Stator Segment Position Detection for Linear Motor Systems
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Solution Overview
Problem
Linear motor-based transport systems require complex multi-position sensor setups and additional bus systems for position detection, leading to increased system complexity and costs.
Innovation Solution
Integrating a position detection means into the stator segment that can detect multiple positions and transmit them synchronously with control data via a real-time bus, eliminating the need for additional multi-position encoders and simplifying the bus system architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional multi-position encoders are installed to detect positions of multiple transport runners, then position detection capability is improved, but system complexity and cost increase
Solution Approach 1:
The motor encoder is designed to serve dual purposes: controlling the linear motor and detecting positions of multiple transport runners. The evaluation unit processes encoder signals to determine both motor control parameters and positions of multiple runners, eliminating the need for separate multi-position encoders
Solution Approach 2:
The position detection function for multiple transport runners is merged with the motor control function. The same encoder and evaluation unit that control the linear motor are also used to detect positions of multiple runners, combining what were previously separate functions into one integrated system
2Loss of information
If additional bus systems are connected for multi-position encoders, then position information transmission is improved, but system complexity increases
Solution Approach 1:
The first bus is designed to carry both motor control data and position information for multiple runners. The transmission unit multiplexes these different types of data onto the same communication channel, eliminating the need for a separate second bus
3Measurement precision
If reading heads with many wires are used for position detection, then position detection accuracy is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The mechanical reading head system with multiple wires is replaced by an electronic evaluation unit that processes encoder signals. The evaluation unit uses electronic signal processing to determine positions of multiple runners without requiring physical reading heads and their complex wire connections
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 solution reduces system complexity, lowers costs, and simplifies project planning and commissioning by allowing all position detection to be handled through a single position detection means, ensuring isochronous communication and facilitating geographic representation of transport runner locations for monitoring and visualization.
Implementation Method 1
A magnetic field is generated by individually energizing coils of the means for generating a traveling magnetic field
Implementation Method 2
a position detection means for determining a position of a transport runner located on the stator segment
Data Source
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AI summary
A stator segment (1) for a linear motor-based transport system is further developed such that a transmitter unit (40) for the cyclic transmission of a control data set (CD) in a first clock cycle (TA1) transmits, in addition to the transmission of the control data set (CD), a position value (Mi) synchronously with the clock cycle, wherein several positions (M1,..,Mn) are present as a sequence (F) with a number (n) of elements and an element (Fi) with an index (i) corresponds to a position (Mi), the transmitter unit (40) is further configured to increment the index (i) from a starting value with each first clock cycle (TA1) and to transmit an element (Fi) following the control data set (CD), the transmitter unit (40) is further configured to carry out the transmission of all elements (Fi) in a transmission interval (Ü), the transmission interval (Ü) being a multiple of the first clock cycle (TA1).