External rotor motor and fitness equipment

Abstract

The utility model discloses an external rotor motor and fitness equipment, and relates to the technical field of motors, the external rotor motor comprises a stator and a roller rotor rotatably sleeved on the stator, the end portion of the roller rotor is provided with an end cover, one side of the end cover deviating from the roller rotor is uniformly provided with a plurality of first fan blades around the periphery of the end cover, and the first fan blades are provided with second fan blades. A reinforcing rib is arranged between any two adjacent first fan blades in a protruding mode, any two adjacent first fan blades and the reinforcing ribs form a counterweight groove at intervals, and through reasonable layout of the first fan blades, the reinforcing ribs and the counterweight groove, the outer rotor motor has better heat dissipation performance and stability, the structure of the outer rotor motor can be more compact, and the service life of the outer rotor motor is prolonged. And the miniaturization and light weight design is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to an outer rotor motor and fitness equipment. Background Art

[0002] An external rotor motor is one of many types of motors in which the rotor rotates as the output of the motor and the stator is fixed.

[0003] During the manufacturing process of external rotor motors, machining errors or uncertainties in manual operations can cause uneven mass distribution of motor components, making it difficult to ensure good stability during operation of the motor, leading to a series of situations such as noise, vibration, bearing damage, and even equipment damage.

[0004] In addition, with the continuous development of motor technology, the requirements for heat dissipation performance of external rotor motors are becoming higher and higher, and ordinary motor heat dissipation structures have met the requirements in the market.

[0005] To solve the above problems, current outer rotor motors will add heat dissipation structures and counterweight structures on the rotor of the motor. However, after further adding the heat dissipation structure and the counterweight structure, the structure of the outer rotor motor will become very bloated and cumbersome, and the structural layout cannot be compact and reasonable, making it difficult to use in equipment with relatively narrow installation space. Its performance cannot be brought into play at its due level due to various physical structural limitations. Utility Model Content

[0006] The purpose of the embodiments of the utility model is to provide an outer rotor motor and fitness equipment to solve the problem of low compactness of the outer rotor motor structure.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] In a first aspect, an outer rotor motor is provided, comprising:

[0009] stator;

[0010] A drum rotor is rotatably mounted on the stator;

[0011] A motor shaft connected to the stator and extending in the axial direction;

[0012] An end cover is mounted on the end of the drum rotor, and the motor shaft passes through the end cover and out of the drum rotor;

[0013] A plurality of first blades are evenly distributed around the outer periphery of the end cover on one side away from the drum rotor, and reinforcing ribs are protruding between any two adjacent first blades, and a counterweight groove is formed between any two adjacent first blades and the reinforcing ribs.

[0014] Through the reasonable arrangement of the first fan blade, reinforcing ribs and counterweight grooves, the end cover structure layout is made more reasonable, which is conducive to the lightweight and miniaturized design of the outer rotor motor while ensuring its superior heat dissipation performance and stability.

[0015] As an optional implementation, the end cover is evenly distributed with a plurality of second blades around its circumference, and a ventilation hole connecting the inside and the outside of the drum rotor is formed between any two adjacent second blades;

[0016] Each of the first fan blades is located at an end of each of the second fan blades away from the motor shaft, and the number of the first fan blades is greater than the number of the second fan blades.

[0017] The second fan blade cooperates with the first fan blade to improve the heat dissipation performance of the outer rotor motor and improve the heat exchange efficiency inside the drum rotor.

[0018] As an optional embodiment, the end cover comprises:

[0019] The inner ring of the support is provided with a through shaft hole, the motor shaft passes through the shaft hole and out of the outside of the end cover, and the inner ring of the support is evenly distributed with a plurality of second blades around its outer periphery;

[0020] The supporting outer ring is arranged around the supporting inner ring at intervals, the opposite ends of the second fan blades are respectively connected to the supporting inner ring and the supporting outer ring, and each of the first fan blades and the reinforcing ribs are arranged around the supporting outer ring.

[0021] The second fan blade is connected by a supporting inner ring and a supporting outer ring, which improves the stability of the second fan blade during operation and also meets the structural strength requirements of the end cover.

[0022] As an optional implementation, the supporting outer ring includes:

[0023] A first side wall is spaced around the supporting inner ring, and opposite ends of the second blade are respectively connected to the supporting inner ring and the inner wall surface of the first side wall;

[0024] The second side wall is spaced around the first side wall, and the first blade and the reinforcing rib have opposite ends connected to the outer wall surface of the first side wall and the inner wall surface of the second side wall respectively.

[0025] The first fan blade is connected through the first side wall and the second side wall, which improves the stability of the first fan blade during operation and also meets the structural strength requirements of the end cover.

[0026] As an optional implementation, the first side wall protrudes from the second side wall along the axial direction, and the end of the first blade is inclined from the inside to the outside in a direction close to the second side wall;

[0027] The end of the reinforcing rib is arranged flush with the end of the second side wall.

[0028] Improve the rectifying effect of the first fan blade.

[0029] As an optional embodiment, the end covers are provided at both opposite ends of the drum rotor, an air inlet cover is provided at the first end of the drum rotor, and an air outlet cover is provided at the second end of the drum rotor;

[0030] The inclination direction of the second fan blade of the air inlet cover body and the inclination direction of the second fan blade of the air outlet cover body are consistent.

[0031] Improve the heat dissipation performance of the outer rotor motor and its internal heat exchange efficiency.

[0032] As an optional implementation, the number of the second fan blades of the air inlet cover body is greater than the number of the second fan blades of the air outlet cover body.

[0033] Improve the heat dissipation performance of outer rotor motors.

[0034] As an optional implementation, the number of the second fan blades of the air inlet cover body is 7, and the number of the second fan blades of the air outlet cover body is 5.

[0035] On the basis of ensuring the structural strength of the end cover, the number of fan blades is reduced as much as possible, which is conducive to the miniaturization design of the outer rotor motor. At the same time, setting the number of fan blades to an odd number can also avoid the vibration of the outer rotor motor to a certain extent.

[0036] As an optional implementation, the number of the first fan blades of the air inlet cover body is consistent with the number of the first fan blades of the air outlet cover body, both of which are 12 blades.

[0037] Improve the rectification effect during the operation of the end cover.

[0038] In a second aspect, a fitness device is provided, comprising:

[0039] The device body is provided with a movable moving part;

[0040] The outer rotor motor as described in the first aspect is installed on the equipment body through the motor shaft, and at least one of the end covers is connected to an output part, and the drum rotor is driven to the moving part through the output part.

[0041] By applying the outer rotor motor to the fitness equipment, the fitness equipment can maintain a stable operating state and improve the user experience.

[0042] The beneficial effects of the utility model are as follows: the outer rotor motor increases the contact surface between the end cover and the external air by evenly distributing the first blades and the reinforcing ribs on the end cover installed on the drum rotor, and the heat inside the motor can be more evenly distributed to all parts of the end cover. At the same time, the first blades and the reinforcing ribs also play a role in heat exchange with the external air, so that the outer rotor motor has better heat dissipation performance;

[0043] Furthermore, during the rotation of the drum rotor, the first fan blades distributed on the outer periphery of the end cover can better cut the air, making the air supply more natural and gentle, reducing the noise and vibration of the motor, while also improving the heat exchange efficiency of the original heat dissipation structure of the motor, so that the heat dissipation performance of the outer rotor motor is further improved;

[0044] Furthermore, the reinforcing ribs not only improve the heat dissipation performance of the end cover, but also enhance the structural strength of the end cover, reduce the vibration generated by the end cover and even the motor as a whole, and make the motor run more smoothly;

[0045] Furthermore, a counterweight groove is formed between the first blade and the reinforcing rib, making the end cover structure more compact. The first blade and the reinforcing rib are alternately arranged on the end cover, which makes the overall layout of the outer rotor motor more reasonable, which is conducive to the miniaturization and lightweight design of the outer rotor motor. At the same time, the counterweight groove can also provide corresponding accommodation space for counterweight structures such as counterweight blocks and balancing mud, thereby meeting the later balance debugging of the outer rotor motor and further compensating and improving the balance of the equipment during operation.

[0046] Moreover, on the basis of setting the first fan blade and the reinforcing ribs, not only does the end cover structure not be destroyed to reduce the structural strength of the outer rotor motor, but the strength of the end cover is further enhanced by the reinforcing ribs, thereby making the operation process of the outer rotor motor more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The utility model is further described in detail below based on the drawings and embodiments.

[0048] Figure 1 This is a schematic diagram of the structure of the outer rotor motor according to an embodiment of the utility model;

[0049] Figure 2 This is a cross-sectional view of the outer rotor motor according to an embodiment of the utility model;

[0050] Figure 3 This is a schematic diagram of the drum rotor structure of the embodiment of the utility model;

[0051] Figure 4This is a schematic diagram of the structure of the air inlet end cover according to an embodiment of the utility model;

[0052] Figure 5 This is a schematic diagram of the air outlet cover structure described in an embodiment of the utility model.

[0053] In the figure: 10, stator; 11, motor shaft; 20, drum rotor; 21, accommodating space; 22, mounting hole; 23, permanent magnet; 30, end cover; 31, first fan blade; 32, reinforcing rib; 33, counterweight groove; 34, second fan blade; 35, ventilation hole; 36, support inner ring; 361, shaft hole; 37, support outer ring; 371, first side wall; 372, second side wall; 38, air inlet cover; 39, air outlet cover; 40, output part. DETAILED DESCRIPTION

[0054] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model are further described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0055] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0057] An external rotor motor is a type of motor in which the rotor rotates as the output end of the motor and the stator is fixed.

[0058] Compared with inner rotor motors, outer rotor motors have greater rotational inertia and higher stability. In addition, the rotor of the outer rotor motor can also serve as a heat dissipation component, allowing the motor to dissipate heat faster. Therefore, the outer rotor motor also has higher heat dissipation performance.

[0059] From the background technology, it can be seen that in the manufacturing process of the outer rotor motor, processing errors or uncertainties in manual operations will cause uneven mass distribution of motor components, making it difficult to ensure the dynamic balance of the motor during operation, leading to a series of situations such as noise, vibration, bearing damage, and even equipment damage.

[0060] In addition, with the continuous development of motor technology, the requirements for heat dissipation performance of external rotor motors are becoming higher and higher. Therefore, ordinary motor heat dissipation structures have met the requirements in the market.

[0061] To solve the above problems, the current outer rotor motor will add a heat dissipation structure and a counterweight structure on the rotor of the motor. For example, heat sinks, fan blades, etc. are added to the motor rotor, and grooves for accommodating counterweights or balancing mud are opened on the motor rotor. However, after further adding the heat dissipation structure and the counterweight structure, the structure of the outer rotor motor will become very bloated and cumbersome. The newly added heat dissipation structure and the counterweight structure are independent of each other, making the motor structure layout compact and reasonable, making it difficult to use in equipment with relatively narrow installation space, and its performance cannot be brought into play due to various physical structural limitations.

[0062] Therefore, the present embodiment provides an outer rotor motor, which, on the basis of adding a heat dissipation structure and a counterweight structure, rationally arranges the heat dissipation structure and the counterweight structure so that the outer rotor motor forms a counterweight structure at the same time as the heat dissipation structure is set, thereby solving the problem that the outer rotor motor has a low degree of compactness and is difficult to meet the current requirements of heat dissipation and performance of the motor.

[0063] Please refer to the attached Figure 1-Figure 3 The outer rotor motor includes a stator 10 and a drum rotor 20 that can rotate relative to the stator 10.

[0064] Among them, the stator 10 is connected to the motor shaft 11 extending along its axial direction, and the motor shaft 11 is fixedly connected to the stator 10 to support and fix the stator 10 when the outer rotor motor is in use. In addition, the motor shaft 11 can also be used to pass the wires of the outer rotor motor. The wires connected to the stator 10 can be inserted into it from one end of the motor shaft 11 and extend along the direction in which the motor shaft 11 extends, and finally pass out from the end of the motor shaft 11 away from the stator 10, and are used to connect to the control unit and power supply of the external device.

[0065] The drum rotor 20 is a cylindrical structure, and a through accommodating space 21 is formed inside. It can be understood that the accommodating space 21 passes through the opposite ends of the accommodating space 21 along the axial direction of the drum rotor 20, so that mounting holes 22 are opened at both ends of the drum rotor 20. The rotor is assembled to the accommodating space 21 through one of the mounting holes 22, and there is a certain gap between the rotor and the inner cylinder wall of the drum rotor 20, that is, the drum rotor 20 can be rotatably mounted on the stator 10 to ensure that the drum rotor 20 as the motor rotor can normally rotate relative to the stator 10.

[0066] In order to ensure that the stator 10 is in a relatively fixed state during the operation of the outer rotor motor, the motor shaft 11 extends to the outside of the drum rotor 20 through the mounting hole 22 to provide an external limiting structure for fixing the stator 10 in a fixed position.

[0067] It should be understood that the interface shape of the inner wall of the drum rotor 20 is circular to ensure that the gap size between the drum rotor 20 and the stator 10 is uniform, so that the rotation of the outer rotor motor is more stable.

[0068] As for the cross-sectional shape of the outer wall of the drum rotor 20, the present invention does not have any specific and strict limitation. The outer contour of the drum rotor 20 may be circular, rectangular, triangular or other irregular shapes. Those skilled in the art will understand that its outer shape and size are not limited to those shown in this embodiment, as long as they are sufficient to implement the present invention.

[0069] It is understandable that a permanent magnet 23 is usually arranged on the inner wall of the drum rotor 20 , and the permanent magnet 23 is surrounded by a plurality of permanent magnet sheets to form a cylindrical structure, so that the permanent magnet 23 of the cylindrical structure can be arranged in the gap between the drum rotor 20 and the stator 10 and arranged around the stator 10 .

[0070] It is worth mentioning that the outer rotor motor can adopt various existing motor types. Exemplarily, the outer rotor motor is one of the outer rotor DC brushless motor, outer rotor DC brushless motor, outer rotor AC brushless motor, outer rotor AC brushless motor and the like.

[0071] Based on the above structure, an end cover 30 is further installed at the end of the drum rotor 20. The end cover 30 is installed at one of the above mounting holes 22 to protect the stator 10 and related structural components inside the outer rotor motor.

[0072] In one embodiment, the above-mentioned mounting hole 22 is provided at one end of the drum rotor 20, and the size of the mounting hole 22 is set to be larger than the stator 10, so as to ensure that the stator 10 can be installed in the accommodating space 21 of the drum rotor 20 through the mounting hole 22. The other end of the drum rotor 20 can be configured as a closed structure, and a support structure for supporting one end of the motor shaft 11 is provided inside the closed end of the drum rotor 20. Of course, this end of the motor shaft 11 can also be set to have no matching relationship with the drum rotor 20, so that the stator 10 is in a cantilever structure in the accommodating space 21. A through hole corresponding to the motor shaft 11 is provided at the end cover 30, so that the end of the motor shaft 11 can pass through the through hole through the end cover 30 to the outside of the drum rotor 20;

[0073] In another embodiment, the above-mentioned mounting holes 22 can be opened at both opposite ends of the drum rotor 20, wherein the sizes of the two mounting holes 22 can be configured to be larger than the size of the stator 10, so that the stator 10 can be selectively assembled into the accommodating space 21 from one of the mounting holes 22. Of course, the two mounting holes 22 can also be configured so that one of them is larger than the size of the stator 10, and the end cover 30 is covered on the mounting hole 22, and the other is configured to be slightly larger than the diameter of the motor shaft 11, so that the motor shaft 11 can pass through the mounting hole 22 to the outside of the drum rotor 20. Similarly, in this embodiment, a through hole corresponding to the motor shaft 11 needs to be opened on the end cover 30 to allow one end of the motor shaft 11 to pass through it.

[0074] It should be understood that no matter which of the above embodiments is used to assemble the stator 10 and the drum rotor 20 , the motor shaft 11 and the drum rotor 20 and the end cover 30 must be configured to be relatively rotatable to ensure that the drum rotor 20 can rotate normally relative to the stator 10 .

[0075] In one embodiment, a bearing may be provided between the drum rotor 20 and the motor shaft 11 , and / or between the end cover 30 and the motor shaft 11 , so that the drum rotor 20 can be supported by the motor shaft 11 , thereby ensuring smooth rotation of the drum rotor 20 .

[0076] Please continue to refer to the attached Figure 1 , Figure 4-Figure 5 , continuing from the above embodiment, a plurality of first blades 31 are evenly distributed around the outer periphery of the end cover 30 on the side facing away from the drum rotor 20 .

[0077] In order to facilitate the understanding of this embodiment, the side of the end cover 30 close to the drum rotor 20 is defined as the inner side of the end cover 30. Figure 4-Figure 5 On the contrary, the side of the end cover 30 facing away from the drum rotor 20 is defined as the outer side of the end cover 30. Figure 4-Figure 5The arrow in the middle indicates the “outward” direction. The first blades 31 described above are all arranged on the outside of the end cover 30, and a plurality of first blades 31 are arranged at equal intervals along the outer periphery of the outer side of the end cover 30 (which can also be understood as the outer edge).

[0078] According to the above content, it can be known that when the end cover 30 is provided at only one end of the drum rotor 20, the first fan blade 31 is formed at only one end of the drum rotor 20; and when the end covers 30 are provided at both opposite ends of the drum rotor 20, the first fan blade 31 is formed at both opposite ends of the drum rotor 20.

[0079] In the following, taking the case where end covers 30 are provided at both opposite ends of the drum rotor 20 as an example, the end covers 30 disposed at the opposite ends of the drum rotor 20 are coaxially installed at both ends of the outer rotor motor, so that the outer rotor motor can synchronously drive the two ends to rotate in the same direction through the drum rotor 20.

[0080] A reinforcing rib 32 is protruded between any two adjacent first blades 31 , and the first blades 31 and the reinforcing rib 32 are protruded on the surface of the outer side of the end cover 30 , so that a counterweight groove 33 is formed between any two adjacent first blades 31 and the reinforcing rib 32 .

[0081] As described above, since the first blades 31 and the reinforcing ribs 32 are both convexly arranged on the outer surface of the end cover 30, the outer rotor motor can increase the contact surface between the end cover 30 and the external air by evenly distributing the first blades 31 and the reinforcing ribs 32 on the end cover 30. The heat generated in the accommodating space 21 can be transferred to the end cover 30 through the drum rotor 20, and when the heat is transferred to the first blades 31 and the reinforcing ribs 32 on the end cover 30, the end cover 30 can better exchange heat with the external air of the outer rotor motor. In addition, since the first blades 31 and the reinforcing ribs 32 are alternately arranged around the outer side of the end cover 30, the heat inside the outer rotor motor can be more evenly distributed to all parts of the end cover 30, ensuring that the outer rotor motor has good heat dissipation performance.

[0082] During the rotation of the drum rotor 20 relative to the stator 10, the first fan blades 31 distributed on the outer periphery of the end cover 30 can better cut the air, making the air supply more natural and soft, reducing the motor noise and vibration, while also improving the heat exchange efficiency of the motor's original heat dissipation structure, so that the heat dissipation performance of the outer rotor motor is further improved.

[0083] The reinforcing ribs 32 not only improve the heat dissipation performance of the end cover 30, but also enhance the structural strength of the end cover 30, reduce the vibration generated by the end cover 30 and even the motor as a whole, and make the motor run more smoothly. At the same time, since the reinforcing ribs 32 are arranged between any two adjacent first blades 31, the number of first blades 31 arranged on the end cover 30 of the outer rotor motor is less (sparser) than the number of blades of a traditional outer rotor motor. For example, in the case where the number of blades of a traditional outer rotor motor is 24, the outer rotor motor can control the number of first blades 31 to 12 by arranging reinforcing ribs 32 between the first blades 31. The spacing between the first blades 31 is larger, so that the air outside the outer rotor motor flows more softly after being cut by the first blades 31. On the basis of improving the heat dissipation performance of the outer rotor motor, the vibration and noise of the outer rotor motor are alleviated to a certain extent, and the structural strength of the end cover 30 will not be damaged.

[0084] The counterweight groove 33 is formed between the first blade 31 and the reinforcing rib 32, so that the matching relationship between the counterweight groove 33, the reinforcing rib 32 and the first blade 31 is more compact. The first blade 31 and the reinforcing rib 32 are alternately arranged on the end cover 30, which makes the overall layout of the outer rotor motor more reasonable. The first blade 31 and the reinforcing rib 32, the first blade 31 and the counterweight groove 33, and the reinforcing rib 32 and the counterweight groove 33 are all formed with a corresponding matching relationship instead of being independent and separated from each other. The reinforcing rib 32 cooperates with the first blade 31 to form the counterweight groove 33, which is also conducive to the miniaturization and lightweight design of the outer rotor motor. In addition, the counterweight groove 33 can also provide corresponding accommodation space for counterweight structures such as counterweight blocks and balancing mud, so as to meet the balance and debugging of the outer rotor motor in the later stage, so that the balance of the equipment during operation can be further compensated and improved.

[0085] In one embodiment, the first fan blade 31 and the reinforcing rib 32 are all formed with the end cover 30 by an integrated molding process, which not only saves the installation time of the corresponding structure on the end cover 30, but also further improves the structural strength of the end cover 30. Moreover, there is no need to adopt an assembly structure to cooperate between the first fan blade 31 and the end cover 30, and between the reinforcing rib 32 and the end cover 30. This also makes the overall structure of the end cover 30 more compact, meeting the above-mentioned lightweight and miniaturized design requirements. In this way, the outer rotor motor can not only be better used in equipment with a smaller installation space, but also can stably exert its corresponding performance when it is in a relatively narrow installation space, thereby meeting the current use requirements for the outer rotor motor.

[0086] According to the above embodiments, it can be understood that, under the premise that the first blades 31 and the reinforcing ribs 32 jointly define the counterweight slots 33, the number of the first blades 31 and the reinforcing ribs 32 are both at least two, and it should be understood that the number of the counterweight slots 33 located on the end cover 30 is at least four, and each counterweight slot 33 is independently arranged, and the length of each counterweight slot 33 extending along the outer periphery of the end cover 30 is the same because the spacing between any two adjacent first blades 31 and the reinforcing ribs 32 is equal, and at least four counterweight slots 33 are evenly distributed on the outer periphery of the end cover 30 along the circumferential direction of the end cover 30. Exemplarily, the number of counterweight slots 33 can be set to 4, 6, 8, etc. according to the number of the first blades 31 and the reinforcing ribs 32, so that the corresponding number of counterweight blocks, balancing mud, etc. can be set in the counterweight slots 33 at the corresponding positions according to the dynamic balance of the current external rotor motor.

[0087] It is understandable that the counterweight block can be formed of resin material by thermoplastic means and fixed in the counterweight slot 33, which is conducive to reducing the production process. Alternatively, the counterweight block can also be installed in the counterweight slot 33 by gluing, clamping, etc. This embodiment is not specifically limited here.

[0088] The balancing mud is usually made of clay or similar materials, and can be placed in the counterweight groove 33 by filling, coating, etc.

[0089] Please continue to refer to the attached Figure 1 , Figure 4-Figure 5 The end cover 30 is also evenly distributed with a plurality of second blades 34 around its circumference, and a ventilation hole 35 connecting the inside and the outside of the drum rotor 20 is formed between any two adjacent second blades 34 .

[0090] In the above embodiment, when the second fan blade 34 rotates with the end cover 30, the second fan blade 34 can generate negative pressure on the inner side of the end cover 30 to suck the air outside the end cover 30 into the accommodating space 21 in the drum rotor 20 to achieve heat exchange with the inside of the outer rotor motor, and / or, the second fan blade 34 can generate negative pressure on the outer side of the end cover 30 to draw the air in the accommodating space 21 to the outside of the drum rotor 20.

[0091] According to the above embodiment, when the end cover 30 is only provided at one end of the drum rotor 20, the second fan blade 34 on the end cover 30 is configured to generate negative pressure on the inner side of the end cover 30, and an exhaust port is opened at the other end of the drum rotor 20, so that the air entering the accommodating space 21 from the end cover 30 and exchanging heat with the inside of the outer rotor motor can be discharged from the device through the exhaust port; or, the second fan blade 34 on the end cover 30 is configured to generate negative pressure on the outer side of the end cover 30, and an air inlet and outlet are opened at the other end of the drum rotor 20.

[0092] When the second blades 34 are provided at both opposite ends of the drum rotor 20, the second blades 34 on one end cover 30 are configured to generate negative pressure on the inner side of the end cover 30, and the second blades 34 on the other end cover 30 are configured to generate negative pressure on the outer side of the end cover 30, thereby forming a form of air suction at one end and air exhaust at the other end, thereby improving the heat exchange efficiency of the outer rotor motor.

[0093] On the basis of the above-mentioned embodiment, each first blade 31 is located at the end of each second blade 34 away from the motor shaft 11 to form a form in which "outer ring blades" and "inner ring blades" cooperate with each other. It can be understood that the angle and shape of the second blade 34 as the inner ring blade can be set to be different from the angle and shape of the first blade 31 as the outer ring blade to adapt to different heat dissipation requirements. For example, the second blade 34 can be set to have an inclination angle greater than the inclination angle of the first blade 31, so as to more effectively draw external air into the interior of the motor and take away the heat inside the motor from the interior of the motor, while the second blade 34 can be set to be flatter than the first blade 31 to more evenly distribute heat and cut the external air to assist the second blade 34 in inhaling or exhausting air.

[0094] In addition, in this embodiment, the number of first blades 31 is greater than the number of second blades 34. The first blades 31 with a larger number can form a positive pressure or negative pressure vortex on the outside of the end cover 30 when the end cover 30 rotates, so that while cooperating with the rotation of the second blades 34, the airflow can be more efficiently sucked into the accommodating space 21 or extracted from the accommodating space 21, so that on the basis of the above-mentioned arrangement of the first blades 31 on the outer periphery of the end cover 30, the heat dissipation performance of the outer rotor motor can be further improved.

[0095] By implementing the above embodiment, when the drum rotor 20 drives the end covers 30 at both ends to rotate synchronously, the air around the first blade 31 assembly of one end cover 30 enters the accommodating space 21 axially from the ventilation hole 35 under a certain pressure, and the air is rectified and pushed by the first blade 31 and the second blade 34, and then accelerated and transported in the direction of the stator 10, and then discharged to the other end cover 30, and is cut and rectified by the first blade 31 and the second blade 34 at the other end, and finally blown out of the outer rotor motor through the ventilation hole 35.

[0096] Continuing with the example of two end covers 30, the two end covers 30 are coaxially installed and synchronously driven by a drum rotor 20. This not only helps to save the volume of the motor, but also allows the air flow passing through the two end covers 30 in sequence to flow along almost the same straight line path, so that the air supply effects are superimposed, thereby improving the heat dissipation performance of the outer rotor motor.

[0097] Based on any of the above embodiments, the following provides an embodiment of a specific structural form of the end cover 30, please refer to the attached Figure 4-Figure 5 The end cover 30 specifically includes a support inner ring 36 and a support outer ring 37, wherein the support inner ring 36 and the support outer ring 37 are both roughly annular structures, and the middle parts of the support inner ring 36 and the support outer ring 37 are provided with through holes penetrating the opposite sides thereof. Specifically, the support inner ring 36 is provided with a through axial hole 361. When the stator 10 is arranged inside the drum rotor 20 and the end cover 30 is installed on the drum rotor 20, the motor shaft 11 passes through the outside of the end cover 30 through the axial hole 361, and the support inner ring 36 is evenly distributed with a plurality of second fan blades 34 around its outer periphery. The support outer ring 37 is arranged around the outside of the support inner ring 36 through the through hole structure opened thereon, and the support inner ring 36 and the support outer ring 37 are connected through the second fan blade 34, and the opposite ends of the second fan blade 34 are respectively connected to the support inner ring 36 and the support outer ring 37, so that the gap between the support outer ring 37 and the support inner ring 36 forms the ventilation hole 35 between any two adjacent second fan blades 34, and each first fan blade 31 and the reinforcement rib 32 are arranged around the support outer ring 37.

[0098] By implementing the above technical solution, the opposite ends of the second fan blade 34 are supported by the supporting inner ring 36 and the supporting outer ring 37, so that the second fan blade 34, which is larger in size than the first fan blade 31, can have stronger stability during operation, so as to avoid the vibration of the outer rotor motor as a whole due to the vibration of the second fan blade 34 to a certain extent, and also improve the overall structural strength of the end cover 30, so that the reliability of the outer rotor motor is stronger.

[0099] It is worth mentioning that regarding the thickness of the second blade 34, since the second blade 34 is connected to the supporting inner ring 36 and the supporting outer ring 37, if the thickness of the second blade 34 is set too thin, it is easy to cause the overall structural strength of the end cover 30 to be insufficient. When the drum rotor 20 is running at high speed, the end cover 30 is easily damaged. At the same time, a second blade 34 that is too thin is not conducive to the overall processing of the end cover 30, which increases the difficulty of processing the end cover 30, and then leads to a scrap rate and cost increase. However, the thickness of the second blade 34 should not be set too thick. A second blade 34 that is too thick cannot achieve a good effect of cutting and squeezing air, and the heat dissipation performance of the outer rotor motor will decrease. Therefore, in this embodiment, the thickness of the second blade 34 can be set at 1.5 to 4.5 mm according to the overall size of the outer rotor motor.

[0100] Furthermore, the width of the second blade 34 along the axial projection of the end cover 30 gradually increases from one end of the supporting inner ring 36 to one end of the supporting outer ring 37, so that the radial dimensions of the ventilation holes 35 between adjacent second blades 34 are as consistent as possible to maintain a stable and uniform wind speed.

[0101] According to the above embodiment of the end cover 30 including the supporting inner ring 36 and the supporting outer ring 37 structure, please refer to the attached Figure 4-Figure 5 As one of the specific structural implementations of the support outer ring 37, the support outer ring 37 of this implementation includes a first side wall 371 and a second side wall 372, wherein the first side wall 371 and the second side wall 372 are both circular ring structures, and the matching relationship between the two on the end cover 30 is similar to the matching relationship between the support inner ring 36 and the support outer ring 37, and both are in a mutually nested matching relationship.

[0102] Specifically, the first side wall 371 is spaced around the supporting inner ring 36, the opposite ends of the second fan blade 34 are respectively connected to the supporting inner ring 36 and the inner wall surface of the first side wall 371, and the second side wall 372 is spaced around the first side wall 371 to form a space gap between the first side wall 371 and the first side wall 371 for the first fan blade 31 and the reinforcing rib 32 to be set, and the opposite ends of the first fan blade 31 and the reinforcing rib 32 are respectively connected to the outer wall surface of the first side wall 371 and the inner wall surface of the second side wall 372.

[0103] By implementing the above technical solution, the opposite ends of the first blade 31 and the reinforcing rib 32 are supported by the first side wall 371 and the second side wall 372, so that the structure of the first blade 31 on the end cover 30 is more stable, while the reinforcing rib 32 can play its maximum role and maintain the structural strength of the supporting outer ring 37 at a relatively high level. In this way, on the basis of ensuring that the supporting outer ring 37 has a high structural strength, the overall strength of the end cover 30 can be improved, so that the end cover 30 has stronger stability when it runs with the drum rotor 20.

[0104] Continuing with the above embodiment, in order to allow the above structure to form a counterweight groove 33 that can carry a counterweight block and balancing mud between the first fan blade 31 and the reinforcement rib 32, the first fan blade 31, the reinforcement rib 32 and the above-mentioned first side wall 371 and the second side wall 372 cooperate to enclose and form a side wall structure located on the outer periphery of the counterweight groove 33, and the inner side of the end cover 30 is also provided with a sealing plate for closing the inner opening of the above-mentioned side wall structure, so that the groove bottom structure of the counterweight groove 33 is formed through the sealing plate, and the groove opening of the counterweight groove 33 is connected to the external environment through the outer side of the end cover 30, so that the counterweight block and balancing mud can be set in the counterweight groove 33 through the groove opening.

[0105] In one embodiment, if Figure 4-Figure 5As shown, the first side wall 371 protrudes axially from the second side wall 372 so that the line between the end of the first side wall 371 and the end of the second side wall 372 is inclined outwardly to the rotation axis of the outer rotor motor, and the end of the first fan blade 31 is inclined from the inside to the outside toward the direction close to the second side wall 372, so that the first fan blade 31 has a better rectifying effect during the rotation with the end cover 30, thereby enhancing the auxiliary effect on the second fan blade 34.

[0106] like Figure 4-Figure 5 As shown, the end of the first blade 31 close to the first side wall 371 is flush with the end surface of the first side wall 371, and the length dimension of the end of the first blade 31 close to the second side wall 372 is greater than the length dimension of the second side, so that the first blade 31 as a whole protrudes from the end of the second side wall 372, so that the portion of the first blade 31 exposed outside the supporting outer ring 37 is larger, thereby improving the rectification effect of the first blade 31 during operation.

[0107] The end of the reinforcing rib 32 is flush with the end of the second side wall 372, that is, the height of the reinforcing rib 32 is less than or equal to the second side wall 372, which ensures that the supporting outer ring 37 has a strong structural strength while preventing the reinforcing rib 32 from blocking the windward surface of the first blade 31, so that the first blade 31 has a higher rectification efficiency.

[0108] Please refer to the attached Figure 1-Figure 5 In one embodiment, an implementation method in which end covers 30 are provided at both opposite ends of the drum rotor 20 is taken as an example. In order to facilitate the understanding of this implementation method, this embodiment defines one end of the drum rotor 20 as the air inlet end, and the other opposite end of the drum rotor 20 as the air outlet end. The end cover 30 of the drum rotor 20 located at the air inlet end is defined as an air inlet cover 38, and the end cover 30 of the drum rotor 20 located at the air outlet end is defined as an air outlet cover 39. The second blades 34 of the air inlet cover 38 and the second blades 34 of the air outlet cover 39 are inclined in the same direction to ensure that when the air inlet cover 38 and the air outlet cover 39 operate synchronously with the drum rotor 20, the air inlet cover 38 is configured to suck air outside the outer rotor motor into the accommodating space 21, and the air outlet cover 39 is configured to draw the pores in the accommodating space 21 out of the accommodating space 21.

[0109] In one embodiment, the number of the second blades 34 of the air inlet cover 38 is greater than the number of the second blades 34 of the air outlet cover 39. Specifically, those skilled in the art may select the number of the second blades 34 of the air inlet cover 38 and the number of the second blades 34 of the air outlet cover 39 according to actual needs.

[0110] For example, regarding the number of second blades 34, an even number of second blades 34 is likely to cause resonance between the end cover 30 and the drum rotor 20, thereby resulting in the generation of high-frequency noise, while too few blades will cause insufficient connection strength between the end cover 30 supporting the inner ring 36 and the outer ring 37, resulting in damage to the end cover 30. Therefore, the number of second blades 34 in each end cover 30 is preferably an odd number, while the number of second blades 34 is ensured to be 5 or more.

[0111] Exemplarily, when the number of the second fan blades 34 located at the air inlet cover 38 is 5, the number of the second fan blades 34 located at the air outlet cover 39 can be set to 7.

[0112] It can be understood that the number of the second fan blades 34 located at the air inlet cover 38 is 2-4 more than the number of the second fan blades 34 located at the air outlet cover 39, so that the air inlet end of the drum rotor 20 can introduce more air than the air outlet end, thereby improving the heat exchange efficiency in the accommodating space 21 and reducing the collapse effect of the airflow at both ends of the drum rotor 20.

[0113] Of course, in other embodiments, on the basis of ensuring that the number of second fan blades 34 is an odd number, the number of second fan blades 34 of the air inlet cover body 38 can also be set to 7 leaves, 9 leaves, 11 leaves or more, and corresponding to the number of second fan blades 34 of the air inlet cover body 38, the number of second fan blades 34 located in the air inlet cover body 38 can be set to 9 leaves, 11 leaves, 13 leaves or even more.

[0114] Of course, in order to adapt to the application of the external rotor motor in equipment with relatively narrow installation space, the air inlet cover 38 and the air outlet cover 39 should be configured to use as few fan blades as possible while ensuring that the end cover 30 has sufficient strength. Therefore, the number of the second fan blades 34 of the air inlet cover 38 of this embodiment is set to 7 blades, and the number of the second fan blades 34 of the air outlet cover 39 is set to 5 blades.

[0115] As for the number of the first blades 31, since the first blades 31 are mainly used to rectify the air outside the outer rotor motor, there are no ventilation holes 35 between the first blades 31 for inhaling and exhausting air. Therefore, the present embodiment does not have the above-mentioned number requirements related to odd numbers and even numbers for the number of the first blades 31. For example, in the present embodiment, the number of the first blades 31 of the air inlet cover 38 is the same as the number of the first blades 31 of the air outlet cover 39, both of which are 12 blades. Of course, the number of the first blades 31 can also be determined according to the actual use requirements of the outer rotor motor.

[0116] When the number of first fan blades 31 is set to 12, compared with the technical solution of setting the outer ring fan blades to a multiple of 24 blades in the traditional outer rotor motor, using fewer first fan blades 31 can not only reduce the processing cost of the end cover 30, but also increase the spacing between the first fan blades 31, and help improve the cutting and rectification efficiency of each first fan blade 31 for the external air of the outer rotor motor. Each first fan blade 31 cuts more air, and the cutting frequency of the external air of the outer rotor motor is smaller, which can make the air cut and rectified by the first fan blades 31 softer, thereby helping to improve the heat dissipation efficiency of the outer rotor motor and reduce the vibration and noise of the outer rotor motor.

[0117] The utility model also provides a fitness equipment, and the outer rotor motor described in any of the above embodiments can be applied to the fitness equipment. Exemplarily, the fitness equipment can be a treadmill, a spinning bike, a stair climbing machine, an elliptical machine, a power station, etc.

[0118] The fitness equipment includes an equipment body as the overall supporting basis of the equipment, and a moving part that can move relative to the equipment body is arranged on the equipment body. In this embodiment, the moving part is a part of the fitness equipment used to provide users with fitness movements to achieve fitness effects. For example, when the fitness equipment is a treadmill, the moving part can be set as a running belt movably arranged on the equipment body, and when the fitness equipment is a spinning bike, the moving part can be set as a foot pedal movably arranged on the equipment body, etc.

[0119] The outer rotor motor in the above embodiment is installed on the equipment body through the motor shaft 11, so that the stator 10 of the outer rotor motor is relatively fixed to the equipment body through its motor shaft 11, and at least one end cover 30 located on the drum rotor 20 is connected to the output part 40, and the drum rotor 20 is driven to the moving part through the output part 40.

[0120] Exemplarily, the output part 40 can be set to a pulley, a gear, a sprocket, etc. according to the product design requirements of the fitness equipment. When the output part 40 is a pulley, the output part 40 is driven to the moving part of the fitness equipment through a belt. When the output part 40 is a gear, the output part 40 is driven to the moving part of the fitness equipment through a gear set. When the output part 40 is a sprocket, the output part 40 is driven to the moving part of the fitness equipment through a chain.

[0121] In summary, the outer rotor motor provided by the utility model, through the reasonable layout design of its heat dissipation structure and counterweight structure, allows the outer rotor motor to be better applied to fitness equipment with relatively narrow installation space. Moreover, in the application scenario of fitness equipment with relatively narrow installation space, the outer rotor motor can also ensure that it has excellent heat dissipation performance and motion performance. At the same time, the dynamic balance of the outer rotor motor can be adjusted through the counterweight slot 33, thereby ensuring the stable operation of the fitness equipment, which is beneficial to extending the service life of the equipment and improving the user experience.

[0122] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., and other directions or positional relationships are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0123] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0124] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0125] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. An outer rotor motor, characterized in that: include: stator (10); A drum rotor (20) is rotatably mounted on the stator (10); A motor shaft (11), connected to the stator (10) and extending in the axial direction; An end cover (30) is mounted on the end of the drum rotor (20), and the motor shaft (11) passes through the end cover (30) and out of the outside of the drum rotor (20); A plurality of first blades (31) are evenly distributed around the outer periphery of the end cover (30) on one side facing away from the drum rotor (20), and a reinforcing rib (32) is protruded between any two adjacent first blades (31), and a counterweight groove (33) is formed between any two adjacent first blades (31) and the reinforcing rib (32).

2. The outer rotor motor according to claim 1, characterized in that: The end cover (30) is also provided with a plurality of second blades (34) evenly distributed around its circumference, and a ventilation hole (35) communicating with the inside and outside of the drum rotor (20) is formed between any two adjacent second blades (34); Each of the first fan blades (31) is located at an end of each of the second fan blades (34) away from the motor shaft (11), and the number of the first fan blades (31) is greater than the number of the second fan blades (34).

3. The outer rotor motor according to claim 1, characterized in that: The end cap (30) comprises: The support inner ring (36) is provided with a through shaft hole (361), the motor shaft (11) passes through the shaft hole (361) and exits the outside of the end cover (30), and the support inner ring (36) is evenly distributed with a plurality of second blades (34) around its outer periphery; The supporting outer ring (37) is arranged around the supporting inner ring (36) at intervals, and the opposite ends of the second fan blade (34) are respectively connected to the supporting inner ring (36) and the supporting outer ring (37), and each of the first fan blades (31) and the reinforcing ribs (32) are arranged around the supporting outer ring (37).

4. The outer rotor motor according to claim 3, characterized in that: The supporting outer ring (37) comprises: A first side wall (371) is spaced around the supporting inner ring (36), and opposite ends of the second blade (34) are respectively connected to the supporting inner ring (36) and the inner wall surface of the first side wall (371); The second side wall (372) is spaced around the first side wall (371), and the opposite ends of the first fan blade (31) and the reinforcing rib (32) are respectively connected to the outer wall surface of the first side wall (371) and the inner wall surface of the second side wall (372).

5. The outer rotor motor according to claim 4, characterized in that: The first side wall (371) protrudes axially from the second side wall (372), and the end of the first blade (31) is inclined from the inside to the outside; The end of the reinforcing rib (32) is arranged flush with the end of the second side wall (372).

6. The outer rotor motor according to any one of claims 2 to 5, characterized in that: The end covers (30) are provided at opposite ends of the drum rotor (20), an air inlet cover (38) is provided at the first end of the drum rotor (20), and an air outlet cover (39) is provided at the second end of the drum rotor (20); The inclination direction of the second fan blade (34) of the air inlet cover body (38) and the inclination direction of the second fan blade (34) of the air outlet cover body (39) are consistent.

7. The outer rotor motor according to claim 6, characterized in that: The number of the second fan blades (34) of the air inlet cover (38) is greater than the number of the second fan blades (34) of the air outlet cover (39).

8. The outer rotor motor according to claim 6, characterized in that: The number of the second fan blades (34) of the air inlet cover (38) is 7, and the number of the second fan blades (34) of the air outlet cover (39) is 5.

9. The outer rotor motor according to claim 6, characterized in that: The number of the first fan blades (31) of the air inlet cover (38) is consistent with the number of the first fan blades (31) of the air outlet cover (39), both of which are 12 blades.

10. A fitness equipment, characterized in that: include: The device body is provided with a movable moving part; The outer rotor motor according to any one of claims 1 to 9 is mounted on the equipment body via the motor shaft (11), at least one of the end covers (30) is connected to an output part (40), and the drum rotor (20) is driven to the moving part via the output part (40).

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