Axial Wedge Tapping Device for Rotating Electrical Machines
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Solution Overview
Problem
Existing wedge tapping devices for rotating electrical machines face difficulties in being inserted through the gap between the rotor and stator, achieving sufficient tapping force, and measuring tapping input waveforms without pulling out the rotor.
Innovation Solution
A wedge tapping device with a tapping arm oriented perpendicular to the tapping direction, equipped with an energy supplying portion, an absorbing portion, and a tapping force measuring instrument, allowing it to be inserted through the gap and apply a sufficient tapping force while measuring the tapping input waveform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wedge tapping device is configured to include a measuring instrument for measuring a tapping input waveform, then the device can measure tapping input, but the device cannot be inserted through the gap between the rotor and stator
Solution Approach 1:
The patent reorients the tapping arm from a radial configuration to an axial configuration, changing the dimensional orientation of the device. This allows the measuring instrument to be positioned axially along the rotor shaft, enabling the device to pass through the radial gap between rotor and stator while maintaining measurement capability.
Solution Approach 2:
The measuring instrument is integrated into the tapping device structure, with the tapping arm and measuring components nested within a compact housing that can be inserted through the rotor-stator gap. The device components are arranged in a nested configuration to minimize overall dimensions.
2Length of moving object
If the device is made compact to be inserted through the gap between rotor and stator, then the device can enter the gap, but sufficient tapping force cannot be obtained
Solution Approach 1:
The patent employs a spring-based energy supplying portion that dynamically stores and releases elastic energy during the tapping operation. The spring is compressed during the return stroke and releases energy during the forward stroke, providing sufficient tapping force despite the compact device size. This dynamic energy storage and release mechanism allows a small device to generate large instantaneous forces.
3Force
If the device is configured to tap the wedge sufficiently, then sufficient tapping force can be obtained, but the device cannot be inserted through the gap between rotor and stator
Solution Approach 1:
The patent changes the orientation of the tapping arm from radial to axial, allowing the device to access the wedge from the axial direction through the rotor-stator gap. This dimensional reorientation enables sufficient tapping force to be applied while maintaining a compact profile that can fit through the gap.
Solution Approach 2:
The spring-based energy supplying portion provides dynamic force multiplication, allowing the compact device to generate sufficient tapping force through elastic energy release. The mechanical advantage provided by the spring mechanism enables a small device to exert large forces on the wedge.
4Device complexity
If a conventional wedge tapping device is used, then the device structure is simple, but the device cannot measure tapping input waveform
Solution Approach 1:
The patent integrates multiple functions into a single device: the tapping arm provides mechanical tapping, the spring provides energy storage and force multiplication, and the measuring instrument provides waveform measurement. This multi-functional integration allows the device to perform both tapping and measurement functions simultaneously without requiring separate equipment.
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
Enables effective inspection of wedge looseness in rotating electrical machines by providing a sufficient tapping force and measuring tapping input waveforms without requiring the rotor to be removed, ensuring accurate and efficient inspection.
Implementation Method 1
a spring or a dashpot configured to suppress energy to be applied to the tapping arm
Data Source
Figure 1~3
Figure 4
Figure 5
AI summary
A wedge looseness inspection for a rotating electrical machine has had a problem in that, particularly when a sensor configured to measure tapping input is disposed, insertion of a wedge tapping device through a gap between a rotor and a stator of a rotating electrical machine is impossible. The present invention provides a wedge tapping device (10) for a rotating electrical machine to be inserted through a gap between a rotor (6) and a stator (4) of the rotating electrical machine to tap a wedge (3) of the rotating electrical machine. The wedge tapping device (10) includes: a tapping portion (20) configured to tap the wedge of the rotating electrical machine and having a tapping force measuring portion configured to measure a tapping force of the tapping; an energy supplying portion (40) configured to apply tapping energy to the tapping portion; an absorbing portion (50) configured to suppress energy to be applied to the tapping portion; and a tapping arm (30), on which the tapping portion is disposed, and which has a longitudinal direction in a direction perpendicular to a direction in which the tapping portion performs tapping. The tapping arm is disposed so that the longitudinal direction is parallel to a rotation axis of the rotor when the tapping is performed in the gap, and the tapping portion, the energy supplying portion, and the absorbing portion are disposed in parallel along the longitudinal direction of the tapping arm.