KR100709301B1 - Two or four poles rotor structure and design method of synchronous reluctance motor manufactured by anisotropy material - Google Patents

Abstract

)를 감소시켜 회전자의 q 축의 인덕턴스를 감소시키고 d축의 인덕턴스를 증가시키도록 구성된 2극 또는 4극 단편형 동기 릴럭턴스 회전자구조를 구현하므로 2극 또는 4극 단편형 동기 릴럭턴스 전동기의 토크 및 역률을 향상시키는데 그 특징이 있다.The present invention relates to a motor rotor structure in which the torque and power factor of the motor is improved by increasing the inductance of the d- axis while reducing the q- axis inductance by using an anisotropic material as the material of the fragmentary synchronous reluctance motor rotor. More specifically, the present invention uses an anisotropic material as the material of the motor rotor to reduce the inductance of the q- axis while increasing the torque and power factor of the two-pole or four-pole fragmentary synchronous reluctance motor that increased the inductance of the d- axis It is related to the structure, and the leakage magnetic flux flowing in the rotor lip part using anisotropic material rather than isotropic material as the rotor material of the fragmentary synchronous reluctance motor (

Torque in a two or four pole piece synchronous reluctance motor by implementing a two pole or four pole piece synchronous reluctance rotor structure configured to reduce the q- axis inductance of the rotor and increase the inductance of the d- axis. And improving the power factor.

Motor rotor, anisotropic material

Description

Two or Four Poles Rotor Structure and Design Method of Synchronous Reluctance Motor Manufactured by Anisotropy Material}

1: Structure of anisotropic material for manufacturing a two-pole fragment type synchronous reluctance motor rotor according to the present invention

2: Rotor structure of a two-pole fragment type synchronous reluctance motor using an anisotropic material according to the present invention

Figure 3: Side view of the direction of the magnetic flux and the lip when the rotor is made of an anisotropic material according to the invention

4 is an anisotropic material structure showing an orientation of a magnetic field formed in a four-pole fragment type synchronous reluctance motor rotor according to the present invention.

5 is a cross-sectional view of a rotor structure of a four-pole fragment type synchronous reluctance motor designed and manufactured using an anisotropic material according to the present invention.

6: Variable ( W ) and direction of change for the shape change of the magnetic flux barrier of the rotor of the fragmentary synchronous reluctance motor according to the present invention

<Brief Description of Drawings>

11; 2-pole fragment type synchronous reluctance motor rotor

12; Segments made of anisotropic materials

13; Magnetic Barrier (gauge) of 2-pole single-piece synchronous reluctance motor rotor

21; Center of magnetic field 22; d axis

23; q axis 24; 4-pole Motor Rotor Outer Diameter (Wonju)

25; Shape of 4-pole rotor material with anisotropic materials

26; Square connecting the center of magnetic field

31; 4-pole single-piece synchronous reluctance motor rotor

32; Magnetic barriers (voids) formed on 4-pole single-piece synchronous reluctance motor rotors

33; d axis 34; q axis

The present invention improves the torque and power factor of the motor by manufacturing the material of the synchronous reluctance motor rotor of the short-type synchronous reluctance motor by increasing the inductance of the d- axis while reducing the inductance of the q- axis by using an anisotropic material of 2-pole or 4-pole. Motor rotor structure.

Conventionally, a fragmentary synchronous reluctance motor (SYNRM) is composed of an isotropic metallic material, and is classified into an axial stratification type and a lateral stratification type according to the stratification method. In the case of the die, the pore ratio increases, but it is more difficult to manufacture than the lateral stratification type such as the complicated structure and the problem of fixing the rotor core to the axis.In case of applying magnetic flux, the inductance value of the d axis increases and the inductance of the q axis The value of is reduced or hardly generated so that there is a limit to improve the torque and power factor of the motor and there is a problem that the manufacturing cost is high.

In addition, the piece-type SynRM corresponding to the lateral stratification is relatively easy to manufacture, and can improve torque ripple caused by the slots of the stator using skew, and designed to have a high breakthrough ratio no less than an axial stratification structure. It is widely used because it can be manufactured, but the torque and power factor of the motor rotor is affected by a number of variables such as the number of magnetic flux barriers, the width of magnetic flux barriers, magnetic barriers, slots and ribs, which are variables affecting motor characteristics. Because of this difference, it is not easy to design and manufacture the optimized rotor, and when designing the rotor with isotropic material, the inductance value in the d direction increases and the value of the inductance in the q axis decreases or hardly occurs. There is a problem.

The technical problem to be achieved by the present invention is to solve the problem of the prior art as described above to solve the problem, to improve the power factor and torque of the motor rotor in the design of the short-type synchronous reluctance motor q-axis leakage while reducing the magnetic flux to or configured to not substantially occur to minimize the q-axis self-inductance value of d-axis two-pole, the value of the self-inductance so as to increase or piece-synchronization of the four-pole reluctance electric opportunity designing electronic material anisotropically The purpose of the present invention is to realize a motor rotor structure with greatly improved power factor and torque of the motor.

Yet another object of the present invention is to design and manufacture the anisotropic metal material having a 2-pole or 4-pole fragmentary synchronous reluctance motor, and in the case of 2-pole, the number of segments of the rotor made of anisotropic material. Is composed of an odd number, and a magnetic barrier is formed between the segments to design and manufacture so that the segment can be located at the center.In the case of 4-pole, the rotor having the desired size is formed in anisotropically forming material. In the structure where four center points of the magnetic field having the same intensity on the outer diameter (circumference) are formed at the corners of the square, the magnetic barrier is formed on the q- axis to minimize the magnetic inductance while maximizing the magnetic inductance on the d- axis. It is to achieve a rotor structure that greatly improves the torque and power factor of a fragmentary synchronous reluctance motor.

Another object of the present invention is to further increase the magnetic inductance of the d- axis in a structure in which the four poles of the magnetic field having the same intensity on the circumference of the four-pole electric motor rotor to be designed are formed at the corners of the square Due to the q-axis to form a magnetic barrier self to the number in as a q-axis forming a magnetic barrier, using the finite element method and successively unconstrained minimization techniques flux barriers (flux barrier) formed by the air in order to minimize the inductance, the whole The ratio of the width of the magnetic flux barrier to the width of the entire core area ( Kw ) is a variable and optimized design to achieve a rotor structure that further improves the torque and power factor of the synchronous reluctance motor.

The present invention uses a two-pole or four-pole anisotropic material as the material of the short-acting synchronous reluctance motor rotor to manufacture a rotor structure that increases the inductance in the d-direction while reducing the q- axis inductance, thereby improving torque and power factor of the motor. It relates to an improved motor rotor structure.

Conventionally, a fragmentary synchronous reluctance motor (SYNRM) is composed of an isotropic metallic material, and is classified into an axial stratification type and a lateral stratification type according to the stratification method. In case of mold, the pore ratio increases, but it is more difficult to manufacture than the lateral stratification type such as the complicated structure and the problem of fixing the rotor core to the axis.In case of applying magnetic flux, the inductance value in the d direction is Increasing and reducing the value of the inductance of the q- axis is configured to decrease or hardly occur, there is a limit to improve the torque and power factor of the motor and there is a problem that the manufacturing cost is high.

In addition, the piece-type SynRM corresponding to the lateral stratification is relatively easy to manufacture, and can improve torque ripple caused by the slots of the stator using skew, and designed to have a high breakthrough ratio no less than an axial stratification structure. It is widely used because it can be manufactured, but the torque and power factor of the motor rotor is affected by a number of variables such as the number of magnetic flux barriers, the width of magnetic flux barriers, magnetic barriers, slots and ribs, which are variables affecting motor characteristics. Because of this difference, it is not easy to design and manufacture the optimized rotor, and when designing the rotor with isotropic material, the inductance value in the d direction increases and the value of the inductance in the q axis decreases or hardly occurs. There is a problem.

The present invention has been made in view of the problems of the prior art as described above. It looks at the drawings to facilitate the understanding of the present invention. 1 illustrates a structure of an anisotropic material for manufacturing a two-pole fragment synchronous reluctance motor rotor according to the present invention, Figure 2 is a two-pole fragment synchronous reluctance motor using an anisotropic material according to the present invention It shows the rotor structure. Figure 3 shows a side view of the granules in the direction in which magnetic flux (Magnetic Flux) flows when the rotor is made of an anisotropic material according to the present invention. Figure 4 shows the structure of an anisotropic material showing the direction of the magnetic field (Magnetic Field) formed for designing and manufacturing a four-pole fragment type synchronous reluctance motor rotor according to the present invention, Figure 5 is Fig. 1 shows a cross-sectional view of the rotor structure of a four pole piece synchronous reluctance motor designed and manufactured using anisotropic materials. Figure 6 shows the variable W and the direction of change for the shape change of the magnetic flux barrier of the rotor of the fragmentary synchronous reluctance motor according to the present invention.

(수식1)를 감소시켜 q축 인덕턴스를 크게 줄이고, d축 인덕턴스를 크게 증가시켜 전동기의 토크와 역률을 증가시킨다. 전동기회전자를 등방성 재질로 구성할 경우에는 도3에서 보는 것과 같이 누설자속(

)이 회전자의 립 부분으로 흐르게 되어 식 (3)의 뒷부분 (

)이 증가하여 q축 인덕턴스를 증가시켜 토크 및 역률이 감소하는 현상이 나타난다. 이러한 점을 착안하여 본 발명에서는 단편형 동기 릴럭턴스 전동기(SynRM)의 회전자를 이방성 재질(도1)로 구성하여 도3의 누설자속(

)이 흐르지 못하거나 아주 미세하게 흐르도록 구성하여 L_q 를 크게 줄이고, d 축은 회전자표면으로 흐르는 자속을 증가시켜 d축의 자기 인덕턴스 값을 증가시켜 전동기의 토크와 역률을 향상시킬 수 있으며, 회전자 립 부분을 다소 넓게 형성할 수 있어 구조적으로 회전자를 견고하게 할 수 있다.The components of the two-pole or four-pole fragmentary synchronous reluctance motor rotor according to the present invention will be described in detail. First, the components of the rotor of the two-pole fractional synchronous reluctance motor will be described. In the configuration of the anisotropic material for constituting the rotor of the two-pole fragment type synchronous reluctance motor, the magnetic flux in the d direction is strong and the magnetic flux in the q direction is weak as shown in FIG. One example of a rotor manufactured by manufacturing a segment of the rotor using the anisotropic material as described above and forming a magnetic barrier between the segments is illustrated in FIG. 2. Leakage flux flowing in the rotor rip (Rib) part when the rotor material of the two-pole fragment type synchronous reluctance motor according to the present invention is designed and manufactured using an anisotropic material rather than an isotropic material

By reducing Equation 1, the q- axis inductance is greatly reduced, and the d- axis inductance is greatly increased to increase the torque and power factor of the motor. When the motor rotor is made of isotropic material, as shown in FIG.

) Flows into the lip of the rotor,

) Increases to increase the q- axis inductance, resulting in a decrease in torque and power factor. With this in mind, in the present invention, the rotor of the fragmentary synchronous reluctance motor (SynRM) is composed of an anisotropic material (FIG. 1), and the leakage magnetic flux of FIG.

) Are not, or configured to a very fine flow significantly reduce the L _q flow, d axis is time to increase the magnetic flux flowing in the electron surface to increase the self-inductance value of d-axis can improve the torque and power factor of the electric motor, the rotor The lip portion can be made somewhat wider to structurally solidify the rotor.

(1)

(One)

(2)

(2)

(3)

(3)

(4)

(4)

)을 최소화할 수 있도록 d축과 q축 인덕턴스의 차(L_d-L_q )와 돌극비(L_d/L_q )를 최대한 크게 할 수 있도록 이방성 재질을 사용하여 구성하고, 필요한 수의 자기장벽의 가진 2극 또는 4극 단편형 동기 릴럭턴스 전동기(SynRM)의 회전자를 구성한다.In the present invention, the rotor of the 2-pole or 4-pole single-piece synchronous reluctance motor (SynRM) is composed of anisotropic materials, but the inductance of the d- axis and the q- axis inductance of the motor rotor are calculated by the finite element method in Equation (4). From this, the difference between the d- axis and q- axis inductance ( L _d -L _q ) and the pole-pole ratio ( L _d / L _q ) of the designed motor rotor is obtained and designed and manufactured. That is, the latter part of equation (3)

To minimize the difference between the d- axis and q- axis inductance ( L _d -L _q ) and the pole-pole ratio ( L _d / L _q ) to minimize the The rotor consists of a two-pole or four-pole fragmentary synchronous reluctance motor (SynRM).

The configuration of the rotor of the four-pole fragmental synchronous reluctance motor (SynRM) made of an anisotropic material according to the present invention will be described. Figure 4 shows the direction of the magnetic field (Magnetic Field) of the anisotropic material formed to constitute the rotor of the four-pole fragment type synchronous reluctance motor according to the present invention. More specifically, the square corner of the magnetic field (Magnetic Field) having the same intensity on the rotor outer diameter (circumference) for forming the rotor of the four-pole fractional synchronous reluctance motor to be designed as shown in FIG. Four are formed in the design and fabrication of anisotropic materials for the four-pole motor rotor. The anisotropic material for the 4-pole motor rotor designed as described above has a magnetic barrier on the q- axis so as to minimize the magnetic inductance ( L _q ) of the q- axis while further increasing the magnetic inductance ( L _d ) of the d- axis shown in FIG. 5. The finite element method and the sequential unconstrained minimization method are used to define the number of flux barriers formed by air and the ratio of the width of the total magnetic flux barrier to the width of the total core area ( Kw ). In order to achieve the optimal design, the rotor structure is improved to improve the torque and power factor of the fragmentary synchronous reluctance motor. It looks at a specific embodiment according to the present invention.

EXAMPLES

Example 1

)이 흐르지 못하거나 아주 미세하게 흐르게 되어 L_q 를 크게 감소시키고, 상기와 같이 형성한 이방성재질의 특성상 d 축의 인덕턴스(L_d )가 증가하여 토크와 역률이 크게 향상된 전동자회전자를 구성할 수 있고, 회전자 립 부분을 다소 넓게 형성할 수 있어 구조적으로 회전자를 견고하게 제작할 수 있다. A detailed embodiment of a rotor of a two-pole fragment type synchronous reluctance motor according to the present invention will be described based on the drawings. In general, the rotor must be designed and manufactured to satisfy two conditions. One should be designed so blurred across the electrode surface of the rotor d-axis magnetic flux to obtain a larger inductance than the d-axis. And one must be configured so that the q-axis magnetic flux can minimize the self-inductance q axis. In order to satisfy the above two conditions, the material of the segment constituting the rotor 11 of the two-pole fragment type synchronous reluctance motor is composed of an anisotropic material (Fig. 1). As shown in FIG. 1, the material composed of the anisotropic material is configured such that the magnetic flux in the d-direction is strong and the magnetic flux in the q-direction is weak. One example of a rotor in which the segment 12 of the rotor is made of the above anisotropic material (FIG. 1) and the magnetic barrier 13 is formed between the segments is shown in FIG. The difference between the inductance of the d- axis and the q-axis ( L _d -L ) as the segment 12 made of anisotropic materials and the number 13 of magnetic barriers existing between the segments increases for designing and manufacturing the motor rotor according to the present invention. _q ) and (the ratio ( L _d / L _q ) is increased to meet the rotor design conditions, but there is a limit to increase the number of segments and the magnetic barrier 13, it is preferable to limit to an appropriate number, segment ( The number of 12 is formed to be an odd number so that the segment 12 is positioned at the center of the rotor, as described above, when the rotor of the fragmentary synchronous reluctance motor (SynRM) is made of anisotropic material (Fig. 1). Leakage flux of Figure 3

) Can not flow or very fine flow and L _q is greatly reduced, and the inductance ( L _d ) of the d- axis increases due to the characteristics of the anisotropic material formed as described above can form a rotor rotor with significantly improved torque and power factor As a result, the rotor lip portion can be formed slightly wider, so that the rotor can be manufactured in a rigid structure.

That is, the rotor structure of the two-pole short type synchronous reluctance motor according to the present invention is provided with a predetermined number of segments of a weak anisotropy material the d-axis magnetic flux strong and q-axis magnetic flux to improve the power factor and the torque of the motor, q A magnetic barrier is formed between the segments to reduce the leakage magnetic flux of the shaft. The number of segments is formed as many as possible in consideration of the size of the rotor, it is formed in an odd number so that the segment is located in the center.

Example 2

A detailed embodiment of a rotor of a four-pole fragment type synchronous reluctance motor (SynRM) made of an anisotropic material according to the present invention will be described based on the drawings. 4 shows four concentric circles indicating the direction of an anisotropic magnetic field formed to constitute a rotor of a four-pole fragment type synchronous reluctance motor according to the present invention. More specifically, the center point 21 of the magnetic field having the same intensity on the outer diameter 24 (circumference) for forming the rotor of the 4-pole fragment synchronous reluctance motor to be designed as shown in FIG. A rotor anisotropic material 25 of four-pole fragmentary synchronous reluctance motor (SynRM) formed with four at the corners of the square 26 is designed and manufactured. The motor rotor is made of a material of the anisotropic rotor manufactured as described above, the magnetic inductance L _q of the q axis 34 shown in FIG. 5 is minimized, and the magnetic inductance L _d of the d axis 33 is minimized. The number of flux barriers formed by air using the finite element method and the sequential unconstrained minimization technique (SUMT) in forming the magnetic barrier along the q axis 34 to further increase the The ratio between the width of the total magnetic flux barrier and the width of the total core area is determined. Equation (3) is seen in the center of the d- axis and q- axis of the motor rotor in Figure 5

(5)

(5)

It can be expressed as Equation (5).

In order to satisfy the two requirements necessary for the design of the motor rotor in the first embodiment as described above through Equation (4) and (5), the magnetic inductance value of the d- axis 33 can be made as large as possible. It is necessary to induce magnetic flux to flow to the rotor pole surface, and to minimize leakage magnetic flux to the q axis 34 so as to reduce the value of magnetic inductance as much as possible. To achieve this, as well as configuring the motor rotor from the anisotropic material 25 having a magnetic field having four center circles 21 as shown in Figure 4, as well as the magnetic flux barrier (32, Flux barrier) formed by the air The number and the ratio of the total flux barrier width and the total width of the core area ( Kw ) are variables, and the design and fabrication are optimized by using the finite element method and the sequential nonconstrained minimization technique. A rotor structure with improved power factor can be achieved. The ratio Kw between the width of the total magnetic flux barrier and the width of the total core area is

(6)

(6)

; 전체 자속 장벽의 폭here,

; Width of total flux barrier

; 전체 철심 영역의 폭

; The width of the entire iron core area

It is expressed by equation (6).

In the present invention, the magnetic inductance value was obtained by using the Finite Element Method (FEM), which has the advantage of accurately analyzing the nonlinearity of a motor and a complicated shape. The formula for calculating the magnetic flux of each phase is as follows.

(7)

(7)

Where L _c is the primary stacking width

N wound on stator coil turns

A ₁ and A ₂ are magnetic vector potentials in the slots of the rotor shaft.

Equation (7) is used to find the linkage magnetic flux in each phase and then tensor (Tensor) transformation to calculate the magnetic flux on the d and q axes, respectively. Similarly, after calculating the d and q- axis components using the Tensor transformation, the inductance value is calculated by Equation (4). Changing the width and area of the magnetic flux barrier in the 1/4 model of the rotor in Fig. 6 by calculating the Kw value at the maximum value of the calculated difference between the d- axis and q- axis inductance ( L _d -L _q ). Pairs of variables (W1, W10), (W2, W9), (W3, W8), (W4, W7), (W5, W6), (P1, P2), (P3, P4) Design and manufacture the rotor of motor by changing the position of (P5, P6), (P7, P8), (P9, P10) }.

The rotor structure of the four-pole single-piece synchronous reluctance motor according to the present invention is designed to obtain anisotropic materials with strong magnetic flux on the d- axis 33 and weak magnetic flux on the q- axis 34 to improve the power factor and torque of the motor. In consideration of the diameter of the rotor to form a four concentric circular magnetic field, the rotor having a size of a circumference passing through the center 21 of the four concentric circles in the anisotropic material in which the four concentric magnetic flux is formed formation, and to reduce the magnetic force of the anisotropic material transmission opportunity q axis of electrons (34 in Fig. 5) formed of a formed on a q-axis connecting the center of the concentric center (21 4) and the rotor It is composed of a magnetic barrier (32). The number and width of magnetic barriers formed on the rotor on the q- axis connecting the centers of the four concentric circles (21 in FIG. 4) where the magnetic fluxes are formed increases the magnetic inductance value of the d- axis 33 It has a structure to reduce the magnetic inductance value of the q- axis.

FIG. 6 is a view showing a 1/4 model of a rotor for optimal design of a motor rotor using an anisotropic material for a rotor of a four-pole fragment type synchronous reluctance motor (SynRM).

The anisotropic material formed as shown in FIG. 4 is a constant constant for the number of slots of the stator (for example, 24), the magnetic barrier (for example, 0.4 mm), and the lip according to the model of the four-pole fragmentary synchronous reluctance motor. In step 6, the parameters required to change the width and area of the magnetic flux barrier in the 1/4 model of the rotor in Fig. 6 are represented by { (W1, W10), (W2, W9), (W3, W8), (W4, W7), (W5, W6), (P1, P2), (P3, P4), (P5, P6), (P7, P8), (P9, P10) } Symmetrically about the q axis Finding the maximum value of ( L _d -L _q ) by the finite element method based on the above formula, changing the maximum value of ( L _d -L _q ), and calculating the maximum value from the maximum value. Anisotropy is obtained by calculating the Kw value defined in Equation (6) by a sequential non-constrained minimization technique and determining the number of magnetic flux barriers and the width of the total magnetic flux barrier based on the calculated Kw values. Rotor design of 4-pole piece-piece SynRM consists of material.

Based on the Kw value computed by the sequential non-constrained minimization technique, the variables of FIG. 6 { (W1, W10), (W2, W9), (W3, W8), (W4, W7), (W5, W6), Determine the optimum values of (P1, P2), (P3, P4), (P5, P6), (P7, P8), (P9, P10) } to obtain the optimum motor rotor structure with improved power factor and torque .

The rotor structure of the 4-pole fragment SynRM formed of the anisotropic material designed based on the W value and the P value obtained from the optimum Kw value obtained by the rotor design method of the 4-pole fragment SynRM made of the anisotropic material is also the present invention. It is within the scope of protection.

The present invention is designed to reduce or hardly occur the leakage flux of the q- axis of the motor rotor in order to improve the power factor and torque of the motor in the design of the short-type synchronous reluctance motor to minimize the q- axis magnetic inductance value of the d- axis By designing and manufacturing a 2-pole or 4-pole motor rotor with anisotropic materials to increase the value of magnetic inductance, the power factor and torque of the motor are greatly improved.

Another effect of the present invention is to configure the rotor of the two-pole or four-pole fragmentary synchronous reluctance motor of anisotropic metal material, in the case of two poles of the number of segments of the rotor made of anisotropic material to an odd number In the case of 4 poles, the rotor of the desired size is the same on the circumference. In the structure where four center points of the magnetic field with intensity are formed at the corners of the square, the magnetic barrier is formed on the q axis to minimize the magnetic inductance, and the magnetic inductance on the d axis is maximized to reduce the torque and power factor of the synchronous reluctance motor. To greatly improve.

Another effect of the present invention is to minimize the magnetic inductance by forming a magnetic barrier along the q- axis in a structure in which four center points of a magnetic field having the same intensity on the circumference are formed at the corners of the square on the circumference In order to further increase the magnetic inductance of the d- axis, the number of flux barriers formed by air using the finite element method and the sequential unconstrained minimization technique in forming the q- axis, and the width of the total magnetic flux barrier It is to improve the torque and power factor of the fragmentary synchronous reluctance motor by optimizing and designing the ratio ( Kw ) of the width of the total core area as a variable.

Claims (7)

In the rotor structure of a two-pole fractional synchronous reluctance motor, A certain number of segments made of anisotropic materials with strong magnetic flux on the d- axis and weak magnetic flux on the q- axis to construct a rotor for improving the power factor and torque of the motor, Rotor structure made of anisotropic materials consisting of magnetic barriers formed between the segments to reduce the leakage magnetic flux of the q- axis. The method according to claim 1, The number of segments is formed in as many as possible in consideration of the size of the rotor, the rotor structure is made of an anisotropic material formed in an odd number so that the segment is located in the center. In the rotor structure of a four-pole fractional synchronous reluctance motor, Means for forming four concentric magnetic fields in consideration of the outer diameter of the rotor to be designed to obtain anisotropic materials having strong magnetic fluxes on the d- axis and weak magnetic fluxes on the q- axis to improve the power factor and torque of the motor; Means for forming a rotor having a size of a circumference passing through the centers of four concentric circles in the anisotropic material in which the four concentric circular magnetic fields are formed; And a rotor structure made of an anisotropic material having at least one magnetic flux barrier on the q axis connecting the center of the concentric circle and the center of the rotor to reduce the leakage magnetic flux of the q axis of the motor rotor formed of the anisotropic material. The method according to claim 3, The number and width of magnetic barriers formed in the rotor on the q- axis connecting the centers of the four concentric circles and the rotor where the magnetic field is formed increases the magnetic inductance value of the d- axis and decreases the magnetic inductance value of the q- axis. Rotor structure made of anisotropic materials. In the rotor design method of the 4-pole fractional synchronous reluctance motor using finite element method and sequential unconstrained minimization technique, Inputting the number of slots, the magnetic barrier and the lip of the stator according to a model of the short-phase synchronous reluctance motor to be designed with a constant value; And the step of magnetic flux d-axis q-axis magnetic flux is strong, it is considering the diameter of the rotor to be designed in order to obtain a weakly anisotropic material formed of the four concentric magnetic field in order to improve the power factor and the torque of the motor, Forming an electric motor rotor having a size of a circumference passing through the centers of the four concentric circles in the anisotropic material in which the four concentric magnetic fields are formed; In the 1/4 model of the formed fragmentary synchronous reluctance motor rotor, the parameters ( W , P ) necessary to change the width and area of the magnetic flux barrier are symmetrically changed with respect to the ( q ) axis and are applied to the finite element method. Finding a value at which the difference ( L _d -L _q ) between the di ( d ) direction inductance value and the gyu (q) direction inductance is maximum; The ratio ( Kw ) of the width of the total magnetic flux barrier and the width of the total core area is sequentially determined at a value at which the difference ( L _d -L _q ) between the di ( d ) direction inductance value and the quartz (q) direction inductance becomes maximum. Computing with the constraint minimization technique, The calculated total magnetic flux barrier width and the whole core region width ratio (Kw) value on by a rotor of a flux barrier fragment type synchronous reluctance motor once with anisotropic material made of a step of determining the number and width of the Electronic design method.

The method according to claim 5, In the 1/4 model of the fragment type synchronous reluctance motor rotor, the number of variables ( W , P ) necessary to change the width and the area of the magnetic flux barrier is composed of a pair, and the variable as the number of magnetic flux barriers increases. A method of designing a fractional synchronous reluctance motor rotor with anisotropic material which is solved by sequential unconstrained minimization techniques by increasing ( W , P ). A fragmented synchronous reluctance motor rotor structure having anisotropic materials designed and manufactured by an anisotropic material by the rotor design method of the fragmentary synchronous reluctance motor of claim 5.

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