Clocked Motor Measurement Using Adaptive Integration Windows
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Solution Overview
Problem
Clocked systems face challenges in recording measured values, especially in DC motor control, due to speed-dependent interference signals and limitations of conventional methods like analog filters, which are static and cannot be adjusted during operation, and sample and hold elements that are strained by continuous control changes and varying interference signals.
Innovation Solution
A method that determines measured values by separating integration periods into control and non-control phases, using digital and analog integration/summation methods, and accounting for system parameters like inertia and time delays to adapt measurement processes dynamically, allowing precise recordings during both activation and non-activation periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods with analog filters are used to measure regenerative after-running voltage, then the measurement system is simple to implement, but the measurement precision deteriorates due to large speed-dependent interference signal components
Solution Approach 1:
The patent applies dynamics by making the integration periods adaptive rather than fixed. The measurement system dynamically adjusts the integration periods based on the clocked control signal, switching between first integration periods during control periods and second integration periods during non-control periods. This dynamic adaptation allows the system to optimize measurement precision across different operating conditions while managing complexity through structured temporal segmentation.
Solution Approach 2:
The patent segments the measurement process into distinct time periods corresponding to control and non-control periods of the clocked control signal. By dividing the measurement into first integration periods and second integration periods, the system can apply different integration strategies for different phases, reducing the impact of speed-dependent interference components and improving overall measurement precision.
2Speed
If sample and hold elements are used to improve measurement response, then the response speed is improved, but the measurement precision deteriorates when control changes continuously or interference signals are superimposed
Solution Approach 1:
The patent employs periodic action by synchronizing the integration periods with the periodic clocked control signal. The measurement system performs integration during specific periods (first integration periods during control periods, second integration periods during non-control periods) in a repeating cycle. This periodic measurement approach maintains response speed while improving precision by systematically avoiding periods with high interference.
Solution Approach 2:
The patent applies preliminary action by pre-defining multiple integration periods (first and second integration periods) with different characteristics before actual measurement begins. The system selects and applies the appropriate integration period based on the current phase of the clocked control signal, allowing optimal measurement parameters to be prepared in advance for different operating conditions.
3Adaptability or versatility
If integration periods are fixed, then the device complexity is low, but the adaptability deteriorates when motor load and speed vary
Solution Approach 1:
The patent achieves adaptability through dynamic selection of integration periods based on the clocked control signal state. The system automatically switches between first integration periods (during control periods) and second integration periods (during non-control periods) without requiring complex external adjustment mechanisms. This dynamic behavior provides adaptability to varying motor load and speed conditions while keeping device complexity manageable through systematic temporal division.
Data Source
AI summary
The invention relates to a method for determining measured values in a system (101) driven in clocked fashion, wherein the clocking has driving periods in which the system (101) is driven and non-driving periods in which the system (101) is not driven, said method having the following steps: determining (102.1) first integration periods on the basis of the clocking, wherein the first integration periods are within at least one of the driving periods and/or determining (102.2) second integration periods on the basis of the clocking, wherein the second integration periods are within at least one of the non-driving periods; detecting (103) a measurement variable of the system (101), which measurement variable depends on the driving; determining (104) summation and/or integration values by summing and/or integrating the measurement variable during the first and/or second integration periods; determining (105) the measured value for at least one of the driving periods and/or non-driving periods on the basis of time data for the first and/or second integration periods and on the basis of the summation and/or integration values determined.