Motor Control Parameter Setting via Load Machine Responsiveness Index
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Solution Overview
Problem
Existing motor control device setting assistance techniques primarily focus on motor shaft responses, neglecting the responsiveness of the load machine, which can result in overshooting and settling time issues for the load machine even if the motor shaft parameters are within acceptable ranges.
Innovation Solution
A setting assistance apparatus that uses information from a motor encoder to specify and present responsiveness index values for both the motor shaft and load machine, considering a multi-inertia model and frequency response characteristics to adjust control parameters effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If control parameters are set based on motor shaft response from encoder, then motor control precision is improved, but load machine responsiveness deteriorates
Solution Approach 1:
The patent introduces a responsiveness evaluation unit that acts as an intermediary to assess load machine responsiveness based on motor shaft response data. This intermediary component translates encoder measurements into predictions about load machine behavior, allowing the system to maintain precise motor control while evaluating and optimizing load machine performance through calculated responsiveness indices.
Solution Approach 2:
The patent replaces direct mechanical measurement of load machine response with a computational model that substitutes physical sensing with mathematical evaluation. The responsiveness evaluation unit uses algorithms to calculate responsiveness indices from motor shaft data, eliminating the need for direct mechanical sensors on the load machine while maintaining assessment accuracy.
2Loss of time
If control parameters are optimized for motor shaft performance, then motor shaft settling time is reduced, but load machine overshooting increases
Solution Approach 1:
The patent implements a feedback mechanism where the responsiveness evaluation unit continuously monitors motor shaft response and calculates responsiveness indices. This feedback loop allows the system to adjust control parameters to achieve an optimal balance between motor shaft settling time and load machine overshooting, using the calculated indices to guide parameter optimization rather than simply minimizing settling time.
Solution Approach 2:
The patent employs parameter changes by adjusting control parameters based on responsiveness index values rather than fixed optimization criteria. The system dynamically modifies control parameters to maintain load machine responsiveness within acceptable ranges while achieving acceptable motor shaft settling times, using multiple parameter adjustments to balance competing performance requirements.
Data Source
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AI summary
A device for assisting in setting that uses information from an encoder attached to a motor that drives a load machine to assist setting of a plurality of control parameters to a motor control device that controls the motor, comprising: for each of a plurality of states with mutually different values of a first control parameter among a plurality of control parameters, a specification unit that specifies a responsiveness index value indicating the responsiveness of the load machine when the motor control device controls the motor in that state; and a presentation unit that presents to a user the responsiveness index value for each of the plurality of states specified by the specification unit. This configuration makes it possible for the user to perform setting of control parameters to the motor control device in a form that considers the responsiveness of the load machine.