Motor Control Vibration Suppression via Adaptive Filter
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Solution Overview
Problem
Existing motor control systems face challenges in quickly and accurately adapting to changes in vibration characteristics, often leading to unstable motor control due to delayed suppression of target vibrations and unintended suppression of non-target components.
Innovation Solution
A motor control device equipped with an acceleration detecting section and an acceleration control section that includes a vibration component extraction filter, which adjusts its filter characteristic frequency based on the position and mass of the control object to effectively extract and suppress vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed filter characteristic frequency is used for vibration suppression, then the control system is simple and stable, but the vibration suppression function cannot adapt quickly to changes in vibration characteristics
Solution Approach 1:
The filter characteristic frequency is made dynamically adjustable based on the detected vibration frequency. The acceleration control section modifies the filter characteristic frequency according to the vibration frequency detected by the acceleration detector, allowing the system to adapt to changing vibration characteristics without requiring a completely complex reconfiguration mechanism.
Solution Approach 2:
The system changes the parameter (filter characteristic frequency) based on detected vibration conditions. When vibration frequency is detected, the filter characteristic frequency is adjusted to match, enabling effective vibration suppression while maintaining system simplicity through parameter adaptation rather than structural complexity.
2Measurement precision
If the filter characteristic frequency is adjusted to match vibration frequency, then vibration suppression accuracy improves, but the risk of suppressing non-target components increases
Solution Approach 1:
The system uses feedback from the acceleration detector to continuously monitor vibration frequency and adjusts the filter characteristic frequency accordingly. This closed-loop feedback mechanism ensures that suppression is targeted at actual vibration frequencies while preventing unintended suppression of non-vibrating components through continuous adaptation.
Solution Approach 2:
The vibration suppression is applied locally and selectively at the frequency where vibration is detected, rather than applying broad-spectrum suppression. The filter characteristic frequency is adjusted to target specifically the detected vibration frequency, ensuring precise local suppression without affecting other frequency components.
3Productivity
If acceleration feedback control is used for vibration suppression, then low frequency vibration suppression improves, but processing time increases and control stability may deteriorate
Solution Approach 1:
The vibration component is extracted from the acceleration signal using a filter with adjusted characteristic frequency, separating the vibration component from other signal components. This extraction allows focused suppression of only the vibration portion without processing the entire acceleration signal, reducing unnecessary processing time while maintaining effectiveness.
Data Source
AI summary
A motor control device includes an acceleration detecting section configured to detect an acceleration of a control object, and an acceleration control section configured to control an acceleration of a motor driving the control object based on the detected acceleration, in which the acceleration control section includes a vibration component extraction filter configured to extract a vibration component generated between the motor and the control object, and the vibration component extraction filter changes a filter characteristic frequency according to at least one of a position and a mass of the control object.