Stator assembly fixing structure: How to ensure the key to stable operation of the motor?

The stator assembly is the core part of the motor, including the stator core, winding, and the base and end cover that fix them together. Among them, the base, as the supporting frame of the entire stator assembly, is usually made of high-strength cast iron, steel plate welding or aluminum alloy casting. Its design must meet the comprehensive considerations of mechanical strength, heat dissipation performance and manufacturing cost. The end cover is located at both ends of the stator, which is used to close the stator cavity, protect the winding from the external environment, and serve as a support for the bearing seat to ensure the smooth rotation of the rotor shaft.

During the operation of the motor, the magnetic stator assembly must withstand the radial and axial mechanical stresses generated by the rotation of the rotor, as well as the vibration caused by the electromagnetic force. Therefore, the structural design of the base and end cover is crucial.

Base design: The base usually adopts a thick-walled structure to increase its anti-deformation ability. When designing, the power level, speed and operating environment of the motor must be considered, and the wall thickness must be reasonably distributed to balance strength and weight. In addition, heat dissipation ribs are often provided inside the base to enhance the heat dissipation effect and prevent performance degradation caused by overheating.
End cover design: The end cover must have sufficient rigidity to resist axial force, while ensuring the coaxiality of the bearing seat and reducing the shaking of the rotor shaft. The design usually adopts a reinforcing rib structure to increase the overall strength of the end cover. In addition, the sealing design between the end cover and the base is also key, and it is necessary to prevent oil or dust from entering the stator cavity, affecting the insulation of the winding and the life of the bearing.

As the core of the electromagnetic conversion of the motor, the precise positioning of the stator core and winding is crucial to reduce vibration, reduce noise, and improve operating efficiency.

Core fixation: The stator core is fixed to the base by pressing or welding to ensure that it does not move during operation. The pressing method requires strict control of the pressing force to avoid deformation of the core; the welding method requires ensuring the quality of the weld to prevent cracking caused by welding stress.
Winding fixation: The winding is fixed in the stator core slot by slot wedges, varnishing or binding tape to prevent loosening under the action of electromagnetic force. Winding fixation must not only ensure electrical insulation, but also consider heat dissipation requirements to avoid local overheating.

Vibration and noise are important indicators for evaluating motor performance and are also key factors affecting user experience. The optimized design of the stator assembly fixed structure is of great significance for reducing vibration and noise.

Dynamic balance: By accurately calculating the rotor mass distribution, the dynamic balance of the motor is achieved, the unbalanced force during rotation is reduced, and thus the vibration is reduced.
Elastic support: Setting elastic support (such as rubber pads) between the base and the foundation can effectively isolate vibration, reduce the energy transmitted to the foundation, and reduce noise.
Structural optimization: Perform finite element analysis on the base and end cover, optimize the structural design, reduce the stress concentration area, improve the overall stiffness, and further suppress vibration.

The durability and reliability of the stator assembly fixed structure are directly related to the service life and maintenance cost of the motor. Therefore, various factors in long-term operation need to be considered during design.

Material selection: Select high-strength, corrosion-resistant, and wear-resistant materials, such as high-quality cast iron, stainless steel, or high-strength alloys, to improve the durability of the fixed structure.
Manufacturing process: Use advanced casting, welding, and processing technologies to ensure the dimensional accuracy and surface quality of the fixed structure and reduce early failures caused by manufacturing defects.
Maintenance convenience: The design takes into account the operating space and tool requirements of maintenance personnel, making it easy to perform daily inspections, repairs, and replacement of parts, thus extending the overall life of the motor.