Generator Air Gap Protection Structure for Eccentric Rotor Contact
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Solution Overview
Problem
Conventional air gap real-time measurement and control devices in generators fail to provide effective protection when the air gap is too small, leading to potential damage and instability.
Innovation Solution
A device with a stator and rotor, incorporating an air gap protection mechanism that includes rotating structures made of wear-resistant non-metallic materials, which can rotate relative to the rotor and stator to maintain a stable air gap, preventing eccentric rotation and sweep-chamber issues, and featuring a displacement sensor and alarm system for real-time monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air gap of the generator is too large, then the rotor can rotate without eccentricity, but the magnetic field induction between the stator and the rotor is weak, reducing the efficiency of the generator
Solution Approach 1:
The air gap protection device is pre-installed on the stator or rotor before operation, with its rotating structure positioned to contact the other component when the air gap becomes too small. This preliminary arrangement ensures that protection is already in place before eccentric rotation occurs, allowing the air gap to be maintained at an optimal size for efficiency while preventing damage.
Solution Approach 2:
The air gap protection device acts as an intermediary component between the stator and rotor. When the air gap becomes too small, the rotating structure of the protection device contacts the other component first, serving as a mediator that prevents direct contact and potential damage between the stator and rotor, thus allowing the air gap to be optimized for efficiency.
2Productivity
If the air gap of the generator is too small, then the magnetic field induction is strong, but the rotor will be eccentric during rotation, causing sweep-chamber and damage to the generator
Solution Approach 1:
The air gap protection device applies preliminary anti-action by being positioned to contact the rotor or stator before eccentric rotation can cause damage. The rotating structure is designed to engage with the other component when the air gap shrinks below the safe threshold, creating a counteracting force that prevents the harmful eccentric rotation from occurring in the first place.
Solution Approach 2:
The air gap protection device provides beforehand cushioning by placing a protective layer (the rotating structure) between the stator and rotor. This cushioning layer is positioned in advance and will absorb or redirect contact forces if the air gap becomes too small, preventing direct damage to the generator components while allowing efficient operation at optimal air gap sizes.
3Measurement precision
If displacement sensors are used to monitor the air gap, then the variations of the air gap can be known, but the sensors can only play a monitoring role and cannot provide effective protection when the air gap is too small
Solution Approach 1:
The air gap protection device is self-service in that it automatically activates when needed without requiring external monitoring or control. The rotating structure is mechanically positioned to contact the stator or rotor when the air gap becomes too small, providing automatic protection based on the physical state of the system rather than relying on sensor detection and external control responses.
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 ensures effective protection against air gap reduction, stabilizing the operation of the generator by preventing damage and ensuring smooth rotation, while the alarm system promptly alerts maintenance personnel to potential issues.
Implementation Method 1
the air gap protection device rotates relative to the other one of the stator and the rotor when the air gap protection device is in contact with the other one of the stator and the rotor
Data Source
AI summary
Disclosed is a device with a stator and a rotor, the device comprising: a stator; a rotor, wherein an air gap is provided between the rotor and the stator; and an air gap protection device fixedly connected to the stator, wherein the radial distance between the air gap protection device and the rotor is less than the radial distance between the stator and the rotor, and the air gap protection device rotates relative to the rotor when in contact with the rotor. By arranging the air gap protection device fixedly connected to the stator, the air gap protection device can rotate relative to the rotor when in contact with the rotor, and the radial distance between the air gap protection device and the rotor is less than the radial distance between the stator and the rotor.