| 摘要 |
PROBLEM TO BE SOLVED: To accurately detect the rotation angle of a rotor based on the modulation signal obtained by detecting a resolver output. SOLUTION: A rotation angle measuring device selects a modulation signal with larger absolute value of variation rate at the measuring time among sine modulation signal and cosine modulation signal taken out of the output signal of resolver by detection. To the selected modulation signal with a value V, a reverse function operation is conducted to obtain a rotation angleθ. For example, when a sine modulation signal is selected,θis determined byθ=sin-1V.
|
