| 摘要 |
PROBLEM TO BE SOLVED: To provide a method capable of dispensing with selection of magnetic field detecting elements and a temperature detection device, and reducing calculation errors of the rotation angle of a magnetic encoder caused by variations in temperature. SOLUTION: At least two output signals V<SB>a</SB>, V<SB>b</SB>are obtained from magnetic field detecting elements (ST1), and operation for performing normalization of amplitudes and phase correction is performed (ST2). Using the phase-corrected output signals, operation of R=(V<SB>a</SB><SP>2</SP>+V<SB>b</SB><SP>2</SP>)<SP>1/2</SP>is performed (ST3), and using the R value obtained from the operation a temperature is estimated based on a comparison table of temperature values with respect to prestored R values (ST4). Using the estimated temperature, a corrected offset value is estimated based on a comparison table of corrected offset values of the output signals with respect to prestored temperature values (ST5), and operation for adding the estimated corrected offset value to the phase-corrected output signals is performed (ST6). Using the output signals to which the estimated corrected offset value is added, a rotation angle is calculated (ST7). COPYRIGHT: (C)2005,JPO&NCIPI
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