Long-Stator Linear Motor Transport Control for Curve Load Limits
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Solution Overview
Problem
Conventional transport devices, such as continuous conveyors, lack flexibility and fail to account for varying kinematic conditions experienced by objects on transport units, particularly in curves, leading to potential damage or inefficiencies when handling sensitive goods or tools.
Innovation Solution
A method for controlling transport units in long-stator linear motors by determining a relative movement profile for a point connected to the unit, allowing for adaptation of the movement profile based on the kinematics of the object, ensuring adherence to predetermined dynamic and kinematic limits, even when the object experiences different conditions than the reference point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a movement profile is predetermined for a reference point of the transport unit, then the transport unit can be controlled along the transport path, but the object on the transport unit experiences different kinematic conditions (especially in curves) leading to potential damage or inefficiencies
Solution Approach 1:
The patent applies local quality by differentiating between the reference point on the transport unit and the relative point on the object. The control system calculates separate movement profiles for each point, allowing the reference point to follow a standard path while the relative point's trajectory is optimized to account for local kinematic conditions such as centrifugal forces in curves. This ensures that sensitive objects experience reduced loads while the transport unit maintains its operational control.
2Productivity
If the transport unit moves at high speed to improve productivity, then output increases, but the object experiences excessive centrifugal forces and dynamic loads
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the movement profile parameters (speed, acceleration, jerk) based on the object's characteristics and position. The control system calculates the relative point's trajectory and modifies the movement parameters in real-time to keep centrifugal forces and dynamic loads within acceptable limits. This allows the system to maintain high productivity while protecting sensitive objects from excessive loads.
3Device complexity
If a standard movement profile is used for all transport units, then control is simplified, but individual regulation of each transport unit's movement is not possible
Solution Approach 1:
The patent applies preliminary action by pre-calculating the relative point's trajectory and determining the appropriate movement profile adjustments before the transport unit begins its journey. The control system uses the object's characteristics, position on the transport unit, and transport path geometry to compute the customized movement profile in advance. This approach enables individual regulation of each transport unit without requiring complex real-time adjustments during transport.
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 ensures that the movement profile of the transport unit is optimized for the object, preventing excessive loads and maintaining precise control, thereby protecting sensitive goods and improving operational efficiency.
Implementation Method 1
The drive coils generate a moving magnetic field which interacts with the excitation magnets on the transport units in order to move the transport units
Data Source
AI summary
In order to specify a method for controlling a transport unit (TE) of a transport device (1) in the form of a long-stator linear motor, said method allowing safe transport of an object (O) without exposing the object (O) to critical movement limit values, the invention provides that a movement profile of the transport unit (TE) is established at least in sections along the transport path (2) depending on a relative movement profile of a relative point (PR) connected to the transport unit (TE) and spaced at a distance from a reference point (PT) of the transport unit (TE).