Motor with heat dissipation structure and treadmill comprising same

Abstract

The present disclosure provides a motor with a heat dissipation structure, comprising: a motor body comprising a motor housing and an output shaft; a fan mounted to the output shaft, the fan comprising a first end plate; wherein the motor further comprises a fan cover located between the fan and one end of the motor body, the fan cover comprising a mounting portion and a sealing portion, the mounting portion being mounted to the motor body, and the sealing portion at least partially coinciding with the first end plate of the fan in an axial direction. The present disclosure also provides a treadmill comprising the motor.

Description

Technical Field

[0001] This disclosure relates to an electric motor with a heat dissipation structure and a treadmill including the electric motor. Background Technology

[0002] Currently, treadmills and similar equipment, due to limited installation space and high input power requirements, generally employ a slender motor design, resulting in narrow internal airflow channels and increased difficulty in heat dissipation. Traditional cooling solutions often use external centrifugal fans, but these suffer from insufficient sealing or complex structures. For example, directly mounting the fan results in low airflow efficiency, or using complex sealing structures increases costs, making it difficult to balance efficient heat dissipation with economy. Furthermore, the lack of targeted design for the centrifugal fan and motor leads to uneven heat dissipation, making it difficult to achieve efficient thermal management within limited space. Therefore, there is an urgent need for a simple, reliable, and efficient cooling solution. Utility Model Content

[0003] To address the above problems, according to a first aspect of this disclosure, a motor with a heat dissipation structure is proposed, comprising: a motor body including a motor housing and an output shaft; a fan mounted to the output shaft; wherein the motor further comprises a fan cover located between the fan and one end of the motor body, the fan cover including a mounting portion and a sealing portion, the mounting portion being mounted to the motor body, and the sealing portion overlapping the fan portion in the axial direction.

[0004] By designing a fan shroud at one end of the motor body and ensuring that the fan shroud and the fan structure work together, all the airflow inside the motor can be guided to be discharged through the fan, preventing the airflow from the motor body from leaking out of the motor before reaching the fan inlet. This effectively increases suction and improves heat dissipation efficiency. The structure is simple, has low manufacturing cost, and provides reliable and efficient heat dissipation.

[0005] The motor with a heat dissipation structure according to this disclosure may have one or more of the following features.

[0006] According to one embodiment, the motor housing includes a housing and a rear end cover, the rear end cover being mounted to the rear end of the housing, and the fan cover being fixedly mounted to the rear end cover.

[0007] According to one embodiment, the sealing portion is an annular portion extending in the axial direction, and the mounting portion extends radially inward from the inner circumferential surface of the sealing portion.

[0008] According to one embodiment, the fan cover is provided with a mounting bracket for abutting against the rear end face of the rear end cover in the axial direction and for being fixedly connected to the rear end cover.

[0009] According to one embodiment, the mounting portion has one or more openings corresponding to the mounting bracket, the mounting bracket being closer to the rear end cover in the axial direction than the openings.

[0010] According to one embodiment, the mounting bracket includes an axial segment and a radial segment, the axial segment extending from the opening toward the rear end cover and forming part of the seal, and the radial segment adjacent to the axial segment and extending inward from the inner circumferential surface of the axial segment.

[0011] According to one embodiment, the rear end cover includes a mounting groove that extends radially outward to the outer circumferential surface of the rear end cover, and the shape of the mounting groove is configured such that the mounting bracket can be embedded in the mounting groove during installation.

[0012] According to one embodiment, the rear end cover includes a plurality of vents distributed in a circumferential direction, and the inner diameter of the mounting portion of the fan cover is larger than the outer diameter of the vents.

[0013] According to one embodiment, the fan includes a hub, a second end plate, and blades, wherein the second end plate extends obliquely from the hub toward a direction away from the motor body to a circumference equal to the outer diameter of the housing, and the extension direction of the second end plate has a first included angle relative to the radial direction.

[0014] According to one embodiment, the first end plate is annular, and the outer diameter of the first end plate is smaller than the outer diameter of the second end plate, and the inner diameter of the first end plate is equal to the middle diameter of the vent of the rear end cover.

[0015] According to one embodiment, the outer diameter of the first end plate is smaller than the inner diameter of the sealing portion of the fan shroud, and the sealing portion at least partially overlaps with the first end plate in the axial direction.

[0016] According to one embodiment, the front side of the first end plate extends in a radial direction, and the rear side of the first end plate is inclined in a direction away from the motor body and has a second included angle relative to the radial direction.

[0017] According to one embodiment, the overlap length between the sealing portion and the first end plate is 1 / 2 to 2 / 3 of the radial outermost axial thickness of the first end plate.

[0018] According to one embodiment, the first included angle is greater than the second included angle.

[0019] According to one embodiment, an annular groove is provided on the front side of the first end plate.

[0020] According to one embodiment, the fan is a centrifugal fan, and the blades include a first blade and a second blade arranged alternately in a circumferential direction around a hub, wherein the length of the first blade is greater than the length of the second blade.

[0021] According to one embodiment, the first blade includes a first straight section and an inclined section, the inclined section being adjacent to the first straight section of the first blade and extending radially inward to the hub; and the second blade includes a second straight section and a first inclined section, the first inclined section being adjacent to the second straight section of the second blade and extending radially inward to a circumference equal to the inner diameter of the vent of the rear end cover.

[0022] According to one embodiment, the height of the inclined section of the first blade in the axial direction gradually decreases from the outside to the inside in the radial direction.

[0023] According to one embodiment, the second blade further includes a second inclined segment adjacent to the first inclined segment, the second inclined segment extending radially inward to a circumference of 1 / 2 to 2 / 3 of the length of the first blade.

[0024] According to one embodiment, the height of the second inclined section of the second blade in the axial direction gradually decreases from the outside to the inside in the radial direction.

[0025] According to one embodiment, the motor further includes a front end cover and an inertia wheel, the front end cover being mounted to the front end of the housing, the inertia wheel being located at the end of the output shaft away from the fan, and the outer circumferential portion of the inertia wheel extending toward the motor body beyond the front end cover.

[0026] According to one embodiment, the air intake side of the inertia wheel is provided with a chamfer.

[0027] According to a second aspect of this disclosure, a treadmill is provided, including a motor as described in any of the preceding claims. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments of this disclosure will be briefly described below. The drawings are merely illustrative of some embodiments of this disclosure and are not intended to limit all embodiments of this disclosure to them.

[0029] Figure 1 An overall cross-sectional view of an electric motor according to an embodiment of the present disclosure is shown;

[0030] Figure 2 An exploded view of an electric motor according to an embodiment of the present disclosure is shown;

[0031] Figure 3A perspective view of a fan cover and a rear end cover according to an embodiment of the present disclosure is shown;

[0032] Figure 4 A front view of the rear end cover according to an embodiment of the present disclosure is shown;

[0033] Figure 5 A perspective view of a centrifugal fan according to an embodiment of the present disclosure is shown;

[0034] Figure 6 A front view of a centrifugal fan according to an embodiment of the present disclosure is shown, wherein the first end plate of the centrifugal fan is removed;

[0035] Figure 7 A cross-sectional view of a centrifugal fan according to an embodiment of the present disclosure is shown;

[0036] Figure 8 A schematic diagram of the airflow direction according to an embodiment of the present disclosure is shown. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0038] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0039] The present disclosure will now be described in detail by way of example embodiments.

[0040] Now refer to Figure 1 and Figure 2 Describe the overall structure of the motor. Figure 1 An overall cross-sectional view of an electric motor according to an embodiment of the present disclosure is shown. Figure 2 An exploded view of an electric motor according to an embodiment of the present disclosure is shown.

[0041] like Figure 1 As shown, this disclosure proposes a motor with a heat dissipation structure, including a motor body 1, a fan 2 and a fan cover 3. The motor body 1 includes a motor housing 11 and an output shaft 12. The fan 2 is mounted to the output shaft 12 and includes a first end plate 22. The fan cover 3 is located between one end of the fan 2 and the motor body 1. The fan cover 3 includes a mounting part 31 and a sealing part 32. The mounting part 31 is mounted to the motor body 1. At least a portion of the sealing part 32 is located outside the fan 2 in the radial direction and at least partially overlaps with the first end plate 22 of the fan 2 in the axial direction.

[0042] By designing a fan shroud at one end of the motor body and ensuring that the fan shroud and the fan structure work together, all the airflow inside the motor can be guided to be discharged through the fan, preventing the airflow from the motor body from leaking out of the motor before reaching the fan inlet. This effectively increases suction and improves heat dissipation efficiency. The structure is simple, has low manufacturing cost, and provides reliable and efficient heat dissipation.

[0043] The motor housing 11 according to this disclosure may further include a housing 113 and a rear end cover 112, the rear end cover 112 being installed at the rear end of the housing, and the fan cover 3 being fixedly installed between the rear end cover 112 and the fan. A ventilation opening for heat dissipation is provided on the front end face of the housing. The housing of the motor housing shown in the accompanying drawings of this disclosure is a single piece; however, those skilled in the art will understand that the housing may also be formed by two parts being snapped together, and the front end cover and rear end cover may be omitted. Accordingly, the ventilation openings for heat dissipation may be provided on the front and rear end faces of the housing, and the fan cover may be installed on the front or rear end of the housing. Those skilled in the art will understand that the heat dissipation structure of this disclosure is not limited to the specific structure of the motor housing, and the motor housing may have various embodiments.

[0044] According to this disclosure, the motor housing 11 may further include a front cover 111, a rear cover 112, and a housing 113 installed between the front cover 111 and the rear cover 112. The front cover 111, the rear cover 112, and the housing 113 are fastened together. The fan cover 3 is fixed to the housing 113 along with the front cover 111 and the rear cover 112 by long tie rod screws 13. The motor housing 113, permanent magnets, etc., constitute the stator of the motor. The front cover 111, the rear cover 112, and their bearings provide support for the rotor system. The rotor core, its windings, commutator, etc., are connected in series on the output shaft 12 (i.e., the rotor shaft) and provide support for the entire rotor system through bearings on the two end covers. The fan 2 is installed on the output shaft 12, for example, the fan 2 can be installed on the rear end of the output shaft 12 extending from the rear cover 112, and rotates with the output shaft 12 of the motor. The inertia wheel 4 can be installed on the front end of the output shaft 12 extending from the front cover 111 to improve the system stability during motor operation.

[0045] like Figure 1 and Figure 2 As shown, the fan cover 3 is located between one end of the fan 2 and the motor body 1. For example, the fan cover 3 can be fixedly installed to the rear end cover 112 of the motor housing 11. Both the front end cover 111 and the rear end cover 112 are provided with ventilation openings 1122, and the air intake of the fan 2 is positioned opposite to the ventilation opening 1122 of the rear end cover 112. When the motor is running, the airflow, under the action of the fan 2, enters the channel between the inertia wheel 4 and the housing 113 from outside the housing 113, then enters the air duct inside the motor body 1 through the ventilation opening 1122 of the front end cover 111, and finally enters the air intake of the fan 2 through the ventilation opening 1122 of the rear end cover 112. In this document, the fan 2 can be a centrifugal fan; those skilled in the art will understand that the fan 2 can also be any other suitable type of fan device.

[0046] In this article, "front" and "back" are used only to indicate the relative positional relationship between the components in the axial direction of the motor. For example, "backward" means in the direction of airflow and "forward" means against the direction of airflow, and they do not have a restrictive function.

[0047] Figure 3 A perspective view of a fan shroud 3 and a rear end cover 112 according to an embodiment of the present disclosure is shown. Figure 3 As shown, according to an embodiment of this application, the fan shroud 3 includes a mounting portion 31 and a sealing portion 32. The sealing portion 32 is an annular portion extending in the axial direction. The mounting portion 31 extends radially inward from the inner circumferential surface of the sealing portion 32 to a mounting sealing surface, and the mounting portion 31 is used for mounting to the motor body 1. At least a portion of the sealing portion 32 is located outside the centrifugal fan in the radial direction and partially overlaps with the fan 2 in the axial direction (e.g., Figure 1As shown in the figure, the sealing part 32 can cooperate with the fan 2 to reduce the external airflow entering the fan cover 3 through the gap.

[0048] See further Figure 3 The fan shroud 3 is provided with a mounting bracket 33 for abutting against the rear end face 1125 of the rear end cover 112 in the axial direction and for fixed connection with the rear end cover 112. The mounting portion 31 has one or more openings 311 corresponding to the mounting bracket 33, which is closer to the rear end cover 112 in the axial direction than the openings 311. The mounting bracket 33 includes an axial section 331 and a radial section 332. The axial section 331 extends from the opening 311 toward the rear end cover 112 and forms part of an annular sealing portion 32. The radial section 332 abuts the axial section 331 and extends inward from the inner circumference of the axial section 331, thus forming an L-shaped mounting bracket 33. A through hole is provided in the radial section 332 for a long tie rod screw 13 to pass through. Furthermore, the mounting portion 31 may also be provided with two threaded through holes 1123 for auxiliary screws 34 to pass through for further fixed connection to the rear end cover 112.

[0049] Figure 4 A front view of a rear end cover 112 according to an embodiment of the present disclosure is shown. Figure 3 and Figure 4 As shown, the rear end cover 112 includes a mounting groove 1121 for mounting a nut 14 that mates with a long tie rod screw 13. A screw hole 1124 is provided in the mounting groove 1121 for the long tie rod screw to pass through. The mounting groove 1121 extends axially forward from the rear end face 1125 by a distance equal to the axial dimension of the axial segment 331 of the mounting bracket 33. The mounting groove 1121 extends radially outward to the outer circumferential surface of the rear end cover 112, and its shape is configured such that the mounting bracket 33 can be inserted into the mounting groove 1121 during installation. Figure 3 and Figure 4 In the example shown, there are two openings 311, which are symmetrically arranged around the circumference of the mounting portion 31. Correspondingly, there are also two mounting grooves 1121, which are also symmetrically arranged. However, those skilled in the art will understand that the number of openings 311 and mounting grooves 1121 may be more than two, such as four or six, and this disclosure is not limited thereto.

[0050] During installation, the L-shaped mounting bracket 33 is embedded in the groove of the rear end cover 112. The radial section 332 of the mounting bracket 33 fits against the end face of the mounting groove 1121. The through holes on the mounting bracket 33 correspond to the through holes on the mounting groove 1121 of the rear end cover 112. At this time, the end face of the mounting part 31 also fits against the end face of the rear end cover 112. Simultaneously, the two screw through holes on the mounting sealing surface correspond to the screw holes on the end face of the rear end cover 112. The L-shaped mounting bracket 33 of the fan cover 3 can be embedded in the mounting groove 1121 of the rear end cover 112. Using the existing long tie rod screw 13 installation method, the fan cover 3, the front end cover 111, the rear end cover 112, and the housing 113 can be connected together, thereby positioning the fan cover 3 well and facilitating the overall installation of the motor. By setting two additional auxiliary screws 34 to connect the mounting part 31 and the rear end cover 112, it is ensured that the mounting sealing surface of the fan cover 3 fits better against the rear end face 1125 of the rear end cover 112 and the installation is strengthened.

[0051] like Figure 4 As shown, the rear cover 112 includes a plurality of vents 1122 distributed in the circumferential direction. The vents 1122 are positioned to avoid the mounting grooves 1121, and their shape can be annular, fan-shaped, or irregular to maximize the ventilation area. Figure 4 As shown, the outer diameter of the vent 1122 of the rear end cover 112 is denoted as D1, the inner diameter of the vent 1122 of the rear end cover 112 is denoted as D3, and the middle diameter of the vent 1122 of the rear end cover 112 is denoted as D2, i.e., D2 = (D1 + D3) / 2. The inner diameter of the mounting part 31 of the fan cover 3 is larger than the outer diameter D1 of the vent 1122, thereby allowing airflow to pass smoothly through the vent 1122 of the rear end cover 112.

[0052] The centrifugal fan setup is described below with reference to the attached diagram. Figure 5 A perspective view of a centrifugal fan according to an embodiment of the present disclosure is shown. Figure 6 A front view of a centrifugal fan according to an embodiment of the present disclosure is shown, wherein the first end plate 22 of the centrifugal fan is removed. Figure 7 A cross-sectional view of a centrifugal fan according to an embodiment of the present disclosure is shown.

[0053] like Figure 5As shown, the fan 2 may further include a hub 21, a second end plate 23, and blades. The hub 21 includes a shaft hole that mates with the rear end of the motor output shaft 12. The first end plate 22 is annular, forming an air intake 224 in the center. The second end plate 23 is disc-shaped. In the axial direction, the front and rear ends of the blades are fixedly connected to the first end plate 22 and the second end plate 23, respectively. In the perspective shown in the example of this disclosure, the first end plate may be located on the side of the fan closer to the housing, hence the first end plate may also be referred to as the front plate; correspondingly, the second end plate may be located on the side of the fan farther from the housing, hence the second end plate may also be referred to as the rear plate.

[0054] like Figure 7 As shown, the second end plate 23 of the fan 2 is inclined, extending from the hub 21 toward a direction away from the motor body 1, and reaching a circumference equal to the outer diameter of the housing 113. The extending direction of the second end plate 23 has a first included angle α with respect to the radial direction.

[0055] like Figure 7 As shown, the front side 221 of the first end plate 22 extends radially, and the rear side 222 of the first end plate 22 is inclined away from the motor body 1 and has a second included angle β relative to the radial direction. That is, the front side of the first end plate 22 is a planar structure, and the rear side near the blade is an inclined structure. In this way, the first end plate 22 is thinner on the inner diameter side and thicker on the outer circumference side. The thicker outer circumference side increases the overlapping area with the sealing part 32 of the fan cover 3, which facilitates sealing when the fan is working.

[0056] In some examples, the first included angle α of the second end plate 23 can be greater than the second included angle β of the first end plate 22. The first included angle α can range from 15° to 25°, and the second included angle β can range from 5° to 10°. In this way, the flow channel between the first end plate 22 and the second end plate 23 gradually expands outward from the hub 21. On the one hand, the inclined structure allows the airflow passing through the blades to have a longer work process. On the other hand, the inclined structure causes the airflow flowing out from the rear end cover 112 in the axial direction to flow obliquely backward. Compared with the forced airflow deflection of the straight second end plate 23, the inclined second end plate 23 makes the airflow smoother and the flow loss smaller. In addition, the gradually expanding structure facilitates processing during mold forming.

[0057] like Figure 7 As shown, the inner diameter d1 of the first end plate 22 (i.e., the diameter of the air intake 224 of the first end plate 22) can be equal to the middle diameter D2 of the ventilation opening 1122 of the rear end cover 112, i.e., d1=D2. In this way, sufficient blade sealing area is ensured, while axial airflow from the rear end cover 112 can smoothly enter the blade passage of the centrifugal fan.

[0058] The outer diameter of the first end plate 22 can also be smaller than the inner diameter of the sealing part 32 of the fan shroud 3. The sealing part 32 at least partially overlaps with the first end plate 22 in the axial direction. Specifically, the outer circumferential surface of the first end plate 22 is opposite to the inner circumferential surface of the sealing part 32 of the fan shroud 3. The first end plate 22 extends into the interior of the fan shroud 3 in the axial direction. The overlapping area between the two in the axial direction is 1 / 2 to 2 / 3 of the axial thickness of the outer circumferential surface of the first end plate 22. This ensures that there is a sufficient overlapping area for sealing, while reserving space for the axial movement of the rotor system. There is also a certain gap between the two in the radial direction for relative rotation.

[0059] The outer diameter of the first end plate 22 of the fan 2 can be smaller than the outer diameter of the second end plate 23, and the second end plate 23 extends to a circumference equal to the outer diameter of the housing 113, with the outermost tip of the blades extending to be flush with the outer diameter of the second end plate 23. This non-equal outer diameter design of the first and second end plates allows the impeller outer diameter to be maximized without exceeding the outer diameter of the housing 113, thus generating greater suction. Simultaneously, it ensures axial sealing on the first end plate side, while ensuring that the overall outer diameter of the fan at the rear does not exceed the housing 113.

[0060] To reduce the weight of the first end plate, several annular grooves 223 are provided on the front side (i.e., the planar side) of the first end plate 22.

[0061] like Figure 5 and Figure 6 As shown, the centrifugal blades adopt the form of long and short blades, that is, the blades of the fan 2 include a first blade 24 and a second blade 25, which are arranged alternately around the hub 21 in the circumferential direction, and the length of the first blade 24 is greater than the length of the second blade 25.

[0062] The first blade 24 (i.e., the long blade) may include a first straight section 241 and an inclined section 242. The first straight section 241 of the first blade 24 extends from the outer circumference to a circumference equal to the inner diameter d1 of the first end plate, and the inclined section 242 is adjacent to the first straight section 241 of the first blade 24 and extends radially inward from the circumference equal to the inner diameter d1 of the first end plate to the hub 21.

[0063] The second blade 25 (i.e., the short blade) may include a second straight section 251, a first inclined section 252, and a second inclined section 253. The second straight section 251 of the second blade 25 also extends from the outer circumference to a circumference equal to the inner diameter d1 of the first end plate. The first inclined section 252 is adjacent to the second straight section 251 of the second blade 25 and extends radially inward from the circumference equal to the inner diameter d1 of the first end plate. The diameter of the bottom end of the first inclined section 252 is denoted as d2, which is located at a circumference equal to the inner diameter side diameter D3 of the vent 1122 of the rear end cover 112, i.e., d2 = D3. Figure 6Viewed from the front view shown, the tilt angle of the first tilting segment 252 is the same as the tilt angle of the tilting segment 242 of the first blade 24. The second blade 25 also includes a second tilting segment 253 adjacent to the first tilting segment 252, and the second tilting segment 253 extends radially inward to a circumference of 1 / 2 to 2 / 3 of the length of the first blade 24.

[0064] In the axial direction, the height of the inclined section 242 of the first blade 24 gradually decreases from the outside to the inside in the radial direction, the height of the first inclined section 252 of the second blade 25 gradually decreases from the outside to the inside in the axial direction, and the height of the second inclined section 253 of the second blade 25 gradually decreases from the outside to the inside in the axial direction.

[0065] In this way, by designing long and short blades, the flow characteristics of the airflow can be fully utilized. While effectively utilizing materials and reducing blade weight, it is also ensured that a sufficient number of blades participate in the work. Specifically, when the airflow flows out from the air outlet of the rear end cover 112, part of the airflow enters the blades near the inner diameter side of the first end plate. Here, the blades have a high axial height, and the airflow is immediately subjected to work by the blades after entering the impeller. Another part of the airflow flows towards the second end plate side of the hub 21 under the action of negative pressure, and then does work along the long blades, enters the long and short blade area, and is discharged from the fan 2.

[0066] In the example shown in this disclosure, a backward-curved blade structure is used. Specifically, the semi-open impeller portion within the inner diameter d1 of the first end plate employs a standard backward-curved structure, while the closed impeller portion outside the inner diameter d1 of the first end plate uses a straight blade structure. This configuration leverages the advantages of backward-curved blades, such as high efficiency and low noise. Furthermore, using straight blades between the front and rear plates facilitates outward demolding from all sides, avoiding the drawbacks of using a single closed backward-curved impeller, such as high costs associated with mold splitting and reassembly, and poor integrity and flatness at the blade joints.

[0067] In addition, the blades have a chamfer on the outer diameter side of the first end plate that is inclined away from the housing 113, which reduces weight and also reduces the probability of collision with the fan cover 3 and damage to sharp corners.

[0068] However, those skilled in the art will envision that forward-tilted, backward-tilted, radial, and straight blades may also be used.

[0069] According to the example in this application, using plastic material for the backward-curved blades can make the impeller lighter and less expensive. Those skilled in the art can imagine that the blade material can also be metal or plastic.

[0070] In addition, such as Figure 1 and Figure 8As shown, the inertia wheel 4 is located at the end of the output shaft 12 away from the fan 2, and the outer circumferential portion 41 of the inertia wheel 4 extends beyond the front cover 111 towards the motor body 1. To facilitate airflow into the housing 113, the air inlet side of the inertia wheel 4 may be provided with a chamfer 42. With this arrangement, the inertia wheel 4 can be used to guide the airflow, directing it through the housing for auxiliary heat dissipation.

[0071] Figure 8 A schematic diagram of the airflow direction according to an embodiment of the present disclosure is shown. Figure 8 As shown, during operation, the airflow enters from the inertia wheel side under the suction of the centrifugal fan. The outer circumference 41 of the inertia wheel 4 extends axially towards the housing 113, allowing some airflow to pass through the surface of the housing 113 and enter the area between the inertia wheel 4 and the front cover 111. The airflow passing over the surface of the housing 113 enhances its heat dissipation capacity. The airflow enters the interior of the housing 113 through the front cover 111, carrying away heat from internal windings and other heat sources. The airflow flowing through the interior of the housing 113 finally flows out axially from the vent 1122 of the rear cover 112 and enters the impeller flow channel. Part of the airflow exiting from the rear cover 112 moves obliquely backward in the impeller and is discharged from the impeller. Another part of the airflow, under the negative pressure at the center of the impeller, flows towards the second end plate 23 in the middle of the impeller and is discharged obliquely backward under the action of the long blades.

[0072] The motor disclosed herein utilizes a rear end cover structure to design a fan shroud structure that guides and accumulates airflow. By partially overlapping the first end plate of the impeller with the fan shroud in the axial direction, the centrifugal fan is effectively sealed. Furthermore, the uneven thickness of the first end plate results in a longer axial length on the outer diameter side, increasing the axial length overlapped with the fan shroud and improving the sealing effect. The design of long and short blades, quasi-backward-curved blades, and the inclined design of the front and rear plates guides the airflow from the axial direction through the blades to the rearward direction, while also facilitating blade machining. While ensuring the sealing of the first end plate, the diameter of the second end plate is increased; this non-equal diameter design of the front and rear plates increases the suction force of the centrifugal fan. In addition, an inertial wheel guides the airflow across the casing surface, improving the motor's heat dissipation.

[0073] In addition, this disclosure also provides a treadmill that includes the aforementioned motor with a heat dissipation structure.

[0074] The foregoing description, with reference to preferred embodiments, details exemplary embodiments of the motor with heat dissipation structure and the treadmill including the motor proposed in this disclosure. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure.

Claims

1. A motor with a heat dissipation structure, characterized in that, include: The motor body (1) includes a motor housing (11) and an output shaft (12). A fan (2) is mounted to the output shaft (12) and the fan (2) includes a first end plate (22). The motor further includes a fan cover (3), which is located between one end of the fan (2) and the motor body (1). The fan cover (3) includes a mounting part (31) and a sealing part (32). The mounting part (31) is mounted to the motor body (1), and the sealing part (32) at least partially overlaps with the first end plate (22) of the fan (2) in the axial direction.

2. The motor according to claim 1, characterized in that, The motor housing (11) includes a housing (113) and a rear end cover (112). The rear end cover (112) is installed to the rear end of the housing, and the fan cover (3) is fixedly installed to the rear end cover (112).

3. The motor according to claim 2, characterized in that, The sealing part (32) is an annular part extending in the axial direction, and the mounting part (31) extends radially inward from the inner circumferential surface of the sealing part (32).

4. The motor according to claim 2, characterized in that, The fan cover (3) is provided with a mounting bracket (33) for abutting against the rear end face (1125) of the rear end cover (112) in the axial direction and for being fixedly connected to the rear end cover (112).

5. The motor according to claim 4, characterized in that, The mounting portion (31) has one or more openings (311) corresponding to the mounting bracket (33), the mounting bracket (33) being closer to the rear end cover (112) in the axial direction than the openings (311).

6. The motor according to claim 5, characterized in that, The mounting bracket (33) includes an axial section (331) and a radial section (332), the axial section (331) extending from the opening (311) toward the rear end cover (112) and forming part of the sealing portion (32), the radial section (332) abutting the axial section (331) and extending inward from the inner circumference of the axial section (331).

7. The motor according to claim 4, characterized in that, The rear end cover (112) includes a mounting groove (1121) that extends radially outward to the outer circumferential surface of the rear end cover (112), and the shape of the mounting groove (1121) is configured such that the mounting bracket (33) can be embedded in the mounting groove (1121) during installation.

8. The motor according to claim 6, characterized in that, The rear cover (112) includes a plurality of vents (1122) distributed in the circumferential direction, and the inner diameter of the mounting part (31) of the fan cover (3) is larger than the outer diameter of the vents (1122).

9. The motor according to claim 8, characterized in that, The fan (2) includes a hub (21), a second end plate (23) and blades, wherein the second end plate (23) extends obliquely from the hub (21) toward a circumference equal to the outer diameter of the housing (113) in a direction away from the motor body (1), and the extension direction of the second end plate (23) has a first angle relative to the radial direction.

10. The motor according to claim 9, characterized in that, The first end plate (22) is annular, and the outer diameter of the first end plate (22) is smaller than the outer diameter of the second end plate (23). The inner diameter of the first end plate (22) is equal to the middle diameter of the vent (1122) of the rear end cover (112).

11. The motor according to claim 9, characterized in that, The outer diameter of the first end plate (22) is smaller than the inner diameter of the sealing part (32) of the fan cover (3), and the sealing part (32) at least partially overlaps with the first end plate (22) in the axial direction.

12. The motor according to claim 11, characterized in that, The front side (221) of the first end plate (22) extends in the radial direction, and the rear side (222) of the first end plate (22) is inclined in a direction away from the motor body (1) and has a second included angle relative to the radial direction.

13. The motor according to claim 11, characterized in that, The overlap length between the sealing part (32) and the first end plate (22) is 1 / 2 to 2 / 3 of the radial outermost axial thickness of the first end plate (22).

14. The motor according to claim 12, characterized in that, The first included angle is greater than the second included angle.

15. The motor according to claim 9, characterized in that, An annular groove (223) is provided on the front side of the first end plate (22).

16. The motor according to claim 9, characterized in that, The fan (2) is a centrifugal fan, and the blades include a first blade (24) and a second blade (25) arranged alternately around the hub (21) in the circumferential direction. The length of the first blade (24) is greater than the length of the second blade (25).

17. The motor according to claim 16, characterized in that, The first blade (24) includes a first straight section (241) and an inclined section (242), the inclined section (242) being adjacent to the first straight section (241) of the first blade (24) and extending radially inwardly to the hub (21); and The second blade (25) includes a second straight section (251) and a first inclined section (252), the first inclined section (252) being adjacent to the second straight section (251) of the second blade (25) and extending radially inward to a circumference equal to the inner diameter of the vent (1122) of the rear end cover (112).

18. The motor according to claim 17, characterized in that, The height of the inclined section (242) of the first blade (24) in the axial direction gradually decreases from the outside to the inside in the radial direction.

19. The motor according to claim 17, characterized in that, The second blade (25) also includes a second inclined section (253) adjacent to the first inclined section (252), the second inclined section (253) extending radially inward to 1 / 2 to 2 / 3 of the circumference of the length of the first blade (24).

20. The motor according to claim 19, characterized in that, The height of the second inclined section (253) of the second blade (25) in the axial direction gradually decreases from the outside to the inside in the radial direction.

21. The motor according to claim 1, characterized in that, The motor also includes a front cover (111) and an inertia wheel (4). The front cover (111) is mounted to the front end of the housing (113). The inertia wheel (4) is located at the end of the output shaft (12) away from the fan (2). The outer circumferential portion (41) of the inertia wheel (4) extends beyond the front cover (111) toward the motor body (1).

22. The motor according to claim 21, characterized in that, The air intake side of the inertial wheel (4) is provided with a chamfer (42).

23. A treadmill, characterized in that, Includes the motor according to any one of the preceding claims.

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