Electromagnetic Pinning Control for Linear Mover Position Holding
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Solution Overview
Problem
Existing motion control systems in linear drive systems face challenges in maintaining the precise position of movers without mechanical coupling, as they are prone to movement due to external disturbances, electronic noise, and position drift, which can lead to overheating and damage, and require complex and costly mechanical structures or inefficient motor control routines.
Innovation Solution
A control system that utilizes electromagnetic pinning by regulating the current in the linear drive system's coils to maintain the mover's position, using a d-q reference frame to manage forces and resist external disturbances, eliminating the need for mechanical coupling and reducing noise sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a mechanical structure is used to lock the mover in place, then the mover position stability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical locking structures with an electromagnetic field-based control system. The controller regulates current in the coils to generate electromagnetic forces that counteract external disturbances and maintain mover position, eliminating the need for mechanical pins, linkages, or other physical locking mechanisms.
Solution Approach 2:
The system dynamically adjusts electrical parameters (current magnitude and phase) in response to detected position deviations or disturbance forces. By changing the current parameters supplied to the coils, the electromagnetic force is modulated to maintain position stability without mechanical intervention.
2Stability of the object's composition
If a mechanical structure is used to lock the mover in place, then the mover position stability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent replaces mechanical locking structures with an electromagnetic field-based control system. The controller regulates current in the coils to generate electromagnetic forces that counteract external disturbances and maintain mover position, eliminating the need for mechanical pins, linkages, or other physical locking mechanisms.
3Device complexity
If the motor control routine is used to maintain mover position, then the mechanical structure is simplified, but the system reliability decreases due to overheating and damage risks
Solution Approach 1:
The system continuously monitors mover position and uses this feedback to adjust the current supplied to the coils. The controller detects position deviations caused by external disturbances and dynamically modifies the electromagnetic force to counteract these disturbances, maintaining position stability without excessive current buildup.
Solution Approach 2:
The system proactively applies electromagnetic forces to counteract external disturbance forces before they can cause significant position deviations or damage. By detecting or anticipating disturbance forces (such as gravity on inclined tracks or forces from external actuators), the controller pre-adjusts the current to prevent problematic situations.
4Stability of the object's composition
If the mover is held at a fixed position using conventional control, then the position is maintained, but the system is sensitive to electronic noise and position drift
Solution Approach 1:
The system continuously monitors mover position and uses this feedback to adjust the current supplied to the coils. The controller detects position deviations caused by external disturbances and dynamically modifies the electromagnetic force to counteract these disturbances, maintaining position stability without excessive current buildup.
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 effectively holds the mover at a desired position with improved precision and reduced risk of overheating or damage, eliminating the need for mechanical structures and enhancing system reliability and efficiency.
Implementation Method 1
The track is made up of a number of track segments that, in turn, hold individually controllable electric coils. Successive activation of the coils establishes a moving electromagnetic field that interacts with the movers and causes the mover to travel along the track.
Implementation Method 2
A control system that utilizes electromagnetic pinning by regulating the current in the linear drive system's coils to maintain the mover's position, using a d-q reference frame to manage forces and resist external disturbances.
Data Source
Figure 1
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AI summary
A system and method for holding position of a mover in an independent cart system includes receiving a current feedback signal corresponding to a current present in at least one coil for a linear drive system in the independent cart system. A motion command for the mover is received, where the motion command defines a desired position along a track of the independent cart system to which the mover is to travel. An electromagnetic pinning control mode is disabled while controlling operation of the at least one mover to the desired position and enabled when the at least one mover is at the desired position.