Rotor Extraction Guide Prevents Stator Damage
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Solution Overview
Problem
Existing methods for inserting or extracting a rotor into a stator in rotating electric machines are unreliable, leading to a risk of rotor rotation and potential damage due to unsecured connections using belts, which can fail to prevent the rotor from falling onto the stator.
Innovation Solution
A method involving a device with a first guide connected to the rotor's fan blades and a second guide fixed to the stator, using elongated apertures and screws to securely stabilize the rotor during extraction or insertion, preventing rotation and ensuring reliable operation by sliding the guides on each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If belts are used to connect guides to rotor shaft, then the device complexity is reduced, but the reliability of rotor guidance during extraction is worsened
Solution Approach 1:
The patent removes the belts from the system entirely and replaces them with a direct mechanical connection between the guides and the rotor shaft. The guides are now rigidly attached to the shaft through keyways and set screws, eliminating the flexible belt connection that caused reliability issues while maintaining manageable device complexity.
Solution Approach 2:
The patent combines the guidance function and the rotational constraint function into a single integrated guide structure. The guides are directly mounted to the rotor shaft and work together with the stator guide to form a unified guidance system, eliminating the need for separate belt connections and improving overall reliability.
2Reliability
If rigid connection is used between guide and rotor shaft, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent divides the rigid connection system into modular components: the guide body with integrated keyway, the separate key for transmitting torque, and adjustable set screws for securing the connection. This segmentation allows for reliable rigid connection while maintaining ease of assembly and disassembly, balancing reliability with manageable complexity.
3Reliability
If guides are used to prevent rotor rotation, then the reliability is improved, but the ease of operation is worsened
Solution Approach 1:
The patent incorporates adjustable set screws that allow the operator to dynamically control the tightness of the guide connection to the rotor shaft. During extraction operations, the connection can be tightened to prevent rotation, and when not in use, the connection can be loosened or disconnected, providing flexibility that improves ease of operation while maintaining reliability when needed.
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 solution provides a reliable and stable mechanism for rotor extraction or insertion, preventing rotation and ensuring safe handling by maintaining a secure connection between the rotor and stator, thus preventing damage and ensuring reliable maintenance operations.
Implementation Method 1
these guides prevent rotation by sliding one on the other
Data Source
Figure 1~2
Figure 3~4
AI summary
The method for extraction or introduction of a rotor (4) from or into a stator (2) of an electric machine (1) includes removing the fan blades (20) from the seats (19) of the rotor shaft (26), connecting a first guide (16) into the seats (19) of the removed fan blades (20), connecting a second guide (23) to the stator or to an element fixed to the stator (2), extracting or inserting the rotor (4) by sliding the first guide (16) on the second guide (23).