CN-122001156-A - Centrifugal radiating ultrathin brushless direct current motor

Abstract

The invention discloses a centrifugal heat-dissipation ultrathin brushless direct current motor, which comprises a stator assembly and a rotor assembly rotatably arranged in the stator assembly, wherein a closed annular cavity is formed in the rotor assembly, and a phase change working medium is filled in the cavity and is provided with a capillary structure. According to the invention, when the motor operates, centrifugal force generated by high-speed rotation of the rotor drives working medium in the cavity to perform cyclic phase change, so that the heat of the rotor is efficiently transferred to the periphery of the rotor, and the inner side of the end cover is provided with static radiating fins which are thermally coupled with the outer surface of the rotor through a tiny axial air gap, so that the final heat dissipation is completed. The invention completely embeds the heat radiation system in the rotor, cancels all external heat radiation components, realizes structural integration, high-efficiency heat radiation, reliable sealing and silence operation, and ensures that the working medium circulation is guided by centrifugal force and assisted by capillary force, so that the motor can maintain consistent heat radiation performance under various spatial postures, and is particularly suitable for the motor driving field with higher requirements on space and reliability.

Inventors

• ZHU ZHONGJIE
• GU XUEMING
• ZHANG YAO
• CHEN YUNFENG
• WANG JIE

Assignees

• 京马电机有限公司

Dates

Publication Date

20260508

Application Date

20260410

Claims (10)

1. 1. The centrifugal heat-dissipation ultrathin brushless direct current motor is characterized by comprising a rotor assembly (1), a stator assembly (2), a shell assembly (3) and a shafting assembly (4); The rotor assembly (1) is rotationally arranged in the stator assembly (2), the rotor assembly (1) comprises a rotor base body (101) and permanent magnets (102) arranged on the rotor base body (101), the stator assembly (2) comprises a stator iron core (201) and windings (202), at least one airtight cavity (103) is formed in the rotor base body (101), a phase change working medium is filled in the cavity (103), and the rotor assembly (1) is configured to drive the phase change working medium to circulate in the cavity (103) by utilizing centrifugal force and conduct phase change when rotating, so that heat on the rotor base body (101) is transferred to the periphery of the cavity.
2. 2. A centrifugal heat dissipating ultra-thin brushless DC motor as defined in claim 1, wherein the cavity (103) is an annular cavity surrounding the axis of rotation of the rotor assembly (1).
3. 3. A centrifugal heat-dissipating ultra-thin brushless DC motor as set forth in claim 2, wherein the inner wall surface of said cavity (103) is provided with a capillary structure (104) at least in a region near the rotation axis.
4. 4. A centrifugal heat dissipating ultra-thin brushless DC motor as set forth in claim 3, wherein said wicking structure (104) is a sintered metal powder layer, wire mesh or micro-groove structure.
5. 5. A centrifugal heat-dissipating ultra-thin brushless DC motor as set forth in claim 1, wherein said rotor base (101) comprises an inner housing (105) and an outer housing (106) fixedly connected coaxially, said cavity (103) being formed between said inner housing (105) and said outer housing (106).
6. 6. A centrifugal heat dissipating ultra-thin brushless DC motor as set forth in claim 5, wherein said inner housing (105) has a thermal conductivity greater than a thermal conductivity of said outer housing (106).
7. 7. A centrifugal heat-dissipating ultra-thin brushless DC motor as set forth in claim 1 wherein said housing assembly (3) comprises a motor housing (301), a first end cap (302) and a second end cap (303), heat-dissipating fins (304) being provided on the inner sides of said first end cap (302) and said second end cap (303), said heat-dissipating fins (304) being disposed in axial correspondence with the outer peripheral surface of said rotor assembly (1) with an axial gap therebetween.
8. 8. The ultra-thin brushless DC motor with centrifugal heat dissipation as set forth in claim 7, wherein heat dissipation holes (305) are formed in the first end cover (302) and the second end cover (303).
9. 9. The ultra-thin brushless direct current motor with centrifugal heat dissipation as set forth in claim 1, wherein the phase change working medium has a boiling point of 50-150 ℃.
10. 10. A centrifugal heat dissipating ultra-thin brushless DC motor as set forth in claim 1 wherein said shafting assembly (4) comprises a shaft (401), a first bearing (402) and a second bearing (403), said rotor assembly (1) being secured to said shaft (401), said shaft (401) being rotatably supported by said first bearing (402) and second bearing (403).

Description

Centrifugal radiating ultrathin brushless direct current motor Technical Field The invention relates to the technical field of motors, in particular to a centrifugal heat dissipation ultrathin brushless direct current motor. Background With the rapid development of the fields of precision instruments, medical equipment, micro robots and the like, nearly new requirements are put on the thickness and performance of a core driving component, namely a direct current brushless motor, namely the direct current brushless motor, which not only needs an ultrathin structure, but also needs to have high power density and long-term operation reliability, and heat generated in the operation of the motor is difficult to dissipate in a compact space, so that the requirements on the performance and the service life of the motor are become main bottlenecks. In order to solve the heat dissipation problem, the industry tries to introduce a phase change cooling technology into a motor design, the prior art discloses a 'stator-rotor hybrid evaporative cooling motor structure' of the Chinese utility model with the authority of publication number CN114337113B, the scheme stores a cooling working medium at the bottom of a motor shell, and utilizes an independent liquid throwing component on a rotating shaft to centrifugally splash the working medium to the end part of a stator for cooling, although the design simultaneously cools the stator and a rotor, the design depends on a complex liquid throwing disc, a liquid suction material and a multistage shaft seal system, and a separate bottom liquid storage cavity is needed, the design structure is complex, in addition, the working medium circularly depends on gravity backflow, the reliability is poor in the application with changeable equipment postures, the Chinese utility model with the authority of publication number CN218920181U discloses a 'miniature motor with strong heat dissipation property', the scheme statically fills the phase change working medium in a strip-shaped micro groove of a motor shell, and is assisted with an axial flow fan blade for air cooling, the phase change working medium is sealed in a static groove, effective circulation cannot be formed, only the phase change is capable of being passively heated through heat conduction, the latent heat is not fully utilized, the efficient advantage of latent heat is still mainly exerted, the heat dissipation efficiency is still depends on the traditional fan blade, and the axial space occupation is also occupied by the axial direction heat dissipation system. Therefore, there is an urgent need for an ultra-thin motor solution that can deeply integrate the heat dissipation function with the motor power components, and achieve efficient and reliable heat dissipation without adding any additional axial space. Disclosure of Invention The invention aims to provide a centrifugal heat-dissipation ultrathin brushless direct current motor so as to solve the problems in the background art. In order to achieve the above purpose, the present invention provides the following technical solutions: A centrifugal heat-dissipating ultrathin brushless direct current motor comprises a rotor assembly, a stator assembly, a shell assembly and a shafting assembly; The rotor assembly is rotationally arranged in the stator assembly and comprises a rotor matrix and permanent magnets arranged on the rotor matrix, wherein the stator assembly comprises a stator core and a winding; The rotor assembly is configured to drive the phase change working medium to circulate in the cavity by centrifugal force and generate phase change when rotating, and transfer heat on the rotor matrix to the periphery of the rotor matrix. Preferably, the cavity is an annular cavity surrounding the axis of rotation of the rotor assembly. Preferably, the inner wall surface of the cavity is provided with a capillary structure at least in a region near the rotation axis. Preferably, the capillary structure is a sintered metal powder layer, a wire mesh or a micro-groove structure. Preferably, the rotor matrix comprises an inner shell and an outer shell which are coaxially and fixedly connected, and the cavity is formed between the inner shell and the outer shell. Preferably, the thermal conductivity of the inner shell is greater than the thermal conductivity of the outer shell. Preferably, the housing assembly comprises a motor housing, a first end cover and a second end cover, wherein radiating fins are arranged on the inner sides of the first end cover and the second end cover, and are arranged corresponding to the outer peripheral surface of the rotor assembly in the axial direction with an axial gap between the radiating fins. Preferably, the first end cover and the second end cover are provided with heat dissipation holes. Preferably, the boiling point of the phase change working medium is between 50 ℃ and 150 ℃. Preferably, the shaft system comprises a rotating shaft, a f