Cooling Fan Motor Including Heat Dissipation Structure

Abstract

The present invention relates to a cooling fan motor comprising a heat dissipation structure, wherein the cooling fan motor comprises a stator (100) having a coil (C) wound thereon, a rotor (300) rotatably installed in the center of the interior of the stator, and a housing (500) in which the stator and rotor are housed, wherein the housing comprises: a ring-shaped main cover (510) provided to surround the outer circumference of the stator (100) and having a cooling channel (515) formed therein through which cooling water flows; and a first side cover (530) coupled to one side of the main cover. The cooling fan motor including a heat dissipation structure according to an embodiment of the present invention comprises: a first side cover (530) and a second side cover (550) coupled to the other side of the main cover; and inner ribs (531, 551) formed on the inner surface of the first side cover (530) and the second side cover (550) to correspond to the stator, and the inner ribs are in direct contact with the stator so that heat generated from the stator (100) is released through the inner ribs. By including the inner ribs so that heat generated from the stator is immediately transferred to the housing through the inner ribs without passing through an air layer, the directness and continuity of the heat transfer path are ensured, thereby having a significant effect of suppressing the temperature rise inside the motor.

Description

Technology Field

[0001] The present invention relates to a motor for a cooling fan including a heat dissipation structure, and more specifically, to a motor for a cooling fan including a heat dissipation structure for improving the cooling performance of a motor for a cooling fan used in a high-temperature environment. Background Technology

[0002] Generally, a cooling fan is a cooling device used to release heat generated from various devices, such as electronic devices, vehicles, and industrial equipment, to the outside.

[0003] These cooling fans use a motor as a driving source and are connected to the motor's rotating shaft to generate airflow while rotating, thereby effectively removing heat.

[0004] Motors generate heat during operation due to copper losses in the coils and iron losses in the stator and rotor; if this heat is not properly dissipated, problems such as reduced motor efficiency, insulation breakdown, coil burnout, and bearing deterioration occur.

[0005] To improve this, conventional technology has been proposed to form heat dissipation fins or heat dissipation ribs on the surface of the motor's outer housing to expand the surface area, thereby increasing the contact area with air and enhancing the cooling effect through convection.

[0006] However, as in the conventional technology, the heat dissipation ribs formed on the outer side of the housing help with cooling by air convection, but they do not form a direct heat transfer path with the stator, which is the internal heat source of the motor, so there was a problem in that sufficient cooling efficiency could not be secured. Prior art literature

[0007] Republic of Korea, Registered Patent Publication No. 10-2699926 Republic of Korea, Registered Patent Publication No. 10-2643445 The problem to be solved

[0008] The present invention was created to solve the aforementioned problems and aims to provide a cooling fan motor that includes a heat dissipation structure capable of effectively transferring and discharging heat generated in the stator of the motor to the outside so as to operate stably even in an environment with high external temperatures.

[0009] More specifically, another objective is to improve the heat resistance, cooling performance, durability, and lifespan of the motor by forming a direct heat transfer path between the housing and the stator, increasing the heat dissipation area both outside and inside the housing, and maximizing heat exchange efficiency through the design of cooling channels and thermally conductive fillers. means of solving the problem

[0010] The present invention relates to a cooling fan motor comprising a heat dissipation structure, wherein the cooling fan motor comprises a stator (100) having a coil (C) wound thereon, a rotor (300) rotatably installed in the center of the stator, and a housing (500) in which the stator and rotor are housed. The housing comprises: a ring-shaped main cover (510) formed to surround the outer circumference of the stator (100) and having a cooling channel (515) through which cooling water flows; a first side cover (530) coupled to one side of the main cover; and a second side cover (550) coupled to the other side of the main cover. Inner ribs (531, 551) are formed on the inner circumference of the first side cover (530) and the second side cover (550) to correspond to the stator, and the inner ribs are in direct contact with the stator so that heat generated from the stator (100) is released through the inner ribs.

[0011] In addition, the outer surfaces of the first side cover (530) and the second side cover (550) are characterized by having outer ribs (533, 553) formed to expand the heat dissipation area.

[0012] In addition, the space between the stator (100) and the coil (C) and the first side cover (530) and the second side cover (550) is filled with a heat dissipation filler (570), such as epoxy resin, so that heat generated from the stator (100) is transferred to the side covers (530, 550) through the heat dissipation filler (570).

[0013] In addition, the inner ribs (531, 551) are characterized by being formed of a metal material having a higher thermal conductivity than the heat dissipation filler (570).

[0014] In addition, the inner circumference of the cooling channel (515) is characterized by having a plurality of heat dissipation protrusions (50) formed thereon to improve the heat exchange area with the cooling water.

[0015] In addition, a cooling fan motor comprising a housing (500) comprising a stator (100) on which a coil is wound, a rotor (300) rotatably installed in the inner center of the stator, a ring-shaped main cover (510) provided to surround the outer circumference of the stator (100) and in which the stator and rotor are housed, and a first side cover (530) and a second side cover (550) respectively coupled to both sides of the main cover (510), wherein the cooling fan motor comprises: a heat dissipation filler (570) filled in the space between the stator (100) and the first and second side covers (530, 550); and an inner rib (531, 551) formed to protrude from the inner circumference of the first and second side covers to contact the stator, provided with a material having a higher thermal conductivity than the heat dissipation filler, and serving as a main path for the heat of the stator to be released. It includes a plurality of outer ribs (533, 553) formed on the outer surface of the first side cover (530) and the second side cover (550); wherein the inner ribs (531, 551) are in close contact with the outer surface of the stator (100) and some sections are in contact with the heat dissipation filler (570), so that heat generated from the stator is discharged by simultaneously using a direct conduction path in which it is directly transferred through the inner ribs and an indirect conduction path in which it is transferred to the inner ribs through the heat dissipation filler in parallel. Effects of the invention

[0016] Accordingly, a motor for a cooling fan including a heat dissipation structure according to the present invention can effectively dissipate heat generated during the operation of the motor to the outside, thereby enabling a high-efficiency cooling structure that allows for stable operation even in a high-temperature environment, and the specific effects are as follows.

[0017] A cooling fan motor including a heat dissipation structure according to one embodiment of the present invention forms an inner rib that is in direct contact with the stator inside the housing (side cover), thereby ensuring directness and continuity of the heat transfer path so that heat generated from the stator is immediately transferred to the housing through the inner rib without passing through an air layer, and thus has the effect of suppressing the temperature rise inside the motor.

[0018] In addition, by forming outer ribs on the outer surface of the housing (side cover), the contact area with external air is increased to maximize heat dissipation efficiency through convection and radiation, thereby allowing the external temperature of the motor to be kept low, which has the effect of improving the stability and reliability of the cooling fan.

[0019] In addition, by filling the space between the stator and the housing (side cover) with a heat dissipation filler having a thermal conductivity higher than that of air, heat generated in the stator is efficiently transferred to the housing through the filler, thereby reducing the thermal resistance between the stator and the housing and suppressing the heat generation of the motor.

[0020] In addition, the material of the inner rib is provided with a metal having a higher thermal conductivity than the heat dissipation filler, so that the inner rib becomes the main heat transfer path, thereby allowing the heat of the stator to be released to the outside more quickly.

[0021] As such, the present invention forms a composite heat dissipation path in which inner and outer ribs, heat dissipation filler, and side cover are integrated, thereby having the effect of significantly improving heat dissipation efficiency compared to a motor having a single heat dissipation path.

[0022] Furthermore, the present invention improves heat exchange efficiency by increasing the contact area with the cooling water through the formation of a plurality of heat dissipation protrusions inside the cooling channel. In particular, it has the effect of improving the cooling efficiency of the motor by causing turbulence to be formed by the shape and arrangement of the heat dissipation protrusions as the cooling water flows through the cooling channel. Brief explanation of the drawing

[0023] FIG. 1 is a perspective view of a motor for a cooling fan including a heat dissipation structure according to the present invention. FIG. 2 is an exploded perspective view of a motor for a cooling fan including a heat dissipation structure according to the present invention. Figure 3 is a cross-sectional view along line A-A' of Figure 1. FIG. 4 is a drawing showing an example of a heat dissipation protrusion formed in a cooling channel according to the present invention. FIG. 5(a) is a drawing showing the inner surface of the first side cover according to the present invention, and FIG. 5(b) is a drawing showing the inner surface of the second side cover. FIG. 6(a) is a drawing showing the outer surface of the first side cover according to the present invention, and FIG. 6(b) is a drawing showing the outer surface of the second side cover. FIG. 7 is a drawing showing the results of improving the cooling performance of a motor for a cooling fan including a heat dissipation structure according to the present invention. Specific details for implementing the invention

[0024] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings.

[0025] However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms, and the embodiments provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0026] Furthermore, the terms used in this specification are for the purpose of describing embodiments and are not intended to limit the invention.

[0027] In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used in this specification, "comprises" and / or "comprising" do not exclude the presence or addition of other components other than those mentioned.

[0028] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning that is commonly understood by those skilled in the art to which the present invention belongs.

[0030] FIG. 1 is a perspective view of a motor for a cooling fan including a heat dissipation structure according to the present invention, FIG. 2 is an exploded perspective view of a motor for a cooling fan including a heat dissipation structure according to the present invention, and FIG. 3 is a cross-sectional view taken along line A-A' of FIG. 1.

[0031] As illustrated in FIGS. 1 to 3, a motor (1000) for a cooling fan according to the present invention comprises a stator (100), a rotor (300), and a housing (500).

[0032] First, the stator (100) is fixedly installed on the inner circumference of the housing (500) and is a structure having a plurality of slots formed therein where a coil (C) is wound, and forms a magnetic field when current is applied and performs the role of inducing rotation of the rotor (300) to be described later.

[0033] Next, the rotor (300) is a component installed inside the housing (500) and rotatably positioned in the center of the stator (100), and generates rotational force according to the change in magnetic flux of the stator (100).

[0034] A permanent magnet is attached to the outer surface of the rotor, and this permanent magnet interacts with the magnetic field formed when current is applied to the coil (C) of the stator (100) to generate rotational torque in the rotor (300).

[0035] Due to this structure, when current is applied to the coil (C), the stator (100) forms a strong magnetic field, and this magnetic field interacts with the permanent magnet attached to the rotor (300) to generate rotational force.

[0036] Additionally, a shaft (S) is installed at the center of the rotor (300), and the shaft (S) is rotatably supported by the housing (500) by means of a ball bearing or the like, so that the rotational force of the rotor (300) is transmitted to the fan blade through the shaft.

[0038] Finally, the above housing (500) is a component that incorporates components constituting a cooling fan motor and forms the exterior of the motor.

[0039] The above housing (500) protects the stator (100) and rotor (300) from the external environment and simultaneously serves as a heat dissipator that transfers heat generated internally during motor operation to the outside.

[0040] More specifically, the housing (500) includes a ring-shaped main cover (510) and a first side cover (530) and a second side cover (550) that are respectively coupled to both sides of the main cover.

[0041] The main cover (510) is a ring-shaped cover member provided to surround the outer circumference of the stator (100), and a cooling channel (515) through which cooling water flows is formed inside it.

[0042] The above cooling channel (515) performs the function of transferring and releasing heat inside the housing (500) to the outside through the circulation of cooling water.

[0043] On the outer surface of the main cover (510), an inlet (511) through which cooling water flows in and an outlet (513) through which cooling water is exposed are respectively formed for the circulation of cooling water, and these inlets (511) and outlets (513) are connected to a cooling channel (515) so that the cooling water circulates inside the main cover (510), absorbs heat, and is discharged to the outside.

[0044] A plurality of heat dissipation protrusions (50) are formed inside the above-mentioned cooling channel (515) to improve cooling efficiency.

[0045] FIG. 4 is a drawing showing an example of a heat dissipation protrusion formed in a cooling channel according to the present invention.

[0046] The above heat dissipation protrusion (50) is formed to protrude from the inner wall of the cooling channel (515), thereby increasing the contact area with the cooling water when the cooling water flows along the cooling channel (515), so as to improve the heat exchange efficiency.

[0047] As shown in FIG. 4 (a), (b), and (c), the heat dissipation protrusions (50) may be provided in various forms, and depending on the shape, spacing, and arrangement structure of the heat dissipation protrusions (50), the flow of the cooling water may be partially disturbed to generate fine turbulence, thereby having the effect of improving heat exchange efficiency.

[0048] In addition, a guide rib (not shown in the drawing) for controlling the flow of cooling water may be further formed inside the cooling channel (515).

[0049] The above guide ribs control the flow direction of the cooling water to twist or rotate the flow of the cooling water, thereby forming a vortex inside the cooling channel, which increases the residence time of the cooling water and maximizes heat exchange efficiency.

[0050] As such, the cooling channel (515) according to the present invention includes a heat dissipation protrusion (50) that expands the contact area with the cooling water and a guide rib (not shown in the drawing) that controls the flow of the cooling water to form a vortex, thereby allowing the heat inside the motor to be quickly released to the outside.

[0052] FIG. 5(a) is a drawing showing the inner surface of a first side cover according to the present invention, FIG. 5(b) is a drawing showing the inner surface of a second side cover, FIG. 6(a) is a drawing showing the outer surface of a first side cover according to the present invention, FIG. 6(b) is a drawing showing the outer surface of a second side cover.

[0053] Next, as illustrated in FIGS. 5 and 6, the first side cover (530) and the second side cover (550) are disc-shaped cover members that are respectively attached to both sides of the main cover (510), and they protect the stator (100) and rotor (300) placed inside the housing while simultaneously discharging heat generated inside the motor to the outside.

[0054] In the present invention, to dissipate heat generated in the stator (100) and coil (C), a heat dissipation filler (570) is filled in the space between the stator (100) and coil (C) and the first and second side covers (530, 550).

[0055] The above heat dissipation filler (570) is a heat-conducting filler having a higher thermal conductivity than air, and is composed of a material that has electrical insulation properties while also providing heat dissipation properties.

[0056] In the present invention, epoxy resin was used as an example of a heat dissipation filler, but the present invention is not limited thereto, and it is preferable that it be made of a silicone-based resin, a polyurethane-based resin, or other thermally conductive insulating material.

[0057] The above heat dissipation filler (570) completely fills the space between the stator (100) and the first and second side covers (530, 550) so that no gap is created, and accordingly, heat generated from the stator (100) is directly transferred to the housing (500) through the filler (570) without passing through an air layer.

[0058] As a result, the thermal resistance between the stator (100) and the housing (500) is reduced, and the heat generated during motor operation is suppressed, thereby mitigating the temperature rise of the motor and improving its durability and lifespan.

[0059] And as shown in FIG. 5, edge ribs (E) are formed on the edges of the first side cover (530) and the second side cover (550) so that the heat dissipation filler is stably filled inside the housing.

[0060] The above edge rib (E) is formed to protrude continuously in a circumferential direction along the edge of the side cover, so that the heat dissipation filler (570) is stably filled inside the housing.

[0061] In other words, one end of the heat dissipation filler is in close contact with the inner rib, and the other end is in close contact with the edge rib.

[0062] Accordingly, the phenomenon of the heat dissipation filler (570) leaking out during the curing process can be prevented, and the volume and contact area of ​​the heat dissipation filler are maintained at a constant level, thereby ensuring stable heat transfer efficiency with the inner ribs (531, 551).

[0064] In addition, inner ribs (531, 551) are formed on the inner surface of the first side cover (530) and the second side cover (550) so as to be in direct contact with the stator (100).

[0065] The inner ribs (531, 551) are formed to protrude inwardly on the inner surface of the first side cover (530) and the second side cover (550), and are formed in a ring shape to contact the outer surface of the stator, thereby serving as a heat transfer path that allows heat generated from the stator (100) to be transferred directly to the housing (500) without passing through an air layer.

[0066] The inner ribs (531, 551) are formed from a material such as aluminum, copper, or an alloy thereof that has a higher thermal conductivity than the heat dissipation filler (570), so that the inner ribs (531, 551) function as the main heat transfer path. As a result, heat generated in the stator is released to the outside more quickly and efficiently through the inner ribs.

[0067] That is, the heat generated in the stator (100) is released to the housing (500) through heat transfer via the heat dissipation filler (570) and also through direct conduction via the inner ribs (531, 551).

[0068] As such, the present invention ensures directness and continuity of the heat transfer path by ensuring that the heat generated in the stator (100) is directly transferred to the housing (500) through the inner ribs (531, 551) without passing through an air layer. Accordingly, the temperature rise inside the motor is suppressed, and the coil insulation and magnetic flux stability are improved, thereby increasing the durability and lifespan of the motor.

[0069] In addition, as shown in FIG. 3, the inner ribs (531, 551) are in close contact with the outer surface of the stator (100), and since a portion of them are in contact with the heat dissipation filler (570), the heat released from the stator (100) is transferred to the inner ribs (531, 551) through the heat dissipation filler (570).

[0070] Therefore, the heat generated in the stator (100) utilizes a direct conduction path through the inner rib and an indirect conduction path through the heat dissipation filler to the inner rib simultaneously in parallel, so the total thermal resistance is reduced and the heat dissipation efficiency is improved.

[0071] In addition, the inner ribs (531, 551) come into contact with the heat dissipation filler (570) and absorb the heat, thereby uniformly dispersing the heat around the stator and improving the temperature stability of the motor.

[0072] Additionally, as shown in FIG. 3, the motor (1000) has a stator (100) positioned on the outer side centered on the inner ribs (531, 551), and a heat dissipation filler (570) filled in the space between the stator and the housing (500).

[0073] Additionally, a rotor (300) is disposed on the inner side of the inner ribs (531, 551), and an air layer (310) is formed between the rotor (300) and the housing (500).

[0074] As such, a heat dissipation filler (570) with high thermal conductivity is placed on the outer side based on the inner ribs (531, 551), and an air layer (310) with low thermal conductivity is formed on the inner side, so heat transfer between the rotor (300) and the stator (100) is mitigated, thereby providing a thermal buffering effect.

[0075] Preferably, the free end portion of the inner rib (531, 551) may further include a small-width flat contact portion (not shown in the drawing) having a predetermined area. By further including the flat contact portion, the contact area between the inner rib and the stator can be increased, and stable contact between the inner rib and the stator can be secured, thereby transferring heat from the stator to the inner rib more quickly and efficiently, and further improving the heat dissipation effect.

[0077] Meanwhile, outer ribs (533, 553) are formed protruding outwardly on the outer surfaces of the first side cover (530) and the second side cover (550), so that heat generated from the motor can be easily dissipated through contact with the outside air.

[0078] In other words, the heat conducted to the housing through the inner ribs and heat dissipation filler is effectively dissipated to the outside through the outer ribs.

[0079] As illustrated in FIG. 6, in the present invention, as an example of an outer rib, a plurality of radial outer ribs (533a, 553a) are arranged radially on the outer surface of the side cover, and a plurality of ring-shaped outer ribs (533b, 553b) are formed protruding in a ring shape on the outer surface of the side cover, spaced apart at regular intervals in the radial direction from the center of the side cover, and formed to have progressively larger diameters.

[0080] At this time, the radial outer ribs (533a, 553a) and ring-shaped outer ribs (533b, 553b) are formed in a shape that intersects or overlaps each other, so that the outer surface area of ​​the housing (500) is greatly expanded.

[0081] Accordingly, as the surface area of ​​the housing in contact with the outside air increases, heat dissipation efficiency is maximized, thereby improving the motor's heat dissipation performance, cooling efficiency, and reliability.

[0082] In addition, in the case of the second side cover (550) above, an irregular protrusion is formed on the outer surface by the structure of the motor, and a grid-patterned outer rib is formed on the outer surface of the protrusion, and this rib structure can be varied in various ways depending on the shape of the housing or installation conditions.

[0084] FIG. 7 is a drawing showing the results of improving the cooling performance of a motor for a cooling fan including a heat dissipation structure according to the present invention.

[0085] In the present invention, the thermal flow characteristics of a cooling fan motor to which the heat dissipation structure of the present invention is applied were simulated using Computational Fluid Dynamics (CFD) analysis.

[0086] Figure 7(a) shows the temperature distribution when a conventional general motor is in operation, and the maximum temperature inside the motor was found to be about 234°C.

[0087] Figure 7(b) shows the temperature distribution when the motor is driven with only the heat dissipation filler (570) formed, and the maximum temperature inside the motor was found to be about 107°C.

[0088] Figure 7 (c) shows the temperature distribution when a heat dissipation filler (570) is formed and a heat dissipation protrusion (50) is additionally formed inside the cooling channel, and the maximum temperature inside the motor is about 106°C.

[0089] Next, FIG. 7(d) shows the temperature distribution when the heat dissipation filler (570) and the heat dissipation protrusion (50) of the cooling channel are formed, and additionally, inner ribs (531, 551) are formed on the side covers (530, 550), and the maximum temperature inside the motor is approximately 103°C.

[0090] In addition, FIG. 7(e) shows the temperature distribution when the heat dissipation filler (570), the heat dissipation protrusion (50) of the cooling channel, the inner ribs (531, 551) and outer ribs (533, 553) of the side cover are all formed, and the maximum temperature inside the motor is about 99°C, which corresponds to an embodiment in which the heat dissipation structure of the present invention is complete.

[0091] As a result of the analysis, as confirmed in the comparison of Figures 7 (a) to (e), it was confirmed that the maximum temperature inside the motor gradually decreases as the heat dissipation structure is added step by step.

[0092] In particular, in an embodiment of the present invention with added inner ribs and outer ribs, a temperature reduction effect of about 58% or more compared to a conventional motor (234 °C) is observed, confirming that the cooling efficiency has been significantly improved.

[0093] Thus, the present invention forms a composite heat dissipation path in which the inner ribs (531, 551) of the side cover, the heat dissipation filler (570), and the outer ribs (533, 553) of the side cover are combined with each other, so that heat generated inside the motor is quickly and efficiently released to the outside.

[0094] The heat dissipation structure of the present invention configured as described above has significantly improved heat dissipation efficiency compared to a conventional motor having a single conduction path, and has the effect of stably suppressing the temperature rise of the motor even in high-temperature environments.

[0096] Although the present invention has been described above with reference to the embodiments illustrated in the drawings, this is merely for the purpose of explaining the invention, and a person skilled in the art to which the present invention pertains will understand that various modifications or equivalent embodiments are possible from the detailed description of the invention.

[0097] Therefore, the true scope of rights of the present invention must be determined by the technical concept of the patent claims. Explanation of the symbols

[0099] 1000: Motor for cooling fan 100: Stator 300: Rotor 310: Air layer 500: Housing 510: Main cover 511: Inlet 513: Outlet 515: Cooling channel 530: 1st side cover 550: 2nd side cover 531, 551: Medial rib 533, 553: Lateral rib 533a, 553a: Radial lateral ribs 533b, 553b: Ring-shaped lateral ribs 570: Heat dissipation filler C: Coil E: Edge Rib S: Shaft

Claims

Claim 1 A motor for a cooling fan comprising a stator (100) having a coil (C) wound thereon, a rotor (300) rotatably installed in the center of the stator, and a housing (500) in which the stator and rotor are housed, wherein the housing comprises: a ring-shaped main cover (510) formed to surround the outer circumference of the stator (100) and having a cooling channel (515) formed therein through which cooling water flows; and a first side cover (530) coupled to one side of the main cover. The invention comprises a second side cover (550) coupled to the other side of the main cover; wherein inner ribs (531, 551) are formed on the inner surface of the first side cover (530) and the second side cover (550) to correspond to the stator, and the inner ribs are in direct contact with the stator so that heat generated from the stator (100) is released through the inner ribs; wherein a heat dissipation filler (570), such as epoxy resin, is filled in the space between the stator (100) and the coil (C) and the first side cover (530) and the second side cover (550), so that heat generated from the stator (100) is transferred to the side covers (530, 550) through the heat dissipation filler (570); and wherein the inner ribs (531, 551) are formed of a metal material having a higher thermal conductivity than the heat dissipation filler (570). A cooling fan motor including a heat dissipation structure. Claim 2 A motor for a cooling fan comprising a heat dissipation structure, characterized in that, in claim 1, outer ribs (533, 553) for expanding the heat dissipation area are formed on the outer surfaces of the first side cover (530) and the second side cover (550). Claim 3 delete Claim 4 delete Claim 5 A motor for a cooling fan comprising a heat dissipation structure, characterized in that, in claim 1, a plurality of heat dissipation protrusions (50) are formed on the inner circumference of the cooling channel (515) to improve the heat exchange area with the cooling water. Claim 6 A cooling fan motor comprising a stator (100) having a coil wound thereon, a rotor (300) rotatably installed in the inner center of the stator, a ring-shaped main cover (510) provided to surround the outer periphery of the stator (100) and in which the stator and rotor are housed, and a housing (500) composed of a first side cover (530) and a second side cover (550) respectively coupled to both sides of the main cover (510), wherein the cooling fan motor comprises an inner rib (531, 551) formed to protrude from the inner circumference of the first side cover and the second side cover to contact the stator and serving as a main path for discharging heat from the stator; A cooling fan motor comprising a heat dissipation structure including a heat dissipation filler (570) filled in the space between the stator (100) and the first and second side covers (530, 550); wherein the space between the stator (100) and the coil (C) and the first side cover (530) and the second side cover (550) is filled with a heat dissipation filler (570), such as epoxy resin, so that heat generated from the stator (100) is transferred to the side covers (530, 550) through the heat dissipation filler (570); and wherein the inner ribs (531, 551) are formed of a metal material having a higher thermal conductivity than the heat dissipation filler (570).

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