Armature Static Charge Elimination with Multi-Point Ground Contacts
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Solution Overview
Problem
Existing static charge elimination methods are ineffective on complex structures like armatures of rotating electrical machines, leading to electrical hazards and reduced productivity due to insulation inspections causing static charge and dielectric polarization.
Innovation Solution
A static charge elimination method involving simultaneous contact of multiple grounded contacts with the core, metallic sections, outer layers, and resin-molded members of the armature, using a static charge eliminator with a drive unit to ensure overlapping contact times without coinciding start or end times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage is applied to the armature for insulation inspection, then insulation faults can be detected, but static electricity is generated on the armature causing electrical shock hazard to workers
Solution Approach 1:
The patent applies preliminary action by grounding the armature at multiple points (core, metallic sections, outer layers) before the insulation inspection process. This pre-grounding ensures that any static electricity generated during voltage application is immediately discharged, eliminating the electrical shock hazard while maintaining the ability to detect insulation faults through the inspection process.
Solution Approach 2:
The patent converts the harmful static electricity generation into a beneficial discharge process. By providing multiple grounded contact points, the static charge that naturally builds up during insulation inspection is safely directed to ground through the armature's various components, transforming the hazard into a controlled discharge mechanism that actually verifies the grounding effectiveness.
2Object-affected harmful factors
If a long time interval is allowed after insulation inspection to ensure worker safety, then electrical shock risk is reduced, but productivity of armature production is reduced
Solution Approach 1:
The patent eliminates the need for waiting time by implementing preliminary grounding measures. By establishing multiple ground contact points during the inspection process itself, the armature remains safely grounded throughout and immediately after inspection, allowing workers to handle the armature without any waiting period for charge dissipation.
Solution Approach 2:
The patent ensures continuous grounding action throughout the inspection process and beyond. The multiple ground contacts maintain a continuous discharge path, ensuring that the armature remains at ground potential throughout the entire handling process, thereby eliminating the need for time delays while maintaining safety.
3Object-affected harmful factors
If existing ionizer-based static charge elimination methods are used on armatures, then simple structures can be neutralized, but complex armature structures with conductors and insulators cannot be effectively neutralized
Solution Approach 1:
The patent applies segmentation by dividing the grounding process into multiple distinct contact points targeting different parts of the complex armature structure. Instead of using a single ionizer approach, the method creates separate ground paths through the core, metallic wire sections, and outer insulating layers, allowing each component to be independently grounded according to its electrical properties.
Solution Approach 2:
The patent applies local quality by providing different grounding approaches for different parts of the armature. Conductive components (core, metallic sections) receive direct electrical ground contacts, while insulating components (outer layers) are addressed through specialized contact methods, ensuring each material type is handled according to its specific electrical characteristics.
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
Effectively neutralizes static charge, preventing dielectric polarization and enhancing safety and productivity by ensuring complete neutralization without electrical hazards.
Implementation Method 1
a first contact in contact with a core of the armature, the first contact being connected to ground; a second contact in contact with a metallic section of one of wire segments constituting a coil of the armature or a metallic section of one of power wires electrically connecting with the coil, the second contact being connected to ground
Data Source
AI summary
A static charge eliminator for neutralizing static electricity on an armature, such as a rotor or a stator of a rotating electrical machine. The static charge eliminator includes a first contact, a second contact, a third contact, and a drive unit. The drive unit works to move at least one of the first, second, and third contact and the armature to simultaneously achieve electrical contacts between the first contact and a core of the armature, between the second contact and a metallic section(s) of wire segments of a coil of the armature or power wires electrically connecting with the coil, and between the third contact and outer layers of portions of the wire segments contacting a coil end protruding outside an axial end of the core of the armature. A static charge elimination method is also provided.