Motor with heat dissipation structure and treadmill comprising motor

Abstract

The invention provides a motor with a heat dissipation structure, and the motor comprises a motor main body which comprises a motor housing and an output shaft; a fan mounted to the output shaft; the motor further comprises a fan cover, the fan cover is located between the fan and one end of the motor body, the fan cover comprises an installation part and a sealing part, the installation part is installed on the motor body, and at least one part of the sealing part is located outside the centrifugal fan in the radial direction and partially coincides with the fan in the axial direction. The invention also provides a treadmill comprising the motor.

Description

Technical Field

[0001] The present disclosure relates to an electric motor having a heat dissipation structure and a treadmill including the electric motor. Background Art

[0002] Currently, for devices such as treadmills, due to narrow installation space and large input power requirements, slender electric motor designs are generally adopted, resulting in slender and narrow internal air ducts, increasing the difficulty of heat dissipation. Traditional heat dissipation solutions mostly use external centrifugal fans, but there are problems of insufficient sealing or complex structures. For example, directly hanging a fan outside leads to low air suction efficiency, or using a complex sealing structure drives up costs, making it difficult to balance efficient heat dissipation and economy. In addition, the lack of targeted design in the cooperation between the centrifugal fan and the electric motor results in uneven heat dissipation, and it is also difficult to achieve efficient thermal management in a limited space. Therefore, there is an urgent need for a simple, reliable, and efficient heat dissipation solution. Summary of the Invention

[0003] In view of the above problems, according to a first aspect of the present disclosure, there is provided an electric motor having a heat dissipation structure, including: a motor main body including a motor housing and an output shaft; a fan mounted to the output shaft; wherein, the electric motor further includes a fan cover located between the fan and one end of the motor main body, the fan cover including a mounting portion and a sealing portion, the mounting portion being mounted to the motor main body, and at least a part of the sealing portion being located outside the fan in the radial direction and overlapping with the fan in the axial direction.

[0004] By designing a fan cover at one end of the motor main body and enabling the fan cover to cooperate with the fan structure, it is possible to guide all the airflow inside the motor to be discharged through the fan, prevent the airflow flowing out of the motor main body from leaking out of the motor before reaching the fan inlet, thereby effectively increasing the suction force and improving the heat dissipation efficiency. This structure is simple, has a low manufacturing cost, and is reliable and efficient in heat dissipation at the same time.

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

[0006] According to one embodiment, the motor housing includes a casing and a rear end cover, the rear end cover being mounted to the rear end of the casing, 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 axially abutting against the rear end face of the rear end cover and fixedly connecting with the rear end cover.

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

[0010] According to one embodiment, the mounting bracket includes an axial section and a radial section. The axial section extends from the opening toward the rear end cover and forms part of the sealing portion. The radial section is adjacent to the axial section and extends inward from the inner circumferential surface of the axial section.

[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 set 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 ventilation openings distributed in the circumferential direction, and the inner diameter of the mounting portion of the fan cover is greater than the outer diameter side diameter of the ventilation openings.

[0013] According to one embodiment, the fan includes a hub, a front plate, a rear plate, and blades. Among them, the rear plate extends obliquely from the hub in a direction away from the motor body to a circumference equal to the outer diameter of the casing, and the extending direction of the rear plate has a first included angle with respect to the radial direction.

[0014] According to one embodiment, the front plate is annular, and the outer diameter of the front plate is smaller than the outer diameter of the rear plate. The inner diameter of the front plate is equal to the middle diameter of the ventilation openings of the rear end cover.

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

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

[0017] According to one embodiment, the overlapping length of the sealing portion and the front plate is 1 / 2 to 2 / 3 of the axial thickness of the outermost radial side of the front 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 front plate.

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

[0021] According to one embodiment, the first blade includes a straight section and an inclined section. The inclined section is adjacent to the straight section of the first blade and extends radially inwardly and obliquely to the hub; and the second blade includes a straight section and a first inclined section. The first inclined section is adjacent to the straight section of the second blade and extends radially inwardly to a circumference having a diameter equal to the inner diameter side 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 section adjacent to the first inclined section. The second inclined section extends radially inwardly to a circumference that is 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 is mounted to the front end of the housing. The inertia wheel is located at an end of the output shaft away from the fan, and an outer circumferential portion of the inertia wheel extends in the direction of the motor body to exceed the front end cover.

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

[0027] According to a second aspect of the present disclosure, a treadmill is provided, including the motor according to any one of the foregoing. Brief Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments of the present disclosure will be briefly introduced below. Among them, the drawings are only used to show some embodiments of the present disclosure, rather than limiting all embodiments of the present disclosure thereto.

[0029] Figure 1 Shows an overall cross-sectional view of a motor according to an embodiment of the present disclosure;

[0030] Figure 2 Shows an exploded view of a motor according to an embodiment of the present disclosure;

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

[0032] Figure 4 Shows a front view of a rear end cover according to an embodiment of the present disclosure;

[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, where the front 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 air flow direction according to an embodiment of the present disclosure is shown. Detailed Description of the Embodiment

[0037] In order to make the objectives, technical solutions, and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present disclosure. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0038] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art within the field to which the present disclosure pertains. The terms "first", "second", and similar terms used in the specification and claims of the present patent application do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms "comprising", "including", or similar terms mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. The terms "connected" or "coupled" or similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0039] The present disclosure will be described in detail below by describing exemplary embodiments.

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

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

[0042] By designing a fan cover at one end of the electric machine main body and making the fan cover cooperate with the fan structure, it is possible to guide all the air flow inside the electric machine to be discharged through the fan, prevent the air flow flowing out of the electric machine main body from leaking out of the electric machine before reaching the fan inlet, thereby effectively increasing the suction force and improving the heat dissipation efficiency. This structure is simple, with low manufacturing cost, and at the same time, the heat dissipation is reliable and efficient.

[0043] The electric machine housing 11 according to the present disclosure may further include a casing 113 and a rear end cover 112. The rear end cover 112 is mounted to the rear end of the casing. The fan cover 3 is fixedly mounted between the rear end cover 112 and the fan. A ventilation opening for heat dissipation is provided on the front end face of the casing. The casing of the electric machine housing in the drawings according to the present disclosure is an integral part, but those skilled in the art can understand that the casing can also be formed by buckling two upper and lower parts, and the front end cover and the rear end cover can be omitted. Correspondingly, the ventilation openings for heat dissipation can be provided on the front and rear end faces of the casing, and the fan cover can be mounted to the front end or the rear end of the casing. Those skilled in the art can understand that the heat dissipation structure of the present disclosure is not limited to the specific structure of the electric machine housing, and the electric machine housing can have various implementation manners.

[0044] The electric machine housing 11 according to the present disclosure may further include a front end cover 111, a rear end cover 112 and a casing 113 mounted between the front end cover 111 and the rear end cover 112. The front end cover 111, the rear end cover 112 and the casing 113 are buckled together. The fan cover 3 is fixed to the casing 113 with the front end cover 111 and the rear end cover 112 through long tie rods 13. The casing 113, permanent magnets, etc. of the electric machine constitute the stator part of the electric machine. The front end cover 111, the rear end cover 112 and the bearings thereon provide support for the rotor system. The rotor core and the windings, commutator, etc. thereon are strung on the output shaft 12 (i.e., the rotor shaft) and provide support for the whole machine rotor system through the bearings on both side end covers. The fan 2 is mounted to the output shaft 12. For example, the fan 2 can be mounted to the rear end of the output shaft 12 extending from the rear end cover 112 and rotates along with the output shaft 12 of the electric machine. An inertia wheel 4 can be mounted to the front end of the output shaft 12 extending from the front end cover 111 to improve the system stability during the operation of the electric machine.

[0045] As Figure 1and Figure 2 As shown, the fan cover 3 is located between the fan 2 and one end of the motor body 1. For example, the fan cover 3 can be fixedly installed on the rear end cover 112 of the motor housing 11. Ventilation openings 1122 are provided on both the front end cover 111 and the rear end cover 112, and the air suction holes of the fan 2 are arranged to face the ventilation openings 1122 of the rear end cover 112. When the motor operates, under the action of the fan 2, the air flow enters the channel between the inertial 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 suction holes of the fan 2 through the ventilation opening 1122 of the rear end cover 112. In this article, the fan 2 can be a centrifugal fan, and those skilled in the art can understand that the fan 2 can also be any other suitable type of fan device.

[0046] In this article, "front" and "rear" are only used to represent the relative positional relationship between various components in the axial direction of the motor. For example, along the air flow direction is backward, and against the air flow direction is forward, rather than a restrictive effect.

[0047] Figure 3 Shows a perspective view of the fan cover 3 and the rear end cover 112 according to an embodiment of the present disclosure. As Figure 3 shown, according to an embodiment of the present application, the fan cover 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 the mounting and sealing surface, and this mounting portion 31 is used to be mounted to the motor body 1. At least a part of the sealing portion 32 is located outside the centrifugal fan in the radial direction and coincides with the fan 2 in the axial direction (as Figure 1 shown), so that the sealing portion 32 can cooperate with the fan 2 to reduce the entry of external air flow into the fan cover 3 through this gap.

[0048] Further referring to Figure 3 , the fan cover 3 is provided with a mounting bracket 33 for axially abutting against the rear end face 1125 of the rear end cover 112 and fixedly connecting with the rear end cover 112. The mounting portion 31 has one or more openings 311 corresponding to the mounting bracket 33, and the mounting bracket 33 is closer to the rear end cover 112 than the openings 311 in the axial direction. The mounting bracket 33 includes an axial section 331 and a radial section 332. The axial section 331 extends from the opening 311 towards the rear end cover 112 and forms a part of the annular sealing portion 32, and the radial section 332 is adjacent to the axial section 331 and extends inward from the inner circumferential surface of the axial section 331, thus forming an L-shaped mounting bracket 33, and through holes are provided in the radial section 332 for the long pull rod screw 13 to pass through. In addition, the mounting portion 31 can also be provided with two threaded through holes 1123 for the auxiliary screw 34 to pass through, for further fixedly connecting to the rear end cover 112.

[0049] Figure 4 shows a front view of the rear end cover 112 according to an embodiment of the present disclosure. As Figure 3 and Figure 4 shown, the rear end cover 112 includes a mounting groove 1121 for mounting a nut 14 that cooperates with the long pull rod screw 13. A screw hole 1124 is provided in the mounting groove 1121 for the long pull rod screw to pass through. The mounting groove 1121 axially extends forward from the rear end face 1125 for a distance equal to the axial dimension of the axial section 331 of the mounting bracket 33. The mounting groove 1121 radially extends outward to the outer circumferential surface of the rear end cover 112, and the shape of the mounting groove 1121 is set such that the mounting bracket 33 can be embedded in the mounting groove 1121 during installation. In Figure 3 and Figure 4 the illustrated example, the number of openings 311 is two, and they are symmetrically arranged in the circumferential direction of the mounting portion 31. Correspondingly, the number of mounting grooves 1121 is also two and is also symmetrically arranged. However, those skilled in the art can envision that the number of openings 311 and mounting grooves 1121 can also be more than two, such as four or six, and the present 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 portion 31 also fits against the end face of the rear end cover 112. At the same time, 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 installation method of the long pull rod screw 13, the fan cover 3, the front end cover 111, the rear end cover 112, the housing 113, etc. can be serially installed together, thereby positioning the fan cover 3 well and facilitating the overall installation of the motor. By providing two additional auxiliary screws 34 to connect the mounting portion 31 and the rear end cover 112, it ensures that the mounting sealing surface of the fan cover 3 better fits against the rear end face 1125 of the rear end cover 112 and increases the installation firmness.

[0051] As Figure 4 shown, the rear end cover 112 includes a plurality of ventilation openings 1122 distributed in the circumferential direction. The positions of the ventilation openings 1122 avoid the mounting groove 1121, and their shapes can be annular sectors or irregular shapes to maximize the ventilation area as much as possible. As Figure 4As shown, the outer diameter side diameter of the vent 1122 of the rear end cover 112 is denoted as D1, the inner diameter side 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, that is, D2 = (D1 + D3) / 2. The inner diameter of the mounting portion 31 of the fan cover 3 is larger than the outer diameter side diameter D1 of the vent 1122, so that the air flow can smoothly pass through the vent 1122 of the rear end cover 112.

[0052] The setting of the centrifugal fan will be described below with reference to the accompanying drawings. 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, in which the front 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] As Figure 5 shown, the fan 2 includes a hub 21, a front plate 22, a rear plate 23, and blades. The hub 21 includes a shaft hole that mates with the rear end of the motor output shaft 12. The front plate 22 is annular, and an air suction port 224 is formed in the middle. The rear plate 23 is disc-shaped. In the axial direction, the front end and the rear end of the blade are respectively fixedly connected to the front plate 22 and the rear plate 23.

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

[0055] As Figure 7 shown, the front side surface 221 of the front plate 22 extends in the radial direction, and the rear side surface 222 of the front plate 22 inclines in a direction away from the motor body 1 and has a second included angle β with respect to the radial direction. That is to say, the front side of the front plate 22 is a planar structure, and the rear side close to the blade side is an inclined structure. In this way, the front plate 22 is thinner on the inner diameter side and thicker on the outer circumferential side. The thicker outer circumferential side increases the overlapping area with the sealing portion 32 of the fan cover 3, which is convenient for sealing when the fan works.

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

[0057] As Figure 7 shown, the inner diameter d1 of the front plate 22 (i.e., the diameter of the air suction port 224 of the front plate 22) can be equal to the middle diameter D2 of the ventilation port 1122 of the rear end cover 112, that is, d1 = D2. In this way, it not only ensures a sufficient blade - enclosed area but also facilitates the smooth entry of the axial airflow flowing out from the rear end cover 112 into the blade passage of the centrifugal fan.

[0058] The outer diameter of the front plate 22 can also be less than the inner diameter of the sealing portion 32 of the fan cover 3, and the sealing portion 32 at least partially coincides with the front plate 22 in the axial direction. Specifically, the outer peripheral surface of the front plate 22 faces the inner circumferential surface of the sealing portion 32 of the fan cover 3. The front plate 22 extends deep into the interior of the fan cover 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 peripheral surface of the front plate 22. Thus, it not only ensures a sufficient overlapping area for sealing but also reserves space for the axial movement of the rotor system, and there is a certain gap between the two in the radial direction for relative rotation.

[0059] The outer diameter of the front plate 22 of the fan 2 can be less than the outer diameter of the rear plate 23, and the rear plate 23 extends to the circumference where the outer diameter of the housing 113 is equal. The outermost end of the blade extends to be flush with the outer diameter of the rear plate 23. Through the non - equal outer diameter design of the front and rear plates, the outer diameter of the impeller can be increased as much as possible without exceeding the outer diameter of the housing 113, thereby having a greater suction force. At the same time, it takes into account the axial sealing on the front - plate side and the outer diameter of the whole machine does not exceed the housing 113 at the rear side.

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

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

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

[0063] The second blade 25 (i.e., the short blade) may include a straight section 251, a first inclined section 252, and a second inclined section 253. The straight section 251 of the second blade 25 also extends from the outer circumference to the circumference equal to the inner diameter d1 of the front plate. The first inclined section 252 is adjacent to the straight section 251 of the second blade 25 and extends radially inwardly from the circumference equal to the inner diameter d1 of the front plate. The diameter of the bottom end of the first inclined section 252 is denoted as d2, and this diameter d2 is located at the circumference equal to the inner diameter side diameter D3 of the vent 1122 of the rear end cover 112, i.e., d2 = D3. Figure 6 Viewed from the perspective of the front view shown, the inclination angle of the first inclined section 252 of the second blade 25 is the same as the inclination angle of the inclined section 242 of the first blade 24. The second blade 25 further includes a second inclined section 253 adjacent to the first inclined section 252, and the second inclined section 253 extends radially inwardly to the circumference at 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 in the axial direction gradually decreases from outside to inside in the radial direction, the height of the first inclined section 252 of the second blade 25 in the axial direction gradually decreases from outside to inside in the radial direction, and the height of the second inclined section 253 of the second blade 25 in the axial direction gradually decreases from outside to inside in the radial direction.

[0065] In this way, through the design of long and short blades, the flow characteristics of the air flow can be fully utilized, while effectively using materials and reducing the weight of the blades, and ensuring that enough blades participate in the work. Specifically, when the air flow flows out from the air outlet of the rear end cover 112, part of the air flow enters the blade near the inner diameter side of the front plate. Here, the axial height of the blade is high, and the air flow is immediately subjected to the work of the blade after entering the impeller. Another part of the air flow flows towards the rear plate side of the hub 21 under the action of negative pressure, and then enters the long and short blade area along the work of the long blade and is discharged from the fan 2.

[0066] In the example shown in the present disclosure, a blade with a quasi-backward-inclined structure is used. That is, in the semi-open impeller part within the inner diameter d1 of the front plate, a standard backward-inclined structure is adopted, and in the closed impeller part outside the inner diameter d1 of the front plate, a straight blade structure is adopted. Through this setting, the advantages of high efficiency and low noise of the backward-inclined blade can be utilized, and at the same time, the straight blade type is adopted between the front and rear plates, which is convenient for demolding and processing outwardly on all sides, avoiding the disadvantages of high cost of mold splitting and mold closing and poor integrity and flatness at the blade connection when using a closed backward-inclined impeller as a whole.

[0067] In addition, the blade has a chamfer on the outer diameter side of the front plate that is inclined away from the housing 113, which reduces weight and reduces the probability of collision with the fan cover 3 and damage by sharp corners.

[0068] However, those skilled in the art can imagine that forward-inclined, backward-inclined, radial and straight blades may also be used.

[0069] According to the example of the present application, the backward-inclined blades are made of plastic material to make the impeller lighter and lower the cost. Those skilled in the art can imagine that the material of the blades can also be metal or plastic.

[0070] In addition, if Figure 1 and Figure 8 As 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 toward the motor body 1 to exceed the front end cover 111. In order to facilitate the airflow to enter the interior of the housing 113, a chamfer 42 may be provided on the air inlet side of the inertia wheel 4. Through such a configuration, the inertia wheel 4 can be reasonably utilized to guide the airflow, so that the airflow is directed through the fuselage to assist in heat dissipation.

[0071] Figure 8 FIG. 1 is a schematic diagram showing the airflow direction according to an embodiment of the present disclosure. Figure 8 As shown, when working, the airflow enters from the inertia wheel side under the suction of the centrifugal fan, and the outer circumference 41 of the inertia wheel 4 extends axially toward the housing 113, so that part of the airflow passes through the surface side of the housing 113 and enters the area between the inertia wheel 4 and the front cover 111. The airflow passes through the surface of the housing 113, so that the heat dissipation capacity of the housing 113 is enhanced. The airflow enters the inside of the housing 113 through the front cover 111, taking away the heat of the internal winding and other heat sources. The airflow flowing through the inside 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 flowing out of the rear cover 112 enters and exits the impeller and moves obliquely backward and is discharged from the impeller, and another part of the airflow flows to the rear plate 23 in the middle of the impeller under the negative pressure at the center of the impeller and is discharged obliquely backward under the action of the long blades.

[0072] The motor provided by the present disclosure utilizes the rear end cover structure to design the fan cover structure to guide the accumulated airflow, and the centrifugal fan is effectively sealed by partially overlapping the impeller front plate and the fan cover in the axial direction, and the uneven thickness setting of the front plate makes the front plate have a long axial length on the outer diameter side, which increases the axial length overlapping with the fan cover, and the sealing effect is better; through the long and short blades and the backward inclined blade design and the front and rear plate tilting design, the airflow is guided to be discharged from the axial direction through the blades to the oblique rear, and the processing of the blades is convenient; on the premise of ensuring the sealing of the fan front plate, the diameter of the rear half plate is increased, and this non-equal diameter design of the front and rear plates increases the suction of the centrifugal fan. In addition, the inertia wheel is used to guide the airflow to flow through the surface of the casing to improve the heat dissipation effect of the motor.

[0073] In addition, the present disclosure also provides a treadmill, which includes the aforementioned motor having a heat dissipation structure.

[0074] The exemplary embodiments of the motor with a heat dissipation structure and the treadmill including the motor proposed by the present disclosure have been described in detail above with reference to the preferred embodiments. However, those skilled in the art can understand that, without departing from the concept of the present disclosure, various modifications and alterations can be made to the above specific embodiments, and various combinations of the technical features and structures proposed by the present disclosure can be made without exceeding the protection scope of the present disclosure.

Claims

1. A motor with a heat dissipation structure, comprising: A motor body (1) comprising a motor housing (11) and an output shaft (12); A fan (2), the fan (2) being mounted on the output shaft (12); The motor further comprises a fan cover (3), wherein the fan cover (3) is located between the fan (2) and one end of the motor body (1), and the fan cover (3) comprises a mounting portion (31) and a sealing portion (32), wherein the mounting portion (31) is mounted to the motor body (1), and at least a portion of the sealing portion (32) is located outside the fan (2) in a radial direction and partially overlaps with the fan (2) in an axial direction.

2. The motor according to claim 1, wherein: The motor housing (11) comprises a casing (113) and a rear end cover (112); the rear end cover (112) is mounted to the rear end of the casing; and the fan cover (3) is fixedly mounted to the rear end cover (112).

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

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

5. The motor according to claim 4, wherein: The mounting portion (31) has one or more openings (311) corresponding to the mounting frame (33), and the mounting frame (33) is closer to the rear end cover (112) than the openings (311) in the axial direction.

6. The motor according to claim 5, wherein: The mounting frame (33) comprises an axial section (331) and a radial section (332), wherein the axial section (331) extends from the opening (311) toward the rear end cover (112) and forms a part of the sealing portion (32), and the radial section (332) is adjacent to the axial section (331) and extends inwardly from the inner circumferential surface of the axial section (331).

7. The motor according to claim 2, wherein: The rear end cover (112) comprises a mounting groove (1121), the mounting groove (1121) extending radially outward to the outer circumferential surface of the rear end cover (112), and the shape of the mounting groove (1121) is arranged so that the mounting frame (33) can be embedded in the mounting groove (1121) during installation.

8. The motor according to claim 6, wherein: The rear end cover (112) comprises a plurality of ventilation openings (1122) distributed in a circumferential direction, and the inner diameter of the mounting portion (31) of the fan cover (3) is larger than the outer diameter of the ventilation openings (1122).

9. The electric machine according to claim 8, wherein: The fan (2) comprises a hub (21), a front plate (22), a rear plate (23) and blades, wherein the rear plate (23) extends obliquely from the hub (21) in a direction away from the motor body (1) to a circumference equal to the outer diameter of the casing (113), and the extension direction of the rear plate (23) has a first angle relative to the radial direction.

10. The electric machine according to claim 9, wherein: The front plate (22) is annular, and the outer diameter of the front plate (22) is smaller than the outer diameter of the rear plate (23), and the inner diameter of the front plate (22) is equal to the middle diameter of the vent (1122) of the rear end cover (112).

11. The electric machine according to claim 9, wherein: The outer diameter of the front plate (22) is smaller than the inner diameter of the sealing portion (32) of the fan cover (3), and the sealing portion (32) at least partially overlaps with the front plate (22) in the axial direction.

12. The electric machine according to claim 11, wherein: The front side surface (221) of the front plate (22) extends in a radial direction, and the rear side surface (222) of the front plate (22) is inclined in a direction away from the motor body (1) and has a second angle relative to the radial direction.

13. The electric machine according to claim 11, wherein: The overlapping length of the sealing portion (32) and the front plate (22) is 1 / 2 to 2 / 3 of the radially outermost axial thickness of the front plate (22).

14. The electric machine according to claim 12, wherein: The first angle is greater than the second angle.

15. The electric machine according to claim 9, wherein: An annular groove (223) is provided on the front side of the front plate (22).

16. The electric machine according to claim 9, wherein: The fan (2) is a centrifugal fan, the blades comprising first blades (24) and second blades (25) alternately arranged in a circumferential direction around a hub (21), and the length of the first blades (24) is greater than the length of the second blades (25).

17. The electric machine according to claim 16, wherein: The first blade (24) comprises a straight section (241) and an inclined section (242), wherein the inclined section (242) is adjacent to the straight section (241) of the first blade (24) and extends radially inwardly and obliquely to the hub (21); and The second blade (25) comprises a straight section (251) and a first inclined section (252), wherein the first inclined section (252) is adjacent to the straight section (251) of the second blade (25) and extends radially inward to a circumference having a diameter equal to the inner diameter side of the ventilation opening (1122) of the rear end cover (112).

18. The electric machine according to claim 17, wherein: 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 electric machine according to claim 17, wherein: The second blade (25) further includes a second inclined section (253) adjacent to the first inclined section (252), and the second inclined section (253) extends radially inward to a circumference of 1 / 2 to 2 / 3 of the length of the first blade (24).

20. The electric machine according to claim 19, wherein 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 along the radial direction.

21. The electric machine according to claim 1, wherein The motor further comprises a front end cover (111) and an inertia wheel (4), wherein the front end 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), and an outer circumferential portion (41) of the inertia wheel (4) extends in the direction of the motor body (1) beyond the front end cover (111).

22. The electric machine according to claim 21, wherein The air inlet side of the inertia wheel (4) is provided with a chamfer (42).

23. A treadmill comprising a motor according to any preceding claim.

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