KR20150120789A - Support holder and rotor of wound rotor synchronous motor using the same - Google Patents

Abstract

Disclosed is a support holder of a rotor of a wound rotor synchronous motor. The support holder is installed on the slot of the rotor in the wound rotor synchronous motor, secures insulating performance between coils, and supports the coils. First, second, and third surfaces are formed in an axial direction. A hollow part is formed in an inner part. The first surface faces a pore of a stator. A curved part can be curved toward the pore on the second and third surfaces.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a support structure and a rotor of a field winding linear synchronous motor using the support structure,

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a field winding synchronous motor (WRSM) for an environmentally friendly vehicle, and more particularly, to a support structure for securing insulation between coils and supporting a coil and a rotor of a field- will be.

2. Description of the Related Art Generally, a hybrid vehicle or an electric vehicle called an environment-friendly automobile can generate a driving force by an electric motor (hereinafter referred to as "driving motor"

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

Examples of drive motors used as power sources for environmentally friendly vehicles include permanent magnet synchronous motors (PMSM) and wound rotor synchronous motors (WRSM).

Here, the field winding synchronous motor replaces the permanent magnet of the permanent magnet type synchronous motor (PMSM) by winding the coils not only to the stator but also to the rotor when the current is applied.

The field winding linear synchronous motor has a structure in which a rotor having a coil wound thereon is disposed with a constant gap from the stator and a magnetic flux is generated by applying a current through a brush and a slip ring.

In order to reduce the losses and increase the efficiency of the field synchronous motors, it is necessary to increase the rotor winding dot rate as well as the stator, and it is important to secure the insulation between the phase coils due to the high dot rate in the slots. Further, in the field winding synchronous motor, when the rotor rotates at high speed, the alignment of the coils is lowered due to the centrifugal force acting on the coils, which may cause a failure.

In order to secure the above-mentioned inter-coil insulation and to support the centrifugal force acting on the coil, the field winding type synchronous motor mainly uses a supporting structure (usually referred to as an "insulating structure" .

Meanwhile, in the field winding synchronous motor according to the related art, when the rotor rotates at a high speed, the supporting structure for supporting the rotor coil is installed axially between the coils of the other pole cores, and the weight of the supporting structure itself A support structure having a hollow structure or a hole is used to reduce the size of the support structure.

Generally, the field winding synchronous motors of medium and large size have a very good coil alignment by using a square coil or a rotor coil of the SC winding type, and the number of poles is from 4 to 6 poles. It is easy to install the centrifugal force support or the centrifugal force support structure of the coil.

However, in the field winding synchronous motor used for driving a vehicle, a rotor structure of mainly eight poles or more is applied to increase the output density, so that the space between the coil poles in the slot is not large. In the case of using an annular coil, The coil alignment after winding is deteriorated and it is difficult to install a structure for supporting the coil part. When the molding method is applied, there is a high possibility that the cooling performance of the motor is deteriorated.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

Embodiments of the present invention are directed to a support structure for securing insulation between coils and improving the high-speed rotation stability and cooling performance by applying a structure supporting a centrifugal force acting on the coils with a simple structure, and a field winding To provide a rotor of a synchronous motor.

The support structure according to the embodiment of the present invention is mounted on a slot of a rotor in a field winding synchronous motor to secure a coil insulation performance and to support the coil, A hollow is formed inwardly, a first surface is disposed opposite to the stator in the direction of the gap with the stator, and a curved bent portion is formed on the second and third surfaces in the hollow space.

In addition, in the supporting structure according to the embodiment of the present invention, the curved portion may be formed at a portion connected to the first surface on the second and third surfaces.

In addition, in the support structure according to the embodiment of the present invention, the second and third surfaces may be configured such that the distance between the curved portion and the connecting portion gradually decreases.

The rotor of the field winding synchronous motor according to the embodiment of the present invention includes a rotor core disposed with a constant gap from a stator, and a plurality of teeth are formed on the rotor core, And a supporting structure is inserted into a slot which is a space between the teeth, wherein the supporting structure has first, second and third surfaces in the axial direction and forms a hollow inward, And curved curved portions convexly curved toward the hollow side can be formed on the second and third faces corresponding to the coil pattern of the coil.

Further, in the rotor of the field winding synchronous motor according to the embodiment of the present invention, the support structure may be supported at three points on the rotor core in the slot.

Further, in the rotor of the field winding synchronous motor according to the embodiment of the present invention, the curved portion may be formed at a portion connected to the first surface on the second and third surfaces.

Further, in the rotor of the field winding synchronous motor according to the embodiment of the present invention, the second and third surfaces may be configured such that the interval between the curved portion and the connecting portion gradually decreases.

Further, in the rotor of the field winding synchronous motor according to the embodiment of the present invention, the tooth may be provided with a rotor shoe contacting the stator with a certain gap therebetween.

Further, in the rotor of the field winding synchronous motor according to the embodiment of the present invention, at the ends of the rotor shoe facing each other in the slots, a connecting end of the first and second surfaces, A first coupling groove into which the coupling ends of the first coupling grooves are fitted can be formed.

Further, in the rotor of the field winding synchronous motor according to the embodiment of the present invention, one side of a slot corresponding to a connecting end of the second and third faces is provided with a connecting end of the second and third faces A second coupling groove may be formed.

Embodiments of the present invention provide for securing insulation between coils by slidingly coupling the support structure to the first and second coupling grooves and forming curved portions supporting the coils on the second and third sides of the support structure, At the same time, the centrifugal force acting on the coil at the time of high-speed rotation is firmly supported, the fixing strength of the coil can be improved, and the stability of the rotation of the rotor at high speed can be ensured.

In addition, in the embodiments of the present invention, the fixing structure of the supporting structure is improved to improve the fixing strength of the coil, so that the molding material is not required to be applied to the winding portion of the coil. have.

Furthermore, in the embodiment of the present invention, since the steel material can be bent or the support structure can be manufactured as a resin molding, the cost can be reduced.

In addition, in the embodiment of the present invention, since the hollow volume of the support structure can be reduced through the curved portion, even if the molding material is applied to the winding portion of the coil, the influence on the cooling performance of the coil can be minimized, It is possible to reduce the use of the molding material.

These drawings are for the purpose of describing an exemplary embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is a partial view of a rotor of a field winding synchronous motor according to an embodiment of the present invention.
2 is a perspective view illustrating a supporting structure applied to a rotor of a field winding synchronous motor according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a support structure applied to a rotor of a field winding synchronous motor according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

In the following detailed description, the names of components are categorized into the first, second, and so on in order to distinguish them from each other in the same relationship, and are not necessarily limited to the order in the following description.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

It should be noted that terms such as " ... unit ", "unit of means "," part of item ", "absence of member ", and the like denote a unit of a comprehensive constitution having at least one function or operation it means.

1 is a partial view of a rotor of a field winding synchronous motor according to an embodiment of the present invention.

Referring to FIG. 1, a field winding linear synchronous motor applied to an embodiment of the present invention can be applied to a drive motor for a hybrid vehicle that obtains a driving force from an eco-friendly automobile with electric energy.

For example, the field winding synchronous motor is basically composed of a stator (not shown in the figure) in which a stator coil is wound, and an embodiment of the present invention in which the rotor coil 13 is wound and disposed inside the stator And a rotor 100 according to the present invention.

Here, the inner circumferential surface of the rotor 100 according to the embodiment of the present invention is in contact with a rotating shaft (not shown in the figure), and the outer circumferential surface of the rotor 100 is spaced apart from the inner circumferential surface of the stator, .

Therefore, the field winding synchronous motor not only energizes the stator but also rotates the coils on the rotor 100 to electromagnetize the rotor 100 when a current is applied, and the electromagnets between the electromagnets of the rotor 100 and the electromagnets of the stator The driving torque can be generated by the attractive force and the repulsive force.

Further, the field winding linear synchronous motor applied to the embodiment of the present invention is used for driving a vehicle, and a rotor structure of eight poles or more is applied to increase the output density.

The rotor 100 of the field winding synchronous motor according to the embodiment of the present invention employs a structure that secures insulation between coils and supports a centrifugal force acting on the coils with a simple structure, And the like.

To this end, the rotor 100 of the field winding synchronous motor according to the embodiment of the present invention has a plurality of teeth 11 formed therein and a rotor coil 13 Quot;) comprises a wound rotor core 10 and a support structure 50 which is inserted into the slot 15 between the teeth 11.

The teeth 11 of the rotor core 10 are formed with a slot 15 interposed therebetween. The inner circumferential surface of the rotor core 10 is in contact with the rotating shaft. The outer circumferential surface of the rotor core 10 has a stator (Not shown).

The tooth 11 formed on the rotor core 10 is integrally connected to the coil winding portion 12a through which the coil 13 is wound and the coil winding portion 12a, And includes a contact shoe 12b.

In the embodiment of the present invention, the support structure 50 secures insulation between the coils 13 wound on the coil winding portion 12a of the tooth 11 and supports the centrifugal force acting on the coil 13 .

FIG. 2 is a perspective view illustrating a support structure applied to a rotor of a field winding synchronous motor according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of a field winding synchronous motor according to an embodiment of the present invention, Fig. 5 is a cross-sectional view showing a support structure.

Referring to Figures 2 and 3, in an embodiment of the present invention, the support structure 50 is constructed as a structure in which a coil 13 is inserted into a slot 15 between the wound teeth 11.

The supporting structure 50 includes first, second and third surfaces 51, 52 and 53 in the axial direction of the rotor core 10 and forms a hollow 54 inwardly. And the second and third surfaces 52 and 53 are formed with curved curved portions 61 convexly curved toward the hollow 54 side.

The support structure 50 may be formed by bending a non-magnetic steel material, or may be formed as a resin injection molding.

When applying a non-magnetic steel material, the first, second, and third surfaces 51, 52, and 53 may be formed by bending and shaping the pipe shape, and the plate materials may be bent to weld . ≪ / RTI > In this case, an insulating material for insulation is applied to the outside of the second and third surfaces 52 and 53.

 The curved portion 61 is convex on the second and third faces 52 and 53 toward the hollow 54 corresponding to the winding pattern of the coil 13, And may be formed at a portion connected to the first surface 51 at three sides (52, 53).

In addition, the second and third surfaces 52 and 53 may be configured to gradually narrow the distance between the curved portion 61 and the connecting portion.

Meanwhile, the support structure 50 according to the embodiment of the present invention may be supported at three points in the slot 15 between the teeth 11 with respect to the rotor core 10. [

To this end, the support structure 50 is slidably coupled to the slots 15, and at the ends of the rotor shoe 12b facing each other in the slots 15, A first coupling groove 71 is formed in the axial direction of the rotor core 10 in which the connecting end and the connecting surfaces of the first and third surfaces 51 and 53 are fitted.

The first and second surfaces 52 and 53 are formed on one surface of the slot 15 corresponding to the connection end of the second and third surfaces 52 and 53 Is formed along the axial direction of the rotor core (10).

Therefore, in the rotor 100 of the field winding synchronous motor according to the embodiment of the present invention constructed as described above, in a state in which the coil 13 is wound on the teeth 11 of the rotor core 10, The support structure 50 is inserted into the slot 15 between the teeth 11.

Here, the first surface 51 of the support structure 50 is located opposite to the stator in the direction of the gap with respect to the stator, and the second and third surfaces 52, Which is opposite to the winding pattern.

That is, the first surface 51 is located between the ends of the rotor shoe 12b facing each other in the slot 15, and the curved portions 61 of the second and third surfaces 52, 15, the winding pattern of the convexly curved coil 13 is surrounded.

At this time, the support structure 50 has a first coupling groove 71 formed at the end of the rotor shoe 12b facing each other in the slot 15 and a second coupling groove 71 formed at the connection end of the second and third surfaces 52 and 53 And can be coupled to the first and second coupling grooves 71 and 72 while being slid along the second coupling groove 72 formed on one side of the corresponding slot 15.

According to the rotor 100 of the field winding synchronous motor according to the embodiment of the present invention as described so far, the supporting structure 50 is slidably engaged with the first and second coupling grooves 71 and 72 And the curved portions 61 for supporting the coils 13 are formed on the second and third surfaces 52 and 53 of the support structure 50 to secure the insulation between the coils 13, It is possible to firmly support the centrifugal force acting on the rotor 13, improve the fixing strength of the coil 13, and ensure high-speed rotation stability.

Further, in the embodiment of the present invention, since the fixing structure of the support structure 50 is improved to improve the fixing strength of the coil 13, it is not necessary to apply the molding material to the winding portion of the coil 13, The cooling performance of the coil 13 can be further improved.

Furthermore, in the embodiment of the present invention, since the support structure 50 can be manufactured by bending the steel material or molding the resin, the cost can be reduced.

Meanwhile, in the embodiment of the present invention, in order to further improve the fixing strength of the coil 13, impregnation may be applied to the winding portion of the coil 13, or a molding material may be applied.

Here, in the embodiment of the present invention, since the hollow volume of the support structure 50 can be reduced through the curved portion 61, even if the molding material is applied to the winding portion of the coil 13 as described above, Can be minimized and the use of expensive molding material as much as the reduced volume of hollow can be saved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Other embodiments may easily be suggested by adding, changing, deleting, adding, or the like of elements, but this also falls within the scope of the present invention.

10 ... rotor core
11 ... Chi
12a ... coil winding section
12b ... rotor shoe
13 ... coil
15 ... slot
50 ... support structure
51, 52, 53 ... 1st, 2nd and 3rd sides
54 ... hollow
61 ... biceps
71 ... first coupling groove
72 ... second coupling groove

Claims (7)

A support structure for mounting a coil in a slot of a rotor in a field winding synchronous motor and securing insulation between coils and supporting the coil,
First, second, and third surfaces in the axial direction, and the first surface is disposed opposite to the stator in the direction of the gap with respect to the stator, and the second and third surfaces are curved convexly in the hollow Wherein the support structure comprises at least one support structure. The method according to claim 1,
Wherein the curved portion is formed at a portion connected to the first surface at the second and third surfaces. 3. The method of claim 2,
And the second and third surfaces are configured to be gradually narrowed from the curved portion to the connection portion thereof. A rotor of a field winding synchronous motor having a rotor core disposed with a stator and a constant gap,
A plurality of teeth are formed on the rotor core, each of the coils is wound on the teeth, and a supporting structure is inserted into a slot which is a space between the teeth,
Wherein the support structure includes first, second, and third surfaces in the axial direction and forms a hollow inwardly, the first surface oppositely disposed in the air gap direction, and the second and third And a curved portion curving convexly in the hollow side is formed on the surface of the rotor. 5. The method of claim 4,
Wherein the support structure is supported at three points on the rotor core in the slot. 5. The method of claim 4,
Wherein the curved portion is formed at a portion connected to the first surface on the second and third surfaces,
And the second and third surfaces are configured such that the distance between the curved portion and the connecting portion gradually decreases. 5. The method of claim 4,
Wherein the teeth are provided with a rotor shoe contacting the stator with a predetermined gap therebetween,
Wherein a first coupling groove is formed at an end of the rotor shoe facing each other in the slots so that a coupling end of the first and second surfaces and a coupling end of the first and third surfaces are fitted,
And a second coupling groove is formed on one surface of the slot corresponding to the connection end of the second and third surfaces so that a connection end of the second and third surfaces is inserted.

Images