Pump Drive Power Conversion Control for Speed-Adaptive Fault Detection
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Solution Overview
Problem
Existing power conversion devices lack an efficient method for detecting abnormalities in driven objects, particularly in pressure feed systems, where changes in driving force amplitude with speed are not effectively monitored, leading to potential operational issues and incorrect abnormality detection.
Innovation Solution
A power conversion device with a control circuit that evaluates the amplitude of the driving force of a driven object, sets an amplitude threshold value profile based on the relationship between the amplitude and driving speed, and detects abnormalities when the amplitude exceeds the threshold, thereby improving detection sensitivity and reducing erroneous alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed threshold value is used for abnormality detection, then the detection method is simple, but the detection precision deteriorates because it cannot adapt to different driving speeds
Solution Approach 1:
The patent applies the dynamics principle by making the threshold value dynamic instead of fixed. The threshold value is set based on the driving speed of the driven object, allowing the detection system to adapt to different operating conditions. This resolves the contradiction by improving detection precision through speed-adaptive thresholds while maintaining relatively simple implementation through automated threshold calculation based on speed parameters.
Solution Approach 2:
The patent applies parameter changes by varying the threshold value parameter according to the driving speed parameter. Instead of using a constant threshold, the system adjusts the threshold parameter dynamically based on the operational speed, enabling accurate abnormality detection across different speed ranges without requiring complex manual calibration for each condition.
2Measurement precision
If the detection sensitivity is increased for low amplitude signals, then low-speed abnormality detection improves, but false alarms increase at high amplitudes
Solution Approach 1:
The patent applies local quality by implementing different detection characteristics for different operating conditions. Specifically, it sets different threshold values for different driving speed ranges, allowing high sensitivity for low-speed low-amplitude detection while maintaining appropriate thresholds for high-speed operations. This prevents false alarms at high amplitudes while preserving detection sensitivity for low amplitude signals at low speeds.
Solution Approach 2:
The patent changes the threshold parameter based on the driving speed parameter to resolve the contradiction between detection sensitivity and false alarm rate. By adjusting the threshold parameter dynamically, the system achieves high sensitivity when needed (low speeds) while preventing false alarms when not needed (high speeds with naturally higher amplitudes).
3Measurement precision
If multiple detection parameters are monitored, then detection accuracy improves, but the device complexity increases
Solution Approach 1:
The patent applies universality by making the detection system multi-functional through a single integrated approach. The control circuit performs multiple functions: it monitors driving speed, calculates appropriate threshold values, evaluates driving force amplitudes, and detects abnormalities - all within one unified detection mechanism. This improves detection accuracy through comprehensive monitoring while avoiding the complexity of multiple separate detection systems.
Data Source
AI summary
A power conversion device is provided, which includes a power conversion circuit configured to convert primary power to secondary power and supply the secondary power to a pump and a control circuit configured to cause the secondary power to follow a control command by the power conversion circuit the control circuit being configured to further execute evaluating, on the basis of the secondary power, an amplitude of a driving force of the pump, setting, on the basis of a relationship between an evaluation result of the amplitude and a driving speed of the pump, an amplitude threshold value profile indicating a relationship between an amplitude threshold value and the driving speed, and detecting an abnormality in the pump in response to the evaluation result of the amplitude exceeding the amplitude threshold value based on the amplitude threshold value profile.