Salient Motor Flux Map Refinement for Accurate Torque Control
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Solution Overview
Problem
Existing flux mapping methods for salient motors are inadequate for high-performance control and accurate torque calculation.
Innovation Solution
An iterative method and apparatus for flux map identification that applies an initial voltage to a salient motor, followed by iteratively applying a variable voltage with a constant current change to refine the flux map, enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an initial voltage is applied to generate a flux map, then flux mapping is achieved, but the accuracy is insufficient for high-performance control
Solution Approach 1:
The patent implements an iterative feedback process where the flux map is continuously refined. The controller applies variable voltage based on the current flux map, measures the resulting current change, and uses this feedback to update and improve the flux map in subsequent iterations, progressively enhancing flux estimation accuracy
Solution Approach 2:
The patent changes the voltage application strategy from a static initial voltage to a dynamic variable voltage that varies across iterations. The voltage magnitude and duration are adjusted based on the flux map refinement stage, allowing optimal excitation for different levels of precision requirements
2Measurement precision
If existing flux mapping methods are used, then the process is simple, but the flux quantification is imprecise
Solution Approach 1:
The flux mapping process is segmented into multiple discrete iterations, each focusing on refining specific aspects of the flux map. The process divides the complex task of accurate flux quantification into manageable steps: initial mapping, iterative refinement with variable voltage, and convergence validation
Solution Approach 2:
The patent performs a preliminary initial flux mapping before the iterative refinement process. This preliminary action establishes a baseline flux map that guides the subsequent variable voltage application, making the overall process more systematic and manageable
3Measurement precision
If variable voltage is iteratively applied to refine the flux map, then flux mapping accuracy improves, but the process time increases
Solution Approach 1:
The patent applies partial action by performing a limited number of iterative refinements rather than continuing indefinitely. The process stops when convergence criteria are met or a predetermined maximum number of iterations is reached, balancing accuracy improvement against time consumption
Solution Approach 2:
The flux map refinement employs periodic action through discrete iterative cycles. Each iteration consists of a complete cycle: apply variable voltage, measure current change, update flux map. This periodic structure allows systematic progression toward accuracy while maintaining controllable timing
Data Source
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AI summary
For flux map identification, a method applies an initial voltage to a motor. The motor is a salient motor. The method generates a flux map for the motor. The method iteratively applies a variable voltage to the motor. The variable voltage includes a constant current change calculated from the flux map. The method iteratively modifies the flux map.