Linear Motor Transfer Path Overload Detection and Cooling
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Solution Overview
Problem
Existing transfer systems with linear motors face issues of excessive overload protection, leading to increased costs due to unnecessary extensive configurations, which is not appropriate for the operation of the system.
Innovation Solution
A transfer system with a processor that determines overload states in each drive unit and transfer path unit, implementing overload protection by lowering temperatures to prevent overheating and potential burnout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overload protection is designed for the worst-case scenario where rated current flows through all coils simultaneously, then the system can protect against extreme overload conditions, but the protection configuration becomes excessively extensive and costly
Solution Approach 1:
The patent applies local quality by determining overload states individually for each drive unit based on its specific operating conditions rather than applying a uniform worst-case protection threshold to all units. This allows the protection system to be tailored to local needs, avoiding unnecessary complexity in configurations where full overload protection is not required.
Solution Approach 2:
The patent implements dynamic overload determination by continuously monitoring the operating state of each drive unit and adjusting protection thresholds based on actual conditions. The processor dynamically evaluates whether each drive unit is in an overload state relative to its rated current, rather than using static worst-case thresholds, thereby adapting the protection level to real-time operational needs.
2Reliability
If overload protection is designed with extensive configuration for constant rated current flow through all coils, then the system can handle maximum theoretical load, but the cost of the transfer system increases unnecessarily
Solution Approach 1:
The patent applies partial action by implementing protection only where and when actually needed. Instead of providing full protection capacity for the theoretical worst-case scenario across all coils, the system provides partial protection tailored to the actual operating conditions of each drive unit, eliminating excessive protection capacity and associated costs.
Solution Approach 2:
The system uses self-service by having each drive unit monitor its own operating state and determine its own overload condition based on its specific rated current and actual current consumption. This self-determination approach eliminates the need for extensive centralized protection infrastructure, reducing system cost while maintaining adequate protection.
3Adaptability or versatility
If the system monitors and protects each drive unit individually based on actual operating conditions, then the overload protection becomes appropriate for real operations, but the control complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the protection control into independent modules for each drive unit. The processor determines overload states for each drive unit separately based on its specific operating conditions, allowing independent and simplified control logic for each segment rather than requiring complex centralized control for the entire system.
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
The system provides appropriate overload protection, preventing overheating and potential burnout, thereby maintaining system efficiency and reducing unnecessary costs.
Implementation Method 1
a magnet is disposed on the carrier as a mover, and coils are disposed on a stator constituting the transfer path. The moving magnet linear motor is suitable for moving the mover over a stroke longer than the length of the mover.
Implementation Method 2
the carrier is moved by the action of a magnetic field generated by passing a current to the coils
Implementation Method 3
the coils can be a source of heat due to a loss
Data Source
AI summary
A transfer system includes a plurality of transfer path units forming a transfer path on which one or a plurality of transferring bodies moves. Each of the plurality of the transfer path units includes a plurality of drive units that is energized to generate thrust for moving the transferring body, and a processor that determines whether or not each of the plurality of the drive units is in an overload state and also determines whether or not the transfer path unit is in the overload state. In each of the plurality of the transfer path units, the processor executes overload protection processing that lowers the temperature of the drive unit determined to be in the overload state or the temperature of the transfer path unit determined to be in the overload state.