Miniature motor with active heat dissipation structure

Abstract

The utility model belongs to the technical field of small-sized motors, and particularly relates to a small-sized motor with an active heat dissipation structure. A small motor with an active heat dissipation structure comprises a motor upper shell, a motor lower shell and a rotor and stator combination, the motor upper shell and the motor lower shell are fixed in an up-down covering mode, and the rotor and stator combination is located in the motor upper shell and the motor lower shell; the rotor and stator combination comprises a rotor and a stator, and the rotor and the stator are combined in a non-contact nesting mode. The stator is fixedly embedded into the motor upper shell; the rotor comprises a rotor cell and a transmission shaft, and the transmission shaft penetrates through the rotor cell to be fixed; the upper half section of the transmission shaft penetrates through the motor upper shell, the transmission shaft is rotationally connected with the motor upper shell, the transmission shaft penetrates through the motor lower shell, and the transmission shaft is rotationally connected with the motor lower shell; an air inlet is formed in the top of the upper motor shell, a heat dissipation grid is arranged at the bottom of the lower motor shell, and heat dissipation fan blades are arranged on the transmission shaft and fixedly connected with the transmission shaft support.

Description

Technical Field

[0001] This utility model belongs to the field of small motor technology, specifically relating to a small motor with an active heat dissipation structure. Background Technology

[0002] Small motors typically refer to a type of motor with relatively low power and a compact size. The working principle of small motors is based on electromagnetic principles. Current flowing through the windings generates a magnetic field, and the rotor rotates under the influence of this magnetic field. High-efficiency operation can be achieved by increasing the power supply frequency or optimizing the motor structure (such as using high-quality magnetic materials and an optimized cooling system). Due to their high efficiency, compactness, and high performance, small motors have shown broad application prospects in many fields, including industrial automation, medical devices, aerospace, consumer electronics, and scientific research equipment.

[0003] The development trends of small motors are mainly reflected in the following aspects: high efficiency and energy saving, intelligence and digitalization, miniaturization and high power density. The prerequisite for miniaturization and high power density development lies in the continuous improvement of cooling technology for small motors. Due to the compact internal space of small motors, it is difficult to install a separate cooling device inside the motor; therefore, a passive cooling method with cooling fins on the motor casing is typically used.

[0004] In order to enhance the cooling efficiency of small motors, this invention aims to provide a small motor with an active heat dissipation structure. Utility Model Content

[0005] The purpose of this invention is to provide a small motor with an active heat dissipation structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A small motor with an active heat dissipation structure includes an upper motor housing, a lower motor housing, and a rotor-stator assembly. The upper and lower motor housings are fixed together by overlapping, and the rotor-stator assembly is located inside the upper and lower motor housings.

[0008] The rotor-stator assembly includes a rotor and a stator, which are assembled in a non-contact nested manner; the stator is fixedly embedded in the upper housing of the motor; the rotor includes a rotor cell and a drive shaft, the drive shaft passing through the rotor cell for fixation; the upper half of the drive shaft passes through the upper housing of the motor, and the drive shaft is rotatably connected to the upper housing of the motor; the lower half of the drive shaft passes through the lower housing of the motor, and the drive shaft is rotatably connected to the lower housing of the motor.

[0009] The top of the upper housing of the motor is provided with an air inlet, the bottom of the lower housing of the motor is provided with a heat dissipation grille, the lower half of the drive shaft is provided with heat dissipation fan blades, and the heat dissipation fan blades are fixedly connected to the drive shaft bracket.

[0010] Preferably, a first rotating bearing is provided at the rotatable connection between the drive shaft and the upper housing of the motor, and a second rotating bearing is provided at the rotatable connection between the drive shaft and the lower housing of the motor.

[0011] Preferably, the motor housing has a stator support inside, the stator support being rotatably connected to the drive shaft, and a support bearing being provided at the rotatable connection between the stator support and the drive shaft.

[0012] Preferably, the lower housing of the motor is provided with a second stator support, which is rotatably connected to the drive shaft, and a second support bearing is provided at the rotatable connection between the second stator support and the drive shaft.

[0013] Preferably, the lower housing of the motor includes a housing body and a housing bottom, which are fixed together; the second stator support is located inside the housing body, and the cooling fan blades are located inside the housing bottom; the drive shaft passes through the second stator support and the cooling fan blades in sequence.

[0014] Preferably, the rotor cell is provided with several heat dissipation fins at both the top and bottom.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] (1) The present invention provides a small motor with an active heat dissipation structure. A heat dissipation fan blade is provided at the bottom of the small motor. The heat dissipation fan blade is fixed on the drive shaft of the stator and the fixed fan blade rotates synchronously with the stator. When the stator rotates faster, the power density is also larger. Correspondingly, the faster the heat dissipation fan blade rotates, the better the heat dissipation effect can be achieved.

[0017] (2) The present invention provides a small motor with an active heat dissipation structure, which has an air inlet at the top of the upper housing of the motor and a heat dissipation grille at the bottom of the lower housing of the motor. The cooling airflow passes through the rotor-stator assembly quickly in a straight flow manner, which effectively improves the heat dissipation effect.

[0018] (3) The present invention provides a small motor with an active heat dissipation structure, wherein the top and bottom of the motor rotor are provided with heat dissipation fins. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 For the explosion of this utility model Figure 1 ;

[0021] Figure 3 For the explosion of this utility model Figure 2 ;

[0022] In the diagram: 1. Upper casing of motor; 2. Lower casing of motor; 3. Rotor-stator assembly; 4. Rotor; 5. Stator; 6. Rotor cell; 7. Drive shaft; 8. Rotary bearing 1; 9. Rotary bearing 2; 10. Stator bracket 1; 11. Bracket bearing 1; 12. Stator bracket 2; 13. Support bearing 2; 14. Air inlet; 15. Heat dissipation grille; 16. Heat dissipation fan blades; 17. Housing body; 18. Housing bottom; 19. Heat dissipation fins. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] A small motor with an active heat dissipation structure includes an upper motor housing 1, a lower motor housing 2, and a rotor-stator assembly 3. The upper motor housing 1 and the lower motor housing 2 are fixed together, and the rotor-stator assembly 3 is located inside the upper motor housing 1 and the lower motor housing 2. The rotor-stator assembly 3 includes a rotor 4 and a stator 5, which are assembled in a non-contact nested manner. The stator 5 is fixedly embedded in the upper motor housing 1. The rotor 4 includes a rotor core 6 and a drive shaft 7, which passes through the rotor core 6 and is fixed thereto. The upper half of the drive shaft 7 passes through the upper motor housing 1, and the drive shaft 7 is rotatably connected to the upper motor housing 1. A first rotary bearing 8 is provided at the rotatable connection between the drive shaft 7 and the upper motor housing 1. The lower half of the drive shaft 7 passes through the lower motor housing 2, and the drive shaft 7 is rotatably connected to the lower motor housing 2. A second rotary bearing 9 is provided at the rotatable connection between the drive shaft 7 and the lower motor housing 2. To improve the rotational stability of rotor 4, a stator support 10 is provided inside the upper housing 1 of the motor. The stator support 10 and the drive shaft 7 are rotatably connected. A support bearing 11 is provided at the rotatable connection between the stator support 10 and the drive shaft 7. A stator support 22 is provided inside the lower housing 2 of the motor. The stator support 22 and the drive shaft 7 are rotatably connected. A support bearing 23 is provided at the rotatable connection between the stator support 22 and the drive shaft 7.

[0025] To enhance the gas flow efficiency inside the small motor, an air inlet 14 is provided at the top of the upper outer casing 1, and a heat dissipation grille 15 is provided at the bottom of the lower outer casing 2. A cooling fan blade 16 is provided on the lower half of the drive shaft 7, and the cooling fan blade 16 is fixedly connected to the drive shaft 7, allowing it to rotate synchronously with the drive shaft 7. The lower outer casing 2 includes a body 17 and a bottom 18. A stator support 12 is located at the body 17, and the body 17 and bottom 18 are fitted together and fixed. The cooling fan blade 16 is located inside the bottom 18, and the drive shaft 7 passes through the stator support 12 and the cooling fan blade 16 in sequence.

[0026] As the drive shaft 7 rotates, the cooling fan blades 16 expel the gas from the bottom of the small motor, thereby drawing air from inside the motor. An air inlet 14 is located at the top of the upper casing 1, and a cooling grille 15 is located at the bottom of the lower casing 2. The cooling airflow passes quickly through the rotor-stator assembly 3 in a straight line, effectively improving heat dissipation. To further enhance cooling, cooling fins 19 are provided at both the top and bottom of the rotor cell 6.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A small motor with an active heat dissipation structure, characterized in that: It includes an upper motor housing, a lower motor housing, and a rotor-stator assembly. The upper and lower motor housings are fixed together by overlapping, and the rotor-stator assembly is located inside the upper and lower motor housings. The rotor-stator assembly includes a rotor and a stator, which are assembled in a non-contact nested manner; the stator is fixedly embedded in the upper housing of the motor; the rotor includes a rotor cell and a drive shaft, the drive shaft passing through the rotor cell for fixation; the upper half of the drive shaft passes through the upper housing of the motor, and the drive shaft is rotatably connected to the upper housing of the motor; the lower half of the drive shaft passes through the lower housing of the motor, and the drive shaft is rotatably connected to the lower housing of the motor. The top of the upper housing of the motor is provided with an air inlet, the bottom of the lower housing of the motor is provided with a heat dissipation grille, the lower half of the drive shaft is provided with heat dissipation fan blades, and the heat dissipation fan blades are fixedly connected to the drive shaft bracket.

2. A small motor with an active heat dissipation structure according to claim 1, characterized in that: A first rotating bearing is provided at the rotatable connection between the drive shaft and the upper housing of the motor, and a second rotating bearing is provided at the rotatable connection between the drive shaft and the lower housing of the motor.

3. A small motor with an active heat dissipation structure according to claim 1, characterized in that: The motor housing has a stator support inside, which is rotatably connected to the drive shaft. A support bearing is provided at the rotatable connection between the stator support and the drive shaft.

4. A small motor with an active heat dissipation structure according to claim 1, characterized in that: The lower housing of the motor is provided with a stator support two inside, the stator support two is rotatably connected to the drive shaft, and a support bearing two is provided at the rotatable connection between the stator support two and the drive shaft.

5. A small motor with an active heat dissipation structure according to claim 4, characterized in that: The lower housing of the motor includes a housing body and a housing bottom, which are fixed together by covering each other; the second stator support is located inside the housing body, and the cooling fan blades are located inside the housing bottom; the drive shaft passes through the second stator support and the cooling fan blades in sequence.

6. A small motor with an active heat dissipation structure according to claim 1, characterized in that: The rotor cell has several heat dissipation fins at both the top and bottom.

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