Motor Assembly Structure for Vibration-Isolated Stator Fixation
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Solution Overview
Problem
Conventional motor assemblies are prone to damage due to vibrations caused by reaction forces, which lead to reduced lifespan as screws bear the shearing force, and the assembly process is complex.
Innovation Solution
A motor assembly design where the motor and motor fixing frame are separately connected to the housing, using an annular plate and rear end cap with screws passing through holes in the stator casing to absorb vibrations, eliminating direct stress on screws and simplifying assembly and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If screws are used to connect the front end cap, stator, and rear end cap, then the stator is fixed in the stator casing, but the screws bear shearing force from vibration and are easily damaged
Solution Approach 1:
The motor assembly is divided into separate components: the motor assembly (containing stator, rotor, and screws) and the motor fixing frame. This segmentation isolates the screws from vibration-induced shearing forces by allowing the motor assembly to move independently within the housing, while the motor fixing frame remains stationary and connects to the housing separately.
Solution Approach 2:
The motor fixing frame acts as an intermediary between the housing and the motor assembly. It provides a separate connection path to the housing, allowing the motor assembly to be secured without transmitting vibration forces directly to the screws that fasten the stator components.
2Stability of the object's composition
If screws connect the front end cap, stator, and rear end cap, then the stator is secured, but the assembly structure becomes complex and difficult to maintain
Solution Approach 1:
By segmenting the motor into a motor assembly and a motor fixing frame, the patent simplifies the overall assembly structure. The motor assembly can be pre-assembled and tested independently, then mounted as a unit to the housing via the motor fixing frame, reducing the complexity of in-situ assembly and maintenance operations.
Solution Approach 2:
The motor assembly is designed with dynamic mounting that allows for relative movement between the motor assembly and the motor fixing frame. This dynamic connection simplifies assembly by accommodating manufacturing tolerances and thermal expansion, while also facilitating easier disassembly for maintenance without requiring complete disconnection of all fasteners.
3Stability of the object's composition
If the motor assembly is rigidly mounted to the housing, then the structure is stable, but vibration from reaction forces damages the screws
Solution Approach 1:
The mounting structure is segmented into two independent connection systems: (1) internal screws securing the stator components within the motor assembly, and (2) external fasteners securing the motor fixing frame to the housing. This segmentation prevents vibration forces from the rigid housing connection from being transmitted to the internal screws.
Solution Approach 2:
The motor fixing frame serves as an intermediary mounting structure that decouples the vibration transmission path. It provides stable mounting to the housing while isolating the motor assembly's internal components from vibration-induced shearing forces, thereby protecting the screws from damage.
Data Source
AI summary
A motor assembly includes a motor in a housing. The motor includes a stator and a rotor mounted in the stator casing, and an output shaft engaged with the rotor passes through the stator casing. Two opposite ends of the stator casing and the stator abuts against an annular plate and a rear end cap, respectively. Each screw passes through the rear end cap and the stator to screw into the annular plate, so the stator is fixed and restricted from moving axially in the stator casing. A front end of the housing is engaged with a motor fixing frame. The output shaft passes through a bearing on the motor fixing frame. The motor fixing frame is spaced from the motor. With such design, a vibration of the output shaft during operation is transmitted to the housing, but not directly affect the screws in the motor, thereby increasing the durability of the motor assembly.