Phase Angle Estimation via Multi-Set Coil Pulse Voltages
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Solution Overview
Problem
Existing phase angle estimation methods for synchronous motors suffer from noise interference due to pulse voltages applied for estimating the phase angle, which affects accuracy and motor performance.
Innovation Solution
A phase angle estimation apparatus that applies first, second, and third pulse voltages with different directions to multiple sets of coils, acquiring current vectors from these applications, and estimating the phase angle based on these vectors, thereby minimizing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pulse voltages are applied to estimate phase angle, then phase angle estimation is enabled, but noise interference increases and accuracy decreases
Solution Approach 1:
The patent divides the coil system into N sets of coils with respective drive systems, allowing independent control and measurement. By segmenting the measurement process across multiple coil sets and applying pulse voltages at different timings, the system can isolate and cancel noise components through differential measurement, thereby improving phase angle estimation accuracy while reducing noise interference.
Solution Approach 2:
The patent applies first, second, and third pulse voltages at different timings to the N sets of coils in a periodic sequence. This periodic application allows the system to capture current vectors at multiple time points and use temporal differentiation to distinguish between useful signal components and noise, enabling accurate phase angle estimation despite the presence of pulse-induced noise.
2Object-affected harmful factors
If multiple sets of coils with different pulse voltage directions are applied, then noise interference is reduced, but device complexity increases
Solution Approach 1:
The patent designs N sets of coils where each set has its own drive system but all sets share the same measurement and control architecture. This universal design allows the system to perform multiple measurement functions simultaneously using the same hardware resources, reducing noise through diversity while avoiding proportional increases in overall system complexity.
Solution Approach 2:
The patent combines the measurement functions of N sets of coils into a unified phase angle estimation process. By merging the current vectors from multiple coil sets and processing them through a single estimation algorithm, the system achieves noise reduction through signal integration while maintaining a relatively simple overall device structure.
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
The solution effectively reduces noise and enhances the accuracy of phase angle estimation, improving motor performance and efficiency by suppressing disturbances caused by pulse voltages.
Implementation Method 1
apply first pulse voltages, apply second pulse voltages at a timing different from a timing at which the first pulse voltages are applied, and apply third pulse voltages at a timing different from timings at which the first and the second pulse voltages are applied, to the respective N sets of coils
Implementation Method 2
estimating unit configured to estimate the phase angle on the basis of the first, the second and the third current vectors
Data Source
AI summary
At least one of conditions are satisfied, the conditions are a condition that directions of vectors of N sets of first pulse voltages are different from each other, a condition that directions of vectors of N sets of second pulse voltages are different from each other, and a condition that directions of vectors of N sets of third pulse voltages are different from each other. Further, periods in which voltages having different directions of the vectors among the N sets of the first, the second and the third pulse voltages, are applied at least partially overlap with each other.