Electromagnetic Induction Encoder Coil Width Variation
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Solution Overview
Problem
Electromagnetic induction type encoders face challenges in detecting positional fluctuations between the detection head and scale due to cost and space constraints, making it difficult to add new sensors or detection patterns, which can lead to reduced measurement accuracy and potential collisions during sliding.
Innovation Solution
The encoder employs a detection head with first and second transceiver coils and corresponding conductors on the scale, along with receiver coils to detect magnetic flux phases, utilizing different widths in specific directions to differentiate signal intensity fluctuations and enable accurate positional detection without additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a new sensor or detection pattern is added to detect positional fluctuation, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The transceiver coils and receiver coils are designed to serve dual purposes: their primary function is for the electromagnetic induction type encoder to detect displacement, and their secondary function is to detect positional fluctuation between the detection head and scale. By making the existing coils multi-functional, the patent eliminates the need for additional sensors while enabling positional fluctuation detection, thus resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The encoder system uses its own existing components (transceiver coils and receiver coils) to detect positional fluctuation, rather than requiring external or additional detection devices. The coils detect both displacement and positional fluctuation signals through electromagnetic induction, allowing the system to self-diagnose its positional state using already-present hardware, thereby avoiding increased device complexity and cost
2Measurement precision
If the detection head and scale are positioned closely for accurate measurement, then measurement precision is improved, but the risk of collision during sliding increases
Solution Approach 1:
The patent implements a feedback mechanism where the receiver coils continuously detect the positional relationship between the detection head and scale. When positional fluctuation exceeds predetermined thresholds, the system generates alarm signals or error flags to warn of potential collisions. This real-time feedback allows the system to maintain close positioning for accuracy while providing early warning to prevent collisions, thus resolving the contradiction between measurement precision and reliability
Solution Approach 2:
The system performs preliminary detection of positional fluctuation using the receiver coils before actual collision occurs. By detecting changes in electromagnetic coupling between the transceiver and receiver coils, the system can identify abnormal positional relationships in advance and trigger alarm signals or protective actions, preventing the harmful effect of collision while maintaining the close positioning necessary for accurate measurement
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
This configuration allows for the detection of positional fluctuations between the detection head and scale with a simple structure, improving measurement accuracy and preventing collisions by using existing components to analyze signal intensity ratios and fluctuations.
Implementation Method 1
the first transceiver coil that is used for a first track and is configured to generate magnetic flux and a second transceiver coil that is used for a second track and is configured to generate magnetic flux
Implementation Method 2
the first receiver coil configured to be electromagnetically coupled with the magnetic flux generated by the first plurality of conductors and detect a phase of the magnetic flux
Data Source
AI summary
An electromagnetic induction type encoder, wherein at least one of widths of a first transceiver coil, a first plurality of conductors and a first receiver coil of a first track in a direction vertical to facing direction between a detection head and a scale and a measurement direction is different from corresponding width of a second transceiver coil, a second plurality of conductors and a second receiver coil in the direction vertical to the facing direction and the measurement direction.