WO2019035549A1 - Rotor core assembly - Google Patents

Abstract

The present invention relates to a rotor core assembly, and comprises a steel plate portion which extends in a longitudinal direction of a rotor hub; a magnet portion which passes through the steel plate portion; a pair of first support portions which extend to be symmetrical from one end portion of the steel plate portion in a direction perpendicular to the longitudinal direction of the rotor hub with respect to an imaginary center line of the rotor hub; a pair of spacer portions which are in close contact with the pair of first support portions, respectively; and a pair of fixing pin portions which simultaneously pass through the first support portions and the spacer portions. As a result, it is possible to reduce the possibility that the spacers separate from the steel plate portion.

Description

Rotor core assembly

The present invention relates to a rotor core assembly. More particularly, the present invention relates to a rotor core assembly comprising a first support portion extending from a steel plate portion and having a support hole formed thereon, a spacer portion having a spacer hole formed in close contact with the first support portion, And a second support portion for supporting an end portion of the fixing pin portion and a fixing pin portion passing through the hole and the spacer hole at the same time. This feature makes it possible to reduce the possibility that the spacer is separated from the steel plate portion.

As the population grows and the industry develops, demand for fossil fuels increases, causing problems such as resource depletion and rising international prices. In addition, as fossil fuels are recognized as a cause of global warming, there is an increasing tendency to reduce the use of fossil fuels such as giving disadvantage to countries with high usage.

Thus, in recent years, renewable energy, which uses existing fossil fuels as a recycled or renewable energy, has become an alternative resource. Unlike fossil fuels, renewable energy can not be depleted because it can be regenerated, and there is less environmental pollution or carbon dioxide emissions, which is environmentally friendly.

Types of renewable energy include geothermal energy, algae energy, bio energy, solar energy, and wind energy. In particular, wind energy is generated by turning windmills by the force of wind. Wind power refers to the conversion of wind energy into mechanical energy by means of wind turbines and other devices, and the generation of electricity by using this energy.

The wind turbine generator consists of a rotating blade, a hub, a shaft, a gearbox, and a generator. 1 is a cross-sectional view of a conventional rotor of a generator. Hereinafter, components of a rotor of a conventional generator will be described with reference to FIG.

The rotor (rotor) is connected to the speed-increasing gear and generates an electromotive force by electromagnetic induction action with the stator (stator) surrounding the rotor. The rotor is generally cylindrical in shape with the shaft 1 passing through the center. A rotor hub 2 is coupled along the outer circumferential surface of the shaft 1 and a rotor core 3 is coupled to the outer circumferential surface of the rotor hub 2. A prererring 5, a bolt 6 and a fan 7 are sequentially coupled to the side surface of the rotor core 3.

The rotor core (3) is an electric steel plate to which permanent magnets are coupled. A plurality of rotor cores 3 are formed and coupled to the rotor hub 2. At this time, the rotor core spacers 4 are inserted between the rotor cores 3 to maintain the spacing of the rotor cores 3. [ This gap serves as an air duct, and the rotor core 3 can be cooled.

At this time, conventionally, when the rotor core 3 and the rotor core spacer 4 are combined, they are bonded through an adhesive material or through a simple pin. However, in a case where the adhesion state between the rotor core 3 and the rotor core spacer 4 is poor or the adhesion force is weakened by long-term use, the rotor core spacer 4 may be separated from the rotor core 3. As a result, the rotor core spacer 4 is detached by the centrifugal force and collides with the stator to be damaged. Also, when the rotor core spacer 4 is disengaged at a certain point, the gap between the rotor cores 3 at a certain point is narrowed, and the flow of the cooling air is disturbed, thereby lowering the output of the generator. Therefore, there is a need for an invention for increasing the coupling force between the rotor core 3 and the rotor core spacer 4.

The present invention relates to a rotor core assembly, wherein a rotor core assembly extends from a steel plate portion of a rotor core assembly and has a first support portion formed with a support hole, a spacer hole formed in close contact with the first support portion, A spacer portion, a fixing pin portion passing through the support hole and the spacer hole at the same time, and a second support portion supporting the end portion of the fixing pin portion. With this feature, it is intended to solve the problem that the rotor core spacer is detached in the process of rotating the conventional rotor core.

In order to achieve the above object, a rotor core assembly according to the present invention comprises a steel plate portion extending in the longitudinal direction of the rotor hub, a magnet portion passing through the steel plate portion, a rotor hub at the one end of the steel plate portion, A pair of spacer portions which are respectively in contact with the pair of first support portions and a pair of fixing pins which extend through the first support portion and the spacer portion at the same time, .

In addition, a pair of support holes are formed in the first support portion of the rotor core assembly according to the present invention, and a pair of spacer holes are formed in the spacer portion at positions facing the pair of support holes.

In addition, one end of the first support portion of the rotor core assembly according to the present invention is characterized in that a bent portion for supporting the spacer portion is formed by being bent in the longitudinal direction of the rotor hub.

In addition, at one point of the steel plate portion of the rotor core assembly according to the present invention, the first support portion and the rotor hub may be symmetrical with respect to the longitudinal direction of the rotor hub with respect to the center portion of the rotor hub, And a pair of second supporting portions extending and formed.

A second support portion of the rotor core assembly according to the present invention is formed with a pair of recesses recessed in the longitudinal direction of the rotor hub to receive one end portion of the pair of fixing pin portions.

In addition, a pair of housing portions formed in the second support portion of the rotor core assembly according to the present invention and having a hollow portion extending in the longitudinal direction of the rotor hub through which the pair of fixing pins can pass can be formed.

The rotor core assembly according to the present invention is characterized in that a pair of first support portions and a pair of second support portions formed on one end and one point of the steel plate portion are formed to be symmetrical on the other end portion and the other point of the steel plate portion of the rotor core assembly according to the present invention .

The difference between the distance from the center of the groove of the rotor core assembly to the outer circumferential surface of the housing part and the distance from the center of the groove to the outer circumferential surface of the groove is greater than zero, Is less than the distance from the center to the center.

The rotor core assembly according to the present invention is characterized in that a third support portion capable of penetrating the fixing pin portion is formed between the first support portion and the second support portion.

The spacer portion can be easily coupled to or detached from the steel plate portion due to the configuration of the first support portion, the support hole, the spacer portion, the spacer hole and the fixing pin portion of the rotor core assembly according to the embodiment of the present invention, The spacer portion and the first support portion are simultaneously penetrated, so that the bonding force of the spacer portion is increased and the possibility of disengagement from the steel plate portion is reduced.

Further, due to the configuration of the bent portion according to the embodiment of the present invention, it is possible to correct and prevent the shaking in the vertical direction of the longitudinal direction of the rotor hub of the spacer portion, and the length of the rotor hub It is possible to correct and prevent the shake in the direction. Therefore, it is possible to correct and prevent the shaking of the upper, lower, left, and right portions of the spacer portion, thereby reducing the possibility of disengagement of the spacer portion.

In addition, according to an embodiment of the present invention, the angle formed between the bent portion and the first supporting portion is 90 degrees, and the area of contact between the bent portion and the spacer portion is maximized, thereby reducing the possibility of disengagement of the spacer portion.

Further, since the end portion of the fixing pin portion is engaged with the recess formed in the second support portion according to another embodiment of the present invention, the supporting force for supporting the fixing pin portion by the second support portion is increased.

In the housing part according to another embodiment of the present invention, the distance difference d between the distance from the center of the groove to the outer circumferential surface of the housing part and the distance r from the groove center to the outer circumferential surface of the groove is less than r, And can function as a preventive wall for preventing the fixing pin portion from being disengaged when the fixing pin portion is broken.

Further, due to the third support portion according to another embodiment of the present invention, it is possible to prevent the fixing pin portion from being bent, thereby preventing breakage of the fixing pin portion.

1 is a cross-sectional view of a conventional rotor of a generator.

2 is a perspective view illustrating a rotor core assembly according to an embodiment of the present invention.

3 is an exploded perspective view of a rotor core assembly in accordance with an embodiment of the present invention.

4 is an enlarged view of the portion 'A' in FIG.

FIG. 5 is an enlarged view of a combined state of a spacer portion, a first support portion, a second support portion, and a fixing pin portion of a rotor core assembly according to an embodiment of the present invention.

6 is an enlarged view of a vicinity of a second support portion of a rotor core assembly according to another embodiment of the present invention.

FIG. 7 is an enlarged view of a combined state of a spacer pin, a first support, a second support, and a fixing pin of a third support in a rotor core assembly according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and methods of achieving them will be apparent with reference to the embodiments described in detail below with reference to the drawings. However, the present invention is not limited to the embodiments described below, but may be implemented in various forms. In the following embodiments, the terms first, second, and the like are used for the purpose of distinguishing one element from another element, not the limitative meaning. Also, the singular expressions include plural expressions unless the context clearly dictates otherwise. Also, the terms include, including, etc. mean that there is a feature, or element, recited in the specification and does not preclude the possibility that one or more other features or components may be added. Also, in the drawings, for convenience of explanation, the components may be exaggerated or reduced in size. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted .

FIG. 2 is a perspective view illustrating a rotor core assembly according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of a rotor core assembly according to an embodiment of the present invention. Hereinafter, components and features of a rotor core assembly according to an embodiment of the present invention will be described with reference to FIGS. 2 and 3. FIG.

In the present invention, the longitudinal direction of the rotor hub is an x-axis direction with reference to Figs. 2 and 3, and a y-axis direction perpendicular to the longitudinal direction.

A rotor core assembly according to an embodiment of the present invention includes a steel plate portion 100, a magnet portion 200, a first support portion 300, a second support portion 400, a spacer portion 500, a fixing pin portion 600, And a holding pin portion 700.

A plurality of rotor core assemblies are formed to surround the outer circumferential surface of the rotor hub and are coupled with a predetermined distance along the longitudinal direction of the rotor hub. A spacer portion 500 to be described later is coupled between a plurality of rotor core assemblies coupled in the longitudinal direction of the rotor hub. The rotor hub is a known component, and a description of the features of the rotor hub will be omitted.

The steel plate part 100 is a place where the magnet part 200 is inserted, and is preferably made of steel. The steel plate part 100 is formed to extend in the longitudinal direction of the rotor hub. At this time, it is preferable that the steel plate part 100 is formed by overlapping a plurality of thin steel plates in the longitudinal direction. In Fig. 3, steel plates at both ends of the steel plate 100 are partially exploded for convenience of explanation.

A pair of slit portions 110 are formed through the center of the steel plate portion 100. A pair of magnet parts 200 extending in the longitudinal direction of the rotor hub are inserted into the slit part 110, respectively. The magnet unit 200 is preferably a magnet, and the pair of magnet units 200 is preferably formed of a magnet unit 200 having N-pole and S-pole characteristics.

A pair of first supporting portions 300 are formed at one end of the steel plate 100 so as to extend symmetrically with respect to the center of the steel plate 100 in a direction perpendicular to the longitudinal direction of the rotor hub. 3, assuming that there is an imaginary center line passing through the central portion of the steel plate 100 in the x-axis direction, a pair of first supports (not shown) 300 are protruded and extended. Therefore, the steel sheet at one end of the plurality of steel sheets constituting the steel sheet 100 is shaped so as to protrude in the y-axis direction from the other steel sheets.

Accordingly, the first support part 300 serves to provide a space that can be engaged with the spacer part 500. [ In the conventional case, when the rotor core spacer is to be coupled through the rotor core and the fixing pin, a certain amount of holes for penetrating the fixing pin must be secured in the longitudinal direction of the rotor hub at one point of the rotor core. There is a problem that it occurs.

However, according to the present invention, in order to couple the spacer portion 500 corresponding to the conventional rotor core spacer to the steel plate portion 100 corresponding to the conventional rotor core, the support hole 310 may be formed only at one point of the protruded first support portion 300 rather than the entire steel plate portion 100, so that the loss of the steel plate portion 100 is small.

The spacer 500 is closely attached to the first supporting part 300. The spacer portion 500 corresponds to a conventional rotor core spacer and serves to provide a distance between the plurality of rotor core assemblies coupled to the rotor hub to form an air duct.

At this time, it is preferable that the spacer parts 500 are formed as a pair and are in close contact with the pair of first supporting parts 300, respectively. When the spacer 500 is coupled to only one of the first supporting portions 300 of the pair of first supporting portions 300, an unbalance occurs in the y axis direction when the rotor core assemblies are coupled to each other, There arises a problem that the first support portions 300 of the adjacent rotor core assemblies, to which the portion 500 is not coupled, are adhered to each other. However, when the spacer 500 is formed as a pair according to the present invention, since the rotor 500 is balanced in the y-axis direction, there is an advantage that the distance between the adjacent first rotor 300 and the first rotor 300 can be maintained.

A pair of support holes 310 are formed in the first support part 300. The spacer 500 is formed with a pair of spacer holes 510 at positions facing the pair of support holes 310. At this time, the pair of fixing pin portions 600 pass through the support hole 310 and the spacer hole 510 at the same time. As a result, the first support part 300 and the spacer part 500 can be coupled and fixed.

The following advantages arise from the above structure. Since the fixing pin portion 600 is formed as a pair, there is an advantage that the coupling force between the first supporting portion 300 and the spacer portion 500 is increased. Further, since the pin-hole coupling structure is used, it is easy to replace. Therefore, when the life of the spacer part 500 is short, the spacer part 500 can be removed and the new spacer part 500 can be inserted into the fixing pin part 600 again. Therefore, the replacement time can be shortened and the replacement cost can be reduced There is an advantage to be saved.

The first support part 300 may be formed with a bent part 301 that is bent in the longitudinal direction of the rotor hub. Reference is made to Fig. 4 to describe the shape of the bent portion 301 and the effect thereon. 4 is an enlarged view of the portion 'A' in FIG.

As shown in FIG. 4, the bent portion 301 is formed by bending at both ends of the first support portion 300. At this time, it is preferable that the bent portion 301 and the spacer portion 500 are positioned so that the outer side surface of the spacer portion 500 is in contact with the inner side surface of the bent portion 301.

The fixing pin unit 600 is cylindrical and thus the fixing pin unit 600 may be idle in the support hole 310 and the spacer hole 510 in the course of rotating the rotor core assembly. This prevents the spacer portion 500 from stably contacting the first support portion 300 and allows the spacer portion 500 to be released while the spacer portion 500 is continuously shaken in the direction perpendicular to the longitudinal direction of the rotor hub .

However, according to the present invention, since the bent portion 301 supports the spacer portion 500, it plays a role of correcting and preventing the shaking in the vertical direction of the rotor hub of the spacer portion 500, There is an advantage that the possibility of disengagement of the part 500 is lowered.

At this time, the angle? Between the first support part 300 and the bent part 301 is preferably 90 degrees. When the angle? Is less than 90 degrees, the bent portion 301 is inclined toward the central portion of the steel plate 100, so that the end of the spacer portion 500 of the first supporting portion 300 and the inclined bent portion 301 The space in which the spacer 500 can be engaged is reduced by the distance between the end portions of the rotor 500 and the spacer 500, and the length of the spacer 500 in the direction perpendicular to the longitudinal direction of the rotor hub is reduced. As a result, the rigidity of the spacer portion 500 is reduced, and the risk of breakage increases. In addition, since the area of contact between the inner side surface of the bent portion 301 and the outer side surface of the spacer portion 500 is less than 90 degrees, the bonding force between the entire first support portion 300 and the spacer portion 500 is reduced .

In the case where the angle? Is more than 90 degrees, since the bent portion 301 is formed on both sides with respect to the center of the first supporting portion 300, the spacer portion 500 is pressed and supported at both ends The function of the bent portion 301 can not be performed. Therefore, it is preferable that the angle? Between the first support portion 300 and the bent portion 301 is 90 degrees so that the range of the area in which the inner side surface of the bent portion 301 and the outer side surface of the spacer portion 500 are maximized is preferable Do.

A second support part 400 is formed at one point of the steel plate part 100. The second support part 400 is extended from one steel plate other than the steel plate in which the first support part 300 is formed, like the first support part 300. The second support part 400 is formed at a predetermined distance in the longitudinal direction of the first support part 300 and the rotor hub. It is preferable that the second support portions 400 are formed as a pair such that the second support portions 400 are symmetrical with respect to the longitudinal direction of the rotor hub with respect to the central portion of the steel plate portion 100 as in the first support portion 300.

Reference is made to Fig. 5 to describe the position and function of the second support portion 400. Fig. FIG. 5 is an enlarged view of a combined state of a spacer portion, a first support portion, a second support portion, and a fixing pin portion of a rotor core assembly according to an embodiment of the present invention.

3 and 5, the second support part 400 may have the same shape as that of the first support part 300 except for the bent part 301 and the support hole 310. Unlike the first supporting part 300, the second supporting part 400 does not support the spacer part 500, so that the bending part 301 is unnecessary. This has the advantage that the weight of the entire rotor core assembly can be reduced.

When the fixing pin unit 600 passes through the spacer unit 500 and the support hole 310 of the first support unit 300, the fixing pin unit 600 protrudes toward the second support unit 400 as shown in FIG. The bar and the fixing pin portion 600, which are a combination of the pin-hole structure, inevitably move in the longitudinal direction of the rotor hub. At this time, the end of the fixing pin portion 600 and the second supporting portion 400 are brought into contact with each other due to the second supporting portion 400. Accordingly, the second support part 400 serves to correct and prevent the shaking of the fixing pin part 600 in the longitudinal direction of the rotor hub. The swinging of the fixing pin portion 600 in the downward direction can be held with reference to FIG. This has the advantage of reducing the possibility of disengagement of the spacer portion 500 during the rotational movement of the rotor core assembly.

3, when the first support part 300 and the second support part 400 are formed at one end and one point of the steel plate part 100, 1 support portion 300 and the second support portion 400 are formed to be symmetrical. More specifically, the first support portion 300 and the second support portion 400 are formed as a pair so as to be symmetrical with respect to the center of the steel plate portion 100 in the longitudinal direction of the rotor hub. When the spacer 500 and the fixing pin 600 are coupled to each other, the entire rotor core assembly must be coupled to the rotor core.

3, the spacer 500 and the fixing pin 600 can be selectively coupled to any one of the left and right portions with respect to the center of the steel plate 100, do. This has the advantage that when the rotor core assembly is coupled to the rotor hub, the coupling position of the rotor core assembly is not constrained.

As described above, the rotor core assembly of the present invention has the spacer portion 500 formed by the first support portion 300, the support hole 310, the spacer portion 500, the spacer hole 510 and the fixing pin portion 600, It is possible to easily engage and detach the steel plate part 100, and the bar binding force (or adhesion force) of the pair can be increased.

Further, due to the configuration of the bent portion 301, it is possible to correct and prevent the shaking in the vertical direction of the rotor hub of the spacer portion 500 in the longitudinal direction, 500 in the longitudinal direction of the rotor hub can be corrected and prevented. Therefore, it is possible to correct and prevent the shaking of the upper, lower, left, and right portions of the spacer portion 500, thereby reducing the possibility of disengagement of the spacer portion 500.

The pin fin 700 is assembled with the bolt 720 through the hook 120 formed in the steel plate 100 and the washer 710. The pin fin 700 serves as a support for fixing and supporting the steel plates when assembling a plurality of steel plates.

6 is an enlarged view of the vicinity of the second support portion 400 of the rotor core assembly according to another embodiment of the present invention. Hereinafter, the configuration and effects of a rotor core assembly according to another embodiment of the present invention will be described with reference to FIG.

The rotor core assembly according to another embodiment of the present invention includes all the configurations of the rotor core assembly according to one embodiment and further includes the configuration of the groove 410 and the housing part 420. [

The grooves 410 are formed to be recessed by a predetermined distance in the center direction of the steel plate portion 100 from the second support portion 400. It is preferable that the groove 410 and the fixing pin portion 600 are fitted in a fit so that the fixing pin portion 600 can be inserted and fixed in the groove 410.

Further, it is preferable that the pair of fixing pins 600 are inserted into the fixing hole, and it is preferable that the fixing pins 600 are formed at a position facing the supporting hole 310. Therefore, it is preferable that the center line of the spacer hole 510, the support hole 310, and the groove 410 are all the same.

The second support portion 400 supports not only the fixing pin portion 600 but also the end portion of the fixing pin portion 600 when the fixing pin portion 600 is inserted into the recessed groove 410 The groove 410 can correct and prevent the shaking of the end of the fixing pin unit 600 because the groove 410 is fitted in the groove 410. Accordingly, the second support part 400 according to another embodiment has an advantage that the supporting force of the fixing pin part 600 is increased compared to the first embodiment.

As shown in FIG. 6, it is preferable that a second support part 400 is formed with a housing part 420 formed with a hollow part extending in the longitudinal direction of the rotor hub about the groove 410. The fixing pin portion 600 can penetrate through the hollow portion of the housing portion 420.

The following effects are produced due to the configuration of the housing part 420. Referring to FIG. 6, the housing part 420 surrounds the fixing pin part 600. A case where the fixing pin portion 600 is broken during the rotational motion of the rotor core assembly is periodically generated. At this time, the housing part 420 supports the fixing pin part 600 so that the broken fixing pin part 600 is released and the other parts are not damaged. In other words, it serves as a separation preventing wall of the broken fixing pin portion 600.

At this time, the distance difference d between the distance from the center of the groove 410 to the outer circumferential surface of the housing portion and the distance r from the center of the groove 410 to the outer circumferential surface of the groove 410 is preferably more than 0 and less than r. When the distance difference d is 0, it is preferable that the fixing pin portion 600 is not insertable into the housing portion 420, When the distance difference d is equal to or larger than r, the radius r of the cross section of the stationary pin portion becomes smaller than the distance difference d (r + d is constant) So that the fixing pin portion 600, which is broken to the outside of the housing portion 420, may be separated. As a result, it is impossible to perform the role of the housing part 420. Therefore, it is preferable that the distance difference d is more than 0 and less than r.

FIG. 7 is an enlarged view of a combined state of a spacer pin, a first support, a second support, and a fixing pin of a third support in a rotor core assembly according to another embodiment of the present invention. Hereinafter, the configuration and effects of the rotor core assembly according to another embodiment of the present invention will be described with reference to FIG.

A rotor core assembly according to another embodiment of the present invention includes all the configurations of the rotor core assembly according to one embodiment. At this time, the rotor core assembly according to another embodiment may be included.

The rotor core assembly according to another embodiment further includes a third support portion 800 between the first support portion 300 and the second support portion 400. It is preferable that the third support part 800 has the same shape except the bent part 301 in the shape of the first support part 300. Therefore, a support hole 810 through which the fixing pin portion 600 can pass is formed. The reference numerals 310 and 810 are support holes and have the same shape and position, respectively. Therefore, the center line of the spacer hole 510, the support hole 310 of the first support portion, and the support hole 810 of the third support portion are all the same.

7, the support hole 310 of the first support portion supports the upper portion of the fixing pin portion 600, and the second support portion 400 or the groove 410 of the second support portion of the other embodiment supports the fixing pin portion 600 600). When such a structure is formed, since the upper and lower portions of the fixing pin portion 600 are respectively supported, the center portion of the fixing pin portion 600 may be bent, and if the bending phenomenon is maintained, the fixing pin portion 600 may be broken There is concern. However, according to another embodiment, since the center portion of the fixing pin portion 600 is supported by the third supporting portion 800, there is an advantage that the warping phenomenon can be prevented.

The distance between the first supporting part 300 and the third supporting part 800 is preferably the same as the distance between the third supporting part 800 and the second supporting part 400. When the third support part 800 is tilted to one side of the fixing pin part 600, the supporting force applied to one side and the other side is different. However, when the distances are the same, since the center of gravity is the same and the supporting forces applied to both sides are the same, the effect of preventing the warping phenomenon is maximized.

The present invention relates to a rotor core assembly. More particularly, the present invention relates to a rotor core assembly comprising a first support portion extending from a steel plate portion and having a support hole formed thereon, a spacer portion having a spacer hole formed in close contact with the first support portion, And a second support portion for supporting an end portion of the fixing pin portion and a fixing pin portion passing through the hole and the spacer hole at the same time. This feature makes it possible to reduce the possibility that the spacer is separated from the steel plate portion.

Claims (9)

A rotor core assembly coupled along an outer circumferential surface of a rotor hub, A steel plate portion extending in the longitudinal direction of the rotor hub; A magnet section passing through the steel plate section; A pair of first supporting portions extending from one end of the steel plate to extend in a direction perpendicular to a longitudinal direction of the rotor hub with respect to a virtual center line of the rotor hub; A pair of spacer portions which are respectively in close contact with the pair of first supporting portions; And And a pair of fixing pin portions passing through the first support portion and the spacer portion at the same time Rotor core assembly. The method according to claim 1, A pair of support holes are formed in the first support portion, And the spacer portion is formed with a pair of spacer holes at positions facing the pair of support holes Rotor core assembly. 3. The method of claim 2, One end of the first support portion And a bent portion that is bent in the longitudinal direction of the rotor hub to support the spacer portion is formed Rotor core assembly. The method of claim 3, At one point of the steel plate portion, The first support portion and the rotor hub are spaced apart from each other by a predetermined distance in the longitudinal direction, And a pair of second support portions extending symmetrically with respect to a longitudinal direction of the rotor hub with respect to a central portion of the rotor hub are formed Rotor core assembly. 5. The method of claim 4, In the second support portion, And a pair of recesses recessed in the longitudinal direction of the rotor hub are formed to accommodate one end of the pair of fixing pin portions. Rotor core assembly. 6. The method of claim 5, In the second support portion, And a pair of housing parts extending in the longitudinal direction of the rotor hub through which the pair of fixing pins can pass and formed with hollow parts are formed Rotor core assembly. 5. The method of claim 4, At the other end and other points of the steel plate portion, And the pair of first support portions and the pair of second support portions formed at one end and one point of the steel plate portion are formed to be symmetrical Rotor core assembly. The method according to claim 6, The difference between the distance from the center of the groove to the outer circumferential surface of the housing part and the distance from the center of the groove to the outer circumferential surface of the groove, Is greater than zero and less than a distance from the center of the groove to the outer circumferential surface of the groove Rotor core assembly. 5. The method of claim 4, And a third support portion through which the fixing pin portion can pass is formed between the first support portion and the second support portion Rotor core assembly.

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