State estimation device, drive system, refrigeration system, fan system, state estimation method, and state estimation program
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Solution Overview
Problem
Existing state estimation methods for devices with motors are prone to erroneous estimations due to unintended variations in feature quantities, particularly when the motor's rotational state changes, leading to inaccurate diagnosis of abnormalities.
Innovation Solution
A state estimation device that includes a control unit to perform calculation, estimation, and restriction processes, where the estimation process is restricted based on predetermined conditions and released only when stabilized, using frequency components as feature quantities to minimize erroneous estimations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the estimation process continuously monitors feature quantities to detect abnormalities, then the detection capability is improved, but erroneous estimations occur when the motor's rotational state changes causing unintended variations in feature quantities
Solution Approach 1:
The patent applies preliminary anti-action by detecting the motor's rotational state changes in advance and proactively restricting the estimation process before erroneous estimations can occur. The control unit monitors rotation state and preemptively suspends abnormality detection when rotational changes are detected, preventing the feature quantity variations caused by rotation changes from being misinterpreted as abnormalities.
Solution Approach 2:
The patent implements dynamics by making the estimation process adaptive to the motor's operational state. The control unit dynamically adjusts the estimation process based on real-time detection of rotational state changes, restricting estimation during rotation transitions and resuming it when the motor reaches a stable rotational state, thereby optimizing detection accuracy across varying operating conditions.
2Measurement precision
If the estimation process is restricted to prevent erroneous estimations during motor rotation changes, then measurement precision is improved, but the detection response time increases due to temporary suspension of estimation
Solution Approach 1:
The patent applies periodic action by implementing cyclic monitoring of the motor's rotational state and periodically alternating between restriction and resumption of the estimation process. The control unit continuously monitors rotation state, temporarily restricts estimation during rotation changes, and resumes it after a predetermined period once stability is confirmed, creating a rhythmic pattern of detection that balances accuracy and responsiveness.
3Reliability
If the control unit continuously monitors rotational state to manage estimation restriction, then the reliability of estimation is improved, but the device complexity increases due to additional monitoring and control logic
Solution Approach 1:
The patent applies universality by designing the control unit to perform multiple functions: it simultaneously executes the estimation process for abnormality detection, monitors the motor's rotational state, determines when restriction should be applied, and manages the resumption of estimation. This multi-functional approach consolidates what could be separate complex subsystems into a single integrated control unit, reducing overall system complexity while maintaining high reliability.
Data Source
AI summary
In a calculation process, a control unit calculates a feature quantity from a physical quantity obtained from a device within a predetermined period. In an estimation process, the control unit estimates the state of the device, based on the feature quantity calculated by the calculation process. In a restriction process, the control unit restricts the estimation process when an estimation restriction condition is satisfied, maintains restriction of the estimation process until a standby release condition is satisfied when a restriction release condition is satisfied, and releases the restriction of the estimation process after the standby release condition is satisfied. The estimation restriction condition is a condition in which there is a possibility of occurrence of erroneous estimation in the estimation process. The restriction release condition is a condition in which the erroneous estimation in the estimation process is suppressed.