Differentially Interconnectable Receiver Coils for Position Measurement
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Solution Overview
Problem
Existing position measurement systems face challenges with high signal offset from single receiver coils and large space requirements due to differential coil pairs, making it difficult to achieve a division period of 1 mm in an economical manner.
Innovation Solution
The system employs multiple separate transmitter areas with a single receiver coil each, allowing differential interconnection of adjacent receiver coils via switching means, reducing space requirements and signal offset, and using a differential amplifier to enhance signal strength and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If single receiver coils are used, then the space requirement is reduced, but the signal offset becomes high
Solution Approach 1:
The patent applies dynamic switching between different receiver coil configurations (single coil mode and differential pair mode) based on the measured position. The switching means dynamically reconfigures the receiver coils during operation, allowing the system to achieve low offset measurements at certain positions while maintaining compact spacing throughout the entire measurement range.
2Measurement precision
If differential coil pairs are used, then the signal offset is reduced, but the space requirement increases
Solution Approach 1:
The patent divides the measurement range into multiple segments or zones, each associated with specific transmitter areas. Different receiver coil pairs are assigned to different segments, allowing differential measurement (low offset) to be achieved only in the required measurement zones rather than requiring differential pairs across the entire range, thus reducing overall space requirements.
Solution Approach 2:
The system dynamically switches between single coil and differential pair configurations based on which transmitter area is currently active. This dynamic reconfiguration allows the system to achieve low offset measurements only when needed (in differential mode) while maintaining compact coil spacing throughout the entire range by using single coils in non-differential zones.
3Measurement precision
If more receiver coils are used to reduce division period, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Each receiver coil is designed to serve multiple functions: it can operate as a single coil for general positioning, as part of a differential pair for high-precision low-offset measurements, and can be dynamically reassigned to different measurement zones. This multi-functionality allows the system to achieve fine division periods without proportionally increasing the total number of coils.
Solution Approach 2:
The switching means enables dynamic reassignment of receiver coils to different functional roles during operation. Coils can be switched between single-coil mode and differential-pair mode, and different pairs can be activated depending on the current measurement position, allowing the system to achieve high precision measurements with fewer physical coils than would be required if all coils operated simultaneously in differential mode.
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 reduces the number of receiver coils needed, minimizes space requirements, and improves signal evaluation by reducing offset and interference, enabling efficient and economical position measurement.
Implementation Method 1
The transmitter winding arrangement (41) generates an electromagnetic alternating field
Implementation Method 2
The inductive coupling between the transmitter winding arrangement and the receiver coils is a function of the position of the scanning device with respect to the material measure
Data Source
AI summary
A position measurement system including a material measure and a scanning device movable relative to one another with respect to a measurement direction. The material measure has a plurality of markings which are arranged in a row with respect to the measurement direction, wherein the scanning device includes a transmitter winding arrangement. Multiple receiver coils are provided which are arranged in a row with respect to the measurement direction. The inductive coupling between the transmitter winding arrangement and the receiver coils is a function of the position of the scanning device with respect to the material measure. The transmitter winding arrangement defines multiple separate transmitter areas which are arranged in a row with respect to the measurement direction. A maximum of one single receiver coil is situated in each of the transmitter areas. At least one switching means is provided via which the two adjacent receiver coils are differentially interconnectable.