Long Stator Linear Motor Thermal Management
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Solution Overview
Problem
Long stator linear motor systems experience excessive thermal loading due to simultaneous acceleration or deceleration of multiple movement devices at specific points, leading to reduced service life, overheating, and performance issues, while short stator systems face similar problems with continuous acceleration operations.
Innovation Solution
The method involves portion-wise varying the magnetic field generation along a predetermined functional region of the long or short stator linear motor system to distribute thermal loading uniformly across multiple portions, reducing peak heat generation and extending system lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple movement devices are accelerated or decelerated at the same point in the long stator linear motor system, then the movement devices can be operated with the same speed profile and simplified control, but excessive thermal loading occurs at specific regions of the long stator leading to reduced service life and performance issues
Solution Approach 1:
The long stator is divided into multiple independently controllable regions or modules along its length. Each segment can generate magnetic fields independently, allowing the system to distribute acceleration and deceleration operations across different segments rather than concentrating them at a single point. This segmentation enables thermal load distribution while maintaining coordinated control of multiple movement devices.
Solution Approach 2:
The system dynamically adjusts which stator segments are active and when, based on the positions and operational requirements of movement devices. Instead of using a fixed acceleration point, the system can shift acceleration zones along the stator length, creating dynamic thermal load distribution patterns that prevent excessive heating at any single location.
2Power
If the long stator linear motor system operates with high power requirements for acceleration and deceleration, then the movement devices can achieve the required speed profiles, but large heat development occurs reducing service life and causing emergency shut-offs
Solution Approach 1:
The stator is segmented into multiple zones that can be activated independently. During acceleration and deceleration operations, the system distributes the high power demands across multiple segments rather than concentrating them in one location. This allows the thermal energy to be dispersed throughout the stator structure, preventing localized overheating and extending service life.
Solution Approach 2:
The system employs periodic or alternating activation of different stator segments during operation. By cycling which segments are active and when, the system can maintain high power output for movement device acceleration while allowing individual segments to cool down during their inactive periods, thus preventing cumulative thermal damage.
3Speed
If short stator linear motor systems continuously energize the short stator for acceleration operations, then the movement devices can be accelerated as needed, but the short stator heats to an undesirably strong degree
Solution Approach 1:
The short stator is divided into multiple smaller sub-segments that can be activated independently. Instead of continuously energizing the entire short stator, the system activates only the specific sub-segments needed for current acceleration operations. This reduces the overall thermal load on the short stator while maintaining the required acceleration capability.
Solution Approach 2:
The system applies magnetic field generation locally only where and when needed, rather than uniformly across the entire short stator. By concentrating magnetic field generation in specific local regions corresponding to the positions of movement devices, the system achieves necessary acceleration while minimizing overall thermal generation in the short stator.
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 approach prevents overheating, prolongs motor service life, enhances performance, and allows for a smaller motor design by distributing thermal loading evenly, thus reducing the risk of emergency shut-offs and maintaining consistent operation.
Implementation Method 1
A long stator of the linear motor system has, along a portion of the guide track, a predetermined (for example in terms of control) functional region (for example positive or negative acceleration region or speed-maintaining region) in which a function assigned to the predetermined functional region is carried out with respect to influencing the plurality of transport movement devices. The method comprises portion-wise varying of a magnetic field generation of the long stator (for example by portion-wise different energization of the long stator) within the predetermined functional region
Implementation Method 2
A current development trend in the transport of containers, such as for example bottles or cans, in installations and machines for the production, filling and packaging of beverages and liquid foodstuffs is the linear motor technique, for example in the form of long stator linear motor systems or short stator linear motor systems
Data Source
AI summary
A device and a plurality of methods for transporting are disclosed. One method includes moving a plurality of transport movement devices (14) along a guide track (22) by use of a linear motor system. A long stator (16) of the linear motor system has, along a portion of the guide track (22), a predetermined functional region. The method includes portion-wise varying of a magnetic field generation of the long stator (16) within the predetermined functional region (46) for successive transport movement devices of the plurality of transport movement devices (14). It is thus possible to achieve various advantages, such as for example prolonging the motor service life, preventing emergency shut-offs, increased performance of the long stator linear motor and/or allowing smaller dimensioning of the long stator (16).