Spring-Loaded Rotor Centering Jig for Shipping and Assembly
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Solution Overview
Problem
Existing generator rotors face challenges in maintaining precise centering during shipping and assembly, leading to potential damage from impacts with the generator stator.
Innovation Solution
A centering jig comprising a housing, pin, spring, and compressing element is used to securely hold the generator rotor's conical surfaces together, ensuring alignment and preventing damage during transport and assembly, with features like set screws and cams for controlled compression and reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a centering jig is used to maintain rotor alignment, then manufacturing precision and reliability are improved, but device complexity increases
Solution Approach 1:
The centering jig is divided into modular components: a housing with plate, a pin with head portion, a spring, and a compressing element. This segmentation allows each component to perform its specific function while simplifying manufacturing and assembly of individual parts, resolving the contradiction between achieving precise alignment and maintaining simple device structure.
Solution Approach 2:
The centering jig is pre-assembled with the spring and compressing element configured before use. The compressing element is pre-positioned to apply force to the pin, which will subsequently press the rotor onto the housing. This preliminary configuration ensures precise alignment is achieved automatically during installation without requiring complex adjustment mechanisms.
2Ease of operation
If a spring-based compression system is used, then ease of operation and reuse are improved, but device complexity increases
Solution Approach 1:
The spring automatically generates the compressive force needed to press the rotor onto the housing. The compressing element simply needs to be positioned to engage the spring, after which the spring self-generates the necessary compression force. This eliminates the need for external actuators or complex control systems, improving ease of operation while keeping the device relatively simple.
Solution Approach 2:
The spring provides a dynamic, adjustable compression force that can be easily modified by repositioning the compressing element. This allows the same device to accommodate different rotor sizes and compression requirements without requiring multiple specialized tools or complex adjustment mechanisms, enhancing both ease of operation and reusability.
3Manufacturing precision
If conical surfaces are pressed together for centering, then manufacturing precision is improved, but risk of damage from impacts increases
Solution Approach 1:
The spring acts as a cushioning element that gradually applies compressive force to press the rotor onto the housing. This gradual compression prevents sudden impacts that could damage the conical surfaces, while still achieving the necessary precision alignment. The spring absorbs and distributes the force over time, protecting the delicate conical contact surfaces.
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
The centering jig effectively maintains rotor alignment, preventing damage and facilitating easy assembly, while allowing for reuse and efficient transport, thus enhancing reliability and assembly efficiency.
Implementation Method 1
the spring is arranged to apply a force to the head portion
Implementation Method 2
the compressing element is for compressing the spring
Data Source
AI summary
A centering jig for a generator rotor including a housing, a pin, a spring, and a compressing element. The housing has a plate arranged for bolting to a generator housing, the pin extends through the plate and has a head portion, the spring is arranged to apply a force to the head portion, and the compressing element is for compressing the spring. In some example embodiments, the plate has a first pair of apertures radially offset from the pin. In some example embodiments, the housing also includes a pair of tubular portions extending from the plate and aligned with respective ones of the first pair of apertures. In an example embodiment, the plate also includes a second pair of apertures radially offset from the first pair of apertures. In an example embodiment, the pin has a distal end arranged for contacting a shaft of the generator rotor.