Linear Motor Current Ratio Control for Multi-Cart Positioning
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Solution Overview
Problem
Existing moving-magnet type linear motor controlling systems face challenges in accurately controlling multiple carts due to increased copper loss, heat generation, and positional inaccuracies, particularly when multiple coil units apply thrusts to a cart, leading to deformation and reduced precision in factory automation systems.
Innovation Solution
A moving-magnet type linear motor controlling system that includes a plurality of coil units, a position detecting unit, and a controlling unit which determines the ratio of currents supplied to each coil unit based on the positions of the carts and impedance and thrust characteristics, allowing for precise calculation and application of necessary thrusts to achieve high accuracy in cart control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If multiple coil units apply thrusts to a cart, then the cart can be driven along the conveying path, but copper loss and heat generation increase
Solution Approach 1:
The patent dynamically adjusts the current ratio supplied to multiple coil units based on real-time position detection and impedance/thrust characteristics. By changing electrical parameters (current distribution) according to operational conditions, the system optimizes thrust generation while minimizing copper loss and heat generation in each coil unit.
2Force
If multiple coil units apply thrusts to a cart, then the cart can be driven along the conveying path, but heat generation increases causing casing deformation
Solution Approach 1:
The system modifies electrical parameters (current distribution) to multiple coil units based on their individual impedance and thrust characteristics, thereby controlling heat generation in each unit while maintaining required thrust output, preventing excessive temperature rise and casing deformation.
3Device complexity
If the current ratio to coil units is not optimized, then control simplicity is maintained, but manufacturing precision decreases
Solution Approach 1:
The patent employs position detection means to continuously monitor cart position and uses this feedback information, combined with pre-stored impedance and thrust characteristics, to automatically calculate and adjust the optimal current ratio for each coil unit. This closed-loop control achieves high positioning accuracy without requiring complex manual intervention.
4Ease of operation
If lead switches are used for energization control, then coil energization can be controlled, but positioning accuracy decreases when multiple movers are present
Solution Approach 1:
Instead of using simple on/off lead switch control, the patent dynamically adjusts the current ratio supplied to each coil unit based on real-time position detection and stored characteristics. This continuous parameter adjustment enables accurate positioning even when multiple movers are present by optimizing thrust distribution.
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 enables highly accurate control of carts even when multiple coil units apply thrusts, minimizing energy loss and heat generation, thereby improving precision and stability in factory automation systems.
Implementation Method 1
a plurality of coil units 116 having a plurality of coils 301; a position detecting unit 113 configured to detect positions of a plurality of carts 201 which are moved along the plurality of coil units 116
Data Source
AI summary
A moving-magnet type linear motor controlling system which can highly accurately control carts even when a plurality of coil units apply forces to the carts is provided. The moving-magnet type linear motor controlling system has: a plurality of coil units having a plurality of coils; a position detecting unit for detecting the positions of the plural carts which are moved along the plurality of coil units; and a controlling unit for determining a ratio of currents which are supplied to the plural coil units on the basis of the positions of the plural carts and an impedance and thrust characteristics of each of the plural coil units.