Linear Motor Current Continuity for Low-Shock Stator Switching
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Solution Overview
Problem
The existing linear motor systems do not sufficiently reduce switching shocks caused by changes in speed during electric conduction switching due to limitations in data transfer between control devices for electric conduction switching compensation.
Innovation Solution
A linear motor system with a configuration that includes multiple stators and movers, where each control device calculates current command values based on speed integrated values and performs digital filter computations to ensure continuity of electric current, with a command generating unit coordinating the speed commands between control devices to minimize switching shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electric conduction switching compensation is performed using only speed integrated value transfer between control devices, then some switching shock reduction is achieved, but switching shocks are not sufficiently reduced
Solution Approach 1:
The invention performs preliminary actions by pre-calculating and storing multiple integrated values (speed integrated values, position integrated values, and acceleration values) before switching occurs. When switching between control devices, these pre-calculated values are transferred and used to generate smooth transition commands, preventing switching shocks before they occur rather than merely compensating after the fact.
Solution Approach 2:
The invention introduces intermediary elements in the form of multiple integrated values that act as mediators between the speed command input and the actual motor control output. These intermediate values (speed integrated value, position integrated value, acceleration value) smooth the transition during switching by providing continuous control data from both the current and next control devices, eliminating abrupt changes that cause switching shocks.
2Object-affected harmful factors
If multiple integrated values are transferred between control devices for comprehensive compensation, then switching shocks are sufficiently reduced, but data transfer complexity increases
Solution Approach 1:
The invention segments the control data into distinct components: speed integrated value, position integrated value, and acceleration value. Each segment serves a specific purpose in differentiating between forward and backward movements, allowing comprehensive switching shock reduction through targeted compensation for each movement type without requiring a completely complex unified control structure.
Solution Approach 2:
The invention changes parameters by transferring multiple integrated values (speed, position, acceleration) instead of a single value. This parameter expansion enables the system to distinguish between forward and backward movements and apply appropriate compensation, achieving sufficient switching shock reduction while maintaining manageable complexity through systematic parameter management.
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 effectively reduces switching shocks by maintaining continuity of electric current during transitions between stators, enhancing the control and stability of the motor system.
Implementation Method 1
a linear motor system includes stators having a plurality of armature winding units, a mover having a permanent magnet disposed with facing the stators
Data Source
AI summary
The control device in a linear motor system calculates a current command value for the stator based on a first speed integrated value obtained by integrating a speed deviation between a speed command for the mover and an actual speed of the mover, and performs first digital filter computation on the current command value. The control device calculates a current command value for the stator based on a second speed integrated value obtained by integrating a speed deviation between a speed command for the mover and the mover's actual speed, and performs second digital filter computation on the current command value. The current command calculating unit calculates a second speed integrated value based on the first speed integrated value used by the control device, and performs the second digital filter computation using a value of the first digital filter computation of the control device.