Inductive Rotor Position Signal Conditioning Without Phase Delay

The patent extracts the quadrature error component from the measurement signal through mathematical decomposition rather than physical filtering. By separating the in-phase and quadrature components using trigonometric relationships, the harmful quadrature error is isolated and eliminated without introducing phase delay, thus resolving the contradiction between measurement precision and time loss.

The patent replaces the mechanical/physical low-pass filter with a mathematical signal processing approach. Instead of using analog filtering hardware that inherently introduces phase delay, the solution uses digital signal processing techniques (trigonometric decomposition and calculation) to achieve quadrature error elimination without the temporal penalties of physical filtering.

The patent extracts only the harmful quadrature error component while preserving the useful position information. Through trigonometric decomposition, the measurement signal is separated into in-phase and quadrature components, allowing selective elimination of the quadrature error without discarding the position-containing in-phase component, thus avoiding information loss.

The patent segments the measurement signal into distinct components (in-phase and quadrature) that can be processed independently. This segmentation allows the quadrature error to be identified and removed while the position information in the in-phase component is preserved and used for accurate rotor position determination.

The patent converts the harmful phase shift caused by parasitic resistive elements into a manageable parameter. By explicitly calculating and compensating for the phase shift through trigonometric relationships, the solution transforms the adverse effect into a correctable factor, maintaining simple sensor hardware while achieving precise position determination.

The patent changes the approach from trying to eliminate parasitic resistance to working with its effects. By introducing phase shift compensation as a calculated parameter and using trigonometric decomposition, the system adapts to the presence of parasitic elements rather than attempting to remove them, preserving device simplicity while restoring measurement precision.