Position Detection Device Electrode Phase Analysis
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Solution Overview
Problem
Existing position detection devices face challenges in accurately setting a reference position for movable elements with increased ranges of movement, often requiring complex configurations and high costs due to the need for multiple electrodes and additional detection mechanisms.
Innovation Solution
A position detection device comprising a fixed element, a movable element, first electrodes with multiple phases, a second electrode, and a third electrode, along with a detection circuit that uses signal intensity and phase to determine the prescribed position, allowing for simple and accurate reference setting even with large movement ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the range of possible movement of the movable element is increased, then the position detection range is improved, but the number of electrodes required increases leading to higher cost and complexity
Solution Approach 1:
The third electrode is configured to detect both the prescribed position (origin) and contribute to movement range detection, making it multi-functional. This reduces the need for separate origin detection electrodes while maintaining accurate position detection across extended ranges.
Solution Approach 2:
The first electrodes are divided into multiple phases with different phase shifts, allowing the system to detect position information from multiple phases simultaneously. This segmentation enables accurate position detection across larger ranges without proportionally increasing the total number of electrodes.
2Measurement precision
If additional detection mechanisms are added to set the reference position, then the accuracy of reference setting is improved, but the device complexity and cost increase
Solution Approach 1:
The origin detection function is merged into the existing electrode structure by configuring the third electrode to detect the prescribed position based on signal intensity and phase. This eliminates the need for separate origin detection mechanisms while maintaining detection accuracy.
Solution Approach 2:
The electrode system serves itself by using the same electrodes that detect movement to also detect the origin position. The third electrode utilizes the electrical signals already present in the system to determine when the movable element reaches the prescribed position, without requiring external or additional specialized components.
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 precise and cost-effective detection of movable element positions with a simplified configuration, effectively handling increased movement ranges by utilizing signal intensity and phase analysis.
Implementation Method 1
The first electrodes include two or more phases to which are respectively supplied with electrical signals having mutually different phases
Implementation Method 2
detecting the alternating potential distribution using a voltage detection electrode of the fixed element to generate a vector having two signals as components and measuring the potential of the movable element referenced to the fixed element
Implementation Method 3
supplying a voltage to an induction electrode of a fixed element to generate an alternating potential distribution in a comb-shaped electrode of a movable element by means of electrostatic induction
Data Source
AI summary
A position detection device includes a fixed element, a movable element, a plurality of first electrodes, a second electrode, a third electrode and a first detection circuit. The movable element is movable relative to the fixed element. The first electrodes are arranged on either the fixed element or the movable element, and the second electrode is on the other of the movable element or the fixed element. The first electrodes include two or more phases with electrical signals having mutually different phases. The third electrode is provided on the fixed element and opposing the electrode that is on the movable element while the movable element is in a prescribed position. The first detection circuit detects when the movable element is in the prescribed position based on electrical signals generated in the second and third electrodes in accordance with the electrical signals supplied to the first electrodes.