Rotation Angle Detection with Automatic Gain Adjustment
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Solution Overview
Problem
Existing rotation angle detecting apparatuses face inaccuracies due to manufacturing variations in magnetic pieces and hall sensors, leading to errors in angle detection, particularly due to uneven production and mechanical tolerances.
Innovation Solution
A method and apparatus that utilize multiple hall elements to detect magnetic values, adjust gain based on difference values between measured magnetic values, and re-detect rotation angles until a delta value threshold is met, ensuring accurate angle detection by compensating for manufacturing deviations and mechanical tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manufacturing variations in magnetic pieces and hall sensors are present, then production cost and ease of manufacture are improved, but measurement precision deteriorates due to errors in angle detection
Solution Approach 1:
The patent applies preliminary action by performing gain calibration before actual angle measurement operations. The system pre-determines gain values for each hall sensor by measuring magnetic field values at known reference positions, storing these calibration parameters for subsequent use. This preliminary calibration step compensates for manufacturing variations before they affect measurement precision during normal operation.
Solution Approach 2:
The patent changes the parameter of gain values for each hall sensor based on measured magnetic field characteristics. By adjusting the gain parameters individually for each sensor according to its specific manufacturing variations, the system compensates for parameter deviations caused by manufacturing tolerances, thereby maintaining high measurement precision without requiring perfect uniformity in production.
2Measurement precision
If gain adjustment based on magnetic value differences is performed, then measurement precision is improved, but device complexity increases due to additional calculation and iteration steps
Solution Approach 1:
The patent implements feedback by using the measured magnetic field values to adjust gain parameters, then using these adjusted gains to recalculate angle measurements. The system continuously compares measured values with calculated values and refines the gain parameters through iterative feedback loops, improving measurement precision through self-correction mechanisms.
Solution Approach 2:
The patent applies partial action by performing gain adjustment only for specific hall sensors that show significant deviations in their magnetic field measurements. Rather than uniformly adjusting all sensors, the system selectively applies gain correction to those needing it, reducing unnecessary computational complexity while still achieving the required measurement precision.
3Measurement precision
If multiple iterations of angle re-detection are performed to reduce error, then measurement precision is improved, but loss of time increases due to repeated detection cycles
Solution Approach 1:
The patent performs preliminary gain calibration during an initialization phase before actual angle detection begins. By pre-determining the optimal gain values for each sensor, the system eliminates the need for repeated iterative adjustments during normal operation, thereby improving measurement precision without incurring continuous time penalties during actual use.
Solution Approach 2:
The patent applies partial iteration by performing multiple detection cycles only when necessary, such as during initial calibration or when significant errors are detected. For normal operation, the system uses the pre-calibrated gain values directly, reducing time loss while maintaining precision through selective rather than continuous iteration.
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 achieves precise rotation angle detection by iteratively adjusting gain and re-detecting angles, thereby minimizing errors caused by manufacturing variations and mechanical tolerances, resulting in improved accuracy and reliability.
Implementation Method 1
at least one hall sensor is disposed nearby. The apparatus may calculate a relative rotation angle of a magnet with respect to a sensor by detecting changes in a magnetic field based on detecting a relative motion between a magnet and a sensor
Data Source
AI summary
A rotation angle detecting method includes detecting a first rotation angle based on a first measured magnetic value received from a first hall element, detecting a first magnetic value received from a second hall element corresponding to the first detected rotation angle, adjusting a gain based on a first difference value between a second measured magnetic value received from the second hall element, in response to one of the magnetic pieces being rotated at the first rotation angle, and the first magnetic value, redetecting a second rotation angle by applying the gain to the first magnetic value and redetecting a second magnetic value received from the second hall element, corresponding to the second rotation angle, and outputting the second rotation angle as a confirmed rotation angle in response to a second difference value between the second magnetic value and the second measured magnetic value becoming less than a delta value.