Rotary Electric Machine Holding Member Thermal Fixation
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Solution Overview
Problem
The existing rotary electric machines face challenges in securely fixing the holding member within the casing, necessitating enhanced fixation methods to ensure stability, particularly in high-temperature environments.
Innovation Solution
A rotary electric machine design where the holding member, made of an aluminum alloy, is inserted into a casing that has undergone permanent growth, allowing the holding member to grow permanently and secure more firmly upon exposure to heat, increasing the tightening load and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the holding member is fixed in the casing using conventional methods, then the assembly is simple, but the fixation strength is insufficient and the holding member may loosen under thermal cycling
Solution Approach 1:
The invention changes the physical parameter of the holding member by utilizing permanent growth through thermal exposure. The aluminum alloy holding member is designed to undergo permanent dimensional changes when exposed to high temperatures during motor operation, allowing it to grow and increase the pressing force against the casing, thereby strengthening fixation without additional fastening mechanisms
Solution Approach 2:
The holding member performs self-fixation through its own thermal response to operating conditions. During thermal cycling in the motor environment, the holding member automatically grows and increases its clamping force on itself and the casing, eliminating the need for external fastening systems or additional fixation components
2Reliability
If additional fastening methods are used to secure the holding member, then the fixation strength increases, but the manufacturing complexity and time increase
Solution Approach 1:
The invention extracts and eliminates the need for additional fastening components (screws, clips, or other fixation elements) by utilizing the inherent thermal properties of the aluminum alloy holding member. The permanent growth mechanism provides self-sufficient fixation, removing unnecessary parts and simplifying the assembly process while maintaining reliable fixation
Solution Approach 2:
The invention accepts that the holding member will undergo permanent dimensional changes during its service life and designs this permanent growth as a beneficial feature rather than a defect. The holding member is designed to be replaced as a unit if necessary, and its permanent growth during operation is utilized to maintain fixation reliability without requiring maintenance or adjustment
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively increases the tightening load between the holding member and the casing, ensuring secure fixation without the need for additional fastening methods, simplifying manufacturing and maintaining stability in high-temperature conditions.
Implementation Method 1
the holding member grows permanently to be fixed more firmly to the casing
Implementation Method 2
heating at 200° C. for five hours
Data Source
AI summary
An object of the present invention is to hold a holding member appropriately in a casing.A rotary electric machine includes a rotor having a drive shaft, a stator provided on an outer periphery of the rotor, a bearing B2 that rotatably supports the drive shaft, a holding member that contains an aluminum alloy member and holds the bearing, and a casing that houses the rotor, the stator, the bearing, and the holding member. The casing is made of a member that does not grow permanently or an aluminum alloy member that is permanently grown when the holding member is fixed to the casing. The holding member is in a state before permanent growth before being fixed in the casing, and the holding member grows permanently to be fixed more firmly to the casing.