KR20170095699A - Rotor for Wound Rotor Synchronous Motor - Google Patents

Abstract

The present invention relates to a rotor of a field winding type motor, and more particularly, to a rotor of a field winding type motor, capable of securing concentricity when the rotor is assembled and previously preventing the breakage and crack of an outer core of the rotor. To this end, the rotor of the field winding type motor according to the present invention includes: an inner core in which a hollow part through which a rotation shaft passes is formed in the center; the outer core on which a plurality of teeth parts around which coils are wound are arranged at equal intervals and a guide groove guided by a guide pin of an assembling jig is formed on one side; and a coupling part which is formed to be mutually engaged with the teeth part formed on the outer core and a circumferential surface of the inner core corresponding to the teeth part, with a female and male type.

Description

[0001] The present invention relates to a rotor for a worm rotor,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a field winding type motor, and more particularly, to a rotor of a field winding type motor capable of securing a concentricity at the time of assembling the rotor and preventing cracking and breakage of the outer core of the rotor will be.

Generally, a hybrid vehicle or an electric vehicle, which is referred to as an environmentally friendly automobile, is driven by an electric motor that obtains rotational power by electric energy.

The hybrid vehicle travels in an EV (Electric Vehicle) mode, which is a pure electric vehicle mode using only the electric power of an electric motor, or in an HEV (Hybrid Electric Vehicle) mode, in which both rotational power of the engine and the drive motor is used as power. And a general electric vehicle drives by using the rotational power of the driving motor as a power source.

Most of the drive motors used as power sources for environmentally friendly vehicles use permanent magnet type synchronous motors (PMSM). Such a permanent magnet type synchronous motor needs to maximize the performance of the permanent magnets in order to exhibit maximum performance under constrained layout conditions.

Here, neodymium (Nd) in the permanent magnet improves the strength of the permanent magnet, and dysprosium (Dy) improves demagnetization resistance. However, rare earth (Nd, Dy) metals of these permanent magnets are buried in a limited number of countries such as China, and are very expensive and prone to price fluctuations.

In order to improve this, the application of the induction motor has been studied recently. However, in order to exhibit the same motor performance, there is an excessive restriction on the volume increase of the volume and weight.

Meanwhile, in the related industry, development of a field winding type (WRSM) drive motor to replace a permanent magnet type synchronous motor (PMSM) as an electric motor used as a power source of an environmentally friendly automobile is progressing more actively.

The field winding type motor can exhibit the performance of the motor with an optimum increase of about 10% compared with the permanent magnet type synchronous motor (PMSM). When the current is applied by winding the coil to the rotor, the permanent magnet type synchronous motor PMSM) permanent magnet.

In such a field winding type motor, a coil is wound to generate a magnetic flux in the rotor, and a brush and a slip ring are provided outside the motor housing to generate a magnetic flux, thereby applying a current through the brush.

FIG. 1 shows a structure of a rotor of a conventional field winding motor.

1, a rotor for a field winding type motor includes a base portion 11 formed with a hollow 13 into which a shaft of a rotor is inserted and a base portion 11 extending outwardly from the periphery of the base portion 11, A plurality of tooth portions 14 formed to be spaced apart from each other by a predetermined distance and a pole piece 12 having a width wider than the tooth portion 14 and provided at an end of the tooth portion 14. Then, the coil 18 to which the current is applied is wound on the plurality of tooth portions 14.

The first space portion 15 is formed between the neighboring pole pieces 12 and the second space portion 16 is formed between the neighboring tooth portions 14 wound with the coil 18 have.

However, since the conventional field winding motor having the above-described structure is not provided with a fixing structure for the axial direction of the rotor, there is a possibility that the coil 18 is scattered during high-speed rotation of the rotor.

That is, when the rotor rotates at a high speed, the coil 18 wound around the tooth portion 14 may be loosened and scattered to the outside through the first space portion 15 formed between the adjacent poles 12. When the coil 18 is scattered, the rotation balance of the rotor is shifted, and the insulation property of the coil 18 is destroyed, so that the motor may not be able to realize its original performance or even become unusable. As a result, the reliability of the rotor coil structure is deteriorated.

In order to wind the coil 18 on the rotor tooth portion 14, the conventional field winding motor requires a nozzle (not shown) of the winding machine to pass through the narrow first space portion 15 between the pole shoes 12 In this case, due to the space limitation of winding the coil, the winding space of the winding nozzle is restricted and the winding operation of the coil is very difficult. Due to the spatial restriction due to the coil winding, the coil dot rate The ratio of the cross-sectional area of the conductor being made to the cross-sectional area of the entire coil) is reduced.

In addition, it is necessary to wind the insulating paper around the outer surface of the tooth portion 14 of the rotor before the winding operation of the coil 18. In such a case, it is not easy to wind the insulating paper due to the narrow spatial limitations described above, There was a problem being raised.

On the other hand, in the conventional field winding type motor, another type of rotor structure is composed of an inner core formed with a plurality of tooth portions around which a coil is wound on the outer peripheral surface, and an outer core coupled to the outside of the inner core, When the inner core and the outer core are assembled together, the rotor is assembled by pushing the tooth portion of the inner core wound with the coil into the inner peripheral surface of the outer core.

However, since the rotor of the conventional field winding type electric motor assembled in the above-described manner is assembled to the inner side of the outer core having the thin thickness by the press-fitting method when the inner core and the outer core are assembled, Cracks may be generated on the thin thickness side of the outer core in the process of press-fitting the inner core into the outer core, and there is a problem that breakage may occur in the outer core in severe cases. Further, since the inner core is normally coupled to the outer core, a high-speed centrifugal force generated when the rotor is driven at a high speed has a problem that a thin portion of the outer core is cracked and broken.

Korean Patent Publication No. 2014-0056848 (Apr.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotor structure of a field winding type motor capable of securing concentricity between an inner core and an outer core at the time of assembling the rotor.

Another problem to be solved by the present invention is to prevent cracks and fractures from occurring in the outer core in the process of pressing the inner core into the thin outer core at the time of assembling the rotor, Which is capable of preventing cracking and breakage of the outer core due to the high-speed centrifugal force.

Another object of the present invention is to provide a rotor structure of a field winding type motor in which a space in which a coil can be scattered during rotation of the rotor is completely cut off and the coil is prevented from being scattered when the rotor is rotated .

Another object of the present invention is to provide a rotor structure of a field winding type motor having a simple structure and an assembling structure compared to a conventional rotor structure of a field winding type motor.

Another object of the present invention is to provide a rotor structure of a field winding type motor which is capable of significantly increasing a dropping rate compared with a conventional rotor coil and thereby reducing the overall size of the motor .

The solution of the present invention is not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a rotor of a field winding type motor including: an inner core having a hollow through which a rotating shaft passes; An outer core in which a plurality of teeth portions on which coils are wound are arranged with an equal interval and a guide groove guided by the guide pins of the assembling jig is formed on one side; And a coupling portion formed on the peripheral surface of the inner core corresponding to the tooth portion formed in the outer core so as to be engaged with each other in male and female form.

Here, the thick core portion having a thick thickness and the thin portion having a thin thickness are alternately arranged along the circumferential direction on the outer core, the tooth portion is formed on the thick portion, and the guide groove is formed on the thin portion Lt; / RTI >

The guide groove may include an inner guide groove formed on an inner surface of the thin portion and an outer guide groove formed on an outer surface of the thin portion.

At this time, the inner guide grooves and the outer guide grooves may be formed on the inner and outer surfaces of the thin portion at positions facing each other.

In addition, the inner guide groove and the outer guide groove may be arranged alternately in zigzag form on inner and outer portions of the thin portion.

The engaging portion may include an engaging projection formed on one of the tooth portion and the inner core of the outer core and an engaging groove formed on the other of the engaging portion and the engaging portion. The engaging projection and the engaging groove may be configured to be engaged with each other have.

Further, a plurality of guide holes, which can be fitted to another guide pin of the assembling jig, may be formed in the hollow of the inner core.

At this time, a counter weight may be press-fitted into some holes of the plurality of holes.

Further, a bobbin having a coil wound thereon may be inserted into the tooth portion.

According to another aspect of the present invention, there is provided a method for assembling a rotor of a field winding type motor, comprising the steps of: (a) engaging a guide groove portion of an outer core with a guide pin portion of a jig for assembling, (B) winding a coil on a tooth portion of the outer core of which lamination is completed; and (c) joining the tooth portion of the outer core and the coupling portion formed on the circumferential surface of the inner core And sequentially laminating the inner cores so as to intermesh with each other.

The step (b) may include the step (b-1) of winding the coil on the bobbin and the step (b-2) of inserting the bobbin with the coil wound on the tooth part of the outer core have.

In the step (c), the inner cores are sequentially stacked such that the engaging portions of the female and male engage with each other while interposing the guide holes of the inner core in another guide pin portion of the assembling jig .

Further, after step (c), a step (d) of press-fitting a counter weight into a part of the plurality of holes formed in the inner core may be additionally performed.

According to the rotor structure for a field winding type motor according to the present invention, the following effects can be obtained.

First, an assembly method in which a plurality of tooth portions in which a coil is wound is formed on the inner side of an outer core, and an inner core is press-fitted into an outer core through an engaging portion formed in male and female form on the inner peripheral surface of the end portion of the tooth portion and the outer peripheral surface of the inner core Therefore, it is possible to prevent cracking and breakage of the outer core caused by the centrifugal force when the rotor core is press-fitted into the thin-walled surface of the outer core of the toothbrush formed in the inner core, The assemblability of the rotor is improved and the time and cost of assembling the rotor can be reduced.

Second, when the rotor is assembled, the guide groove portion formed on the plate-shaped outer core is engaged with the guide pin portion of the assembling jig, and the plate is slid downward to be stacked on the assembling jig sequentially. It is possible to reduce the assembly error in stacking the outer cores.

Particularly, when a plurality of guide pins are formed on the inner and outer surfaces of the outer core to guide the inner and outer guide grooves to the assembling jig, a plurality of guide pins arranged on the inner and outer sides of the outer core It is possible to guide the stacking position of the outer core to the correct position in the inner and outer directions by the guide pin so that the error due to the assembling of the outer core can be reduced to a more precise level thereby contributing to securing the concentricity of the rotor .

In addition, by forming a plurality of holes, which can be fitted to another guide pin of the assembling jig, in the inner portion of the inner core, the inner core can be accurately assembled And can be easily coupled to the outer core through the male and female coupling portions.

Thirdly, when eccentricity is generated in the rotor, the counterweight can be press-fitted into some of the plurality of holes formed in the inner core to suppress eccentricity, thereby improving the rotation balance of the rotor.

Fourthly, unlike the conventional rotor structure, since the space itself in which the coil can be scattered is not formed in the outer core, it is possible to prevent the coil from being scattered to the outside of the rotor when the rotor rotates. Therefore, The reliability of the motor performance can be improved because the problem of the unbalance of the rotation balance of the rotor caused by the scattering of the coil and the deterioration of the performance of the motor due to the insulation breakdown of the coils can be completely overcome.

Fifth, it is possible to assemble the rotor through a simple method of inserting the bobbin having the coil wound therein into the tooth portion of the outer core, and then coupling the inner core to the inner core, thereby facilitating assembly of the rotor and saving time and cost There are advantages to be able to.

Sixth, since the winding operation of the coil is performed by inserting the coil-wound bobbin into the tooth portion of the outer core, it is necessary to wind the coil by inserting the winding nozzle in the space between the narrow poles of the rotor core The workability at the time of winding the coil can be greatly improved, and the cost of the rotor coil can be largely improved and the size of the motor can be reduced.

In addition, since the winding operation of the coil is performed in the external space having no space limitation, it is possible to increase the winding area of the rotor coil, thereby making it possible to improve the driving force of the motor, have.

Seventhly, as the driving force of the rotor can be improved as described above, it is possible to sufficiently obtain the performance of a desired motor without forming the rotor to have a larger size than necessary, so that the motor can be downsized, EV / HEV and ISG (Integrated Starter Generator) motors.

Eighth, since a plurality of guide grooves are arranged alternately in a zigzag shape on the outside of the thin-walled thin-walled portion of the outer core, the magnetic flux leaking through the thin-walled portion can be minimized, There is an effect that the phenomenon can be prevented.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a view showing a rotor structure of a conventional field winding type electric motor.
2 is a perspective view showing a rotor structure of a field winding type electric motor according to an embodiment of the present invention;
Figure 3 is an exploded perspective view of Figure 2;
4 is a detailed view showing the inner core of the rotor in detail;
5 is a detailed view showing the outer core of the rotor in detail;
6 is a comparative view showing a comparison between the pole arc value of the conventional rotor and the pole arc value of the rotor according to the present invention.
FIG. 7 is an assembly view showing a state in which a coil is assembled to a bobbin. FIG.
FIG. 8 is an assembly view sequentially showing a rotor assembly procedure of a field winding type electric motor according to the present invention. FIG.
9 is a view conceptually showing a phenomenon in which a leakage magnetic flux is generated through a thin-wall portion of an outer core when the rotor rotates.
10 is a conceptual view for explaining that leakage magnetic flux is prevented by the guide grooves formed in the outer and inner portions of the outer core.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, a preferred embodiment of a rotor of a field winding type motor according to the present invention will be described in detail with reference to the accompanying drawings.

2 to 5, the rotor 100 of the field winding type electric motor according to the embodiment of the present invention has an inner core 110 and an outer core 120 which are separated from each other.

The inner core 110 and the outer core 120 are formed by laminating a plurality of thin silicon steel sheets. The hollow core 112 is inserted into the center of the inner core 110 through a rotation axis (not shown) of the rotor 100, And a plurality of tooth portions 122 through which the coil 140 is wound are formed on the inner side of the outer core 120.

At this time, the plurality of tooth portions 122 formed on the outer core 120 are formed on the inner surface of the outer core 120 so as to be equally spaced from each other and protrude toward the central portion.

When the outer core 120 is stacked on the assembling jig 200 by stacking the outer core 120 located between the teeth 122 on the outer circumference of the outer core 120, Guide grooves 124a and 124b are formed which are in contact with the outer surfaces of the pins 210 and 220 and guide sliding movement of the outer core 120 downward.

The inner core 110 and the outer core 120 having such a shape are mutually engaged with each other through a male-female coupling portion on the outer peripheral surface of the inner core 110 and the inner peripheral surface of the tooth portion 122 of the outer core 120 .

4 and 5, a plurality of engaging protrusions 113 having a female-like shape and engaging grooves 114 are formed alternately along the circumferential direction on the outer circumferential surface of the inner core 110 And another engaging groove 126 and an engaging protrusion 125 are formed on the inner circumferential surface of the tooth portion 122 of the outer core 120 so as to have a shape corresponding to the engaging protrusion 113 and the engaging recess 114, .

The plurality of coupling protrusions 113 and 125 and the coupling grooves 114 and 126 formed in the inner core 110 and the outer core 120 are engaged with each other by axial indentation.

A plurality of tooth portions 122 through which the coil 140 is wound are formed on the inner surface of the outer core 120 and the inner and outer circumferential surfaces of the inner and outer cores 110, 125 and the engaging grooves 114 and 126 are formed in the inner core 110 and the inner core 110 through the engaging protrusions 113 and 125 and the engaging grooves 114 and 126 when the rotor 100 is assembled, 120 in the axial direction so that the assembling property of the rotor 100 can be improved.

Further, as compared with the conventional rotor assembly method in which the tooth portion formed on the inner core is press-fitted into the thin thickness surface of the outer core, the coupling protrusions 113 and 125 and the coupling grooves 114 and 126 are formed in the inner core 110 having a thick thickness It is possible to prevent the outer core 120 from being cracked when the outer core 120 is press-fitted into the inner core 110 by the outer peripheral surface and the inner peripheral surface of the tooth 122, It is possible to prevent the outer core 120 from being cracked and broken due to the centrifugal force during high-speed rotation of the outer core 120.

The outer core 120 has a structure in which a thick portion 123 having a thick thickness and a thin portion are alternately disposed along the circumferential direction of the outer core 120.

The thick portion 124 is formed to have a thin thickness forming the original thickness of the outer core 120. The thick portion 123 protrudes inwardly in a predetermined width from the inner surface of the outer core 120 Guide grooves 124a and 124b are formed on both sides of the thin portion 124 and a tooth 122 is formed on the thick portion 123. [

The guide grooves 124a and 124b include an inner guide groove 124a formed on the inner surface of the thin portion 124 and an outer guide groove 124b formed on the outer surface of the thin portion 124. [

The inner guide groove 124a and the outer guide groove 124b are formed in a semicircular groove shape having different sizes. The inner guide groove 124a is formed to have a smaller size than the outer guide groove 124b. do.

At this time, the inner guide groove 124a and the outer guide groove 124b may be formed so as to be opposed to each other on the inner and outer portions of the center of the thin portion 124.

As described above, the guide grooves 124a and 124b are formed on both inner and outer sides of the outer core 120, and a plurality of guide pins 124a and 124b, which can guide the inner and outer guide grooves 124b, When the plate-like outer core 120 is stacked on the assembly jig 200 to be assembled, the plurality of guide pins 210 and 220 provided on the assembly jig 200 are formed on the outer surface of the guide pins 210 and 220, Since the outer cores 120 are slid and stacked in order with the guide grooves 124a and 124b of the outer cores 120 engaged with each other, the stacking position of the outer cores 120 is guided to the correct positions in the inner and outer directions, And the concentricity of the rotor 100 can be ensured.

On the other hand, a coil 140 wound in an outer state is inserted and coupled to each tooth portion 122 of the outer core 120.

7, a coil 140 is formed around the tooth 122 by fitting the bobbin 130 wound with the coil 140 to each tooth 122 of the outer core 120 .

At this time, the bobbin 130 is formed to have a rectangular tube shape corresponding to the shape of the tooth 122 of the outer core 120 laminated and assembled.

The bobbin 130 has a structure in which both surfaces facing each other are opened so that the bobbin 130 can be fitted to the outer surface of the tooth 122.

In order to prevent the bobbin 130 having the coil 140 wound thereon from being easily inserted into the tooth 122, a certain level of frictional force is applied between the tooth 122 and the bobbin 130, It is desirable to design.

Since the coil 140 is wired around the bobbin 130 having a rectangular outer shape, the outer shape in which the coil 140 is completely wound around the bobbin 130 also has a rectangular shape.

The coil 140 causes a magnetic flux to be generated around the tooth portion 122 when a current is applied through a brush and a slip ring provided outside the rotor 100.

When the inner core 110 is sequentially stacked on the assembling jig 200 around the hollow 112 of the inner core 110, another guide pin (not shown) A plurality of guide holes 116 that can be fitted into the guide holes 230 are formed.

A plurality of guide holes 116 are formed around the hollow 112 of the inner core 110 so as to be fitted to the other guide pin 230 of the assembly jig 200, The inner core 110 is easily stacked on the outer core 120 through the male and female coupling portions in a state where the inner core 110 is stacked at the precise stacking position through the guiding action of the guide pin 230 and the guide hole 116. [ .

In addition, when eccentricity occurs due to the rotation of the rotor 100, a pin-shaped counterweight (not shown) is formed in a part of the guide holes 116 of the plurality of guide holes 116 formed in the inner core 110. 150 can be press-fitted into the rotor 100, eccentricity of the rotor 100 can be suppressed and the rotation balance of the rotor 100 can be improved.

6 shows a comparison between the pole arc value of the conventional rotor and the pole arc value of the rotor according to the present invention. In the conventional rotor structure shown in FIG. 6 (a), the space portion 15 is interposed Since the neighboring poles 12 are spaced apart from each other, the pole arc value is as small as 35.029 °. 6 (b), since the neighboring pole pieces of the outer core 120 are connected to each other through the thin-walled portions 123, the additional thin- 123, the pole arc value is about 45 °, which is larger than that of the conventional rotor.

This pole arc value is one of the important factors of the motor which contributes to the improvement of the torque of the motor and the reduction of the torque ripple. As the pole arc value increases, the harmonic component of the sinusoidal magnetic flux density is reduced and the torque ripple is reduced In the case of the conventional rotor structure as shown in FIG. 6 (a), since the space portion 15 must be provided in order to secure a space into which the winding machine nozzle for the coil winding can be inserted, The number of windings to be wound on each tooth portion 14 is limited due to the insertion of the nozzle of the winding machine through the narrow space portion 15 to wind the coil so that the dot rate is limited However, in the rotor structure of the present invention, the torque ripple can be greatly reduced due to an increase in the pole arc value due to the addition of the thinned portion 123 of the outer core 120 Since the coil is wound on the portion of the tooth 122 of the outer core 120 in a free state without any spatial restriction before the outer core 120 is coupled to the inner core 110, It can contribute to improvement.

Hereinafter, a method of assembling the field winding motor according to the present invention having the above-described structure will be described with reference to Figs. 7 and 8. Fig.

7 shows a state where the coil 140 is assembled to the bobbin 130. The coil 140 is wound around the bobbin 130 a plurality of times as shown in FIG. 130 are integrated into a coil assembly.

In this case, the coil 140 wound on the bobbin 130 is wound with a sufficient number of windings to exhibit the optimum performance of the motor.

Then, the rotor 100 is assembled according to the assembling procedure shown in FIG.

That is, in the rotor assembly of the field winding motor according to the present invention, first, the inner guide groove 124a and the outer guide groove 124b formed on the inner and outer surfaces of the plate- 200, and then slides downward to stack the outer cores 120 on the assembly jig 200 in order.

When the lamination of the outer core 120 is completed through the above process, the coil 140 is wound on the outer surface of the tooth 122 of the laminated outer core 120.

The coil 140 is wound around the tooth 122 after separating the outer core 120 from the assembly jig 200. The coil 140 is wound on the bobbin 130 are press-fitted into the respective tooth portions 122 of the outer core 120 to be coupled.

After winding the coil 140 on the teeth 122 of the outer core 120 as described above, the outer core 120 is returned to its original state before being separated from the assembly jig 200 The male and female engaging projections 113 and 125 and the engaging grooves 114 and 126 are engaged with the guide hole 116 of the inner core 110 in the portion of the guide pin 230 provided in the assembling jig 200, The inner core 110 is slid downward so as to be sequentially stacked.

The engaging recess 125 formed in the tooth 122 of the outer core 120 and the engaging recess 114 formed in the circumferential surface of the inner core 110 and the engaging protrusion 113 formed in the engaging recess 126 The engagement of the inner core 110 and the outer core 120 is completed.

At this time, if necessary, the counterweight 150 is press-fitted into a portion of the guide hole 116 of the guide hole 116 of the assembled inner core 110 to suppress eccentricity caused by the rotation of the rotor 100 So that the rotation balance of the rotor 100 can be improved.

In this embodiment, the coil 140 is inserted into the teeth 122 of the outer core 120 in a manner that the bobbin 130 having the coil 140 wound thereon is press-fitted into the teeth 122 of the outer core 120, The bobbin 130 in which the coil 140 is not wound is inserted into each tooth 122 first and then the coil 140 is wound around the bobbin 130 and then the inner core 110 is wound around the bobbin 130. [ Or the coil 140 may be wound around each tooth 122 without using the bobbin 130 and then the inner core 110 may be coupled.

9 is a conceptual view illustrating a phenomenon in which a leakage magnetic flux is generated through the thin-walled portion of the outer core when the rotor rotates. The magnetic flux generated from the N pole of the rotor 100 during operation of the motor is transmitted to the rotor 100, And returns to the adjacent S-pole portion through the stator 200 located outside of the stator 200 to form a closed loop like the solid line portion of Fig.

In the rotor structure according to the present invention, since the adjacent pole pieces (thicker portions) form a structure connected to each other through the thinner portion 124, the thinner thinner portions 124 10, both side guide grooves 124a and 124b formed in the inner and outer portions of the thin portion 124 of the outer core 120 may be formed in the same direction as that of the outer core 120. In this case, ) Structure, it is possible to suppress the leakage of magnetic flux through the thin portion 124 and to prevent the torque of the electric motor from being reduced.

In a case where a plurality of inner guide grooves 124a and outer guide grooves 124b are formed in a zigzag form on the inner and outer portions of the thin portion 124, 124 is blocked by a complicated passage structure in the thin portion 123 formed by the plurality of inner and outer guide grooves 124b, smooth movement is restricted, so that torque reduction of the other motors to the leakage magnetic flux is minimized .

At this time, the shape, the number, and the arrangement of the inner and outer guide grooves 124b are not limited to the structure of the above-described embodiment, but can be changed in various shapes, numbers, and arrangements according to the design specifications of the electric motor.

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Accordingly, the embodiments disclosed herein are for the purpose of describing rather than limiting the technical spirit of the present invention, and it is apparent that the scope of the technical idea of the present invention is not limited by these embodiments. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: rotor 110: inner core
112: hollow 113, 125: engaging projection
114, 126: coupling groove 116: guide hole
120: outer core 122:
123: Lambskin 124: Lambskin
124a: Inner guide groove 124b: Outer guide groove
130: Bobbin 140: Coil
150: Counterweight 200: Jig for assembly
210, 220, 230:

Claims (13)

An inner core formed at the center with a hollow through which the rotating shaft passes;
An outer core having a plurality of tooth portions on which coils are wound and arranged at regular intervals and having guide grooves guided by guide pins of the assembling jig on one side;
A coupling portion formed to engage with a tooth portion formed on the outer core and a peripheral surface of the inner core corresponding to the tooth portion in a male and female form;
The rotor of the field winding type electric motor.
[2] The apparatus of claim 1, wherein the outer core is formed with a thick portion having a thick thickness and a thin portion having a thin thickness alternately arranged along the circumferential direction,
The tooth portion is formed in the thick portion,
And the guide groove is formed in the thin-walled portion.
The apparatus according to claim 2,
An inner guide groove formed on an inner surface of the thin portion;
An outer guide groove formed on an outer surface of the thin portion;
And the rotor of the field winding type electric motor.
4. The rotor of the field winding type electric motor according to claim 3, wherein the inner guide groove and the outer guide groove are formed on the inner and outer surfaces of the thin portion at positions facing each other.
4. The rotor of a field winding type electric motor according to claim 3, wherein the inner guide groove and the outer guide groove are alternately arranged in zigzag form on inner and outer portions of the thin portion.
[2] The apparatus of claim 1, wherein the coupling portion comprises a coupling protrusion formed on one of the tooth portion of the outer core and the inner core, and a coupling groove formed on the other of the tooth portion and the inner core,
Wherein the engaging projections and the engaging grooves are engaged with each other by axial indentation.
The rotor of the field winding type motor according to claim 1, wherein a plurality of guide holes are formed in the hollow core of the inner core so as to be fittable with another guide pin of the assembling jig.
8. The rotor of a field winding type electric motor according to claim 7, wherein a counter weight is press-fitted into a part of the plurality of holes.
The rotor of the field winding type electric motor according to claim 1, wherein a bobbin to which the coil is wound is inserted into the tooth portion.
(a) engaging the guide groove portion of the outer core with the guide pin portion of the assembling jig, and sequentially laminating the outer core to the assembling jig;
(b) winding the coil on the tooth portion of the outer core where lamination is completed;
(c) sequentially laminating the inner core so that engaging portions formed on the circumferential surface of the inner core and the tooth portion of the outer core interlock with each other in a male-like manner;
Wherein the rotor assembly includes a rotor and a rotor.
11. The method of claim 10, wherein step (b)
(B-1) winding the coil on the bobbin;
(B-2) inserting the coil-wound bobbin into the tooth portion of the outer core;
Wherein the rotor assembly includes a rotor and a rotor.
The method of claim 10, wherein the step (c)
Wherein the inner core is sequentially laminated such that the engaging portions of the female and male engage with each other while interposing the guide hole of the inner core in another guide pin portion of the assembling jig .
The method as claimed in claim 10, further comprising the step (d) of press-fitting a counter weight into a part of the plurality of holes formed in the inner core after the step (c) .

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