Electric Motor Dismantling Fixture for Contact-Free Rotor Separation
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Solution Overview
Problem
Existing methods for disassembling electric motors to replace worn rotor bearings are time-consuming and difficult, requiring precise handling to avoid contact between the stator and rotor, and often necessitate multiple guide rings with different dimensions, leading to logistical complexity and operator errors.
Innovation Solution
A device with a first fixing device for the rotor and a second fixing device for the stator, featuring centering elements and a stator receptacle, allows secure clamping and relative movement in the longitudinal direction to separate the rotor and stator without direct contact, eliminating the need for guide rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guide rings are used to prevent contact between stator and rotor during disassembly, then contact avoidance is ensured, but the device complexity increases and multiple guide rings with different dimensions must be kept on hand
Solution Approach 1:
The patent removes the guide rings entirely from the disassembly process. Instead of using guide rings to prevent contact, the invention directly separates the stator and rotor using a pulling device that applies force to the rotor shaft, extracting the rotor from the stator without requiring any guiding elements.
Solution Approach 2:
The pulling device is designed as a universal tool that can handle different rotor sizes and motor types without requiring different components. The device includes adjustable elements and a standardized interface that adapts to various rotor dimensions, eliminating the need for multiple specialized guide rings.
2Reliability
If guide rings are fitted to rotor and stator sides before disassembly, then contact prevention is achieved, but the assembly time increases and accessibility limitations may make attachment impossible
Solution Approach 1:
The guide rings are completely eliminated from the process. The pulling device achieves contact prevention through its structural design that directly engages with the rotor shaft and stator housing, applying separating forces without requiring any intermediate guiding elements to be attached to the motor components.
Solution Approach 2:
The pulling device is pre-configured with adjustable arms and engagement points that can be positioned before contact with the motor. This allows the operator to set up the device and apply separating forces immediately, without needing to attach guide rings to difficult-to-reach areas of the rotor or stator.
3Adaptability or versatility
If multiple guide rings with different geometric dimensions are kept on hand, then compatibility with various motor designs is improved, but logistical complexity increases and operator error risk increases
Solution Approach 1:
The pulling device incorporates adjustable arms, modular components, and variable engagement points that allow a single device to accommodate different rotor diameters, lengths, and motor configurations. This universal design eliminates the need for multiple specialized guide rings while maintaining compatibility across various motor types.
Solution Approach 2:
The pulling device features dynamically adjustable elements including telescopic arms, movable clamps, and repositionable engagement points. These dynamic components can be configured in real-time to match different motor geometries, providing adaptability without requiring a inventory of fixed-dimension guide rings.
4Length of stationary object
If the gap between stator and rotor is less than 1 mm, then motor compactness is improved, but the risk of irreversible damage during disassembly increases without appropriate guidance
Solution Approach 1:
The invention eliminates the need for guide rings by using a pulling device that applies controlled separating forces to the rotor shaft. This direct extraction method maintains the tight 1mm gap during normal operation while safely separating the components during disassembly, as the pulling device distributes forces through multiple contact points rather than relying on narrow guide ring interfaces.
Solution Approach 2:
The pulling device incorporates cushioning elements and controlled force application mechanisms that prevent sudden or excessive separation forces. This protects the tight clearance between stator and rotor during disassembly, preventing irreversible damage while maintaining the compact 1mm gap design in the assembled motor.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a device for disassembling an electric motor comprising a rotor and a stator, with a first fixing device (6) for the rotor (4), which has a first centering element (8) and a second centering element (9), wherein the centering elements (8, 9) are arranged opposite each other in a longitudinal orientation, forming a receiving space (12) for receiving the rotor (4), and are configured to hold the rotor (4) securely between them, and with a second fixing device (7) for the stator (3), which has a stator receptacle (13) and fastening means (14) for securing the position of the stator (3) relative to the stator receptacle (13), wherein the stator receptacle (13) is designed to be translationally movable in the vertical direction (29) of a frame (16) and thus in the longitudinal direction (5) of the rotor in relation to the first fixing device (6).