Phase Shift Compensation for Multi-Turn Magnetic Sensor Accuracy
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Solution Overview
Problem
Magnetic sensors used for measuring position, particularly in multi-turn applications, face errors due to phase shifts between multi-turn sensors and angle sensors, leading to discontinuities in rotational angle position data, caused by factors like hysteresis and unequal signal propagation delays.
Innovation Solution
A processing circuit is used to determine a phase shift correction based on outputs from both the multi-turn sensor and the angle sensor, applying adjustments such as adding or subtracting 360 degrees to the position information to align the data, ensuring continuous and accurate rotational angle position calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase shift correction is applied to align multi-turn sensor and angle sensor outputs, then measurement precision is improved, but device complexity increases due to additional processing circuit requirements
Solution Approach 1:
The processing circuit pre-determines the phase shift correction value by comparing outputs from the multi-turn sensor and angle sensor, then applies this correction in advance to align the signals before position calculation. This preliminary alignment prevents discontinuities in rotational angle position data without requiring complex real-time correction mechanisms.
2Measurement precision
If multiple sensors are used to cover multi-turn applications, then measurement precision is improved, but object-generated harmful factors worsen due to phase shift errors causing discontinuities
Solution Approach 1:
The processing circuit continuously monitors the outputs from both the multi-turn sensor and angle sensor, compares their phase relationships, and dynamically determines correction values to compensate for phase shifts. This feedback mechanism eliminates discontinuities in rotational angle position data by realigning sensor outputs based on their actual phase difference.
3Reliability
If phase shift correction processing is implemented, then reliability is improved by providing continuous position data, but loss of time increases due to additional signal processing requirements
Solution Approach 1:
The processing circuit determines the phase shift correction value in advance by analyzing the phase relationship between sensor outputs, then applies this pre-calculated correction to align signals before position computation. This approach ensures continuous reliable position data while minimizing processing time by avoiding iterative real-time correction.
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 effectively compensates for phase shift errors, providing continuous and accurate rotational angle position data by aligning the outputs of multi-turn and angle sensors, thereby improving the reliability of position measurement systems.
Implementation Method 1
Magnetic sensors can include giant magnetoresistance (GMR) resistors made with alternating ferromagnetic alloy layers and non-magnetic layers. The resistance of the GMR resistor can be sensitive to and varies with changes in an applied magnetic field.
Implementation Method 2
The multi-turn sensor can be a giant magnetoresistive sensor, and the angle sensor can comprise an anisotropic magnetoresistive sensor.
Implementation Method 3
Sensor related errors can include intrinsic nonlinearities in the GMR resistor and/or hysteresis.
Data Source
AI summary
Aspects of the present disclosure relate to correcting for a phase shift between signals associated with an angle sensor and a multi-turn sensor that includes magnetoresistive elements. A processing circuit can determine a phase shift correction and generate position information based on at least the phase shift correction and a signal associated with the multi-turn sensor.