KR20170120868A - Cooling structure for motor - Google Patents

Abstract

A stator receiving electricity and having a cylindrical shape inside; A rotor accommodated in the stator and one or more windings around which the coils are wound are extended toward the inner circumferential surface of the stator and rotate in response to the applied electricity; A rotating shaft coupled to the rotor in the axial direction of rotation; And a rotating plate rotatable with the rotating shaft in a rotating direction in association with the rotating shaft, wherein the rotating plate includes a plurality of radially arranged rotatable plates from the center of the rotating plate for forced convection during rotation of the air heated by the heat of the coils And the blade is provided with a motor cooling structure in which the blade is extended in a predetermined length while being reduced in radial curvature.

Description

{COOLING STRUCTURE FOR MOTOR}

The present invention relates to a motor cooling structure.

Generally, an electric motor emits a part of electric energy as a heat loss in operation. Such a heat loss causes deterioration of the mechanical characteristics of the motor and shortens the service life. In designing the motor, it is important to reduce heat loss and efficiently cool the generated heat. As a method of cooling an electric motor, a fluid cooling method has been proposed. For example, a plurality of cooling passages are formed in the stator of the electric motor along the axial direction, and a part of the electric motor is provided with an axial hole communicating with the respective cooling passages and a perpendicular hole communicating the respective axial holes with each other And the cooling passages are connected in series to each other so that the cooling fluid is circulated through the cooling passages connected in series to cool the electric motor. However, such a fluid cooling method has an advantage that the generated heat can be efficiently cooled. However, by forming an axial hole or a right angle hole in the structure for supporting the rotor, the strength of the structure can be lowered, And the resistance characteristic is lowered. In another example, a plurality of cooling flow passages are formed in the stator of the electric motor along the axial direction, and holes are formed on both sides of the stator so as to communicate with the cooling passages in a direction perpendicular to the cooling passages. And the cooling channel is connected in series by vertically providing a channel guide plate having a communication channel. However, such a fluid cooling method is required to secure a space for installing the flow guide plate vertically, and thus it is difficult to apply to an electric motor in which the installation space is limited.

Korean Patent Publication No. 2003-0056638 (2003. 07.04)

In an embodiment of the present invention, heat generated inside the electric motor is generated by forming a blade on a rotary plate connected to a rotary shaft of the motor to induce forced convection and heat exchange between the inside and the outside of the electric motor due to forced convection And cooling it.

Another object of the present invention is to provide an air cooling type cooling structure for securing a flow path of air to the inside and outside of a motor and controlling the flow of moisture.

Further, an embodiment of the present invention provides a cooling structure including a rotation plate capable of cooling a motor by using rotation of a motor, wherein the degree of cooling is determined corresponding to the heat that is increased and decreased in proportion to the rotation number of the rotation shaft .

Further, an embodiment of the present invention provides a blade in which the shape of the blade formed on the rotary plate is formed at a predetermined angle to guide the heated air inside the motor to the discharge port side to be discharged to the outside for heat exchange .

According to an embodiment of the present invention, a membrane is disposed at a suction port and a discharge port that allow air to flow in and out between the inside and the outside of the motor, so that the flow of air is maintained and the flow of moisture is blocked.

According to an embodiment of the present invention, there is provided a stator comprising: a stator receiving electricity; A rotor accommodated in the stator and one or more windings around which the coils are wound are extended toward the inner circumferential surface of the stator and rotate in response to the applied electricity; A rotating shaft coupled to the rotor in the axial direction of rotation; And a rotating plate rotatable with the rotating shaft in a rotating direction in association with the rotating shaft, wherein the rotating plate includes a plurality of radially arranged rotatable plates from the center of the rotating plate for forced convection during rotation of the air heated by the heat of the coils And the blade is provided with a motor cooling structure in which the blade is extended in a predetermined length while being reduced in radial curvature.

The surface of the blade facing the rotation direction with respect to the rotation plate may be formed at an acute angle with respect to the rotation direction R on at least one surface.

Further, the blades are extended radially, and the area in contact with the air can be increased as it extends radially.

Further, the rotating plate may further include a through hole.

Further, the through hole may be formed obliquely with respect to the rotation direction R. [

In addition, the motor cooling structure may include one or more membranes through which air can pass and moisture that can not pass through.

The membrane is formed on the front side and the rear side of the rotating plate on the basis of the flow of air, and the membrane located on the front side is formed so that air can be introduced from the outside of the motor, and the membrane located on the rear side is discharged As shown in FIG.

In an embodiment of the present invention, heat generated inside the electric motor is generated by forming a blade on a rotary plate connected to a rotary shaft of the motor to induce forced convection and heat exchange between the inside and the outside of the electric motor due to forced convection Can be cooled.

In addition, an embodiment of the present invention can provide an air cooling type cooling structure that secures air flow paths inside and outside the motor and controls the entry and exit of moisture.

Also, an embodiment of the present invention provides a cooling structure including a rotation plate capable of cooling a motor by using a rotation of a motor, wherein the degree of cooling is determined in accordance with the heat that is increased and decreased in proportion to the rotation number of the rotation shaft .

Further, an embodiment of the present invention provides a blade in which the shape of the blade formed on the rotary plate is formed at a predetermined angle to guide the heated air inside the motor to the discharge port side to be discharged to the outside for heat exchange .

 In an embodiment of the present invention, a membrane is disposed at a suction port and a discharge port, through which air can flow in and out between the inside and the outside of the motor, so that the flow of air can be maintained and the flow of moisture can be blocked.

1 is an exploded perspective view of a motor cooling structure according to an embodiment of the present invention;
2 is a cross-sectional view of a motor illustrating a path through which heated air is moved in a motor cooling structure according to an embodiment of the present invention;
FIG. 3 (a) is a view showing a curvature of a blade according to an embodiment of the present invention, FIG. 3 (b) is a view showing curvature of a blade according to another embodiment of the present invention
FIG. 4A is a view showing an air collecting part formed by a blade according to an embodiment of the present invention, and FIG. 4B is a view showing an air collecting part formed by a blade according to another embodiment.
FIG. 5A is a front view of a blade according to an embodiment of the present invention, FIG. 5B is a front view of a blade according to another embodiment; FIG.
6 is a view showing a through hole formed in a rotary plate according to an embodiment of the present invention;

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, this is merely an example and the present invention is not limited thereto.

In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

The technical idea of the present invention is determined by the claims, and the following embodiments are merely a means for effectively explaining the technical idea of the present invention to a person having ordinary skill in the art to which the present invention belongs.

In the motor of the embodiment of the present invention, the forming direction of the blades may be different according to the rotating direction R, so that the forming direction of the blades is determined by indicating the rotating direction R in the figure as necessary, In the case of a motor capable of being rotated in the forward direction and the reverse direction, the shape of the surface facing the illustrated rotation direction R may be such that the air can be discharged at the time of forward rotation and reverse rotation Or may be formed on both sides.

In the following, the shape of the blade of the rotating plate to be described below is variously exemplified. The shapes of the various blades exemplified are collectively referred to as the blades 410 and each of the blades 410a, 410b, 410c, 410d, 410e, 410f ). In the following description, a plurality of rotation plates 400a and 400b are collectively referred to as a rotation plate 400. [

1 is an exploded perspective view of a motor cooling structure according to an embodiment of the present invention.

Referring to FIG. 1, the motor cooling structure includes a stator 100, a rotor 200, a rotating shaft 300, and a rotating plate 400. The rotating shaft 300 coupled to the rotating plate 400 may be positioned on the center axis of the rotor 200 and fixed to the rotor 200 and the rotor 200 may be positioned inside the stator 100 .

This motor cooling structure can be received within the casing 500 (510, 520), which is illustrated in FIG. According to the motor cooling structure of the present invention, in the motor cooling structure of the present invention, when the rotary plate 400 coupled to the rotary shaft 300 is rotated by the rotation of the rotary shaft 300, The air heated by the electrons 200 can be discharged to the outside of the motor cooling structure. The discharge is discharged by a blade (410 in FIG. 2) formed on the rotary plate 400, and will be described later in detail with reference to FIGS. 2 to 6.

When the casing 500 is included, a discharge port through which the air is discharged may be provided in the casing 500, and a suction port sucked by the discharge of air by a person skilled in the art may be formed. In this case, the suction port and the discharge port may be positioned on the front side and the rear side of the rotary plate 400, respectively, based on the direction in which the air is sucked and discharged. For example, the suction port may be formed on the first casing 510 side and the discharge port may be formed on the second casing 520 side.

Furthermore, the suction port and the discharge port may be the suction or discharge of air through the membrane. This structure is for preventing moisture from flowing from the outside of the motor cooling structure into the inside of the motor cooling structure and allowing only the air flow. The rotating plate 400 generates forced convection by the rotation of the rotating plate 400, The flow of air generated by the motor cooling structure can control the flow of water into and out of the motor cooling structure. In addition, the cooling process through the convection of air can be performed in parallel with the water-cooled motor to cool the motor.

2 is a cross-sectional view of a motor illustrating a path through which heated air is moved in a motor cooling structure according to an embodiment of the present invention.

FIG. 2 is a view showing a case where air is flowed from the outside of the motor to the inside of the motor, or the membrane is located at the entrance for flowing air from the inside to the outside of the motor, in order to explain a path in which the air outside the motor is discharged to the outside of the motor via the inside of the motor. Will be described as an example.

Referring to FIG. 2, the rotor 200 is positioned inside the stator 100, and the rotating shaft 300 is coupled to the center of the rotor 200. The rotating shaft 300 may be supported in a shaft hole formed in the covers 110 and 120 coupled with both ends of the stator 100. The first cover 110 of the covers 110 and 120 coupled to the both ends is formed to be adjacent to the membrane that can be positioned in the first casing 510, .

2, which is a cover disposed adjacent to the rotary plate 400, the through hole 121 may be formed in the second cover 120 so as to discharge the air heated inside the stator 100 have. The air passing through the through hole 121 can be discharged to the outside through the membrane located in the second casing 520 via the through hole 420 formed in the rotating plate 400.

The motor according to the above description may have two or more flow paths of air discharged from the inside to the outside. 2, for example, the first flow path 230 is configured such that air heated in a space formed between the stator 100 and the rotor 200 flows through two through holes 121 , 420) sequentially to the outside of the motor.

The second passage 240 is heated by the air positioned in the space between the rotor 200 and the rotary shaft 300 and is discharged to the outside of the motor through the two through holes 121 and 420 It can be euro.

In addition to the above two cases, it is needless to say that various channels can be formed by determining the position of a suction port through which air is sucked by a person skilled in the art according to the inner structure of the motor and a discharge port through which air is discharged.

As shown in the drawing, the flow paths 230 and 240 are formed in the same manner as the flow path from the membrane serving as the suction port located in the first casing 510 to the membrane serving as the discharge port located in the second casing 520, And the air-cooling path can be variously formed according to the position of the discharge port.

That is, in this case, the air can be moved from the outside to the inside of the motor cooling structure, and the air can be moved to the outside again so that the cooling structure can be an open cooling structure instead of a closed cooling structure in which air is circulated inside the motor structure. Therefore, in the case of not including the member functioning as the inlet and the outlet, the closed cooling structure can be used.

In order to discharge air along the flow paths 230 and 240, the rotary plate 400 may be provided with a blade 410 that forms an air flow toward the discharge port side. The structure of such a blade 410 will be described in detail with reference to FIG. 3 and the following.

FIG. 3 (a) is a plan view showing curvature of the blade 410 according to an embodiment of the present invention, and FIG. 3 (b) is a plan view showing curvature of the blade 410 according to another embodiment of the present invention.

Referring to FIG. 3, a rotary plate 400 connected to the rotary shaft 300 and rotated at the same rotational speed when the rotary shaft 300 rotates is formed to protrude from the rotary plate 400 toward the discharge port, For example, the blades 410a and 410b. The blades 410a and 410b may be formed with a predetermined curvature to cause forced convection.

Here, the predetermined curvature means a curvature in which the forming angle gradually decreases with respect to the radial direction when the radial direction is extended from the center of the rotary plate 400. That is, the predetermined curvature means a gradually decreasing curvature, which may include decreasing continuously until the curvature converges to zero and the curvature becomes negative. The convergence of the curvature to 0 means that the curved surface becomes a plane, and the negative number means that the curved direction of the curved surface changes.

For example, the blade 410a is formed to extend in the radial direction from the center of the rotary plate 400 and has a curvature angle of a portion adjacent to the center of the rotary plate 400 with respect to the radial direction, as shown in (a) and the curvature angle alpha 'formed on the blade end side in the radial direction can be made smaller.

On the other hand, as another example, as the blade 410b is extended in the radial direction as shown in (b), the curvature angles beta and beta 'formed in the radial direction can be increased. In this case, since the curved surface is formed in the opposite direction, it means that the curvature gradually decreases corresponding to the increase in the negative direction after the curvature converges to zero according to the above-mentioned reduction.

In addition, (a) and (b) may be formed so that the area of the surface facing in the radial direction is different. (a), it may be a structure of a blade 410a which is advantageous for moving air to a surface facing the rotation plate 400. In the case of (b), air may be radially moved from the center of the rotation plate 400 The structure of the blade 410b may be the same. In such a structure, a discharge port through which air is discharged in the direction in which air is radiated is advantageous to a structure in which the heated air can be immediately discharged to the outside of the motor. The internal air pressure of the motor drops due to the discharge of the air, so that the air outside the motor that can cool the motor through the intake port of the air can be sucked into the suction port.

4A is a side sectional view showing an air collecting part 440 formed by the blade 410c according to the embodiment of the present invention, Sectional view showing the collecting part 440 '.

The blades 410c and 410d may be formed at at least one side with respect to the rotating plate 400 at an acute angle?. The acute angle θ is formed at an acute angle θ with respect to the rotation direction R with respect to the rotation plates 400 and 400a and is formed at a position adjacent to the through hole 420 formed in the rotation plates 400 and 400a .

Referring to FIGS. 4A and 4B, the blades 410c and 410d may be formed at acute angles? And? 'With respect to the rotation direction R of the rotary plate 400. The acute angles? And? 'Are obtained by forming air collecting parts 440 and 440' for collecting air in front of the blades 410a and 410b with respect to the rotation direction R, And 400b, the value can be determined in consideration of the number of revolutions per minute of the rotating plates 400a and 400b, the amount of air inflow, and the like.

4A and 4B are cross-sectional views of the blades 410c and 410d formed on the rotation plates 400a and 400b and can be variously modified in a section in which they are extended, (a) and (b) may be only two of the various examples to illustrate that air trapping portions 440 and 440 'may be formed.

Particularly, in (a), the front surface of the blade 410c is formed at an acute angle? From the rotation plate 400 with respect to the rotation direction R of the rotation plate 400a, A portion 440 may be formed between the rotating plate 400a and the blade 410c.

On the other hand, in the case of (b), a portion of the blade 410d located at the upper end of the blade 410d is bent at one point and bent at a point, is moved from the rotation plate 400 to an acute angle and a part of the blade 410d positioned at the lower end may be formed at an obtuse angle with respect to the rotation direction R from the rotation plate 400b. Therefore, in the case of (b), the air collecting part 440 'may be formed at the upper end as compared with (a).

FIG. 5A is a front view of the blade 410e according to an embodiment of the present invention, and FIG. 5B is a front view of the blade 410f according to another embodiment.

Referring to FIG. 5, the blades 410e and 410f may have a larger cross-sectional area in contact with air with respect to the rotational direction R as the rotational plate 400 moves in the radial direction. The speed of passage of the blades 410e and 410f may be faster as the radially arranged blades 410e and 410f are further extended in the radial direction on the rotating plate 400 rotated by the same number of revolutions. Accordingly, a greater amount of air can be discharged to the outside by the blades 410e and 410f formed in a larger area from the rotation center toward the outside.

In this case, as shown in (a), the area where the blade 410e is in contact with air is formed in a curved shape and can be formed wide, and the area in which the blade 410f is in contact with air is formed as a straight line, .

Further, in the case of the shape of the blades 410e and 410f in which the area of the front surface with respect to the rotational direction R of the blades 410e and 410f is widened as the area of the front surface of the blades 410e and 410f extends in the radial direction of the rotating plate 400, May be formed adjacent to the radial direction or may be formed when air is discharged to the discharge port via the radial direction.

6 is a view illustrating a through hole 420 formed in the rotation plate 400 according to an embodiment of the present invention.

Referring to FIG. 6, a through hole 420 may be formed in the rotation plate 400, and the through hole 420 may be formed at a predetermined angle. Here, the predetermined angle is formed at an obtuse angle with respect to the rotation direction R of the rotation plate 400, and the inclined plane formed by the obtuse angle may be formed so as to face the rear side on the basis of the movement path of the air.

Such a structure may be a structure for guiding the air to discharge the heated air to the outside of the stator 100 for the same amount of time for the same amount of time, and the structure of the blade 410 described with reference to FIGS. 2 to 5 The role can be assisted.

The air guide angle 421 of the through hole 420 is determined in consideration of the rotational direction R of the rotary plate 400 and the number of revolutions and the like when the predetermined angle and the obtuse angle are referred to as an air guide angle 421. [ . The air guide angle 421 may be formed by the rotation plate 400 having a predetermined thickness or more because the amount of air to be moved by the air guide angle 421 may increase as the rotation plate 400 is thicker . However, the predetermined thickness may be determined in consideration of the internal structure and the volume of the motor.

The plurality of shapes of the blades 410 illustrated in Figs. 3 to 5 may be applied to one blade 410. Fig. For example, as the blade 410 is extended in the radial direction of the rotary plate 400 as shown in FIG. 3 (b), the curvature decreases and an acute angle is formed in the blade 410d as shown in FIG. 4 (b) An air collecting portion 440 'may be formed at the front and a blade 410e having a large air contact area may be formed at the same time as the blade 410 is adjacent to the radial direction as shown in FIG. 5A.

Accordingly, the shapes of the blades 410 can be variously modified and changed by those skilled in the art through the examples shown in Figs. 2 to 6.

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, but, on the contrary, . Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

100: stator
110: first cover
120: second cover
121: Through hole
122:
200: Rotor
210: Coil
220:
230: First Euro
240: the second euro
300:
400, 400a, 400b: rotating plate
410, 410a, 410b, 410c, 410d, 410e, 410f:
420: through hole
421: Air guide angle
430: coupling ball
440, 440 ': Air collecting part
alpha, alpha ', beta, beta': blade
θ: acute angle
500: casing
510: first casing
520: second casing
R: Direction of rotation

Claims (6)

A stator receiving electricity and having a cylindrical shape inside;
A rotor accommodated in the stator and one or more windings around which a coil is wound is extended toward the inner circumferential surface of the stator and rotates in response to the applied electricity;
A rotating shaft coupled with the rotor in the axial direction of rotation; And
And a rotation plate coupled with the rotation axis and rotated together with the rotation axis in the rotation direction,
Wherein the rotary plate comprises a plurality of blades radially arranged from the center of the rotary plate for forced convection during the rotation of the air heated by the heat of the coil,
Wherein the blade is elongated by a predetermined length while being reduced radially in curvature.
The method according to claim 1,
Wherein the blade is formed at an acute angle with respect to the rotation plate in at least one surface with respect to the rotation direction R, the surface facing the rotation direction.
The method according to claim 1,
Wherein the blade extends radially and increases in area in contact with the air as it extends radially.
The method according to claim 1,
Wherein the rotating plate further comprises a through hole,
Wherein the through hole is formed at an obtuse angle with respect to the rotation direction (R).
The method according to claim 1,
Wherein the motor cooling structure includes at least one membrane capable of allowing the air to flow in and out, and blocking moisture in and out.
The method of claim 5,
Wherein the membrane is formed on the front and rear sides of the rotating plate based on the flow of the air,
Wherein the membrane located at the front side is formed to allow the air to flow from the outside of the motor and the membrane located at the rear side is formed so that the air can be discharged from the inside of the motor.

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