranged between the winding 32 and each tooth 312 .

Winding 32 forms a coil that generates a rotating magnetic field. The coil is, for example, a 3-phase coil. In this case, the connection system is, for example, Y connection. The winding 32 is, for example, a magnet wire with a diameter of 1 mm. When current flows through winding 32, a rotating magnetic field is generated. The number of turns and diameter of the winding 32 are set according to the voltage applied to the winding 32, the number of rotations of the motor 1, the cross-sectional area of the slot 33, and the like. The number of turns of the winding 32 is 80, for example.

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

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

Each magnetic pole center 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 an area that serves as an N pole or an S pole of the rotor 2 .

Each interpolar portion is a boundary between two magnetic poles (that is, the N pole and S pole of the rotor 2) that are adjacent in the circumferential direction.

The rotor core 21 has a plurality of magnetic steel sheets laminated in the axial direction. These electromagnetic steel sheets are fixed to each other by caulking. Each of the plurality of electromagnetic steel sheets is punched to have a predetermined shape. Each thickness of the plurality of electromagnetic 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, 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 two or more. The range of pole numbers P is preferably an even number from 4 to 10, ie 4, 6, 8, or 10.

Each magnet insertion hole 211 corresponds to each magnetic pole of the rotor 2 . Therefore, in this embodiment, the rotor 2 has six magnetic 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, each magnet insertion hole 211 has a V shape in the xy plane. The shape of each magnet insertion hole 211 is not limited to a V shape, and may be, for example, a straight shape.

In this embodiment, two permanent magnets 22 are arranged in one magnet insertion hole 211 . That is, two permanent magnets 22 inside one magnet insertion hole 211 form one magnetic pole of the rotor 2 . A set of permanent magnets 22 is arranged in one magnet insertion hole 211 so as to have a V shape in the xy plane. 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 plate-shaped magnet elongated 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, each permanent magnet 22 is magnetized in the lateral direction of each permanent magnet 22 in the xy plane. Each permanent magnet 22 is a rare earth magnet including, for example, neodymium (Nd), iron (Fe), and boron (B).

The N poles or S poles of the two permanent magnets 22 arranged in one magnet insertion hole 211 face radially outward or inward of the rotor 2 . Accordingly, a set of permanent magnets 22 (specifically, two permanent magnets 22 ) arranged in one magnet insertion hole 211 serves as one magnetic pole of the rotor 2 . That is, in one magnetic pole of the rotor 2 , a set of permanent magnets 22 (specifically, two permanent magnets 22 ) functions as an N pole or an S pole with respect to the stator 3 .

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

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

A first flux barrier portion 2111 and a second flux barrier portion 2112 are positioned on both sides of the magnet insertion hole 211 in the xy plane. That is, the magnet arrangement portion 2110 is positioned 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 through the rotor 2 in the axial direction. Thereby, the first flux barrier section 2111 reduces leakage magnetic flux. Similarly, the second flux barrier portion 2112 is a through hole penetrating through the rotor 2 in the axial direction. Thereby, the second flux barrier section 2112 reduces leakage magnetic flux.

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

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 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 . Thereby, each end slit 213 adjusts the direction of the magnetic flux in the rotor 2 .

The plurality of edge slits 213 includes at least one first edge slit 2131 and at least one second edge slit 2132 . 2 and 3, in each magnetic pole of the rotor 2, one first end slit 2131 and one second end slit 2132 are provided between each magnet insertion hole 211 and the outer peripheral surface 21a of the rotor core 21. placed in between.

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

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

FIG. 5 is an enlarged view showing the structure of part of the rotor 2. As shown in FIG. Specifically, FIG. 5 is an enlarged view showing the structure of the region E2 enclosed by the dashed 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 the second slit among the plurality of slits (that is, the end slits 213 and the plurality of inner slits 214) provided between the first flux barrier portion 2111 and the second flux barrier portion 2112. is the slit closest to the flux barrier portion 2112 of .

A portion of the rotor core 21 existing outside the first flux barrier portion 2111 in the radial direction, that is, a region between the outer peripheral surface 21a of the rotor core 21 and the first flux barrier portion 2111 is thin to reduce leakage magnetic flux. Department. The width of this thin portion in the radial direction is, for example, equal to or greater 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 be, for example, the same width as the thickness of each electromagnetic steel plate of the rotor core 21 . As a result, an increase in leakage magnetic flux can be effectively suppressed.

Similarly, a portion of the rotor core 21 existing outside the second flux barrier portion 2112 in the radial direction, that is, a region between the outer peripheral surface 21a of the rotor core 21 and the second flux barrier portion 2112, leaks magnetic flux. It is a thin portion that reduces. The width of this thin portion in the radial direction is, for example, equal to or greater 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 be, for example, the same width as the thickness of each electromagnetic steel plate of the rotor core 21 . As a result, an increase in leakage magnetic flux can be effectively suppressed.

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

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

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

A 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 curved portion 221c. good too.

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

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

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

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

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

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

Boundaries B1 and B2 are symmetrical about the pole centerline C1.

FIG. 6 is an enlarged view showing the structure of part of the rotor 2. As shown in FIG. Specifically, FIG. 6 is an enlarged view showing the structure of the region E1 enclosed by the dashed 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 231 a defines the first end slit 2131 and faces the first flux barrier portion 2111 .

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

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

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

Rotor core 21 may have one or more sides or curves that define first end slit 2131 in addition to first end slit side 231a, first end slit curve 231b, and side 231c.

FIG. 7 is an enlarged view showing the structure of part of the rotor 2. As shown in FIG. Specifically, FIG. 7 is an enlarged view showing the structure of the region E2 surrounded by the dashed 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 232 a defines a second end slit 2132 and faces the second flux barrier portion 2112 .

A second end slit curve 232b defines a second end slit 2132, is adjacent to the second end slit side 232a, and is disposed between the second end slit sides 232a and 232c. and located between the second end slit side 232 a and the magnet insertion hole 211 .

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

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

Rotor core 21 may have one or more sides or curves that define second end slit 2132 in addition to second end slit side 232a, second end slit curve 232b, and side 232c.

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

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

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

In FIG. 7, in the rotor 2, the relationship between the distances d21 and d22 preferably satisfies d21≧d22. In the example shown in FIG. 7, the relationship between the distances d21 and d22 satisfies d21>d22.

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

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

FIG. 8 is a diagram showing magnetic flux flowing from the stator 3 to the rotor 2. As 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 passes through the first end slit 2131 and the first flux barrier section. Easy to pass between 2111. Thereby, bending of the magnetic flux between the first end slit 2131 and the first flux barrier portion 2111 can be reduced. As a result, cogging torque can be reduced.

Furthermore, 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. This can effectively reduce bending of the magnetic flux between the first end slit 2131 and the first flux barrier portion 2111 . As a result, 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 attractive force generated in the motor 1 is suppressed and the cogging is suppressed. 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.

The cogging torque is minimized when the motor 1 satisfies 253.3=P×θ, that is, 253.3/P=θ. 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 1.
FIG. 10 is a diagram showing another example of the rotor 2. FIG. In FIG. 10, the structure of part of the rotor 2 is shown.
FIG. 11 is an enlarged view showing the structure of part of the rotor 2. As shown in FIG. Specifically, FIG. 11 is an enlarged view showing the structure of the region E1 enclosed by the dashed line in FIG.
FIG. 12 is an enlarged view showing the structure of part of the rotor 2. As shown in FIG. Specifically, FIG. 12 is an enlarged view showing the structure of the region E2 enclosed by the dashed line in FIG.

The shape of the first end slits 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 slits 2132 shown in FIG. 2 is different from the shape of each second end slit 2132 shown in FIG.

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

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

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

The rotor 2 shown in FIGS. 10-12 has the cogging torque characteristics shown in FIG. 9, so the rotor 2 shown in FIGS. 10-12 has the same advantages as the rotor 2 shown in FIG.

FIG. 13 is a diagram showing 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 passes through the first end slit 2131 and the first flux barrier section. Easy to pass between 2111. Thereby, bending of the magnetic flux between the first end slit 2131 and the first flux barrier portion 2111 can be reduced. As a result, cogging torque can be reduced.

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

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

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

As shown in FIG. 15, in the rotor 2, the relationship between the distances d11 and d12 satisfies d11=d12. That is, distance d11 is equal to 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 centerline 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 short direction of the permanent magnet 22 facing the first end slit 2131. be. In other words, on a plane orthogonal to the axial direction of the rotor 2 , the first end slit side 231 a and the first inner side 221 a are aligned with respect to the longitudinal direction of the permanent magnet 22 facing the first end slit 2131 . are orthogonal.

In the example shown in FIG. 16, in the rotor 2, the relationship between the distances d21 and d22 satisfies d21=d22. That is, in the example shown in FIG. 16, distance d21 is equal to 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 centerline C1. For example, in a plane orthogonal to the axial direction of the rotor 2 , the second end slit side 232 a and the second inner side 222 a are parallel to the short direction of the permanent magnet 22 facing the second end slit 2132 . be. In other words, on a plane orthogonal to the axial direction of the rotor 2, the second end slit side 232a and the second inner side 222a are arranged in the longitudinal direction of the permanent magnet 22 facing the second end slit 2132. are orthogonal.

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

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

FIG. 17 is a diagram showing 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 passes through the first end slit 2131 and the first flux barrier section. Easy to pass between 2111. Thereby, bending of the magnetic flux between the first end slit 2131 and the first flux barrier portion 2111 can be reduced. As a result, cogging torque can be reduced.

When the first end slit side 231 a is inclined toward the magnetic pole center line C<b>1 , the magnetic flux from the stator 3 easily passes between the first end slit 2131 and the first flux barrier portion 2111 . Furthermore, when both the first end slit side 231a and the first inner side 221a are inclined toward the magnetic pole centerline C1, the magnetic flux from the stator 3 is distributed between the first end slit 2131 and the first flux It is easy to pass between the barrier section 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, compared to 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 approaches a right angle. This can effectively reduce bending of the magnetic flux between the first end slit 2131 and the first flux barrier portion 2111 . As a result, cogging torque can be effectively reduced.

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

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

In FIG. 19, the distance d13 is the shortest distance from the first end slit 2131 to the first flux barrier portion 2111. In FIG. 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 centerline 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 short direction of the permanent magnet 22 facing the first end slit 2131. be.

In FIG. 20, the distance d23 is the shortest distance from the second end slit 2132 to the second flux barrier section 2112. In FIG. 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 centerline C1. For example, in a plane orthogonal to the axial direction of the rotor 2 , the second end slit side 232 a and the second inner side 222 a are parallel to the short direction of the permanent magnet 22 facing the second end slit 2132 . be.

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

The rotor 2 shown in FIGS. 18-20 has the cogging torque characteristics shown in FIG. 9, so the rotor 2 shown in FIGS. 18-20 has the same advantages as the rotor 2 shown in FIG.

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

The distance d13 is desirably 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 barrier portion 2111 spread in multiple directions. The bending of the magnetic flux with the barrier part 2111 increases. As a result, 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.
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 can be easily formed. , and bending of the magnetic flux between the first end slit 2131 and the first flux barrier portion 2111 can be reduced. As a result, cogging torque can be reduced, and 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 distance D1 be equal to or greater than the thickness of each electromagnetic steel sheet forming rotor core 21 . Accordingly, the first flux barrier portion 2111 and the magnet insertion hole 211 can be easily formed by press work such as punching. In the present embodiment, the thickness of each electromagnetic steel sheet forming rotor core 21 is 0.365 [mm]. Therefore, the distance D1 is 0.365 [mm] or more.

The distance D1 is desirably 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 the magnetic flux between the first end slit 2131 and the magnet insertion hole 211 spreads. The bending of the magnetic flux at increases. As a result, 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 electromagnetic steel sheet forming the rotor core 21. Thereby, 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 sheet forming rotor core 21 is 0.365 [mm]. Therefore, the distance D2 is 0.365 [mm] or more.

The distance D2 is desirably 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 the magnetic flux between the second end slit 2132 and the magnet insertion hole 211 spreads. The bending of the magnetic flux at increases. As a result, cogging torque increases.

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. FIG.
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. , the bending of the magnetic flux between the first end slit 2131 and the magnet insertion hole 211 can be reduced. As a result, cogging torque can be reduced, and 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 Bending of the magnetic flux between the slit 2131 and the magnet insertion hole 211 can be reduced. As a result, cogging torque can be reduced, and 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.
A compressor 6 according to Embodiment 2 of the present invention will be described.
FIG. 23 is a cross-sectional view schematically showing the structure of 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 this embodiment, the compressor 6 is a rotary compressor. However, the compressor 6 is not limited to a rotary compressor.

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

The closed container 61 covers the motor 1 and the compression mechanism 62 . The sealed container 61 is a cylindrical container. Refrigerating machine oil that lubricates sliding portions of the compression mechanism 62 is stored in the bottom portion of the sealed 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 a cylinder 62a, a piston 62b, an upper frame 62c (also referred to as a first frame), a lower frame 62d (also referred to as a second frame), an upper frame 62c and a 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 inside the closed container 61 . Compression mechanism 62 is driven by motor 1 .

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

Electric power is supplied to the coils of the motor 1 (for example, the windings 32 described in the first embodiment) through the glass terminals 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.

The shaft 23 is inserted through the piston 62b. A shaft 23 is rotatably inserted through the upper frame 62c and the lower frame 62d. The upper frame 62c and the lower frame 62d close the end face of the cylinder 62a. The accumulator 64 supplies refrigerant (eg, refrigerant gas) to the cylinder 62a through a suction pipe 65. As shown in FIG.

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

The compressed refrigerant rises inside the sealed container 61 through the muffler 62e. Compressed refrigerant is thus supplied through the discharge pipe 66 to the high pressure side of the refrigeration cycle.

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

(1) A halogenated hydrocarbon having a carbon double bond in its composition, such as HFO (Hydro-Fluoro-Orefin)-1234yf (CF3CF=CH2) can be used. HFO-1234yf has a GWP of 4.
(2) Hydrocarbons having carbon double bonds in their composition, such as R1270 (propylene) may be used. R1270 has a GWP of 3, which is lower than HFO-1234yf, but more flammable than HFO-1234yf.
(3) Using a mixture containing at least either a halogenated hydrocarbon having a carbon double bond in its composition or a hydrocarbon having a carbon double bond in its composition, such as a mixture of HFO-1234yf and R32 good too. Since HFO-1234yf described above is a low-pressure refrigerant, pressure loss tends to increase, which may lead to deterioration in 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 explained in the first embodiment.

Furthermore, since the compressor 6 according to Embodiment 2 has the motor 1 according to Embodiment 1, vibration and noise in the compressor 6 can be reduced.

Embodiment 3.
A refrigerating and air-conditioning apparatus 7 as an air conditioner having a compressor 6 according to Embodiment 2 will be described.
FIG. 24 is a diagram schematically showing the configuration of a refrigerating and air-conditioning device 7 according to Embodiment 3 of the present invention.

The refrigerating and air-conditioning device 7 is capable of cooling and heating operation, 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.

A refrigerating and air-conditioning apparatus 7 according to Embodiment 3 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 has a compressor 6, a condenser 74 as a heat exchanger, an expansion device 75, and an outdoor fan 76 (first fan). The condenser 74 condenses the refrigerant compressed by the compressor 6 . The expansion device 75 reduces the pressure of the refrigerant condensed by the condenser 74 and adjusts the flow rate of the refrigerant. The throttle device 75 is also called a decompression device.

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

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

The configuration and operation of the refrigerating and air-conditioning device 7 described above are examples, and are not limited to the above-described example.

The refrigerating and air-conditioning apparatus 7 according to the third embodiment has the advantages described in the first and second embodiments.

Furthermore, since the refrigerating and air-conditioning apparatus 7 according to Embodiment 3 has the compressor 6 according to Embodiment 2, vibration and noise in the refrigerating and air-conditioning apparatus 7 can be reduced.

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

The features of each embodiment and the features of each modified example described above can be appropriately combined with each other.

1 Motor 2 Rotor 3 Stator 4 Motor Frame 6 Compressor 7 Refrigerating Air Conditioner 21 Rotor Core 22 Permanent Magnet 23 Shaft 32 Winding 33 Slot 61 Closed Container 211 Magnet Insertion Hole 212 Shaft hole 213 end slit 214 inner slit 221a first inner side 221b first outer curved portion 221c first outer side 222a second inner side 222b second outer curved portion 222c second 2110 magnet arrangement portion 2111 first flux barrier portion 2112 second flux barrier portion 2131 first end slit 2132 second end slit.

Claims (15)

A rotor having P magnetic poles (P is an integer of 2 or more),
a permanent magnet and
a magnet insertion hole having a magnet placement portion in which the permanent magnet is arranged, a first flux barrier portion communicating with the magnet placement portion, and a second flux barrier portion communicating with the magnet placement portion; a first end slit positioned between the first flux barrier portion and the second flux barrier portion and facing the first flux barrier portion; a rotor core having a second end slit positioned between two flux barrier sections and facing the second flux barrier section;
The magnet insertion hole has a V shape on a plane perpendicular to the axial direction of the rotor,
The rotor core is
a first inner side defining the first flux barrier portion and facing the first end slit;
a first outer curvature defining the first flux barrier portion and adjacent to the first inner side and located between the first inner side and an outer peripheral surface of the rotor core; Department and
a second inner side defining the second flux barrier portion and facing the second end slit;
a second outer curvature defining the second flux barrier portion and adjacent to the second inner side and located between the second inner side and an outer peripheral surface of the rotor core; and
In the plane orthogonal to the axial direction of the rotor, a straight line passing through a first boundary between the first inner side and the first outer curved portion and the center of rotation of the rotor is defined as L1, and the second Let L2 be a straight line passing through the second boundary between the inner side of and the second outer curved portion and the center of rotation of the rotor, and the angle between the straight line L1 and the straight line L2 be θ [degrees] When
251.7/P≤θ≤255/P
satisfy the
The rotor core is
a first end slit side defining the first end slit and facing the first flux barrier portion;
a first end slit defining the first end slit, adjacent to the first end slit side, and located between the first end slit side and the magnet insert hole; curved part and
has
In the plane perpendicular to the axial direction of the rotor, a straight line passing through the magnetic pole center of the rotor and perpendicular to the magnetic pole center line is a first boundary between the first inner side and the first outer curved portion. and intersecting the first end slit side is defined as a first point, the distance from the first boundary to the first point is defined as d11, and the first end slit side and the first end slit side A third boundary is a boundary between the end slit curved portion, and a second point is a point at which a straight line perpendicular to the magnetic pole center line passes through the third boundary and intersects the first inner side, When the distance from the third boundary to the second point is d12,
d11≧d12
A rotor that satisfies A rotor having P magnetic poles (P is an integer of 2 or more),
a permanent magnet and
a magnet insertion hole having a magnet placement portion in which the permanent magnet is arranged, a first flux barrier portion communicating with the magnet placement portion, and a second flux barrier portion communicating with the magnet placement portion; a first end slit positioned between the first flux barrier portion and the second flux barrier portion and facing the first flux barrier portion; a rotor core having a second end slit positioned between two flux barrier sections and facing the second flux barrier section;
The magnet insertion hole has a V shape on a plane perpendicular to the axial direction of the rotor,
The rotor core is
a first inner side defining the first flux barrier portion and facing the first end slit;
a first outer curvature defining the first flux barrier portion and adjacent to the first inner side and located between the first inner side and an outer peripheral surface of the rotor core; Department and
a second inner side defining the second flux barrier portion and facing the second end slit;
a second outer curvature defining the second flux barrier portion and adjacent to the second inner side and located between the second inner side and an outer peripheral surface of the rotor core; and
When the shortest distance from the first end slit to the magnet insertion hole is D1 [mm],
0.365≤D1≤0.865
satisfy the
The rotor core is
a first end slit side defining the first end slit and facing the first flux barrier portion;
a first end slit defining the first end slit, adjacent to the first end slit side, and located between the first end slit side and the magnet insert hole; curved part and
has
In the plane perpendicular to the axial direction of the rotor, a straight line passing through the magnetic pole center of the rotor and perpendicular to the magnetic pole center line is a first boundary between the first inner side and the first outer curved portion. and intersecting the first end slit side is defined as a first point, the distance from the first boundary to the first point is defined as d11, and the first end slit side and the first end slit side A third boundary is a boundary between the end slit curved portion, and a second point is a point at which a straight line perpendicular to the magnetic pole center line passes through the third boundary and intersects the first inner side, When the distance from the third boundary to the second point is d12,
d11≧d12
A rotor that satisfies In the plane orthogonal to the axial direction of the rotor, a straight line passing through a first boundary between the first inner side and the first outer curved portion and the center of rotation of the rotor is defined as L1, and the second Let L2 be a straight line passing through the second boundary between the inner side of and the second outer curved portion and the center of rotation of the rotor, and the angle between the straight line L1 and the straight line L2 be θ [degrees] When
251.7/P≤θ≤255/P
3. A rotor according to claim 2, wherein: 4. The rotor according to claim 2, wherein 0.365≤D1≤0.765. When the shortest distance from the second end slit to the magnet insertion hole is D2 [mm],
0.365≤D2≤0.865
5. The rotor according to any one of claims 2 to 4, wherein: When the shortest distance from the second end slit to the magnet insertion hole is D2 [mm],
5. The rotor according to any one of claims 2 to 4, wherein 0.365≤D2≤0.765 is satisfied. The rotor core is
a second end slit side defining the second end slit and facing the second flux barrier portion;
a second end slit defining the second end slit, adjacent to the second end slit side, and located between the second end slit side and the magnet insert hole; having a bend and
In the plane orthogonal to the axial direction of the rotor, a straight line orthogonal to the magnetic pole centerline passes through the second boundary between the second inner side and the second outer curved portion and the second 2 is defined as a third point, the distance from the second boundary to the third point is defined as d21, and the second end slit side and the second end slit curved portion are formed. A fourth boundary is defined as a boundary between When the distance from to the fourth point is d22,
d21≧d22
7. The rotor according to any one of claims 1 to 6, wherein: d11=d12
8. A rotor according to any one of claims 1 to 7, wherein: When the shortest distance from the first end slit to the first flux barrier portion is d13 [mm],
0.365≤d13≤0.55
9. A rotor according to claim 8 , wherein: When the shortest distance from the first end slit to the first flux barrier portion is d13 [mm],
0.365≤d13≤0.4
9. A rotor according to claim 8 , wherein: 11. The rotor according to any one of claims 1 to 10 , wherein ?=253.3/P. a stator;
A motor, comprising: a rotor according to any one of claims 1 to 11 arranged inside the stator. 13. The motor according to claim 12 , driven by inverter control. a closed container;
a compression device disposed within the closed vessel;
14. A compressor comprising a motor according to claim 12 or 13 for driving the compression device. a compressor according to claim 14 ;
An air conditioner comprising a heat exchanger and

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