A compact motor

Abstract

The utility model discloses a motor with a compact structure, which belongs to the field of drive devices and solves the problems of poor heat dissipation effect and large volume of existing motors. The technical solution to solve the problem mainly includes a housing, a stator and a rotor. The stator is fixed on the inner wall of the housing and is located on the radial side of the rotor core. The rotor includes a rotating shaft, a magnetic core fixedly sleeved on the rotating shaft, a shaft sleeve and a commutator, and a rotor winding wound on the magnetic core. The shaft sleeve is located between the magnetic core and the commutator. A ventilation hole is provided on the housing. A fan is provided between the magnetic core and the commutator. The fan is fixed on the magnetic core and sleeved outside the shaft sleeve. The utility model is mainly used to achieve the advantages of a motor having a good heat dissipation effect and a more compact structure.

Description

Technical Field

[0001] The utility model relates to the field of driving devices, in particular to a motor with a compact structure. Background Art

[0002] The motor in the prior art usually includes a housing, a stator and a rotor. The rotor includes a rotating shaft, a magnetic core fixedly mounted on the rotating shaft, a sleeve and a commutator, and a rotor winding wound on the magnetic core. The sleeve is located between the rotor magnetic core and the commutator. When the motor is running, the temperature of the rotor magnetic core and the commutator will rise sharply. Therefore, in the prior art, such as utility models CN201038921Y and CN214205269U, a fan is arranged in the motor. The fan is arranged at one end of the rotating shaft, and the rotor magnetic core and the commutator are arranged at the other end of the rotating shaft, resulting in a long distance between one of the rotor magnetic core and the commutator and the fan. The heat dissipation air blown out by the fan is related to the distance, resulting in poor heat dissipation effect. In addition, the fan is located on the axial side of the sleeve on the rotating shaft, resulting in the need to reserve additional space on the rotating shaft for installing the fan. The axial size of the motor is greatly increased, resulting in a larger volume of the motor. Utility Model Content

[0003] The utility model aims to provide a motor with a compact structure, which solves the problems of poor heat dissipation effect and large volume of existing motors, and realizes the advantages of the motor having both good heat dissipation effect and more compact structure.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a compact motor, including a shell, a stator and a rotor, the stator is fixed on the inner wall of the shell and is located on the radial side of the rotor, the rotor includes a rotating shaft, a magnetic core fixedly sleeved on the rotating shaft, a sleeve and a commutator, and a rotor winding wound on the magnetic core, the sleeve is located between the magnetic core and the commutator, the shell is provided with ventilation holes, a fan is provided between the magnetic core and the commutator, and the fan is fixed on the magnetic core and sleeved outside the sleeve.

[0005] After adopting the above technical scheme, the utility model has the following advantages: first, the fan is located between the magnetic core and the commutator, so that the magnetic core and the commutator are both arranged closer to the fan at the same time, which is conducive to the airflow generated by the fan directly acting on the commutator or the magnetic core, quickly taking away the heat, effectively preventing overheating, and protecting the electrical performance and service life of the commutator and the magnetic core. The space between the magnetic core and the commutator can also be effectively utilized, which is conducive to the compact design of the motor. Secondly, the fan is fixed on the magnetic core and sleeved outside the shaft sleeve. Compared with the prior art where the fan is arranged on the axial side of the shaft sleeve, the axial dimension of the rotating shaft is effectively shortened, making the structure of the motor more compact.

[0006] Furthermore, the commutator is located on a side close to an output end of the motor, and the fan is located on a side close to an output end of the motor.

[0007] By adopting the above technical solution, by arranging the fan and commutator close to the motor output end, the internal space layout of the motor can be optimized, making the motor design more compact. The fan and commutator can also be more easily accessed when performing motor maintenance or cleaning, which is convenient for daily maintenance and troubleshooting.

[0008] Furthermore, the magnetic core is provided with a magnetic groove, and the fan includes a fixing ring, a fan blade and a fixing rib, the fixing ring is located on the radial side of the sleeve and is spaced apart from the sleeve, the fan blade is arranged on the fixing ring along the radial direction of the rotating shaft, the fixing rib is arranged on the fixing ring along the axial direction of the rotating shaft, and the fan blade is inserted into the magnetic groove through the fixing rib and fixed.

[0009] By adopting the above technical solution, the fixing ring and the shaft sleeve are arranged at intervals, which not only ensures the effective operating space of the fan, but also avoids direct contact with the shaft sleeve, reducing unnecessary friction and wear. At the same time, this layout realizes the maximum integration of functions in the limited motor space. Secondly, the installation process of the fan is simplified by the plug-in fixing method of the fixing ribs and the magnetic slots, without the need for complex fixing structures, and also facilitates subsequent maintenance and replacement. Finally, the fan blades are arranged radially along the shaft, which can increase the airflow coverage area of ​​the fan output and further enhance the heat dissipation effect on the magnetic core and commutator.

[0010] Furthermore, the axial dimension of the fan blade is D1, the axial dimension of the fixing ring is D2, and D1≥D2.

[0011] By adopting the above technical solution and reasonably setting the size of the fan blade, it is possible to ensure that the fixing ring can effectively support the fan blade and reduce the axial size of the fixing ring as much as possible, thereby reducing the space occupied by the fixing ring inside the motor and making the structure of the motor more compact. If D1<D2, the fixing ring will occupy a larger space in the axial direction. For motors with limited space, the size of the motor needs to be increased to meet the installation requirements of the fixing ring, resulting in a larger motor.

[0012] Furthermore, the maximum radial dimension of the fan blade is D3, the radial dimension of the magnetic core is D4, the radial dimension of the stator is D5, and D4<D3≤D5.

[0013] By adopting the above technical solution, the maximum radial dimension D3 of the fan blade is larger than the radial dimension D4 of the magnetic core. The fan blade can completely cover or even exceed the outer edge of the magnetic core, and can also dissipate heat for the outer edge of the magnetic core, which can effectively dissipate heat for the magnetic core. If the maximum radial dimension D3 of the fan blade is less than or equal to the radial dimension D4 of the magnetic core, the fan blade cannot completely cover the magnetic core, resulting in the part of the magnetic core not covered by the fan blade not being effectively dissipated. Secondly, the maximum radial dimension D3 of the fan blade is smaller than the radial dimension of the stator, and there is no need to increase the radial dimension of the motor, so that the size of the motor is more compact. If the maximum radial dimension D3 of the fan blade is greater than or equal to the radial dimension of the stator, it is necessary to increase the radial dimension of the motor, so that the size of the motor is increased.

[0014] Furthermore, the axial dimension of the stator is larger than the axial dimension of the magnetic core so that the stator is protruded relative to both ends of the magnetic core, an avoidance gap is provided between the fan blade and the stator, and an air inlet gap is provided between the fan blade and the magnetic core.

[0015] With the above technical solution, the air inlet gap between the fan blade and the magnetic core ensures that the air can flow smoothly into the magnetic core and directly act on the heating area of ​​the magnetic core, especially dissipating the heat of the rotor winding wound on the magnetic core, thereby improving the heat dissipation efficiency. At the same time, the avoidance gap prevents the fan blade from contacting the stator when rotating, reducing wind resistance, facilitating smooth airflow, further optimizing heat dissipation performance, and also preventing the fan blade from colliding or rubbing with the stator when rotating at high speed.

[0016] Furthermore, the windward surface of the fan blade is a curved surface, and the windward surface is inclined relative to the axial cross section of the fixing ring.

[0017] By adopting the above technical solution, the curved surface design can enable the fan blades to capture and accelerate air more effectively when rotating. Compared with flat fan blades, the curved surface can guide the airflow more smoothly and reduce separation, thereby generating greater wind pressure and air volume at the same speed, improving ventilation or cooling efficiency. The inclined setting of the windward surface helps the airflow to smoothly transition along the surface of the fan blade, reducing the noise generated by the airflow separation point, and can improve the dynamic characteristics of the airflow around the fan blades, reduce the airflow noise, and make the fan run quieter.

[0018] Furthermore, there are a plurality of fan blades, and the plurality of fan blades are arranged at intervals along the circumference of the fixing ring, a ventilation duct is formed between two adjacent fan blades, and the fixing ribs extend into the ventilation duct and are arranged to protrude relative to the surface of the fixing ring.

[0019] By adopting the above technical solution, multiple blades are arranged at intervals along the circumference of the fixed ring, which can cut the air more evenly, forming a continuous and stable airflow, thereby improving the uniformity and stability of the wind output. Secondly, the fixed ribs extend into the ventilation duct and are arranged to be raised relative to the surface of the fixed ring, which can increase the turbulence of the airflow and effectively increase the wind pressure, so that the fan can output a larger air volume at the same speed, or achieve the same heat dissipation effect at a lower speed.

[0020] Furthermore, the motor also includes a circuit board, and the circuit board is located on a side close to the commutator.

[0021] By adopting the above technical solution, the circuit board is arranged near the commutator, which helps to reduce the overall size of the motor and meet the needs of miniaturization and lightweight design. Secondly, the airflow generated by the fan can also dissipate heat from the circuit board and greatly shorten the connection length between the electronic components and the commutator, making the internal wiring of the motor more reasonable.

[0022] Furthermore, the ventilation holes include a first ventilation hole and a second ventilation hole arranged opposite to the first ventilation hole, the first ventilation hole is arranged toward the commutator, the second ventilation hole is arranged toward the magnetic core, and the fan is located between the first ventilation hole and the second ventilation hole.

[0023] By adopting the above technical solution, the fan is located between the first ventilation hole and the second ventilation hole, and can directly inhale fresh air from one of the first ventilation hole and the second ventilation hole, and blow it to the commutator, the magnetic core and other key heat-generating components. Then, the hot air is discharged to the outside of the motor through the first ventilation hole and the other one of the second ventilation hole, thereby ensuring the directional flow of the airflow, avoiding airflow chaos, and forming an efficient heat dissipation circulation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the structure of the compact motor in the utility model;

[0026] Figure 2 It is a schematic structural diagram of another perspective of the compact motor in the utility model;

[0027] Figure 3 It is a cross-sectional view of the motor with a compact structure in the utility model;

[0028] Figure 4 It is a schematic diagram of the local structure of the compact motor in the utility model;

[0029] Figure 5 It is an enlarged view of the local structure of the compact motor in the utility model;

[0030] Figure 6 An exploded view of the compact motor in the utility model;

[0031] Figure 7 This is a schematic diagram of the structure of the fan in the utility model;

[0032] In the figure, 100, shell; 101, front cover; 1011, first ventilation hole; 102, rear cover; 1021, second ventilation hole; 103, avoidance gap; 104, air inlet gap; 110, stator; 121, rotating shaft; 1211, output end; 122, magnetic core; 1221, magnetic groove; 123, bushing; 124, commutator; 130, fan; 131, fixing ring; 132, fan blade; 1321, windward surface; 133, fixing rib; 134, ventilation duct; 140, circuit board. DETAILED DESCRIPTION

[0033] The utility model discloses a motor with compact structure, comprising a shell, a stator and a rotor, wherein the stator is fixed on the inner wall of the shell and is located on the radial side of the rotor, the rotor comprises a rotating shaft, a magnetic core fixedly sleeved on the rotating shaft, a shaft sleeve and a commutator, and a rotor winding wound on the magnetic core, the shaft sleeve is located between the magnetic core and the commutator, a ventilation hole is provided on the shell, a fan is provided between the magnetic core and the commutator, and the fan is fixed on the magnetic core and is located on the radial side of the shaft sleeve.

[0034] Firstly, the fan is located between the magnetic core and the commutator, so that the magnetic core and the commutator are both arranged closer to the fan, which is conducive to the airflow generated by the fan directly acting on the commutator and the magnetic core, quickly taking away the heat, effectively preventing overheating, and protecting the electrical performance and service life of the commutator and the magnetic core. It can also effectively utilize the space between the magnetic core and the commutator, and does not occupy additional side space to install the fan, which is conducive to the compact design of the motor. Secondly, the fan is fixed on the magnetic core and is located on the radial side of the sleeve. Compared with the prior art where the fan is arranged on the axial side of the sleeve, there is no need to increase the axial size of the motor, making the structure of the motor more compact.

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0036] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0037] It should be understood that in various embodiments of the present invention, the size of the serial number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0038] It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0039] It should be understood that in the present utility model, "plurality" refers to two or more than two. "And / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or any three of X, Y, and Z are included.

[0040] The following specific embodiments are used to describe the technical solution of the utility model in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0041] like Figures 1 to 7As shown, the utility model provides a motor with a compact structure, including a housing 100, a stator 110 and a rotor, wherein the stator 110 is fixed on the inner wall of the housing 100 and is located on the radial side of the rotor, the rotor includes a rotating shaft 121, a magnetic core 122 fixedly sleeved on the rotating shaft 121, a shaft sleeve 123 and a commutator 124, and a rotor winding wound on the magnetic core 122, the shaft sleeve 123 is located between the magnetic core 122 and the commutator 124, a ventilation hole is provided on the housing 100, and a fan 130 is provided between the magnetic core 122 and the commutator 124, so that the magnetic core 122 and the commutator 124 are closer to each other. The arrangement near the fan 130 is beneficial for the airflow generated by the fan 130 to directly act on the commutator 124 or the magnetic core 122, quickly taking away the heat, effectively preventing overheating, protecting the electrical performance and service life of the commutator 124 and the magnetic core 122, and also effectively utilizing the space between the magnetic core 122 and the commutator 124, which is beneficial to the compact design of the motor. Secondly, the fan 130 is fixed on the magnetic core 122 and sleeved on the outside of the shaft sleeve 123. Compared with the prior art in which the fan 130 is arranged on the axial side of the shaft sleeve 123, the axial dimension of the rotating shaft 121 is effectively shortened, making the structure of the motor more compact.

[0042] Among them, the motor is also provided with a circuit board 140. If the temperature of the circuit board 140 is too high, it will affect the normal operation of the motor. For this reason, in this embodiment, the circuit board 140 is located on the side close to the commutator 124 and away from the fan 130, which helps to reduce the overall size of the motor and meet the needs of miniaturization and lightweight design. It also avoids the high-speed running fan 130 from contacting the leads on the circuit board 140, thereby improving safety. Secondly, the airflow generated by the fan 130 can also dissipate heat for the circuit board 140, and can also greatly shorten the length of the connection between the electronic components and the commutator 124, making the internal wiring of the motor more reasonable.

[0043] Specifically, the housing 100 includes a front cover 101 located at one side of the output end 1211 of the motor and a rear cover 102 arranged opposite to the front cover 101. In order to avoid airflow chaos, the ventilation holes include a first ventilation hole 1011 and a second ventilation hole 1021 arranged opposite to the first ventilation hole 1011. The first ventilation hole 1011 is arranged on the front cover 101, and the second ventilation hole 1021 is arranged on the rear cover 102. The first ventilation hole 1011 is arranged toward the commutator 124, and the second ventilation hole 1021 is arranged toward the magnetic core 122. The fan 130 is located between the first ventilation hole 1011 and the second ventilation hole 1021. For the convenience of distinction, when the motor rotates forward, the fan 130 inhales fresh air through the first ventilation hole 1011, and the air passes through the commutator 124 and blows toward the key heat-generating components such as the magnetic core 122. Then, the hot air is discharged to the outside of the motor through the second ventilation hole 1021, which ensures the directional flow of the airflow, avoids airflow chaos, and forms an efficient heat dissipation circulation system. When the motor reverses, the fan 130 draws in fresh air through the second ventilation hole 1021. The air passes through the commutator 124 and blows toward key heat-generating components such as the magnetic core 122. The hot air is then discharged to the outside of the motor through the first ventilation hole 1011, ensuring directional flow of the airflow, avoiding airflow chaos, and forming an efficient heat dissipation circulation system.

[0044] It should be noted that there can be multiple first ventilation holes 1011 and multiple second ventilation holes 1021. The multiple first ventilation holes 1011 are evenly spaced along the circumferential direction of the front end cover 101, and the multiple second ventilation holes 1021 are evenly spaced along the circumferential direction of the rear end cover 102, so that the airflow entering or exhausting the motor is more stable.

[0045] Preferably, the commutator 124 is located on the side close to the motor output end 1211, and the fan 130 is located on the side close to the motor output end 1211, which can optimize the internal space layout of the motor and make the motor design more compact. It also allows easier access to the fan 130 and the commutator 124 when performing motor maintenance or cleaning, thereby facilitating daily maintenance and troubleshooting.

[0046] In addition, the magnetic core 122 is provided with a magnetic groove 1221, and the fan 130 includes a fixing ring 131, a fan blade 132 and a fixing rib 133. The fixing ring 131 is located on the radial side of the sleeve 123 and is spaced apart from the sleeve 123, which not only ensures the effective operating space of the fan 130, but also avoids direct contact with the sleeve 123, reduces unnecessary friction and wear, and at the same time, this layout realizes the maximum integration of functions in a limited motor space. Secondly, the fixing rib 133 is arranged on the fixing ring 131 along the axial direction of the rotating shaft 121, and the fan blade 132 is inserted into the magnetic groove 1221 of the rotor through the fixing rib 133 for plugging and fixing, which simplifies the installation process of the fan 130, does not require a complex fixing structure, and also facilitates subsequent maintenance and replacement. Finally, the fan blade 132 is arranged on the fixing ring 131 along the radial direction of the rotating shaft 121, which can increase the airflow coverage area output by the fan 130 and further enhance the heat dissipation effect on the magnetic core 122 and the commutator 124.

[0047] In order to improve the stability of the airflow, a plurality of fan blades 132 are provided, and the plurality of fan blades 132 are arranged at intervals along the circumference of the fixing ring 131, and a ventilation duct 134 is formed between two adjacent fan blades 132, which can cut the air more evenly, form a continuous and stable airflow, and improve the uniformity and stability of the wind output. Secondly, the fixing ribs 133 extend into the ventilation duct 134 and are arranged to be raised relative to the surface of the fixing ring 131, which can increase the turbulence of the airflow and effectively increase the wind pressure, so that the fan 130 can output a larger air volume at the same rotation speed, or achieve the same heat dissipation effect at a lower rotation speed.

[0048] Among them, the axial dimension of the fan blade 132 is D1, and the axial dimension of the fixing ring 131 is D2. If D1<D2, the fixing ring 131 will occupy a larger space in the axial direction. For a motor with limited space, the size of the motor needs to be increased to meet the installation of the fixing ring 131, resulting in a larger volume of the motor, and the axial dimension of the fan blade 132 is smaller, and the output air volume is also smaller. In order to further reduce the axial dimension of the motor, in this embodiment, D1≥D2. Reasonable setting of the size of the fan blade 132 can not only ensure that the fixing ring 131 plays an effective supporting role for the fan blade 132, but also reduce the axial dimension of the fixing ring 131 as much as possible, thereby reducing the fixed ring 131 The occupation of the internal space of the motor, making the structure of the motor more compact, and also increasing the air volume.

[0049] In order to install the fan 130, the radial dimension of the motor needs to be increased. In this embodiment, the maximum radial dimension of the fan blade 132 is D3, the radial dimension of the magnetic core 122 is D4, and the radial dimension of the stator 110 is D5, D4<D3≤D5, the maximum radial dimension D3 of the fan blade 132 is greater than the radial dimension D4 of the magnetic core 122, and the fan blade 132 can completely cover and even exceed the outer edge of the magnetic core 122, and can also dissipate heat for the outer edge of the magnetic core 122, which can effectively dissipate heat for the magnetic core 122. The maximum radial dimension D3 of the blade 132 is less than or equal to the radial dimension D4 of the magnetic core 122. The fan blade 132 may not be able to completely cover the magnetic core 122, resulting in the uncovered portion of the magnetic core 122 not being able to effectively dissipate heat. Secondly, the maximum radial dimension D3 of the fan blade 132 is smaller than the radial dimension of the stator 110, so there is no need to increase the radial dimension of the motor, making the size of the motor more compact. If the maximum radial dimension D3 of the fan blade 132 is greater than or equal to the radial dimension of the stator 110, it is necessary to increase the radial dimension of the motor, thereby increasing the size of the motor.

[0050] Furthermore, there is an air inlet gap 104 between the fan blade 132 and the magnetic core 122, which ensures that air can flow smoothly into the magnetic core 122, directly acting on the heating area of ​​the magnetic core 122, especially dissipating heat for the rotor winding wound on the magnetic core 122, thereby improving the heat dissipation efficiency. At the same time, the axial dimension of the stator 110 is larger than the axial dimension of the magnetic core 122 so that the stator 110 is protruded relative to both ends of the magnetic core 122, and there is an avoidance gap 103 between the fan blade 132 and the stator 110. The avoidance gap 103 prevents the fan blade 132 from contacting the stator 110 when rotating, thereby reducing wind resistance, facilitating smooth airflow, further optimizing heat dissipation performance, and also preventing the fan blade 132 from colliding or rubbing with the stator 110 when rotating at high speed.

[0051] If the windward surface 1321 of the fan blade 132 is a plane, the interaction between its edge and the air may cause greater aerodynamic noise, and the windward surface 1321 may cause airflow separation, reducing ventilation or cooling efficiency. For this reason, in this embodiment, the windward surface 1321 of the fan blade 132 is a curved surface. The curved surface design can enable the fan blade 132 to capture and accelerate air more effectively when rotating. Compared with the flat fan blade 132, the curved surface can guide the airflow more smoothly and reduce the separation phenomenon, thereby generating greater wind pressure and air volume at the same speed, improving ventilation or cooling efficiency. Secondly, the windward surface 1321 is inclined relative to the axial cross-section of the fixing ring 131. The inclined setting of the windward surface 1321 helps the airflow to smoothly transition along the surface of the fan blade 132, reducing the turbulence and noise generated by the airflow separation point, and can improve the dynamic characteristics of the airflow around the fan blade 132, so that the airflow noise is reduced, and the fan 130 runs more quietly.

[0052] It can be understood that in other embodiments, the commutator is located on a side away from the motor output end, and the fan is located on a side away from the motor output end, which can reduce the direct inhalation of impurities into the fan when the motor output end is running.

[0053] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A compact motor, comprising a housing, a stator and a rotor, wherein the stator is fixed to the inner wall of the housing and is located on the radial side of the rotor, the rotor comprises a rotating shaft, a magnetic core fixedly sleeved on the rotating shaft, a sleeve and a commutator, and a rotor winding wound on the magnetic core, wherein the sleeve is located between the magnetic core and the commutator, characterized in that: The shell is provided with ventilation holes, a fan is provided between the magnetic core and the commutator, and the fan is fixed on the magnetic core and sleeved outside the shaft sleeve.

2. The compact motor according to claim 1, characterized in that The commutator is located on a side close to the output end of the motor, and the fan is located on a side close to the output end of the motor.

3. The compact motor according to claim 1, characterized in that: The magnetic core is provided with a magnetic groove, and the fan includes a fixing ring, a fan blade and a fixing rib. The fixing ring is located on the radial side of the sleeve and is spaced apart from the sleeve. The fan blade is arranged on the fixing ring along the radial direction of the rotating shaft. The fixing rib is arranged on the fixing ring along the axial direction of the rotating shaft. The fan blade is inserted into the magnetic groove through the fixing rib and fixed.

4. The compact motor according to claim 3, characterized in that The axial dimension of the fan blade is D1, the axial dimension of the fixing ring is D2, and D1≥D2.

5. The compact motor according to claim 3, characterized in that: The maximum radial dimension of the fan blade is D3, the radial dimension of the magnetic core is D4, the radial dimension of the stator is D5, and D4<D3≤D5.

6. The compact motor according to claim 3, characterized in that: The axial dimension of the stator is larger than the axial dimension of the magnetic core so that the stator is protruded relative to the two ends of the magnetic core. There is an avoidance gap between the fan blade and the stator, and there is an air inlet gap between the fan blade and the magnetic core.

7. The compact motor according to claim 3, characterized in that: The windward surface of the fan blade is a curved surface, and the windward surface is inclined relative to the axial cross section of the fixing ring.

8. The compact motor according to claim 3, characterized in that: There are a plurality of fan blades, which are spaced apart along the circumference of the fixing ring, and a ventilation duct is formed between two adjacent fan blades. The fixing ribs extend into the ventilation duct and are protruded relative to the surface of the fixing ring.

9. The compact electric machine according to claim 1, characterized in that: The motor further comprises a circuit board, and the circuit board is located close to a side of the commutator away from the fan.

10. The compact electric machine according to claim 1, characterized in that The ventilation holes include a first ventilation hole and a second ventilation hole arranged opposite to the first ventilation hole, the first ventilation hole is arranged toward the commutator, the second ventilation hole is arranged toward the magnetic core, and the fan is located between the first ventilation hole and the second ventilation hole.

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