Three-Phase Angle Detection Using Modified CORDIC Algorithm
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Solution Overview
Problem
Existing methods for calculating the phase shift or amplitude of an electromagnetic three-phase system are complex and require additional calculation steps to determine the quadrant of the magnetic field vector, which complicates the process.
Innovation Solution
A simplified method using three sensors arranged at the same angle on a circular line to detect vector values shifted by 0°, 120°, and 240°, with an iterative Cordic method to calculate the phase shift or amplitude, and optionally using six sensors at 60° intervals to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Clarke transformation is used to convert three-phase data to rectangular coordinate system, then the rotation angle can be calculated, but an additional calculation step is required to determine the quadrant of the magnetic field vector
Solution Approach 1:
The patent extracts and eliminates the problematic quadrant determination step from the Clarke transformation process. By using six Hall sensors arranged at 60° intervals and applying a modified CORDIC algorithm, the method directly calculates the angle without needing to separately determine quadrants, thus removing the source of complexity while maintaining calculation accuracy.
Solution Approach 2:
The patent changes the sensor arrangement parameters from the traditional three-sensor 120° configuration to a six-sensor 60° configuration. This parameter change enables the system to obtain magnetic field information from multiple directions simultaneously, allowing direct angle calculation through iterative CORDIC method without quadrant determination steps.
2Measurement precision
If six sensors are used arranged at 60° intervals on a circular line, then angular resolution and accuracy are improved, but the number of sensors and device complexity increases
Solution Approach 1:
The patent segments the magnetic field detection task into six discrete sensing points arranged at 60° intervals around the circular path. Each sensor captures magnetic field information from a specific angular position, and the combined data from all six sensors provides comprehensive angular information with high resolution, enabling precise angle calculation through the iterative process.
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 simplifies the calculation of phase shift or amplitude, reducing computational complexity and enabling efficient angle detection in systems like brushless electric motors with improved angular resolution and robustness against incorrect quadrant decisions.
Implementation Method 1
The angle sensor has eight horizontal Hall sensor structures on a semiconductor substrate
Data Source
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AI summary
A method for calculating the phase shift of an electromagnetic three-phase system is disclosed. This method comprises the following steps: acquiring vector values corresponding to an electromagnetic quantity by three sensors that essentially provide a signal shifted by 0°, 120°, and 240°; calculating modified vector values by logically reversing one of the acquired vector values to a phase angle of 0°; and iteratively calculating the phase shift of the three-phase system using the modified vector values.