Speed Sensor Phase Lead Filtering for Signal Lag Compensation
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Solution Overview
Problem
Differential magnetic field sensors are orientation-dependent, leading to reduced performance due to misalignment between sensing elements and the target profile, which affects peak-to-peak differential signal amplitude and maximum air gap range.
Innovation Solution
A speed sensor device that processes sine and cosine signals with a phase lead filter to reduce the phase lag in the processing of the phase lead circuit, which includes a phase lead filter to reduce the phase lead in the processing of the phase lag in the processing of the phase lead filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If differential magnetic field sensing elements are used to cancel stray magnetic fields and improve measurement precision, then the sensor becomes orientation dependent and requires precise alignment with the target profile, but misalignment reduces the peak-to-peak differential signal and performance
Solution Approach 1:
The patent employs multiple sensing elements (first and second differential magnetic field sensing elements) arranged at different orientations to detect magnetic fields from the target. This multi-functional arrangement allows the sensor to maintain measurement precision across different orientations, effectively resolving the orientation dependency issue while preserving the ability to cancel stray magnetic fields.
Solution Approach 2:
The patent transitions from a single sensing element to multiple sensing elements arranged in different spatial dimensions (orientations). By adding this dimensional aspect, the system can detect magnetic field variations from multiple angles simultaneously, eliminating the need for precise alignment while maintaining measurement accuracy and the stray field cancellation capability.
2Productivity
If signal processing circuits are used to process sine and cosine signals, then the circuit introduces phase lag in the processed signals, but this phase lag reduces the accuracy of speed and position measurements
Solution Approach 1:
The patent applies a phase lead filter to the processed sine and cosine signals to compensate for the phase lag introduced by the signal processing circuit. This preliminary correction action anticipates and counteracts the phase delay, ensuring that the final output signals maintain accurate phase relationships for precise speed and position measurements.
Solution Approach 2:
The patent implements a feedback mechanism where the phase lag introduced by the signal processing circuit is measured and compensated for using a phase lead filter. This feedback loop continuously corrects the phase error, maintaining measurement precision despite the presence of signal processing circuits.
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 phase lead filter reduces the phase lag in the phase lag in the processing of the phase lag in the processing of the phase lag in the processing of the phase lead filter.
Implementation Method 1
magnetic field sensing elements to sense an angle of a moving target
Implementation Method 2
a phase lead filter to reduce the phase lag in the processed sine and cosine signals
Data Source
AI summary
A speed sensor device includes sensing elements to sense an angle of a moving target and to generate sine and cosine signals in response thereto; a signal condition circuit to process the sine and cosine signals, the processed sine and cosine signals having a phase lag introduced by the signal condition circuit; and a phase lead filter to receive the processed sine and cosine signals and to reduce the phase lag in the processed sine and cosine signals.