KR102509568B1 - Rotor of line start synchronous reluctacne motor with q-axis slot structure for improving power characteristic - Google Patents

Abstract

It relates to a rotor of a line-started synchronous reluctance motor with an improved q-axis slot structure in consideration of output characteristics. direction, a plurality of barriers including a first barrier disposed closest to the circumference and a second barrier disposed closest to the shaft hole, a plurality of first slots facing both ends of each of the plurality of barriers, Among the plurality of first slots, a second slot positioned between two first slots located at both ends of the first barrier is included, the barrier includes a body portion, a first connection portion, and a second connection portion; , The first connection part and the second connection part are located at both ends of the body part, and the angle formed by the body part and the first connection part and the body part and the second connection part is 90 degrees or more, and the second slot It includes a slot body portion, a first slot connection portion, and a second slot connection portion, and the first slot connection portion and the second slot connection portion are positioned at both ends of the slot body portion to have a shape similar to that of the barrier, and the slot body portion and An angle between the first slot connection portion, the slot body portion, and the second slot connection portion may be 90 degrees or more.

Description

Rotor of line-started synchronous reluctance motor with improved q-axis slot structure considering output characteristics

The present invention relates to a rotor of a line start synchronous reluctance motor, and more particularly, to a line start synchronous reluctance motor that improves output characteristics by improving a q-axis slot structure. It's about the rotor.

In general, a line-started synchronous reluctance motor is a motor using the principle that rotational force is generated by a change in magnetic resistance according to the rotation of a rotor, and is widely used in industrial applications such as fans and pumps. A rotor of a line-started synchronous reluctance motor has a rotor slot filled with a plurality of barriers and conductors.

When the rotor is started, the flow of magnetic flux is hindered by the barrier, so that the direction between each barrier group, that is, the d-axis magnetic resistance is different in the direction of the barrier, that is, the q-axis and the circumferential direction of the rotor. Reluctance torque is generated by the difference in magnetic resistance of the d-axis. Since the reluctance torque is synchronized with the magnetic flux of the stator, the rotor rotates at a synchronous speed by the reluctance torque.

In general, the output of a line-started synchronous reluctance motor is determined by the number and structure of barriers, but the number, thickness, and the like of barriers are limited by the number, thickness, and depth of rotor slots. In particular, there is a problem in that the number of barriers is limited by the number of rotor slots and has limitations in output characteristics.

One object of the present invention is to provide a rotor of a line-started synchronous reluctance motor in which the number of barriers is improved by breaking away from the shape of a conventional induction motor.

Another object of the present invention is to provide a rotor of a line-started synchronous reluctance motor with improved salient pole ratio and output characteristics.

The problem to be solved by the present invention is not limited to the above-mentioned problems, and problems not mentioned will be clearly understood by those skilled in the art from this specification and the accompanying drawings. .

According to one aspect of the present invention, a rotor of a line-driven synchronous reluctance motor having a shaft hole formed in the center is disposed in a circumferential direction around the shaft hole, and a first barrier disposed closest to the circumference and the shaft A plurality of barriers including a second barrier disposed closest to the hole, a plurality of first slots facing both ends of each of the plurality of barriers, located at both ends of the first barrier among the plurality of first slots A second slot positioned between the two first slots, wherein the barrier includes a body portion, a first connection portion, and a second connection portion, wherein the first connection portion and the second connection portion are provided at both ends of the body portion. The angle formed by the body portion and the first connection portion and the body portion and the second connection portion is 90 degrees or more, and the second slot includes a slot body portion, a first slot connection portion, and a second slot connection portion, The first slot connection portion and the second slot connection portion are positioned at both ends of the slot body portion to have a shape similar to that of the barrier, and the slot body portion, the first slot connection portion, and the slot body portion and the second slot connection portion are positioned at both ends of the slot body portion. The formed angle may be 90 degrees or more.

The solutions to the problems of the present invention are not limited to the above-described solutions, and solutions not mentioned will be clearly understood by those skilled in the art from this specification and the accompanying drawings. You will be able to.

According to the present invention, it is possible to provide a rotor of a line-started synchronous reluctance motor in which the shape of an existing induction motor is broken and the number of barriers is improved.

According to the present invention, a rotor of a line-started synchronous reluctance motor with improved salient pole ratio and output characteristics can be provided.

Effects of the present invention are not limited to the above-mentioned effects, and effects not mentioned will be clearly understood by those skilled in the art from this specification and the accompanying drawings.

1 is a view for explaining a line-driven synchronous reluctance motor having a rotor according to the prior art.
2 is a view for explaining a rotor of a line-started synchronous reluctance motor according to the prior art.
3 is a view for explaining a rotor of a line-started synchronous reluctance motor according to an embodiment.
4 is a view for explaining a rotor of a line-started synchronous reluctance motor according to another embodiment.
FIG. 5 is a view for explaining a line-started synchronous reluctance motor having a rotor according to the structure of FIG. 3 .
FIG. 6 is a diagram showing results obtained by comparing analysis results for a rotor of a conventional line-started synchronous reluctance motor according to the structure of FIG. 3 using a finite element analysis technique.

The foregoing objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. However, the present invention can apply various changes and can have various embodiments. Hereinafter, specific embodiments will be illustrated in the drawings and described in detail.

If it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, numbers (eg, first, second, etc.) used in the description process of this specification are only identification symbols for distinguishing one component from another component. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.

When a component is referred to as being connected or connected to another component, it may be directly connected or connected to the other component, but it may be understood that another component may exist in the middle. .

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions may include plural expressions unless the context clearly dictates otherwise.

In this specification, terms such as include or include should not be construed as necessarily including all of the various components or steps described in the specification, and some of the components or steps may not be included. and may further include additional elements or steps.

In addition, components having the same function within the scope of the same idea appearing in the drawings of each embodiment are described using the same reference numerals.

The spirit of the present invention is not limited to the presented embodiments, and those skilled in the art who understand the spirit of the present invention may add, change, delete, etc. other elements within the scope of the same spirit, through other degenerate inventions or the spirit of the present invention. It will be possible to easily suggest other embodiments included within the scope of, but it will also be said to be included within the scope of the present invention.

According to one aspect of the present invention, in the rotor of a line-driven synchronous reluctance motor having a shaft hole formed at the center, a first barrier disposed in a circumferential direction around the shaft hole and disposed closest to the circumference and a plurality of barriers including a second barrier disposed closest to the shaft hole, a plurality of first slots facing both ends of each of the plurality of barriers, and both ends of the first barrier among the plurality of first slots. and a second slot located between two first slots located on the body, the barrier includes a body, a first connection and a second connection, wherein the first connection and the second connection are provided on the body. It is located at both ends, and the angle formed by the body portion and the first connection portion and the body portion and the second connection portion is 90 degrees or more, and the second slot includes the slot body portion, the first slot connection portion, and the second slot connection portion. The first slot connection part and the second slot connection part are located at both ends of the slot body part to have a shape similar to that of the barrier, and the slot body part and the first slot connection part and the slot body part and the second slot connection part are located at both ends of the slot body part. An angle formed by the slot connection portion may be 90 degrees or more.

The slot body portion may be disposed at a predetermined distance from the circumference, and the first slot connection portion may be disposed in a direction toward the circumference of the rotor from one end of the slot body portion.

The second slot connection part may be disposed in a direction from the other end of the slot body toward the circumference of the rotor.

A conductor may be inserted into the first slot and the second slot.

Ends of the first slot connection portion and the second slot connection portion not connected to the slot body portion may be formed to be rounded.

The second slot may be located on a q-axis that is an axis crossing the center of the barrier.

Below, with reference to the drawings, the configuration of the rotor of the above-described line-started synchronous reluctance motor will be described.

1 is a view showing a line-started synchronous reluctance motor according to the prior art, and FIG. 2 is a view showing a rotor of the line-started synchronous reluctance motor according to the prior art.

Referring to FIGS. 1 and 2, the rotor 90 of the line-driven synchronous reluctance motor according to the prior art has a circular shape with a shaft hole 100 formed in the center, centering on the shaft hole 100. A plurality of barriers 200 are disposed in the circumferential direction, and the barriers 200 are composed of a body part 203, a first connection part 201, and a second connection part 202.

The first connection part 201 and the second connection part 202 are connected to both ends of the body part 203 at an angle of 90 degrees or more and have ends extending to the vicinity of the circumference of the rotor 90 .

The barrier 200 may be penetrated in the axial direction of the rotor 90 and filled with air therein.

When a rotating magnetic field is formed in the stator, the barrier 200 as described above generates a flow of magnetic flux between the stator and the rotor 90 by magnetizing the rotor 90 by the rotating magnetic field. increase the magnetic resistance.

It can be seen that the rotor slot 300 is disposed in a radial direction along the circumference adjacent to the first connection part 201 and the second connection part 202 .

Some of the rotor slots 300 are q-axis outermost slots 300a located on the q-axis, which is an axis crossing the center of the barrier 200 .

The line-started synchronous reluctance motor according to the structure of FIGS. 1 and 2 may have a problem in that the number of barriers 200 is limited by the number of rotor slots 300 .

3 is a cross-sectional view showing a rotor structure of a line-started synchronous reluctance motor including a second slot having a shape similar to a barrier according to an embodiment of the present invention.

The rotor 91 of the shown line-started synchronous reluctance motor faces a plurality of barriers 40 disposed in the circumferential direction around the shaft hole 100 and both ends of each of the plurality of barriers 40 Bo includes a plurality of first slots 30 and a second slot 20 having a shape similar to that of the barrier 40 .

The barrier 40 may include a first barrier 40a disposed closest to the circumference and a second barrier 40b disposed closest to the shaft hole 100 .

The barrier 40 may be penetrated in the axial direction of the rotor 90 and filled with air therein.

Such a barrier 40, when a rotating magnetic field is formed in the stator, the rotor 90 is magnetized by the rotating magnetic field and a flow of magnetic flux is generated between the stator and the rotor 90. increase the magnetic resistance.

As shown in the enlarged view of FIG. 3 , the barrier 40 may include a body part 43 , a first connection part 41 and a second connection part 42 .

The first connection part 41 and the second connection part 42 are connected to both ends of the body part 43, and the angle formed by the first connection part 41 and the body part 43 and the second An angle formed between the connection part 42 and the body part 43 may be 90 degrees or more.

The first slots 30 may be radially arranged along the circumference.

The second slot 20 may be located between two first slots 30 located at both ends of the first barrier 40a among the plurality of first slots 30 .

The second slot 20 may be located in the q-axis, which is a direction crossing the center of the barrier 40 .

As shown in the enlarged drawing of FIG. 3 , the second slot 20 may include a slot body 23 , a first slot connection unit 21 and a second slot connection unit 22 .

The first slot connection part 21 and the second slot connection part 22 are connected to both ends of the slot body part 23, and the first slot connection part 21 and the slot body part 23 form The angle and the angle between the second slot connection part 22 and the slot body part 23 may be 90 degrees or more. Accordingly, the second slot 20 as a whole may have a shape similar to that of the barrier 40 .

Ends of the first slot connection portion 21 and the second slot connection portion 22 that are not connected to the slot body portion 23 may be rounded.

The slot body portion 23 may be disposed at a predetermined distance from the circumference.

The first slot connection part 21 may be disposed in a direction toward the circumference of the rotor 91 at one end of the slot body part 23 .

The second slot connection part 22 may be disposed in a direction toward the circumference of the rotor 91 at the other end of the slot body part 23 .

The first slot 30 and the second slot 20 may be filled with a conductor such as aluminum or copper.

4 is a rotor structure of a line-started synchronous reluctance motor including a second slot disposed in a direction in which a first connection portion and a second connection portion of a barrier extend, rather than in a radial direction, according to an embodiment of the present invention. is a cross-sectional view showing

Referring to FIG. 4 , the rotor 92 of the shown line-driven synchronous reluctance motor includes a plurality of barriers 40 disposed in the circumferential direction around the shaft hole 100 and each of the barriers 40 It includes a plurality of first slots 50 facing both ends and a second slot 20 having a shape similar to that of the barrier 40.

The barrier 40 may include a first barrier 40a disposed closest to the circumference and a second barrier 40b disposed closest to the shaft hole 100 .

The barrier 40 may be penetrated in the axial direction of the rotor 92 and filled with air therein.

As shown in the enlarged view of FIG. 4 , the barrier 40 may include a body part 43 , a first connection part 41 and a second connection part 42 .

The first connection part 41 and the second connection part 42 are connected to both ends of the body part 43, and the angle formed by the first connection part 41 and the body part 43 and the second An angle formed between the connection part 42 and the body part 43 may be 90 degrees or more.

The first slot 50 adjacent to the first connection part 41 may be disposed in a direction in which the first connection part 41 extends.

The first slot 50 adjacent to the second connection part 42 may be disposed in a direction in which the second connection part 42 extends.

The first slot 50 is arranged in a direction in which the first connection part 41 and the second connection part 42 of the barrier 40 extend, instead of in a radial direction, so that a gap between the barrier 40 and the first slot 50 is formed. Since the magnetic flux path of is the same, salient pole ratio and output characteristics can be improved.

The second slot 20 may be positioned between two first slots 50 positioned at both ends of the first barrier 40a among the plurality of first slots 50 .

The second slot 20 may be located in the q-axis, which is a direction crossing the center of the barrier 40 .

As shown in the enlarged drawing of FIG. 4 , the second slot 20 may include a slot body 23 , a first slot connection unit 21 and a second slot connection unit 22 .

The first slot connection part 21 and the second slot connection part 22 are connected to both ends of the slot body part 23, and the first slot connection part 21 and the slot body part 23 form The angle and the angle between the second slot connection part 22 and the slot body part 23 may be 90 degrees or more.

Accordingly, the second slot 20 as a whole may have a shape similar to that of the barrier 40 .

Ends of the first slot connection portion 21 and the second slot connection portion 22 that are not connected to the slot body portion 23 may be rounded.

The slot body portion 23 may be disposed at a predetermined distance from the circumference.

The first slot connection part 21 may be disposed in a direction toward the circumference from one end of the slot body part 23 .

The second slot connection part 22 may be disposed in a direction toward the circumference from the other end of the slot body part 23 .

The first slot 50 and the second slot 20 may be filled with a conductor such as aluminum or copper.

5 is a view showing a line-started synchronous reluctance motor including a rotor having the structure of FIG. 3 according to an embodiment of the present invention.

Referring to the drawings, the line-driven synchronous reluctance motor according to FIG. 5 includes a plurality of barriers 40 disposed in a circumferential direction around a shaft hole 100 and both ends of each of the plurality of barriers 40 and It may include a rotor including a plurality of first slots 30 facing each other and a second slot 20 having a shape similar to that of the barrier 40 .

According to FIG. 5, the barrier 40, the first slot 30, and the second slot 20 are divided into 4 equal parts at 90 degrees from the center of the rotor: first equal parts, second equal parts, third equal parts, and fourth equal parts. Arranged in the same form, each in equal parts.

The line-started synchronous reluctance motor according to FIG. 5 can all have improved output, salient pole ratio, efficiency, and power factor compared to the line-started synchronous reluctance motor according to the prior art of FIG. 1 .

FIG. 6 is a diagram showing a comparison result of analysis results for a line-driven synchronous reluctance motor having a rotor according to the conventional structure of FIG. 1 and a rotor according to the structure of FIG. 3 using finite element analysis techniques; .

6 is a result of analyzing output characteristics based on a 7.5kW line-started synchronous reluctance motor.

According to the structure of FIG. 3 , it can be seen that the output has been improved from 7.61 [kW] to 7.62 [kW] compared to the prior art.

According to the structure of FIG. 3 , it can be seen that the salient pole ratio, which is the ratio of q-axis inductance to d-axis inductance, is improved from 6.64 to 7.54 compared to the prior art.

According to the structure of FIG. 3 , it can be seen that the conventional flight efficiency has improved from 94.45 [%] to 94.67 [%] and the power factor has improved from 76.29 [%] to 77.54 [%].

This is due to the fact that the q-axis inductance is reduced by substantially increasing the number of barriers as the second slot has a shape similar to that of the barrier.

That is, it can be seen that the second slot having the shape of the barrier as shown effectively reduces the q-axis inductance to improve the salient pole ratio and efficiency.

As described above, although the embodiments have been described with limited examples and drawings, those skilled in the art can make various modifications and variations from the above description. For example, the described techniques may be performed in an order different from the method described, and/or the components of the described system, structure, device, circuit, etc. may be combined or combined in a different form than the method described, or other components may be used. Or even if it is replaced or substituted by equivalents, appropriate results can be achieved.

Therefore, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims.

Claims (6)

In the rotor of a line-started synchronous reluctance motor in which a shaft hole is formed in the center,
a plurality of barriers disposed in a circumferential direction around the shaft hole and including a first barrier disposed closest to the circumference and a second barrier disposed closest to the shaft hole;
A plurality of first slots facing opposite ends of each of the plurality of barriers, a second slot located between two first slots located at both ends of the first barrier among the plurality of first slots; include,
The barrier includes a body portion, a first connection portion, and a second connection portion, wherein the first connection portion and the second connection portion are positioned at both ends of the body portion, and the body portion, the first connection portion, and the body portion and the second connection portion are positioned at both ends of the body portion. 2 The angle formed by the connecting part is 90 degrees or more,
The second slot includes a slot body portion, a first slot connection portion, and a second slot connection portion, and the first slot connection portion and the second slot connection portion are positioned at both ends of the slot body portion to have a shape similar to that of the barrier, An angle between the slot body and the first slot connection portion and between the slot body portion and the second slot connection portion is 90 degrees or more,
The plurality of first slots are disposed at a predetermined distance from the first connection part and the second connection part of each of the plurality of barriers, but not in a direction extending from the first connection part and the second connection part of each of the plurality of barriers. arranged in a radial direction
The rotor of a line-started synchronous reluctance motor.
According to claim 1,
The slot body portion is disposed at a predetermined distance from the circumference, and the first slot connection portion is disposed in a direction toward the circumference of the rotor from one end of the slot body portion.
The rotor of a line-started synchronous reluctance motor.
According to claim 2,
The second slot connection portion is disposed in a direction from the other end of the slot body toward the circumference of the rotor
The rotor of a line-started synchronous reluctance motor.
According to claim 1,
A conductor is inserted into the first slot and the second slot.
The rotor of a line-started synchronous reluctance motor.
According to claim 1,
Ends of the first slot connection portion and the second slot connection portion that are not connected to the slot body portion are rounded.
The rotor of a line-started synchronous reluctance motor.
According to claim 1,
The second slot is located on the q-axis, which is an axis crossing the center of the barrier
The rotor of a line-started synchronous reluctance motor.

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