Encoder output signal correction apparatus and method

Details Encoder output signal correction apparatus and method Encoder output signal correction apparatus and method

2007-07-31

2007-07-31

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Phase or time of phase change

Synchro or resolver signal

C341S155000

Reexamination Certificate

active

11248365

ABSTRACT:
An offset error, an amplitude error, a phase error and a third harmonic component contained in two-phase sinusoidal signals are removed using relatively simple digital computations. An offset error contained in two-phase sinusoidal signals with a phase difference output from an encoder is detected and corrected. Then, an amplitude error contained in the offset-corrected two-phase sinusoidal signals is detected and corrected. Subsequently, a phase error contained in the amplitude-corrected two-phase sinusoidal signals is detected and corrected. Further, a third harmonic distortion contained in the phase-corrected two-phase sinusoidal signals is detected and corrected. Each correction step includes detecting an error from an ideal Lissajous waveform contained in the corrected two-phase sinusoidal signals, and adding the detected error to an accumulatively added last value to yield a new correction coefficient, thereby dynamically updating the correction coefficient.

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