Hall Sensor Signal Delay Correction for Air Compressor Motors
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Solution Overview
Problem
High-speed operation of air compressor motors using Hall sensors leads to signal delay errors due to manufacturing deviations and filter component errors, affecting speed precision and stability in fuel cell vehicle applications.
Innovation Solution
A method to correct signal delays in Hall sensors by calculating an offset angle and delay time using zero current control, applying these corrections to q-axis and d-axis voltages, and iteratively adjusting until the corrected voltages fall within a reference error range, thereby compensating for measurement delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a Hall sensor is used instead of a resolver for high-speed motor control, then cost is reduced, but signal delay errors increase due to manufacturing deviations and filter component errors
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values for signal delay in a lookup table before motor operation. During high-speed operation, the corrected Hall sensor signals are obtained by indexing this pre-computed table, eliminating the need for real-time complex calculations and compensating for manufacturing deviations and filter delays
Solution Approach 2:
The patent changes parameters by introducing correction factors based on motor speed and load conditions. The correction values are derived from the relationship between motor parameters (speed, torque) and Hall sensor signal delays, allowing dynamic adjustment of signal timing to compensate for manufacturing variations
2Measurement precision
If signal delay correction is applied to improve speed precision, then speed control stability improves, but computational complexity increases
Solution Approach 1:
The patent reduces computational complexity during operation by pre-computing correction values and storing them in a lookup table. The real-time operation only requires table indexing and simple arithmetic, avoiding complex iterative calculations while maintaining high speed precision
Solution Approach 2:
The patent replaces complex real-time computational mechanisms with a simpler lookup table-based system. Instead of performing complex signal processing and iterative corrections during motor operation, the system uses pre-computed data structures that require minimal processing power
3Measurement precision
If manufacturing tolerances of passive elements and filter components are tightly controlled, then signal delay error decreases, but manufacturing cost increases
Solution Approach 1:
The patent converts the harmful effect of manufacturing tolerances into a beneficial correction mechanism. By characterizing the relationship between manufacturing variations and signal delay, the system pre-computes correction values that transform the problem of tolerance sensitivity into a solvable lookup operation
Solution Approach 2:
The patent changes the approach from controlling physical component parameters to adjusting signal processing parameters. Instead of tightening manufacturing tolerances of passive elements and filters, the system modifies the electrical signal parameters through correction factors derived from measured relationships
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 method improves speed and current control stability, reduces motor torque oscillation, minimizes position errors, and enhances fuel economy by reducing unnecessary current consumption and manufacturing deviations.
Implementation Method 1
a Hall sensor for detecting a position of the motor
Data Source
AI summary
A method of correcting a signal delay of a Hall sensor for an air compressor motor when the air compressor motor rotates at a high speed includes: a first step of calculating an offset angle θ from a voltage equation, to which a q-axis voltage and a d-axis voltage are applied, by performing zero current control when an inertia braking section occurs during an operation of the motor; a second step of calculating a reference offset angle θoffset of the Hall sensor and a delay time t by using an angular velocity ω at any two points in the inertia braking section by using the equation for calculating the offset angle θ; and a third step of calculating a corrected q-axis voltage and a corrected d-axis voltage through the zero current control corrected and comparing the corrected q-axis voltage and the corrected d-axis voltage with a reference error.