JP7300974B2 - Rotor of synchronous reluctance motor and synchronous reluctance motor - Google Patents

Description

The present application relates to a synchronous reluctance motor rotor and a synchronous reluctance motor.

In the rotor of a synchronous reluctance motor, which is operated using reluctance torque, narrowing the bridge width on the outer periphery of the rotor improves the magnetic characteristics and torque, but on the other hand, the mechanical strength of the rotor core against centrifugal force decreases. There is a trade-off relationship that it will decrease. As a means of solving this tradeoff, for example, as in Patent Document 1, a dovetail groove shape is provided in the rotor core slit (flux barrier slit) and filled with resin, so that the inside and outside of the rotor core are made of non-magnetic materials ( For example, a method has been proposed in which the bridge width is narrowed and the mechanical strength is ensured.

Japanese Patent Application Laid-Open No. 2002-095227 (summary, FIG. 1)

In a rotating electrical machine such as that disclosed in Patent Document 1, the flux barrier slits must always be filled with a non-magnetic material (for example, resin) in order to secure the mechanical strength of the rotor. In order to fill the non-magnetic material, a non-magnetic material filling device is required, and the manufacturing process is complicated due to resin injection. Furthermore, there is a problem that the mass of the rotor increases, which hinders weight reduction, and the inertia of the rotor increases, degrading the controllability.

The present application discloses a technique for solving the above problems, and a synchronous reluctance motor that can be manufactured by a simple manufacturing process while ensuring the mechanical strength of the rotor, and is lightweight and excellent in controllability. and a synchronous reluctance motor.

A rotor of a synchronous reluctance motor disclosed in the present application is a rotor of a synchronous reluctance motor, and a rotor core of the rotor includes a first core piece made of an electromagnetic steel sheet and a second core made of an electromagnetic steel sheet. have a piece
The first core piece has a plurality of first flux barrier slits formed at equal intervals in the circumferential direction so as to protrude radially inward in an arc shape, and arranged at intervals in the radial direction. ,
The second core piece has a plurality of second flux barrier slits formed at equal intervals in the circumferential direction so as to protrude radially inward in an arc shape, and arranged at intervals in the radial direction. ,
the first core piece has a first coupling portion protruding radially inward into the first flux barrier slit;
the second core piece has a second coupling portion protruding radially outward into the second flux barrier slit;
The first flux barrier slit and the second flux barrier slit are laminated in the axial direction to form a flux barrier section,
The first core piece and the second core piece, which are adjacent to each other in the axial direction of the rotor core, are separated from each other in the radial direction of the rotor core by a connecting portion connecting the first connecting portion and the second connecting portion. and fixed in the axial direction of the rotor core.
Further, a synchronous reluctance motor disclosed in the present application includes a stator having a stator core and coils wound around teeth of the stator core;
and a rotor of the synchronous reluctance motor, the outer peripheral surface of which faces the inner peripheral surface of the stator.

According to the rotor of the synchronous reluctance motor and the synchronous reluctance motor disclosed in the present application, the synchronous reluctance motor can be manufactured by a simple manufacturing process while ensuring the mechanical strength of the rotor, and is lightweight and excellent in controllability. rotor and synchronous reluctance motor.

1 is a schematic half-sectional front view of a synchronous reluctance motor according to Embodiment 1. FIG. 1 is a schematic half-sectional front view of a synchronous reluctance motor according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view perpendicular to the axial direction of a synchronous reluctance motor as a comparative example; 2 is a plan view of a rotor core according to Embodiment 1; FIG. 4 is an enlarged plan view of a main part of core pieces forming odd-numbered laminations from one end in the axial direction of the rotor core according to Embodiment 1. FIG. FIG. 2 is an enlarged plan view of a main portion of core pieces forming an even-numbered lamination from one end in the axial direction of the rotor core according to Embodiment 1; FIG. 4 is a plan view showing a state in which continuous core pieces are superimposed in the axial direction; FIG. 4 is a plan view showing a state in which continuous core pieces are joined according to Embodiment 1; FIG. 5D is a cross-sectional view taken along line GG of FIG. 5D; FIG. 8 is a plan view of a rotor core according to Embodiment 2; FIG. 8 is an enlarged plan view of a main part of core pieces forming odd-numbered laminations from one end in the axial direction of the rotor core according to Embodiment 2; FIG. 8 is an enlarged plan view of a main part of core pieces forming an even-numbered lamination from one end in the axial direction of the rotor core according to Embodiment 2; FIG. 10 is a plan view showing a state in which continuous core pieces according to Embodiment 2 are axially overlapped and joined; FIG. 7C is a cross-sectional view taken along line GG of FIG. 7C; FIG. 11 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 3; FIG. 11 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 3; FIG. 11 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 4; FIG. 11 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 4; FIG. 11 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 5; FIG. 11 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 5; FIG. 11 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 6; FIG. 11 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 6; FIG. 11 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 7; FIG. 11 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 7; FIG. 14 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 8; FIG. 14 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 8; FIG. 20 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 9; FIG. 20 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 9; FIG. 20 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 9; FIG. 20 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 10; FIG. 20 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 10; FIG. 20 is a plan view of a rotor core of a synchronous reluctance motor according to Embodiment 10;

Embodiment 1.
Hereinafter, the rotor of the synchronous reluctance motor and the synchronous reluctance motor according to Embodiment 1 will be described with reference to the drawings.
In addition, in each drawing, the same code|symbol is attached|subjected to the same or equivalent part. In addition, in this specification, the terms "circumferential direction", "radial direction", "axial direction", "inner side", "outer side", and "peripheral" refer to the rotor of the synchronous reluctance motor. "Circumferential", "Radial", "Axial", "Inner", "Outer" and "Peripheral".

FIG. 1 is a half cross-sectional front view of a synchronous reluctance motor 100. FIG.
A synchronous reluctance motor 100 includes a housing 11 consisting of a bottomed cylindrical frame 12 and a bracket 13 closing an opening of the frame 12, a stator 20 fitted inside the cylindrical portion of the frame 12, and a frame 12. and the center of the bracket 13 via the bearing 14 so as to be rotatable around the axis 33 of the rotating shaft, and the outer peripheral surface of the rotor is arranged so as to face the inner peripheral surface of the stator 20 30.

FIG. 2 is a schematic front view of the synchronous reluctance motor 100B in a cross section on one side.
A synchronous reluctance motor 100B is a modification of the synchronous reluctance motor 100. FIG. The housing 11B is composed of a cylindrical frame 12B open at both ends in the axial direction, and two brackets 13 closing the respective openings. Other configurations are the same as those of the synchronous reluctance motor 100 .

FIG. 3 is a sectional view perpendicular to the axial direction of a synchronous reluctance motor 100A as a comparative example. However, the frame 12 is not shown.

The stator 20A includes a stator core 21A including a plurality of teeth 21a arranged at equal intervals in the circumferential direction and a back yoke 21b connecting all the teeth 21a at the outer periphery, and a stator core 21A wound around each tooth 21a. The stator coil 22 is composed of a

The stator core 21A is formed in a cylindrical shape by laminating a plurality of magnetic thin plates (mainly silicon steel plate core pieces) having the same cross-sectional shape as the stator core 21A shown in FIG. 3 in the axial direction. The plurality of thin plates are joined integrally by a method such as welding of the outer peripheries (not shown) or caulking between laminations. The stator coil 22 is supplied with alternating current from an AC power supply (for example, an inverter) (not shown) and generates a rotating magnetic field.

A rotor iron core 31A of the rotor 30A has a plurality of flux barrier portions 32A inside to block magnetic flux 41 that is ineffective for rotation and allow magnetic flux 40 that is effective for rotation to pass through. The flux barrier portions 32A are slits penetrating in the axial direction, and are formed at equal intervals in the circumferential direction so as to protrude radially inward of the rotor 30A in an arc shape. A plurality of layers of flux barrier portions 32A are arranged at intervals in the radial direction for each pole of the rotor 30A. In FIG. 3, four layers of the flux barrier portion 32A are provided.

Similar to the stator core 21A, the rotor core 31A is formed into a cylindrical shape by laminating a plurality of magnetic thin plates (core pieces) having the same cross-sectional shape as the rotor 30A shown in FIG. 3 in the axial direction. It is The plurality of thin plates are integrally joined together by a method such as welding of the outer peripheries (not shown) or caulking between laminations, and a rotating shaft penetrating through the central portion is inserted and fixed.

Due to the plurality of flux barrier portions 32A provided in the rotor core 31A, the rotor core 31A is formed with a d-axis 42 in which magnetic flux is difficult to flow and a q-axis 43 in which magnetic flux easily flows. .

As described above, when an alternating current is supplied to the stator coil 22 from an AC power supply (not shown), a magnetic field is generated in the stator 20A. Also, the polarity of the magnetic field generated by the stator coil 22 generates magnetic flux through the magnetic path 44 formed within the rotor core 31A.

The magnetic flux passing through the magnetic path 44 circulates through the arch-shaped portion 34A sandwiched between the plurality of flux barrier portions 32A of the rotor core 31A, the teeth 21a of the stator core 21A, and the back yoke 21b. The polarity of the magnetic field produced by the stator coil 22 changes in the direction of rotation of the rotor 30A due to the alternating current supplied from the power supply. The rotor 30A rotates around the axis 33 of the rotating shaft by reluctance torque generated by attracting the magnetic rotor core 31A to the poles of the magnetic field.

FIG. 4 is a plan view of rotor core 31 according to the first embodiment.
5A to 5E are diagrams showing manufacturing steps of the rotor core 31. FIG.
The rotor 30 must have mechanical strength to withstand centrifugal force during rotation.
Therefore, the rotor core 31 is provided with one connecting portion 35 that reinforces the strength in the radial direction at the circumferential central portion (position overlapping the d-axis 42) of each flux barrier portion 32 .
FIG. 5A is an enlarged plan view of a main part of a core piece 31a (first core piece) forming an odd-numbered lamination from one end in the axial direction of the rotor core 31, and an enlarged view of a portion marked with a circle A1 in FIG. It is a diagram.
FIG. 5B is an enlarged plan view of a main portion of a core piece 31b (second core piece) forming an even-numbered lamination from one end in the axial direction of the rotor core 31, and an enlarged view of the portion marked with a circle A1 in FIG. It is a diagram.

The core pieces 31a and 31b are provided with flux barrier slits 32a (first flux barrier slits) and flux barrier slits 32b (second flux barrier slits), which are portions that form the flux barrier portion 32 when laminated, respectively. ing.
As shown in FIG. 5A, the core piece 31a has a coupling portion 35a (first coupling portion) protruding radially inward into the flux barrier slit 32a. In addition, as shown in FIG. 5B, the core piece 31b has a coupling portion 35b (second coupling portion) protruding radially outward into the flux barrier slit 32b.

The joint portion 35a and the joint portion 35b are provided with tapered portions 35at and 35bt, respectively, whose distal ends widen in the radial direction. That is, the radially inner tip of the connecting portion 35a of the core piece 31a widens radially inward, and the radially outer tip of the connecting portion 35b of the core piece 31b expands radially outward. The width in the circumferential direction is widened.

FIG. 5C is a plan view showing a state in which the core pieces 31a and 31b are superimposed in the axial direction.
FIG. 5D is a plan view showing a state in which the core pieces 31a and 31b are joined.
FIG. 5E is a cross-sectional view taken along line GG of FIG. 5D.

As shown in FIGS. 5A to 5D, crimped portions K are provided at the root portions of the connecting portions 35a and 35b. The core pieces 31a and 31b laminated in the axial direction are fixed to each other by the caulking portion K, and both circumferential ends of the tapered portions 35at and 35bt at the tips of the coupling portions 35a and 35b, which do not overlap in the axial direction, are axially aligned. , fold in the same direction. At this time, the length L in the axial direction of the bent portion is set to twice or less than the plate thickness of the core pieces 31a and 31b.

By bending the tapered portions 35at and 35bt in the axial direction in this manner, the core pieces 31a and 31b that are axially adjacent to each other are axially and radially coupled at the center position of the flux barrier portion 32 in the circumferential direction. It is fixed and the mechanical strength of the rotor core 31 can be ensured. Note that the core pieces 31a and 31b may be alternately laminated, and the shapes of the even and odd numbers may be either.

Electromagnetic steel sheets for manufacturing motor core pieces are usually coated with an insulating coating on both the front and back sides of the thin sheet for magnetic insulation. However, there is no insulating coating on the cut surface of the core piece punched from this electromagnetic steel sheet. Therefore, when the punched surfaces of the laminated core pieces come into contact with each other, they are magnetically connected to form a magnetic circuit in the axial direction, resulting in increased loss and deterioration of magnetic properties.

However, in the structure in which the tapered portions 35at and 35bt are bent as described above, when the core pieces 31a and 31b adjacent in the axial direction come into contact with each other, the surfaces coated with the insulation coating are bent and come into contact with the sections without the insulation coating. do. Therefore, the core pieces 31a and 31b constituting each lamination are kept magnetically separated, and can be fixed to each other in the radial direction and the axial direction without degrading the magnetic properties. .

In addition, since the bending process is carried out in the core pieces 31a and 31b in the punching die for the core pieces 31a and 31b, the laminations are joined in the core piece dies and discharged in a cylindrical shape. The rotor core 31 can be easily manufactured by the same construction method.

According to the rotor of the synchronous reluctance motor and the synchronous reluctance motor according to the first embodiment, it is possible to provide the rotor of the synchronous reluctance motor and the synchronous reluctance motor which have improved centrifugal force resistance without deteriorating the magnetic characteristics. . Further, it is possible to provide a rotor of a synchronous reluctance motor and a synchronous reluctance motor that can be manufactured by a simple manufacturing process, and that are lightweight and excellent in controllability.

In the present embodiment, four poles and four layers of the flux barrier section 32 are used, but the number of poles and the number of flux barrier sections may be set to arbitrary numbers in consideration of electrical and magnetic characteristics and productivity. good.

Embodiment 2.
Hereinafter, the rotor of the synchronous reluctance motor and the synchronous reluctance motor according to the second embodiment will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 6 is a plan view of rotor core 231 according to the second embodiment.
7A to 7D are diagrams showing the manufacturing process of the rotor core 231. FIG.
As in the first embodiment, in order to increase the strength of the rotor core 31 against centrifugal force, the rotor core 231 has a flux barrier portion 232 at the circumferential center portion (position overlapping the d-axis 42) of each flux barrier portion 232. A connecting portion 235 is provided at one place to reinforce the strength in the radial direction.
FIG. 7A is an enlarged plan view of a main portion of core pieces 231a forming odd-numbered laminations from one end in the axial direction of rotor core 231, and is an enlarged view of a portion marked with circle A2 in FIG.
FIG. 7B is an enlarged plan view of a main portion of the core piece 231b forming an even-numbered lamination from one end in the axial direction of the rotor core 231, and is an enlarged view of the portion marked with a circle A2 in FIG.

The core pieces 231a and 231b are provided with flux barrier slits 232a and 232b, respectively, which are portions that become the flux barrier portion 232 when laminated. As shown in FIG. 7A, the core piece 231a has a connecting portion 235a that protrudes radially outward into the flux barrier slit 232a. Further, as shown in FIG. 7B, the core piece 231b has a connecting portion 235b that protrudes radially inward into the flux barrier slit 232b.

FIG. 7C is a plan view showing a state in which the core pieces 231a and 231b are overlapped in the axial direction and coupled.
FIG. 7D is a cross-sectional view taken along line GG of FIG. 7C.
As shown in FIGS. 7A to 7D, crimped portions K are provided at the tip portions of the connecting portions 235a and 235b. Since the crimped portion K degrades the magnetic properties of that portion, it is desirable to install it in a portion where magnetic flux does not flow.

According to the rotor of the synchronous reluctance motor and the synchronous reluctance motor according to the second embodiment, by providing the crimped portions K in the coupling portions 235a and 235b, the rotor core 231 can be laminated without interfering with the magnetic flux effective for rotation. between can be fixed. Further, since the axially adjacent core pieces 231a and 231b are coupled and fixed in the axial and radial directions at the circumferential center position of the flux barrier portion 232, the synchronous reluctance motor has improved resistance to centrifugal force. rotor and synchronous reluctance motor.

Embodiment 3.
Hereinafter, the rotor of the synchronous reluctance motor and the synchronous reluctance motor according to the third embodiment will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 8 is a plan view of the rotor core 331A of the synchronous reluctance motor.
FIG. 9 is a plan view of the rotor core 331B of the synchronous reluctance motor.
Rotor cores 331A and 331B are modifications of rotor core 31 described in the first embodiment.
In the first embodiment, only one row of connecting portions 35 is arranged on the d-axis 42, but in the present embodiment, a plurality of connecting portions 35 are arranged in one flux barrier portion 332A and one flux barrier portion 332B, and fastening is performed. It improves power and centrifugal force resistance.

In the rotor core 331A shown in FIG. 8, the coupling portion 35 having the same configuration as that of the first embodiment is provided at three points for each flux barrier portion 332A, starting from the position where the outer peripheral surface of the rotor core 331A and the d-axis 42 intersect. They are radially arranged in three rows toward the inner side of the rotor core 331A.
In addition, in the rotor core 331B shown in FIG. 9, the connecting portions 35 are provided at four, three, four, and one connecting portions from the inner side for each flux barrier portion 332B arranged in the radial direction, and alternately arranged in the circumferential direction. are placed. The number and location of the connecting portions 35 may be changed by optimizing the mechanical strength.

Embodiment 4.
Hereinafter, the rotor of the synchronous reluctance motor and the synchronous reluctance motor according to the fourth embodiment will be described with reference to the drawings, focusing on the parts different from the second embodiment.
FIG. 10 is a plan view of the rotor core 431A of the synchronous reluctance motor.
FIG. 11 is a plan view of the rotor core 431B of the synchronous reluctance motor.
Rotor cores 431A and 431B are modifications of rotor core 231 described in the second embodiment.
In the second embodiment, the connecting portions 235 are arranged in one row on the d-axis 42, but in the present embodiment, a plurality of connecting portions 235 are arranged in one flux barrier portion 432A and one flux barrier portion 432B, It improves fastening force and resistance to centrifugal force.

In the rotor core 431A shown in FIG. 10, the connecting portions 235 having the same configuration as in the second embodiment are provided at three points per flux barrier portion 432A, from the position where the outer peripheral surface of the rotor core 331B and the d-axis 42 intersect. They are radially arranged in three rows toward the inner side of the rotor core 331B. Further, in the rotor core 431B shown in FIG. 11, the connecting portions 235 are provided at four, three, four, and one connecting portions from the inner side for each flux barrier portion 432B arranged in the radial direction, and alternately arranged in the circumferential direction. are placed. The number and location of the connecting portions 235 may be changed by optimizing the mechanical strength.

Embodiment 5.
Hereinafter, the rotor of the synchronous reluctance motor and the synchronous reluctance motor according to the fifth embodiment will be described with reference to drawings, focusing on the parts different from the first and fourth embodiments.
FIG. 12 is a plan view of the rotor core 531A of the synchronous reluctance motor.
FIG. 13 is a plan view of the rotor core 531B of the synchronous reluctance motor.
Rotor cores 531A and 531B are modifications of rotor cores 31 and 431A described in the first and fourth embodiments.
In the example of FIG. 12, the connecting portion 35 is not provided in the flux barrier portion 532A on the outermost side. Other configurations are the same as those of the rotor core 31 of the first embodiment.
Further, in the example of FIG. 13, the connecting portion 35 is not provided in the outermost flux barrier portion 532B. The second flux barrier portion 532B from the outer circumference is provided with one connection portion 35, and the two flux barrier portions 532B from the inside are provided with three connection portions 35, respectively. Other configurations are the same as those of the rotor core 431A of the fourth embodiment. In this manner, the mechanical strength of the rotor cores 531A and 531B is optimized by changing the number of connecting portions 35 from 0 to a plurality depending on the circumferential length of the flux barrier portions 532A and 532B. The number and location of the connecting portions 35 may be changed.

Embodiment 6.
Hereinafter, the rotor of the synchronous reluctance motor and the synchronous reluctance motor according to the sixth embodiment will be described with reference to drawings, focusing on the parts different from the second and fourth embodiments.
FIG. 14 is a plan view of the rotor core 631A of the synchronous reluctance motor.
FIG. 15 is a plan view of the rotor core 631B of the synchronous reluctance motor.
Rotor cores 631A and 631B are modifications of rotor cores 31 and 431B described in the first and fourth embodiments.
In the example of FIG. 14, the connecting portion 235 is not provided in the outermost flux barrier portion 632A. Other configurations are the same as those of the rotor core 431B of the fourth embodiment.
In addition, in the example of FIG. 15, the connecting portion 235 is not provided in the outermost flux barrier portion 632B. The second flux barrier portion 632B from the outer circumference is provided with one connection portion 235, and the two flux barrier portions 632B from the inside are provided with two connection portions 235, respectively. Other configurations are the same as those of the rotor core 431B of the fourth embodiment. In this manner, the mechanical strength of the rotor cores 631A, 631B is optimized by changing the number of connecting portions 235 from 0 to a plurality depending on the circumferential length of the flux barrier portions 632A, 632B. The number and location of the connecting portions 235 may be changed.

Embodiment 7.
Hereinafter, the rotor of the synchronous reluctance motor and the synchronous reluctance motor according to the seventh embodiment will be described with reference to the drawings, focusing on the differences from the third embodiment.
FIG. 16 is a plan view of the rotor core 731A of the synchronous reluctance motor.
FIG. 17 is a plan view of the rotor core 731B of the synchronous reluctance motor.
A rotor core 731A is a modification of the rotor core 331A described in the third embodiment.
Rotor core 731B is a modification of rotor core 331B described in the third embodiment.

Both of the rotor cores 731A and 731B are opened by removing the bridge portions Br (see FIGS. 8 and 9) that block the circumferential ends of the flux barrier portions 732A and 732B. Therefore, the magnetic flux passing through the bridge portion Br (leakage magnetic flux that is ineffective for rotation) is eliminated, so that the characteristics of the motor can be improved. Instead of deleting all the bridge portions Br, only an arbitrary bridge portion Br may be deleted.

Embodiment 8.
Hereinafter, the rotor of the synchronous reluctance motor and the synchronous reluctance motor according to the eighth embodiment will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 18 is a plan view of the rotor core 831A of the synchronous reluctance motor.
FIG. 19 is a plan view of the rotor core 831B of the synchronous reluctance motor.
Rotor core 831A is a modification of rotor core 431A described in the fourth embodiment.
Rotor core 831B is a modification of rotor core 431B described in the fourth embodiment.

Both of the rotor cores 831A and 831B are opened by removing the bridge portions Br (see FIGS. 10 and 11) that block the circumferential ends of the flux barrier portions 832A and 832B. Therefore, the magnetic flux passing through the bridge portion Br (leakage magnetic flux that is ineffective for rotation) is eliminated, so that the characteristics of the motor can be improved. Instead of deleting all the bridge portions Br, only an arbitrary bridge portion Br may be deleted.

Embodiment 9.
Hereinafter, the rotor of the synchronous reluctance motor and the synchronous reluctance motor according to the ninth embodiment will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 20 is a plan view of the rotor core 931A of the synchronous reluctance motor.
FIG. 21 is a plan view of the rotor core 931B of the synchronous reluctance motor.
FIG. 22 is a plan view of the rotor core 931C of the synchronous reluctance motor.
Rotor core 931A is a modification of rotor core 31 described in the first embodiment.
Rotor core 931B is a modification of rotor core 331A described in the third embodiment.
Rotor core 931C is a modification of rotor core 531B described in the fifth embodiment.
The rotor cores 931A to 931C are arranged on the outer peripheral side of the outermost flux barrier portions 932A, 932B, and 932C, and are arranged radially inward in a portion through which the d-axis 42 of the outer peripheral surface of the rotor cores 931A to 931C passes. A notch Ct recessed in a fan shape is provided. The torque of the synchronous reluctance motor can be improved by notching this portion to make it difficult for the magnetic flux that is ineffective for the rotation of the rotor to pass through.

Embodiment 10.
Hereinafter, the rotor of the synchronous reluctance motor and the synchronous reluctance motor according to the tenth embodiment will be described with reference to the drawings, focusing on the differences from the first embodiment.
FIG. 23 is a plan view of rotor core 1031A of the synchronous reluctance motor.
FIG. 24 is a plan view of rotor core 1031B of the synchronous reluctance motor.
FIG. 25 is a plan view of the rotor core 1031C of the synchronous reluctance motor.
Rotor core 1031A is a modification of rotor core 231 described in the second embodiment.
Rotor core 1031B is a modification of rotor core 431A described in the fourth embodiment.
Rotor core 1031C is a modification of rotor core 631B described in the fifth embodiment.
The rotor cores 1031A to 1031C are arranged on the outer peripheral side of the outermost flux barrier portions 1032A, 1032B, and 1032C, and radially inwardly at the portion through which the d-axis 42 of the outer peripheral surface of the rotor cores 1031A to 1031C passes. A notch Ct recessed in a fan shape is provided. The torque of the synchronous reluctance motor can be improved by notching this portion to make it difficult for the magnetic flux that is ineffective for the rotation of the rotor to pass through.

While this application describes various exemplary embodiments and examples, various features, aspects, and functions described in one or more embodiments may not apply to particular embodiments. can be applied to the embodiments singly or in various combinations.
Therefore, countless modifications not illustrated are envisioned within the scope of the technology disclosed in the present application. For example, modification, addition or omission of at least one component, extraction of at least one component, and combination with components of other embodiments shall be included.

100, 100A, 100B synchronous reluctance motor,
11, 11B housing, 12, 12B housing, 13 bracket,
14 bearing, 20, 20A stator, 21A stator core, 30 rotor,
21A stator core, 21a tooth, 21b back yoke, 22 stator coil, 30A rotor,
31, 31A, 231, 331A, 331B, 431A, 431B, 531A, 531B, 631A, 631B, 731A, 731B, 831A, 831B, 931A, 931B, 931C, 1031A, 1031B, 1031C rotor core,
31a, 31b, 231a, 231b core pieces,
32a, 32b, 232a, 232b flux barrier slits,
32A, 32, 232, 332A, 332B, 432A, 432B, 532A, 532B, 632A, 632B, 732A, 732B, 832A, 832B flux barrier section,
33 axis, 34A arch-shaped portion, 35, 235 connecting portion,
35a, 35b, 235a, 235b coupling portion, 35at tapered portion, 40 magnetic flux, 41 magnetic flux, 42 d-axis, 43 q-axis, 44 magnetic path, Br bridge portion, K caulking portion, Ct notch.

Claims (10)

A rotor for a synchronous reluctance motor, wherein a rotor core of the rotor has a first core piece made of an electromagnetic steel sheet and a second core piece made of an electromagnetic steel sheet,
The first core piece has a plurality of first flux barrier slits formed at equal intervals in the circumferential direction so as to protrude radially inward in an arc shape, and arranged at intervals in the radial direction. ,
The second core piece has a plurality of second flux barrier slits formed at equal intervals in the circumferential direction so as to protrude radially inward in an arc shape, and arranged at intervals in the radial direction. ,
the first core piece has a first coupling portion protruding radially inward into the first flux barrier slit;
the second core piece has a second coupling portion protruding radially outward into the second flux barrier slit;
The first flux barrier slit and the second flux barrier slit are laminated in the axial direction to form a flux barrier section,
The first core piece and the second core piece, which are adjacent to each other in the axial direction of the rotor core, are separated from each other in the radial direction of the rotor core by a connecting portion connecting the first connecting portion and the second connecting portion. and a rotor of a synchronous reluctance motor fixed in the axial direction of the rotor core. 2. The rotor of a synchronous reluctance motor according to claim 1, wherein said first coupling portion and said second coupling portion are coupled by caulking. The first coupling portion has a first tapered portion whose tip widens in the radial direction,
The second coupling portion has a second tapered portion whose tip widens in the radial direction,
3. The rotor for a synchronous reluctance motor according to claim 1, wherein both circumferential ends of said first tapered portion and said second tapered portion are axially bent in the same direction. . 4. The synchronous reluctance motor according to claim 3, wherein the axial length of the portion where the first tapered portion and the second tapered portion are bent in the axial direction is twice or less the plate thickness of the electromagnetic steel plate. rotor. The rotor of a synchronous reluctance motor according to any one of claims 1 to 4, wherein a plurality of said connecting portions are provided for one said flux barrier portion. The rotor of a synchronous reluctance motor according to any one of claims 1 to 5, wherein the connecting portions are arranged alternately in the circumferential direction in the plurality of flux barrier portions arranged in the radial direction. The rotor for a synchronous reluctance motor according to any one of claims 1 to 6, wherein both ends of the flux barrier portion in the circumferential direction are open. 8. The rotor core according to any one of claims 1 to 7, wherein the outermost flux barrier portion of the rotor core has a fan-shaped notch radially inwardly recessed on an outer peripheral side of the flux barrier portion. synchronous reluctance motor rotor. 9. The rotor of a synchronous reluctance motor according to any one of claims 1 to 8, wherein said electromagnetic steel sheets are coated with an insulating coating for magnetic insulation. a stator having a stator core and coils wound around the teeth of the stator core;
A synchronous reluctance motor comprising a rotor of the synchronous reluctance motor according to any one of claims 1 to 9, wherein an outer peripheral surface of the synchronous reluctance motor is disposed so as to face an inner peripheral surface of the stator.

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