CN-122001152-A - Alternating current motor with high-efficient heat radiation structure

CN122001152ACN 122001152 ACN122001152 ACN 122001152ACN-122001152-A

Abstract

The invention discloses an alternating current motor with a high-efficiency heat dissipation structure, and aims to solve the problem of heat dissipation bottleneck caused by a narrow air gap and a thermal boundary layer effect in a compact closed environment of a traditional alternating current motor. The invention aims at providing an alternating current motor with a high-efficiency heat dissipation structure, and the system comprises an airflow excitation unit and an airflow directional conveying unit which are driven by rotor kinetic energy. The air flow directional conveying unit is used for efficiently conveying compressed air to an air gap area through a multi-stage supercharging structure, a spiral flow guiding structure and a self-adaptive air guiding structure. The system realizes active damage and enhanced heat exchange of the thermal boundary layer in the air gap on the premise of not increasing the air gap and not depending on external forced air cooling, remarkably improves the heat dissipation efficiency and the operation reliability of the motor, and is particularly suitable for application scenes such as washing machines and the like with limited space and frequent forward and reverse rotation.

Inventors

ZHANG XIAOBIN
GU XUEMING
Shen Juliang
ZHENG ZHANGFENG
CHEN YUNFENG

Assignees

京马电机有限公司

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (10)

1. An alternating current motor with a high-efficiency heat dissipation structure comprises a stator assembly (100), a rotor assembly (200) and an end cover (400), wherein an air gap (300) is arranged between the stator assembly (100) and the rotor assembly (200), and the alternating current motor is characterized by further comprising an active heat dissipation system integrated in the motor; The active heat dissipation system includes: An air flow excitation unit (500) for generating periodic air pressure pulsation by using rotational kinetic energy of the rotor assembly (200); An air flow directional delivery unit (600) receives and converts the air pressure pulsation to a directional high pressure cooling air flow and delivers the high pressure cooling air flow to at least one inlet region of the air gap (300) to enhance air flow within the air gap and break up thermal boundary layers.
2. The alternating current motor with a high-efficiency heat dissipation structure as set forth in claim 1, wherein said air flow excitation unit (500) comprises: a driving part (510) synchronously rotating with the rotor assembly (200) and provided with at least one first magnetic action part (512); A response portion (520) fixed to the end cap (400) or the stator assembly (100) and disposed axially opposite the drive portion (510); And an elastic deformation part (530) connected to the response part (520) to form a chamber and provided with a second magnetic action part (531) which interacts with the first magnetic action part (512), wherein the elastic deformation part (530) can generate axial reciprocating deformation under the action of periodically changing magnetic force between the first magnetic action part (512) and the second magnetic action part (531), thereby generating the air pressure pulsation in the chamber.
3. The alternating current motor with the efficient heat dissipation structure as set forth in claim 2, wherein the air flow directional conveying unit (600) comprises an air flow compression pressurization structure (610), the air flow compression pressurization structure (610) is arranged in the response part (520) and comprises at least two compression chambers (611) which are sequentially arranged along the air flow conveying direction and gradually reduced in volume, a first one-way valve (615) allowing air flow to pass through unidirectionally is arranged between every two adjacent compression chambers, and the air pressure pulsation drives the air flow to sequentially pass through the compression chambers to realize gradual pressurization, so that the high-pressure cooling air flow is formed.
4. The alternating current motor with efficient heat dissipation structure as recited in claim 3, wherein the air flow directional transportation unit (600) further comprises an air flow guiding structure (620), the air flow guiding structure (620) being connected to an outlet of the air flow compressing and pressurizing structure (610) for guiding the high pressure cooling air flow to an inlet area of the air gap (300).
5. The alternating current motor with efficient heat dissipation structure as recited in claim 4, wherein the air flow guiding structure (620) comprises: A guide tube (621) having an inlet in communication with an outlet of the air flow compression plenum (610), the outlet extending to the air gap (300) inlet; The inner flow passage of the guide tube (621) is configured to impart a rotational component of motion to the air flow passing therethrough.
6. The alternating current motor with the efficient heat dissipation structure as recited in claim 5, wherein a spiral guide vane (622) is arranged inside the guide pipe (621) and is used for enabling airflow to generate rotational flow, and the rotational direction of the rotational flow is the same as the preset rotational direction of the rotor assembly (200).
7. The alternating current motor with a high efficiency heat dissipating structure as set forth in claim 2, wherein the first magnetic acting portion (512) of the driving portion (510) comprises at least one set of permanent magnets alternately arranged in polarity to generate alternate repulsive and attractive forces to the second magnetic acting portion (531) during rotation to drive the elastic deformation portion (530) to reciprocate.
8. The alternating current motor with efficient heat dissipation structure as recited in claim 1, further comprising an adaptive air guide structure (700) disposed on an end surface of the rotor assembly (200) facing the air gap (300) inlet for effectively guiding the cooling air flow from the air flow directional delivery unit (600) into the air gap (300) when the motor is rotating forward or backward.
9. The alternating current motor with efficient heat dissipation structure as recited in claim 8, wherein the adaptive air guiding structure (700) comprises a plurality of V-shaped air guiding blade groups (710) which are arranged in a circumferential direction, each V-shaped air guiding blade group (710) is composed of two blades which are arranged in a V shape, and an opening of the V shape faces away from a rotation center of the rotor assembly (200) and faces to an inlet of the air gap (300).
10. The alternating current motor with efficient heat dissipation structure as recited in claim 9, further comprising an air flow restraining structure (800), wherein the air flow restraining structure (800) is fixed on the stator assembly (100) and is disposed around the adaptive air guiding structure (700) for converging air flow guided out of the adaptive air guiding structure (700) and reducing dissipation of the air flow out of an air gap.

Description

Alternating current motor with high-efficient heat radiation structure Technical Field The invention relates to the field of motors, in particular to an alternating current motor with an efficient heat dissipation structure. Background Ac motor, especially squirrel cage induction motor, is widely used as driving core in household appliances such as washing machine due to its advantages of simple structure, low cost, reliable operation, etc. However, the motor of the washing machine works for a long time in a closed, moist and poorly ventilated cavity, the heat dissipation conditions of which are extremely bad. If a large amount of heat (mainly copper loss of a stator winding and iron loss of an iron core) generated in the processes of frequent start-stop, full-load operation and forward and reverse rotation switching of the motor cannot be dissipated in time, the winding temperature is continuously increased, the aging of insulating materials is accelerated, the service life and the operation reliability of the motor are seriously affected, and even faults are caused. The traditional alternating current motor mainly depends on natural convection and radiation heat dissipation on the surface of a stator shell, and a centrifugal fan is additionally arranged at the tail end of a rotating shaft in part of models to perform forced air cooling on the outer surface of the stator shell. However, these heat dissipation modes have inherent limitations: The heat dissipation path is long, the thermal resistance is large, heat is generated from the inner rotor, and can be dissipated to the outside only through multiple thermal resistances such as a rotor core, an air gap, a stator, inner air, a stator shell and the like, so that the efficiency is low. The air gap heat dissipation bottleneck stands out, namely the air gap (typically 0.3-1.5 mm) between the stator and the rotor is a heat dissipation critical path, but is filled with air with poor heat conductivity. In a narrow air gap, the airflow generated by rotor rotation has limited shearing action, a stable thermal boundary layer is easy to form on the surface of a stator, heat transfer to air in the air gap is seriously hindered, and the heat dissipation core bottleneck is formed. The external forced air cooling effect is limited and has the defect that although the external fan can enhance the heat dissipation of the stator shell, the direct cooling effect on the inside of the motor, especially on the air gap area is weak. Meanwhile, the fan increases the axial size, the running noise and the additional power consumption, which is contrary to the design trend of the compact and silent washing machine. The working characteristics of frequent forward and reverse rotation of the motor of the washing machine cannot be adapted to complex working conditions, so that any traditional blade design which effectively guides wind depending on the rotation direction of the rotor can fail in one rotation direction, and uneven heat dissipation is caused. Attempts to improve air gap heat dissipation have also been made in the prior art to increase the size of the air gap to improve air flow, but this has resulted in direct increases in motor reluctance, increases in field current, decreases in power factor and efficiency, at the expense of electromagnetic performance, which is not desirable. Therefore, an innovative heat dissipation solution needs to be developed, which can actively, directly and efficiently strengthen the heat dissipation capability of the air gap region of the motor on the premise of not changing the basic electromagnetic design of the motor (such as not increasing the air gap), not remarkably increasing the volume and noise of the motor and adapting to the working condition of frequent forward and reverse rotation, thereby fundamentally breaking through the technical bottleneck of the traditional heat dissipation mode. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides an alternating current motor with an efficient heat dissipation structure. On the premise of not influencing the electromagnetic performance of the motor core and not remarkably increasing the volume and the cost, the high-efficiency, directional and self-adaptive cooling of an air gap area is realized, the temperature rise of the motor is remarkably reduced, the operation reliability and the service life of the motor are improved, and the motor is particularly suitable for harsh application environments such as washing machines and the like. In order to achieve the above purpose, the present invention provides the following technical solutions: An alternating current motor with a high-efficiency heat dissipation structure comprises a stator assembly, a rotor assembly, an end cover and an active heat dissipation system integrated in the motor. The active heat dissipation system comprises two main core components of an airflow excitation unit and an ai