Voltage Transformation for Single-Phase Induction Motor Load Monitoring
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Solution Overview
Problem
Existing methods for transforming and analyzing voltages at the terminals of single-phase induction motors with permanent capacitors are inefficient due to long processing times and failure to consider alternating voltages directly, leading to incomplete load monitoring.
Innovation Solution
A method that transforms alternating voltages into image voltages using potentiometric dividers and voltage shift units, allowing for direct analog-digital conversion and efficient load determination by processing both positive and negative alternations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rectified and filtered voltages are used for transformation, then the voltage can be converted for analysis, but the processing time becomes long (at least one mains period)
Solution Approach 1:
The patent extracts only the necessary transformation function from the complex rectification and filtering process. By using a potentiometric divider to directly transform the alternating voltage into an image voltage suitable for ADC conversion, the method eliminates the time-consuming rectification and filtering stages while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces the mechanical/electrical process of rectification and filtering with a direct potentiometric transformation. This substitution allows the alternating voltage to be converted into a usable image voltage without undergoing the traditional multi-stage processing, thereby reducing processing time to well under one mains period.
2Ease of operation
If half-wave voltages are used for processing, then the voltage transformation can be performed, but the processing time cannot be less than the mains period
Solution Approach 1:
The patent processes both positive and negative alternations of the alternating voltage simultaneously through the potentiometric divider. This continuous processing of the full wave form, rather than waiting for half-wave completion, enables the transformation to be completed in less than one mains period while maintaining operational simplicity.
3Measurement precision
If voltage amplitudes are combined instead of alternating voltages, then the analysis can be performed, but incomplete load monitoring occurs
Solution Approach 1:
Instead of combining voltage amplitudes and then analyzing, the patent inverts the approach by directly transforming the alternating voltages themselves into image voltages that preserve the temporal and amplitude information. This allows the ADC to capture the complete voltage waveform characteristics, enabling accurate detection of load variations including stops and obstacles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables rapid and accurate monitoring of motor loads, reducing processing time and improving the precision of load determination by considering both positive and negative alternations, thus enhancing the efficiency of motor control and load analysis.
Implementation Method 1
each of which consists of two resistors in series with one another and with a voltage source
Implementation Method 2
A DC voltage generator is connected in series between the midpoint of the two resistors and the analog input of the converter and presents a direct voltage component
Data Source
Figure 1~4
Figure 5~7
AI summary
The method involves applying initial voltages (U1, U2) respectively at terminals of windings (W1, W2) without rectifying the initial voltages and with a ratio potentiometric divider. Each of the initial voltages at terminals of the windings are divided by constant ratios, and one of positive direct components (E1, E2) is added at the divided initial voltages such that the initial voltages are transformed at the terminals of the windings by an affine function. Independent claims are also included for the following: (1) a method for determining a load of a permanent condenser and induction single-phase electric motor of an actuator that controls a mobile load of a home automation installation (2) a device for determining a load of a permanent condenser and induction single-phase electric motor of an actuator that controls a mobile load of a home automation installation, comprising an initial voltage transformation device.