ENCODER SIGNAL ANALYSIS SYSTEM FOR HIGH-RESOLUTION POSITION MEASUREMENT
摘要
An apparatus and method for identifying the position of a magnetic shaft are provided. N field sensors are adjacently positioned at fixed locations relative to the shaft's periodic field, corresponding to 180/N relative phase shifts. A table provides N>2 predetermined signal models and a pre-identified position associated with each. An interpolator compares a representation of the N measured sensor signals to at least two predetermined models to generate a correction signal that provides another pre-identified position. The correction signal depends on N sensors for every position of the shaft. The correction signal is used to incrementally choose said another pre-identified position from the table as an approximate position of the shaft in an iterative process to find the minimum correction signal and identify the position.
申请公布号
CA2641407(C)
申请公布日期
2013.12.17
申请号
CA20072641407
申请日期
2007.02.05
申请人
CALIFORNIA LINEAR DEVICES, INC.
发明人
LINDBERG, PAUL M.;SCHULTZE, GARY;HOLLINGSWORTH, PHILIP