WO2024070951A1

WO2024070951A1 - Rotating electrical machine, blower, compressor, and refrigeration device

Info

Publication number: WO2024070951A1
Application number: PCT/JP2023/034516
Authority: WO
Inventors: 司浅利; 能成浅野; 尚宏木戸; 寛日比野; 伸中増; 浩和藤井; 靖人柳田
Original assignee: ダイキン工業株式会社
Priority date: 2022-09-30
Filing date: 2023-09-22
Publication date: 2024-04-04
Also published as: JP2024051921A

Abstract

Provided is a technique that makes it possible to further improve the drive power and drive efficiency of a rotating electrical machine. A motor 1 according to one embodiment of the present disclosure comprises: a rotor 20 that is rotatably configured about a rotating shaft center AX; and a stator 10 that faces the rotor 20 in the radial direction. The stator 10 includes a stator core 11 formed of a soft magnetic material and a coil 12. The stator core 11 includes: a main tooth 11B having a tooth body portion 11B1 extending in the radial direction and around which the coil 12 is wound and a magnetic pole portion 11B2 provided at the end of the tooth body portion 11B1 and facing the rotor 20 in the radial direction; and an added tooth 11C having a magnetic pole portion 11C1 disposed adjacent to the main tooth 11B in the axial direction and facing the rotor 20 in the radial direction and holding portions 11C2, 11C3, 11C5 connected to or formed integrally with the magnetic pole portion 11C1 and disposed between the main tooth 11B and the coil 12 in the radial direction or the circumferential direction.

Description

Rotating electric machines, blowers, compressors, refrigeration equipment

This disclosure relates to rotating electrical machines, etc.

A technology is known that expands (extends) the magnetic poles at the tips of the teeth on which the windings of the stator core are arranged outward in the axial direction of a rotating electric machine, thereby improving the driving force and driving efficiency of the rotating electric machine (see, for example, Patent Documents 1 to 3).

WO 2008/47895 JP 2014-124007 A JP 2007-104781 A

However, the magnetic flux passing through the extended parts at the tips of the teeth tends to concentrate at the axial ends of the teeth, which can result in the axial ends of the teeth becoming magnetically saturated. This can reduce the effect of the extended parts at the tips of the teeth (improvements in driving force and driving efficiency).

The purpose of this disclosure is to provide technology that can further improve the driving force and driving efficiency of rotating electric machines.

In a first aspect of the present disclosure,
A rotor configured to be rotatable about a rotation axis;
a stator facing the rotor in a radial direction,
The stator includes an iron core made of a soft magnetic material and a winding,
The core includes a main body portion extending in a radial direction and around which the winding is wound, a first core having a first magnetic pole portion provided at a tip of the main body portion and facing the rotor in the radial direction, a second magnetic pole portion disposed adjacent to the first core in the axial direction and facing the rotor in the radial direction, and a second core having a peripheral portion connected to or formed integrally with the second magnetic pole portion and disposed between the first core and the winding in the radial or circumferential direction.
A rotating electric machine is provided.

According to this aspect, for example, the second core faces the first core in the radial or circumferential direction at the peripheral portion, and can be magnetically coupled to the first core through the facing surface. Therefore, the rotating electric machine can use the facing surface as a magnetic path for magnetic flux passing between the first and second cores. As a result, the magnetic flux passing between the second magnetic pole portion and the first core passes through the facing surface, and is therefore more likely to pass not only through the axial end of the first core, but also through a portion inside the axial end. Therefore, magnetic saturation of the axial end of the first core due to the magnetic flux passing between the second magnetic pole portion and the first core can be suppressed, and the driving force and driving efficiency of the rotating electric machine can be further improved.

In addition, in a second aspect of the present disclosure, based on the first aspect described above,
the first magnetic pole portion includes a flange portion that protrudes in a circumferential direction from a circumferential end surface of the main body portion,
The peripheral portion may be disposed between the flange portion and the winding.

In addition, in a third aspect of the present disclosure, on the premise of the first or second aspect described above,
The peripheral portion may be disposed between the body portion and the windings.

In addition, in a fourth aspect of the present disclosure,
A rotor configured to be rotatable about a rotation axis;
a stator facing the rotor in a radial direction,
The stator includes an iron core made of a soft magnetic material and a winding.
The iron core includes a main body portion extending in a radial direction and around which the winding is wound, a first iron core provided at a tip of the main body portion and having a first magnetic pole portion radially facing the rotor, and a second iron core arranged adjacent to the first iron core in the axial direction and having a second magnetic pole portion radially facing the rotor, and a peripheral portion connected to or formed integrally with the second magnetic pole portion,
the peripheral portion has an opposing surface that faces the first iron core in a radial direction or a circumferential direction,
the first iron core and the second iron core have a magnetic path between the second magnetic pole portion and the first iron core through the opposing surfaces;
A rotating electric machine is provided.

According to this aspect, the rotating electric machine can utilize the opposing surfaces that face each other in the circumferential and radial directions as a magnetic path for the magnetic flux passing between the first and second iron cores. Therefore, by passing through the opposing surfaces, the magnetic flux passing between the second magnetic pole portion and the first iron core can easily pass not only through the axial end of the first iron core, but also through locations inside the axial end. This suppresses magnetic saturation of the axial end of the first iron core caused by the magnetic flux passing between the second magnetic pole portion and the first iron core, and further improves the driving force and driving efficiency of the rotating electric machine.

In addition, in a fifth aspect of the present disclosure, based on the above-mentioned fourth aspect,
the first magnetic pole portion includes a flange portion that protrudes in a circumferential direction from a circumferential end surface of the main body portion,
The opposing surface may include a surface where the peripheral portion and the flange portion face each other in a radial direction.

In addition, in a sixth aspect of the present disclosure, on the premise of the fourth or fifth aspect described above,
The opposing surface may include a surface where the peripheral portion and the main body portion oppose each other in a circumferential direction.

In addition, in a seventh aspect of the present disclosure, on the premise of any one of the first to sixth aspects described above,
The second magnetic pole portion may be disposed adjacent to only one of both axial ends of the first core.

In addition, in an eighth aspect of the present disclosure, on the premise of any one of the first to sixth aspects described above,
The second magnetic pole portions may be disposed adjacent to both ends of the first core in the axial direction.

In addition, in a ninth aspect of the present disclosure, on the premise of any one of the first to eighth aspects described above,
The axial dimension of the peripheral portion may be greater than the axial dimension of the second pole portion.

In addition, in a tenth aspect of the present disclosure, on the premise of any one of the first to ninth aspects described above,
An axial dimension of a portion of the peripheral portion adjacent to the first core in the circumferential or radial direction may be the same as the axial dimension of the first core.

In addition, in an eleventh aspect of the present disclosure, on the premise of any one of the first to tenth aspects described above,
An area of a surface where the first core and the second core face each other in a circumferential or radial direction may be larger than an area of a surface where the first core and the second core face each other in an axial direction.

In addition, in a twelfth aspect of the present disclosure, on the premise of any one of the first to eleventh aspects described above,
The magnetic resistance between the circumferentially or radially opposing surfaces of the first iron core and the second iron core may be smaller than the magnetic resistance between the axially opposing surfaces of the first iron core and the second iron core.

In addition, in a thirteenth aspect of the present disclosure,
A rotating electric machine according to any one of the first to twelfth aspects described above is mounted on the vehicle.
A compressor is provided.

In addition, in a fourteenth aspect of the present disclosure,
A rotating electric machine according to any one of the first to twelfth aspects described above is mounted on the vehicle.
A blower is provided.

In addition, in a fifteenth aspect of the present disclosure,
A rotating electric machine according to any one of the first to twelfth aspects described above is mounted on the vehicle.
A refrigeration system is provided.

The above-described embodiment can further improve the driving force and driving efficiency of the rotating electric machine.

FIG. 2 is a front view showing an example of a motor. FIG. 2 is a front view showing an example of a yoke and teeth of a stator core. 13 is a front view showing another example of the yoke and teeth of the stator core. FIG. FIG. 2 is a perspective view showing the teeth, additional teeth, and coils of a stator. FIG. 13 is a perspective view showing a first example of an additional tooth. FIG. 13 is a perspective view showing a first example of an additional tooth. FIG. 11 is a perspective view showing a second example of an additional tooth. FIG. 11 is a perspective view showing a second example of an additional tooth. FIG. 13 is a perspective view showing a third example of an additional tooth. FIG. 13 is a perspective view showing a fourth example of an additional tooth. FIG. 13 is a perspective view showing a fifth example of an additional tooth. FIG. 13 is a perspective view showing a sixth example of an additional tooth. FIG. 13 is a perspective view showing an example of a tooth corresponding to a sixth example of the additional tooth. FIG. 13 is a perspective view showing a seventh example of an additional tooth. FIG. 13 is a perspective view showing an eighth example of an additional tooth. FIG. 13 is a perspective view showing an eighth example of an additional tooth. FIG. 13 is a perspective view showing an eighth example of an additional tooth. FIG. 13 is a perspective view showing a ninth example of an additional tooth. 11 is a diagram illustrating a schematic diagram of a flow of magnetic flux through an additional tooth of a motor according to a comparative example. FIG. 5A and 5B are diagrams illustrating a flow of magnetic flux through additional teeth of the motor according to the embodiment. FIG. 1 is a diagram illustrating an example of an air conditioner.

The following describes the embodiment with reference to the drawings.

[Motor configuration]
The configuration of a motor 1 according to this embodiment will be described with reference to FIGS.

1 is a front view showing an example of a motor 1. Specifically, FIG. 1 is a view showing an example of a motor 1 as viewed along an axial direction (hereinafter simply referred to as "axial direction") corresponding to the rotation axis AX of the motor 1. FIG. 2 is a front view showing an example of a yoke 11A and a main tooth 11B of a stator core 11. FIG. 3 is a front view showing another example of a yoke 11A and a main tooth 11B of a stator core 11. Specifically, FIG. 2 and FIG. 3 are views showing an example and another example of a stator core 11 as viewed along the axial direction. FIG. 4 is a perspective view showing a main tooth 11B, an additional tooth 11C, and a coil 12 of a stator 10. Specifically, FIG. 4 is a perspective view showing a main tooth 11B, an additional tooth 11C, and a coil 12 of a stator 10 as viewed from the outside in a radial direction (hereinafter simply referred to as "radial direction") based on the rotation axis AX of the motor 1, and the additional tooth 11C in FIG. 4 corresponds to a first example (FIGS. 5 and 6) described below.

As shown in FIG. 1, motor 1 is an outer rotor type and is driven by a multi-phase (e.g., three-phase) armature current.

As shown in Figures 1 to 4, the motor 1 includes a stator 10, a rotor 20, and a shaft 30.

The stator 10 is an armature that is positioned radially inward from the rotor 20.

The stator 10 includes a stator core 11 and a coil 12.

The stator core 11 is made of a soft magnetic material, and acts as a magnetic path for the magnetic flux generated by the armature current of the coil 12 and the magnetic flux of the permanent magnets 21 of the rotor 20. The soft magnetic material used in the stator core 11 is, for example, an iron-based material such as cast iron or steel for mechanical construction. The soft magnetic material used in the stator core 11 may also be a functional material such as a silicon steel sheet (electromagnetic steel sheet) or a powder magnetic core. A powder magnetic core is an iron core manufactured by applying an insulating coating to metal powder of a soft magnetic material and compressing it, and a powder magnetic core can be used to manufacture an iron core with a complex three-dimensional shape. The same may be true for the soft magnetic material used in the rotor core described below.

The stator core 11 includes a yoke 11A, main teeth 11B, and additional teeth 11C.

When viewed along the axial direction, the yoke 11A has a circular ring shape centered on the rotation axis AX.

The main teeth 11B are arranged at the radially outer (outer periphery) end (e.g., outer periphery) of the yoke 11A so as to face the rotor 20 arranged radially outward via an air gap.

The main teeth 11B are arranged at substantially equal intervals (12 in this example) in the circumferential direction (hereinafter simply referred to as the "circumferential direction") based on the rotation axis AX of the motor 1.

The word "abbreviated" is intended to allow for manufacturing errors, for example, and will be used in the same sense below.

The main tooth 11B includes a tooth body portion 11B1 and a magnetic pole portion 11B2.

The tooth main body portion 11B1 is provided so as to extend radially from the outer peripheral surface of the yoke 11A. The coil 12 is wound around the tooth main body portion 11B1.

The magnetic pole portion 11B2 is provided at the radially outer tip of the tooth body portion 11B1 and faces the rotor 20 in the radial direction via an air gap. The magnetic pole portion 11B2 acts as a magnetic pole due to the magnetic flux generated by the armature current of the coil 12.

For example, as shown in Figures 1 to 3, the magnetic pole portion 11B2 has an outer peripheral surface that is composed of a curved surface that is approximately arc-shaped and centered on the rotation axis AX, i.e., a curved surface that corresponds to a circumferential portion of a cylindrical surface, when viewed along the axial direction. The magnetic pole portion 11B2 also has approximately the same axial dimension as the tooth main body portion 11B1. The magnetic pole portion 11B2 also has a widthwise (circumferential) dimension that is larger than that of the tooth main body portion 11B1. The width direction of the main tooth 11B means the dimension perpendicular to the radial direction at the circumferential position where the target main tooth 11B is provided, when viewed along the axial direction. The width of the additional tooth 11C described below is also used in the same sense. Specifically, the magnetic pole portion 11B2 has a flange portion 11B3 that corresponds to the portion that protrudes outward at both ends in the widthwise (circumferential) direction from the tooth main body portion 11B1 when the main tooth 11B is viewed from the outside in the radial direction at the circumferential position where the target main tooth 11B is provided. In the axial direction, the end of the magnetic pole portion 11C1 (the end opposite to the side adjacent to the main tooth 11B) may be approximately aligned with the end of the permanent magnet 21, or may be located on the inside (main tooth 11B side) of the end of the permanent magnet 21. This allows the area of the portion of the magnetic pole portion 11B2 facing the rotor 20 (facing area with the rotor 20) to be relatively large. Therefore, the magnetic flux of the rotor 20 (permanent magnet 21) that links with the coil 12 of the stator 10 can be increased, and as a result, the driving force and driving efficiency of the motor 1 can be improved. In addition, the magnetic pole portion 11B2 can suppress the movement of the coil 12 radially outward by the action of the flange portion 11B3.

As shown in FIG. 2, the yoke 11A and the main teeth 11B may be formed as one piece, or as shown in FIG. 3, they may be formed as separate pieces. In the latter case, for example, as shown in FIG. 3, the outer peripheral surface of the yoke 11A is provided with a radially extending convex portion 11Aa, and the radially inner end of the main teeth 11B is provided with a concave portion 11Ba into which the convex portion 11Aa can fit. This allows the main teeth 11B to be connected to the yoke 11A by fitting the convex portion 11Aa into the concave portion 11Ba.

The additional teeth 11C are arranged so as to face the rotor 20 in the radial direction via an air gap, and to be adjacent to the tips of the main teeth 11B in the axial direction. The additional teeth 11C may be provided for all the main teeth 11B, or may be provided for some of the main teeth 11B. In the latter case, for example, the additional teeth 11C are provided for every other main tooth 11B arranged in the circumferential direction.

The additional teeth 11C can be magnetically coupled to the main teeth 11B. As a result, the additional teeth 11C act as magnetic poles due to the magnetic flux generated by applying an armature current to the coils 12. Therefore, in addition to the main teeth 11B (magnetic pole portion 11B2), the additional teeth 11C (magnetic pole portion 11C1 described below) can increase the area of the magnetic poles that face the rotor 20 of the stator core 11. This makes it possible to increase the magnetic flux of the rotor 20 (permanent magnet 21) that links with the coils 12 of the stator 10, thereby improving the driving force and driving efficiency of the motor 1.

The additional teeth 11C may or may not be fixed to the main teeth 11B. For example, the additional teeth 11C are fixed to the main teeth 11B by adhesive or the like. Also, the stator core 11 and coils 12 of the stator 10 may be held by a resin mold. In this case, since the position is fixed by the resin mold, the additional teeth 11C do not have to be fixed to the main teeth 11B.

Furthermore, the additional teeth 11C may or may not be in contact with the main teeth 11B as long as they can be magnetically coupled. For example, in a structure in which the stator core 11 and coils 12 of the stator 10 are insulated by a resin mold, the main teeth 11B and the additional teeth 11C may be separated by resin between them as long as they can be magnetically coupled. Also, for example, in a case in which the additional teeth 11C are connected to the main teeth 11B with an adhesive, the main teeth 11B and the additional teeth 11C may be separated by the adhesive between them as long as they can be magnetically coupled.

The coil 12 is formed by winding a conductor around the main tooth 11B (tooth body portion 11B1).

The radial outer end of the coil 12 has a predetermined gap between it and the radial inner side of the magnetic pole portion 11B2.

Electrical insulation is ensured between the stator core 11 and the coil 12 by an insulating section.

For example, the insulating portion is an insulating member disposed between the stator core 11 and the coil 12. The insulating member is insulating paper, a film, an insulator, a bobbin, etc. The insulating portion may also be an insulating coating formed on the conductor of the coil 12.

The rotor 20 is a permanent magnet field that is provided radially outside the stator 10.

The rotor 20 includes a permanent magnet 21.

For example, as shown in FIG. 1, the permanent magnet 21 has a generally cylindrical shape.

The permanent magnet 21 is, for example, a ring magnet with different magnetic poles arranged at approximately equal intervals on the inside in the radial direction.

The rotor 20 may also include a rotor core (iron core) made of a soft magnetic material in addition to the permanent magnets 21. For example, the motor 1 may be a surface permanent magnet type (SPM: Surface Permanent Magnet), and the rotor 20 has a cylindrical rotor core arranged adjacent to the radial outside of the permanent magnets 21 that face the stator 10. The motor 1 may also be an interior permanent magnet type (IPM: Interior Permanent Magnet), and the rotor 20 may have a structure in which the permanent magnets 21 are embedded inside the cylindrical rotor core at equal intervals in the circumferential direction.

The rotor 20 (permanent magnet 21) is positioned in the axial direction to include the entire range in which the main teeth 11B (magnetic pole portion 11B2) and the additional teeth (magnetic pole portion 11C1 described below) are present. This allows the rotor 20 (permanent magnet 21) to face the main teeth 11B and the additional teeth 11C in the radial direction via a gap.

The shaft 30 is provided on the circumferential inside of the stator 10 (yoke 11A) and has a cylindrical shape with the rotation axis AX as its central axis. The shaft 30 may also be provided at a position offset from the range in which the stator 10 is provided in the axial direction.

The shaft 30 is coupled to the rotor 20 at a position offset in the axial direction from the range in which the stator 10 is provided, and is rotatably held relative to the fixed part of the motor 1 via a bearing (not shown). This allows the rotor 20 to rotate freely via the shaft 30, and the magnetic interaction between the rotor 20 and the stator 10 allows it to rotate together with the shaft 30 relative to the fixed part of the motor 1.

[Additional teeth details]
Next, the additional teeth 11C will be described in detail with reference to FIGS. 5 to 17 in addition to FIG.

In the following, FIG. 4 is used to explain not only the arrangement of the additional teeth 11C in the motor 1 of the first example, but also the arrangements of the additional teeth 11C in the motor 1 of the second to seventh examples. Also, FIG. 15 and FIG. 16 are used to explain not only the arrangement of the additional teeth 11C in the motor 1 of the eighth example and the assembly method of that motor 1, but also the arrangement of the additional teeth in the motor 1 of the ninth example and the assembly method of that motor 1.

<First Example>
5 and 6 are perspective views showing a first example of the additional tooth 11C. Specifically, Fig. 5 is a perspective view of the first example of the additional tooth 11C seen from a direction corresponding to the radial outside, and Fig. 6 is a perspective view of the first example of the additional tooth 11C seen from a direction corresponding to the radial inside.

As shown in Figures 4 to 6, the additional tooth 11C includes a magnetic pole portion 11C1 and a retaining portion 11C2.

The magnetic pole portion 11C1 is disposed axially adjacent to the magnetic pole portion 11B2 of the main tooth 11B, and faces the rotor 20 radially via an air gap. The magnetic pole portion 11C1 acts as a magnetic pole due to the magnetic flux generated by the armature current of the coil 12 wound around the main tooth 11B, which is magnetically coupled to the additional tooth 11C.

Like magnetic pole portion 11B2, magnetic pole portion 11C1 has a widthwise (circumferential) dimension that is greater than tooth main body portion 11B1. For example, magnetic pole portion 11C1 has substantially the same widthwise dimension as magnetic pole portion 11B2. Magnetic pole portion 11C1 may have a widthwise dimension greater than magnetic pole portion 11B2, or may have a widthwise dimension smaller than magnetic pole portion 11B2 as long as it has a widthwise dimension greater than tooth main body portion 11B1.

In addition, in this example, the magnetic pole portion 11C1 has an outer peripheral surface that is a curved surface that is substantially arc-shaped about the rotation axis AX when viewed along the axial direction, that is, a curved surface that corresponds to a circumferential portion of a cylindrical surface. In this case, the radius of the outer peripheral surface of each of the magnetic pole portions 11B2 and 11C1 about the rotation axis AX may be substantially the same. This allows the outer peripheral surfaces of the magnetic pole portions 11B2 and 11C1 to be substantially flush, as shown in FIG. 4.

Two retaining portions 11C2 are provided at both ends of the magnetic pole portion 11C1 in the width direction with a specified distance between them. The specified distance is set to be larger than the width dimension of the tooth main body portion 11B1. This allows the two retaining portions 11C2 to be arranged so that they sandwich the tooth main body portion 11B1 in the width direction (circumferential direction).

The retaining portion 11C2 is provided so as to extend in the axial direction from the axial end of the magnetic pole portion 11C1 on the side adjacent to the main tooth 11B (magnetic pole portion 11B2). The retaining portion 11C2 is also offset in the radial direction so that its outer end face is located inside the magnetic pole portion 11C1. This allows the retaining portion 11C2 to be positioned inside the magnetic pole portion 11B2 in the radial direction. By appropriately setting the offset amount, the retaining portion 11C2 can be positioned outside the coil 12 in the radial direction. Therefore, the retaining portion 11C2 can be positioned between the magnetic pole portion 11B2 of the main tooth 11B and the coil 12 in the radial direction. Therefore, the additional tooth 11C can retain the position of the magnetic pole portion 11C1 by the action of the retaining portion 11C2.

For example, as shown in FIG. 4, the axial dimension of the retaining portion 11C2 is longer than the axial dimension of the main tooth 11B. Also, the axial dimension of the retaining portion 11C2 may be equal to or shorter than the axial dimension of the main tooth 11B.

Furthermore, the axial dimension of the retaining portion 11C2 may be longer than the axial dimension of the magnetic pole portion 11C1. This makes it possible to reduce the force acting from the tip of the retaining portion 11C2 on the main teeth 11B (the flange portion 11B3 and the teeth main body portion 11B1 of the magnetic pole portion 11B2) or the coil 12 due to the magnetic attraction force acting on the magnetic pole portion 11C1 in conjunction with the magnetic force of the permanent magnet 21 of the rotor 20. This is because the length from the fulcrum to the point of action at the tip of the retaining portion 11C2 can be made relatively longer than the distance from the point of application of the magnetic attraction force to the point of application. As a result, the occurrence of damage or failure of the main teeth 11B or the coil 12 can be suppressed.

In this example, the additional teeth 11C, including the magnetic pole portion 11C1 and the retaining portion 11C2, have approximately the same thickness. For example, the additional teeth 11C may be formed by performing a press process or a bending process on a member punched out of a flat plate-shaped soft magnetic material. This allows the additional teeth 11C to be manufactured relatively easily. The additional teeth 11C may also be made of a powder core. For example, the additional teeth 11C are formed by molding metal powder of a soft magnetic material with an insulating coating by die pressing, and then performing a heat treatment.

For example, in the manufacturing process of the motor 1, a worker moves the additional tooth 11C from the tip side of the retaining portion 11C2 in the axial direction so that it approaches the main tooth 11B. This allows the worker to attach the additional tooth 11C to the main tooth 11B so that the tooth body portion 11B1 is sandwiched between the two retaining portions 11C2 and the two retaining portions 11C2 are radially inward of the magnetic pole portion 11B2.

In addition, the additional teeth 11C in this example may be provided adjacent to not only one axial side of the magnetic pole portion 11B2 but also the other axial side, and two additional teeth 11C may be attached to one main tooth 11B. In this case, for example, the retaining portions 11C2 of the two additional teeth 11C are provided to the main tooth 11B such that at least one of the positions in the width direction (circumferential direction) and radial direction differs from each other. This allows the two additional teeth 11C to be attached to appropriate positions relative to the main tooth 11B while avoiding interference between the retaining portions 11C2 of the two additional teeth 11C. Furthermore, the axial dimension of the retaining portions 11C2 of the two additional teeth 11C may be set to be smaller than half the axial dimension of the main tooth 11B. As a result, even if the widthwise (circumferential) and radial positions of the retaining portions 11C2 of the two additional teeth 11C are approximately the same, the two additional teeth 11C can be attached to appropriate positions relative to the main teeth 11B while avoiding interference between the retaining portions 11C2. Therefore, the two additional teeth 11C can be realized using the same parts, which reduces costs and improves assembly. The same may be true for the second to seventh examples described below.

Furthermore, the retaining portion 11C2 of the additional tooth 11C may be biased in a direction approaching the magnetic pole portion 11B2. For example, a member equivalent to a leaf spring may be sandwiched between the retaining portion 11C2 of the additional tooth 11C and the coil 12, and this member presses the retaining portion 11C2 towards the magnetic pole portion 11B2. Furthermore, the retaining portion 11C2 of the additional tooth 11C may function as a leaf spring between the magnetic pole portion 11B2 and the coil 12, and press a part of itself towards the magnetic pole portion 11B2. The same may be true for the second to ninth examples described below.

The retaining portion 11C2 of the additional tooth 11C may be retained (supported) by an insulating member such as an insulator or a bobbin. For example, the radial position of the retaining portion 11C2 is retained by an insulating member between the retaining portion 11C2 and the coil 12. The same may be true for the second to ninth examples described below.

<Second Example>
7 and 8 are perspective views showing a second example of the additional tooth 11C. Specifically, Fig. 7 is a perspective view of the second example of the additional tooth 11C seen from a direction corresponding to the radial outside, and Fig. 7 is a perspective view of the second example of the additional tooth 11C seen from a direction corresponding to the radial inside.

　In the following, the same reference numerals will be used to designate configurations that are the same as or correspond to those in the first example described above, and the following description will focus on the differences from the first example described above.

As shown in Figures 7 and 8, the additional tooth 11C includes a magnetic pole portion 11C1 and a retaining portion 11C2.

In this example, the magnetic pole portion 11C1 has a larger radial dimension (thickness) than the first example described above. For example, the magnetic pole portion 11C1 is configured so that it is substantially flush with the magnetic pole portion 11B2 on the radially inner side when viewed along the axial direction. This increases the volume (cross-sectional area) of the magnetic path of the magnetic pole portion 11C1, thereby reducing the magnetic resistance.

<Third Example>
Fig. 9 is a perspective view showing a third example of the additional tooth 11C. Specifically, Fig. 9 is a perspective view of the third example of the additional tooth 11C as viewed from a direction corresponding to the radial outside.

In the following, the same reference numerals will be used to designate configurations that are the same as or correspond to those in the first and second examples described above, and the following description will focus on the differences from the first and second examples described above.

As shown in FIG. 9, the additional tooth 11C includes a magnetic pole portion 11C1 and a retaining portion 11C2.

In this example, the additional teeth 11C, unlike the first and second examples described above, have a flat plate shape with a generally uniform thickness throughout, including the magnetic pole portion 11C1 and the retaining portion 11C2. For example, the additional teeth 11C are formed by punching out a flat plate of soft magnetic material. This makes it very easy to manufacture the additional teeth 11C.

<Fourth Example>
Fig. 10 is a perspective view showing a fourth example of the additional tooth 11C. Specifically, Fig. 10 is a perspective view of the fourth example of the additional tooth 11C as viewed from a direction corresponding to the radial outside.

　In the following, the same reference numerals will be used to designate configurations that are the same as or correspond to those in the first to third examples described above, and the following description will focus on the differences from the first to third examples described above.

As shown in FIG. 10, the additional tooth 11C includes a magnetic pole portion 11C1 and a retaining portion 11C2, similar to the second example described above. Also, unlike the second example described above, the additional tooth 11C includes a retaining portion 11C3. In other words, in this example, the additional tooth 11C is based on the second example described above, with the retaining portion 11C3 added.

The magnetic pole portion 11C1 is set to have a wider width dimension than the second example described above.

The retaining portion 11C3 is provided at both ends of the magnetic pole portion 11C1 so as to extend in the axial direction from the end adjacent to the main tooth 11B (magnetic pole portion 11B2). The retaining portion 11C3 is also provided so as to extend in the axial direction along the outer end of the width direction of the retaining portion 11C2. This allows the retaining portion 11C3 to hold the outer side of the width direction of the magnetic pole portion 11B2. Therefore, the additional tooth 11C can more appropriately hold the position of the magnetic pole portion 11C1 by the action of the retaining portion 11C3 in addition to the retaining portion 11C2.

In addition, the outer peripheral surface of the retaining portion 11C3 faces the rotor 20 in the radial direction. As a result, the outer peripheral surface of the retaining portion 11C3 acts as a magnetic pole due to the magnetic flux generated by the armature current of the coil 12 wound around the main tooth 11B, which is magnetically coupled to the additional tooth 11C. This increases the area of the magnetic pole of the stator core 11 that faces the rotor 20, thereby further improving the driving force and driving efficiency of the motor 1.

In addition, the retaining portion 11C3 may be applied based on the additional teeth 11C of the first example (Figures 5 and 6) or the third example (Figure 9) described above.

<Fifth Example>
Fig. 11 is a perspective view showing a fifth example of the additional tooth 11C. Specifically, Fig. 11 is a perspective view of the fifth example of the additional tooth 11C as viewed from a direction corresponding to the radial outside.

　In the following, the same reference numerals will be used to designate configurations that are the same as or correspond to those in the first to fourth examples described above, and the following description will focus on the differences from the first to fourth examples described above.

As shown in FIG. 11, the additional tooth 11C includes a magnetic pole portion 11C1 and a retaining portion 11C2, similar to the second example described above. Also, unlike the second example described above, the additional tooth 11C includes retaining portions 11C4 and 11C5. In other words, in this example, the additional tooth 11C is based on the second example described above, with retaining portions 11C4 and 11C5 added.

The holding portion 11C4 has a flat plate shape that is approximately parallel to the axial direction and extends from the radially inner side of the magnetic pole portion 11C1.

The retaining portion 11C4 is arranged so that it can be positioned in the gap between the end face of the tooth main body portion 11B1 on the magnetic pole portion 11C1 side and the coil 12 in the axial direction.

The retaining portions 11C5 have a flat plate shape that is approximately parallel in both the radial and axial directions at the circumferential position where the corresponding main tooth 11B is provided, and are provided so as to extend from the radial inner side of each of the retaining portions 11C2. As a result, the widthwise spacing between the two retaining portions 11C5 is set to be larger than the tooth main body portion 11B1.

The two retaining portions 11C5 are each provided so that they can be positioned in the gap between the widthwise end face of the tooth body portion 11B1 and the inside of the coil 12.

The retaining portion 11C4 is connected to each of the two retaining portions 11C5 at both ends in the width direction. This allows the retaining portions 11C4 and 11C5 to be arranged as a single unit and inserted into the gap between the tooth main body portion 11B1 and the coil 12. Therefore, the additional tooth 11C can more appropriately retain the position of the magnetic pole portion 11C1 through the action of the retaining portions 11C4 and 11C5 in addition to the retaining portion 11C2.

In addition, only the latter of the retaining portion 11C4 and the retaining portion 11C5 (retaining portion 11C5) may be applied to the additional tooth 11C. Also, the retaining portion 11C4 and the retaining portion 11C5 may be applied based on the additional tooth 11C of the above-mentioned first example (FIGS. 5 and 6), third example (FIG. 9), or fourth example (FIG. 10).

<Sixth Example>
Fig. 12 is a perspective view showing a sixth example of the additional tooth 11C. Specifically, Fig. 12 is a perspective view of the sixth example of the additional tooth 11C as viewed from a direction corresponding to the radial outside. Fig. 13 is a perspective view of an example of a tooth corresponding to the sixth example of the additional tooth 11C. Specifically, Fig. 13 is a perspective view of an example of a tooth corresponding to the sixth example of the additional tooth 11C as viewed from a direction corresponding to the radial outside.

　In the following, the same reference numerals will be used to designate configurations that are the same as or correspond to those in the first to fifth examples described above, and the following description will focus on the differences from the first to fifth examples described above.

As shown in FIG. 12, the additional tooth 11C includes a magnetic pole portion 11C1 and a retaining portion 11C2, similar to the second example described above. Also, unlike the second example described above, the additional tooth 11C includes a retaining portion 11C6. In other words, in this example, the additional tooth 11C is based on the second example described above, with the retaining portion 11C6 added.

The retaining portion 11C6 is provided so as to extend in the axial direction from the axial end face of the magnetic pole portion 11C1 on the side adjacent to the magnetic pole portion 11B2. For example, as shown in FIG. 12, the retaining portion 11C6 has a cylindrical shape, and one is provided in the center of the magnetic pole portion 11C1 in the width direction. Also, multiple retaining portions 11C6 may be provided.

As shown in FIG. 13, in this example, a hole 11B4 is provided in the end face of the magnetic pole portion 11B2 of the main tooth 11B adjacent to the magnetic pole portion 11C1.

The hole 11B4 is arranged in the main tooth 11B (magnetic pole portion 11B2) so that it is in approximately the same position as the retaining portion 11C6 when viewed along the axial direction when the magnetic pole portion 11B2 and the magnetic pole portion 11C1 are appropriately adjacent to each other in the axial direction. The hole 11B4 has a depth, for example, equal to or greater than the axial length of the retaining portion 11C6. The hole 11B4 may also penetrate the magnetic pole portion 11B2 in the axial direction. This allows the additional tooth 11C to be attached to the main tooth 11B by inserting the retaining portion 11C6 into the hole 11B4 in the axial direction. Therefore, the additional tooth 11C can more appropriately retain the position of the magnetic pole portion 11C1 by the action of the retaining portion 11C6 in addition to the retaining portion 11C2.

In addition, the retaining portion 11C6 and the hole portion 11B4 may be applied based on the additional teeth 11C of the first example (Figures 5 and 6), the third example (Figure 9), the fourth example (Figure 10), or the fifth example (Figure 11) described above.

<Example 7>
Fig. 14 is a perspective view showing a seventh example of the additional tooth 11C. Specifically, Fig. 14 is a perspective view of the seventh example of the additional tooth 11C as viewed from a direction corresponding to the outer side in the radial direction.

　In the following, the same reference numerals will be used to designate configurations that are the same as or correspond to the first to sixth examples described above, and the following description will focus on the differences from the first to sixth examples described above.

As shown in FIG. 14, the additional tooth 11C includes a magnetic pole portion 11C1, similar to the second example described above. Also, unlike the second example described above, the additional tooth 11C omits the retaining portion 11C2 and instead includes a retaining portion 11C6. In other words, in this example, the additional tooth 11C is based on the second example described above, with the retaining portion 11C2 omitted and the retaining portion 11C6 added.

For example, two holding portions 11C6 are provided. Also, as in the sixth example described above, there may be one holding portion 11C6, or three or more holding portions 11C6.

In this example, as in the sixth example described above, holes 11B4 corresponding to the retaining portions 11C6 are provided in the magnetic pole portions 11B2 of the main teeth 11B. This allows the additional teeth 11C to be attached to the main teeth 11B by inserting the retaining portions 11C6 axially into the holes 11B4. Therefore, the additional teeth 11C can retain the position of the magnetic pole portions 11C1 by the action of the retaining portions 11C6 instead of the retaining portions 11C2.

In addition, in the above-mentioned first example (FIGS. 5 and 6), third example (FIG. 9), and fifth example (FIG. 11), the retaining portion 11C2 may be omitted and the retaining portion 11C6 may be applied.

<Example 8>
Figures 15 to 17 are perspective views showing an eighth example of the additional tooth 11C. Specifically, Figure 15 is a perspective view of the eighth example of the additional tooth 11C as viewed from a direction corresponding to the radially outer side. Figure 16 is a perspective view of the eighth example of the additional tooth 11C attached to the main tooth 11B corresponding to Figure 3 described above. Figure 17 is a perspective view of the eighth example of the additional tooth 11C attached to the main tooth 11B corresponding to Figure 2 described above.

　In the following, the same reference numerals will be used to designate configurations that are the same as or correspond to the first to seventh examples described above, and the following description will focus on the differences from the first to seventh examples described above.

As shown in Figures 15 to 17, the additional tooth 11C includes a magnetic pole portion 11C1 and a retaining portion 11C2, similar to the second example described above. Also, unlike the second example described above, the additional tooth 11C includes two magnetic pole portions 11C1. In other words, in this example, the additional tooth 11C is based on the second example described above, with one additional magnetic pole portion 11C1. This makes it possible to further increase the area of the magnetic pole of the stator core 11 that faces the rotor 20. This makes it possible to further increase the magnetic flux of the rotor 20 (permanent magnet 21) that links with the coil 12 of the stator 10, and as a result, it is possible to further improve the driving force and driving efficiency of the motor 1.

In this example, two magnetic pole portions 11C1 are provided adjacent to each of the axial end faces of the magnetic pole portion 11B2. As a result, the axial distance between the two magnetic pole portions 11C1 is set to be larger than the axial dimension of the magnetic pole portion 11B2 (and the tooth main body portion 11B1).

The retaining portion 11C2 connects the two magnetic pole portions 11C1 in the axial direction. As a result, when viewed radially from the circumferential position where the corresponding main tooth 11B is located, a through hole larger than the outer shape of the tooth body portion 11B1 is provided in the center of the additional tooth 11C.

For example, as shown in FIG. 16, in the case of main teeth 11B that are formed separately from the yoke 11A, the additional teeth 11C can be attached to the main teeth 11B by inserting them into the through holes of the additional teeth 11C from the radial outside.

17, when the yoke 11A and the main teeth 11B are integrally formed, the magnetic pole portions 11B2 at the tips of the main teeth 11B may have the same width dimension as the teeth main body portion 11B1 before the additional teeth 11C are attached. Specifically, before the additional teeth 11C are attached, the magnetic pole portions 11B2 are in a state in which the portion (brim portion 11B3) that protrudes outward from the teeth main body portion 11B1 in the width direction of the magnetic pole portions 11B2 extends radially outward when viewed from the outside in the radial direction. This allows the main teeth 11B to be inserted into the through holes of the additional teeth 11C while the additional teeth 11C are brought closer to the main teeth 11B from the outside in the radial direction, and as a result, the additional teeth 11C can be attached to the main teeth 11B. After the additional tooth 11C is attached, the portion of the magnetic pole portion 11B2 that extends radially outward (the portion corresponding to the flange portion 11B3) is folded from the base end by bending or the like. This allows the width dimension of the magnetic pole portion 11B2 to be larger than that of the tooth body portion 11B1.

In addition, the magnetic pole portion 11C1 of this example may be added based on the additional teeth 11C of the fourth example (Figure 10) or the fifth example (Figure 11) described above.

<Example 9>
Fig. 18 is a perspective view showing a ninth example of the additional tooth 11C. Specifically, Fig. 18 is a perspective view of the ninth example of the additional tooth 11C as viewed from a direction equivalent to the radial outside.

In the following, the same reference numerals will be used to designate configurations that are the same as or correspond to those in the first to eighth examples described above, and the following description will focus on the differences from the first to eighth examples described above.

As shown in FIG. 18, the additional tooth 11C includes a magnetic pole portion 11C1 and a retaining portion 11C2, similar to the third example described above. Also, unlike the third example described above, the additional tooth 11C includes two magnetic pole portions 11C1. In other words, in this example, the additional tooth 11C is based on the third example described above, with one additional magnetic pole portion 11C1.

In this example, as in the eighth example described above, two magnetic pole portions 11C1 are provided adjacent to each of the two axial end faces of the magnetic pole portion 11B2. As a result, the axial distance between the two magnetic pole portions 11C1 is set to be larger than the axial dimension of the magnetic pole portion 11B2 (and the tooth main body portion 11B1).

The retaining portion 11C2 connects the two magnetic pole portions 11C1 in the axial direction, as in the eighth example described above. As a result, when viewed radially from the circumferential position where the corresponding main tooth 11B is located, a through hole larger than the outer shape of the tooth body portion 11B1 is provided in the center of the additional tooth 11C.

In this example, the additional teeth 11C, like the third example described above, have a flat plate shape with a generally uniform thickness throughout, including the magnetic pole portion 11C1 and the retaining portion 11C2. For example, like the third example described above, the additional teeth 11C are formed by punching out a flat plate of soft magnetic material. This makes it very easy to manufacture the additional teeth 11C.

[Comparison with Comparative Example]
Next, with reference to FIGS. 19 and 20, the motor 1 (additional teeth 11C) according to this embodiment will be compared with a motor (additional teeth 11CC) according to a comparative example.

FIG. 19 is a diagram showing the flow of magnetic flux through additional tooth 11CC of a motor according to a comparative example. FIG. 20 is a diagram showing the flow of magnetic flux through additional tooth 11C of motor 1 according to an embodiment.

In FIG. 19, the same reference numerals are used for the components of the motor according to the comparative example that are the same as those of motor 1.

As shown in FIG. 19, the additional teeth 11CC of the motor according to the comparative example are not provided with the retaining portions 11C2-11C6, and the main teeth 11B and the additional teeth 11CC are magnetically coupled only at the opposing surfaces adjacent (opposing) in the axial direction. Therefore, the magnetic flux passing between the magnetic pole portion 11C1 and the main teeth 11B (white arrows in the figure) passes through the opposing surfaces that face each other in the axial direction between the magnetic pole portion 11C1 and the magnetic pole portion 11B2. As a result, the magnetic flux is more likely to flow near the axial end of the teeth main body portion 11B1 (dashed line frame in the figure). This is because the magnetic flux flows through a path with smaller magnetic resistance (shorter path). Therefore, magnetic saturation occurs near the axial end of the teeth main body portion 11B1, and as a result, the effect of the magnetic pole portion 11C1 of the additional teeth 11CC (improvement of driving force and driving efficiency) may be reduced.

In contrast, as shown in FIG. 20, for example, the additional tooth 11C according to this embodiment has a retaining portion 11C2 adjacent (facing) the main tooth 11B in the radial and circumferential directions, and the retaining portion 11C2 and the main tooth 11B are magnetically coupled through the facing surface. Therefore, the magnetic flux passing between the magnetic pole portion 11C1 and the main tooth 11B (white arrow in the figure) can pass through the retaining portion 11C2 in the axial direction. As a result, the magnetic flux is likely to flow through the facing surface between the retaining portion 11C2 and the main tooth 11B not only near the axial end of the tooth main body portion 11B1, but also in the area inside the axial end. Therefore, magnetic saturation near the axial end of the tooth main body portion 11B1 can be suppressed, and the driving force and driving efficiency of the motor 1 can be further improved.

In addition, the retaining portions 11C3, 11C5, and 11C6 are adjacent to (opposite) the main tooth 11B in the radial and circumferential directions so that they can be magnetically coupled, and therefore can achieve the same effects and advantages as the retaining portion 11C2.

It is preferable to set the axial length of the portion of the retaining portion 11C2 adjacent to the tooth main body portion 11B1 and the magnetic pole portion 11B2 (flange portion 11B3) so as to be magnetically coupled in the radial and circumferential directions to be larger. The same may be true for the retaining portions 11C3, 11C5, and 11C6. This is because magnetic flux becomes easier to flow on the axial inside of the main tooth 11B, and magnetic saturation near the axial end of the tooth main body portion 11B1 can be more appropriately suppressed.

For example, the axial length of the portion of the retaining portion 11C2 adjacent to the tooth main body portion 11B1 and the magnetic pole portion 11B2 (flange portion 11B3) in the radial or circumferential direction so as to be magnetically coupled is at least half the axial dimension of the main tooth 11B (tooth main body portion 11B1). In addition, the axial length of the portion of the retaining portion 11C2 adjacent to the tooth main body portion 11B1 and the magnetic pole portion 11B2 (flange portion 11B3) in the radial or circumferential direction so as to be magnetically coupled may be the same as the axial dimension of the main tooth 11B (tooth main body portion 11B1).

Furthermore, the magnetic resistance between the circumferentially or radially opposing surfaces of the main teeth 11B and the additional teeth 11C may be smaller than the magnetic resistance between the axially opposing surfaces of the main teeth 11B and the additional teeth 11C. The same may be true for the retaining portions 11C3, 11C5, and 11C6. This makes it easier for the magnetic flux passing between the magnetic pole portion 11C1 and the main teeth 11B to flow through the circumferentially or radially opposing surfaces than through the axially opposing surfaces between the main teeth 11B and the additional teeth 11C. This makes it possible to more reliably suppress magnetic saturation near the axial end of the tooth main body portion 11B1.

For example, by ensuring a larger surface area of the faces where the main teeth 11B and the additional teeth 11C face each other in the circumferential or radial direction, the magnetic resistance of the faces where the main teeth 11B and the additional teeth 11C face each other in the circumferential or radial direction can be made relatively small. Also, by providing a material with a higher magnetic resistance than the main teeth 11B and the additional teeth 11C between the faces where the main teeth 11B and the additional teeth 11C face each other in the axial direction, the magnetic resistance of the faces where the main teeth 11B and the additional teeth 11C face each other in the circumferential or radial direction can be made relatively small. The material with a higher magnetic resistance than the main teeth 11B and the additional teeth 11C is, for example, an adhesive with a relatively high magnetic resistance.

[Motor application examples]
Next, a specific application example of the motor 1 according to this embodiment will be described with reference to FIG.

FIG. 21 is a diagram showing an example of an air conditioner 100 equipped with a motor 1 according to this embodiment.

The air conditioner 100 (an example of a refrigeration device) includes an outdoor unit 110, an indoor unit 120, and

refrigerant paths

130 and 140. The air conditioner 100 operates a refrigerant circuit made up of the outdoor unit 110, the indoor unit 120, and the

refrigerant paths

130 and 140, and adjusts the temperature, humidity, etc., of the room in which the indoor unit 120 is installed.

The outdoor unit 110 is placed outside the building whose temperature and other conditions are to be adjusted. The outdoor unit 110 is connected to one end of each of the

refrigerant paths

130, 140, and draws in refrigerant from one of the

refrigerant paths

130, 140 and discharges the refrigerant to the other.

The indoor unit 120 is placed in a room of a building where the temperature and other parameters are to be adjusted. The indoor unit 120 is connected to the other end of each of the

refrigerant paths

130, 140, and draws in refrigerant from one of the

refrigerant paths

130, 140 and discharges the refrigerant to the other.

The

refrigerant paths

130, 140 are, for example, constructed of pipes, and connect the outdoor unit 110 and the indoor unit 120 so that the refrigerant can circulate between the outdoor unit 110 and the indoor unit 120.

The outdoor unit 110 includes refrigerant paths L1 to L6, a four-way switching valve 111, a compressor 112, an outdoor heat exchanger 113, an outdoor expansion valve 114, and a fan 115.

Refrigerant paths L1 to L6 are configured, for example, as pipes.

Refrigerant path L1 connects one end of refrigerant path 130 outside the outdoor unit 110 to the four-way switching valve 111.

Refrigerant path L2 connects between the four-way switching valve 111 and the inlet of the compressor 112.

Refrigerant path L3 connects between the four-way switching valve 111 and the outlet of the compressor 112.

Refrigerant path L4 connects the four-way switching valve 111 and the outdoor heat exchanger 113.

Refrigerant path L5 connects the outdoor heat exchanger 113 and the outdoor expansion valve 114.

Refrigerant path L6 connects one end of refrigerant path 140 outside the outdoor unit 110 to the outdoor expansion valve 114.

The four-way switching valve 111 reverses the flow of the refrigerant when the air conditioner 100 is in cooling operation and when it is in heating operation.

When the air conditioner 100 is in cooling operation, the four-way switching valve 111 connects the paths indicated by the solid lines in FIG. 21. Specifically, when the air conditioner 100 is in cooling operation, the four-way switching valve 111 connects between refrigerant path L1 and refrigerant path L2, and between refrigerant path L3 and refrigerant path L4.

On the other hand, when the air conditioner 100 is in heating operation, the four-way switching valve 111 connects the paths indicated by the dotted lines in FIG. 21. Specifically, when the air conditioner 100 is in heating operation, the four-way switching valve 111 connects between refrigerant path L4 and refrigerant path L2, and between refrigerant path L1 and refrigerant path L3.

Compressor 112 draws in refrigerant from refrigerant path L2, compresses it to high pressure, and discharges it into refrigerant path L3. Compressor 112 is equipped (built-in) with motor 1 and is driven by motor 1.

When the air conditioner 100 is in cooling operation, the high-temperature, high-pressure refrigerant compressed by the compressor 112 flows into the outdoor heat exchanger 113 via refrigerant paths L3 and L4.

On the other hand, when the air conditioner 100 is in heating operation, the high-temperature, high-pressure refrigerant compressed by the compressor 112 flows through refrigerant path L3 and refrigerant path L1 into refrigerant path 130 outside the outdoor unit 110. The high-temperature, high-pressure refrigerant then flows into the indoor unit 120 through refrigerant path 130.

The outdoor heat exchanger 113 exchanges heat between the outside air and the refrigerant passing through the interior. Specifically, the outdoor heat exchanger 113 is provided with a fan 115, and the outdoor heat exchanger 113 exchanges heat between the outside air blown by the fan 115 and the refrigerant flowing through the interior.

When the air conditioner 100 is in cooling operation, the outdoor heat exchanger 113 causes the high-temperature, high-pressure refrigerant compressed by the compressor 112, which flows in from the refrigerant path L4, to dissipate heat to the outside air, and causes the condensed and liquefied refrigerant (liquid refrigerant) to flow into the refrigerant path L5.

In addition, when the air conditioner 100 is in heating operation, the outdoor heat exchanger 113 causes the low-temperature, low-pressure liquid refrigerant flowing in from the refrigerant path L5 to absorb heat from the outside air, and causes the evaporated refrigerant to flow into the refrigerant path L4.

When the air conditioner 100 is in heating operation, the outdoor expansion valve 114 is closed to a predetermined opening and reduces the pressure of the refrigerant (liquid refrigerant) flowing in from the refrigerant path L6 to a predetermined pressure. On the other hand, when the air conditioner 100 is in cooling operation, the outdoor expansion valve 114 is fully open and passes the refrigerant (liquid refrigerant) from the refrigerant path L5 to the refrigerant path L6.

As described above, the fan 115 (an example of a blower) blows air to the outdoor heat exchanger 113, promoting heat exchange in the outdoor heat exchanger 113. The fan 115 is equipped with, for example, an impeller 115A and a motor 1, and operates when the impeller 115A is driven by the motor 1.

The indoor unit 120 includes an indoor expansion valve 121, an indoor heat exchanger 122, and a fan 123.

When the air conditioner 100 is in cooling operation, the indoor expansion valve 121 is closed to a predetermined opening and reduces the pressure of the supercooled liquid refrigerant flowing in from the refrigerant path 140 to a predetermined pressure. On the other hand, when the air conditioner 100 is in heating operation, the indoor expansion valve 121 is fully open and allows the refrigerant (liquid refrigerant) flowing out of the indoor heat exchanger 122 to pass toward the refrigerant path 140.

The indoor heat exchanger 122 exchanges heat between the indoor air and the refrigerant passing through it. Specifically, the indoor air is passed around the indoor heat exchanger 122 by the action of the fan 123 mounted in the indoor unit 120, and the indoor air that has exchanged heat with the refrigerant inside the indoor heat exchanger 122 is blown out of the indoor unit 120, thereby cooling or heating the room.

Specifically, when the air conditioner 100 is in cooling operation, the indoor heat exchanger 122 absorbs heat from the indoor air into the low-temperature, low-pressure liquid refrigerant decompressed by the indoor expansion valve 121, thereby lowering the temperature of the indoor air.

On the other hand, when the air conditioner 100 is in heating operation, the indoor heat exchanger 122 causes the high-temperature, high-pressure refrigerant flowing in from the outdoor unit 110 through the refrigerant path 130 to dissipate heat into the indoor air, thereby raising the temperature of the indoor air.

As described above, the fan 123 (an example of a blower) blows air to the indoor heat exchanger 122, and blows the indoor air that has exchanged heat with the refrigerant inside the indoor heat exchanger 122 out to the outside of the indoor unit 120. The fan 123 is equipped with, for example, an impeller 123A and a motor 1, and operates when the impeller 123A is driven by the motor 1.

In addition, the motor 1 may be mounted on one or two of the compressor 112, the fan 115, and the fan 123.

In this way, the motor 1 according to this embodiment can be applied to the compressor 112, fan 115, and fan 123 of the air conditioner 100.

The motor 1 according to this embodiment may also be applied to refrigeration devices other than the air conditioner 100.

[Action]
Next, the operation of the rotating electrical machine according to this embodiment will be described.

In this embodiment, the rotating electric machine includes a rotor and a stator. The rotating electric machine is, for example, the motor 1 described above. The rotor is, for example, the rotor 20 described above. The stator is, for example, the stator 10. Specifically, the rotor is freely rotatable around the rotation axis. The rotation axis is, for example, the rotation axis AX described above. The stator is radially opposed to the rotor. The stator includes an iron core made of a soft magnetic material and a winding. The iron core is, for example, the stator core 11 described above. The winding is, for example, the coil 12 described above. Specifically, the iron core includes a first iron core and a second iron core. The first iron core is, for example, the main tooth 11B described above. The second iron core is, for example, the additional tooth 11C described above. More specifically, the first core has a main body portion that extends in the radial direction and around which the winding is wound, and a first magnetic pole portion that is provided at the tip of the main body portion and faces the rotor in the radial direction. The main body portion is, for example, the above-mentioned teeth main body portion 11B1. The first magnetic pole is, for example, the above-mentioned magnetic pole portion 11B2. The second core has a second magnetic pole portion that is arranged adjacent to the first core in the axial direction and faces the rotor in the radial direction, and a peripheral portion that is connected to or formed integrally with the second magnetic pole portion and is arranged between the first core and the winding in at least one of the radial and circumferential directions. The second magnetic pole portion is, for example, the above-mentioned magnetic pole portion 11C1. The peripheral portion is, for example, the above-mentioned holding portions 11C2, 11C3, and 11C5.

As a result, for example, the second core faces the first core in the radial or circumferential direction at the peripheral portion, and can be magnetically coupled to the first core through the facing surface. Therefore, the rotating electric machine can use the facing surface as a magnetic path for magnetic flux passing between the first and second cores. As a result, the magnetic flux passing between the second magnetic pole portion and the first core passes through the facing surface, making it easier for it to pass not only through the axial end of the first core, but also through points inside the axial end. Therefore, magnetic saturation of the axial end of the first core due to the magnetic flux passing between the second magnetic pole portion and the first core can be suppressed, and the driving force and driving efficiency of the rotating electric machine can be further improved.

In addition, in this embodiment, the first magnetic pole portion may have a flange portion that protrudes circumferentially beyond the circumferential end face of the main body portion. The flange portion is, for example, the flange portion 11B3 described above. The peripheral portion may be disposed between the flange portion and the winding.

As a result, for example, the second core is magnetically coupled to the first core through the opposing surface at the periphery that faces the flange in the radial direction, and as a result, the rotating electric machine can use the opposing surface as a magnetic path for magnetic flux passing between the first and second cores.

In addition, in this embodiment, the peripheral portion may be disposed between the main body portion and the winding.

As a result, for example, the second core is magnetically coupled to the first core through an opposing surface that faces the main body in the circumferential direction at the peripheral portion, and as a result, the rotating electric machine can use the opposing surface as a magnetic path between the first core and the second core.

In this embodiment, the rotating electric machine includes a rotor and a stator. The rotating electric machine is, for example, the motor 1 described above. The rotor is, for example, the rotor 20 described above. The stator is, for example, the stator 10. Specifically, the rotor is freely rotatable around the rotation axis. The rotation axis is, for example, the rotation axis AX described above. The stator is radially opposed to the rotor. The stator includes an iron core made of a soft magnetic material and a winding. The iron core is, for example, the stator core 11 described above. The winding is, for example, the coil 12 described above. Specifically, the iron core includes a first iron core and a second iron core. The first iron core is, for example, the main tooth 11B described above. The second iron core is, for example, the additional tooth 11C described above. More specifically, the first core has a main body portion that extends in the radial direction and around which the winding is wound, and a first magnetic pole portion that is provided at the tip of the main body portion and faces the rotor in the radial direction. The main body portion is, for example, the above-mentioned teeth main body portion 11B1. The first magnetic pole is, for example, the above-mentioned magnetic pole portion 11B2. The second core has a second magnetic pole portion that is arranged adjacent to the first core in the axial direction and faces the rotor in the radial direction, and a peripheral portion that is connected to or formed integrally with the second magnetic pole portion. The second magnetic pole portion is, for example, the above-mentioned magnetic pole portion 11C1. The peripheral portion is, for example, the above-mentioned holding portions 11C2, 11C3, and 11C5. The peripheral portion has an opposing surface that faces the first core in the radial direction or circumferential direction. The first core and the second core have a magnetic path through the opposing surfaces between the second magnetic pole portion and the first core.

As a result, the rotating electric machine can utilize the opposing surfaces that face each other in the circumferential and radial directions as a magnetic path for the magnetic flux passing between the first and second iron cores. Therefore, by passing through the opposing surfaces, the magnetic flux passing between the second magnetic pole portion and the first iron core is more likely to pass not only through the axial end of the first iron core, but also through points inside the axial end. This suppresses magnetic saturation of the axial end of the first iron core caused by the magnetic flux passing between the second magnetic pole portion and the first iron core, and further improves the driving force and driving efficiency of the rotating electric machine.

In addition, in this embodiment, the first magnetic pole portion may have a flange portion that protrudes circumferentially beyond the circumferential end face of the main body portion. The flange portion is, for example, the flange portion 11B3 described above. The opposing surface may include a surface where the peripheral portion and the flange portion face each other in the radial direction.

As a result, the rotating electric machine can utilize the radially opposing surfaces between the flange portion and the peripheral portion as a magnetic path for magnetic flux passing between the first iron core and the second iron core.

In addition, in this embodiment, the opposing surfaces may include surfaces where the peripheral portion and the main body portion face each other in the circumferential direction.

As a result, the rotating electric machine can utilize the circumferentially opposing surfaces between the main body and the peripheral portion as a magnetic path for the magnetic flux passing between the first and second iron cores.

In addition, in this embodiment, the second magnetic pole portion may be disposed adjacent to only one of the axial ends of the first iron core.

This allows, for example, the second iron core including the second magnetic pole portion and the peripheral portion to be assembled to the first iron core by bringing the second iron core closer to the first iron core from the other end side where the second magnetic pole portion is not provided.

In addition, in this embodiment, the second magnetic pole portions may be disposed adjacent to both axial ends of the first iron core.

This allows the rotating electric machine to ensure that the area of the stator corresponding to the magnetic poles that face radially opposite the rotor is relatively large.

In addition, in this embodiment, the axial dimension of the peripheral portion may be longer than the axial dimension of the second magnetic pole portion.

As a result, the magnetic attraction force acting on the second magnetic pole portion due to the magnetic force of the rotor's permanent magnets can reduce the force that the peripheral portion located between the first iron core and the windings exerts on the first iron core and the windings.

In addition, in this embodiment, the axial dimension of the portion of the peripheral portion adjacent to the first iron core in the circumferential or radial direction may be the same as the axial dimension of the first iron core.

As a result, the rotating electric machine can utilize the opposing surfaces between the first and second iron cores, which cover the entire axial direction of the first iron core, as a magnetic path for the magnetic flux passing between the first and second iron cores. Therefore, the magnetic flux passing between the second magnetic pole portion and the first iron core passes through the opposing surfaces, making it easier to pass through the entire axial direction of the first iron core. This further suppresses magnetic saturation of the axial end of the first iron core caused by the magnetic flux passing between the second magnetic pole portion and the first iron core, and further improves the driving force and driving efficiency of the rotating electric machine.

In addition, in this embodiment, the area of the surface where the first iron core and the second iron core face each other in the circumferential or radial direction may be larger than the area of the surface where the first iron core and the second iron core face each other in the axial direction.

As a result, for example, the peripheral portion can be positioned between the first iron core and the winding, thereby maintaining the position of the second iron core (second magnetic pole). Also, by ensuring that the axial dimension of the peripheral portion is relatively long, the area of the peripheral portion facing the first iron core in the radial or circumferential direction becomes relatively large, and as a result, the position of the second iron core can be maintained while relatively reducing stress.

In addition, in this embodiment, the magnetic resistance between the surfaces of the first iron core and the second iron core that face each other in the circumferential or radial direction may be smaller than the magnetic resistance between the surfaces of the first iron core and the second iron core that face each other in the axial direction.

As a result, the magnetic flux passing between the second magnetic pole portion and the first iron core is more likely to flow through the circumferentially or radially opposing surfaces between the first iron core and the second iron core than through the axially opposing surfaces between the first iron core and the second iron core. This makes it possible to more reliably suppress magnetic saturation of the axial end of the first iron core caused by the magnetic flux passing between the second magnetic pole portion and the first iron core, and more reliably improve the driving force and driving efficiency of the rotating electric machine.

Although the embodiments have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims.

Finally, this application claims priority based on Japanese Patent Application No. 2022-158317, filed on September 30, 2022, the entire contents of which are incorporated herein by reference.

1 Motor 10 Stator 11 Stator core 11A Yoke 11Aa Convex portion 11B Main teeth 11B1 Teeth body portion 11B2 Magnetic pole portion 11B3 Flange portion 11B4 Hole portion 11Ba Concave portion 11C Additional teeth 11C1 Magnetic pole portion 11C2 Holding portion 11C3 Holding portion 11C4 Holding portion 11C5 Holding portion 11C6 Holding portion 12 Coil 20 Rotor 30 Shaft 100 Air conditioner 110 Outdoor unit 111 Four-way switching valve 112 Compressor 113 Outdoor heat exchanger 114 Outdoor expansion valve 115 Fan 115A Impeller 120 Indoor unit 121 Indoor expansion valve 122 Indoor heat exchanger 123 Fan 123A Impeller 130 Refrigerant path 140 Refrigerant path AX Rotation axis C6 Holding portion L1 Coolant path L2 Coolant path L3 Coolant path L4 Coolant path L5 Coolant path L6 Coolant path

Claims

A rotor configured to be freely rotatable about a rotation axis;
a stator radially opposed to the rotor,
The stator includes an iron core made of a soft magnetic material and a winding,
The core includes a main body portion extending in a radial direction and around which the winding is wound, a first core having a first magnetic pole portion provided at a tip of the main body portion and facing the rotor in the radial direction, a second magnetic pole portion disposed adjacent to the first core in the axial direction and facing the rotor in the radial direction, and a second core having a peripheral portion connected to or formed integrally with the second magnetic pole portion and disposed between the first core and the winding in the radial or circumferential direction.
Rotating electric motor.
the first magnetic pole portion includes a flange portion that protrudes in a circumferential direction from a circumferential end surface of the main body portion,
The peripheral portion is disposed between the flange portion and the winding.
The rotating electric machine according to claim 1 .
The peripheral portion is disposed between the main body portion and the winding.
3. A rotating electric machine according to claim 1 or 2.
A rotor configured to be rotatable about a rotation axis;
a stator facing the rotor in a radial direction,
The stator includes an iron core made of a soft magnetic material and a winding.
The iron core includes a main body portion extending in a radial direction and around which the winding is wound, a first iron core provided at a tip of the main body portion and having a first magnetic pole portion radially facing the rotor, and a second iron core arranged adjacent to the first iron core in the axial direction and having a second magnetic pole portion radially facing the rotor, and a peripheral portion connected to or formed integrally with the second magnetic pole portion,
the peripheral portion has an opposing surface that faces the first iron core in a radial direction or a circumferential direction,
the first iron core and the second iron core have a magnetic path between the second magnetic pole portion and the first iron core through the opposing surfaces;
Rotating electric motor.
the first magnetic pole portion includes a flange portion that protrudes in a circumferential direction from a circumferential end surface of the main body portion,
The opposing surface includes a surface where the peripheral portion and the flange portion face each other in a radial direction.
The rotating electric machine according to claim 4.
The opposing surface includes a surface where the peripheral portion and the main body portion oppose each other in the circumferential direction.
6. A rotating electric machine according to claim 4 or 5.
the second magnetic pole portion is disposed adjacent to only one of both axial ends of the first iron core;
The rotating electric machine according to any one of claims 1 to 6.
the second magnetic pole portions are disposed adjacent to both ends of the first iron core in the axial direction,
The rotating electric machine according to any one of claims 1 to 6.
The axial dimension of the peripheral portion is longer than the axial dimension of the second magnetic pole portion.
The rotating electric machine according to any one of claims 1 to 8.
The axial dimension of the peripheral portion adjacent to the first iron core in the circumferential direction or the radial direction is the same as the axial dimension of the first iron core.
The rotating electric machine according to any one of claims 1 to 9.
an area of a surface where the first iron core and the second iron core face each other in a circumferential or radial direction is larger than an area of a surface where the first iron core and the second iron core face each other in an axial direction;
The rotating electric machine according to any one of claims 1 to 10.
a magnetic resistance between surfaces of the first iron core and the second iron core facing each other in a circumferential or radial direction is smaller than a magnetic resistance between surfaces of the first iron core and the second iron core facing each other in an axial direction;
A rotating electric machine according to any one of claims 1 to 11.
A rotating electric machine according to any one of claims 1 to 12 is mounted on the rotating electric machine.
Compressor.
A rotating electric machine according to any one of claims 1 to 12 is mounted on the rotating electric machine.
Blower.
A rotating electric machine according to any one of claims 1 to 12 is mounted on the rotating electric machine.
Refrigeration equipment.