PMSM Speed and Position Estimation Using Flux Voltage Feedback
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Solution Overview
Problem
Existing motor control systems, particularly those using Field-Oriented Control (FOC) for Permanent Magnet Synchronous Motors (PMSMs), face challenges in efficiently estimating motor position and speed without computationally intensive techniques, which can increase complexity and cost, and are affected by motor resistance variations due to temperature changes.
Innovation Solution
A method and apparatus for motor control that estimates motor position and speed using a feedback flux generating voltage parameter, determined from three-phase motor current measurements, allowing for reduced computational complexity and improved efficiency by avoiding intensive transforms and dynamically accounting for motor resistance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If computationally intensive techniques are used for motor position and speed estimation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameters used for estimation from requiring complex transforms to using direct voltage and current measurements with simplified calculations. By using the feedback flux generating voltage parameter and demand flux generating voltage parameter directly in comparison, the system achieves accurate position and speed estimation without computationally intensive transforms, thereby reducing device complexity while maintaining measurement precision.
2Measurement precision
If computationally intensive transforms are used, then measurement precision is improved, but processing time increases
Solution Approach 1:
The patent extracts the essential information needed for position and speed estimation directly from the voltage and current measurements without performing complex transforms. By taking out only the necessary flux generating voltage parameter and comparing it with the demand parameter, the system eliminates unnecessary computational steps, thereby reducing processing time while maintaining estimation accuracy.
3Productivity
If traditional FOC control is used, then motor control efficiency is maintained, but robustness against temperature variations deteriorates
Solution Approach 1:
The patent implements feedback by continuously monitoring the feedback flux generating voltage parameter and comparing it with the demand flux generating voltage parameter. This feedback mechanism allows the system to dynamically adjust and maintain accurate position and speed estimation despite temperature-induced resistance variations, thereby improving robustness while maintaining motor control efficiency through the simplified estimation approach.
Data Source
AI summary
According to some embodiments, method for controlling a motor comprises generating a drive signal for the motor, the drive signal comprising a demand flux generating voltage parameter. A feedback torque generating current parameter and a feedback flux generating current parameter are determined based on a three-phase motor current measurement. A feedback flux generating voltage parameter is determined based on the feedback torque generating current parameter and the feedback flux generating current parameter. An estimated motor position and an estimated motor speed are determined based on the feedback flux generating voltage parameter and the demand flux generating voltage parameter. The drive signal is generated based on the estimated motor position and the estimated motor speed.