Linear Motor Coil Switching With Delay-Corrected Position Deviation
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Solution Overview
Problem
The existing linear motor control system experiences a reduction in position control accuracy due to communication delays between control deviation calculators and position controllers, leading to inconsistent deviation information across multiple position controllers.
Innovation Solution
A linear motor system with a stator and mover configuration, including a switcher that selects and switches power supply target coils based on the movement of a permanent magnet, and control units that calculate and transmit position deviations to ensure synchronization across control units, using a correction calculation to maintain consistent position deviation information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deviation information is transmitted between control units, then position control can be maintained across multiple controllers, but communication delays cause inconsistency in deviation information and reduce position control accuracy
Solution Approach 1:
The patent applies preliminary action by having the transmitting control unit send deviation information to the receiving control unit before the receiving unit would otherwise calculate its own deviation. The receiving unit then uses this pre-transmitted deviation information along with a correction value to maintain accurate position control, effectively acting in advance to prevent the inconsistency that would otherwise occur due to communication delays.
2Productivity
If multiple control units operate independently, then each controller can control its associated coils, but deviation information becomes inconsistent across controllers reducing overall position control accuracy
Solution Approach 1:
The patent implements feedback by having control units transmit their calculated deviation information to other control units. The receiving control units use this feedback information, combined with correction values based on movement direction and distance, to adjust their own deviation calculations. This feedback mechanism ensures that all control units maintain consistent deviation information despite operating independently, thereby preserving position control accuracy across 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
This configuration effectively suppresses the reduction in position control accuracy by ensuring consistent position deviation calculations across control units, even with communication delays, thereby enhancing the overall accuracy of position control.
Implementation Method 1
a stator including a plurality of coils that are arranged in a line; a mover including a permanent magnet disposed opposite to the plurality of coils
Data Source
AI summary
A linear motor system includes: a stator including first to tenth coils; a mover including a permanent magnet; a switcher that switches one or more power supply target coils; and first to tenth amplifiers provided in one-to-one correspondence with first to tenth coils. One or more amplifiers that serve as new one or more power supply target amplifiers immediately after the switching calculate Δθ (t0), which is a position deviation at time t=t0, based on Δθ (t0)=Δθ (t0−td)+A−B, where A is a difference between an instructed position at time t=t0 and an instructed position at time t=t0−td, and B is a difference between an actual position at time t=t0 and an actual position at time t=t0−td, and supply power to the power supply target coils by the position deviation Δθ (t0).